/* ===========================================================================
   ARNAV RAUT — CINEMATIC PORTFOLIO
   Stylesheet: Reset (§24) → Tokens (§21/22) → Grid (§23) → Components
   =========================================================================== */

/* ---------------------------------------------------------------------------
   00. GLOBAL RESET (§24 — loads first, blocking)
   --------------------------------------------------------------------------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; background: var(--bg-void); color: var(--text-primary); font-family: var(--font-body); }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; padding: 0; cursor: pointer; }
ul, ol { list-style: none; }
img, svg { display: block; max-width: 100%; }
html { -webkit-tap-highlight-color: transparent; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { overflow: hidden; line-height: 1.6; }

:focus-visible {
  outline: 2px solid var(--accent-teal);
  outline-offset: 3px;
}

/* ---------------------------------------------------------------------------
   01. DESIGN TOKENS (§21 Typography, §22 Color, §25 Motion)
   --------------------------------------------------------------------------- */
:root {
  /* Premium Dark Mode Aesthetic Colors */
  --bg-void: rgba(10, 12, 16, 1);
  --surface-panel: rgba(255, 255, 255, 0.03); /* Glass base */
  --surface-glass: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.1);
  
  --text-primary: #FFFFFF;
  --text-secondary: #E2E8F0;
  --text-muted: #94A3B8;
  
  /* Electric Accents */
  --accent-dawn: #FFB703; /* Electric gold */
  --accent-teal: #00E5FF; /* Neon cyan */
  --accent-nebula: #8B85F0;
  --border: rgba(255, 255, 255, 0.1);
  
  --success: #4ADE80;
  --warning: #FBBF24;
  --error: #F87171;

  /* Typography */
  --font-display: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --fs-h1: clamp(2.25rem, 4.5vw, 4.5rem);
  --fs-h2: clamp(1.75rem, 2.75vw, 2.5rem);
  --fs-h3: clamp(1.125rem, 1.5vw, 1.5rem);
  --fs-body: clamp(1rem, 1.1vw, 1.125rem);
  --fs-small: clamp(0.75rem, 0.85vw, 0.875rem);

  /* Spacing (4px base) */
  --space-1: 4px;  --space-2: 8px;  --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 48px; --space-8: 64px;
  --space-9: 96px; --space-10: 128px;

  /* Motion (§25) */
  --ease-micro: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1); /* Snappier ease-out */
  --ease-dramatic: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-micro: 300ms; /* Smooth 0.3s transition */
  --dur-standard: 400ms;
  --dur-dramatic: 900ms;

  /* Z-index registry (§27) */
  --z-canvas: 1;
  --z-overlay: 10;
  --z-nav: 20;
  --z-menu: 40;
  --z-loader: 50;
  --z-skip-link: 100;
}

/* ---------------------------------------------------------------------------
   02. ACCESSIBILITY — Skip Link (§24/§30)
   --------------------------------------------------------------------------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: 32px;
  z-index: var(--z-skip-link);
  background: var(--bg-void);
  color: var(--text-primary);
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--accent-teal);
  transition: top var(--dur-micro) var(--ease-micro);
}
.skip-link:focus { top: 32px; }

/* Visually hidden, screen-reader accessible */
.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;
}

/* ---------------------------------------------------------------------------
   02b. GLASSMORPHISM UTILITIES
   --------------------------------------------------------------------------- */
.glass-panel {
  background: var(--surface-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: inset 0 1px 1px var(--glass-border);
  border-radius: 16px;
  transition: all var(--dur-micro) var(--ease-standard);
}
.glass-panel:hover {
  transform: translateY(-4px);
  box-shadow: inset 0 1px 1px var(--glass-border), 0 8px 24px rgba(0, 0, 0, 0.4), 0 0 12px rgba(0, 229, 255, 0.1);
}

/* ---------------------------------------------------------------------------
   03. CANVAS LAYER (§27)
   --------------------------------------------------------------------------- */
#canvas-layer,
#canvas-layer canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: var(--z-canvas);
}
#canvas-layer { pointer-events: none; }

/* ---------------------------------------------------------------------------
   04. LOADER (§10) — cinematic, never generic
   --------------------------------------------------------------------------- */
#loader {
  position: fixed;
  inset: 0;
  z-index: var(--z-loader);
  background: var(--bg-void);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  transition: opacity 700ms var(--ease-dramatic), visibility 700ms var(--ease-dramatic);
}
#loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-title {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-primary);
}
.loader-subtitle {
  font-family: var(--font-mono);
  font-size: clamp(0.625rem, 0.7vw, 0.75rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: -12px;
}
.loader-line-wrap {
  width: 120px;
  height: 1px;
  background: var(--border);
  margin: 8px 0;
}
.loader-line {
  height: 100%;
  width: 0%;
  background: var(--accent-dawn);
  transition: width 80ms linear;
}
.loader-counter {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--text-muted);
  letter-spacing: 0.06em;
}
.loader-enter {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
  opacity: 0;
  transition: opacity var(--dur-standard) var(--ease-standard);
  margin-top: 12px;
  cursor: pointer;
}
.loader-enter.visible { opacity: 1; }

/* ---------------------------------------------------------------------------
   05. NAVIGATION (§09) — floating label on the world, not a webpage header
   --------------------------------------------------------------------------- */
#nav {
  position: fixed;
  top: 32px;
  left: 50%;
  transform: translateX(-50%);
  width: fit-content;
  gap: 48px;
  z-index: var(--z-nav);
  display: flex;
  justify-content: center;
  align-items: center;
  pointer-events: none;
}
#nav a, #nav button { pointer-events: auto; }

.nav-wordmark {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
  transition: color var(--dur-standard) var(--ease-standard);
}

.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}
.nav-links a,
.nav-links button {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
  position: relative;
  transition: color var(--dur-micro) var(--ease-micro);
}
.nav-links a::after,
.nav-links button::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent-teal); /* Glowing cyan underline */
  transition: width var(--dur-micro) var(--ease-micro);
  box-shadow: 0 0 8px var(--accent-teal);
}
.nav-links a:hover,
.nav-links button:hover,
.nav-links a:focus-visible,
.nav-links button:focus-visible {
  color: var(--accent-teal);
  text-shadow: 0 0 8px rgba(0, 229, 255, 0.4);
}
.nav-links a:hover::after,
.nav-links button:hover::after,
.nav-links a:focus-visible::after,
.nav-links button:focus-visible::after {
  width: 100%;
}

.menu-trigger { display: none; }

/* Nav dark-text mode for bright frames */
#nav.nav-bright .nav-wordmark,
#nav.nav-bright .nav-links a,
#nav.nav-bright .nav-links button {
  color: var(--bg-void);
}

/* ---------------------------------------------------------------------------
   06. MOBILE MENU OVERLAY (§09)
   --------------------------------------------------------------------------- */
#menu-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-menu);
  background: var(--bg-void);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 0 6vw;
  gap: 40px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--dur-standard) var(--ease-standard), visibility var(--dur-standard) var(--ease-standard);
}
#menu-overlay.open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.menu-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.menu-link {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: baseline;
  gap: 16px;
}
.menu-link-number {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--text-muted);
}

/* ---------------------------------------------------------------------------
   07. CHAPTER OVERLAY SYSTEM (§08/§12)
   --------------------------------------------------------------------------- */
#chapter-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  pointer-events: none;
}

.chapter {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  padding: 0 8vw;
  /* Top safe zone 120px for nav, bottom safe zone 80px */
  padding-top: 120px;
  padding-bottom: max(10vh, 80px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--dur-standard) var(--ease-standard),
              visibility var(--dur-standard) var(--ease-standard);
}
.chapter.active {
  opacity: 1;
  visibility: visible;
}
/* Re-enable pointer-events on interactive children */
.chapter.active .cta,
.chapter.active a,
.chapter.active button {
  pointer-events: auto;
}

.chapter-content {
  max-width: 560px;
  width: 100%;
  max-height: calc(100vh - 200px);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.chapter-content.right-anchor {
  margin-left: auto;
}
.chapter-content.centered {
  margin: 0 auto;
  text-align: center;
  max-width: 680px;
}

/* Directional scrim — soft, anchored to text column, not full-bleed */
.chapter.has-scrim-left::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(100% 100% at 0% 50%, rgba(5,7,13,0.65) 0%, rgba(5,7,13,0.3) 50%, transparent 100%);
  pointer-events: none;
  z-index: -1;
}
.chapter.has-scrim-right::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(100% 100% at 100% 50%, rgba(5,7,13,0.65) 0%, rgba(5,7,13,0.3) 50%, transparent 100%);
  pointer-events: none;
  z-index: -1;
}
.chapter.has-scrim-center::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center 70%, rgba(5,7,13,0.5) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

/* Chapter text entrance choreography (§08) */
.chapter .ch-label,
.chapter .ch-headline,
.chapter .ch-headline-line,
.chapter .ch-meta,
.chapter .ch-body,
.chapter .ch-cta-row,
.chapter .ch-education,
.chapter .ch-skills-row,
.chapter .ch-achievement {
  opacity: 0;
  transform: translateY(12px);
  filter: blur(4px);
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.6), 0 1px 3px rgba(0, 0, 0, 0.8);
  transition: opacity 500ms var(--ease-standard),
              transform 500ms var(--ease-standard),
              filter 500ms var(--ease-standard);
}
.chapter.active .ch-label { opacity: 1; transform: translateY(0); filter: blur(0); transition-delay: 0ms; }
.chapter.active .ch-headline { opacity: 1; transform: translateY(0); filter: blur(0); transition-delay: 80ms; }
.chapter.active .ch-headline-line:nth-child(1) { opacity: 1; transform: translateY(0); filter: blur(0); transition-delay: 80ms; }
.chapter.active .ch-headline-line:nth-child(2) { opacity: 1; transform: translateY(0); filter: blur(0); transition-delay: 160ms; }
.chapter.active .ch-headline-line:nth-child(3) { opacity: 1; transform: translateY(0); filter: blur(0); transition-delay: 240ms; }
.chapter.active .ch-meta { opacity: 1; transform: translateY(0); filter: blur(0); transition-delay: 200ms; }
.chapter.active .ch-body { opacity: 1; transform: translateY(0); filter: blur(0); transition-delay: 280ms; }
.chapter.active .ch-cta-row { opacity: 1; transform: translateY(0); filter: blur(0); transition-delay: 360ms; }
.chapter.active .ch-education { opacity: 1; transform: translateY(0); filter: blur(0); transition-delay: 360ms; }
.chapter.active .ch-skills-row { opacity: 1; transform: translateY(0); filter: blur(0); transition-delay: 200ms; }
.chapter.active .ch-achievement { opacity: 1; transform: translateY(0); filter: blur(0); transition-delay: 100ms; }

/* Exit choreography — downward, no blur */
.chapter:not(.active) .ch-label,
.chapter:not(.active) .ch-headline,
.chapter:not(.active) .ch-headline-line,
.chapter:not(.active) .ch-meta,
.chapter:not(.active) .ch-body,
.chapter:not(.active) .ch-cta-row,
.chapter:not(.active) .ch-education,
.chapter:not(.active) .ch-skills-row,
.chapter:not(.active) .ch-achievement {
  transform: translateY(8px);
  filter: blur(0);
  transition-duration: 300ms;
}

/* ---------------------------------------------------------------------------
   08. CHAPTER INDICATOR (§12) — bottom-right quiet instrument
   --------------------------------------------------------------------------- */
#chapter-indicator {
  display: none !important;
}
.ci-number { color: var(--text-primary); }
.ci-total { color: var(--text-muted); }
.ci-theme {
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: opacity var(--dur-micro) var(--ease-micro);
}

/* ---------------------------------------------------------------------------
   09. SCROLL CUE (§11)
   --------------------------------------------------------------------------- */
.scroll-cue {
  position: fixed;
  bottom: 32px;
  right: 48px;
  left: auto;
  transform: none;
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  opacity: 0;
  transition: opacity var(--dur-standard) var(--ease-standard);
  pointer-events: none;
}
.scroll-cue.visible { opacity: 1; }
.scroll-cue-text {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-gold);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.9), 0 0 16px rgba(255, 183, 3, 0.4);
}
.scroll-cue-line {
  width: 1px;
  height: 32px;
  background: var(--text-primary);
  animation: scrollPulse 2s var(--ease-standard) infinite;
  transform-origin: top;
}
@keyframes scrollPulse {
  0% { transform: scaleY(0); opacity: 0; }
  50% { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(0); opacity: 0; }
}

/* ---------------------------------------------------------------------------
   10. EDITORIAL CTA (§24) — text + thin rule + arrow, never pill/filled
   --------------------------------------------------------------------------- */
.cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
  padding: 12px 0 4px 0; /* Expanded touch target height */
  margin: -12px 0 0 0;
  transition: all var(--dur-micro) var(--ease-standard);
}
.cta:hover, .cta:focus-visible {
  border-color: var(--accent-cyan);
  color: var(--accent-teal);
  text-shadow: 0 0 8px rgba(0, 229, 255, 0.4);
  transform: translateY(-2px);
}
a[href^="mailto:"] {
  text-transform: lowercase;
}
.cta .arrow {
  transition: transform var(--dur-micro) var(--ease-micro);
  font-size: 0.85em;
}
.cta:hover .arrow { transform: translate(3px, -3px); }

.cta-row {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

/* ---------------------------------------------------------------------------
   11. HERO (§11) — Chapter 01
   --------------------------------------------------------------------------- */
#chapter-01 {
  align-items: flex-end;
  padding-bottom: 8vh;
}
.hero-name-label {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-gold);
  text-shadow: 0 0 16px rgba(255, 183, 3, 0.5), 0 0 32px rgba(255, 183, 3, 0.2);
  margin-bottom: var(--space-4);
}
.hero-headline {
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 700;
  line-height: 0.95;
  color: var(--text-primary);
  margin-bottom: var(--space-5);
}
.hero-headline-line {
  display: block;
}
.hero-meta {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ---------------------------------------------------------------------------
   12. CHAPTER 02 — Exploration/Discover (§07)
   --------------------------------------------------------------------------- */
#chapter-02 {
  align-items: center;
}
.explore-statement {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.5;
  max-width: 520px;
}
.explore-skills-preview {
  margin-top: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.tech-capsule {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  padding: 6px 16px;
  background: var(--surface-glass);
  border: 1px solid var(--glass-border);
  border-radius: 9999px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all var(--dur-micro) var(--ease-standard);
}
.tech-capsule::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 6px var(--accent-teal);
}
.tech-capsule:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 229, 255, 0.1);
  border-color: rgba(0, 229, 255, 0.3);
}

/* ---------------------------------------------------------------------------
   13. PROJECT EXPERIENCE SYSTEM (§13-16) — floats with the scene, not cards
   --------------------------------------------------------------------------- */
.project-number {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-teal);
  text-shadow: 0 0 8px rgba(0, 229, 255, 0.4);
  margin-bottom: var(--space-3);
}
.project-title {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}
.project-thesis {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  color: var(--text-secondary);
  margin-bottom: var(--space-5);
  line-height: 1.6;
}
.project-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: var(--space-3);
}
.project-meta-item {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.project-metric {
  margin-bottom: var(--space-6);
}
.telemetry-widget {
  display: inline-flex;
  flex-direction: column;
  background: rgba(10, 12, 16, 0.8);
  border: 1px solid var(--glass-border);
  border-left: 2px solid var(--accent-cyan);
  padding: 12px 16px;
  border-radius: 8px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.05), 0 4px 16px rgba(0, 0, 0, 0.4);
}
.telemetry-widget .tw-label {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.telemetry-widget .tw-value {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--success);
  letter-spacing: 0.04em;
  text-shadow: 0 0 8px rgba(74, 222, 128, 0.4);
}

/* Placeholder data visualization line */
.project-viz-placeholder {
  width: 100%;
  height: 80px;
  margin-bottom: var(--space-6);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  background: rgba(10, 12, 16, 0.5);
}
.project-viz-placeholder svg {
  width: 100%;
  height: 100%;
}
.viz-line-actual {
  stroke: var(--accent-teal);
  stroke-width: 1.5;
  fill: none;
  stroke-dasharray: 4 4;
  opacity: 0.8;
}
.viz-line-predicted {
  stroke: var(--accent-dawn);
  stroke-width: 1.5;
  fill: none;
  stroke-dasharray: 4 4;
  opacity: 0.8;
}
.viz-label {
  font-family: var(--font-mono);
  font-size: 9px;
  fill: var(--text-muted);
  letter-spacing: 0.06em;
}

/* ---------------------------------------------------------------------------
   14. ABOUT / SKILLS / ACHIEVEMENT (§17-19)
   --------------------------------------------------------------------------- */
.about-statement {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: var(--space-6);
}
.about-detail {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
  color: var(--text-muted);
  line-height: 1.8;
  text-transform: uppercase;
}
.about-detail strong {
  color: var(--text-secondary);
  font-weight: 500;
}

.skills-section {
  margin-top: var(--space-6);
}
.skills-category {
  margin-bottom: var(--space-4);
}
.skills-category-label {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dawn);
  margin-bottom: var(--space-2);
}
.skills-list {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 500;
  color: var(--text-secondary);
  line-height: 1.8;
}

.achievement-entry {
  margin-bottom: var(--space-5);
}
.achievement-label {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}
.achievement-text {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---------------------------------------------------------------------------
   15. CONTACT (§20) — the emotional close
   --------------------------------------------------------------------------- */
#chapter-05 {
  align-items: flex-end;
  padding-bottom: 6vh;
}
.contact-headline {
  font-family: var(--font-display);
  font-size: clamp(2rem, 7vh, 4.5rem);
  font-weight: 700;
  line-height: 0.95;
  color: var(--text-primary);
  margin-bottom: min(4vh, 48px);
}
.contact-headline-line { display: block; }

.contact-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: min(6vh, 64px);
}
.contact-row .cta {
  color: var(--text-secondary);
}

.footer-line {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.2);
}

/* ---------------------------------------------------------------------------
   16. REDUCED-MOTION FALLBACK (§30)
   --------------------------------------------------------------------------- */
body.reduced-motion-mode {
  overflow-x: hidden;
  overflow-y: auto !important;
}
body.reduced-motion-mode .chapter {
  position: relative !important;
  inset: auto !important;
  opacity: 1 !important;
  visibility: visible !important;
  padding: var(--space-9) 8vw !important;
  min-height: 100vh;
  align-items: center !important;
}
body.reduced-motion-mode .chapter .ch-label,
body.reduced-motion-mode .chapter .ch-headline,
body.reduced-motion-mode .chapter .ch-headline-line,
body.reduced-motion-mode .chapter .ch-meta,
body.reduced-motion-mode .chapter .ch-body,
body.reduced-motion-mode .chapter .ch-cta-row,
body.reduced-motion-mode .chapter .ch-education,
body.reduced-motion-mode .chapter .ch-skills-row,
body.reduced-motion-mode .chapter .ch-achievement {
  opacity: 1 !important;
  transform: none !important;
  filter: none !important;
}
body.reduced-motion-mode #chapter-overlay {
  position: relative;
}
body.reduced-motion-mode .scroll-cue,
body.reduced-motion-mode #chapter-indicator {
  display: none;
}

/* ---------------------------------------------------------------------------
   17. RESPONSIVE (§28/§29)
   --------------------------------------------------------------------------- */

/* --- TABLET (1023px and below) --- */
@media (max-width: 1023px) {
  .chapter-content { max-width: 480px; }
  .contact-container { padding: 120px 6vw 60px; }
  .case-study-hero { padding: 140px 6vw 60px; }
  .case-study-content { padding: 0 6vw 80px; }
  .contact-hero-body { flex-direction: column; gap: var(--space-4); }
}

/* --- MOBILE (767px and below) --- */
@media (max-width: 767px) {

  /* Nav: hide desktop links, show hamburger */
  .nav-links { display: none !important; }
  .menu-trigger {
    display: flex;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
  }

  /* Nav positioning on mobile */
  #nav {
    top: 12px;
    left: 16px;
    right: 16px;
    width: auto;
    transform: none;
    justify-content: space-between;
  }

  /* Chapter content */
  .chapter {
    padding: 80px 6vw max(5vh, 32px) 6vw;
    align-items: flex-end;
  }
  .chapter-content {
    max-width: 100%;
  }
  .chapter-content.right-anchor {
    margin-left: 0;
  }
  .chapter-content.centered {
    max-width: 100%;
  }

  /* Hero heading */
  .hero-headline {
    font-size: clamp(2rem, 10vw, 3.5rem);
  }
  .hero-name-label {
    font-size: clamp(1.2rem, 5vw, 1.6rem);
  }

  /* Project meta capsules stack */
  .project-meta-row {
    flex-direction: column;
    gap: 8px;
  }
  .tech-capsule {
    font-size: 10px;
  }

  /* Telemetry widget */
  .telemetry-widget {
    max-width: 100%;
  }

  /* Contact row stacks vertically */
  .contact-headline {
    font-size: clamp(2rem, 10vw, 3.5rem);
  }
  .contact-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  .contact-row .cta {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  /* CTA row stacks */
  .cta-row {
    flex-direction: column;
    gap: 12px;
  }

  /* Chapter indicator */
  #chapter-indicator { right: 16px; bottom: 16px; }

  /* Scroll cue on mobile */
  .scroll-cue {
    right: 24px;
    bottom: 24px;
  }

  /* Explore skills */
  .explore-skills-preview {
    gap: 8px;
  }

  /* --- Contact Page Mobile --- */
  .contact-container {
    padding: 100px 6vw 48px;
  }
  .contact-hero-title {
    font-size: clamp(2rem, 8vw, 3rem);
  }
  .form-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  .contact-direct {
    flex-direction: column;
    gap: var(--space-3);
  }
  .contact-footer {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }

  /* --- About Page Mobile --- */
  .about-container {
    padding: 0 6vw;
  }
  .about-page {
    padding-top: 100px;
    padding-bottom: 60px;
  }

  /* --- Case Study Mobile --- */
  .case-study-hero {
    padding: 100px 6vw 48px;
  }
  .case-study-content {
    padding: 0 6vw 60px;
  }
  .case-study-meta-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------------------------
   18. CASE STUDY PAGES (§13 — static /work/*.html)
   --------------------------------------------------------------------------- */
.case-study-page {
  overflow-y: auto;
  background: radial-gradient(circle at 50% 0%, #141A2E 0%, #05070D 100%);
  background-color: var(--bg-void);
  min-height: 100vh;
}
.case-study-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  padding: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.case-study-hero {
  padding: 160px 8vw 80px;
  max-width: 960px;
}
.case-study-hero .ch-label {
  opacity: 1; transform: none; filter: none;
}
.case-study-content {
  max-width: 960px;
  padding: 0 8vw 120px;
}
.case-study-content section {
  margin-bottom: var(--space-9);
}
.case-study-content h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}
.case-study-content p {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}
.case-study-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-5);
  background: var(--surface-panel);
  border: 1px solid var(--border);
  padding: var(--space-5);
  border-radius: 2px;
  margin-bottom: var(--space-8);
}
.case-study-meta-item label {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(0.625rem, 0.7vw, 0.75rem);
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}
.case-study-meta-item span {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--text-primary);
  font-weight: 500;
}
.chart-card {
  background: var(--surface-panel);
  border: 1px solid var(--border);
  padding: var(--space-6);
  margin: var(--space-6) 0;
}
.chart-card-title {
  font-family: var(--font-mono);
  font-size: clamp(0.625rem, 0.7vw, 0.75rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}
.chart-container {
  position: relative;
  width: 100%;
  height: 340px;
}
.data-required {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(0.625rem, 0.7vw, 0.6875rem);
  color: var(--accent-dawn);
  border: 1px dashed var(--accent-dawn);
  padding: var(--space-2) var(--space-4);
  margin-top: var(--space-3);
  opacity: 0.8;
}

/* Traversal Nav */
.case-study-traversal {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--border);
  margin: 0;
}
.traversal-link, .traversal-disabled {
  display: flex;
  flex-direction: column;
  padding: 48px 8vw;
  text-decoration: none;
  transition: background var(--dur-standard) var(--ease-standard);
}
.traversal-link:hover {
  background: var(--surface-panel);
}
.traversal-prev { border-right: 1px solid var(--border); }
.traversal-next { text-align: right; align-items: flex-end; }
.traversal-disabled {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  justify-content: center;
  align-items: center;
}
.traversal-label {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}
.traversal-title {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  color: var(--text-primary);
  font-weight: 500;
  transition: color var(--dur-standard) var(--ease-standard);
}
.traversal-link:hover .traversal-title {
  color: var(--accent-teal);
}

@media (max-width: 767px) {
  .case-study-traversal {
    grid-template-columns: 1fr;
  }
  .traversal-prev { border-right: none; border-bottom: 1px solid var(--border); }
  .traversal-next { text-align: left; align-items: flex-start; }
  .traversal-link, .traversal-disabled { padding: 32px 6vw; }
}

/* ---------------------------------------------------------------------------
   20. DEDICATED CONTACT PAGE
   --------------------------------------------------------------------------- */
.contact-page {
  background: radial-gradient(circle at 50% 0%, #141A2E 0%, #05070D 100%);
  background-color: var(--bg-void);
  min-height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
}

.contact-nav-bar {
  position: fixed;
  top: 32px;
  left: 32px;
  right: 32px;
  z-index: var(--z-nav);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.contact-nav-bar .nav-links a {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color var(--dur-micro) var(--ease-micro);
}
.contact-nav-bar .nav-links a:hover,
.contact-nav-bar .nav-links a.active {
  color: var(--accent-dawn);
}

.contact-container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 140px 8vw 80px;
}

.contact-hero {
  margin-bottom: var(--space-8);
}
.contact-hero-label {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  color: var(--accent-dawn);
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}
.contact-hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 5.25rem);
  font-weight: 700;
  line-height: 0.95;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
}
.contact-hero-title .title-accent {
  font-style: italic;
  font-weight: 500;
  color: var(--accent-dawn);
}

.contact-hero-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
@media (min-width: 768px) {
  .contact-hero-body {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }
}

.contact-intro-text {
  font-family: var(--font-body);
  font-size: var(--fs-h3);
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 540px;
}

.contact-direct-option {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.direct-label {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-transform: uppercase;
}
.contact-direct-email {
  font-size: var(--fs-body);
}

/* FORM STYLING */
.contact-form-section {
  border-top: 1px solid var(--border);
  padding-top: var(--space-8);
  margin-bottom: var(--space-9);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}
@media (min-width: 768px) {
  .form-row {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  position: relative;
}
.form-group.full-width {
  margin-bottom: var(--space-7);
}

.form-label {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--dur-micro) var(--ease-micro);
}

.form-input {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  color: var(--text-primary);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  border-radius: 0;
  outline: none;
  transition: border-color var(--dur-micro) var(--ease-micro);
}
.form-input::placeholder {
  color: rgba(180, 197, 228, 0.35);
}
.form-input:focus {
  border-color: var(--accent-teal);
}
.form-group:focus-within .form-label {
  color: var(--accent-teal);
}

.form-input.has-error {
  border-color: var(--error);
}

.form-error-msg {
  display: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--error);
  margin-top: 4px;
}

.form-textarea {
  resize: vertical;
  min-height: 110px;
}

.form-actions {
  display: flex;
  justify-content: flex-start;
}

.form-submit-btn {
  background: transparent;
  cursor: pointer;
}

/* SUCCESS & ERROR STATES */
.contact-success-state,
.contact-error-state {
  padding: var(--space-7) var(--space-6);
  border: 1px solid var(--border);
  background: rgba(16, 20, 42, 0.6);
  animation: fadeIn var(--dur-standard) var(--ease-standard);
}
.contact-success-state.hidden,
.contact-error-state.hidden,
#contact-form.hidden {
  display: none !important;
}

.success-badge {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  color: var(--success);
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}
.error-badge {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  color: var(--error);
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.success-title,
.error-title {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.success-desc,
.error-desc {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

/* FOOTER */
.contact-footer {
  border-top: 1px solid var(--border);
  padding-top: var(--space-7);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
@media (min-width: 768px) {
  .contact-footer {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.footer-wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-body);
  color: var(--text-primary);
}
.footer-copy {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.footer-social-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
}

/* ---------------------------------------------------------------------------
   21. PREFERS-REDUCED-MOTION (§25/§30)
   --------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .chapter .ch-label,
  .chapter .ch-headline,
  .chapter .ch-headline-line,
  .chapter .ch-meta,
  .chapter .ch-body,
  .chapter .ch-cta-row,
  .chapter .ch-education,
  .chapter .ch-skills-row,
  .chapter .ch-achievement {
    transition-duration: 150ms !important;
    filter: none !important;
    transform: none !important;
  }
  .scroll-cue-line { animation: none; }
}