/* ============================================================
   AI 编程套餐价格指数 · Fathom 期刊风格
   灰白底 / 海军蓝 / 锈红点缀 / 细线网格 / 表格密度
   ============================================================ */

:root {
  --bg: #F5F5F1;
  --panel: #FCFCFA;
  --ink: #1A2433;
  --ink-2: #3E4857;
  --gray: #6B7280;
  --line: #DCDAD2;
  --line-strong: #B3B0A6;
  --brand: #0D9488;
  --brand-2: #14B8A6;
  --brand-soft: #E6F4F2;
  --navy: #1C3A5E;
  --navy-2: #2C4A6E;
  --navy-soft: #E9EEF4;
  --rust: #A64B2A;
  --rust-soft: #F5EAE3;
  --ok: #2E6B4F;
  --ok-soft: #E8F0EA;
  --warn: #8A6100;
  --warn-soft: #F6EFDC;
  --font-sans: "IBM Plex Sans", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "Cascadia Code", Consolas, "JetBrains Mono", ui-monospace, monospace;
  --radius: 0;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 15px; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--navy); text-decoration: none; border-bottom: 1px solid transparent; }
a:hover { border-bottom-color: var(--navy); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--rust); outline-offset: 2px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  border-bottom: 1px solid var(--line-strong);
  background: var(--bg);
}
.header-inner {
  max-width: 1440px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 8px 24px;
}
.brand { display: flex; align-items: baseline; gap: 12px; padding: 18px 0 14px; }
.brand-name { font-size: 1.18rem; font-weight: 700; letter-spacing: 0.01em; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; margin-right: 8px; vertical-align: -6px;
}
.brand-mark svg { width: 26px; height: 26px; display: block; }
.brand-en { font-size: 0.72rem; color: var(--gray); font-family: var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; }
.main-nav { display: flex; gap: 4px; flex-wrap: wrap; padding-bottom: 0; }
.main-nav a {
  display: inline-block; padding: 10px 14px 12px; font-size: 0.92rem; color: var(--ink-2);
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.main-nav a:hover { border-bottom-color: var(--line-strong); color: var(--ink); }
.main-nav a.active { border-bottom-color: var(--navy); color: var(--navy); font-weight: 600; }
.main-nav a .cnt { font-family: var(--font-mono); font-size: 0.75rem; color: var(--gray); margin-left: 4px; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line-strong); margin-top: 72px; background: var(--bg); }
.footer-inner { max-width: 1440px; margin: 0 auto; padding: 28px 24px 48px; color: var(--gray); font-size: 0.82rem; }
.footer-inner .disclaimer { margin-bottom: 10px; max-width: 860px; }
.footer-inner a { color: var(--ink-2); }
.footer-meta { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 14px; font-family: var(--font-mono); font-size: 0.75rem; }

/* ---------- 通用容器 ---------- */
.page { max-width: 1440px; margin: 0 auto; padding: 0 24px; }

/* ---------- 首页 Hero ---------- */
.hero { padding: 56px 0 36px; border-bottom: 1px solid var(--line); }
.hero .kicker {
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--rust); margin-bottom: 18px;
}
.hero h1 { font-size: 2.9rem; line-height: 1.22; font-weight: 800; letter-spacing: 0.01em; font-family: var(--font-display); max-width: 820px; }
.hero h1 .brand { color: var(--brand); }
.hero .kicker {
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--brand); margin-bottom: 18px;
}
.hero .lede { margin-top: 18px; max-width: 680px; color: var(--ink-2); font-size: 1.02rem; }
.hero .lede a { text-decoration: underline; text-underline-offset: 3px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.hero-actions .btn-primary {
  display: inline-block; background: var(--ink); color: #fff; border: 1px solid var(--ink);
  padding: 12px 24px; font-size: 0.95rem; font-weight: 600;
}
.hero-actions .btn-primary:hover { background: var(--brand); border-color: var(--brand); color: #fff; }
.hero-actions .btn-ghost {
  display: inline-block; background: transparent; color: var(--ink); border: 1px solid var(--line-strong);
  padding: 12px 24px; font-size: 0.95rem; font-weight: 600;
}
.hero-actions .btn-ghost:hover { border-color: var(--ink); }

/* 指标块 */
.metrics {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  border: 1px solid var(--line-strong); margin-top: 36px; background: var(--panel);
}
.metric { padding: 18px 22px; border-right: 1px solid var(--line); }
.metric:last-child { border-right: none; }
.metric .num { font-size: 2rem; font-weight: 800; font-family: var(--font-mono); color: var(--navy); font-variant-numeric: tabular-nums; }
.metric .num small { font-size: 1rem; color: var(--gray); }
.metric .label { font-size: 0.8rem; color: var(--gray); margin-top: 2px; }

/* 频道卡 */
.channels-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border: 1px solid var(--line-strong); margin-top: 48px; background: var(--panel); }
.channel-card { padding: 28px 26px; border-right: 1px solid var(--line); display: flex; flex-direction: column; gap: 10px; transition: background .15s; position: relative; }
.channel-card:last-child { border-right: none; }
.channel-card:hover { background: var(--brand-soft); }
.channel-card .cc-icon { width: 40px; height: 40px; display: inline-flex; align-items: center; justify-content: center; background: var(--brand-soft); border: 1px solid #CDE8DC; }
.channel-card .cc-icon svg { width: 22px; height: 22px; }
.channel-card .cc-no { font-family: var(--font-mono); font-size: 0.75rem; color: var(--brand); letter-spacing: 0.1em; }
.channel-card h2 { font-size: 1.3rem; font-weight: 700; font-family: var(--font-display); }
.channel-card .cc-desc { color: var(--ink-2); font-size: 0.9rem; min-height: 2.9em; }
.channel-card .cc-meta { font-family: var(--font-mono); font-size: 0.78rem; color: var(--gray); }
.channel-card .cc-go { margin-top: auto; font-size: 0.9rem; font-weight: 600; color: var(--navy); }
.channel-card .cc-go .arrow { font-family: var(--font-mono); margin-left: 6px; transition: margin .15s; }
.channel-card:hover .cc-go .arrow { margin-left: 12px; }

/* 区块标题 */
.section { margin-top: 56px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; border-bottom: 1px solid var(--line-strong); padding-bottom: 10px; margin-bottom: 20px; flex-wrap: wrap; }
.section-head h2 { font-size: 1.5rem; font-weight: 800; font-family: var(--font-display); }
.section-head .sh-note { color: var(--gray); font-size: 0.85rem; }

/* 引用块 / 方法说明 */
.method-box { border: 1px solid var(--line); background: var(--panel); padding: 22px 26px; font-size: 0.92rem; color: var(--ink-2); }
.method-box ol { margin: 10px 0 0 18px; display: grid; gap: 6px; }
.method-box strong { color: var(--ink); }
.footnote { font-family: var(--font-mono); font-size: 0.74rem; color: var(--gray); margin-top: 12px; }

/* 提示横幅 */
.notice-bar {
  border: 1px solid #BFE3D8; background: var(--brand-soft);
  padding: 12px 18px; margin: 18px 0 0; font-size: 0.9rem; color: var(--ink-2); line-height: 1.6;
}
.notice-bar strong { color: #0B6B5F; }
.notice-bar b { color: #0B6B5F; }
.notice-bar a { color: #0B6B5F; font-weight: 600; border-bottom: 1px solid #8FD0BF; }

/* ---------- 频道页 ---------- */
.channel-hero { padding: 40px 0 28px; border-bottom: 1px solid var(--line-strong); margin-bottom: 28px; }
.channel-hero .kicker { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--rust); }
.channel-hero h1 { font-size: 2rem; font-weight: 800; margin: 10px 0 8px; font-family: var(--font-display); }
.channel-hero .lede { color: var(--ink-2); max-width: 720px; font-size: 0.98rem; }
.channel-hero .meta-row { display: flex; flex-wrap: wrap; gap: 8px 28px; margin-top: 16px; font-family: var(--font-mono); font-size: 0.78rem; color: var(--gray); }
.channel-hero .meta-row .dot { width: 7px; height: 7px; border-radius: 50%; display: inline-block; margin-right: 6px; }
.dot-ok { background: var(--ok); } .dot-warn { background: var(--warn); }

/* 工具栏 */
.toolbar {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  padding: 14px 16px; border: 1px solid var(--line-strong); background: var(--panel);
  position: sticky; top: 0; z-index: 20; margin-bottom: 20px;
}
.toolbar .search { flex: 1 1 220px; display: flex; align-items: center; border: 1px solid var(--line-strong); background: #fff; }
.toolbar .search input { flex: 1; border: none; padding: 9px 12px; font-size: 0.9rem; background: transparent; color: var(--ink); min-width: 120px; }
.toolbar .search .s-icon { padding: 0 10px; color: var(--gray); font-family: var(--font-mono); }
.toolbar select {
  padding: 8px 10px; border: 1px solid var(--line-strong); background: #fff; color: var(--ink);
  font-size: 0.85rem; font-family: var(--font-sans); cursor: pointer;
}
.toolbar .spacer { flex: 1; }
.toolbar .tb-hint { font-size: 0.78rem; color: var(--gray); font-family: var(--font-mono); }
.toolbar .count-badge { font-family: var(--font-mono); font-size: 0.78rem; padding: 4px 10px; background: var(--navy-soft); color: var(--navy); }

/* 表格 */
.table-wrap { border: 1px solid var(--line-strong); background: var(--panel); overflow-x: auto; }
table.plans { width: 100%; border-collapse: collapse; font-size: 0.95rem; min-width: 1300px; }
table.plans th {
  text-align: left; font-size: 0.75rem; font-family: var(--font-mono); letter-spacing: 0.07em;
  text-transform: uppercase; color: var(--gray); font-weight: 600;
  padding: 8px 10px; border-bottom: 1px solid var(--line-strong); background: var(--bg); white-space: nowrap;
}
table.plans td { padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; line-height: 1.45; }
table.plans tbody tr.vendor-row td {
  background: var(--navy-soft); border-bottom: 1px solid var(--line-strong);
  padding: 8px 12px; font-weight: 700; color: var(--navy); font-size: 0.95rem;
}
table.plans tbody tr.vendor-row .v-sub { font-weight: 400; color: var(--gray); font-size: 0.8rem; font-family: var(--font-mono); margin-left: 10px; }
table.plans tbody tr.plan-row:hover { background: #F9F9F5; }
table.plans tr.plan-row:last-child td { border-bottom: none; }

.cell-plan { font-weight: 600; }
.cell-plan .p-note { display: block; font-weight: 400; color: var(--gray); font-size: 0.8rem; margin-top: 2px; max-width: 260px; }
.cell-price { font-family: var(--font-mono); font-size: 1.15rem; font-weight: 700; color: var(--navy); white-space: nowrap; font-variant-numeric: tabular-nums; }
.cell-price .cur { font-size: 0.8rem; color: var(--gray); font-weight: 400; margin-right: 2px; }
.cell-price .unit { display: block; font-size: 0.75rem; color: var(--gray); font-weight: 400; max-width: 210px; white-space: normal; }
.cell-price.pending { color: var(--gray); font-weight: 500; }
.cell-quota { max-width: 460px; color: var(--ink-2); font-size: 0.9rem; line-height: 1.5; white-space: normal; }
.cell-links { white-space: nowrap; }
.cell-links .btn { display: inline-block; font-size: 0.82rem; padding: 4px 10px; border: 1px solid var(--navy); color: var(--navy); margin-right: 6px; }
.cell-links .btn:hover { background: var(--navy); color: #fff; border-bottom-color: var(--navy); }
.cell-links .btn.btn-ghost { border-color: var(--line-strong); color: var(--ink-2); }
.cell-links .btn.btn-ghost:hover { background: var(--ink); color: #fff; border-color: var(--ink); }
.cell-links .src { display: block; margin-top: 6px; font-family: var(--font-mono); font-size: 0.7rem; color: var(--gray); }
.cell-links .src a { color: var(--gray); border-bottom: 1px dotted var(--line-strong); }
.cell-links .src a:hover { color: var(--ink); }

.badge { display: inline-block; font-size: 0.68rem; font-family: var(--font-mono); padding: 2px 7px; letter-spacing: 0.03em; }
.badge-ok { background: var(--ok-soft); color: var(--ok); border: 1px solid #CFE0D4; }
.badge-pending { background: var(--warn-soft); color: var(--warn); border: 1px solid #E5D9B8; }
.badge-currency { background: var(--bg); color: var(--gray); border: 1px solid var(--line); margin-left: 6px; }
.badge-billing { background: var(--rust-soft); color: var(--rust); border: 1px solid #E4CFC2; margin-left: 6px; }

/* 对比选择 */
.cmp { width: 18px; height: 18px; accent-color: var(--navy); cursor: pointer; }
tr.plan-row.selected td { background: var(--rust-soft); }

/* 对比面板 */
.compare-panel {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 50;
  background: var(--panel); border-top: 2px solid var(--navy);
  box-shadow: 0 -6px 24px rgba(26, 36, 51, 0.12);
  max-height: 62vh; display: flex; flex-direction: column;
}
.compare-panel .cp-head { display: flex; align-items: center; gap: 14px; padding: 10px 24px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.compare-panel .cp-title { font-weight: 700; font-size: 0.95rem; }
.compare-panel .cp-count { font-family: var(--font-mono); font-size: 0.78rem; color: var(--gray); }
.compare-panel .cp-close { margin-left: auto; border: 1px solid var(--line-strong); background: #fff; padding: 4px 12px; cursor: pointer; font-size: 0.8rem; }
.compare-panel .cp-body { overflow: auto; padding: 0 24px 16px; }
.compare-panel table { border-collapse: collapse; width: 100%; min-width: 720px; font-size: 0.85rem; }
.compare-panel table th { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line-strong); color: var(--gray); font-size: 0.72rem; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.06em; white-space: nowrap; }
.compare-panel table td { padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.compare-panel table td.k { color: var(--gray); font-size: 0.72rem; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.06em; white-space: nowrap; width: 88px; }

/* ---------- 移动端卡片布局 ---------- */
.mobile-cards { display: none; }
@media (max-width: 720px) {
  .table-wrap { display: none; }
  .mobile-cards { display: grid; gap: 12px; }
  .plan-card {
    border: 1px solid var(--line-strong); background: var(--panel); padding: 16px;
  }
  .plan-card .pc-top { display: flex; justify-content: space-between; gap: 10px; align-items: baseline; }
  .plan-card .pc-vendor { font-size: 0.78rem; color: var(--gray); }
  .plan-card .pc-name { font-weight: 700; font-size: 1.02rem; margin: 4px 0 8px; }
  .plan-card .pc-price { font-family: var(--font-mono); font-size: 1.3rem; font-weight: 700; color: var(--navy); white-space: nowrap; }
  .plan-card .pc-price .cur { font-size: 0.8rem; color: var(--gray); font-weight: 400; }
  .plan-card .pc-price.pending { color: var(--gray); font-weight: 500; font-size: 1rem; }
  .plan-card .pc-price .unit { display: block; font-size: 0.7rem; color: var(--gray); font-weight: 400; }
  .plan-card dl { margin: 10px 0; }
  .plan-card dl div { display: flex; gap: 8px; padding: 4px 0; border-top: 1px dashed var(--line); font-size: 0.85rem; }
  .plan-card dl dt { flex: 0 0 76px; color: var(--gray); font-size: 0.72rem; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.05em; padding-top: 2px; }
  .plan-card dl dd { color: var(--ink-2); }
  .plan-card .pc-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
  .plan-card .pc-links .btn { margin-right: 0; }
  .plan-card .pc-src { margin-top: 8px; font-family: var(--font-mono); font-size: 0.7rem; color: var(--gray); }
  .plan-card .pc-cmp { display: flex; align-items: center; gap: 8px; margin-top: 10px; font-size: 0.8rem; color: var(--ink-2); border-top: 1px solid var(--line); padding-top: 10px; cursor: pointer; }
  .plan-card .pc-badges { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
}

/* 空态 / 待核实占位 */
.empty-state { border: 1px dashed var(--line-strong); padding: 48px 24px; text-align: center; color: var(--gray); }
.empty-state .es-title { font-weight: 700; color: var(--ink-2); margin-bottom: 6px; }

/* 响应式 */
@media (max-width: 900px) {
  .channels-grid { grid-template-columns: 1fr; }
  .channel-card { border-right: none; border-bottom: 1px solid var(--line); }
  .channel-card:last-child { border-bottom: none; }
  .hero h1 { font-size: 1.9rem; }
  .compare-panel { max-height: 70vh; }
}
@media (max-width: 640px) {
  .header-inner, .page { padding-left: 16px; padding-right: 16px; }
  .brand-en { display: none; }
  .hero { padding-top: 36px; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .metric:nth-child(2) { border-right: none; }
  .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .toolbar { position: static; }
  .toolbar .search { flex: 1 1 100%; }
}

/* 打印 */
@media print {
  .site-header .main-nav, .toolbar, .compare-panel, .cell-links .btn { display: none; }
  body { background: #fff; }
}