/* ============================================================================
 * DecisionTwin AI — styles
 * ========================================================================== */
:root {
  --bg: #0b1020;
  --bg-soft: #111933;
  --panel: #151e3d;
  --panel-2: #1b2547;
  --ink: #eaf0ff;
  --ink-soft: #aab6da;
  --muted: #7d89b0;
  --line: #263157;
  --brand: #6c8cff;
  --brand-2: #9d6cff;
  --accent: #54d6a5;
  --danger: #ff6b6b;
  --warn: #ffb454;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 18px 50px rgba(0,0,0,.45);
  --maxw: 1180px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 700px at 70% -10%, #1a2350 0%, transparent 60%), var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
a { color: var(--brand); text-decoration: none; }
h1, h2, h3, h4 { line-height: 1.15; letter-spacing: -.02em; }

/* ── Buttons ──────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  border: 1px solid transparent; border-radius: 999px; cursor: pointer;
  font-weight: 600; font-size: 15px; padding: 11px 20px; transition: .15s;
  text-decoration: none; white-space: nowrap;
}
.btn-primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; box-shadow: 0 8px 24px rgba(108,140,255,.35); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 30px rgba(108,140,255,.5); }
.btn-ghost { background: rgba(255,255,255,.04); border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { background: rgba(255,255,255,.09); }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-block { width: 100%; }

/* ── Nav ──────────────────────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(11,16,32,.72);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 800; font-size: 19px; color: var(--ink); letter-spacing: -.03em; }
.brand-mark { margin-right: 4px; }
.brand-ai { color: var(--brand); }
.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-links a { color: var(--ink-soft); font-weight: 500; }
.nav-links a:hover { color: var(--ink); }

/* ── Hero ─────────────────────────────────────────────────────────────── */
.hero { padding: 86px 0 64px; text-align: center; }
.badge {
  display: inline-block; padding: 6px 14px; border-radius: 999px;
  background: rgba(108,140,255,.12); border: 1px solid rgba(108,140,255,.3);
  color: var(--brand); font-size: 13px; font-weight: 600; margin-bottom: 24px;
}
.hero h1 { font-size: clamp(34px, 5.6vw, 60px); font-weight: 800; }
.grad { background: linear-gradient(120deg, var(--brand), var(--brand-2) 60%, var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { max-width: 720px; margin: 22px auto 0; color: var(--ink-soft); font-size: 18px; }
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 32px; }
.hero-stats { display: flex; gap: 48px; justify-content: center; flex-wrap: wrap; margin-top: 48px; }
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 30px; color: var(--ink); }
.hero-stats span { color: var(--muted); font-size: 14px; }

/* ── Bands & cards ────────────────────────────────────────────────────── */
.band { padding: 64px 0; border-top: 1px solid var(--line); }
.cols-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { color: var(--ink-soft); font-size: 15px; }

.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: clamp(26px, 3.6vw, 38px); font-weight: 800; }
.section-head p { color: var(--ink-soft); margin-top: 10px; font-size: 17px; }

/* ── App / Simulator ──────────────────────────────────────────────────── */
.app-section { padding: 72px 0; }
.tabs { display: flex; gap: 8px; justify-content: center; margin-bottom: 26px; }
.tab {
  background: var(--panel); border: 1px solid var(--line); color: var(--ink-soft);
  padding: 10px 20px; border-radius: 999px; cursor: pointer; font-weight: 600; font-size: 15px;
}
.tab.active { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; border-color: transparent; }
.tabpane { display: none; }
.tabpane.active { display: block; }

.sim-grid { display: grid; grid-template-columns: 380px 1fr; gap: 22px; align-items: start; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.panel.inputs { position: sticky; top: 82px; }

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; font-size: 14px; }
.field > span { color: var(--ink-soft); font-weight: 500; display: flex; justify-content: space-between; }
.field > span b { color: var(--brand); font-variant-numeric: tabular-nums; }
.field input[type=number], .field select {
  background: var(--bg-soft); border: 1px solid var(--line); color: var(--ink);
  border-radius: var(--radius-sm); padding: 10px 12px; font-size: 15px; font-family: inherit;
}
.field input:focus, .field select:focus { outline: none; border-color: var(--brand); }
.field input[type=range] { accent-color: var(--brand); height: 6px; }
.field-group { border-top: 1px solid var(--line); padding-top: 16px; margin-top: 4px; }
.field-group h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin-bottom: 14px; }

/* Results */
.results { min-height: 460px; }
.empty { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 420px; text-align: center; color: var(--muted); }
.empty-icon { font-size: 52px; margin-bottom: 14px; opacity: .7; }

.kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 18px; }
.kpi { background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 16px; }
.kpi .label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; }
.kpi .value { font-size: 24px; font-weight: 800; margin-top: 4px; font-variant-numeric: tabular-nums; }
.kpi.danger .value { color: var(--danger); }
.kpi.good .value { color: var(--accent); }

.insight, .recommend { border-radius: var(--radius-sm); padding: 14px 16px; margin-bottom: 12px; font-size: 15px; }
.insight { background: rgba(108,140,255,.1); border: 1px solid rgba(108,140,255,.3); }
.recommend { background: rgba(84,214,165,.1); border: 1px solid rgba(84,214,165,.3); }
.insight b, .recommend b { display: block; margin-bottom: 3px; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; opacity: .85; }

.chart-block { margin-top: 20px; }
.chart-block h4 { font-size: 15px; margin-bottom: 12px; }

/* Funnel */
.funnel { display: flex; flex-direction: column; gap: 6px; }
.funnel-row { display: grid; grid-template-columns: 150px 1fr 84px; align-items: center; gap: 10px; font-size: 13px; }
.funnel-bar-track { background: var(--bg-soft); border-radius: 6px; height: 26px; overflow: hidden; }
.funnel-bar { height: 100%; border-radius: 6px; transition: width .5s; }
.funnel-row .lbl { color: var(--ink-soft); }
.funnel-row .num { text-align: right; color: var(--muted); font-variant-numeric: tabular-nums; }

/* Leak map bars */
.leak { display: flex; flex-direction: column; gap: 8px; }
.leak-row { font-size: 13px; }
.leak-row .leak-head { display: flex; justify-content: space-between; margin-bottom: 4px; }
.leak-row .leak-head .reason { color: var(--ink-soft); }
.leak-row .leak-head .amt { color: var(--danger); font-weight: 700; font-variant-numeric: tabular-nums; }
.leak-track { background: var(--bg-soft); border-radius: 6px; height: 12px; overflow: hidden; }
.leak-fill { height: 100%; background: linear-gradient(90deg, var(--danger), #ff9b6b); border-radius: 6px; }
.leak-row .stage-tag { color: var(--muted); font-size: 11px; }

.result-actions { margin-top: 18px; display: flex; gap: 10px; }

/* Compare */
.compare-intro { text-align: center; color: var(--ink-soft); margin-bottom: 22px; }
.compare-forms { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 18px; }
.cmp-summary { background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin: 22px 0; text-align: center; }
.cmp-summary .big { font-size: 30px; font-weight: 800; }
.cmp-summary .big.up { color: var(--accent); }
.cmp-summary .big.down { color: var(--danger); }
.cmp-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
table.delta { width: 100%; border-collapse: collapse; margin-top: 18px; font-size: 14px; }
table.delta th, table.delta td { text-align: right; padding: 9px 12px; border-bottom: 1px solid var(--line); font-variant-numeric: tabular-nums; }
table.delta th:first-child, table.delta td:first-child { text-align: left; }
table.delta thead th { color: var(--muted); font-size: 12px; text-transform: uppercase; }

/* ── How it works ─────────────────────────────────────────────────────── */
.how-step { display: grid; grid-template-columns: 56px 1fr; gap: 22px; max-width: 820px; margin: 0 auto 34px; }
.how-num { width: 48px; height: 48px; border-radius: 12px; background: linear-gradient(135deg, var(--brand), var(--brand-2)); display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 22px; }
.how-step h3 { font-size: 20px; margin-bottom: 8px; }
.how-step p { color: var(--ink-soft); }
.persona-table { margin-top: 14px; display: flex; flex-direction: column; gap: 6px; }
.persona-table > div { display: grid; grid-template-columns: 1fr 60px 1.4fr; gap: 10px; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 9px 14px; font-size: 14px; align-items: center; }
.persona-table span { color: var(--brand); font-weight: 700; }
.persona-table em { color: var(--muted); font-style: normal; }
.journey { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 8px 0 14px; }
.journey span { background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 7px 14px; font-size: 14px; font-weight: 600; }
.journey span.won { background: rgba(84,214,165,.15); border-color: rgba(84,214,165,.4); color: var(--accent); }
.journey i { color: var(--muted); font-style: normal; }

/* ── Pricing ──────────────────────────────────────────────────────────── */
.pricing { padding: 72px 0; border-top: 1px solid var(--line); }
.price-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.price-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px; position: relative; display: flex; flex-direction: column; }
.price-card.featured { border-color: var(--brand); box-shadow: 0 0 0 1px var(--brand), 0 18px 50px rgba(108,140,255,.25); }
.ribbon { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; font-size: 12px; font-weight: 700; padding: 4px 14px; border-radius: 999px; }
.price-card h3 { font-size: 18px; }
.price { font-size: 36px; font-weight: 800; margin: 8px 0 16px; }
.price small { font-size: 15px; color: var(--muted); font-weight: 500; }
.price-card ul { list-style: none; flex: 1; margin-bottom: 18px; }
.price-card li { padding: 7px 0; border-bottom: 1px solid var(--line); color: var(--ink-soft); font-size: 14px; }
.price-card li::before { content: "✓ "; color: var(--accent); font-weight: 700; }
.enterprise { text-align: center; margin-top: 28px; color: var(--ink-soft); }

/* ── CTA + footer ─────────────────────────────────────────────────────── */
.cta { padding: 80px 0; text-align: center; border-top: 1px solid var(--line); background: radial-gradient(800px 300px at 50% 0, rgba(108,140,255,.12), transparent 70%); }
.cta h2 { font-size: clamp(26px, 4vw, 40px); font-weight: 800; }
.cta p { color: var(--ink-soft); margin: 12px 0 26px; font-size: 18px; }
.footer { border-top: 1px solid var(--line); padding: 28px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 14px; }
.footer-links { display: flex; gap: 18px; }
.footer-links a { color: var(--ink-soft); }

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .sim-grid { grid-template-columns: 1fr; }
  .panel.inputs { position: static; }
  .cols-3 { grid-template-columns: 1fr; }
  .price-grid { grid-template-columns: 1fr 1fr; }
  .compare-forms, .cmp-cols { grid-template-columns: 1fr; }
  .kpis { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .nav-links a:not(.btn) { display: none; }
  .price-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 28px; }
  .funnel-row { grid-template-columns: 110px 1fr 64px; }
}