/* FitSense — on-device fit estimation. System fonts only (offline-first, no CDN). */

:root {
  --ink: #17211d;
  --ink-soft: #45544d;
  --ink-faint: #6b7a72;
  --paper: #f4f6f3;
  --card: #ffffff;
  --line: #dde4de;
  --accent: #1a4d3e;
  --accent-soft: #e2efe8;
  --accent-strong: #123a2f;
  --warn-bg: #fdf3e0;
  --warn-ink: #7a5311;
  --error-bg: #fbeaea;
  --error-ink: #8c2626;
  --ok: #2c7a4b;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(23, 33, 29, 0.06), 0 8px 24px rgba(23, 33, 29, 0.07);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0); clip-path: inset(50%);
  overflow: hidden; white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- header ---------- */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 12px;
  padding-bottom: 12px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--accent);
  color: #eaf5ef;
  font-weight: 800;
  font-size: 22px;
}
.brand-name { margin: 0; font-weight: 800; font-size: 18px; letter-spacing: 0.2px; }
.brand-sub { margin: 0; font-size: 12.5px; color: var(--ink-faint); }

.privacy-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 13px;
  color: var(--ink-soft);
  background: var(--accent-soft);
  border: 1px solid #c9dfd3;
  padding: 6px 12px;
  border-radius: 999px;
}
.dot { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.dot-loading { background: #d99c1e; animation: pulse 1.2s ease-in-out infinite; }
.dot-ready { background: var(--ok); }
.dot-fallback { background: #b46a12; }
@keyframes pulse { 50% { opacity: 0.35; } }

/* ---------- cards ---------- */
main { padding: 28px 0 48px; display: grid; gap: 22px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 28px;
}

h1 { font-size: 26px; line-height: 1.25; margin: 0 0 10px; letter-spacing: -0.3px; }
h2 { font-size: 19px; margin: 0 0 12px; letter-spacing: -0.2px; }
h3 { font-size: 15.5px; margin: 22px 0 6px; }
.lede { font-size: 15.5px; color: var(--ink-soft); margin: 0 0 14px; }

.privacy-card { border-top: 4px solid var(--accent); }
.privacy-points { margin: 0 0 16px; padding: 0; list-style: none; display: grid; gap: 8px; }
.privacy-points li {
  padding: 10px 14px 10px 38px;
  background: var(--accent-soft);
  border-radius: 10px;
  position: relative;
  font-size: 14.5px;
}
.privacy-points li::before {
  content: "✓";
  position: absolute;
  left: 14px;
  top: 9px;
  color: var(--accent);
  font-weight: 800;
}

.consent-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1.5px dashed var(--accent);
  border-radius: 10px;
  padding: 12px 14px;
  background: #fbfdfc;
}
.consent-row input[type="checkbox"] {
  width: 20px; height: 20px;
  margin-top: 2px;
  accent-color: var(--accent);
  flex: none;
}
.consent-row label { font-size: 14.5px; font-weight: 600; }

/* ---------- input section ---------- */
.input-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 26px;
}
@media (max-width: 720px) { .input-grid { grid-template-columns: 1fr; } }

.drop-zone {
  border: 2px dashed var(--line);
  border-radius: 12px;
  background: #fafbf9;
  transition: border-color 0.15s, background 0.15s;
}
.drop-zone.dragover { border-color: var(--accent); background: var(--accent-soft); }
.drop-zone.disabled { opacity: 0.55; }
.drop-zone input[type="file"] {
  position: absolute;
  width: 1px; height: 1px;
  opacity: 0;
}
.drop-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 34px 18px;
  cursor: pointer;
  text-align: center;
  font-size: 14.5px;
  color: var(--ink-soft);
}
.drop-zone input:disabled + .drop-label { cursor: not-allowed; }
.drop-zone input:focus-visible + .drop-label { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 12px; }
.drop-icon { font-size: 30px; color: var(--accent); }

.preview-wrap { margin-top: 14px; display: grid; gap: 10px; justify-items: start; }
#preview-canvas {
  max-width: 100%;
  max-height: 380px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
}

.controls { display: grid; gap: 8px; align-content: start; }
.field-label { font-weight: 700; font-size: 13.5px; margin: 0; }
.req { color: var(--error-ink); }

input[type="number"], select {
  font: inherit;
  padding: 10px 12px;
  border: 1.5px solid var(--line);
  border-radius: 9px;
  background: #fff;
  color: var(--ink);
  width: 100%;
}
input[type="number"]:focus-visible, select:focus-visible,
button:focus-visible, input[type="checkbox"]:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.help { font-size: 13px; color: var(--ink-faint); margin: 4px 0 0; }
.help.subtle { font-style: italic; }

.btn {
  font: inherit;
  font-weight: 700;
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; margin-top: 10px; }
.btn-primary:hover:not(:disabled) { background: var(--accent-strong); }
.btn-secondary { background: var(--accent-soft); color: var(--accent-strong); }
.btn-secondary:hover { background: #d3e7dc; }
.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--line);
}
.btn-ghost:hover { background: #f0f2ef; }
.btn-small { padding: 7px 12px; font-size: 13px; font-weight: 600; }

/* ---------- results ---------- */
.placeholder { color: var(--ink-faint); font-size: 14.5px; margin: 0; }

.error-panel {
  background: var(--error-bg);
  border: 1px solid #eec7c7;
  border-radius: 10px;
  padding: 16px 18px;
}
.error-panel h3 { margin: 0 0 6px; color: var(--error-ink); }
.error-panel p { margin: 0 0 6px; font-size: 14.5px; }

.result-hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  align-items: stretch;
  margin-bottom: 8px;
}
@media (max-width: 640px) { .result-hero { grid-template-columns: 1fr; } }

.size-box {
  background: var(--accent);
  color: #fff;
  border-radius: 12px;
  padding: 18px 30px;
  text-align: center;
  display: grid;
  align-content: center;
  gap: 2px;
  min-width: 170px;
}
.size-kicker { margin: 0; font-size: 12.5px; opacity: 0.85; text-transform: uppercase; letter-spacing: 1px; }
.size-value { margin: 0; font-size: 52px; font-weight: 800; line-height: 1.05; }
.size-prob { margin: 0; font-size: 13.5px; opacity: 0.9; }

.confidence-box { display: grid; gap: 6px; align-content: center; }
.conf-meter {
  height: 14px;
  border-radius: 999px;
  background: #e8ece8;
  overflow: hidden;
  border: 1px solid var(--line);
}
.conf-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, #d97f1e, #cbb31c 45%, var(--ok));
  transition: width 0.5s ease;
}
.conf-text { margin: 0; font-size: 14px; color: var(--ink-soft); }
.low-conf-flag {
  margin: 4px 0 0;
  background: var(--warn-bg);
  color: var(--warn-ink);
  border: 1px solid #ecd9ae;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 13.5px;
}

.dist-list { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 5px; }
.dist-list li {
  display: grid;
  grid-template-columns: 44px 1fr 52px;
  align-items: center;
  gap: 10px;
  font-size: 14px;
}
.dist-size { font-weight: 700; }
.dist-size.recommended::after { content: " ●"; color: var(--accent); }
.dist-bar-track { background: #eef1ee; border-radius: 6px; height: 18px; overflow: hidden; }
.dist-bar {
  height: 100%;
  background: #b9d4c6;
  border-radius: 6px;
  min-width: 2px;
  transition: width 0.5s ease;
}
.dist-bar.recommended { background: var(--accent); }
.dist-pct { text-align: right; color: var(--ink-soft); font-variant-numeric: tabular-nums; }

.table-scroll { overflow-x: auto; }
.measure-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14.5px;
  margin-top: 6px;
}
.measure-table th, .measure-table td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.measure-table thead th {
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--ink-faint);
}
.measure-table td.num { font-variant-numeric: tabular-nums; }
.measure-table tr.driver td { background: var(--accent-soft); }
.measure-table tr.chart-hit td { background: var(--accent-soft); font-weight: 700; }

.why-list { margin: 8px 0 0; padding-left: 22px; display: grid; gap: 8px; font-size: 14.5px; }
.why-list .adjust { background: var(--warn-bg); border-radius: 8px; padding: 8px 10px; }

/* ---------- learning ---------- */
.learning-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 14px 0;
}
@media (max-width: 560px) { .learning-grid { grid-template-columns: 1fr; } }
.learning-stat {
  background: #fafbf9;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
}
.stat-value { margin: 0; font-size: 30px; font-weight: 800; color: var(--accent); }
.stat-label { margin: 2px 0 0; font-size: 12.5px; color: var(--ink-faint); line-height: 1.35; }

.learn-explain {
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 14.5px;
  margin: 0 0 14px;
}

.report-details summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 14.5px;
  padding: 6px 2px;
}
.return-form { margin: 12px 0; display: grid; gap: 12px; }
.form-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
.return-form .btn { justify-self: start; }

.event-log { list-style: none; margin: 10px 0; padding: 0; display: grid; gap: 4px; font-size: 13px; color: var(--ink-soft); }
.event-log li { padding: 5px 10px; background: #fafbf9; border: 1px solid var(--line); border-radius: 7px; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--card);
  padding: 22px 0 30px;
  font-size: 14px;
  color: var(--ink-soft);
}
.site-footer p { margin: 0 0 6px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}