/* ── Variables: dark (default) ─────────────────────────────────────────── */
:root {
  --bg:        #0f1115;
  --panel:     #171a21;
  --panel-2:   #1e222b;
  --panel-3:   #242831;
  --fg:        #e6e8ec;
  --muted:     #8a93a6;
  --accent:    #7cc4ff;
  --border:    #272b35;
  --mono:      "SF Mono", Menlo, Consolas, "Cascadia Code", monospace;

  /* category colours */
  --cat-type:    #c5a3ff;
  --cat-strict:  #9ae6b4;
  --cat-missing: #f5c26b;
  --cat-module:  #7cc4ff;
  --cat-misc:    #ff9ec7;

  /* code blocks */
  --code-err-bg:  #2a1a1a;
  --code-fix-bg:  #0e2212;
}

/* ── Light theme override ──────────────────────────────────────────────── */
html.light {
  --bg:       #f8f9fb;
  --panel:    #ffffff;
  --panel-2:  #f0f2f5;
  --panel-3:  #e8eaee;
  --fg:       #1a1d24;
  --muted:    #636b7e;
  --accent:   #0072c6;
  --border:   #dde1e8;

  --code-err-bg: #fff0f0;
  --code-fix-bg: #f0fff4;
}

/* ── Reset ─────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Header ────────────────────────────────────────────────────────────── */
header {
  padding: 20px 32px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

header h1 {
  margin: 0 0 4px;
  font-size: 20px;
  font-weight: 700;
}

header #subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  max-width: 640px;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ── Main ──────────────────────────────────────────────────────────────── */
main {
  padding: 24px 32px 64px;
  max-width: 960px;
  margin: 0 auto;
}

/* ── Controls ──────────────────────────────────────────────────────────── */
.controls { margin-bottom: 20px; }

#search-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--fg);
  font-size: 15px;
  font-family: inherit;
  margin-bottom: 12px;
}
#search-input:focus { outline: none; border-color: var(--accent); }
#search-input::-webkit-search-cancel-button { -webkit-appearance: none; }

.category-wrap {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

#category-label {
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.categories {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.cat-btn {
  padding: 5px 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  cursor: pointer;
  font-family: inherit;
  transition: color 0.15s, background 0.15s;
}
.cat-btn:hover { color: var(--fg); }
.cat-btn.active {
  background: var(--accent);
  color: #0b1320;
  border-color: var(--accent);
  font-weight: 700;
}

.result-count {
  margin-left: auto;
  color: var(--muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

/* ── Select & label ────────────────────────────────────────────────────── */
select {
  padding: 7px 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
}
label {
  color: var(--muted);
  font-size: 11px;
}

/* ── Theme toggle ──────────────────────────────────────────────────────── */
.icon-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
  font-size: 16px;
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
}
.icon-btn:hover { color: var(--fg); }

/* ── List ──────────────────────────────────────────────────────────────── */
.list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.empty {
  text-align: center;
  color: var(--muted);
  padding: 56px 0;
  font-style: italic;
}

/* ── Error card ────────────────────────────────────────────────────────── */
.error-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

/* Left accent line by category */
.error-card.cat-type    { border-left: 3px solid var(--cat-type); }
.error-card.cat-strict  { border-left: 3px solid var(--cat-strict); }
.error-card.cat-missing { border-left: 3px solid var(--cat-missing); }
.error-card.cat-module  { border-left: 3px solid var(--cat-module); }
.error-card.cat-misc    { border-left: 3px solid var(--cat-misc); }

.card-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 14px 16px;
  cursor: pointer;
  user-select: none;
}
.card-header:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.card-left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  min-width: 76px;
}

.error-code {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.01em;
}

.category-badge {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 2px 6px;
  border-radius: 999px;
  font-weight: 600;
  background: var(--panel-2);
}
.cat-badge-type    { color: var(--cat-type); }
.cat-badge-strict  { color: var(--cat-strict); }
.cat-badge-missing { color: var(--cat-missing); }
.cat-badge-module  { color: var(--cat-module); }
.cat-badge-misc    { color: var(--cat-misc); }

.card-title {
  min-width: 0;
}
.title-en {
  font-size: 13px;
  font-weight: 600;
  color: var(--fg);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.title-ja {
  font-size: 12px;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.expand-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--muted);
  font-size: 11px;
  pointer-events: none; /* header handles click */
}

.chevron {
  display: inline-block;
  transition: transform 0.2s;
  font-style: normal;
}
.chevron.open { transform: rotate(90deg); }

.card-desc {
  padding: 0 16px 12px 110px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* ── Detail panel ──────────────────────────────────────────────────────── */
.card-detail {
  border-top: 1px solid var(--border);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.detail-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.detail-section {}

.detail-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 6px;
}

.causes-list {
  margin: 0;
  padding-left: 18px;
  font-size: 13px;
  color: var(--fg);
}
.causes-list li { margin-bottom: 2px; }

.code-block {
  margin: 0;
  padding: 10px 14px;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.55;
  overflow-x: auto;
  border: 1px solid var(--border);
}
.code-block code { background: none; }

.error-block { background: var(--code-err-bg); }
.fix-block   { background: var(--code-fix-bg); }

.flags-section {
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
}
.flags-list { display: flex; gap: 6px; flex-wrap: wrap; }

.flag {
  font-family: var(--mono);
  font-size: 11px;
  padding: 2px 7px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--accent);
}

/* ── Footer ────────────────────────────────────────────────────────────── */
footer {
  padding: 20px 32px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
  background: var(--panel);
}

/* ── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 700px) {
  header { padding: 16px 16px 12px; }
  main { padding: 16px 16px 48px; }

  .header-top { flex-direction: column; gap: 10px; }
  .header-controls { align-self: flex-end; }

  .card-header { grid-template-columns: auto 1fr auto; gap: 10px; }
  .card-desc { padding-left: 16px; }
  .detail-cols { grid-template-columns: 1fr; }
  .card-left { min-width: 66px; }
  .title-en, .title-ja { white-space: normal; }
}