/* ============================================================
   Koder Nexus — Autonomous Systems Lab
   Adaptive Identity Modes Design System
   One site, three presentation presets: PRO / TACTICAL / GAMER
   ============================================================ */

/* ─── Self-hosted Fonts ────────────────────────────────────── */

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/assets/fonts/Inter-Regular.woff2") format("woff2");
}

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("/assets/fonts/Inter-Medium.woff2") format("woff2");
}

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("/assets/fonts/Inter-SemiBold.woff2") format("woff2");
}

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("/assets/fonts/Inter-Bold.woff2") format("woff2");
}

@font-face {
  font-family: "Inter Tight";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("/assets/fonts/InterTight-Variable.woff2") format("woff2-variations");
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/assets/fonts/JetBrainsMono-Regular.woff2") format("woff2");
}

/* Barlow Condensed — pravi condensed display font */
@font-face {
  font-family: "Barlow Condensed";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("/assets/fonts/BarlowCondensed-SemiBold.woff2") format("woff2");
}
@font-face {
  font-family: "Barlow Condensed";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("/assets/fonts/BarlowCondensed-Bold.woff2") format("woff2");
}
@font-face {
  font-family: "Barlow Condensed";
  font-style: normal;
  font-weight: 800;
  font-display: swap;
  src: url("/assets/fonts/BarlowCondensed-ExtraBold.woff2") format("woff2");
}
@font-face {
  font-family: "Barlow Condensed";
  font-style: normal;
  font-weight: 900;
  font-display: swap;
  src: url("/assets/fonts/BarlowCondensed-Black.woff2") format("woff2");
}

/* ─── Design Tokens — PROFESSIONAL (Default Mode) ──────────── */
/* Clean, premium, balanced. Default for broad serious audience. */

:root {
  /* Professional dark (default) */
  --bg: #0F1115;
  --bg-elevated: #161A20;
  --bg-subtle: #1C2128;
  --bg-grid: rgba(255, 255, 255, 0.02);
  --bg-scanline: rgba(0, 163, 255, 0.012);

  --fg: #F0F2F5;
  --fg-muted: #8A8F98;
  --fg-subtle: #5A5F68;

  --accent: #00A3FF;
  --accent-hover: #33B8FF;
  --accent-dim: rgba(0, 163, 255, 0.15);

  --ember: #FF6B35;
  --ember-hover: #FF8555;
  --ember-dim: rgba(255, 107, 53, 0.12);
  --energy: #FF6B35;
  --energy-dim: rgba(255, 107, 53, 0.12);

  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.12);
  --border-tactical: rgba(0, 163, 255, 0.20);

  --success: #22C55E;
  --warning: #FF6B35;
  --danger: #EF4444;

  /* Typography */
  --font-display: "Barlow Condensed", "Inter Tight", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-prose: 720px;
  --radius: 4px;
  --radius-sm: 2px;
  --radius-full: 9999px;

  /* Motion — Professional: moderate, precise */
  --ease-tactical: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-sharp: cubic-bezier(0.16, 1, 0.3, 1);
  --duration: 200ms;
  --duration-fast: 120ms;
  --motion-intensity: 1;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.5);

  /* Hero glow intensity */
  --hero-glow-opacity: 0.6;
}

/* ─── TACTICAL Mode — Dark command surface, elite systems ─── */
/* Strongest brand expression. Darker, more precise, more tactical. */

[data-mode="tactical"] {
  --bg: #0A0C10;
  --bg-elevated: #11151B;
  --bg-subtle: #181D24;
  --bg-grid: rgba(0, 200, 255, 0.03);
  --bg-scanline: rgba(0, 200, 255, 0.025);

  --fg: #E8ECF0;
  --fg-muted: #7A8088;
  --fg-subtle: #4A5058;

  --accent: #00C8FF;
  --accent-hover: #40D8FF;
  --accent-dim: rgba(0, 200, 255, 0.18);

  --energy: #00C8FF;
  --energy-dim: rgba(0, 200, 255, 0.15);

  --border: rgba(0, 200, 255, 0.06);
  --border-strong: rgba(0, 200, 255, 0.15);
  --border-tactical: rgba(0, 200, 255, 0.30);

  --hero-glow-opacity: 0.8;
  --motion-intensity: 1;
}

/* ─── GAMER Mode — High-energy, bolder, still disciplined ──── */
/* Precision blue stays canonical primary. Ember orange = secondary energy accent. */
/* Differentiates through: motion intensity, warmer texture, bolder typography. */

[data-mode="gamer"] {
  --bg: #0C0E14;
  --bg-elevated: #141821;
  --bg-subtle: #1C2230;
  --bg-grid: rgba(0, 163, 255, 0.025);
  --bg-scanline: rgba(255, 107, 53, 0.012);

  --fg: #F5F7FA;
  --fg-muted: #9098A8;
  --fg-subtle: #5A6270;

  /* Precision blue stays primary — brand DNA unchanged */
  --accent: #00A3FF;
  --accent-hover: #33B8FF;
  --accent-dim: rgba(0, 163, 255, 0.18);

  /* Ember orange = secondary energy accent for micro-states, highlights, selected details */
  --ember: #FF6B35;
  --ember-hover: #FF8555;
  --ember-dim: rgba(255, 107, 53, 0.15);
  --energy: #FF6B35;
  --energy-dim: rgba(255, 107, 53, 0.12);

  --border: rgba(0, 163, 255, 0.08);
  --border-strong: rgba(0, 163, 255, 0.15);
  --border-tactical: rgba(0, 163, 255, 0.25);

  --hero-glow-opacity: 0.7;
  --motion-intensity: 1.3;
  --duration: 160ms;
  --duration-fast: 100ms;
}

/* ─── Light theme (Operations Daylight — applies to all modes) ── */
/* Steel/paper/graphite tonal balance. Serious, not CMS-white. */

[data-theme="light"] {
  --bg: #E8EBF0;
  --bg-elevated: #F5F7FA;
  --bg-subtle: #DDE1E8;
  --bg-grid: rgba(0, 0, 0, 0.025);
  --bg-scanline: rgba(0, 102, 255, 0.006);

  --fg: #1A1D23;
  --fg-muted: #4A5058;
  --fg-subtle: #6A7078;

  --accent: #0066FF;
  --accent-hover: #0052CC;
  --accent-dim: rgba(0, 102, 255, 0.08);

  --ember: #D4501A;
  --ember-hover: #B8420F;
  --ember-dim: rgba(212, 80, 26, 0.08);

  --border: rgba(0, 0, 0, 0.06);
  --border-strong: rgba(0, 0, 0, 0.12);
  --border-tactical: rgba(0, 102, 255, 0.18);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.10);

  --hero-glow-opacity: 0.25;
}

[data-theme="light"][data-mode="tactical"] {
  --bg: #DDE1E8;
  --bg-elevated: #E8EBF0;
  --bg-subtle: #D1D5DC;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --border-tactical: rgba(0, 102, 255, 0.25);
  --hero-glow-opacity: 0.3;
}

[data-theme="light"][data-mode="gamer"] {
  --bg: #E0E3E9;
  --bg-elevated: #EDF0F4;
  --bg-subtle: #D5D9E0;
  --energy: #D4501A;
  --energy-dim: rgba(212, 80, 26, 0.08);
  --hero-glow-opacity: 0.28;
}

/* ─── Reset & Base ─────────────────────────────────────────── */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  color: var(--fg);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--duration) var(--ease-tactical),
              color var(--duration) var(--ease-tactical);
  background-image:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: -1px -1px;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent 0,
    transparent 2px,
    var(--bg-scanline) 2px,
    var(--bg-scanline) 3px
  );
  opacity: 0.5;
}

/* ─── Typography ───────────────────────────────────────────── */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--fg);
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.75rem, 6vw, 5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 0.95;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.0;
}

h3 {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
}

p {
  color: var(--fg-muted);
  line-height: 1.7;
}

.lead {
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--fg);
  max-width: var(--max-width-prose);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0;
  color: var(--fg-subtle);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--fg-subtle);
  font-weight: 400;
}

/* ─── Layout ───────────────────────────────────────────────── */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  position: relative;
  z-index: 1;
}

.container-prose {
  max-width: var(--max-width-prose);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  position: relative;
  z-index: 1;
}

.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

.section-header {
  margin-bottom: var(--space-xl);
}

.section-header .eyebrow {
  margin-bottom: var(--space-sm);
}

/* ─── Navigation ────────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--fg);
}

.nav-brand-logo {
  width: 28px;
  height: 28px;
  color: var(--accent);
  flex-shrink: 0;
  overflow: visible;
}

.nav-brand-logo .kn-orbit-outer,
.nav-brand-logo .kn-orbit-mid,
.nav-brand-logo .kn-orbit-inner {
  transform-box: fill-box;
  transform-origin: center;
}

.nav-brand-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  letter-spacing: 0;
  text-transform: uppercase;
}

.nav-brand-descriptor {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-subtle);
  margin-left: var(--space-xs);
  padding-left: var(--space-sm);
  border-left: 1px solid var(--border-strong);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color var(--duration-fast) var(--ease-tactical);
  position: relative;
}

.nav-links a:hover {
  color: var(--accent);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--accent);
  transition: width var(--duration-fast) var(--ease-tactical);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-lang {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.nav-lang a {
  color: var(--fg-subtle);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-tactical);
}

.nav-lang a.active {
  color: var(--accent);
}

.nav-lang a:hover {
  color: var(--fg);
}

.nav-lang span {
  color: var(--border-strong);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-strong);
  cursor: pointer;
  padding: var(--space-xs);
  color: var(--fg);
  border-radius: var(--radius-sm);
}

.nav-toggle-icon {
  width: 20px;
  height: 20px;
}

/* ─── Mode Switcher — Segmented Control ─────────────────────── */

.mode-switcher {
  display: flex;
  align-items: center;
  gap: 0;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.mode-switcher-btn {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-subtle);
  background: none;
  border: none;
  padding: 4px 8px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-tactical);
  white-space: nowrap;
  position: relative;
}

.mode-switcher-btn:hover {
  color: var(--fg);
}

.mode-switcher-btn.active {
  color: var(--accent);
  background-color: var(--accent-dim);
}

.mode-switcher-btn.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 4px;
  right: 4px;
  height: 1px;
  background-color: var(--accent);
}

.mode-switcher-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ─── Buttons — Tactical ────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-tactical);
  white-space: nowrap;
  position: relative;
}

.btn-primary {
  background-color: var(--accent);
  color: #0F1115;
  border-color: var(--accent);
}

[data-theme="light"] .btn-primary {
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 0 0 1px var(--accent-dim), 0 0 12px var(--accent-dim);
  transform: translateY(calc(-1px * var(--motion-intensity)));
}

.btn-secondary {
  background-color: transparent;
  color: var(--fg);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: var(--accent-dim);
}

/* ─── Hero — Cinematic Command Surface ──────────────────────── */

.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  position: relative;
  overflow: hidden;
  min-height: 70vh;
  display: flex;
  align-items: center;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  right: 0;
  bottom: 0;
  background: radial-gradient(
    ellipse at 70% 50%,
    var(--accent-dim) 0%,
    transparent 60%
  );
  opacity: var(--hero-glow-opacity);
  pointer-events: none;
}

.hero-inner {
  max-width: 800px;
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.hero-eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background-color: var(--accent);
}

.hero h1 {
  margin-bottom: var(--space-md);
  font-size: clamp(2.5rem, 7vw, 5.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 0.92;
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--fg);
  font-weight: 500;
  margin-bottom: var(--space-md);
  max-width: 620px;
  letter-spacing: -0.01em;
}

.hero-description {
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--fg-muted);
  margin-bottom: var(--space-xl);
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.hero-meta {
  display: flex;
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-meta-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-subtle);
}

.hero-meta-value {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--fg);
  font-weight: 500;
}

/* ─── Capability signal strip ──────────────────────────────── */

.capability-strip {
  padding: var(--space-md) 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background-color: var(--bg-elevated);
  text-align: center;
}

.capability-line {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  margin: 0;
  text-transform: uppercase;
}

.capability-line .sep {
  margin: 0 0.5rem;
  color: var(--accent);
  opacity: 0.6;
}

/* ─── Manifesto panel ─────────────────────────────────────── */

.manifesto {
  padding: var(--space-2xl) 0;
  text-align: center;
  position: relative;
}

.manifesto::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}

.manifesto-quote {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--fg);
  max-width: 42rem;
  margin: 0 auto;
  border: none;
  padding: var(--space-xl) var(--space-lg);
  background-color: var(--bg);
  position: relative;
  letter-spacing: -0.01em;
  text-transform: uppercase;
}

.manifesto-quote::before,
.manifesto-quote::after {
  content: none;
}

/* ─── System map ──────────────────────────────────────────── */

.system-map-section {
  padding: var(--space-2xl) 0;
}

.system-map {
  max-width: 600px;
  margin: 0 auto var(--space-lg);
}

.system-map-svg {
  width: 100%;
  height: auto;
}

.system-markers {
  list-style: none;
  padding: 0;
  margin: var(--space-lg) auto 0;
  max-width: 36rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

.system-markers li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-muted);
  padding-left: 1.25rem;
  position: relative;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.system-markers li::before {
  content: "\25B8";
  position: absolute;
  left: 0;
  color: var(--accent);
}

@media (max-width: 768px) {
  .system-markers {
    grid-template-columns: 1fr;
  }
}

/* ─── Tactical Panels ──────────────────────────────────────── */

.grid {
  display: grid;
  gap: var(--space-md);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.panel {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: border-color var(--duration-fast) var(--ease-tactical),
              background-color var(--duration-fast) var(--ease-tactical);
  position: relative;
}

.panel:hover {
  border-color: var(--border-tactical);
  background-color: var(--bg-subtle);
}

.panel::before,
.panel::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  border-color: var(--border-strong);
  border-style: solid;
  border-width: 0;
  opacity: 0.6;
  transition: border-color var(--duration-fast) var(--ease-tactical);
}

.panel::before {
  top: -1px;
  left: -1px;
  border-top-width: 1px;
  border-left-width: 1px;
}

.panel::after {
  bottom: -1px;
  right: -1px;
  border-bottom-width: 1px;
  border-right-width: 1px;
}

.panel:hover::before,
.panel:hover::after {
  border-color: var(--accent);
  opacity: 1;
}

.panel-icon {
  width: 28px;
  height: 28px;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.panel h3 {
  margin-bottom: var(--space-sm);
  color: var(--fg);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
  font-size: 1.0625rem;
}

.panel p {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--fg-muted);
}

/* ─── Proof — Tactical ─────────────────────────────────────── */

.proof-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.proof-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--bg-elevated);
  transition: border-color var(--duration-fast) var(--ease-tactical);
  position: relative;
}

.proof-item:hover {
  border-color: var(--border-tactical);
}

.proof-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--space-lg);
  bottom: var(--space-lg);
  width: 2px;
  background-color: var(--border-strong);
  transition: background-color var(--duration-fast) var(--ease-tactical);
}

.proof-item:hover::before {
  background-color: var(--accent);
}

.proof-badge {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--accent-dim);
}

.proof-content h3 {
  margin-bottom: var(--space-xs);
  font-size: 1.0625rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.proof-content p {
  font-size: 0.875rem;
}

/* ─── Principles — Tactical ─────────────────────────────────── */

.principles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.principle {
  padding: var(--space-lg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--bg-elevated);
  transition: border-color var(--duration-fast) var(--ease-tactical);
}

.principle:hover {
  border-color: var(--border-tactical);
}

.principle h3 {
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  font-size: 1.0625rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.principle-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 400;
}

.principle p {
  font-size: 0.875rem;
  line-height: 1.7;
}

/* ─── Use Cases — Tactical ──────────────────────────────────── */

.usecase {
  padding: var(--space-lg);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--duration-fast) var(--ease-tactical);
  position: relative;
}

.usecase:hover {
  border-color: var(--border-tactical);
}

.usecase::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 24px;
  height: 1px;
  background-color: var(--accent);
}

.usecase h3 {
  margin-bottom: var(--space-sm);
  font-size: 1.0625rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.usecase p {
  font-size: 0.875rem;
}

/* ─── Contact ───────────────────────────────────────────────── */

.contact {
  text-align: center;
  padding: var(--space-3xl) 0;
}

.contact h2 {
  margin-bottom: var(--space-md);
}

.contact p {
  font-size: 1.125rem;
  margin-bottom: var(--space-xl);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.contact-email {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--fg-muted);
  margin-top: var(--space-lg);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-tactical);
}

.contact-email:hover {
  color: var(--accent);
}

/* ─── Footer ────────────────────────────────────────────────── */

.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-2xl) 0;
  background-color: var(--bg-elevated);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-xl);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.footer-brand-descriptor {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--fg-subtle);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.footer-links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
}

.footer-links a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color var(--duration-fast) var(--ease-tactical);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-subtle);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border);
}

/* ─── Theme Toggle ──────────────────────────────────────────── */

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: none;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--fg-muted);
  transition: all var(--duration-fast) var(--ease-tactical);
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

.theme-toggle .sun { display: none; }
.theme-toggle .moon { display: block; }

[data-theme="light"] .theme-toggle .sun { display: block; }
[data-theme="light"] .theme-toggle .moon { display: none; }

/* ─── Scroll Reveal ─────────────────────────────────────────── */

.reveal {
  opacity: 0;
  transform: translateY(calc(12px * var(--motion-intensity)));
  transition: opacity var(--duration) var(--ease-sharp),
              transform var(--duration) var(--ease-sharp);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Responsive ────────────────────────────────────────────── */

@media (max-width: 768px) {
  .container { padding: 0 var(--space-md); }
  .container-prose { padding: 0 var(--space-md); }
  .section { padding: var(--space-2xl) 0; }

  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: var(--space-lg);
    gap: var(--space-md);
  }
  .nav-toggle { display: flex; }

  .nav-brand-descriptor { display: none; }
  .mode-switcher {
    display: flex;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .mode-switcher::-webkit-scrollbar { display: none; }

  .grid-2, .grid-4, .proof-grid, .principles-grid {
    grid-template-columns: 1fr;
  }

  .hero { padding: var(--space-2xl) 0; min-height: auto; }
  .hero h1 { font-size: clamp(2rem, 8vw, 3.5rem); }
  [data-mode="gamer"] .hero h1 { line-height: 1.0; text-shadow: 0 0 12px rgba(0, 163, 255, 0.06); }
  .hero-subtitle { font-size: 1.125rem; }
  .hero-description { font-size: 1rem; }
  .hero-meta { gap: var(--space-md); }

  .footer-inner { flex-direction: column; }
  .footer-links { flex-wrap: wrap; gap: var(--space-md); }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}

/* ─── Reduced Motion ────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
  body::before { display: none; }
}

/* ─── Selection ─────────────────────────────────────────────── */

::selection {
  background-color: var(--accent);
  color: var(--bg);
}

/* ─── Focus ─────────────────────────────────────────────────── */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ─── Scrollbar ─────────────────────────────────────────────── */

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 0; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ─── Skip link ─────────────────────────────────────────────── */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   PHASE 3C — Presentation Excellence Additions
   ============================================================ */

/* ─── Hero System Field — Animated Visual ──────────────────── */

.hero-field {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.hero-field-svg {
  width: 100%;
  height: 100%;
  opacity: 0.7;
}

.hero-field-svg .sf-node {
  fill: var(--accent);
  opacity: 0.6;
  animation: sf-pulse 4s ease-in-out infinite;
}

.hero-field-svg .sf-node:nth-child(2n) { animation-delay: -1s; }
.hero-field-svg .sf-node:nth-child(3n) { animation-delay: -2s; }
.hero-field-svg .sf-node:nth-child(5n) { animation-delay: -3s; }

.hero-field-svg .sf-link {
  stroke: var(--accent);
  stroke-width: 0.5;
  opacity: 0.15;
  animation: sf-trace 6s ease-in-out infinite;
}

.hero-field-svg .sf-link:nth-child(2n) { animation-delay: -2s; }
.hero-field-svg .sf-link:nth-child(3n) { animation-delay: -4s; }

.hero-field-svg .sf-ring {
  fill: none;
  stroke: var(--accent);
  stroke-width: 0.3;
  opacity: 0.08;
  animation: sf-drift 20s linear infinite;
}

@keyframes sf-pulse {
  0%, 100% { opacity: 0.3; r: 2; }
  50% { opacity: 0.8; r: 3; }
}

@keyframes sf-trace {
  0%, 100% { opacity: 0.08; stroke-dasharray: 0 100; }
  50% { opacity: 0.25; stroke-dasharray: 100 0; }
}

@keyframes sf-drift {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@media (max-width: 768px) {
  .hero-field { display: none; }
}

/* ─── Animated Section Separators ──────────────────────────── */

.section-separator {
  position: relative;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
  margin: 0;
  overflow: hidden;
}

.section-separator::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: sep-sweep 8s ease-in-out infinite;
  opacity: 0.4;
}

@keyframes sep-sweep {
  0% { left: -100%; }
  50% { left: 100%; }
  100% { left: 100%; }
}

/* ─── Staggered Reveal Choreography ────────────────────────── */

.reveal[data-stagger="1"] { transition-delay: 0ms; }
.reveal[data-stagger="2"] { transition-delay: 80ms; }
.reveal[data-stagger="3"] { transition-delay: 160ms; }
.reveal[data-stagger="4"] { transition-delay: 240ms; }
.reveal[data-stagger="5"] { transition-delay: 320ms; }
.reveal[data-stagger="6"] { transition-delay: 400ms; }

/* ─── Enhanced Panel Hover — Layered Effects ───────────────── */

.panel {
  overflow: hidden;
}

.panel::after {
  content: "";
  position: absolute;
  top: 0;
  right: -1px;
  width: 0;
  height: 100%;
  border-right: 2px solid var(--accent);
  opacity: 0;
  transition: width var(--duration-fast) var(--ease-tactical),
              opacity var(--duration-fast) var(--ease-tactical);
}

.panel:hover::after {
  width: 2px;
  opacity: 0.6;
}

/* ─── Capability Map — Operational System Diagram ──────────── */

.capability-map {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  position: relative;
}

.capability-node {
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: all var(--duration-fast) var(--ease-tactical);
  position: relative;
}

.capability-node:hover {
  border-color: var(--border-tactical);
  background-color: var(--bg-subtle);
  transform: translateY(calc(-2px * var(--motion-intensity)));
}

.capability-node-status {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: 6px;
}

.capability-node-status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent);
  animation: status-blink 3s ease-in-out infinite;
}

@keyframes status-blink {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

.capability-node h3 {
  margin-bottom: var(--space-sm);
  font-size: 1.0625rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.capability-node p {
  font-size: 0.8125rem;
  line-height: 1.6;
}

.capability-node-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: var(--space-md);
}

.capability-tag {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-subtle);
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

@media (max-width: 768px) {
  .capability-map { grid-template-columns: 1fr; }
}

/* ─── Operational Matrix — Proof Without Fake Proof ────────── */

.opmatrix {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background-color: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.opmatrix-cell {
  background-color: var(--bg-elevated);
  padding: var(--space-lg);
  transition: background-color var(--duration-fast) var(--ease-tactical);
  position: relative;
}

.opmatrix-cell:hover {
  background-color: var(--bg-subtle);
}

.opmatrix-cell-label {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-subtle);
  margin-bottom: var(--space-xs);
}

.opmatrix-cell h3 {
  margin-bottom: var(--space-sm);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.opmatrix-cell p {
  font-size: 0.8125rem;
  line-height: 1.6;
}

.opmatrix-cell::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 24px;
  height: 1px;
  background-color: var(--accent);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-tactical);
}

.opmatrix-cell:hover::before {
  opacity: 1;
}

@media (max-width: 768px) {
  .opmatrix { grid-template-columns: 1fr; }
}

/* ─── Nexus Prime Ecosystem Signal ─────────────────────────── */

.ecosystem-signal {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-subtle);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}

.ecosystem-signal a {
  color: var(--fg-muted);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-tactical);
}

.ecosystem-signal a:hover {
  color: var(--accent);
}

/* ─── Hero CTA Polish ──────────────────────────────────────── */

.hero-actions .btn-primary {
  position: relative;
  overflow: hidden;
}

.hero-actions .btn-primary::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transition: left 0.6s var(--ease-sharp);
}

.hero-actions .btn-primary:hover::before {
  left: 100%;
}

/* ─── Vision Page — Ecosystem Sentence ─────────────────────── */

.vision-ecosystem {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
}

.vision-ecosystem p {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--fg-muted);
  max-width: var(--max-width-prose);
}

.vision-ecosystem .eyebrow {
  margin-bottom: var(--space-sm);
}

/* ─── Ambient Field Drift (subtle background motion) ───────── */

.hero::after {
  content: "";
  position: absolute;
  top: 20%;
  right: 10%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-dim) 0%, transparent 70%);
  opacity: 0.3;
  animation: ambient-drift 15s ease-in-out infinite;
  pointer-events: none;
}

@keyframes ambient-drift {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.2; }
  33% { transform: translate(30px, -20px) scale(1.1); opacity: 0.3; }
  66% { transform: translate(-20px, 30px) scale(0.9); opacity: 0.25; }
}

/* ─── Reduced Motion — Disable all 3C/3D animations ────────── */

@media (prefers-reduced-motion: reduce) {
  .hero-field-svg .sf-node,
  .hero-field-svg .sf-link,
  .hero-field-svg .sf-ring,
  .section-separator::after,
  .capability-node-status::before,
  .hero::after,
  .signature-line::after,
  .section-anchor::before {
    animation: none !important;
  }
  .hero-actions .btn-primary::before { display: none; }
  .reveal[data-stagger] { transition-delay: 0ms !important; }
}

/* ============================================================
   PHASE 3D — Art Direction Refinement
   Less UI, more presence. Premium command-surface identity.
   ============================================================ */

/* ─── Hero Gravitas — Signature Statement ──────────────────── */

.hero {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
  position: relative;
  overflow: hidden;
}

.hero-inner {
  max-width: var(--max-width-prose);
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  letter-spacing: 0.18em;
  margin-bottom: var(--space-lg);
  font-size: 0.6875rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.75rem, 7vw, 5rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--fg);
  max-width: 540px;
  margin-bottom: var(--space-md);
  font-weight: 500;
}

.hero-description {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--fg-muted);
  max-width: 480px;
  margin-bottom: var(--space-xl);
}

.hero-meta {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border);
}

/* ─── Mode Atmosphere Differentiation ──────────────────────── */

/* Tactical: tighter grid, stronger scanline, more precise feel */
[data-mode="tactical"] body {
  background-size: 36px 36px;
}
[data-mode="tactical"] body::before {
  opacity: 1.5;
}
[data-mode="tactical"] .panel {
  border-radius: var(--radius-sm);
}

/* Gamer: warmer texture, bolder type, energy accents on hover */
[data-mode="gamer"] body {
  background-size: 52px 52px;
}
[data-mode="gamer"] .capability-node:hover .capability-node-status::before {
  background-color: var(--energy);
}
[data-mode="gamer"] .capability-node:hover .capability-node-status {
  color: var(--energy);
}
[data-mode="gamer"] .opmatrix-cell:hover::before {
  background-color: var(--energy);
}

/* ─── Light Mode Maturity — Operations Daylight ────────────── */

[data-theme="light"] body {
  background-image:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 48px 48px;
}

[data-theme="light"] .hero-field-svg {
  opacity: 0.3;
}

[data-theme="light"] .hero-field-svg .sf-ring {
  opacity: 0.04;
  stroke: var(--accent);
}

[data-theme="light"] .hero-field-svg .sf-link {
  opacity: 0.06;
  stroke: var(--accent);
}

[data-theme="light"] .hero-field-svg .sf-node {
  opacity: 0.25;
  fill: var(--accent);
}

[data-theme="light"] .hero::after {
  opacity: 0.15;
}

[data-theme="light"] .panel {
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .capability-node {
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .opmatrix-cell {
  box-shadow: var(--shadow-sm);
}

/* ─── Signature Details ────────────────────────────────────── */

/* 1. Section anchor — asymmetric technical mark */
.section-anchor {
  position: relative;
  padding-left: 20px;
}

.section-anchor::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 12px;
  height: 1px;
  background-color: var(--accent);
  animation: anchor-activate 0.8s var(--ease-sharp) forwards;
}

@keyframes anchor-activate {
  from { width: 0; }
  to { width: 12px; }
}

/* 2. Technical caption style for section labels */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--fg-subtle);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.eyebrow::before {
  content: "\2014";
  color: var(--accent);
  font-family: var(--font-mono);
}

/* 3. Signature line — animated activation on reveal */
.signature-line {
  position: relative;
  width: 100%;
  height: 1px;
  background-color: var(--border);
  margin: var(--space-xl) 0;
  overflow: hidden;
}

.signature-line::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--accent);
  animation: sig-draw 1.2s var(--ease-sharp) 0.3s forwards;
}

@keyframes sig-draw {
  from { width: 0; }
  to { width: 100%; }
}

/* 4. Corner marks on key panels — refined */
.capability-node::before,
.capability-node::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  border-color: var(--border-tactical);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-tactical);
}

.capability-node::before {
  top: 0;
  left: 0;
  border-top: 1px solid;
  border-left: 1px solid;
}

.capability-node::after {
  bottom: 0;
  right: 0;
  border-bottom: 1px solid;
  border-right: 1px solid;
}

.capability-node:hover::before,
.capability-node:hover::after {
  opacity: 1;
}

/* ─── Content Tone Polish — Typography Refinement ──────────── */

.section-header h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  text-transform: uppercase;
}

.manifesto-quote {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  line-height: 1.25;
  letter-spacing: -0.005em;
  text-transform: none;
}

/* ─── Gamer Mode — Energy Accent on Micro-States ───────────── */

[data-mode="gamer"] .btn-primary:focus-visible {
  outline-color: var(--energy);
}

[data-mode="gamer"] .nav-brand-logo:focus-visible {
  outline-color: var(--energy);
}

[data-mode="gamer"] .mode-switcher-btn.active {
  background-color: var(--accent);
  color: var(--bg);
}

[data-mode="gamer"] .mode-switcher-btn.active::after {
  background-color: var(--energy);
}

/* ─── Tactical Mode — Precision Details ────────────────────── */

[data-mode="tactical"] .capability-node-status {
  letter-spacing: 0.15em;
}

[data-mode="tactical"] .opmatrix-cell-label {
  letter-spacing: 0.15em;
}

[data-mode="tactical"] .section-header h2 {
  letter-spacing: -0.015em;
}

/* ============================================================
   PHASE 3G — Adaptive Mode Differentiation Upgrade
   Three genuine presentation states, not just color swaps.
   Preview-only. Production baseline locked.
   ============================================================ */

/* ─── PROFESSIONAL — Calm control. Clear systems. ──────────── */

[data-mode="professional"] .hero {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
}

[data-mode="professional"] .hero h1 {
  font-weight: 700;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  letter-spacing: -0.01em;
  line-height: 1.0;
  max-width: 900px;
}

[data-mode="professional"] .hero-subtitle {
  font-weight: 400;
  font-size: 1.1875rem;
  max-width: 580px;
}

[data-mode="professional"] .hero-description {
  max-width: 500px;
}

[data-mode="professional"] .hero-field-svg {
  opacity: 0.35;
}

[data-mode="professional"] .hero-field-svg .sf-node {
  opacity: 0.3;
  r: 3;
}

[data-mode="professional"] .hero-field-svg .sf-link {
  opacity: 0.08;
  stroke-width: 0.25;
}

[data-mode="professional"] .hero-field-svg .sf-ring {
  opacity: 0.04;
}

[data-mode="professional"] .capability-node {
  border-radius: var(--radius);
  border-width: 1px;
  padding: var(--space-lg);
}

[data-mode="professional"] .capability-node::before,
[data-mode="professional"] .capability-node::after {
  display: none;
}

[data-mode="professional"] .opmatrix-cell {
  border-radius: var(--radius);
  padding: var(--space-lg);
}

[data-mode="professional"] .section-header {
  margin-bottom: var(--space-xl);
}

[data-mode="professional"] .section-anchor::before {
  width: 8px;
}

[data-mode="professional"] .eyebrow {
  letter-spacing: 0.18em;
  font-size: 0.6875rem;
}

[data-mode="professional"] .section-separator::after {
  background: linear-gradient(90deg, transparent, var(--accent-dim), transparent);
}

/* Professional motion — slowest, almost invisible */
[data-mode="professional"] {
  --duration: 300ms;
  --duration-fast: 180ms;
  --motion-intensity: 0.7;
}

[data-mode="professional"] .reveal {
  transition: opacity 600ms ease, transform 600ms ease;
}

[data-mode="professional"] .hero-field-svg .sf-node {
  animation-duration: 4s;
}

[data-mode="professional"] .hero-field-svg .sf-link {
  animation-duration: 6s;
}

[data-mode="professional"] .hero-field-svg .sf-ring {
  animation-duration: 20s;
}

/* ─── TACTICAL — Operational clarity under pressure. ───────── */

[data-mode="tactical"] .hero {
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

[data-mode="tactical"] .hero h1 {
  font-weight: 800;
  font-size: clamp(2.75rem, 7vw, 5rem);
  letter-spacing: -0.02em;
  line-height: 0.92;
  max-width: 800px;
}

[data-mode="tactical"] .hero-subtitle {
  font-weight: 600;
  font-size: 1.25rem;
  max-width: 520px;
}

[data-mode="tactical"] .hero-description {
  max-width: 460px;
}

[data-mode="tactical"] .hero-field-svg {
  opacity: 0.65;
}

[data-mode="tactical"] .hero-field-svg .sf-node {
  opacity: 0.5;
  r: 2.5;
}

[data-mode="tactical"] .hero-field-svg .sf-link {
  opacity: 0.15;
  stroke-width: 0.4;
}

[data-mode="tactical"] .hero-field-svg .sf-ring {
  opacity: 0.1;
}

[data-mode="tactical"] .capability-node {
  border-radius: var(--radius-sm);
  border-width: 1px;
  padding: var(--space-md);
  border-color: var(--border-tactical);
}

[data-mode="tactical"] .capability-node::before,
[data-mode="tactical"] .capability-node::after {
  opacity: 0.4;
  width: 10px;
  height: 10px;
  border-color: var(--accent);
}

[data-mode="tactical"] .opmatrix-cell {
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  border-color: var(--border-tactical);
}

[data-mode="tactical"] .section-header {
  margin-bottom: var(--space-lg);
}

[data-mode="tactical"] .section-anchor::before {
  width: 16px;
  background-color: var(--accent);
}

[data-mode="tactical"] .eyebrow {
  letter-spacing: 0.15em;
  font-size: 0.625rem;
  color: var(--accent);
}

[data-mode="tactical"] .eyebrow::before {
  content: "\25B8";
  color: var(--accent);
}

[data-mode="tactical"] .section-separator::after {
  background: linear-gradient(90deg, transparent 5%, var(--accent) 50%, transparent 95%);
  height: 1px;
}

[data-mode="tactical"] .section-separator {
  height: 1px;
  background-color: var(--border-tactical);
}

/* Tactical motion — precise signal */
[data-mode="tactical"] {
  --duration: 200ms;
  --duration-fast: 120ms;
  --motion-intensity: 1.0;
}

[data-mode="tactical"] .reveal {
  transition: opacity 400ms var(--ease-sharp), transform 400ms var(--ease-sharp);
}

[data-mode="tactical"] .hero-field-svg .sf-node {
  animation-duration: 2.5s;
}

[data-mode="tactical"] .hero-field-svg .sf-link {
  animation-duration: 3s;
}

[data-mode="tactical"] .hero-field-svg .sf-ring {
  animation-duration: 12s;
}

[data-mode="tactical"] .capability-node:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

[data-mode="tactical"] .capability-node::before,
[data-mode="tactical"] .capability-node::after {
  transition: opacity var(--duration-fast) var(--ease-sharp);
}

[data-mode="tactical"] .capability-node:hover::before,
[data-mode="tactical"] .capability-node:hover::after {
  opacity: 1;
}

/* ─── GAMER — High-performance systems. No spectator mode. ─── */

[data-mode="gamer"] .hero {
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-3xl);
}

[data-mode="gamer"] .hero h1 {
  font-weight: 900;
  font-size: clamp(3rem, 8vw, 5.5rem);
  letter-spacing: -0.025em;
  line-height: 0.96;
  max-width: 750px;
  text-shadow: 0 0 16px rgba(0, 163, 255, 0.08);
}

[data-mode="gamer"] .hero-subtitle {
  font-weight: 600;
  font-size: 1.3125rem;
  max-width: 500px;
}

[data-mode="gamer"] .hero-description {
  max-width: 440px;
}

[data-mode="gamer"] .hero-field-svg {
  opacity: 0.5;
}

[data-mode="gamer"] .hero-field-svg .sf-node {
  opacity: 0.5;
  r: 3.5;
}

[data-mode="gamer"] .hero-field-svg .sf-link {
  opacity: 0.12;
  stroke-width: 0.35;
}

[data-mode="gamer"] .hero-field-svg .sf-ring {
  opacity: 0.08;
}

[data-mode="gamer"] .capability-node {
  border-radius: var(--radius);
  border-width: 1px;
  padding: var(--space-lg);
  transition: border-color var(--duration-fast) var(--ease-sharp),
              transform var(--duration-fast) var(--ease-sharp),
              box-shadow var(--duration-fast) var(--ease-sharp);
}

[data-mode="gamer"] .capability-node::before,
[data-mode="gamer"] .capability-node::after {
  width: 12px;
  height: 12px;
  border-color: var(--energy);
  transition: opacity var(--duration-fast) var(--ease-sharp),
              border-color var(--duration-fast) var(--ease-sharp);
}

[data-mode="gamer"] .capability-node:hover {
  border-color: var(--energy);
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px rgba(255, 107, 53, 0.12);
}

[data-mode="gamer"] .capability-node:hover::before,
[data-mode="gamer"] .capability-node:hover::after {
  opacity: 1;
  border-color: var(--energy);
}

[data-mode="gamer"] .opmatrix-cell {
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: border-color var(--duration-fast) var(--ease-sharp),
              transform var(--duration-fast) var(--ease-sharp);
}

[data-mode="gamer"] .opmatrix-cell:hover {
  border-color: var(--energy);
  transform: translateY(-1px);
}

[data-mode="gamer"] .opmatrix-cell:hover::before {
  background-color: var(--energy);
}

[data-mode="gamer"] .section-header {
  margin-bottom: var(--space-xl);
}

[data-mode="gamer"] .section-anchor::before {
  width: 14px;
  background: linear-gradient(90deg, var(--accent), var(--energy));
}

[data-mode="gamer"] .eyebrow {
  letter-spacing: 0.12em;
  font-size: 0.6875rem;
  font-weight: 600;
}

[data-mode="gamer"] .eyebrow::before {
  content: "//";
  color: var(--energy);
}

[data-mode="gamer"] .section-separator::after {
  height: 1px;
}

/* Gamer motion — fastest, most responsive */
[data-mode="gamer"] {
  --duration: 160ms;
  --duration-fast: 100ms;
  --motion-intensity: 1.3;
}

[data-mode="gamer"] .reveal {
  transition: opacity 300ms var(--ease-sharp), transform 300ms var(--ease-sharp);
}

[data-mode="gamer"] .hero-field-svg .sf-node {
  animation-duration: 1.8s;
}

[data-mode="gamer"] .hero-field-svg .sf-link {
  animation-duration: 2.2s;
}

[data-mode="gamer"] .hero-field-svg .sf-ring {
  animation-duration: 8s;
}

[data-mode="gamer"] .btn-primary {
  transition: all var(--duration-fast) var(--ease-sharp);
}

[data-mode="gamer"] .btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px rgba(0, 163, 255, 0.15);
}

[data-mode="gamer"] .nav-links a::after {
  transition: width var(--duration-fast) var(--ease-sharp);
}

/* ─── Mode-specific hero field node counts (via CSS) ────────── */
/* Professional: sparse (hide every 3rd node) */
[data-mode="professional"] .hero-field-svg .sf-node:nth-child(3n) {
  opacity: 0.1;
}

/* Tactical: all nodes visible, precise */
[data-mode="tactical"] .hero-field-svg .sf-node:nth-child(3n) {
  opacity: 0.4;
}

/* Gamer: all nodes energetic */
[data-mode="gamer"] .hero-field-svg .sf-node:nth-child(3n) {
  opacity: 0.5;
}

/* ─── Mode-specific panel hover feedback ────────────────────── */

[data-mode="professional"] .capability-node:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
  transition: border-color var(--duration) ease, transform var(--duration) ease;
}

[data-mode="professional"] .opmatrix-cell:hover {
  border-color: var(--border-strong);
  transition: border-color var(--duration) ease;
}

/* ─── Mode-specific section rhythm ──────────────────────────── */

[data-mode="professional"] .section {
  padding: var(--space-3xl) 0;
}

[data-mode="tactical"] .section {
  padding: var(--space-2xl) 0;
}

[data-mode="gamer"] .section {
  padding: var(--space-3xl) 0;
}

[data-mode="tactical"] .section + .section {
  border-top: 1px solid var(--border-tactical);
}

/* ─── Light mode + mode-specific overrides ──────────────────── */

[data-theme="light"][data-mode="professional"] .hero-field-svg {
  opacity: 0.2;
}

[data-theme="light"][data-mode="tactical"] .hero-field-svg {
  opacity: 0.4;
}

[data-theme="light"][data-mode="gamer"] .hero-field-svg {
  opacity: 0.35;
}

[data-theme="light"][data-mode="gamer"] .hero h1 {
  text-shadow: none;
}

[data-theme="light"][data-mode="tactical"] .capability-node {
  border-color: var(--border-strong);
}

[data-theme="light"][data-mode="tactical"] .capability-node::before,
[data-theme="light"][data-mode="tactical"] .capability-node::after {
  border-color: var(--accent);
}

/* ─── Reduced motion — disable all 3G animations ────────────── */

@media (prefers-reduced-motion: reduce) {
  [data-mode="professional"] .reveal,
  [data-mode="tactical"] .reveal,
  [data-mode="gamer"] .reveal {
    transition: opacity 1ms !important, transform 1ms !important;
  }
  [data-mode="gamer"] .btn-primary:hover,
  [data-mode="gamer"] .capability-node:hover,
  [data-mode="gamer"] .opmatrix-cell:hover,
  [data-mode="tactical"] .capability-node:hover {
    transform: none !important;
  }
  [data-mode="gamer"] .hero h1 {
    text-shadow: none !important;
  }
}

/* ============================================================
   PHASE 3I — Interaction Identity Polish
   Each mode transforms the physical feel of elements.
   Different in grayscale, not just color.
   Preview-only. Production baseline locked.
   ============================================================ */

/* ─── Button Morphology by Mode ────────────────────────────── */

/* Professional: clean rectangular, softly rounded, editorial */
[data-mode="professional"] .btn {
  border-radius: 6px;
  font-weight: 600;
  letter-spacing: 0.05em;
  box-shadow: none;
}

[data-mode="professional"] .btn-primary {
  box-shadow: none;
}

[data-mode="professional"] .btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: none;
  transform: translateY(-1px);
}

[data-mode="professional"] .btn-secondary {
  border-color: var(--border-strong);
  background-color: transparent;
}

[data-mode="professional"] .btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: transparent;
  box-shadow: none;
  transform: translateY(-1px);
}

[data-mode="professional"] .btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  box-shadow: none;
}

[data-mode="professional"] .btn:active {
  transform: translateY(0);
  box-shadow: none;
}

/* Tactical: compact, sharp, technical inset line */
[data-mode="tactical"] .btn {
  border-radius: 2px;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 0.625rem 1.375rem;
}

[data-mode="tactical"] .btn-primary {
  border-color: var(--accent);
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.2);
}

[data-mode="tactical"] .btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.2),
              0 0 0 1px var(--accent-dim);
  transform: translateY(-1px);
}

[data-mode="tactical"] .btn-secondary {
  border-color: var(--border-tactical);
  background-color: transparent;
}

[data-mode="tactical"] .btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: var(--accent-dim);
  box-shadow: inset 0 0 0 1px var(--accent-dim);
  transform: translateY(-1px);
}

[data-mode="tactical"] .btn:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 1px;
  box-shadow: inset 0 0 0 1px var(--accent-dim);
}

[data-mode="tactical"] .btn:active {
  transform: translateY(0);
  box-shadow: inset 0 1px 0 rgba(0, 0, 0, 0.3);
}

/* Gamer: strongest physical response, quick snap, energy edge */
[data-mode="gamer"] .btn {
  border-radius: 6px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.75rem 1.5rem;
}

[data-mode="gamer"] .btn-primary {
  border-color: var(--accent);
  box-shadow: none;
}

[data-mode="gamer"] .btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 0 0 1px rgba(0, 163, 255, 0.15);
  transform: translateY(-2px);
}

[data-mode="gamer"] .btn-secondary {
  border-color: var(--border-strong);
  background-color: transparent;
  position: relative;
}

[data-mode="gamer"] .btn-secondary::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 50%;
  width: 0;
  height: 1px;
  background-color: var(--energy);
  transition: width var(--duration-fast) var(--ease-sharp),
              left var(--duration-fast) var(--ease-sharp);
}

[data-mode="gamer"] .btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: transparent;
  box-shadow: none;
  transform: translateY(-1px);
}

[data-mode="gamer"] .btn-secondary:hover::after {
  width: 100%;
  left: 0;
}

[data-mode="gamer"] .btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 1px rgba(255, 107, 53, 0.08);
}

[data-mode="gamer"] .btn:active {
  transform: translateY(0);
  box-shadow: 0 0 0 1px rgba(255, 107, 53, 0.12);
}

/* ─── Panel Hover Physics Refinement ───────────────────────── */

/* Professional: subtle tonal shift, flat-premium */
[data-mode="professional"] .capability-node {
  transition: border-color var(--duration) ease,
              background-color var(--duration) ease;
}

[data-mode="professional"] .capability-node:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-subtle);
  transform: none;
}

[data-mode="professional"] .opmatrix-cell {
  transition: border-color var(--duration) ease;
}

[data-mode="professional"] .opmatrix-cell:hover {
  border-color: var(--border-strong);
  transform: none;
}

/* Tactical: border activation + registration marks + translate */
[data-mode="tactical"] .capability-node {
  transition: border-color var(--duration-fast) var(--ease-sharp),
              transform var(--duration-fast) var(--ease-sharp);
}

[data-mode="tactical"] .opmatrix-cell {
  transition: border-color var(--duration-fast) var(--ease-sharp),
              transform var(--duration-fast) var(--ease-sharp);
}

[data-mode="tactical"] .opmatrix-cell:hover {
  transform: translateY(-1px);
}

/* Gamer: thin halo + micro-lift, quick */
[data-mode="gamer"] .capability-node {
  transition: border-color var(--duration-fast) var(--ease-sharp),
              transform var(--duration-fast) var(--ease-sharp),
              box-shadow var(--duration-fast) var(--ease-sharp);
}

[data-mode="gamer"] .opmatrix-cell {
  transition: border-color var(--duration-fast) var(--ease-sharp),
              transform var(--duration-fast) var(--ease-sharp);
}

/* ─── Hero CTA Posture by Mode ─────────────────────────────── */

[data-mode="professional"] .hero-actions {
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

[data-mode="tactical"] .hero-actions {
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

[data-mode="gamer"] .hero-actions {
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

/* ─── Section Separator Language by Mode ───────────────────── */

/* Professional: editorial lines, most air */
[data-mode="professional"] .section-separator {
  height: 1px;
  background-color: var(--border);
  margin: var(--space-2xl) 0;
}

[data-mode="professional"] .section-separator::after {
  background: linear-gradient(90deg, transparent, var(--accent-dim), transparent);
  height: 1px;
}

/* Tactical: structural dividers, grid pressure */
[data-mode="tactical"] .section-separator {
  height: 1px;
  background-color: var(--border-tactical);
  margin: var(--space-xl) 0;
}

[data-mode="tactical"] .section-separator::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 24px;
  height: 3px;
  background-color: var(--accent);
}

[data-mode="tactical"] .section-separator {
  position: relative;
}

/* Gamer: energetic separators, thin and controlled */
[data-mode="gamer"] .section-separator {
  height: 1px;
  background-color: var(--border);
  margin: var(--space-xl) 0;
}

[data-mode="gamer"] .section-separator::after {
  background: linear-gradient(90deg, transparent 10%, var(--accent) 40%, var(--energy) 60%, transparent 90%);
}

/* ─── Section Intro Framing by Mode ────────────────────────── */

/* Professional: editorial labels, calmest */
[data-mode="professional"] .section-header {
  margin-bottom: var(--space-xl);
}

/* Tactical: ops labels, focused */
[data-mode="tactical"] .section-header {
  margin-bottom: var(--space-lg);
}

[data-mode="tactical"] .section-header .eyebrow {
  color: var(--accent);
}

/* Gamer: performance labels, rare and short */
[data-mode="gamer"] .section-header {
  margin-bottom: var(--space-xl);
}

[data-mode="gamer"] .section-header .eyebrow {
  font-weight: 600;
}

/* ─── Active State Identity ────────────────────────────────── */

[data-mode="professional"] .btn-primary:active {
  background-color: var(--accent);
}

[data-mode="tactical"] .btn-primary:active {
  background-color: var(--accent);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

[data-mode="gamer"] .btn-primary:active {
  background-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(255, 107, 53, 0.15);
}

/* ─── Light Mode + 3I Refinements ──────────────────────────── */

[data-theme="light"][data-mode="professional"] .capability-node:hover {
  background-color: var(--bg-elevated);
}

[data-theme="light"][data-mode="tactical"] .btn-primary {
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}

[data-theme="light"][data-mode="gamer"] .btn-secondary::after {
  background-color: var(--energy);
}

/* ─── Reduced Motion — disable all 3I interactions ─────────── */

@media (prefers-reduced-motion: reduce) {
  [data-mode="professional"] .btn,
  [data-mode="professional"] .btn-primary:hover,
  [data-mode="professional"] .btn-secondary:hover,
  [data-mode="professional"] .capability-node:hover,
  [data-mode="professional"] .opmatrix-cell:hover,
  [data-mode="tactical"] .btn,
  [data-mode="tactical"] .btn-primary:hover,
  [data-mode="tactical"] .btn-secondary:hover,
  [data-mode="tactical"] .capability-node:hover,
  [data-mode="tactical"] .opmatrix-cell:hover,
  [data-mode="gamer"] .btn,
  [data-mode="gamer"] .btn-primary:hover,
  [data-mode="gamer"] .btn-secondary:hover,
  [data-mode="gamer"] .btn-secondary::after,
  [data-mode="gamer"] .capability-node:hover,
  [data-mode="gamer"] .opmatrix-cell:hover {
    transform: none !important;
    box-shadow: none !important;
  }
  [data-mode="gamer"] .btn-secondary::after {
    transition: none !important;
  }
}

/* ============================================================
   PHASE 3J — Visual Silhouette Differentiation
   Difference visible in first viewport, not just on hover.
   Hero field position, composition, shape language, posture.
   Preview-only. Production baseline locked.
   ============================================================ */

/* ─── Hero Field Position per Mode ─────────────────────────── */
/* Biggest silhouette gain: field moves and resizes per mode */

/* Professional: small, pushed right, most negative space */
[data-mode="professional"] .hero-field {
  width: 38%;
  right: 0;
  top: 10%;
  height: 80%;
}

/* Tactical: full-width background, command surface behind text */
[data-mode="tactical"] .hero-field {
  width: 100%;
  right: 0;
  top: 0;
  height: 100%;
}

/* Gamer: larger, dominant, slightly offset for tension */
[data-mode="gamer"] .hero-field {
  width: 55%;
  right: -3%;
  top: 5%;
  height: 90%;
}

/* ─── Hero Composition per Mode ────────────────────────────── */

/* Professional: widest text, most air, editorial stack */
[data-mode="professional"] .hero-inner {
  max-width: 680px;
}

[data-mode="professional"] .hero h1 {
  max-width: 620px;
}

[data-mode="professional"] .hero-eyebrow {
  margin-bottom: var(--space-lg);
}

[data-mode="professional"] .hero-subtitle {
  margin-top: var(--space-lg);
}

[data-mode="professional"] .hero-description {
  margin-top: var(--space-md);
}

[data-mode="professional"] .hero-actions {
  margin-top: var(--space-2xl);
  flex-direction: row;
  align-items: center;
}

[data-mode="professional"] .hero-meta {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border);
}

/* Tactical: compact, command callout, CTA close to text */
[data-mode="tactical"] .hero-inner {
  max-width: 720px;
}

[data-mode="tactical"] .hero h1 {
  max-width: 680px;
}

[data-mode="tactical"] .hero-eyebrow {
  margin-bottom: var(--space-md);
  letter-spacing: 0.15em;
}

[data-mode="tactical"] .hero-subtitle {
  margin-top: var(--space-md);
}

[data-mode="tactical"] .hero-description {
  margin-top: var(--space-sm);
}

[data-mode="tactical"] .hero-actions {
  margin-top: var(--space-lg);
  flex-direction: row;
  align-items: center;
}

[data-mode="tactical"] .hero-meta {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-tactical);
}

/* Gamer: dramatic, tight headline, CTA assertive */
[data-mode="gamer"] .hero-inner {
  max-width: 640px;
}

[data-mode="gamer"] .hero h1 {
  max-width: 600px;
}

[data-mode="gamer"] .hero-eyebrow {
  margin-bottom: var(--space-md);
  letter-spacing: 0.12em;
}

[data-mode="gamer"] .hero-subtitle {
  margin-top: var(--space-md);
}

[data-mode="gamer"] .hero-description {
  margin-top: var(--space-sm);
}

[data-mode="gamer"] .hero-actions {
  margin-top: var(--space-xl);
  flex-direction: row;
  align-items: center;
}

[data-mode="gamer"] .hero-meta {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}

/* ─── Button Silhouette Strengthening ──────────────────────── */

/* Professional: print-like clarity, softest rectangle */
[data-mode="professional"] .btn {
  border-radius: 8px;
  padding: 0.875rem 1.75rem;
  letter-spacing: 0.04em;
}

[data-mode="professional"] .btn-primary {
  border-width: 1px;
}

[data-mode="professional"] .btn-secondary {
  border-width: 1px;
}

/* Tactical: sharpest, most instrument-like */
[data-mode="tactical"] .btn {
  border-radius: 1px;
  padding: 0.625rem 1.25rem;
  letter-spacing: 0.1em;
  font-size: 0.8125rem;
}

[data-mode="tactical"] .btn-primary {
  border-width: 1px;
  border-left: 3px solid var(--accent);
}

[data-mode="tactical"] .btn-secondary {
  border-width: 1px;
  border-left: 3px solid var(--border-tactical);
}

[data-mode="tactical"] .btn-secondary:hover {
  border-left-color: var(--accent);
}

/* Gamer: assertive engage control */
[data-mode="gamer"] .btn {
  border-radius: 6px;
  padding: 0.875rem 1.625rem;
  letter-spacing: 0.03em;
  font-size: 0.9375rem;
}

[data-mode="gamer"] .btn-primary {
  border-width: 1px;
  border-bottom: 2px solid rgba(0, 0, 0, 0.2);
}

[data-mode="gamer"] .btn-secondary {
  border-width: 1px;
}

/* ─── Panel Silhouette Strengthening ───────────────────────── */

/* Professional: quietest, softest, most premium */
[data-mode="professional"] .capability-node {
  border-radius: 8px;
  border-width: 1px;
  padding: var(--space-xl);
}

[data-mode="professional"] .opmatrix-cell {
  border-radius: 8px;
  border-width: 1px;
  padding: var(--space-xl);
}

/* Tactical: crispest, most structural, thinnest radius */
[data-mode="tactical"] .capability-node {
  border-radius: 1px;
  border-width: 1px;
  padding: var(--space-md);
}

[data-mode="tactical"] .opmatrix-cell {
  border-radius: 1px;
  border-width: 1px;
  padding: var(--space-md);
}

/* Gamer: deeper, more layered, medium radius with depth */
[data-mode="gamer"] .capability-node {
  border-radius: 6px;
  border-width: 1px;
  padding: var(--space-lg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

[data-mode="gamer"] .opmatrix-cell {
  border-radius: 6px;
  border-width: 1px;
  padding: var(--space-lg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

/* ─── Section Intro Architecture per Mode ──────────────────── */

/* Professional: editorial, widest, most breathing */
[data-mode="professional"] .section-header {
  max-width: 680px;
  margin-bottom: var(--space-2xl);
}

[data-mode="professional"] .section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.015em;
}

[data-mode="professional"] .section-header .eyebrow {
  margin-bottom: var(--space-md);
}

/* Tactical: operational, focused, tightest */
[data-mode="tactical"] .section-header {
  max-width: 600px;
  margin-bottom: var(--space-lg);
}

[data-mode="tactical"] .section-header h2 {
  font-size: clamp(1.625rem, 3.5vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

[data-mode="tactical"] .section-header .eyebrow {
  margin-bottom: var(--space-sm);
}

/* Gamer: performance, dramatic, boldest */
[data-mode="gamer"] .section-header {
  max-width: 620px;
  margin-bottom: var(--space-xl);
}

[data-mode="gamer"] .section-header h2 {
  font-size: clamp(1.875rem, 4.5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

[data-mode="gamer"] .section-header .eyebrow {
  margin-bottom: var(--space-sm);
}

/* ─── Hero Field SVG Stroke Pattern per Mode ───────────────── */
/* Different visual organism, not just tuning */

/* Professional: schematic, dashed links, sparse */
[data-mode="professional"] .hero-field-svg .sf-link {
  stroke-dasharray: 3, 3;
}

/* Tactical: solid links, structured grid */
[data-mode="tactical"] .hero-field-svg .sf-link {
  stroke-dasharray: none;
}

/* Gamer: energetic, shorter dashes, charged */
[data-mode="gamer"] .hero-field-svg .sf-link {
  stroke-dasharray: 6, 2;
}

/* ─── Light Mode + 3J ──────────────────────────────────────── */

[data-theme="light"][data-mode="professional"] .hero-field {
  opacity: 0.7;
}

[data-theme="light"][data-mode="tactical"] .hero-field {
  opacity: 0.5;
}

[data-theme="light"][data-mode="gamer"] .hero-field {
  opacity: 0.6;
}

[data-theme="light"][data-mode="gamer"] .capability-node,
[data-theme="light"][data-mode="gamer"] .opmatrix-cell {
  box-shadow: inset 0 1px 0 rgba(0, 0, 0, 0.04);
}

[data-theme="light"][data-mode="tactical"] .btn-primary {
  border-left-color: var(--accent);
}

[data-theme="light"][data-mode="tactical"] .btn-secondary {
  border-left-color: var(--border-strong);
}

/* ─── Mobile + 3J ──────────────────────────────────────────── */

@media (max-width: 768px) {
  /* All modes: field hidden on mobile (existing) */
  /* Button silhouette differences preserved but compacted */
  [data-mode="professional"] .btn {
    padding: 0.75rem 1.5rem;
  }
  [data-mode="tactical"] .btn {
    padding: 0.625rem 1.125rem;
    border-left-width: 2px;
  }
  [data-mode="gamer"] .btn {
    padding: 0.75rem 1.375rem;
  }
  /* Hero inner max-widths relax on mobile */
  [data-mode="professional"] .hero-inner,
  [data-mode="tactical"] .hero-inner,
  [data-mode="gamer"] .hero-inner {
    max-width: 100%;
  }
}

/* ─── Reduced Motion — disable all 3J ──────────────────────── */

@media (prefers-reduced-motion: reduce) {
  [data-mode="professional"] .hero-field-svg .sf-link,
  [data-mode="tactical"] .hero-field-svg .sf-link,
  [data-mode="gamer"] .hero-field-svg .sf-link {
    stroke-dasharray: none !important;
  }
}

/* ============================================================
   PHASE 3K — Award-Worthy Signature Moments
   Three original moments: mode transition, switcher, capability map.
   Preview-only. Production baseline locked.
   ============================================================ */

/* ─── Motion Token Architecture ────────────────────────────── */

:root {
  --mode-duration: 400ms;
  --mode-ease: cubic-bezier(0.16, 1, 0.3, 1);
  --mode-travel: -1px;
}

[data-mode="professional"] {
  --mode-duration: 520ms;
  --mode-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --mode-travel: -1px;
}

[data-mode="tactical"] {
  --mode-duration: 260ms;
  --mode-ease: cubic-bezier(0.2, 0.9, 0.2, 1);
  --mode-travel: -1px;
}

[data-mode="gamer"] {
  --mode-duration: 180ms;
  --mode-ease: cubic-bezier(0.16, 1, 0.3, 1);
  --mode-travel: -2px;
}

/* ─── Moment 1: Adaptive Mode Transition ───────────────────── */
/* Properties transition smoothly when data-mode changes */

.hero-field {
  transition: width var(--mode-duration) var(--mode-ease),
              right var(--mode-duration) var(--mode-ease),
              top var(--mode-duration) var(--mode-ease),
              height var(--mode-duration) var(--mode-ease);
}

.hero-inner {
  transition: max-width var(--mode-duration) var(--mode-ease);
}

.hero h1 {
  transition: max-width var(--mode-duration) var(--mode-ease),
              letter-spacing var(--mode-duration) var(--mode-ease),
              line-height var(--mode-duration) var(--mode-ease),
              text-shadow var(--mode-duration) var(--mode-ease);
}

.hero-subtitle,
.hero-description {
  transition: max-width var(--mode-duration) var(--mode-ease);
}

.hero-actions {
  transition: margin-top var(--mode-duration) var(--mode-ease),
              gap var(--mode-duration) var(--mode-ease);
}

.hero-meta {
  transition: margin-top var(--mode-duration) var(--mode-ease),
              padding-top var(--mode-duration) var(--mode-ease);
}

.hero-eyebrow {
  transition: margin-bottom var(--mode-duration) var(--mode-ease),
              letter-spacing var(--mode-duration) var(--mode-ease);
}

/* Buttons transition shape on mode change */
.btn {
  transition: background-color var(--duration-fast) var(--ease-tactical),
              border-color var(--duration-fast) var(--ease-tactical),
              color var(--duration-fast) var(--ease-tactical),
              box-shadow var(--duration-fast) var(--ease-tactical),
              transform var(--duration-fast) var(--ease-tactical),
              border-radius var(--mode-duration) var(--mode-ease),
              padding var(--mode-duration) var(--mode-ease),
              letter-spacing var(--mode-duration) var(--mode-ease),
              font-size var(--mode-duration) var(--mode-ease);
}

/* Panels transition shape on mode change */
.capability-node {
  transition: border-color var(--duration-fast) var(--ease-sharp),
              background-color var(--duration) ease,
              transform var(--duration-fast) var(--ease-sharp),
              box-shadow var(--duration-fast) var(--ease-sharp),
              border-radius var(--mode-duration) var(--mode-ease),
              padding var(--mode-duration) var(--mode-ease);
}

.opmatrix-cell {
  transition: border-color var(--duration-fast) var(--ease-sharp),
              transform var(--duration-fast) var(--ease-sharp),
              box-shadow var(--duration-fast) var(--ease-sharp),
              border-radius var(--mode-duration) var(--mode-ease),
              padding var(--mode-duration) var(--mode-ease);
}

/* Section headers transition on mode change */
.section-header {
  transition: max-width var(--mode-duration) var(--mode-ease),
              margin-bottom var(--mode-duration) var(--mode-ease);
}

.section-header h2 {
  transition: font-size var(--mode-duration) var(--mode-ease),
              letter-spacing var(--mode-duration) var(--mode-ease);
}

/* Section separators transition on mode change */
.section-separator {
  transition: margin var(--mode-duration) var(--mode-ease);
}

/* ─── Moment 2: Nexus Mode Switcher ────────────────────────── */
/* Sliding physical indicator that moves between modes */

.mode-switcher {
  position: relative;
  border-radius: 6px;
  border-color: var(--border);
}

.mode-switcher::after {
  content: "";
  position: absolute;
  bottom: 0;
  height: 2px;
  background-color: var(--accent);
  transition: left var(--mode-duration) var(--mode-ease),
              width var(--mode-duration) var(--mode-ease),
              background-color var(--mode-duration) var(--mode-ease);
  pointer-events: none;
}

/* Indicator positions — assumes 3 equal-width buttons */
[data-mode="professional"] .mode-switcher::after {
  left: 4px;
  width: calc((100% - 8px) / 3);
  background-color: var(--accent);
  height: 2px;
}

[data-mode="tactical"] .mode-switcher::after {
  left: calc(4px + (100% - 8px) / 3);
  width: calc((100% - 8px) / 3);
  background-color: var(--accent);
  height: 3px;
}

[data-mode="gamer"] .mode-switcher::after {
  left: calc(4px + (100% - 8px) * 2 / 3);
  width: calc((100% - 8px) / 3);
  background-color: var(--energy);
  height: 2px;
}

/* Switcher button refinements */
.mode-switcher-btn {
  z-index: 1;
  transition: color var(--duration-fast) var(--ease-tactical),
              background-color var(--duration-fast) var(--ease-tactical);
}

/* Hover preview signal — no actual mode change */
.mode-switcher-btn:hover:not(.active) {
  color: var(--fg);
  background-color: var(--bg-subtle);
}

/* Active button — clean text, no background fill (indicator does the work) */
.mode-switcher-btn.active {
  color: var(--accent);
  background-color: transparent;
}

[data-mode="gamer"] .mode-switcher-btn.active {
  color: var(--energy);
}

/* Focus state */
.mode-switcher-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* Mode switcher status (aria-live) */
.mode-status {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ─── Moment 3: Capability Map Choreography ────────────────── */
/* Mode-specific staggered entrance waves */

/* Mode-specific stagger delays */
[data-mode="professional"] .reveal[data-stagger="1"] { transition-delay: 0ms; }
[data-mode="professional"] .reveal[data-stagger="2"] { transition-delay: 120ms; }
[data-mode="professional"] .reveal[data-stagger="3"] { transition-delay: 240ms; }
[data-mode="professional"] .reveal[data-stagger="4"] { transition-delay: 360ms; }

[data-mode="tactical"] .reveal[data-stagger="1"] { transition-delay: 0ms; }
[data-mode="tactical"] .reveal[data-stagger="2"] { transition-delay: 60ms; }
[data-mode="tactical"] .reveal[data-stagger="3"] { transition-delay: 120ms; }
[data-mode="tactical"] .reveal[data-stagger="4"] { transition-delay: 180ms; }

[data-mode="gamer"] .reveal[data-stagger="1"] { transition-delay: 0ms; }
[data-mode="gamer"] .reveal[data-stagger="2"] { transition-delay: 40ms; }
[data-mode="gamer"] .reveal[data-stagger="3"] { transition-delay: 80ms; }
[data-mode="gamer"] .reveal[data-stagger="4"] { transition-delay: 120ms; }

/* Capability map entrance — mode-specific transform character */
[data-mode="professional"] .capability-node.reveal {
  transform: translateY(calc(8px * var(--motion-intensity)));
}

[data-mode="tactical"] .capability-node.reveal {
  transform: translateY(calc(10px * var(--motion-intensity)));
}

[data-mode="gamer"] .capability-node.reveal {
  transform: translateY(calc(14px * var(--motion-intensity))) scale(0.98);
}

[data-mode="gamer"] .capability-node.reveal.visible {
  transform: translateY(0) scale(1);
}

/* Capability map container — subtle entrance frame */
.capability-map {
  transition: opacity var(--mode-duration) var(--mode-ease);
}

/* Opmatrix container */
.opmatrix {
  transition: opacity var(--mode-duration) var(--mode-ease);
}

/* ─── Light Mode + 3K ──────────────────────────────────────── */

[data-theme="light"] .mode-switcher {
  background-color: var(--bg-elevated);
  border-color: var(--border);
}

[data-theme="light"] .mode-switcher-btn:hover:not(.active) {
  background-color: var(--bg-subtle);
}

/* ─── Mobile + 3K ──────────────────────────────────────────── */

@media (max-width: 768px) {
  .mode-switcher {
    padding: 2px;
  }
  .mode-switcher::after {
    transition: left var(--mode-duration) var(--mode-ease),
                width var(--mode-duration) var(--mode-ease);
  }
  /* Mode transitions slightly faster on mobile */
  .hero-field,
  .hero-inner,
  .hero h1,
  .hero-actions,
  .btn,
  .capability-node,
  .opmatrix-cell,
  .section-header,
  .section-header h2 {
    transition-duration: calc(var(--mode-duration) * 0.75);
  }
}

/* ─── Reduced Motion — disable all 3K ──────────────────────── */

@media (prefers-reduced-motion: reduce) {
  /* Mode transitions become instant */
  .hero-field,
  .hero-inner,
  .hero h1,
  .hero-subtitle,
  .hero-description,
  .hero-actions,
  .hero-meta,
  .hero-eyebrow,
  .btn,
  .capability-node,
  .opmatrix-cell,
  .section-header,
  .section-header h2,
  .section-separator,
  .capability-map,
  .opmatrix {
    transition: none !important;
  }
  /* Mode switcher indicator — instant reposition */
  .mode-switcher::after {
    transition: none !important;
  }
  /* Capability map — no entrance animation */
  [data-mode="professional"] .capability-node.reveal,
  [data-mode="tactical"] .capability-node.reveal,
  [data-mode="gamer"] .capability-node.reveal {
    transform: none !important;
  }
  /* Stagger delays removed */
  [data-mode="professional"] .reveal[data-stagger],
  [data-mode="tactical"] .reveal[data-stagger],
  [data-mode="gamer"] .reveal[data-stagger] {
    transition-delay: 0ms !important;
  }
}

/* ============================================================
   PHASE 4A — Nexus Proof Layer
   Horizontal proof rail. Text-first. Mode-specific treatment.
   Preview-only. No cards, no icons, no badges.
   ============================================================ */

/* ─── Base Proof Rail ──────────────────────────────────────── */

.proof-rail-section {
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

.proof-rail {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin-top: var(--space-xl);
}

.proof-item {
  padding: 0 var(--space-lg);
  border-left: 1px solid var(--border);
  position: relative;
}

.proof-item:first-child {
  border-left: none;
  padding-left: 0;
}

.proof-item:last-child {
  padding-right: 0;
}

.proof-item-marker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--fg-subtle);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
  opacity: 0.7;
}

.proof-item-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin-bottom: var(--space-xs);
}

.proof-item-desc {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--fg-muted);
  max-width: 28ch;
}

/* ─── Mode: Professional — editorial rail ──────────────────── */

[data-mode="professional"] .proof-rail {
  gap: 0;
}

[data-mode="professional"] .proof-item {
  padding: 0 var(--space-xl);
}

[data-mode="professional"] .proof-item:first-child {
  padding-left: 0;
}

[data-mode="professional"] .proof-item-marker {
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  opacity: 0.5;
}

[data-mode="professional"] .proof-item-title {
  font-weight: 600;
  letter-spacing: -0.005em;
}

[data-mode="professional"] .proof-item-desc {
  max-width: 32ch;
  line-height: 1.6;
}

/* ─── Mode: Tactical — structured signal rail ──────────────── */

[data-mode="tactical"] .proof-rail {
  gap: 0;
}

[data-mode="tactical"] .proof-item {
  padding: 0 var(--space-md);
  border-left-width: 2px;
  border-left-color: var(--border-strong);
}

[data-mode="tactical"] .proof-item:first-child {
  border-left: none;
  padding-left: 0;
}

[data-mode="tactical"] .proof-item-marker {
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  opacity: 0.8;
  color: var(--accent);
}

[data-mode="tactical"] .proof-item-title {
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

[data-mode="tactical"] .proof-item-desc {
  font-size: 0.8125rem;
  max-width: 26ch;
  line-height: 1.5;
}

/* ─── Mode: Gamer — performance propagation ────────────────── */

[data-mode="gamer"] .proof-rail {
  gap: 0;
}

[data-mode="gamer"] .proof-item {
  padding: 0 var(--space-lg);
  border-left: 1px solid var(--border);
}

[data-mode="gamer"] .proof-item:first-child {
  border-left: none;
  padding-left: 0;
}

[data-mode="gamer"] .proof-item-marker {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  opacity: 0.7;
  color: var(--energy);
}

[data-mode="gamer"] .proof-item-title {
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: -0.015em;
}

[data-mode="gamer"] .proof-item-desc {
  font-size: 0.875rem;
  max-width: 28ch;
  line-height: 1.5;
}

/* ─── Light mode + Proof Rail ──────────────────────────────── */

[data-theme="light"] .proof-item {
  border-left-color: var(--border);
}

[data-theme="light"] [data-mode="tactical"] .proof-item {
  border-left-color: var(--border-strong);
}

/* ─── Mobile — vertical sequence ───────────────────────────── */

@media (max-width: 768px) {
  .proof-rail {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
  }

  .proof-item {
    padding: var(--space-md) 0 var(--space-md) var(--space-lg);
    border-left: 2px solid var(--border);
    border-bottom: none;
  }

  .proof-item:first-child {
    border-left: 2px solid var(--border);
    padding-left: var(--space-lg);
  }

  .proof-item:last-child {
    padding-right: 0;
  }

  .proof-item-desc {
    max-width: 100%;
  }

  [data-mode="tactical"] .proof-item {
    border-left-width: 2px;
  }

  [data-mode="gamer"] .proof-item {
    border-left-color: var(--border);
  }
}

@media (max-width: 480px) {
  .proof-item-title {
    font-size: 1rem;
  }

  .proof-item-desc {
    font-size: 0.8125rem;
  }
}

/* ─── Reduced motion — Proof Rail ──────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .proof-item.reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}