/* ============================================
   AgentSocialBench Website - Complete Stylesheet
   ============================================ */

/* ------ Theme Custom Properties ------ */

:root[data-theme="dark"] {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16162a;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-primary: #818cf8;
  --accent-secondary: #6366f1;
  --accent-glow: rgba(129, 140, 248, 0.3);
  --danger: #ef4444;
  --danger-glow: rgba(239, 68, 68, 0.3);
  --success: #22c55e;
  --success-glow: rgba(34, 197, 94, 0.3);
  --border: rgba(255, 255, 255, 0.08);
  --nav-bg: rgba(15, 15, 26, 0.85);
  --phone-bg: #000000;
  --phone-chat-bg: #1c1c1e;
}

:root[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent-primary: #6366f1;
  --accent-secondary: #4f46e5;
  --accent-glow: rgba(99, 102, 241, 0.2);
  --danger: #dc2626;
  --danger-glow: rgba(220, 38, 38, 0.2);
  --success: #16a34a;
  --success-glow: rgba(22, 163, 74, 0.2);
  --border: rgba(0, 0, 0, 0.08);
  --nav-bg: rgba(248, 250, 252, 0.85);
  --phone-bg: #000000;
  --phone-chat-bg: #1c1c1e;
}

/* ------ Base Reset ------ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

/* ------ Grain Overlay ------ */

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  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");
}

/* ------ Navigation ------ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--accent-primary);
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem 0.6rem;
  font-size: 1.2rem;
  cursor: pointer;
  transition: border-color 0.2s ease;
  line-height: 1;
}

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

/* ------ Hero Section ------ */

#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding: 6rem 2rem 4rem;
}

.hero-mesh {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}

.blob-1 {
  width: 400px;
  height: 400px;
  background: #818cf8;
  top: -100px;
  left: -100px;
  animation: float1 15s ease-in-out infinite;
}

.blob-2 {
  width: 350px;
  height: 350px;
  background: #6366f1;
  bottom: -50px;
  right: -50px;
  animation: float2 20s ease-in-out infinite;
}

.blob-3 {
  width: 300px;
  height: 300px;
  background: #a78bfa;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: float3 18s ease-in-out infinite;
}

@keyframes float1 {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(60px, 40px); }
  66% { transform: translate(-30px, 70px); }
}

@keyframes float2 {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(-50px, -30px); }
  66% { transform: translate(40px, -60px); }
}

@keyframes float3 {
  0%, 100% { transform: translate(-50%, -50%); }
  33% { transform: translate(-40%, -60%); }
  66% { transform: translate(-60%, -40%); }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.gradient-text {
  background: linear-gradient(135deg, #818cf8, #a78bfa, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -1px;
  max-width: 900px;
  margin: 0 auto;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 1.5rem auto;
  line-height: 1.6;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  justify-content: center;
  margin: 2.5rem 0;
  flex-wrap: wrap;
}

.hero-figures {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  margin: 2rem auto;
  max-width: 900px;
}

.hero-img {
  width: 100%;
  max-width: 850px;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

.stat {
  padding: 0.5rem 1rem;
}

.stat-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent-primary);
  display: block;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, #818cf8, #6366f1);
  color: white;
  border: none;
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
  box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-secondary {
  border: 1px solid var(--border);
  color: var(--text-primary);
  background: transparent;
}

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

/* ------ Shared Section Styles ------ */

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 5rem 0;
}

.section-header {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 800;
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: -0.5px;
}

.section-desc {
  text-align: center;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 3rem;
  font-size: 1.05rem;
  line-height: 1.6;
}

/* ------ Scroll Animations ------ */

.animate-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ------ Overview Section ------ */

.overview-figure {
  text-align: center;
  margin-bottom: 3rem;
}

.overview-figure img {
  width: 100%;
  max-width: 900px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

/* ------ Domain Cards ------ */

.domain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.domain-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.domain-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
}

.domain-card svg {
  width: 40px;
  height: 40px;
  margin-bottom: 0.75rem;
}

.domain-card svg path,
.domain-card svg line,
.domain-card svg polyline,
.domain-card svg rect,
.domain-card svg circle {
  stroke: var(--accent-primary);
}

.domain-name {
  font-weight: 700;
  margin-bottom: 0.25rem;
  font-size: 0.95rem;
}

.domain-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ============================================
   iPhone Mockup & iMessage Chat Demo
   ============================================ */

.phone-demo-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

/* Demo Tab System */
.demo-tabs {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.demo-tab {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: 0.45rem 1.2rem;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.demo-tab:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.demo-tab.active {
  background: linear-gradient(135deg, #818cf8, #6366f1);
  color: white;
  border-color: transparent;
  box-shadow: 0 2px 10px var(--accent-glow);
}

/* Demo Panels */
.demo-panel {
  display: none;
}

.demo-panel.active {
  display: block;
}

.iphone-frame {
  width: 375px;
  max-width: 100%;
  background: var(--phone-bg);
  border-radius: 48px;
  position: relative;
  overflow: hidden;
  box-shadow:
    0 0 0 2px #2a2a2e,
    0 0 0 6px #1a1a1e,
    0 0 0 8px #3a3a3e,
    0 20px 60px rgba(0, 0, 0, 0.5);
  padding-bottom: 20px;
}

/* Notch */
.iphone-notch {
  width: 126px;
  height: 34px;
  background: #000;
  border-radius: 0 0 20px 20px;
  margin: 0 auto;
  position: relative;
  z-index: 10;
}

/* Status bar */
.iphone-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  height: 20px;
  margin-top: -10px;
  position: relative;
  z-index: 5;
}

.status-time {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
}

.status-icons {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #fff;
}

/* Chat header */
.chat-header {
  display: flex;
  align-items: center;
  padding: 10px 16px 12px;
  background: rgba(28, 28, 30, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.chat-header-back {
  color: #0a84ff;
  font-size: 28px;
  font-weight: 300;
  margin-right: 8px;
  line-height: 1;
}

.chat-header-info {
  flex: 1;
  text-align: center;
  margin-right: 20px;
}

.chat-header-avatars {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin-bottom: 2px;
}

.mini-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  color: white;
}

.chat-header-title {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
}

.chat-header-subtitle {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.5);
}

/* iMessage body */
.imessage-body {
  padding: 12px 16px 16px;
  background: var(--phone-chat-bg);
  min-height: 380px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.imessage-date {
  text-align: center;
  font-size: 11px;
  color: rgba(255, 255, 255, 0.35);
  margin-bottom: 4px;
}

.imessage-row {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  max-width: 92%;
}

.imessage-row.left {
  align-self: flex-start;
}

.imessage-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
}

.imessage-col {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.imessage-sender {
  font-size: 11px;
  font-weight: 600;
  padding-left: 12px;
}

.imessage-bubble {
  padding: 10px 14px;
  border-radius: 18px;
  font-size: 14px;
  line-height: 1.4;
  color: #fff;
  position: relative;
  word-wrap: break-word;
}

.bubble-blue {
  background: #0a84ff;
  border-bottom-left-radius: 4px;
}

.bubble-green {
  background: #30b840;
  border-bottom-left-radius: 4px;
}

.bubble-purple {
  background: #8944c6;
  border-bottom-left-radius: 4px;
}

.bubble-orange {
  background: #d35400;
  border-bottom-left-radius: 4px;
}

/* Leak highlight */
.leak-bubble {
  border: 2px solid #ef4444;
  box-shadow:
    0 0 12px rgba(239, 68, 68, 0.4),
    0 0 24px rgba(239, 68, 68, 0.15);
  background: linear-gradient(135deg, #d35400, #c0392b);
  position: relative;
}

.leak-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: #ef4444;
  color: white;
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 3px 8px;
  border-radius: 4px;
  position: absolute;
  top: -10px;
  right: 8px;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.5);
  animation: pulse-badge 2s ease-in-out infinite;
}

.leak-badge::before {
  content: "\26A0\FE0F";
  font-size: 10px;
}

@keyframes pulse-badge {
  0%, 100% { box-shadow: 0 2px 8px rgba(239, 68, 68, 0.5); }
  50% { box-shadow: 0 2px 16px rgba(239, 68, 68, 0.8); }
}

/* Leak callout */
.leak-callout {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 20px;
  margin: 0 16px 8px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 12px;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.8);
}

.leak-callout svg {
  flex-shrink: 0;
  color: #ef4444;
  margin-top: 1px;
}

/* Home indicator */
.iphone-home-indicator {
  width: 134px;
  height: 5px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 3px;
  margin: 12px auto 0;
}

/* ============================================
   Leaderboard
   ============================================ */

.leaderboard-wrapper {
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  min-width: 800px;
}

.leaderboard-table thead {
  position: sticky;
  top: 0;
  z-index: 2;
}

.leaderboard-table th {
  background: var(--bg-secondary);
  padding: 0.85rem 0.75rem;
  font-weight: 700;
  text-align: center;
  font-size: 0.82rem;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
  color: var(--text-primary);
}

.leaderboard-table th.col-model {
  text-align: left;
  padding-left: 1.25rem;
}

.arrow-down::after {
  content: "\2193";
  margin-left: 2px;
  opacity: 0.5;
  font-size: 0.75rem;
}

.arrow-up::after {
  content: "\2191";
  margin-left: 2px;
  opacity: 0.5;
  font-size: 0.75rem;
}

.leaderboard-table td {
  padding: 0.7rem 0.75rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
}

.leaderboard-table td.model-name {
  text-align: left;
  font-weight: 600;
  padding-left: 1.25rem;
  white-space: nowrap;
}

.leaderboard-table tbody tr {
  transition: background 0.15s ease;
}

.leaderboard-table tbody tr:hover {
  background: var(--bg-secondary);
}

.cell-best {
  font-weight: 800;
  color: var(--accent-primary);
}

/* Metric explanations */
.metric-explanations {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.metric-explain-group h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.metric-explain {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

.metric-tag {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-weight: 700;
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 4px;
  margin-right: 0.4rem;
  display: inline-block;
}

.tag-leak {
  background: var(--danger-glow);
  color: var(--danger);
}

.tag-util {
  background: var(--success-glow);
  color: var(--success);
}

/* ============================================
   Benchmark Categories
   ============================================ */

.category-group {
  margin-bottom: 3rem;
}

.category-group-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  padding-left: 0.25rem;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

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

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.category-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
}

.category-code {
  display: inline-block;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-weight: 800;
  font-size: 0.8rem;
  background: var(--accent-glow);
  color: var(--accent-primary);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 0.75rem;
  letter-spacing: 1px;
}

.code-mp {
  background: rgba(167, 139, 250, 0.2);
  color: #a78bfa;
}

.category-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.category-count {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.category-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ============================================
   Key Findings
   ============================================ */

.findings-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.finding-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.finding-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--danger), var(--accent-primary));
}

.finding-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
}

.finding-icon {
  margin-bottom: 1rem;
}

.finding-icon svg path,
.finding-icon svg line,
.finding-icon svg circle {
  stroke: var(--accent-primary);
}

.finding-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.finding-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   Comparison Table
   ============================================ */

.comparison-wrapper {
  max-width: 900px;
  margin: 0 auto;
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
}

.comparison-table th {
  background: var(--bg-secondary);
  padding: 0.85rem 1rem;
  font-weight: 700;
  text-align: center;
  font-size: 0.85rem;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}

.comparison-table th:first-child {
  text-align: left;
}

.comparison-table th.highlight-col {
  color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.08);
}

.comparison-table td {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  text-align: center;
}

.comparison-table td:first-child {
  text-align: left;
  font-weight: 500;
}

.comparison-table td.highlight-col {
  background: rgba(99, 102, 241, 0.04);
}

.comparison-table tr:hover {
  background: var(--bg-secondary);
}

.check {
  color: var(--success);
  font-weight: 700;
  font-size: 1.1rem;
}

.cross {
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* ============================================
   Citation
   ============================================ */

.citation-block {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.cite-block {
  background: var(--bg-secondary);
  padding: 1.25rem;
  border-radius: 10px;
  font-size: 0.8rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  margin-bottom: 1rem;
  text-align: left;
}

.cite-block code {
  color: var(--text-secondary);
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  white-space: pre;
}

.copy-btn {
  background: var(--accent-primary);
  color: white;
  border: none;
  padding: 0.6rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.85rem;
  font-family: inherit;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.copy-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* ============================================
   Footer
   ============================================ */

#footer {
  background: var(--bg-secondary);
  padding: 4rem 0 2rem;
  margin-top: 2rem;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent-primary);
  margin-bottom: 0.75rem;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.footer-links h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
  .category-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav {
    padding: 0.75rem 1rem;
  }

  .nav-links {
    gap: 1rem;
    font-size: 0.8rem;
  }

  .hero-stats {
    gap: 1rem;
  }

  .stat-num {
    font-size: 2rem;
  }

  .domain-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }

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

  .category-grid-4 {
    grid-template-columns: 1fr;
  }

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

  .metric-explanations {
    grid-template-columns: 1fr;
  }

  .iphone-frame {
    width: 340px;
    border-radius: 40px;
  }

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

@media (max-width: 480px) {
  .nav-links {
    display: none;
  }

  .hero-ctas {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 260px;
    text-align: center;
  }

  .iphone-frame {
    width: 300px;
    border-radius: 36px;
  }

  .imessage-bubble {
    font-size: 13px;
  }
}