/* ─── HERO ─── */
  #hero {
    position: relative;
    min-height: 92vh;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    overflow: hidden;
    padding: 8rem 4rem 5rem;
  }
  .hero-bg {
    position: absolute; inset: 0;
    background:
      radial-gradient(ellipse 80% 60% at 50% 40%, rgba(46,196,182,0.06) 0%, transparent 70%),
      radial-gradient(ellipse 50% 40% at 20% 80%, rgba(233,196,106,0.05) 0%, transparent 60%),
      var(--bg);
  }
  .hero-grid-overlay {
    position: absolute; inset: 0;
    background-image:
      linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: radial-gradient(ellipse 90% 80% at 50% 50%, black 0%, transparent 75%);
  }
  #hero::after {
    content: '';
    position: absolute; inset: 0;
    background: var(--hero-overlay);
    pointer-events: none;
  }
  .hero-content {
    position: relative; z-index: 2;
    text-align: center;
    max-width: 860px;
    animation: fadeUp 1s ease both;
  }
  .hero-eyebrow {
    display: inline-flex; align-items: center; gap: 0.6rem;
    font-family: var(--font-display);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--teal);
    margin-bottom: 1.8rem;
  }
  .hero-eyebrow::before, .hero-eyebrow::after {
    content: '';
    display: block; width: 40px; height: 1px;
    background: var(--teal); opacity: 0.5;
  }
  .hero-title {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 8vw, 7rem);
    font-weight: 600;
    line-height: 1.0;
    letter-spacing: -0.01em;
    margin-bottom: 1.5rem;
  }
  .hero-title em {
    font-style: normal;
    background: linear-gradient(135deg, var(--teal) 0%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
  .hero-sub {
    font-size: 1.15rem;
    font-weight: 300;
    color: var(--hero-sub);
    max-width: 580px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
  }
  .hero-actions {
    display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap;
  }
  .btn-primary {
    padding: 0.85rem 2.2rem;
    background: var(--gold);
    color: #08080E;
    border-radius: 2px;
    font-family: var(--font-display);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    transition: transform 0.2s, opacity 0.2s;
  }
  .btn-primary:hover { transform: translateY(-2px); opacity: 0.9; }
  .btn-ghost {
    padding: 0.85rem 2.2rem;
    border: 1px solid rgba(240,237,230,0.25);
    color: var(--text);
    border-radius: 2px;
    font-family: var(--font-display);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    transition: border-color 0.2s, transform 0.2s;
  }
  .btn-ghost:hover { border-color: rgba(240,237,230,0.5); transform: translateY(-2px); }
  .scroll-hint {
    position: absolute; bottom: 2.5rem; left: 50%; transform: translateX(-50%);
    z-index: 2;
    display: flex; flex-direction: column; align-items: center; gap: 0.4rem;
    font-size: 0.7rem; letter-spacing: 0.15em; text-transform: uppercase;
    color: var(--muted);
    animation: bounce 2s infinite;
  }
  .scroll-hint::after {
    content: '';
    display: block; width: 1px; height: 40px;
    background: linear-gradient(to bottom, var(--teal), transparent);
  }

  /* ─── SECTION GLOBALS ─── */
  section { padding: 7rem 4rem; }
  .inner { max-width: 1200px; margin: 0 auto; }
  .section-eyebrow {
    font-family: var(--font-display);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 1rem;
  }
  .section-eyebrow.teal { color: var(--teal); }
  .section-title {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 4.5vw, 3.8rem);
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.1;
    margin-bottom: 1.2rem;
  }
  .section-desc {
    font-size: 1.05rem;
    font-weight: 300;
    color: var(--section-desc);
    line-height: 1.75;
    max-width: 580px;
  }

  /* ─── INTRO STRIP ─── */
  #intro {
    background: var(--surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 5rem 4rem;
  }
  .intro-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 6rem;
    align-items: center;
  }
  .intro-lead {
    font-family: var(--font-accent);
    font-size: clamp(1.3rem, 2.2vw, 1.7rem);
    font-style: italic;
    color: var(--text);
    line-height: 1.55;
    margin-bottom: 1.8rem;
  }
  .intro-body {
    font-size: 0.98rem;
    color: var(--origin-body);
    line-height: 1.8;
  }
  .intro-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
  .stat-box {
    padding: 1.8rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--surface2);
    transition: border-color 0.2s;
  }
  .stat-box:hover { border-color: rgba(46,196,182,0.3); }
  .stat-num {
    font-family: var(--font-display);
    font-size: 2.4rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.4rem;
    background: linear-gradient(135deg, var(--teal) 0%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
  .stat-label {
    font-size: 0.82rem;
    color: var(--muted);
    font-weight: 500;
    letter-spacing: 0.06em;
  }

  /* ─── AI IMPLEMENTATIONS ─── */
  #ai {
    max-width: 1200px; margin: 0 auto;
  }
  #ai-wrap { background: var(--bg); }

  .ai-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 3.5rem;
    flex-wrap: wrap;
    gap: 1.5rem;
  }

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

  .ai-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 2.2rem;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    box-shadow: var(--card-shadow);
  }
  .ai-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: var(--card-accent, var(--teal));
    transform: scaleX(0); transform-origin: left;
    transition: transform 0.35s ease;
  }
  .ai-card:hover::before { transform: scaleX(1); }
  .ai-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0,0,0,0.35);
    border-color: rgba(255,255,255,0.14);
  }
  .ai-card.featured {
    grid-column: span 2;
    background: linear-gradient(135deg, var(--surface) 0%, rgba(46,196,182,0.05) 100%);
  }
  .ai-card-tag {
    font-family: var(--font-display);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--teal);
    margin-bottom: 0.8rem;
  }
  .ai-card-tag.gold { color: var(--gold); }
  .ai-card-icon {
    width: 44px; height: 44px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(46,196,182,0.08);
    border: 1px solid rgba(46,196,182,0.2);
    border-radius: 8px;
    color: var(--teal);
    margin-bottom: 1.2rem;
  }
  .ai-card-icon.gold-icon {
    background: rgba(233,196,106,0.08);
    border-color: rgba(233,196,106,0.2);
    color: var(--gold);
  }
  .ai-card-icon svg { width: 20px; height: 20px; }
  .ai-card h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.7rem;
    letter-spacing: -0.01em;
  }
  .ai-card p {
    font-size: 0.9rem;
    color: var(--muted);
    line-height: 1.7;
    margin-bottom: 1.2rem;
  }
  .ai-card-chips {
    display: flex; flex-wrap: wrap; gap: 0.45rem;
  }
  .chip {
    display: inline-block;
    padding: 0.2rem 0.65rem;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--muted);
    transition: border-color 0.2s, color 0.2s;
  }
  .chip:hover { border-color: var(--teal); color: var(--teal); }
  .chip.gold-chip:hover { border-color: var(--gold); color: var(--gold); }
  .ai-card .status-dot {
    display: inline-flex; align-items: center; gap: 0.4rem;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    margin-top: 1rem;
  }
  .status-dot::before {
    content: '';
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--dot-color, var(--teal));
    box-shadow: 0 0 6px var(--dot-color, var(--teal));
    flex-shrink: 0;
  }
  .status-dot.active::before { background: var(--teal); --dot-color: var(--teal); }
  .status-dot.testing::before { background: var(--gold); --dot-color: var(--gold); box-shadow: 0 0 6px var(--gold); }
  .status-dot.iterating::before { background: var(--coral); --dot-color: var(--coral); box-shadow: 0 0 6px var(--coral); }

  /* ─── STACK ─── */
  #stack {
    background: var(--surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }
  #stack .inner { max-width: 1200px; margin: 0 auto; }

  .stack-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
    margin-bottom: 3.5rem;
  }

  .stack-categories {
    display: flex; flex-direction: column; gap: 2.5rem;
    margin-top: 0;
  }
  .stack-cat-label {
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 0.9rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--border);
  }
  .stack-chips {
    display: flex; flex-wrap: wrap; gap: 0.6rem;
  }
  .stack-chip {
    padding: 0.45rem 0.95rem;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text);
    display: flex; align-items: center; gap: 0.5rem;
    transition: all 0.2s;
  }
  .stack-chip:hover {
    border-color: var(--teal);
    color: var(--teal);
    background: rgba(46,196,182,0.04);
  }
  .stack-chip .dot {
    width: 5px; height: 5px; border-radius: 50%;
    background: var(--teal); flex-shrink: 0;
  }
  .stack-chip .dot.gold { background: var(--gold); }
  .stack-chip .dot.coral { background: var(--coral); }

  /* ─── APPROACH ─── */
  #approach {
    max-width: 1200px; margin: 0 auto;
  }
  #approach-wrap { background: var(--bg); }

  .approach-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border);
    margin-top: 3.5rem;
  }
  .approach-card {
    background: var(--bg);
    padding: 2.5rem 2rem;
    transition: background 0.3s;
    position: relative;
  }
  .approach-card:hover { background: var(--surface); }
  .approach-num {
    font-family: var(--font-display);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--teal);
    opacity: 0.7;
    margin-bottom: 1rem;
  }
  .approach-card h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.7rem;
    letter-spacing: -0.01em;
  }
  .approach-card p {
    font-size: 0.88rem;
    color: var(--muted);
    line-height: 1.65;
  }

  /* ─── CTA ─── */
  #cta {
    background: var(--surface);
    border-top: 1px solid var(--border);
    text-align: center;
  }
  .cta-inner {
    max-width: 700px; margin: 0 auto;
  }

  /* ─── FOOTER ─── */
  footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 4rem 4rem 2rem;
  }
  .footer-grid {
    display: grid;
    grid-template-columns: 1.8fr 1fr 1fr 1fr;
    gap: 3rem;
    max-width: 1200px; margin: 0 auto 3rem;
  }
  .footer-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 0.8rem;
  }
  .footer-logo span { color: var(--gold); }
  .footer-tagline {
    font-size: 0.88rem;
    color: var(--footer-link);
    line-height: 1.65;
    margin-bottom: 1.5rem;
    max-width: 280px;
  }
  .social-links { display: flex; gap: 0.8rem; }
  .social-link {
    width: 34px; height: 34px;
    border: 1px solid var(--border);
    border-radius: 4px;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--muted);
    text-decoration: none;
    transition: border-color 0.2s, color 0.2s;
  }
  .social-link:hover { border-color: var(--gold); color: var(--gold); }
  .footer-col h4 {
    font-family: var(--font-display);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text);
    margin-bottom: 1.2rem;
  }
  .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.65rem; }
  .footer-col ul li a {
    font-size: 0.88rem;
    color: var(--footer-link);
    text-decoration: none;
    transition: color 0.2s;
  }
  .footer-col ul li a:hover { color: var(--text); }
  .footer-bottom {
    display: flex; justify-content: space-between; align-items: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    font-size: 0.78rem;
    color: var(--muted);
    max-width: 1200px; margin: 0 auto;
  }

  /* ─── ANIMATIONS ─── */
  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(28px); }
    to { opacity: 1; transform: translateY(0); }
  }
  @keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(6px); }
  }

  .js-reveal-ready .reveal {
    opacity: 0; transform: translateY(22px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .js-reveal-ready .reveal.visible {
    opacity: 1; transform: none;
  }

  /* ─── RESPONSIVE ─── */
  @media (max-width: 1024px) {
    nav { padding: 1rem 2rem; }
    section { padding: 5rem 2rem; }
    #intro { padding: 4rem 2rem; }
    .intro-grid { grid-template-columns: 1fr; gap: 3rem; }
    .ai-grid { grid-template-columns: 1fr 1fr; }
    .ai-card.featured { grid-column: span 2; }
    .approach-grid { grid-template-columns: 1fr 1fr; }
    .stack-header { grid-template-columns: 1fr; gap: 2rem; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
  }
  @media (max-width: 768px) {
    .nav-links { display: none; }
    nav { padding: 1rem 1.5rem; }
    section { padding: 4rem 1.5rem; }
    #intro { padding: 3.5rem 1.5rem; }
    .ai-grid { grid-template-columns: 1fr; }
    .ai-card.featured { grid-column: span 1; }
    .approach-grid { grid-template-columns: 1fr; }
    .intro-stats { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
    .footer-bottom { flex-direction: column; gap: 0.5rem; text-align: center; }
  }

  .logo-light { display: none; }
  .logo-dark  { display: block; mix-blend-mode: screen; }
  [data-theme="light"] .logo-dark  { display: none; }
  [data-theme="light"] .logo-light { display: block; mix-blend-mode: multiply; }