/* =========================================================================
   Filion - 3D Spatial & Cyber Violet Design System
   Tailored specifically for Filion 3D GLB Model Viewer
   ========================================================================= */

:root {
  color-scheme: dark;
  --bg-base: #07080c;
  --bg-surface: #0e1017;
  --bg-elevated: #151822;
  --bg-glass: rgba(14, 16, 23, 0.85);
  --bg-glass-card: rgba(20, 23, 34, 0.72);

  /* Neon Violet & Amethyst Glow */
  --violet-300: #d8b4fe;
  --violet-400: #c084fc;
  --violet-500: #a66af4;
  --violet-600: #8b5cf6;
  --violet-glow: rgba(166, 106, 244, 0.22);
  --violet-glow-strong: rgba(166, 106, 244, 0.45);

  /* Holographic Cyan & Turquoise */
  --cyan-300: #67e8f9;
  --cyan-400: #22d3ee;
  --cyan-500: #06b6d4;
  --cyan-glow: rgba(34, 211, 238, 0.18);
  --cyan-glow-strong: rgba(34, 211, 238, 0.38);

  /* Warm Gold & Accent Colors */
  --amber-400: #fbbf24;
  --emerald-400: #34d399;
  --rose-400: #fb7185;

  /* Typography & Neutral Shades */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dim: #475569;

  /* Hairline Borders & Gradients */
  --border-hairline: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.14);
  --border-violet: rgba(166, 106, 244, 0.35);
  --border-glow: linear-gradient(135deg, rgba(166, 106, 244, 0.4), rgba(34, 211, 238, 0.2), rgba(166, 106, 244, 0.1));

  /* Shadows & Spring Transitions */
  --shadow-card: 0 16px 40px -10px rgba(0, 0, 0, 0.65), 0 0 0 1px var(--border-hairline);
  --shadow-glow: 0 20px 50px -12px rgba(166, 106, 244, 0.28);
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.2, 0.8, 0.2, 1);

  --font-display: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace, ui-monospace;
  --shell-max: 1200px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  line-height: 1.6;
  background: var(--bg-base);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

/* Accessible Skip Link */
.skip-link {
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 999;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--violet-500);
  color: #fff;
  font-weight: 600;
  font-size: 0.88rem;
  transform: translateY(-180%);
  transition: transform 0.2s var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
}

/* Ambient Radial Mesh Background */
.ambient-bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.35;
  will-change: transform;
  pointer-events: none;
}

.ambient-blob-1 {
  top: -10%;
  left: 15%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(166, 106, 244, 0.4), transparent 70%);
}

.ambient-blob-2 {
  top: 30%;
  right: -5%;
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.3), transparent 70%);
}

.ambient-blob-3 {
  bottom: 10%;
  left: 5%;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.25), transparent 70%);
}

/* Container Shell */
.shell {
  width: min(calc(100% - 32px), var(--shell-max));
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

@media (min-width: 640px) {
  .shell {
    width: min(calc(100% - 48px), var(--shell-max));
  }
}

/* Header & Floating Glass Navbar */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 14px 0;
  transition: all 0.3s var(--ease-out);
}

.site-header.scrolled {
  padding: 8px 0;
}

.nav-pill {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px 8px 12px;
  border-radius: 999px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-hairline);
  box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
  transition: all 0.3s var(--ease-out);
}

.site-header.scrolled .nav-pill {
  border-color: var(--border-light);
  box-shadow: 0 15px 35px -5px rgba(0, 0, 0, 0.7), 0 0 20px -5px var(--violet-glow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-icon {
  width: 36px;
  height: 36px;
  object-fit: contain;
  transition: transform 0.3s var(--ease-spring);
}

.brand:hover .brand-icon {
  transform: rotate(-8deg) scale(1.08);
}

.nav-links {
  display: none;
  align-items: center;
  gap: 26px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
}

@media (min-width: 960px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  transition: color 0.2s ease;
  position: relative;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

@media (min-width: 640px) {
  .nav-actions {
    gap: 12px;
  }
}

.btn-nav-ghost {
  display: none;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 999px;
  transition: all 0.2s ease;
}

@media (min-width: 768px) {
  .btn-nav-ghost {
    display: inline-flex;
  }
}

.btn-nav-ghost:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.btn-nav-download {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--violet-500), #7c3aed);
  color: #fff;
  box-shadow: 0 4px 18px var(--violet-glow);
  transition: all 0.25s var(--ease-out);
}

@media (min-width: 600px) {
  .btn-nav-download {
    display: inline-flex;
  }
}

.btn-nav-download:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--violet-glow-strong);
  filter: brightness(1.08);
}

.nav-mobile-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
  border-radius: 10px;
  transition: background 0.2s ease;
}

.nav-mobile-btn:hover {
  background: rgba(255, 255, 255, 0.08);
}

@media (min-width: 960px) {
  .nav-mobile-btn {
    display: none;
  }
}

/* Fullscreen Mobile Navigation Overlay */
.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(7, 8, 12, 0.96);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: calc(85px + env(safe-area-inset-top)) 24px calc(24px + env(safe-area-inset-bottom));
  overflow-y: auto;
}

.mobile-nav-overlay.open {
  transform: translateX(0);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: center;
}

.mobile-nav-link {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 12px 16px;
  border-radius: 16px;
  transition: all 0.2s ease;
}

.mobile-nav-link:hover,
.mobile-nav-link:active {
  color: var(--text-primary);
  background: rgba(166, 106, 244, 0.12);
}

.mobile-nav-divider {
  width: 60px;
  height: 2px;
  background: var(--border-light);
  margin: 12px auto;
}

.mobile-nav-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.mobile-nav-social {
  display: flex;
  justify-content: center;
  gap: 16px;
}

.mobile-nav-social a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding: 10px 16px;
  border-radius: 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
}

.mobile-nav-btn-download {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 24px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--violet-500), #7c3aed);
  color: #fff;
  box-shadow: 0 6px 25px var(--violet-glow-strong);
}

/* Hero Section */
.hero {
  padding-top: 130px;
  padding-bottom: 60px;
  min-height: calc(100vh - 40px);
  display: flex;
  align-items: center;
}

@media (min-width: 768px) {
  .hero {
    padding-top: 140px;
    padding-bottom: 80px;
  }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

@media (min-width: 980px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 60px;
  }
}

.hero-copy {
  text-align: center;
}

@media (min-width: 980px) {
  .hero-copy {
    text-align: left;
  }
}

.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: rgba(166, 106, 244, 0.12);
  color: var(--violet-300);
  border: 1px solid var(--border-violet);
  margin-bottom: 20px;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 10px var(--cyan-400);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.6; }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.035em;
  margin-bottom: 18px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--violet-400) 10%, var(--cyan-400) 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 580px;
  margin: 0 auto 28px;
}

@media (min-width: 980px) {
  .hero-description {
    margin-inline: 0;
  }
}

/* GitHub Stats Bar */
.gh-stats-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 28px;
}

@media (min-width: 980px) {
  .gh-stats-bar {
    justify-content: flex-start;
  }
}

.gh-stat-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
  background: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
  color: var(--text-secondary);
  transition: all 0.25s var(--ease-out);
}

.gh-stat-badge:hover {
  background: var(--bg-surface);
  border-color: var(--border-light);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.gh-stat-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-primary);
}

.gh-stat-sep {
  width: 1px;
  height: 14px;
  background: var(--border-light);
}

/* Hero Actions */
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 26px;
}

@media (min-width: 980px) {
  .hero-actions {
    justify-content: flex-start;
  }
}

.btn-primary-hero {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--violet-500), #7c3aed);
  color: #fff;
  box-shadow: 0 8px 30px var(--violet-glow-strong);
  transition: all 0.25s var(--ease-out);
  width: 100%;
}

@media (min-width: 480px) {
  .btn-primary-hero {
    width: auto;
  }
}

.btn-primary-hero:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(166, 106, 244, 0.5);
  filter: brightness(1.1);
}

.btn-secondary-hero {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  background: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
  color: var(--text-primary);
  transition: all 0.25s var(--ease-out);
  width: 100%;
}

@media (min-width: 480px) {
  .btn-secondary-hero {
    width: auto;
  }
}

.btn-secondary-hero:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-light);
  transform: translateY(-2px);
}

.trust-pills {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
  font-size: 0.84rem;
  color: var(--text-muted);
}

@media (min-width: 980px) {
  .trust-pills {
    justify-content: flex-start;
  }
}

.trust-pills span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.trust-pills i {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-dim);
}

/* 3D Visual Stage (Right Column) */
.hero-3d-stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30px 10px;
  max-width: 100%;
  overflow: hidden;
}

.stage-halo {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(166, 106, 244, 0.35) 0%, rgba(34, 211, 238, 0.15) 50%, transparent 70%);
  filter: blur(40px);
  animation: pulse-halo 8s ease-in-out infinite alternate;
}

@media (min-width: 640px) {
  .stage-halo {
    width: 380px;
    height: 380px;
  }
}

@keyframes pulse-halo {
  0% { transform: scale(0.9) rotate(0deg); opacity: 0.7; }
  100% { transform: scale(1.15) rotate(90deg); opacity: 1; }
}

.stage-model-wrap {
  position: relative;
  z-index: 2;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-14px) rotate(2deg); }
}

.stage-logo {
  width: 200px;
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.7));
}

@media (min-width: 640px) {
  .stage-logo {
    width: 270px;
  }
}

/* Floating Glass Cards */
.float-card {
  position: absolute;
  z-index: 3;
  padding: 8px 14px;
  border-radius: 14px;
  background: var(--bg-glass-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-light);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-primary);
  animation: float-card 5s ease-in-out infinite alternate;
}

.float-card-1 {
  top: 10%;
  left: 0;
  animation-delay: 0.2s;
}

.float-card-2 {
  bottom: 8%;
  right: 0;
  animation-delay: 1.5s;
}

.float-badge-3d {
  position: absolute;
  bottom: 22%;
  left: 5%;
  z-index: 3;
  padding: 4px 10px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--cyan-500), #0891b2);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow: 0 4px 14px var(--cyan-glow-strong);
}

@keyframes float-card {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}

.float-card-icon {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(166, 106, 244, 0.2);
  color: var(--violet-400);
}

.float-card-icon.cyan {
  background: rgba(34, 211, 238, 0.2);
  color: var(--cyan-400);
}

.float-card-text small {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.float-card-text strong {
  font-size: 0.82rem;
  font-weight: 600;
}

/* Final CTA Download Banner Section */
.cta-banner-card {
  border-radius: 32px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-card);
  padding: 44px 22px;
  text-align: center;
  position: relative;
  overflow: hidden;
  max-width: 820px;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .cta-banner-card {
    padding: 60px 40px;
  }
}

.cta-banner-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--violet-500), var(--cyan-400), transparent);
}

.cta-logo-wrap {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 10px 30px var(--violet-glow);
}

.cta-logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.cta-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.cta-description {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 540px;
  margin: 0 auto 30px;
  line-height: 1.6;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

/* Sections Styling */
.section {
  padding: 60px 0;
  position: relative;
}

@media (min-width: 768px) {
  .section {
    padding: 80px 0;
  }
}

.section-heading {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 40px;
}

@media (min-width: 768px) {
  .section-heading {
    margin-bottom: 50px;
  }
}

.kicker {
  display: inline-block;
  text-transform: uppercase;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--violet-400);
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

@media (min-width: 640px) {
  .section-desc {
    font-size: 1.05rem;
  }
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

@media (min-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  border-radius: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-card);
  padding: 28px 24px;
  position: relative;
  transition: all 0.3s var(--ease-out);
  overflow: hidden;
}

.feature-card:hover {
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: 0 20px 45px -10px rgba(0, 0, 0, 0.7);
}

.feature-card-glow {
  position: absolute;
  top: -40px;
  right: -40px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--violet-glow) 0%, transparent 70%);
  pointer-events: none;
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: rgba(166, 106, 244, 0.14);
  color: var(--violet-400);
  border: 1px solid var(--border-violet);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon-box.cyan {
  background: rgba(34, 211, 238, 0.12);
  color: var(--cyan-400);
  border-color: rgba(34, 211, 238, 0.3);
}

.feature-icon-box.amber {
  background: rgba(251, 191, 36, 0.12);
  color: var(--amber-400);
  border-color: rgba(251, 191, 36, 0.3);
}

.feature-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* 3D Controls Showcase Section */
.controls-showcase {
  border-radius: 32px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-card);
  padding: 32px 20px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

@media (min-width: 640px) {
  .controls-showcase {
    padding: 44px 32px;
  }
}

@media (min-width: 900px) {
  .controls-showcase {
    grid-template-columns: 1fr 1fr;
    padding: 56px 48px;
    gap: 60px;
  }
}

.controls-copy h2 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 14px;
}

@media (min-width: 640px) {
  .controls-copy h2 {
    font-size: 2.2rem;
  }
}

.controls-copy p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.controls-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

@media (min-width: 640px) {
  .controls-list {
    gap: 16px;
  }
}

.control-item {
  padding: 14px;
  border-radius: 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
}

.control-item dt {
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.control-item dd {
  font-size: 0.82rem;
  color: var(--violet-300);
}

.controls-interactive-mock {
  border-radius: 24px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  padding: 20px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mock-hud-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-hairline);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.mock-hud-controls {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 6px 0;
}

.mock-btn {
  padding: 8px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-hairline);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.mock-btn.active {
  background: var(--violet-500);
  border-color: var(--violet-400);
  color: #fff;
}

.mock-slider-wrap {
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
}

.mock-track {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  position: relative;
}

.mock-fill {
  width: 65%;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--violet-500), var(--cyan-400));
}

/* Steps Flow */
.flow-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .flow-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

.flow-step {
  padding: 28px 22px;
  border-radius: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-card);
  position: relative;
}

.flow-num {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--violet-500), var(--cyan-500));
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.flow-step h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.flow-step p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Author & Credits Section */
.author-card {
  max-width: 580px;
  margin: 0 auto 50px;
  border-radius: 32px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-card);
  padding: 36px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all 0.3s var(--ease-out);
}

@media (min-width: 640px) {
  .author-card {
    padding: 44px 36px;
    margin-bottom: 60px;
  }
}

.author-card:hover {
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.7), 0 0 30px var(--violet-glow);
}

.author-avatar-wrap {
  position: relative;
  width: 104px;
  height: 104px;
  margin: 0 auto 18px;
}

.author-avatar-glow {
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--violet-500), var(--cyan-400));
  filter: blur(10px);
  opacity: 0.6;
}

.author-avatar {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--bg-surface);
}

.author-name {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.author-role {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--violet-300);
  margin-bottom: 12px;
}

.author-bio {
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.65;
  margin-bottom: 22px;
  max-width: 440px;
  margin-inline: auto;
}

.author-socials {
  display: flex;
  justify-content: center;
  gap: 14px;
}

.author-social-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-hairline);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.author-social-btn:hover {
  background: var(--violet-500);
  color: #fff;
  border-color: var(--violet-400);
  transform: translateY(-2px);
}

.credits-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .credits-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
}

.credits-card {
  border-radius: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-card);
  padding: 28px 22px;
  transition: all 0.3s var(--ease-out);
}

@media (min-width: 640px) {
  .credits-card {
    padding: 32px 28px;
  }
}

.credits-card:hover {
  border-color: var(--border-light);
  transform: translateY(-3px);
}

.credits-card h3 {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.credits-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 12px;
}

.credits-card a {
  color: var(--violet-300);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.credits-card a:hover {
  color: var(--cyan-300);
}

.credits-subtext {
  font-size: 0.82rem !important;
  color: var(--text-muted) !important;
  line-height: 1.6 !important;
  margin-bottom: 0 !important;
}

/* FAQ Accordion */
.faq-grid {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-card {
  border-radius: 18px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: all 0.25s var(--ease-out);
}

.faq-card:hover {
  border-color: var(--border-light);
}

.faq-summary {
  padding: 18px 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  user-select: none;
  min-height: 52px;
}

@media (min-width: 640px) {
  .faq-summary {
    padding: 20px 24px;
    font-size: 1.05rem;
  }
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.25s ease;
  color: var(--violet-400);
  flex-shrink: 0;
  margin-left: 12px;
}

details[open] .faq-icon {
  transform: rotate(180deg);
}

.faq-content {
  padding: 0 20px 18px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
}

@media (min-width: 640px) {
  .faq-content {
    padding: 0 24px 20px;
    font-size: 0.94rem;
  }
}

.faq-content a {
  color: var(--cyan-400);
  text-decoration: underline;
}

/* Footer */
.site-footer {
  padding: 50px 0 35px;
  border-top: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  position: relative;
  z-index: 1;
}

@media (min-width: 768px) {
  .site-footer {
    padding: 60px 0 40px;
  }
}

.footer-top {
  display: flex;
  flex-direction: column;
  gap: 32px;
  margin-bottom: 36px;
}

@media (min-width: 768px) {
  .footer-top {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.footer-brand {
  max-width: 320px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-top: 12px;
}

.footer-links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 32px 48px;
}

@media (min-width: 640px) {
  .footer-links-grid {
    gap: 40px 60px;
  }
}

.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.88rem;
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: var(--violet-300);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-hairline);
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-dim);
  text-align: center;
}

@media (min-width: 680px) {
  .footer-bottom {
    flex-direction: row;
    text-align: left;
  }
}

.footer-bottom a {
  color: var(--text-secondary);
}

.footer-bottom a:hover {
  color: var(--text-primary);
}