:root {
  --bg: #f5f7fa;
  --panel: #ffffff;
  --ink: #1f2933;
  --muted: #61707d;
  --line: #dce3ea;
  --accent: #1f6feb;
  --accent-ink: #ffffff;
  --accent-soft: #eaf1fe;
  --ok: #1a7f37;
  --warn: #b54708;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .08), 0 1px 2px rgba(16, 24, 40, .06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC",
    "Noto Sans CJK JP", "Noto Sans CJK KR", sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }

/* ---------- Topbar ---------- */
#topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.tb-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
  letter-spacing: .2px;
}
.brand-sub { font-size: 12.5px; color: var(--muted); margin-left: 10px; }
/* Hide per-module intro paragraphs while keeping them for SEO/aria */
p.sub[data-i18n$="_desc"] { display: none; }
main.container h1 { margin-bottom: 18px; }
.tb-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.lang-wrap {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}
.lang-wrap select {
  font: inherit;
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}
.tb-btn {
  display: inline-block;
  padding: 7px 12px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  background: #fff;
  white-space: nowrap;
}
.tb-btn:hover { background: var(--accent-soft); }

/* ---------- Layout ---------- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 18px 60px;
}
.hero { text-align: center; padding: 18px 0 6px; }
.hero h1 { margin: 0 0 6px; font-size: 28px; }
.hero .sub { margin: 0; color: var(--muted); font-size: 16px; }
.hero .intro { margin: 10px auto 0; max-width: 640px; color: var(--muted); }

.back-link {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 14px;
}
h1 { font-size: 24px; margin: 6px 0 2px; }
p.sub { color: var(--muted); margin: 0 0 18px; }

/* ---------- Home cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 22px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  box-shadow: var(--shadow);
  color: var(--ink);
  position: relative;
  transition: transform .12s ease, border-color .12s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.card-go { position: absolute; right: 16px; bottom: 14px; color: var(--accent); font-weight: 700; }

/* ---------- Forms ---------- */
.form-grid {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(160px, 1fr);
  gap: 12px 18px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}
.form-grid label { font-weight: 600; }
.form-grid input,
.form-grid select {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  width: 100%;
}
.form-grid select { cursor: pointer; }
.btn-row { margin: 16px 0; display: flex; gap: 10px; }
.btn {
  padding: 9px 18px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.05); }
.btn.ghost { background: #fff; color: var(--accent); }

/* ---------- Tab bar (combined single-page modules) ---------- */
.tab-bar { display: flex; gap: 8px; margin: 4px 0 0; }
.tab-btn {
  padding: 9px 18px;
  border-radius: 8px 8px 0 0;
  border: 1px solid #c9ddfb;
  border-bottom: none;
  background: #eef3fb;
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.tab-btn.active { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.cr-sec { margin-top: 0; }
.cr-h { font-size: 15px; color: var(--accent); margin: 14px 0 8px; padding-bottom: 4px; border-bottom: 2px solid #c9ddfb; }
.cr-sec-sub { color: var(--muted, #61707d); font-size: 13px; margin: 0 0 10px; }
.share-input { width: 100%; max-width: 560px; padding: 6px 8px; border: 1px solid #c9ddfb; border-radius: 6px; font-size: 12px; color: #34404d; background: #f7fbff; }
.hidden { display: none !important; }

/* ---------- Result ---------- */
.result-card {
  background: var(--accent-soft);
  border: 1px solid #c9ddfb;
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-top: 8px;
}
.result-card h3 { margin: 0 0 10px; font-size: 16px; color: var(--accent); }
.res-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 0;
  border-top: 1px dashed #c9ddfb;
}
.res-row:first-of-type { border-top: none; }
.res-row span { color: var(--muted); }
.res-row b { font-variant-numeric: tabular-nums; }
.res-row.best { background: #dcebff; border-radius: 6px; padding-left: 8px; padding-right: 8px; color: var(--accent); }
.res-row.best span, .res-row.best b { color: var(--accent); font-weight: 600; }
.res-row.rank-row.clickable { cursor: pointer; transition: background .12s; }
.res-row.rank-row.clickable:hover { background: #eaf1fe; }
.res-row.pct-dev { background: #fff4e5; border-radius: 6px; padding: 8px; margin: 6px 0; border-top: none; }
.res-row.pct-dev span { color: #9a5b00; font-weight: 600; }
.res-row.pct-dev b { color: #c2410c; font-weight: 700; font-size: 15px; font-variant-numeric: tabular-nums; }
.pct-bad, .res-row.pct-dev b.pct-bad { color: #dc2626 !important; }
.res-row.rank-row.clickable:hover span, .res-row.rank-row.clickable:hover b { color: var(--accent); }

.note-ok { color: var(--ok); font-weight: 600; }
.note-warn { color: var(--warn); font-weight: 600; }

/* Global red banner: an override deviates from library by more than ±30% */
.banner-warn {
  background: #fdecec;
  border: 1px solid #f3b4b4;
  border-left: 4px solid #dc2626;
  color: #991b1b;
  font-weight: 600;
  border-radius: 6px;
  padding: 10px 12px;
  margin-top: 14px;
  line-height: 1.5;
}

/* Field-level change list inside a version-migration warning */
.mig-fields { margin-top: 6px; }
.mig-fields-h { display: block; font-weight: 700; color: #991b1b; margin-bottom: 2px; }
.mig-fields ul { margin: 2px 0 0; padding-left: 18px; }
.mig-fields li { color: #7f1d1d; font-weight: 500; line-height: 1.5; }
.note { color: var(--muted); font-size: 12.5px; margin-top: 10px; line-height: 1.5; }
.triple { display: flex; gap: 8px; align-items: center; }
.triple input { flex: 1; min-width: 0; }

.formula {
  margin-top: 22px;
  padding: 14px 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  color: var(--muted);
  font-size: 13.5px;
}

/* ---------- Footer ---------- */
#footer {
  background: var(--panel);
  border-top: 1px solid var(--line);
  margin-top: 40px;
}
.ft-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 18px;
}
.ft-inner .disc { margin: 0 0 6px; font-size: 12.5px; color: var(--muted); }
.ft-inner .ft-note { margin: 0; font-size: 12.5px; color: var(--muted); }

@media (max-width: 560px) {
  .form-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 22px; }
}

/* ---------- Consolidated report page ---------- */
.report-block {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-top: 16px;
  box-shadow: var(--shadow);
}
.rb-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  border-bottom: 2px solid var(--accent-soft);
  padding-bottom: 6px;
  margin-bottom: 10px;
}
.rb-head h3 { margin: 0; font-size: 17px; }
.rb-saved { color: var(--muted); font-size: 12.5px; }
.rb-meta { color: var(--muted); font-size: 12.5px; margin: 2px 0 8px; font-style: italic; }
.report-block .result-card { margin-top: 10px; }
.report-block .result-card h4 {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .4px;
}
.btn:disabled,
.btn.ghost:disabled {
  opacity: .5;
  cursor: not-allowed;
  filter: none;
}

/* ---------- Unit selector (length unit switch) ---------- */
.unit-sel {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
  margin-left: 6px;
}
.unit-sel select {
  font: inherit;
  padding: 7px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}
#rep-unit {
  font: inherit;
  padding: 6px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}