/* ═══════════════════════════════════════════
   TUNNEL 北欧 — 模块化猫隧道
   北欧侘寂 · 大地色调 · 极简电影感
   ═══════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');

/* ── Reset & Base ── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Palette */
  --sand: #D4C5B0;
  --sand-light: #E8DDD0;
  --moss: #8B7E6A;
  --moss-dark: #6B5F4E;
  --charcoal: #2C2823;
  --copper: #C9A87C;
  --sage: #A8B5A0;
  --cream: #F5F0E8;
  --white: #FAF8F4;
  --black: #1A1815;

  /* Typography */
  --display: 'Times New Roman', 'Georgia', 'Palatino', serif;
  --body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
  --space-2xl: 12rem;

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-slow: 1.2s;
  --duration-med: 0.6s;
}

html {
  scroll-behavior: smooth;
  background: var(--cream);
  color: var(--charcoal);
  font-family: var(--body);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
}

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

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

/* ── Grain Overlay ── */
.grain-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* ── Navigation ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: var(--space-md) var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--duration-med) var(--ease-out);
  mix-blend-mode: difference;
  color: var(--white);
}

nav.scrolled {
  background: rgba(250, 248, 244, 0.92);
  backdrop-filter: blur(20px) saturate(1.2);
  color: var(--charcoal);
  padding: var(--space-sm) var(--space-lg);
  mix-blend-mode: normal;
  box-shadow: 0 1px 0 rgba(44, 40, 35, 0.06);
}

nav .logo {
  font-family: var(--display);
  font-size: 1.4rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

nav .nav-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.04em;
}

nav .nav-links a {
  position: relative;
  padding: 0.3rem 0;
  transition: opacity var(--duration-med) var(--ease-out);
}

nav .nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width var(--duration-med) var(--ease-out);
}

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

.nav-cta {
  background: var(--copper);
  color: var(--white) !important;
  padding: 0.5rem 1.5rem !important;
  border-radius: 2px;
  font-weight: 500;
  transition: all var(--duration-med) var(--ease-out) !important;
}

.nav-cta:hover {
  background: var(--charcoal) !important;
  transform: translateY(-1px);
}

.nav-cta::after { display: none !important; }

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: currentColor;
  transition: all var(--duration-med) var(--ease-out);
}

/* ── Hero ── */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 700px;
  overflow: hidden;
  background: var(--charcoal);
}

.hero-video-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.hero-video-container video,
.hero-video-container .video-fallback {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-video-container .video-fallback {
  background: linear-gradient(135deg, #2C2823 0%, #4A4036 40%, #6B5F4E 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-video-container .video-fallback img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.6;
}

/* Hero overlay gradient */
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 60%;
  background: linear-gradient(to top, rgba(44,40,35,0.7) 0%, transparent 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 10;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-2xl) var(--space-lg) var(--space-xl);
  color: var(--white);
  max-width: 1400px;
  margin: 0 auto;
}

.hero-tag {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 400;
  color: var(--copper);
  margin-bottom: var(--space-sm);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s var(--ease-out) 0.3s forwards;
}

.hero-title {
  font-family: var(--display);
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.02em;
  max-width: 900px;
  opacity: 0;
  transform: translateY(40px);
  animation: fadeUp 1s var(--ease-out) 0.6s forwards;
}

.hero-sub {
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  font-weight: 300;
  color: rgba(255,255,255,0.7);
  margin-top: var(--space-md);
  max-width: 500px;
  line-height: 1.6;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 1s var(--ease-out) 0.9s forwards;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  padding: 1rem 2.5rem;
  background: var(--copper);
  color: var(--white);
  border: none;
  border-radius: 2px;
  font-family: var(--body);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: all var(--duration-med) var(--ease-out);
  width: fit-content;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 1s var(--ease-out) 1.1s forwards;
}

.hero-cta:hover {
  background: var(--white);
  color: var(--charcoal);
  transform: translateY(-2px);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.4);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: fadeIn 2s var(--ease-out) 2s forwards;
  opacity: 0;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.4), transparent);
  animation: scrollPulse 2.5s infinite;
}

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  to { opacity: 1; }
}
@keyframes scrollPulse {
  0%, 100% { transform: scaleY(0.5); opacity: 0.5; }
  50% { transform: scaleY(1); opacity: 1; }
}

/* ── Section base ── */
section {
  padding: var(--space-xl) var(--space-lg);
  max-width: 1400px;
  margin: 0 auto;
}

.section-label {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--moss);
  font-weight: 400;
  margin-bottom: var(--space-sm);
}

.section-title {
  font-family: var(--display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--charcoal);
}

.section-sub {
  color: var(--moss);
  max-width: 500px;
  margin-top: var(--space-sm);
  font-size: 1rem;
  line-height: 1.7;
}

/* ── Modules Section (Asymmetric Grid) ── */
.modules {
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

.modules-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
  align-items: end;
}

.modules-header .section-title {
  max-width: 600px;
}

.modules-header .section-sub {
  justify-self: end;
  text-align: right;
}

.modules-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1px;
  background: rgba(44,40,35,0.08);
}

.module-card {
  position: relative;
  overflow: hidden;
  background: var(--white);
  padding: 0;
  cursor: pointer;
  transition: all var(--duration-med) var(--ease-out);
}

.module-card .card-inner {
  padding: var(--space-lg) var(--space-md);
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 280px;
  position: relative;
}

.module-card .card-bg {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

.module-card:hover .card-bg {
  transform: scale(1.05);
}

.module-card .card-overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: linear-gradient(to top, rgba(44,40,35,0.6) 0%, transparent 60%);
  pointer-events: none;
}

.module-card .card-label {
  position: relative;
  z-index: 2;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 0.5rem;
}

.module-card .card-title {
  position: relative;
  z-index: 2;
  font-family: var(--display);
  font-size: 1.4rem;
  color: var(--white);
  font-weight: 400;
}

.module-card .card-desc {
  position: relative;
  z-index: 2;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  margin-top: 0.3rem;
  max-width: 220px;
}

/* Grid spans */
.module-card.wide { grid-column: span 6; }
.module-card.medium { grid-column: span 4; }
.module-card.narrow { grid-column: span 3; }
.module-card.tall { grid-row: span 2; }

.module-card.card-sand .card-inner { background: var(--sand-light); }
.module-card.card-sand .card-title { color: var(--charcoal); }
.module-card.card-sand .card-desc { color: var(--moss-dark); }
.module-card.card-sand .card-label { color: var(--moss); }
.module-card.card-sand .card-overlay { background: none; }

.module-card.card-moss .card-inner { background: var(--moss); }
.module-card.card-charcoal .card-inner { background: var(--charcoal); }
.module-card.card-sage .card-inner { background: var(--sage); }

/* ── 3D Configurator Section ── */
.configurator-section {
  background: var(--charcoal);
  color: var(--white);
  max-width: 100%;
  padding: var(--space-2xl) var(--space-lg);
  position: relative;
  overflow: hidden;
}

.configurator-inner {
  max-width: 1400px;
  margin: 0 auto;
}

.configurator-section .section-label {
  color: var(--copper);
}

.configurator-section .section-title {
  color: var(--white);
}

.configurator-section .section-sub {
  color: rgba(255,255,255,0.5);
}

.configurator-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
  align-items: start;
}

.configurator-3d {
  position: relative;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 4px;
  aspect-ratio: 4/3;
  min-height: 400px;
  overflow: hidden;
}

#three-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.configurator-3d-hint {
  position: absolute;
  bottom: var(--space-sm);
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: rgba(255,255,255,0.25);
  letter-spacing: 0.05em;
  pointer-events: none;
}

.configurator-panel {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 4px;
  padding: var(--space-md);
}

.configurator-panel h3 {
  font-family: var(--display);
  font-size: 1.2rem;
  font-weight: 400;
  margin-bottom: var(--space-md);
  color: var(--sand);
}

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

.module-option {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.7rem 1rem;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 2px;
  cursor: pointer;
  transition: all var(--duration-med) var(--ease-out);
  background: transparent;
  color: rgba(255,255,255,0.6);
  font-family: var(--body);
  font-size: 0.85rem;
  font-weight: 300;
}

.module-option:hover {
  border-color: var(--copper);
  color: var(--white);
  background: rgba(201,168,124,0.08);
}

.module-option.active {
  border-color: var(--copper);
  color: var(--white);
  background: rgba(201,168,124,0.12);
}

.module-option .icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid currentColor;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  opacity: 0.6;
}

.config-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.config-actions button {
  flex: 1;
  padding: 0.8rem;
  border: 1px solid rgba(255,255,255,0.15);
  background: transparent;
  color: var(--white);
  font-family: var(--body);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: all var(--duration-med) var(--ease-out);
  border-radius: 2px;
}

.config-actions .btn-primary {
  background: var(--copper);
  border-color: var(--copper);
}

.config-actions .btn-primary:hover {
  background: transparent;
  border-color: var(--white);
}

.config-actions .btn-outline:hover {
  border-color: var(--copper);
  color: var(--copper);
}

/* ── Story Section ── */
.story {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

.story-image {
  position: relative;
  background: var(--sand-light);
  aspect-ratio: 3/4;
  border-radius: 2px;
  overflow: hidden;
}

.story-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.story-image::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  box-shadow: inset 0 0 80px rgba(44,40,35,0.15);
  pointer-events: none;
}

.story-content {
  padding: var(--space-lg) 0;
}

.story-content p {
  margin-top: var(--space-md);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--moss-dark);
}

.story-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.story-value {
  border-top: 1px solid rgba(44,40,35,0.1);
  padding-top: var(--space-sm);
}

.story-value .num {
  font-family: var(--display);
  font-size: 2rem;
  color: var(--copper);
}

.story-value .label {
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--moss);
  margin-top: 0.2rem;
}

/* ── Testimonials ── */
.testimonials {
  background: var(--cream);
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.testimonial-card {
  background: var(--white);
  padding: var(--space-lg) var(--space-md);
  border-radius: 2px;
  position: relative;
}

.testimonial-card::before {
  content: '"';
  font-family: var(--display);
  font-size: 4rem;
  position: absolute;
  top: 0.5rem;
  left: 1rem;
  color: var(--sand);
  line-height: 1;
  opacity: 0.5;
}

.testimonial-card blockquote {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--charcoal);
  font-weight: 300;
}

.testimonial-card .author {
  margin-top: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.testimonial-card .author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--sand-light);
  flex-shrink: 0;
}

.testimonial-card .author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.testimonial-card .author-info .name {
  font-size: 0.85rem;
  font-weight: 500;
}

.testimonial-card .author-info .role {
  font-size: 0.75rem;
  color: var(--moss);
}

/* ── CTA Section ── */
.cta-section {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  max-width: 800px;
  margin: 0 auto;
}

.cta-section .section-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
}

.cta-section .section-sub {
  margin: var(--space-md) auto 0;
}

.cta-buttons {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

.btn {
  padding: 1rem 2.5rem;
  border: none;
  border-radius: 2px;
  font-family: var(--body);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: all var(--duration-med) var(--ease-out);
}

.btn-primary-solid {
  background: var(--charcoal);
  color: var(--white);
}

.btn-primary-solid:hover {
  background: var(--copper);
  transform: translateY(-2px);
}

.btn-outline-dark {
  background: transparent;
  color: var(--charcoal);
  border: 1px solid var(--charcoal);
}

.btn-outline-dark:hover {
  background: var(--charcoal);
  color: var(--white);
}

.trust-badges {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

.trust-badge {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.75rem;
  color: var(--moss);
  letter-spacing: 0.04em;
}

.trust-badge .icon-svg {
  width: 20px;
  height: 20px;
  opacity: 0.5;
}

/* ── Footer ── */
footer {
  border-top: 1px solid rgba(44,40,35,0.08);
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  max-width: 1400px;
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

footer .logo {
  font-family: var(--display);
  font-size: 1.2rem;
  letter-spacing: 0.06em;
  color: var(--charcoal);
}

footer .brand-desc {
  font-size: 0.85rem;
  color: var(--moss);
  margin-top: var(--space-sm);
  max-width: 280px;
  line-height: 1.6;
}

footer h4 {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--moss);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

footer ul {
  list-style: none;
}

footer ul li {
  margin-bottom: 0.5rem;
}

footer ul a {
  font-size: 0.85rem;
  color: var(--moss-dark);
  transition: color var(--duration-med) var(--ease-out);
}

footer ul a:hover {
  color: var(--charcoal);
}

.footer-bottom {
  border-top: 1px solid rgba(44,40,35,0.06);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--moss);
}

.social-links {
  display: flex;
  gap: var(--space-sm);
}

.social-links a {
  width: 36px;
  height: 36px;
  border: 1px solid rgba(44,40,35,0.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--moss);
  transition: all var(--duration-med) var(--ease-out);
}

.social-links a:hover {
  border-color: var(--copper);
  color: var(--copper);
  transform: translateY(-2px);
}

/* ── Reveal Animation ── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all var(--duration-slow) var(--ease-out);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── Mobile ── */
@media (max-width: 1024px) {
  .configurator-layout {
    grid-template-columns: 1fr;
  }
  .modules-grid {
    grid-template-columns: repeat(6, 1fr);
  }
  .module-card.wide { grid-column: span 6; }
  .module-card.medium { grid-column: span 3; }
  .module-card.narrow { grid-column: span 3; }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .story {
    grid-template-columns: 1fr;
  }
  .testimonials-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --space-lg: 2rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
  }

  section { padding: var(--space-xl) var(--space-md); }

  nav { padding: var(--space-sm) var(--space-md); }
  nav.scrolled { padding: var(--space-xs) var(--space-md); }

  nav .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    height: 100vh;
    background: var(--cream);
    flex-direction: column;
    padding: var(--space-xl) var(--space-md);
    gap: var(--space-md);
    transition: right var(--duration-med) var(--ease-out);
    color: var(--charcoal);
    mix-blend-mode: normal;
    z-index: 100;
  }

  nav .nav-links.open {
    right: 0;
  }

  .menu-toggle {
    display: flex;
    z-index: 101;
  }

  .hero-content { padding: var(--space-xl) var(--space-md) var(--space-lg); }

  .modules-header {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .modules-header .section-sub { text-align: left; }

  .modules-grid { grid-template-columns: 1fr 1fr; }
  .module-card.wide,
  .module-card.medium,
  .module-card.narrow { grid-column: span 2; }
  .module-card.tall { grid-row: span 1; }

  .testimonials-grid { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr; }

  .footer-bottom { flex-direction: column; gap: var(--space-sm); text-align: center; }
}

@media (max-width: 480px) {
  .modules-grid { grid-template-columns: 1fr; }
  .module-card.wide,
  .module-card.medium,
  .module-card.narrow { grid-column: span 1; }

  .story-values { grid-template-columns: 1fr; }
}