/* ==============================================================================
   PROJECT ISHITA GOYAL — ANTHROPIC-INSPIRED EDITORIAL LANDING PAGE STYLESHEET
   Aesthetic: Warm Ivory, Serif Headings, Charcoal Contrast, Terracotta Accents
   ============================================================================== */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&family=Newsreader:ital,opsz,wght@0,6..72,300..700;1,6..72,300..700&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
  /* Colors - Anthropic Signature Warm Ivory Palette */
  --bg-primary: #FAF9F5;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFFFF;
  --bg-subtle: #F3F1EA;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FCFBF9;
  
  --border-subtle: rgba(20, 20, 19, 0.08);
  --border-medium: rgba(20, 20, 19, 0.16);
  --border-strong: rgba(20, 20, 19, 0.32);

  --text-primary: #141413;
  --text-secondary: #585753;
  --text-muted: #84837E;
  --text-inverse: #FAF9F5;

  /* Terracotta & Earth Tones */
  --accent-terracotta: #CC785C;
  --accent-terracotta-hover: #BA684D;
  --accent-peach: #FDF5F2;
  --accent-border: #E8C8BC;

  /* Olive & Sage (Secondary accents) */
  --accent-sage: #526B5B;
  --accent-sage-subtle: #EDF3EF;

  /* Status Tokens */
  --status-safe-bg: #EAF4EE;
  --status-safe-text: #235B37;
  --status-warn-bg: #FCF4E6;
  --status-warn-text: #8C5B17;
  --status-danger-bg: #FDF0ED;
  --status-danger-text: #963524;

  /* Typography */
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  /* Layout */
  --max-width: 1240px;
  --header-height: 72px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-card: 0 4px 20px -4px rgba(20, 20, 19, 0.06);
  --shadow-hover: 0 12px 32px -6px rgba(20, 20, 19, 0.1);
  --shadow-modal: 0 24px 64px -12px rgba(20, 20, 19, 0.24);

  /* Transitions */
  --transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --bg-primary: #121211;
  --bg-surface: #1A1A19;
  --bg-surface-elevated: #222220;
  --bg-subtle: #242422;
  --bg-card: #191918;
  --bg-card-hover: #21211F;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.16);
  --border-strong: rgba(255, 255, 255, 0.32);

  --text-primary: #F4F3EE;
  --text-secondary: #AAA9A3;
  --text-muted: #72716C;
  --text-inverse: #121211;

  --accent-terracotta: #D97757;
  --accent-terracotta-hover: #E38668;
  --accent-peach: rgba(217, 119, 87, 0.14);
  --accent-border: rgba(217, 119, 87, 0.32);

  --accent-sage: #819E8C;
  --accent-sage-subtle: rgba(129, 158, 140, 0.14);

  --status-safe-bg: rgba(35, 91, 55, 0.25);
  --status-safe-text: #78C694;
  --status-warn-bg: rgba(140, 91, 23, 0.25);
  --status-warn-text: #E5B472;
  --status-danger-bg: rgba(150, 53, 36, 0.25);
  --status-danger-text: #EE8A76;

  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-card: 0 4px 20px -4px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 12px 32px -6px rgba(0, 0, 0, 0.6);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  transition: background-color 0.25s ease, color 0.25s ease;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

/* Typography Helpers */
.font-serif { font-family: var(--font-serif); }
.font-sans { font-family: var(--font-sans); }
.font-mono { font-family: var(--font-mono); }

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-terracotta);
  margin-bottom: 1rem;
}

.kicker::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-terracotta);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

@media (max-width: 768px) {
  .container {
    padding: 0 1.25rem;
  }
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(250, 249, 245, 0.90);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

[data-theme="dark"] .header {
  background-color: rgba(18, 18, 17, 0.90);
}

.nav {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2.5rem;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 3.5vw, 3rem);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo {
  font-family: var(--font-sans);
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.status-pulse-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #2da44e;
  box-shadow: 0 0 0 0 rgba(45, 164, 78, 0.6);
  animation: pulseGreen 2.2s infinite;
}

@keyframes pulseGreen {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(45, 164, 78, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 7px rgba(45, 164, 78, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(45, 164, 78, 0); }
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 1.8vw, 1.6rem);
  list-style: none;
}

.nav-link,
.nav-link-dropdown-toggle {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: 1px solid transparent;
}

.nav-link:hover,
.nav-link-dropdown-toggle:hover {
  color: var(--text-primary);
  background-color: var(--bg-subtle);
}

.nav-link.active,
.nav-link-dropdown-toggle.active {
  color: var(--text-primary);
  background-color: var(--bg-subtle);
  border-color: var(--border-subtle);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

/* Anthropic Pill Button (Try Claude replica -> Try Ishita) */
.nav-btn-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--text-primary);
  color: var(--bg-primary) !important;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.48rem 1.15rem;
  border-radius: 9999px;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 2px 8px rgba(20, 20, 19, 0.12);
  white-space: nowrap;
  border: 1px solid transparent;
}

.nav-btn-pill:hover {
  opacity: 0.92;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(20, 20, 19, 0.2);
}

.nav-btn-pill svg {
  stroke: currentColor;
  transition: transform 0.2s ease;
}

.nav-btn-pill:hover svg {
  transform: translateY(1px);
}

.theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  box-shadow: var(--shadow-subtle);
  padding: 0;
  flex-shrink: 0;
}

.theme-toggle-btn:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
  border-color: var(--border-strong);
  transform: scale(1.05);
}

.theme-toggle-btn svg {
  width: 17px;
  height: 17px;
}

.svg-icon {
  display: inline-block;
  vertical-align: middle;
  stroke: currentColor;
  flex-shrink: 0;
}

.nav-btn-demo {
  padding: 0.55rem 1.15rem;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-full);
}

.nav-btn-control {
  padding: 0.55rem 1.3rem;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px -2px rgba(20, 20, 19, 0.15);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

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

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

.btn-secondary:hover {
  background-color: var(--bg-subtle);
  border-color: var(--border-strong);
}

.btn-terracotta {
  background-color: var(--accent-terracotta);
  color: #FFFFFF;
}

.btn-terracotta:hover {
  background-color: var(--accent-terracotta-hover);
  transform: translateY(-1px);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.3rem;
  color: var(--text-primary);
  cursor: pointer;
}

/* Mobile Nav Drawer */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-primary);
  padding: 2rem;
  z-index: 99;
  flex-direction: column;
  gap: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  overflow-y: auto;
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav a {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--text-primary);
}

@media (max-width: 992px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: block; }
}

/* Hero Section */
.hero {
  padding: 5.5rem 0 4.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 4rem;
  align-items: center;
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

.hero-content h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 4.2rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero-content h1 em {
  font-style: italic;
  color: var(--accent-terracotta);
  font-weight: 400;
}

.hero-lead {
  font-size: 1.18rem;
  line-height: 1.68;
  color: var(--text-secondary);
  margin-bottom: 2.25rem;
  max-width: 620px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

@media (max-width: 640px) {
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

.stat-item .stat-number {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  line-height: 1;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.stat-item .stat-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

/* Hero Showcase Card */
.hero-showcase {
  position: relative;
}

.persona-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.persona-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.persona-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent-border);
}

.persona-meta h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 600;
}

.persona-handle {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-terracotta);
}

.persona-location {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.persona-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.persona-pill {
  font-size: 0.75rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.persona-chat-preview {
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  border: 1px solid var(--border-subtle);
}

.preview-bubble {
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.preview-bubble:last-child {
  margin-bottom: 0;
}

.preview-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Section Common */
.section {
  padding: 6rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  max-width: 760px;
  margin-bottom: 4rem;
}

.section-header h2 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 500;
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.12rem;
  line-height: 1.68;
  color: var(--text-secondary);
}

/* Pillar Grid (Anthropic Style) */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

@media (max-width: 768px) {
  .pillars-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.pillar-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.pillar-number {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-terracotta);
  margin-bottom: 1.25rem;
}

.pillar-card h3 {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 1rem;
}

.pillar-card p {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.pillar-card ul {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.25rem;
}

.pillar-card li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.pillar-card li::before {
  content: "→";
  color: var(--accent-terracotta);
  font-weight: 600;
}

/* 14-Step Pipeline Explorer */
.pipeline-layout {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 992px) {
  .pipeline-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.pipeline-steps-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  max-height: 520px;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.pipeline-step-item {
  padding: 0.9rem 1.25rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pipeline-step-item:hover, .pipeline-step-item.active {
  border-color: var(--accent-terracotta);
  background: var(--accent-peach);
}

.pipeline-step-item.active .step-title {
  color: var(--accent-terracotta);
  font-weight: 600;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.step-title {
  font-size: 0.92rem;
  color: var(--text-primary);
}

.pipeline-detail-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  box-shadow: var(--shadow-card);
  position: sticky;
  top: calc(var(--header-height) + 2rem);
}

.detail-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-terracotta);
  margin-bottom: 0.5rem;
}

.pipeline-detail-card h3 {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  margin-bottom: 1rem;
}

.pipeline-detail-card p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.code-block {
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-primary);
  overflow-x: auto;
  line-height: 1.55;
}

/* Model Matrix Table */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  box-shadow: var(--shadow-card);
}

.anthropic-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.anthropic-table th {
  background-color: var(--bg-subtle);
  padding: 1.1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

.anthropic-table td {
  padding: 1.2rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.anthropic-table tr:last-child td {
  border-bottom: none;
}

.anthropic-table tr:hover td {
  background-color: var(--bg-card-hover);
}

.model-name {
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
}

.badge-green { background: var(--status-safe-bg); color: var(--status-safe-text); }
.badge-gold { background: var(--status-warn-bg); color: var(--status-warn-text); }
.badge-terracotta { background: var(--accent-peach); color: var(--accent-terracotta); border: 1px solid var(--accent-border); }

/* Research Papers Grid */
.papers-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

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

.paper-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  cursor: pointer;
}

.paper-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.paper-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.paper-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.paper-card h3 {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 500;
  line-height: 1.35;
  margin-bottom: 0.85rem;
  color: var(--text-primary);
}

.paper-abstract {
  font-size: 0.94rem;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.paper-link {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-terracotta);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

/* Experiments & Benchmarks */
.experiments-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

@media (max-width: 992px) {
  .experiments-grid {
    grid-template-columns: 1fr;
  }
}

.exp-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-subtle);
}

.exp-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  display: inline-block;
  margin-bottom: 1rem;
}

.exp-card h4 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.exp-metric-display {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin: 1.25rem 0;
  padding: 1rem;
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
}

.exp-big-num {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent-terracotta);
  line-height: 1;
}

.exp-metric-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.3;
}

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

/* Pros and Cons Matrix */
.pros-cons-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

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

.pros-box, .cons-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 2.5rem;
}

.pros-box {
  border-top: 4px solid var(--accent-sage);
}

.cons-box {
  border-top: 4px solid var(--accent-terracotta);
}

.pros-box h3, .cons-box h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.pros-cons-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.pros-cons-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.icon-circle {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: bold;
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.pros-box .icon-circle {
  background: var(--status-safe-bg);
  color: var(--status-safe-text);
}

.cons-box .icon-circle {
  background: var(--status-warn-bg);
  color: var(--status-warn-text);
}

.pros-cons-text strong {
  display: block;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.pros-cons-text span {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Interactive Sandbox */
.sandbox-tabs {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.5rem;
}

.sandbox-tab-btn {
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.sandbox-tab-btn.active {
  color: var(--text-primary);
  background: var(--bg-subtle);
}

.sandbox-pane {
  display: none;
}

.sandbox-pane.active {
  display: block;
}

.chat-sandbox-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
}

@media (max-width: 992px) {
  .chat-sandbox-layout {
    grid-template-columns: 1fr;
  }
}

.sandbox-chat-window {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  height: 480px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.chat-messages-area {
  flex: 1;
  padding: 1.5rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.chat-msg {
  max-width: 80%;
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  line-height: 1.55;
}

.chat-msg-user {
  align-self: flex-end;
  background: var(--text-primary);
  color: var(--bg-primary);
  border-bottom-right-radius: 2px;
}

.chat-msg-ishita {
  align-self: flex-start;
  background: var(--bg-subtle);
  color: var(--text-primary);
  border-bottom-left-radius: 2px;
  border: 1px solid var(--border-subtle);
}

.chat-input-bar {
  padding: 1rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  gap: 0.75rem;
  background: var(--bg-surface);
}

.chat-input-bar input {
  flex: 1;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  outline: none;
}

.chat-input-bar input:focus {
  border-color: var(--accent-terracotta);
}

.prompt-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.suggestion-chip {
  font-size: 0.78rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  color: var(--text-secondary);
  transition: var(--transition);
}

.suggestion-chip:hover {
  border-color: var(--accent-terracotta);
  color: var(--text-primary);
}

/* Photo Lab Gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

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

.gallery-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-subtle);
  cursor: pointer;
  transition: var(--transition);
}

.gallery-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.gallery-card img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.gallery-info {
  padding: 1.25rem;
}

.gallery-info h5 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
}

.gallery-info p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

/* Modal for Research Papers */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(18, 18, 17, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-container {
  background: var(--bg-surface);
  width: 100%;
  max-width: 820px;
  max-height: 85vh;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-modal);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modalIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalIn {
  from { opacity: 0; transform: translateY(16px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
  padding: 1.75rem 2rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  line-height: 1.3;
}

.modal-close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
}

.modal-body {
  padding: 2rem;
  overflow-y: auto;
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.modal-body h4 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--text-primary);
  margin: 1.5rem 0 0.5rem;
}

.modal-body p {
  margin-bottom: 1.2rem;
}

/* Footer (Anthropic Style) */
.footer {
  padding: 5rem 0 3rem;
  background-color: var(--bg-subtle);
  border-top: 1px solid var(--border-subtle);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 4rem;
}

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand h4 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h5 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

@media (max-width: 640px) {
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
}

.status-dot-active {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #2E7D32;
  margin-right: 0.4rem;
}

/* ==============================================================================
   ANTHROPIC PARITY ENHANCEMENTS: DROPDOWNS, BANNERS, NEWSROOM & RESEARCH
   ============================================================================== */

/* 1. Spacious Header Mega-Dropdowns */
.nav-item-dropdown {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0;
}

.nav-caret {
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  color: var(--text-muted);
  flex-shrink: 0;
}

.nav-item-dropdown:hover .nav-caret,
.nav-item-dropdown.active .nav-caret {
  transform: rotate(180deg);
  color: var(--accent-terracotta);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 18px;
  box-shadow: 0 20px 48px -10px rgba(20, 20, 19, 0.12), 0 4px 16px rgba(20, 20, 19, 0.05);
  padding: 1.15rem;
  min-width: 380px;
  max-width: 440px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.22s cubic-bezier(0.16, 1, 0.3, 1), transform 0.22s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.22s;
  z-index: 1000;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}

[data-theme="dark"] .nav-dropdown-menu {
  box-shadow: 0 24px 50px -10px rgba(0, 0, 0, 0.65), 0 4px 16px rgba(0, 0, 0, 0.45);
}

/* Invisible bridge so mouse hover doesn't break between link and menu */
.nav-dropdown-menu::before {
  content: '';
  position: absolute;
  top: -18px;
  left: 0;
  right: 0;
  height: 20px;
  background: transparent;
}

.nav-item-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.25rem 0.65rem 0.75rem 0.65rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 0.65rem;
}

.dropdown-category-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-terracotta);
}

.dropdown-view-all {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.dropdown-view-all:hover {
  color: var(--text-primary);
}

.nav-dropdown-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.75rem 0.85rem;
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  margin-bottom: 0.25rem;
}

.nav-dropdown-item:hover {
  background: var(--bg-subtle);
  transform: translateX(4px);
}

.nav-dropdown-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.nav-dropdown-item:hover .nav-dropdown-icon {
  background-color: var(--accent-peach);
  border-color: var(--accent-border);
  color: var(--accent-terracotta);
  transform: scale(1.05);
}

.nav-dropdown-svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
}

.nav-dropdown-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-item-pill {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  background: var(--bg-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

.nav-item-pill.highlight {
  background: var(--accent-peach);
  color: var(--accent-terracotta);
  border-color: var(--accent-border);
}

.nav-dropdown-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  line-height: 1.42;
}

/* ==============================================================================
   REUSABLE SUBPAGE COMPONENTS (Breadcrumbs, Page Hero, Rich Grids, Math Blocks)
   ============================================================================== */

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.breadcrumbs a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}

.breadcrumbs a:hover {
  color: var(--accent-terracotta);
}

.breadcrumbs .crumb-separator {
  color: var(--border-strong);
}

.breadcrumbs .crumb-current {
  color: var(--text-primary);
  font-weight: 600;
}

.page-hero {
  padding: 5rem 0 3.75rem;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-primary);
  position: relative;
}

.page-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 4.8vw, 3.8rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
  font-weight: 500;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.page-hero-title em {
  font-style: italic;
  color: var(--accent-terracotta);
}

.page-hero-lead {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 820px;
  margin-bottom: 2.25rem;
}

.page-hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  margin-top: 2rem;
}

.spec-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.spec-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-medium);
}

.math-equation-block {
  font-family: var(--font-mono);
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent-terracotta);
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-sm);
  margin: 1.5rem 0;
  overflow-x: auto;
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.6;
}

.interactive-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-card);
  margin: 2.5rem 0;
}

.tab-nav-bar {
  display: flex;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.75rem;
  margin-bottom: 1.75rem;
  overflow-x: auto;
}

.tab-btn {
  background: none;
  border: 1px solid transparent;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: var(--bg-subtle);
}

.tab-btn.active {
  color: var(--text-primary);
  background: var(--bg-subtle);
  border-color: var(--border-subtle);
  font-weight: 600;
}

.tab-pane-content {
  display: none;
}

.tab-pane-content.active {
  display: block;
}

.copy-bibtex-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: var(--transition);
  margin-top: 0.75rem;
}

.copy-bibtex-btn:hover {
  background: var(--bg-surface);
  color: var(--accent-terracotta);
  border-color: var(--accent-border);
}

/* 2. Anthropic Signature 3-Column "Latest Releases" Banners */
.releases-section {
  padding: 2.5rem 0 4.5rem 0;
  background: var(--bg-primary);
}

.releases-heading {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 1.75rem;
}

.releases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.package-banner {
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 18px;
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s;
  cursor: pointer;
  position: relative;
}

.package-banner:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  border-color: var(--border-medium);
}

.package-banner-top h3 {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 500;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
}

.package-banner-top p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.75rem;
}

.package-banner-list {
  list-style: none;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.package-banner-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
}

.package-banner-meta-key {
  font-family: var(--font-mono);
  text-transform: uppercase;
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
}

.package-banner-meta-val {
  color: var(--text-secondary);
  font-weight: 500;
}

.package-banner-cta-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-terracotta);
  text-decoration: none;
  transition: gap 0.15s;
}

.package-banner:hover .package-banner-cta-wrap {
  gap: 0.65rem;
  color: var(--accent-terracotta-hover);
}

/* 3. Dedicated Newsroom & Blog Section */
.news-section {
  padding: 5.5rem 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.news-filter-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 2.75rem;
  flex-wrap: wrap;
}

.filter-pill {
  background: transparent;
  border: 1px solid var(--border-subtle);
  padding: 0.45rem 1.15rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.18s ease;
  user-select: none;
}

.filter-pill:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.filter-pill.active {
  background: var(--text-primary);
  color: var(--text-inverse);
  border-color: var(--text-primary);
}

.featured-news-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 2rem;
  margin-bottom: 3.5rem;
}

.featured-news-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s, border-color 0.25s;
  cursor: pointer;
}

.featured-news-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  border-color: var(--border-medium);
}

.featured-news-img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.featured-news-body {
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
}

.news-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  margin-bottom: 0.85rem;
}

.news-card-category {
  color: var(--accent-terracotta);
  font-weight: 600;
  text-transform: uppercase;
}

.news-card-date {
  color: var(--text-muted);
}

.news-card-reading-time {
  color: var(--text-muted);
  position: relative;
  padding-left: 0.75rem;
}

.news-card-reading-time::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--border-strong);
}

.featured-news-title {
  font-family: var(--font-serif);
  font-size: 1.85rem;
  font-weight: 500;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.featured-news-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.75rem;
}

.side-news-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.side-news-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 1.5rem;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.side-news-item:hover {
  transform: translateX(4px);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-subtle);
}

.side-news-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 500;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.side-news-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 4. Publication Lists & Search Box (Anthropic Research Style) */
.pub-header-bar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 2rem;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.pub-section-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 400;
  color: var(--text-primary);
}

.search-filter-box {
  position: relative;
  width: 100%;
  max-width: 380px;
}

.search-filter-input {
  width: 100%;
  padding: 0.7rem 1.2rem 0.7rem 2.6rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-filter-input:focus {
  border-color: var(--accent-terracotta);
  box-shadow: 0 0 0 3px rgba(204, 120, 92, 0.12);
}

.search-filter-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.pub-list-container {
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 2rem;
}

.pub-list-row {
  display: grid;
  grid-template-columns: 140px 180px 1fr 40px;
  align-items: center;
  padding: 1.25rem 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color 0.15s ease, padding-left 0.15s ease;
  cursor: pointer;
  text-decoration: none;
}

.pub-list-row:last-child {
  border-bottom: none;
}

.pub-list-row:hover {
  background-color: var(--bg-subtle);
  padding-left: 1.15rem;
}

.pub-row-date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.pub-row-category {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-terracotta);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pub-row-title {
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
  padding-right: 1.5rem;
  transition: color 0.15s;
}

.pub-list-row:hover .pub-row-title {
  color: var(--accent-terracotta);
}

.pub-row-arrow {
  color: var(--text-muted);
  font-size: 1.1rem;
  text-align: right;
  transition: transform 0.2s;
}

.pub-list-row:hover .pub-row-arrow {
  transform: translateX(4px);
  color: var(--accent-terracotta);
}

/* 5. Research Hero Split & Teams Bar */
.research-hero-split {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 3.5rem;
  margin-bottom: 3.5rem;
  align-items: start;
}

.research-teams-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.team-pill {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all 0.15s;
}

.team-pill:hover {
  border-color: var(--accent-terracotta);
  color: var(--accent-terracotta);
}

/* 6. Pre-Footer Banner */
.pre-footer-banner {
  background: #141413;
  color: #FAF9F5;
  border-radius: 24px;
  padding: 5rem 3rem;
  margin: 5rem 0 3rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.pre-footer-banner h2 {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 400;
  line-height: 1.2;
  color: #FFFFFF;
  margin-bottom: 1.25rem;
}

.pre-footer-banner p {
  font-size: 1.15rem;
  color: #B0AEA5;
  max-width: 680px;
  margin: 0 auto 2.5rem auto;
  line-height: 1.6;
}

.pre-footer-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* 7. Comprehensive 5-Column Anthropic Footer */
.footer-5col-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: 3rem;
  padding: 4.5rem 0 3.5rem 0;
}

.footer-col h5 {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 1.35rem;
  font-weight: 600;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}

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

/* 8. Full Article Reader Modal Overlays */
.article-reader-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-reader-meta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  margin-bottom: 1rem;
}

.article-reader-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 500;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.article-reader-subhead {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.5;
}

.article-prose {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-primary);
}

.article-prose h4 {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  margin: 2.25rem 0 0.85rem 0;
  color: var(--text-primary);
}

.article-prose p {
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

.article-prose strong {
  color: var(--text-primary);
}

.math-equation-block {
  background: var(--bg-subtle);
  border-left: 3px solid var(--accent-terracotta);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  overflow-x: auto;
}

.bibtex-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: pre;
  overflow-x: auto;
  margin-top: 2rem;
}

/* Responsive Enhancements */
@media (max-width: 1024px) {
  .releases-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .featured-news-grid {
    grid-template-columns: 1fr;
  }
  .research-hero-split {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .footer-5col-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pub-list-row {
    grid-template-columns: 120px 140px 1fr 30px;
  }
}

@media (max-width: 768px) {
  .pub-list-row {
    grid-template-columns: 1fr;
    gap: 0.4rem;
    padding: 1rem 0;
  }
  .pub-row-arrow {
    display: none;
  }
  .footer-5col-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .pre-footer-banner {
    padding: 3rem 1.5rem;
  }
  .pre-footer-banner h2 {
    font-size: 2rem;
  }
}