/**
 * IAG 铝行业知识库 · 主题页样式
 *
 * Earth & Ink 主题，与 main.css 协调
 * Phase E 包含 6 种 card 样式 + 错误卡 + 响应式
 */

:root {
  --paper: #f4ecde;
  --ink: #1a1814;
  --amber: #BA7517;
  --steel: #5a5a5a;
  --mute: #8a8478;
  --border: #d6c9b3;
  --hover: #ede2cc;
  --card-bg: #fdfaf3;
  --quote-bg: #fff8e8;
  --err: #b34040;
  --ok: #4a7a3c;
}

.topic-body {
  background: var(--paper);
  color: var(--ink);
  margin: 0;
  font: 15px/1.65 'Noto Serif SC', serif;
}

/* ---------- topbar ---------- */
.kb-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 32px;
  border-bottom: 2px solid var(--ink);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 50;
}
.kb-topbar .brand {
  font: 700 24px 'Cormorant Garamond', serif;
  color: var(--ink);
  text-decoration: none;
}
.kb-topbar nav a {
  color: var(--ink);
  text-decoration: none;
  margin-left: 24px;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s;
}
.kb-topbar nav a:hover {
  border-bottom-color: var(--amber);
}

/* ---------- main + head ---------- */
.topic-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 32px 80px;
}
.topic-head {
  margin-bottom: 32px;
}
.breadcrumb {
  color: var(--mute);
  font-size: 13px;
  margin-bottom: 8px;
  font-family: 'JetBrains Mono', monospace;
}
.breadcrumb .sep {
  margin: 0 6px;
  color: var(--border);
}
.topic-head h1 {
  font: 600 40px/1.2 'Cormorant Garamond', serif;
  margin: 0 0 8px;
  color: var(--ink);
}
.topic-sub {
  color: var(--steel);
  margin: 0 0 6px;
  font-size: 16px;
}
.data-asof {
  color: var(--mute);
  margin: 0;
  font-size: 13px;
  font-family: 'JetBrains Mono', monospace;
}

/* ---------- cards container ---------- */
#cards-container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  padding: 20px 24px;
  transition: box-shadow 0.15s;
}
.card:hover {
  box-shadow: 0 2px 8px rgba(26, 24, 20, 0.06);
}
.card-title {
  margin: 0 0 16px;
  font: 600 18px 'Cormorant Garamond', serif;
  color: var(--ink);
  letter-spacing: 0.02em;
}
.card.card-error {
  border-left-color: var(--err);
  background: #fdf3f3;
}
.card.card-error .muted {
  color: var(--err);
}

/* ---------- card_kpi_strip ---------- */
.card-kpi-strip {
  padding: 24px;
}
.kpi-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}
.kpi-item {
  padding: 12px;
  border-right: 1px solid var(--border);
}
.kpi-item:last-child { border-right: none; }
.kpi-label {
  color: var(--mute);
  font-size: 13px;
  margin-bottom: 6px;
}
.kpi-value {
  font: 600 32px/1 'JetBrains Mono', monospace;
  color: var(--ink);
}
.kpi-value .kpi-unit {
  font-size: 14px;
  color: var(--mute);
  margin-left: 4px;
  font-weight: 400;
}
.kpi-trend {
  font-size: 12px;
  margin-top: 4px;
  font-family: 'JetBrains Mono', monospace;
}
.kpi-trend.up { color: var(--ok); }
.kpi-trend.down { color: var(--err); }

/* ---------- card_chart ---------- */
.card-chart {
  padding: 20px;
}

/* ---------- card_data_table ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  font-size: 14px;
}
.data-table th,
.data-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.data-table th {
  background: var(--hover);
  font-weight: 600;
  white-space: nowrap;
  color: var(--steel);
  font-size: 13px;
}
.data-table tbody tr:hover {
  background: var(--paper);
}
.data-table .muted {
  color: var(--mute);
  font-size: 12px;
}
.muted.small {
  color: var(--mute);
  font-size: 12px;
  margin-top: 8px;
  text-align: right;
}

/* ---------- card_quote ---------- */
.card-quote {
  background: var(--quote-bg);
  border-left-color: var(--amber);
  border-left-width: 4px;
}
.card-quote blockquote {
  margin: 0;
  padding: 0;
  position: relative;
}
.quote-mark {
  font: 700 48px 'Cormorant Garamond', serif;
  color: var(--amber);
  position: absolute;
  top: -16px;
  left: -8px;
  line-height: 1;
  opacity: 0.6;
}
.quote-body {
  padding-left: 32px;
  padding-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}
.quote-body strong {
  color: var(--amber);
  font-weight: 600;
}
.quote-source {
  padding-left: 32px;
  padding-top: 16px;
  font-size: 12px;
  color: var(--mute);
  font-style: italic;
  font-family: 'JetBrains Mono', monospace;
}

/* ---------- card_related ---------- */
.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.related-link {
  color: var(--ink);
  text-decoration: none;
  padding: 8px 16px;
  background: var(--paper);
  border: 1px solid var(--border);
  font-size: 14px;
  transition: all 0.15s;
}
.related-link:hover {
  border-color: var(--amber);
  color: var(--amber);
  background: #fff;
}

/* ---------- card_sources ---------- */
.sources-list {
  padding-left: 24px;
  margin: 0;
}
.sources-list li {
  margin: 6px 0;
  font-size: 13px;
  color: var(--steel);
}
.sources-list a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--amber);
  text-underline-offset: 2px;
}
.sources-list a:hover {
  color: var(--amber);
}

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .topic-main {
    padding: 24px 16px 40px;
  }
  .topic-head h1 {
    font-size: 32px;
  }
  .kb-topbar {
    padding: 10px 16px;
    flex-wrap: wrap;
    gap: 8px;
  }
  .kb-topbar nav a {
    margin-left: 14px;
    font-size: 13px;
  }
  .card {
    padding: 16px;
  }
  .kpi-item {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding-bottom: 12px;
  }
  .kpi-item:last-child {
    border-bottom: none;
  }
  .kpi-value {
    font-size: 24px;
  }
}

/* ---------- card_kpi_grid (Phase F) ---------- */
.kpi-grid {
  display: grid;
  gap: 16px;
}
.kpi-grid-item {
  padding: 16px;
  background: #fff;
  border: 1px solid var(--border);
}
.kpi-grid-item .kpi-desc {
  color: var(--mute);
  font-size: 12px;
  margin-top: 6px;
  line-height: 1.4;
}

/* ---------- card_text (Phase F) ---------- */
.card-text .text-body {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}
.card-text .text-body p {
  margin: 0 0 12px;
}
.card-text .text-body strong {
  color: var(--amber);
}

/* ---------- card_timeline (Phase F) ---------- */
.timeline {
  position: relative;
  padding-left: 24px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
}
.tl-event {
  position: relative;
  padding-bottom: 20px;
}
.tl-event:last-child { padding-bottom: 0; }
.tl-marker {
  position: absolute;
  left: -20px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--amber);
  border: 3px solid var(--card-bg);
  border-radius: 50%;
  box-shadow: 0 0 0 1px var(--amber);
}
.tl-date {
  color: var(--amber);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  margin-bottom: 4px;
}
.tl-title {
  font-weight: 600;
  font-size: 16px;
  margin-bottom: 4px;
}
.tl-body {
  font-size: 14px;
  color: var(--steel);
  line-height: 1.6;
}
.tl-tags {
  margin-top: 8px;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.tl-tag {
  font-size: 12px;
  padding: 2px 8px;
  background: var(--paper);
  border: 1px solid var(--border);
  color: var(--steel);
  font-family: 'JetBrains Mono', monospace;
}

/* ---------- card_comparison (Phase F) ---------- */
.comparison {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  align-items: stretch;
}
.cmp-side {
  padding: 16px;
  background: #fff;
  border: 1px solid var(--border);
}
.cmp-left { border-left: 3px solid var(--amber); }
.cmp-right { border-left: 3px solid var(--steel); }
.cmp-name {
  margin: 0 0 4px;
  font: 600 18px 'Cormorant Garamond', serif;
  color: var(--ink);
}
.cmp-subtitle {
  color: var(--mute);
  font-size: 13px;
  margin-bottom: 12px;
}
.cmp-rows { display: flex; flex-direction: column; gap: 6px; }
.cmp-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 14px;
}
.cmp-row:last-child { border-bottom: none; }
.cmp-label { color: var(--steel); }
.cmp-val { color: var(--ink); font-family: 'JetBrains Mono', monospace; }
.cmp-vs {
  display: flex;
  align-items: center;
  justify-content: center;
  font: italic 600 18px 'Cormorant Garamond', serif;
  color: var(--mute);
  padding: 0 8px;
}

/* ---------- card_flow_diagram (Phase F) ---------- */
.card-flow {
  padding: 20px;
}

/* ---------- card_image (Phase F) ---------- */
.img-figure {
  margin: 0;
  text-align: center;
}
.img-figure img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
}
.img-caption {
  color: var(--mute);
  font-size: 13px;
  margin-top: 8px;
  font-style: italic;
}

/* ---------- responsive (Phase F additions) ---------- */
@media (max-width: 720px) {
  .comparison {
    grid-template-columns: 1fr;
  }
  .cmp-vs {
    padding: 4px;
  }
}