/* ============================================================
   AI Vantage — Styles
   Light theme consistent with AI Compass
   ============================================================ */
:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface2: #f0f1f3;
  --border: #e5e7eb;
  --text: #111827;
  --text2: #6b7280;
  --accent: #4f46e5;
  --accent2: #4338ca;
  --green: #059669;
  --amber: #d97706;
  --red: #dc2626;
  --blue: #2563eb;
  --pink: #db2777;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --ease: .3s cubic-bezier(.4,0,.2,1);
  --max-w: 1280px;
}

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

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color var(--ease); }
a:hover { color: var(--accent2); }

/* --- Layout --- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }

/* --- Nav --- */
.nav {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(255,255,255,.95);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
.nav-brand {
  font-weight: 800; font-size: 1.15rem;
  color: var(--accent);
  display: flex; align-items: center; gap: 8px;
  text-decoration: none;
}
.nav-brand span { font-size: 1.3rem; }
.nav-links { display: flex; gap: 22px; list-style: none; }
.nav-links a {
  font-size: .82rem; font-weight: 500; color: var(--text2);
  transition: color var(--ease); letter-spacing: .3px;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.nav-toggle { display: none; background: none; border: none; color: var(--text); font-size: 1.4rem; cursor: pointer; }

/* Nav — AI Lab dropdown */
.nav-lab { position: relative; }
.nav-lab-trigger { cursor: pointer; }
.nav-lab-dropdown {
  display: none; position: absolute; right: 0; top: calc(100% + 12px);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 8px; min-width: 240px; z-index: 200;
  box-shadow: 0 8px 30px rgba(0,0,0,.12);
}
.nav-lab:hover .nav-lab-dropdown,
.nav-lab-dropdown:hover { display: block; }
.nav-lab-dropdown > a {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  border-radius: var(--radius-sm); color: var(--text); text-decoration: none;
  transition: background .15s;
}
.nav-lab-dropdown > a:hover { background: var(--surface2); }
.nav-lab-dropdown > a span { font-size: 1.3rem; flex-shrink: 0; }
.nav-lab-dropdown > a strong { font-size: .85rem; display: block; color: var(--text); }
.nav-lab-dropdown > a small { font-size: .72rem; color: var(--text2); display: block; margin-top: 1px; }
.nav-lab-footer { font-size: .7rem; color: var(--text2); text-align: center; padding: 8px 0 4px; border-top: 1px solid var(--border); margin-top: 4px; }
.nav-lab-footer a { color: var(--accent); }

/* --- Hero --- */
.hero {
  text-align: center;
  padding: 40px 40px 32px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg) 100%);
  pointer-events: none;
  z-index: -1;
}
.hero-icon { font-size: 3rem; margin-bottom: 12px; display: block; }
.hero h1 {
  font-size: clamp(2rem, 5vw, 2.8rem); font-weight: 800;
  color: var(--text);
  margin-bottom: 10px;
}
.hero .tagline {
  font-size: clamp(1rem, 2.5vw, 1.15rem);
  color: var(--text2); max-width: 900px; margin: 0 auto 24px;
  line-height: 1.6;
}
.hero .provocation {
  font-size: .98rem; color: var(--text);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 28px;
  max-width: 900px; margin: 0 auto 28px;
  line-height: 1.75; position: relative;
}
.hero .provocation::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--accent);
  border-radius: var(--radius) var(--radius) 0 0;
}

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 50px; font-weight: 600;
  font-size: .9rem; cursor: pointer; border: none;
  transition: all var(--ease); text-decoration: none;
}
.btn-primary {
  background: var(--accent);
  color: #fff; box-shadow: 0 2px 8px rgba(79,70,229,.25);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 4px 14px rgba(79,70,229,.35); background: var(--accent2); }
.btn-secondary {
  background: var(--surface2); color: var(--text); border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-group { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* --- Section --- */
.section { padding: 40px 0; }
.section-title {
  font-size: 1.6rem; font-weight: 800; text-align: center; margin-bottom: 8px;
}
.section-sub {
  text-align: center; color: var(--text2); font-size: .92rem;
  max-width: 600px; margin: 0 auto 36px;
}

/* --- Persona Grid --- */
.persona-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.persona-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  transition: all var(--ease);
  position: relative;
  overflow: hidden;
}
.persona-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--card-accent, var(--accent));
  opacity: 0; transition: opacity var(--ease);
}
.persona-card:hover, .persona-card.selected {
  border-color: var(--card-accent, var(--accent));
  transform: translateY(-3px);
  box-shadow: 0 4px 16px rgba(0,0,0,.08);
}
.persona-card:hover::before, .persona-card.selected::before { opacity: 1; }
.persona-card .icon { font-size: 2rem; margin-bottom: 10px; }
.persona-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 4px; }
.persona-card .subtitle { font-size: .78rem; color: var(--text2); margin-bottom: 8px; }
.persona-card .desc { font-size: .82rem; color: var(--text2); line-height: 1.55; }

/* --- Assessment --- */
.assess-wrap { max-width: 720px; margin: 0 auto; }
.assess-progress {
  background: var(--surface2); border-radius: 50px; height: 8px; margin-bottom: 32px;
  overflow: hidden;
}
.assess-progress-bar {
  height: 100%; border-radius: 50px;
  background: var(--accent);
  transition: width .5s ease;
}
.assess-qnum { font-size: .8rem; color: var(--text2); margin-bottom: 10px; }
.assess-question {
  font-size: 1.15rem; font-weight: 700; margin-bottom: 24px; line-height: 1.5;
}
.assess-options { display: flex; flex-direction: column; gap: 10px; }
.assess-opt {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  cursor: pointer;
  transition: all var(--ease);
  font-size: .9rem; color: var(--text);
  display: flex; align-items: center; gap: 12px;
}
.assess-opt:hover { border-color: var(--accent); background: var(--surface2); }
.assess-opt.selected { border-color: var(--accent); background: rgba(79,70,229,.06); }
.assess-opt .opt-marker {
  width: 22px; height: 22px; border-radius: 50%;
  border: 2px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: .7rem; font-weight: 700; color: var(--accent);
  flex-shrink: 0; transition: all var(--ease);
}
.assess-opt.selected .opt-marker {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}
.assess-nav { display: flex; justify-content: space-between; margin-top: 32px; }

/* --- Results --- */
.results-hero {
  text-align: center; padding: 40px 0 20px;
}
.results-score {
  font-size: 4rem; font-weight: 900;
  color: var(--accent);
  line-height: 1;
}
.results-band {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 18px; border-radius: 50px;
  font-size: .85rem; font-weight: 700;
  margin: 12px 0 8px;
}
.results-desc { color: var(--text2); max-width: 580px; margin: 0 auto; }

/* Radar Chart */
.radar-wrap {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  margin: 32px auto; max-width: 500px; text-align: center;
}
.radar-wrap h3 { font-size: 1rem; margin-bottom: 16px; font-weight: 700; }
.radar-canvas { max-width: 100%; }

/* Dimension bars */
.dim-bars { max-width: 580px; margin: 0 auto 40px; }
.dim-bar-item { margin-bottom: 14px; }
.dim-bar-label {
  display: flex; justify-content: space-between; font-size: .82rem;
  margin-bottom: 4px; color: var(--text2);
}
.dim-bar-label strong { color: var(--text); }
.dim-bar-track { height: 8px; background: var(--surface2); border-radius: 50px; overflow: hidden; }
.dim-bar-fill { height: 100%; border-radius: 50px; transition: width .8s ease; }

/* Action Plan */
.plan-tabs { display: flex; gap: 8px; justify-content: center; margin-bottom: 24px; flex-wrap: wrap; }
.plan-tab {
  padding: 8px 20px; border-radius: 50px; font-size: .82rem;
  font-weight: 600; cursor: pointer; border: 1px solid var(--border);
  background: var(--surface); color: var(--text2); transition: all var(--ease);
}
.plan-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.plan-list { max-width: 650px; margin: 0 auto; }
.plan-item {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 14px 18px;
  margin-bottom: 10px; display: flex; align-items: flex-start; gap: 12px;
  font-size: .88rem; line-height: 1.55;
}
.plan-item .check {
  width: 22px; height: 22px; border-radius: 6px;
  border: 2px solid var(--border); flex-shrink: 0; margin-top: 2px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all var(--ease);
}
.plan-item .check.done { background: var(--green); border-color: var(--green); }
.plan-item .check.done::after { content: '✓'; color: #fff; font-size: .7rem; font-weight: 700; }

/* --- Landscape --- */
.timeline-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}
.timeline-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
  overflow: hidden;
}
.timeline-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--card-color, var(--accent));
}
.timeline-card .era-header {
  display: flex; align-items: center; gap: 8px;
  font-size: 1.1rem; font-weight: 800; margin-bottom: 14px;
}
.timeline-card .era-header .emoji { font-size: 1.3rem; }
.timeline-card ul { list-style: none; padding: 0; }
.timeline-card li {
  font-size: .84rem; color: var(--text2); padding: 5px 0;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 8px;
}
.timeline-card li::before { content: '›'; color: var(--card-color, var(--accent)); font-weight: 700; }

/* Role evolution */
.role-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
}
.role-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 18px;
}
.role-card .role-header {
  display: flex; align-items: center; gap: 10px; margin-bottom: 8px;
}
.role-card .role-icon { font-size: 1.3rem; }
.role-card .role-from { color: var(--text2); font-size: .85rem; }
.role-card .role-arrow { color: var(--accent); margin: 0 6px; }
.role-card .role-to { font-weight: 700; font-size: .9rem; color: var(--green); }
.role-card .role-desc { font-size: .82rem; color: var(--text2); line-height: 1.55; }

/* Arch shifts */
.arch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}
.arch-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 16px;
  display: flex; align-items: center; gap: 10px;
}
.arch-card .arch-emoji { font-size: 1.5rem; }
.arch-flow { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; font-size: .82rem; }
.arch-flow .old { color: var(--text2); text-decoration: line-through; opacity: .6; }
.arch-flow .current { color: var(--text); }
.arch-flow .next { color: var(--green); font-weight: 700; }
.arch-flow .arrow { color: var(--accent); font-size: .7rem; }

/* Reality Check */
.reality-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 14px; margin-top: 8px;
}
.reality-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 18px;
}
.reality-card .myth {
  font-size: .82rem; color: var(--red); font-weight: 700;
  margin-bottom: 6px; display: flex; align-items: center; gap: 6px;
}
.reality-card .myth::before { content: '✗'; }
.reality-card .truth {
  font-size: .84rem; color: var(--text2); line-height: 1.55;
}
.reality-card .truth::before {
  content: '✓ '; color: var(--green); font-weight: 700;
}

/* --- Ecosystem cross-link cards --- */
.ecosystem-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 16px; }
.ecosystem-card {
  display: flex; flex-direction: column; gap: 6px; padding: 20px 22px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  text-decoration: none; color: var(--text); transition: all .25s;
}
.ecosystem-card:hover { border-color: var(--eco-color, var(--accent)); background: var(--surface2); transform: translateY(-2px); }
.ecosystem-icon { font-size: 1.6rem; }
.ecosystem-card strong { font-size: 1rem; color: var(--eco-color, var(--accent)); }
.ecosystem-desc { font-size: .82rem; color: var(--text2); line-height: 1.5; }
.ecosystem-cta { font-size: .78rem; font-weight: 600; color: var(--eco-color, var(--accent)); margin-top: 4px; }

/* --- Footer --- */
.footer {
  text-align: center; padding: 40px 20px;
  border-top: 1px solid var(--border);
  font-size: .78rem; color: var(--text2);
}
.footer a { color: var(--accent); }

/* --- Pages (tabs) --- */
.page { display: none; }
.page.active { display: block; }

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 56px; left: 0; right: 0;
    background: var(--surface); border-bottom: 1px solid var(--border);
    padding: 12px 20px; gap: 14px;
  }
  .nav-lab-dropdown { position: static; box-shadow: none; border: none; background: transparent; padding: 4px 0 0 20px; min-width: auto; }
  .nav-lab:hover .nav-lab-dropdown { display: none; }
  .nav-lab.open .nav-lab-dropdown { display: block; }
  .nav-lab-dropdown > a { padding: 6px 8px; }
  .nav-lab-footer { display: none; }
  .nav-toggle { display: block; }
  .hero { padding: 50px 16px 40px; }
  .hero h1 { font-size: 1.8rem; }
  .persona-grid { grid-template-columns: 1fr 1fr; }
  .timeline-grid { grid-template-columns: 1fr; }
  .role-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .persona-grid { grid-template-columns: 1fr; }
}