/* GradePlot —— 设计 tokens（Stitch 定稿后回填精确值；当前为 v1 家族风格基线） */
@font-face {
  font-family: 'Inter';
  src: url('/assets/fonts/Inter-latin.woff2') format('woff2');
  font-weight: 100 900;
  font-display: swap;
}
@font-face {
  font-family: 'Newsreader';
  src: url('/assets/fonts/Newsreader-700-latin.woff2') format('woff2');
  font-weight: 700;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('/assets/fonts/JetBrainsMono-latin.woff2') format('woff2');
  font-weight: 400 700;
  font-display: swap;
}

:root {
  --primary: #0f766e;          /* deep teal */
  --primary-dark: #115e59;
  --primary-tint: #f0fdfa;
  --ink: #0f172a;
  --slate: #475569;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --warn-bg: #fffbeb;
  --warn-line: #f59e0b;
  --warn-ink: #92400e;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .05), 0 4px 16px rgba(15, 23, 42, .06);
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-display: 'Newsreader', Georgia, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
}
main { max-width: 1120px; margin: 0 auto; padding: 24px 20px 64px; }
h1 { font-family: var(--font-display); font-size: clamp(30px, 4.5vw, 44px); line-height: 1.15; margin: 0 0 12px; letter-spacing: -0.01em; }
h2 { font-size: 20px; margin: 0 0 12px; }
h3 { font-size: 16px; margin: 16px 0 8px; }
a { color: var(--primary-dark); }
.lede { font-size: 18px; color: var(--slate); max-width: 720px; margin: 0 0 24px; }
.num, .result-gpa, td.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* —— 页眉/页脚 —— */
.site-header {
  display: flex; align-items: center; gap: 24px;
  max-width: 1120px; margin: 0 auto; padding: 16px 20px;
  border-bottom: 1px solid var(--line);
}
.wordmark { font-family: var(--font-display); font-size: 24px; font-weight: 700; color: var(--ink); text-decoration: none; }
.wordmark em { color: var(--primary); font-style: normal; }
.site-header nav { display: flex; gap: 18px; flex: 1; }
.site-header nav a { color: var(--slate); text-decoration: none; font-size: 15px; padding: 8px 4px; display: inline-block; min-height: 44px; }
.site-header nav a:hover { color: var(--primary-dark); }
.header-mail { font-size: 14px; color: var(--muted); text-decoration: none; }
.site-footer { border-top: 1px solid var(--line); background: var(--bg-soft); margin-top: 48px; }
.footer-grid { max-width: 1120px; margin: 0 auto; padding: 32px 20px 8px; display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 24px; }
.site-footer h2 { font-size: 14px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.site-footer a { display: block; color: var(--slate); text-decoration: none; padding: 4px 0; min-height: 32px; }
.footer-line { max-width: 1120px; margin: 0 auto; padding: 16px 20px 28px; color: var(--muted); font-size: 13px; }

/* —— 计算器卡 —— */
.calc-card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 24px; margin: 24px 0 32px;
}
.calc-tabs { display: inline-flex; gap: 4px; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 999px; padding: 4px; margin-bottom: 20px; }
.calc-tabs [role=tab] {
  border: 0; background: transparent; padding: 8px 18px; border-radius: 999px;
  font: inherit; font-size: 14px; color: var(--slate); cursor: pointer; min-height: 40px;
}
.calc-tabs [role=tab][aria-selected=true] { background: var(--primary); color: #fff; }
.course-rows { display: grid; gap: 10px; margin-bottom: 12px; }
.course-row { display: grid; grid-template-columns: 1.4fr 1fr .8fr auto; gap: 10px; align-items: center; }
.course-row input, .course-row select, .field-grid input, .field-pair input {
  font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: var(--radius-sm);
  min-height: 44px; width: 100%;
}
.course-row input:focus, .course-row select:focus, .field-grid input:focus, .field-pair input:focus,
#school-filter:focus { outline: 2px solid var(--primary); outline-offset: 1px; border-color: var(--primary); }
.course-row [data-del] {
  border: 0; background: transparent; color: var(--muted); font-size: 20px; cursor: pointer;
  width: 44px; height: 44px; border-radius: var(--radius-sm);
}
.course-row [data-del]:hover { background: var(--bg-soft); color: var(--ink); }
.add-row {
  border: 1.5px dashed var(--line); background: transparent; color: var(--slate); border-radius: var(--radius-sm);
  padding: 10px; width: 100%; font: inherit; cursor: pointer; min-height: 44px;
}
.add-row:hover { border-color: var(--primary); color: var(--primary-dark); }
.field-pair, .field-grid { display: grid; gap: 12px; margin-bottom: 14px; }
.field-pair { grid-template-columns: 1fr 1fr; }
.field-grid { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.field-pair label, .field-grid label { font-size: 14px; color: var(--slate); display: grid; gap: 6px; }
.pane-note { font-size: 14px; color: var(--muted); margin: 0 0 10px; }

.calc-result { margin-top: 18px; padding: 16px 18px; border-radius: var(--radius-sm); background: var(--primary-tint); border-left: 3px solid var(--primary); }
.result-label { margin: 0; font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--primary-dark); }
.result-gpa { font-size: 40px; font-weight: 700; margin: 2px 0; color: var(--primary-dark); }
.result-main { margin: 0 0 4px; font-size: 17px; }
.result-sub { margin: 0; color: var(--slate); font-size: 14px; }
.result-empty, .result-error { margin: 0; color: var(--slate); }
.result-error { color: #b91c1c; }
.chip-warn { display: inline-block; margin: 8px 0 0; background: var(--warn-bg); color: var(--warn-ink); border: 1px solid var(--warn-line); border-radius: 999px; padding: 4px 12px; font-size: 13px; }
.calc-math { margin-top: 14px; }
.math-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.math-table td { padding: 6px 8px; border-bottom: 1px solid var(--line); text-align: left; }
.math-table td.num { text-align: right; }
.math-table tfoot td { font-weight: 600; border-bottom: 0; }
.ignored-note { font-size: 13px; color: var(--warn-ink); background: var(--warn-bg); border-radius: var(--radius-sm); padding: 8px 12px; }
.calc-actions { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.btn-primary {
  background: var(--primary); color: #fff; border: 0; border-radius: var(--radius-sm);
  font: inherit; font-weight: 600; padding: 11px 20px; cursor: pointer; min-height: 44px;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost {
  background: transparent; color: var(--primary-dark); border: 1px solid var(--line); border-radius: var(--radius-sm);
  font: inherit; padding: 11px 20px; cursor: pointer; min-height: 44px;
}
.calc-saves { margin-top: 22px; border-top: 1px solid var(--line); padding-top: 16px; }
.saves-title { font-size: 15px; }
.saves-hint { font-weight: 400; color: var(--muted); font-size: 12px; margin-left: 8px; }
.calc-saves ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.calc-saves li { display: flex; gap: 6px; align-items: center; }
.save-item {
  flex: 1; text-align: left; background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 9px 12px; font: inherit; font-size: 13px; color: var(--slate); cursor: pointer; min-height: 40px;
}
.save-item:hover { border-color: var(--primary); }
.calc-saves [data-wipe] { border: 0; background: transparent; color: var(--muted); width: 40px; height: 40px; font-size: 18px; cursor: pointer; border-radius: var(--radius-sm); }
.saves-empty { color: var(--muted); font-size: 14px; }

/* —— 学校页 —— */
.breadcrumb { font-size: 14px; color: var(--muted); margin: 8px 0 16px; }
.state-badge {
  display: inline-block; vertical-align: middle; font: 600 13px var(--font-body);
  border: 1px solid var(--line); color: var(--slate); border-radius: 999px; padding: 3px 10px; margin-left: 8px;
}
.state-badge.sm { font-size: 11px; padding: 1px 8px; margin-left: 6px; }
.school-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 24px; align-items: start; }
.school-grid .calc-card { margin-top: 0; }
.side-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; background: var(--bg); }
.scale-table { width: 100%; border-collapse: collapse; font-size: 15px; }
.scale-table th { text-align: left; font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); padding: 8px 10px; border-bottom: 2px solid var(--line); }
.scale-table td { padding: 9px 10px; border-bottom: 1px solid var(--line); }
.scale-table td.num { text-align: right; }
.source-line { font-size: 13px; color: var(--muted); margin: 12px 0 0; word-break: break-all; }
.cross-line { font-size: 13px; color: var(--muted); margin: 6px 0 0; }
.note-card ul { margin: 0; padding-left: 18px; color: var(--slate); font-size: 14px; }
.note-card li { margin-bottom: 8px; }
.disclaimer { background: var(--warn-bg); border-radius: var(--radius-sm); padding: 10px 12px; font-size: 13px; color: var(--warn-ink); }

/* —— 首页 —— */
.hero-title { max-width: 760px; }
.school-search { margin: 32px 0; }
#school-filter {
  width: 100%; font: inherit; padding: 13px 16px; border: 1.5px solid var(--line); border-radius: var(--radius);
  min-height: 48px; margin-bottom: 14px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.chip { border: 1px solid var(--line); border-radius: 999px; padding: 7px 14px; font-size: 14px; color: var(--slate); text-decoration: none; min-height: 40px; display: inline-flex; align-items: center; }
.chip:hover { border-color: var(--primary); color: var(--primary-dark); }
.school-list { list-style: none; margin: 0; padding: 0; columns: 2; column-gap: 32px; }
.school-list li { break-inside: avoid; padding: 7px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.trust-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 32px 0; }
.trust-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; background: var(--bg-soft); }
.trust-card p { color: var(--slate); font-size: 14px; margin: 0; }

/* —— FAQ —— */
.faq { margin-top: 40px; max-width: 800px; }
.faq details { border-bottom: 1px solid var(--line); padding: 4px 0; }
.faq summary { cursor: pointer; font-weight: 600; padding: 12px 0; min-height: 44px; list-style-position: inside; }
.faq summary::marker { color: var(--primary); }
.faq details p { margin: 0 0 14px; color: var(--slate); }

@media (max-width: 860px) {
  .school-grid { grid-template-columns: 1fr; }
  .school-list { columns: 1; }
  .course-row { grid-template-columns: 1fr 1fr; }
  .course-row [data-name] { grid-column: 1 / -1; }
  .field-pair { grid-template-columns: 1fr; }
  .site-header { flex-wrap: wrap; gap: 8px 16px; }
  .header-mail { display: none; }
}

@media print {
  .site-header, .site-footer, .calc-actions, .calc-saves, .add-row, .course-row [data-del], .calc-tabs, .chips, #school-filter { display: none !important; }
  .calc-card, .side-card { border: 0; box-shadow: none; padding: 0; }
  details { display: block; }
  details > * { display: block; }
}