/* ChargeCliff — a dashboard for the driver sitting at the stall, not a
   marketing page. Dark by default (in-cabin glare at night, per the spec's
   own UI guidance), high-contrast metric cards, transparent derivations. */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --bg: #020617;
  --surface: #0f172a;
  --surface-2: #1e293b;
  --border: rgba(148, 163, 184, 0.16);
  --border-strong: rgba(148, 163, 184, 0.32);
  --ink-1: #f8fafc;
  --ink-2: #94a3b8;
  --ink-3: #64748b;
  --accent: #22d3ee;
  --accent-dim: rgba(34, 211, 238, 0.14);
  --good: #4ade80;
  --warn: #fbbf24;
  --bad: #f87171;
  --display: 'Space Grotesk', ui-sans-serif, system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --radius: 10px;
}

* { box-sizing: border-box; }
html { color-scheme: dark; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink-1);
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent); color: var(--bg); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { font-family: var(--display); font-weight: 600; letter-spacing: -0.01em; margin: 0; color: #fff; text-wrap: balance; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

.eyebrow {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); display: flex; align-items: center; gap: 8px;
}
.eyebrow::before { content: ''; width: 16px; height: 1px; background: var(--accent); }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

header.site {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
header.site .bar { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; max-width: 1180px; margin: 0 auto; }
.brand { display: flex; align-items: center; gap: 9px; font-family: var(--display); font-weight: 700; font-size: 17px; color: #fff; }
.brand .bolt { color: var(--accent); font-size: 20px; line-height: 1; }
nav.site-nav { display: flex; align-items: center; gap: 26px; }
nav.site-nav a { color: var(--ink-2); font-size: 14px; font-weight: 500; }
nav.site-nav a:hover { color: #fff; text-decoration: none; }
nav.site-nav a.current { color: var(--accent); }

.btn {
  font-family: var(--mono); font-size: 13px; font-weight: 600; color: var(--bg);
  background: var(--accent); border: none; border-radius: 8px; padding: 10px 18px;
  cursor: pointer; display: inline-flex; align-items: center; gap: 8px;
}
.btn:hover { background: #67e3f5; text-decoration: none; }
.btn.ghost { background: transparent; color: var(--ink-1); border: 1px solid var(--border-strong); }
.btn.ghost:hover { border-color: var(--ink-2); background: rgba(255,255,255,0.03); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Hero */
.hero { padding: 60px 0 44px; border-bottom: 1px solid var(--border); position: relative; overflow: hidden; }
.hero-media {
  position: absolute; top: -40px; right: -60px; width: 480px; max-width: 46vw;
  opacity: 0.9; pointer-events: none;
  mask-image: linear-gradient(to left, black 55%, transparent 96%);
  -webkit-mask-image: linear-gradient(to left, black 55%, transparent 96%);
}
.hero-media img { width: 100%; height: auto; display: block; filter: drop-shadow(0 20px 60px rgba(34,211,238,0.15)); }
.hero .inner { position: relative; z-index: 1; max-width: 640px; }
.hero h1 { font-size: clamp(34px, 4.6vw, 50px); line-height: 1.06; margin: 16px 0 18px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lede { font-size: 17px; color: var(--ink-2); max-width: 54ch; margin: 0 0 26px; }
.hero .ctas { display: flex; gap: 12px; flex-wrap: wrap; }
@media (max-width: 860px) { .hero-media { display: none; } }

/* Tabs */
.calc-tabs {
  display: flex; gap: 4px; padding: 4px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; margin: 0 0 24px; width: fit-content;
}
.calc-tab {
  font-family: var(--mono); font-size: 13px; font-weight: 500; color: var(--ink-2);
  background: transparent; border: none; border-radius: 8px; padding: 9px 16px; cursor: pointer;
}
.calc-tab.active { background: var(--surface-2); color: #fff; }

section.calc-section { padding: 48px 0; border-bottom: 1px solid var(--border); }

.calc-grid { display: grid; grid-template-columns: 380px 1fr; gap: 28px; align-items: start; }
@media (max-width: 860px) { .calc-grid { grid-template-columns: 1fr; } }

.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.panel h3 { font-size: 15px; margin-bottom: 16px; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 12.5px; color: var(--ink-2); margin-bottom: 6px; font-weight: 500; }
.field select, .field input {
  width: 100%; background: var(--surface-2); border: 1px solid var(--border-strong); border-radius: 8px;
  padding: 10px 12px; color: var(--ink-1); font: inherit; font-size: 14px;
}
.field select:focus, .field input:focus { outline: none; border-color: var(--accent); }
.field .hint { font-size: 11.5px; color: var(--ink-3); margin-top: 4px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* Results */
.result-panel { min-height: 320px; }
.result-empty { display: flex; align-items: center; justify-content: center; height: 320px; color: var(--ink-3); font-size: 14px; }

.metric-hero {
  background: linear-gradient(135deg, var(--accent-dim), transparent);
  border: 1px solid var(--border-strong); border-radius: var(--radius);
  padding: 26px; margin-bottom: 20px; text-align: center;
}
.metric-hero .value { font-family: var(--mono); font-size: 44px; font-weight: 700; color: #fff; line-height: 1; }
.metric-hero .label { font-size: 13px; color: var(--ink-2); margin-top: 8px; }
.metric-hero .value.good { color: var(--good); }
.metric-hero .value.warn { color: var(--warn); }
.metric-hero .value.bad { color: var(--bad); }

.metric-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; margin-bottom: 20px; }
.metric-cell { background: var(--surface); padding: 14px 16px; }
.metric-cell .n { font-family: var(--mono); font-size: 19px; font-weight: 600; color: #fff; }
.metric-cell .l { font-size: 11.5px; color: var(--ink-3); margin-top: 3px; }

.derivation { border: 1px solid var(--border); border-radius: 8px; padding: 14px 16px; margin-bottom: 12px; }
.derivation summary { cursor: pointer; font-size: 13px; color: var(--ink-2); font-weight: 500; }
.derivation-body { margin-top: 12px; display: flex; flex-direction: column; gap: 8px; }
.derivation-row { display: flex; justify-content: space-between; font-size: 13px; }
.derivation-row .k { color: var(--ink-2); }
.derivation-row .v { font-family: var(--mono); color: var(--ink-1); }

.classification-badge {
  display: inline-flex; align-items: center; gap: 6px; font-family: var(--mono); font-size: 12px;
  font-weight: 600; padding: 5px 12px; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.04em;
}
.classification-badge.fair_value { background: rgba(74,222,128,0.14); color: var(--good); }
.classification-badge.elevated { background: rgba(251,191,36,0.14); color: var(--warn); }
.classification-badge.predatory_rate_trap { background: rgba(248,113,113,0.14); color: var(--bad); }

.curve-chart { width: 100%; height: 140px; margin-top: 4px; }

.unverified-flag {
  display: inline-flex; align-items: center; gap: 6px; font-size: 11px; color: var(--warn);
  font-family: var(--mono); margin-left: 8px;
}

/* About */
.about-hero { padding: 56px 0 36px; border-bottom: 1px solid var(--border); }
.about-hero h1 { font-size: clamp(30px, 4vw, 42px); margin: 14px 0 18px; }
.about-hero p.lede { color: var(--ink-2); font-size: 16.5px; max-width: 66ch; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; }
@media (max-width: 800px) { .two-col { grid-template-columns: 1fr; } }
.two-col h3 { font-size: 18px; margin-bottom: 10px; color: var(--accent); }
.two-col p { color: var(--ink-2); font-size: 14.5px; }
.model-list { display: flex; flex-direction: column; gap: 18px; }
.model-item { border-left: 2px solid var(--border-strong); padding-left: 16px; }
.model-item h4 { font-size: 15px; margin-bottom: 4px; }
.model-item p { font-size: 13.5px; color: var(--ink-2); margin: 0; }

footer.site { border-top: 1px solid var(--border); padding: 26px 0 40px; }
footer.site .wrap { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 14px; }
footer.site p { color: var(--ink-3); font-size: 13px; margin: 0; font-family: var(--mono); }
footer.site .flinks { display: flex; gap: 20px; }
footer.site .flinks a { color: var(--ink-2); font-size: 13px; }