/* style.css — 版式与组件（读取 tokens.css 的变量） */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-ui);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.75;
  font-size: 16px;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; border-radius: 4px; }
.skip {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--c-surface); color: var(--c-text); padding: 8px 14px; border-radius: 0 0 var(--radius-s) 0;
}
.skip:focus { left: 0; }

/* ---------- 头部 ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--c-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
}
.head-in {
  max-width: var(--maxw); margin: 0 auto; padding: 10px 20px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 8px; color: var(--c-text); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--c-primary); font-size: 20px; }
.brand-name { font-size: 17px; letter-spacing: 0.5px; }
.nav { display: flex; gap: 4px; }
.nav-link {
  padding: 6px 12px; border-radius: var(--radius-s); color: var(--c-text-soft); font-size: 14.5px;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.nav-link:hover { background: var(--c-surface2); text-decoration: none; color: var(--c-text); }
.nav-link.active { background: var(--c-surface2); color: var(--c-primary); font-weight: 600; }
.search { position: relative; margin-left: auto; }
.search input {
  width: 230px; padding: 7px 12px; border-radius: var(--radius-s);
  border: 1px solid var(--c-border); background: var(--c-surface); color: var(--c-text);
  font-size: 14px; font-family: inherit;
}
.search input:focus { border-color: var(--c-primary); }
.search-panel {
  position: absolute; right: 0; top: calc(100% + 6px); width: 340px; max-height: 420px; overflow: auto;
  background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-m);
  box-shadow: var(--shadow-2); padding: 6px; z-index: 60;
}
.search-panel .hit { display: block; padding: 8px 10px; border-radius: var(--radius-s); color: var(--c-text); }
.search-panel .hit:hover { background: var(--c-surface2); text-decoration: none; }
.hit-title { display: block; font-size: 14.5px; font-weight: 600; }
.hit-meta { display: block; font-size: 12.5px; color: var(--c-text-soft); }
.hit-empty { padding: 10px; color: var(--c-text-soft); font-size: 14px; }
.theme-btn {
  border: 1px solid var(--c-border); background: var(--c-surface); color: var(--c-text);
  width: 36px; height: 36px; border-radius: 50%; cursor: pointer; font-size: 15px;
  transition: transform var(--t-fast) var(--ease);
}
.theme-btn:hover { transform: rotate(20deg); }

/* ---------- 首页 ---------- */
.hero { background: var(--c-surface); border-bottom: 1px solid var(--c-border); }
.hero-in { display: flex; align-items: center; gap: 30px; padding: 52px 20px; }
.hero-text { flex: 1.2; min-width: 260px; }
.kicker { color: var(--c-accent); font-weight: 700; letter-spacing: 2px; font-size: 13px; margin: 0 0 6px; }
.hero h1 { font-size: 40px; margin: 0 0 12px; letter-spacing: 1px; }
.tagline { color: var(--c-text-soft); font-size: 17px; margin: 0 0 18px; max-width: 480px; }
.hero-stats { display: flex; gap: 22px; margin-bottom: 20px; }
.stat { color: var(--c-text-soft); font-size: 14px; }
.stat strong { display: block; font-size: 26px; color: var(--c-text); }
.hero-cta { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 9px 18px; border-radius: var(--radius-m);
  border: 1px solid var(--c-border); color: var(--c-text); background: var(--c-surface);
  font-size: 15px; cursor: pointer; font-family: inherit;
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.btn:hover { text-decoration: none; box-shadow: var(--shadow-1); transform: translateY(-1px); }
.btn-primary { background: var(--c-primary); border-color: var(--c-primary); color: #fff; font-weight: 600; }
[data-theme="dark"] .btn-primary { color: #0d1120; }
.btn-sm { padding: 5px 12px; font-size: 13px; }
.btn.danger { color: #c92a2a; }
[data-theme="dark"] .btn.danger { color: #ff8787; }
.search-hint { color: var(--c-text-soft); font-size: 13px; margin-top: 14px; }
.hero-svg { flex: 1; min-width: 240px; max-width: 460px; }
.hero-svg .hl-edges path { stroke: var(--edge); stroke-width: 1.5; fill: none; }
.hero-svg .hl-nodes circle { fill: var(--lvbg); stroke: var(--lvfg); stroke-width: 1.6; }
.hero-svg .hl-nodes text { fill: var(--c-text); font-size: 11px; text-anchor: middle; font-weight: 600; }
.intro-sec { padding-top: 36px; }
.intro-sec h2, .progress-sec h2, .modules-sec h2 { font-size: 22px; }
.more { font-weight: 600; }

/* 进度 */
.progress-sec { padding: 30px 20px 6px; }
.progress-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.progress-actions { display: flex; gap: 8px; }
.overall { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.bar { flex: 1; min-width: 180px; height: 10px; border-radius: 6px; background: var(--c-surface2); overflow: hidden; }
.bar-fill { height: 100%; width: 0; border-radius: 6px; background: linear-gradient(90deg, var(--c-primary), var(--c-accent)); transition: width var(--t-med) var(--ease); }
.overall-pct { font-weight: 700; font-size: 18px; min-width: 52px; }
.overall-text { color: var(--c-text-soft); font-size: 14px; }
.progress-note { color: var(--c-text-soft); font-size: 13px; }

/* 模块卡片 */
.modules-sec { padding: 18px 20px 60px; }
.module-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.module-card {
  background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-l);
  padding: 18px 20px; box-shadow: var(--shadow-1);
}
.module-card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.module-card h2 { font-size: 17px; margin: 0; border-left: 3px solid var(--mod-accent, var(--c-primary)); padding-left: 10px; }
.module-card-stats { color: var(--c-text-soft); font-size: 13px; }
.module-bar { height: 6px; border-radius: 4px; background: var(--c-surface2); margin: 12px 0 6px; overflow: hidden; }
.module-bar-fill { height: 100%; width: 0; background: var(--mod-accent, var(--c-primary)); border-radius: 4px; transition: width var(--t-med) var(--ease); }
.kp-list { list-style: none; margin: 8px 0 0; padding: 0; }
.kp-list li { display: flex; align-items: center; gap: 8px; padding: 6px 0; border-bottom: 1px dashed var(--c-border); flex-wrap: wrap; }
.kp-list li:last-child { border-bottom: none; }
.kp-link { flex: 1; min-width: 160px; font-size: 14.5px; }
.kp-meta { color: var(--c-text-soft); font-size: 12.5px; }

/* 徽章 */
.lvchip {
  display: inline-block; padding: 1px 9px; border-radius: 999px;
  background: var(--lvbg); color: var(--lvfg); font-size: 12px; font-weight: 600; white-space: nowrap;
}
.modchip {
  display: inline-block; padding: 2px 10px; border-radius: 999px; color: #fff;
  background: var(--mod-accent, var(--c-primary)); font-size: 12.5px; font-weight: 600;
}
[data-theme="dark"] .modchip { color: #0d1120; }
.minchip { color: var(--c-text-soft); font-size: 13px; }
.tagrow { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.tagchip { background: var(--c-surface2); color: var(--c-text-soft); border-radius: 999px; padding: 1px 9px; font-size: 12px; }
.dot {
  width: 12px; height: 12px; border-radius: 50%; border: 2px solid var(--c-border);
  background: transparent; cursor: pointer; flex: none; padding: 0;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.dot:hover { transform: scale(1.2); }
.dot[data-state="learning"] { background: var(--lv-c-bg); border-color: var(--lv-c-fg); }
.dot[data-state="done"] { background: var(--c-accent); border-color: var(--c-accent); }

/* ---------- 页头（子页面） ---------- */
.page-head { padding: 40px 0 8px; }
.page-head h1 { font-size: 30px; margin: 0 0 6px; }
.page-sub { color: var(--c-text-soft); margin: 0; }
.path-overall { margin: 18px 0 8px; }
.path-sec { margin: 22px 0 8px; }
.path-list { list-style: none; margin: 14px 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.path-item {
  display: flex; align-items: center; gap: 14px; background: var(--c-surface);
  border: 1px solid var(--c-border); border-radius: var(--radius-m); padding: 12px 16px; flex-wrap: wrap;
}
.path-num {
  flex: none; width: 30px; height: 30px; border-radius: 50%; background: var(--c-surface2);
  color: var(--c-text); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 14px;
}
.path-main { flex: 1; min-width: 220px; }
.path-main .kp-link { font-weight: 600; }
.path-reason { margin: 2px 0 0; color: var(--c-text-soft); font-size: 13.5px; }
.path-min { color: var(--c-text-soft); font-size: 12.5px; }
.path-doc { margin-top: 34px; }
.state-btns { display: inline-flex; gap: 0; border: 1px solid var(--c-border); border-radius: var(--radius-s); overflow: hidden; }
.state-btns button {
  border: none; background: var(--c-surface); color: var(--c-text-soft); padding: 5px 11px;
  font-size: 12.5px; cursor: pointer; font-family: inherit;
  border-right: 1px solid var(--c-border);
}
.state-btns button:last-child { border-right: none; }
.state-btns button[aria-pressed="true"] { background: var(--lvfg); color: var(--lvbg); font-weight: 600; }
.state-btns button:hover { background: var(--c-surface2); }
.state-btns button[aria-pressed="true"]:hover { background: var(--lvfg); opacity: 0.9; }

/* ---------- 知识地图 ---------- */
.map-legend { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin: 10px 0; }
.legend-note { color: var(--c-text-soft); font-size: 13px; margin-left: 8px; }
.map-wrap { overflow-x: auto; border: 1px solid var(--c-border); border-radius: var(--radius-l); background: var(--c-surface); padding: 8px; }
.map-svg { min-width: 900px; width: 100%; height: auto; display: block; }
.map-svg .col-head { fill: var(--c-text-soft); font-size: 14px; font-weight: 700; }
.map-svg .edge { fill: none; stroke: var(--edge); stroke-width: 1.4; opacity: 0.75; }
.map-svg .node circle { fill: var(--lvbg); stroke: var(--lvfg); stroke-width: 1.6; transition: transform var(--t-fast) var(--ease); }
.map-svg .node a:hover circle { filter: brightness(0.95); }
.map-svg .nid { fill: var(--lvfg); font-size: 10.5px; font-weight: 700; font-family: var(--font-mono); }
.map-svg .nlabel { fill: var(--c-text); font-size: 12px; }

/* ---------- 知识点详情 ---------- */
.kp-page { padding-bottom: 50px; }
.crumb { padding: 26px 0 4px; color: var(--c-text-soft); font-size: 13.5px; }
.kp-head h1 { font-size: 30px; margin: 6px 0 12px; line-height: 1.4; }
.kp-meta-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.kp-progress-wrap { display: flex; align-items: center; gap: 10px; margin: 6px 0 4px; }
.kp-progress-label { color: var(--c-text-soft); font-size: 13.5px; }
.kp-body { margin-top: 18px; background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-l); padding: 26px 30px 30px; box-shadow: var(--shadow-1); }
.kp-body h2 {
  font-size: 19px; margin: 30px 0 10px; padding-left: 12px;
  border-left: 4px solid var(--mod-accent, var(--c-primary)); line-height: 1.4;
}
.kp-body h2:first-child { margin-top: 4px; }
.kp-body h3 { font-size: 16px; margin: 20px 0 8px; }
.kp-body p { margin: 8px 0; }
.kp-body ul, .kp-body ol { margin: 8px 0; padding-left: 24px; }
.kp-body li { margin: 5px 0; }
.kp-body blockquote {
  margin: 12px 0; padding: 10px 16px; border-left: 4px solid var(--c-accent);
  background: var(--c-surface2); border-radius: 0 var(--radius-s) var(--radius-s) 0; color: var(--c-text-soft);
}
.ic { background: var(--c-code-bg); border-radius: 4px; padding: 1px 6px; font-family: var(--font-mono); font-size: 0.88em; }
pre.code {
  background: var(--c-pre-bg); color: var(--c-pre-text); border-radius: var(--radius-m);
  padding: 14px 18px; overflow-x: auto; font-size: 13.5px; line-height: 1.65;
  font-family: var(--font-mono); margin: 12px 0; border: 1px solid var(--c-border);
}
pre.code code { background: none; padding: 0; font-family: inherit; }
.tk-kw { color: #82aaff; font-weight: 600; }
.tk-str { color: #c3e88d; }
.tk-num { color: #f78c6c; }
.tk-com { color: #7f8ab3; font-style: italic; }
[data-theme="dark"] .tk-kw { color: #a5b8ff; }
.formula {
  margin: 14px 0; padding: 14px 20px; text-align: center; line-height: 2;
  background: var(--c-surface2); border-radius: var(--radius-m);
  font-family: var(--font-mono); font-size: 15px; overflow-x: auto;
}
.frac { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; margin: 0 3px; }
.frac > span:first-child { border-bottom: 1.5px solid currentColor; padding: 0 5px; line-height: 1.3; }
.frac > span:last-child { padding: 0 5px; line-height: 1.3; }
.tbl { overflow-x: auto; margin: 12px 0; }
.tbl table { border-collapse: collapse; width: 100%; font-size: 14px; }
.tbl th, .tbl td { border: 1px solid var(--c-border); padding: 7px 12px; text-align: left; }
.tbl th { background: var(--c-surface2); }
.tbl tbody tr:nth-child(even) { background: color-mix(in srgb, var(--c-surface2) 45%, transparent); }
.kp-refs { margin-top: 22px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.ref-sec { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-m); padding: 14px 18px; }
.ref-sec h2 { font-size: 16px; margin: 0 0 8px; }
.ref-list { list-style: none; margin: 0; padding: 0; }
.ref-list li { padding: 5px 0; border-bottom: 1px dashed var(--c-border); display: flex; align-items: center; gap: 8px; justify-content: space-between; flex-wrap: wrap; }
.ref-list li:last-child { border-bottom: none; }
.ref-empty { color: var(--c-text-soft); font-size: 13.5px; margin: 0; }
.pn-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 26px; }
.pn { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-m); padding: 12px 16px; }
.pn.next { text-align: right; }
.pn-label { display: block; color: var(--c-text-soft); font-size: 12.5px; margin-bottom: 3px; }
.pn a { font-weight: 600; font-size: 14.5px; }

/* ---------- 页脚 ---------- */
.site-foot { border-top: 1px solid var(--c-border); margin-top: 40px; padding: 22px 0 30px; color: var(--c-text-soft); font-size: 13px; }
.site-foot p { margin: 4px 0; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .module-grid { grid-template-columns: 1fr; }
  .kp-refs { grid-template-columns: 1fr; }
  .hero-in { flex-direction: column; align-items: flex-start; }
  .hero-svg { max-width: 100%; }
}
@media (max-width: 640px) {
  .hero h1 { font-size: 30px; }
  .search input { width: 150px; }
  .search-panel { width: 280px; }
  .kp-body { padding: 18px 16px 22px; }
  .pn-nav { grid-template-columns: 1fr; }
  .head-in { gap: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}