/* ===== Karaithy Tools 工具库 · 共享样式 ===== */
:root {
  --ink: #1a1a2e;
  --ink-2: #4b5563;
  --ink-3: #9ca3af;
  --line: #e8eaf0;
  --bg: #fbfbfd;
  --panel: #ffffff;
  --brand: #d97706;        /* karaithy 暖橙 */
  --brand-hover: #f59e0b;
  --brand-soft: #fff7ed;
  --blue: #2563eb;
  --green: #16a34a;
  --red: #dc2626;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(20,20,40,.05), 0 8px 28px rgba(20,20,40,.06);
  --shadow-hover: 0 4px 12px rgba(20,20,40,.08), 0 18px 48px rgba(20,20,40,.1);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Noto Sans SC', -apple-system, system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-hover); }

/* 品牌字标 */
.brand-mark { font-weight: 800; letter-spacing: -.5px; }
.brand-mark .ai { color: var(--brand); }

/* 顶栏 */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251,251,253,.82);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1160px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; gap: 16px;
}
.topbar .logo { font-size: 19px; }
.topbar nav { margin-left: auto; display: flex; gap: 22px; font-size: 14px; }
.topbar nav a { color: var(--ink-2); font-weight: 500; }
.topbar nav a:hover { color: var(--brand); }

/* 容器 */
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.wrap-narrow { max-width: 820px; margin: 0 auto; padding: 0 24px; }

/* Hero */
.hero { padding: 76px 0 52px; }
.hero h1 { font-size: 44px; line-height: 1.15; margin: 0 0 16px; letter-spacing: -1px; }
.hero .lead { font-size: 18px; color: var(--ink-2); max-width: 640px; margin: 0; }
.hero .eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: 2px;
  color: var(--brand); text-transform: uppercase; margin-bottom: 16px;
}

/* 工具卡片网格 */
.tool-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px; padding: 8px 0 80px;
}
.tool-card {
  display: block; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s, border-color .2s; color: inherit;
}
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: #d9dbe4; color: inherit; }
.tool-card .ico {
  width: 48px; height: 48px; border-radius: 12px; display: flex;
  align-items: center; justify-content: center; font-size: 24px; margin-bottom: 16px;
  background: var(--brand-soft);
}
.tool-card h3 { margin: 0 0 6px; font-size: 19px; }
.tool-card .meta { font-size: 12.5px; color: var(--ink-3); margin-bottom: 10px; display: flex; gap: 8px; flex-wrap: wrap; }
.tool-card .tag {
  font-size: 11.5px; padding: 2px 9px; border-radius: 20px;
  background: #f1f3f8; color: var(--ink-2);
}
.tool-card .tag.cat { background: var(--brand-soft); color: var(--brand); }
.tool-card p { margin: 0; font-size: 14px; color: var(--ink-2); }
.tool-card .arrow { margin-top: 14px; font-size: 13px; color: var(--brand); font-weight: 600; }

/* 占位卡 */
.tool-card.placeholder {
  border-style: dashed; box-shadow: none; background: transparent;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; color: var(--ink-3); min-height: 180px;
}
.tool-card.placeholder:hover { transform: none; }

/* 区块标题 */
.section-eyebrow { font-size: 13px; font-weight: 600; letter-spacing: 1.5px; color: var(--ink-3); text-transform: uppercase; margin-bottom: 6px; }

/* ===== 工具详情页 ===== */
.article { padding: 48px 0 96px; }
.article .back { font-size: 14px; color: var(--ink-2); display: inline-block; margin-bottom: 28px; }
.article h1 { font-size: 38px; line-height: 1.2; margin: 0 0 10px; letter-spacing: -.5px; }
.article .subtitle { font-size: 18px; color: var(--ink-2); margin: 0 0 24px; }
.article .doc-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 36px; }
.article .doc-meta .pill {
  font-size: 12.5px; padding: 4px 12px; border-radius: 20px;
  background: #f1f3f8; color: var(--ink-2);
}
.article .doc-meta .pill.cat { background: var(--brand-soft); color: var(--brand); font-weight: 600; }
.article h2 {
  font-size: 25px; margin: 52px 0 16px; padding-top: 8px; letter-spacing: -.3px;
  scroll-margin-top: 80px;
}
.article h2 .num { color: var(--brand); font-weight: 700; margin-right: 10px; }
.article h3 { font-size: 18px; margin: 28px 0 10px; }
.article p { font-size: 15.5px; color: #2b3040; margin: 0 0 16px; }
.article ul, .article ol { font-size: 15.5px; color: #2b3040; padding-left: 22px; }
.article li { margin: 7px 0; }
.article strong { color: var(--ink); }

/* 速览卡 */
.spec-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px; margin: 24px 0 8px;
}
.spec-item { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; }
.spec-item .k { font-size: 12.5px; color: var(--ink-3); margin-bottom: 4px; }
.spec-item .v { font-size: 15px; font-weight: 600; color: var(--ink); }

/* 提示框 */
.callout {
  border-left: 3px solid var(--brand); background: var(--brand-soft);
  border-radius: 0 10px 10px 0; padding: 16px 20px; margin: 22px 0; font-size: 15px;
}
.callout.blue { border-left-color: var(--blue); background: #eff5ff; }
.callout.green { border-left-color: var(--green); background: #f0fdf4; }
.callout.red { border-left-color: var(--red); background: #fef2f2; }
.callout .label { font-weight: 700; display: block; margin-bottom: 4px; }

/* 对照表 */
.tbl { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14.5px; }
.tbl th { text-align: left; padding: 10px 14px; background: #f5f6fa; color: var(--ink-2); font-weight: 600; border-bottom: 2px solid var(--line); }
.tbl td { padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; color: #2b3040; }
.tbl tr:hover td { background: #fafbfd; }
.tbl .yes { color: var(--green); font-weight: 600; }
.tbl .no { color: var(--red); font-weight: 600; }

/* 三层框架卡 */
.layer-card { display: flex; gap: 16px; align-items: flex-start; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; margin: 12px 0; }
.layer-card .n { flex-shrink: 0; width: 34px; height: 34px; border-radius: 9px; background: var(--brand-soft); color: var(--brand); font-weight: 700; display: flex; align-items: center; justify-content: center; }
.layer-card h4 { margin: 0 0 4px; font-size: 16px; }
.layer-card p { margin: 0; font-size: 14px; color: var(--ink-2); }

/* 占位区块 */
.todo-block {
  border: 1px dashed var(--line); border-radius: 12px; padding: 22px;
  color: var(--ink-3); font-size: 14px; background: #fcfcfe; margin: 16px 0;
}
.todo-block .label { color: var(--brand); font-weight: 600; }

/* 页脚 */
footer { border-top: 1px solid var(--line); padding: 32px 0; font-size: 13.5px; color: var(--ink-3); }
footer .wrap { display: flex; gap: 16px; flex-wrap: wrap; align-items: center; }
footer a { color: var(--ink-2); }

/* 来源列表 */
.sources { font-size: 13.5px; color: var(--ink-2); }
.sources li { margin: 5px 0; word-break: break-all; }

@media (max-width: 640px) {
  .hero h1 { font-size: 32px; }
  .article h1 { font-size: 28px; }
  .topbar nav { gap: 14px; }
}