/* 布局与组件 */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-sans);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--primary);color:var(--primary-ink);padding:.5rem 1rem;border-radius:0 0 var(--radius-s) 0;z-index:100}
.skip-link:focus{left:0}
/* header */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{max-width:1180px;margin:0 auto;padding:.6rem 1.25rem;display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.55rem;font-weight:700;color:var(--ink);font-size:1.05rem}
.brand:hover{text-decoration:none}
.brand-mark{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--m1),var(--m3));color:#fff;font-family:var(--font-mono);font-size:.8rem;letter-spacing:.5px}
.main-nav{display:flex;gap:.25rem}
.main-nav a{padding:.35rem .75rem;border-radius:999px;color:var(--ink-soft);font-size:.95rem}
.main-nav a:hover{background:var(--surface-2);color:var(--ink);text-decoration:none}
.main-nav a[aria-current="page"]{background:var(--primary-soft);color:var(--primary);font-weight:600}
.header-tools{margin-left:auto;display:flex;align-items:center;gap:.6rem}
.searchbox{position:relative}
#search-input{width:230px;max-width:52vw;padding:.45rem .8rem;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink);font-size:.9rem}
#search-input:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 3px var(--primary-soft)}
.search-results{position:absolute;right:0;top:calc(100% + 6px);width:min(430px,88vw);max-height:60vh;overflow:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:.35rem;z-index:60}
.search-item{display:block;padding:.5rem .65rem;border-radius:var(--radius-s);color:var(--ink)}
.search-item:hover,.search-item.active{background:var(--surface-2);text-decoration:none}
.search-item .si-title{display:block;font-weight:600;font-size:.95rem}
.search-item .si-meta{display:block;font-size:.78rem;color:var(--ink-soft);font-family:var(--font-mono)}
.search-empty{padding:.6rem;color:var(--ink-soft);font-size:.9rem}
.theme-toggle{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:var(--surface);cursor:pointer;display:grid;place-items:center;color:var(--ink)}
.theme-toggle:hover{border-color:var(--primary)}
.theme-ico::before{content:"◐";font-size:1.05rem}
[data-theme="dark"] .theme-ico::before{content:"◑"}
/* main */
.site-main{max-width:1180px;margin:0 auto;padding:1.5rem 1.25rem 4rem}
.page-head{padding:1.2rem 0 .4rem}
.page-head h1{margin:0 0 .4rem;font-size:2rem;letter-spacing:.5px}
.page-desc{margin:0;color:var(--ink-soft);max-width:62ch}
.sec-title{font-size:1.3rem;margin:2.4rem 0 1rem;display:flex;align-items:center;gap:.6rem;flex-wrap:wrap}
/* hero */
.hero{margin:-1.5rem -1.25rem 0;background:
  linear-gradient(var(--grid) 1px,transparent 1px),
  linear-gradient(90deg,var(--grid) 1px,transparent 1px),
  radial-gradient(1000px 420px at 15% -10%,var(--primary-soft),transparent 65%);
  background-size:34px 34px,34px 34px,auto;
  border-bottom:1px solid var(--line);padding:3.4rem 1.25rem 2.4rem}
.hero-inner{max-width:1180px;margin:0 auto}
.eyebrow{margin:0 0 .6rem;color:var(--primary);font-weight:600;font-size:.85rem;letter-spacing:.14em}
.hero h1{margin:0;font-size:3rem;line-height:1.15;letter-spacing:.02em}
.tagline{max-width:64ch;color:var(--ink-soft);font-size:1.06rem;margin:1rem 0 1.4rem}
.hero-actions{display:flex;gap:.7rem;flex-wrap:wrap;margin-bottom:1.6rem}
.btn{display:inline-block;padding:.6rem 1.3rem;border-radius:999px;font-weight:600;font-size:.98rem;border:1px solid transparent;cursor:pointer}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--primary);color:var(--primary-ink);box-shadow:var(--shadow-s)}
.btn-ghost{border-color:var(--line-strong);color:var(--ink);background:var(--surface)}
.stats{display:flex;gap:.8rem;flex-wrap:wrap;margin-bottom:1.6rem}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:.7rem 1.1rem;min-width:118px;box-shadow:var(--shadow-s)}
.stat-n{display:block;font-family:var(--font-mono);font-size:1.35rem;font-weight:700}
.stat-label{color:var(--ink-soft);font-size:.82rem}
/* progress */
.progress-widget{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:.9rem 1.1rem;max-width:640px;box-shadow:var(--shadow-s)}
.progress-head{display:flex;justify-content:space-between;font-size:.92rem;font-weight:600;margin-bottom:.45rem}
.progress-num{font-family:var(--font-mono);color:var(--primary)}
.progress-bar{height:10px;border-radius:999px;background:var(--surface-2);overflow:hidden}
.progress-bar.slim{height:6px}
.progress-fill{height:100%;width:0;border-radius:999px;background:linear-gradient(90deg,var(--m1),var(--accent));transition:width var(--motion)}
.progress-foot{display:flex;justify-content:space-between;align-items:center;margin-top:.5rem;font-size:.82rem;color:var(--ink-soft);gap:.6rem;flex-wrap:wrap}
.progress-actions{display:flex;gap:.9rem}
.btn-link{background:none;border:none;color:var(--primary);cursor:pointer;font-size:.82rem;padding:0}
.btn-link.danger{color:var(--bad)}
.btn-link:hover{text-decoration:underline}
/* modules */
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:1rem}
.module-card{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--m1);border-radius:var(--radius);padding:1.1rem 1.2rem;box-shadow:var(--shadow-s)}
.module-card.m2{border-left-color:var(--m2)}.module-card.m3{border-left-color:var(--m3)}
.module-card.m4{border-left-color:var(--m4)}.module-card.m5{border-left-color:var(--m5)}
.module-card.m6{border-left-color:var(--m6)}.module-card.m7{border-left-color:var(--m7)}
.module-card header{display:flex;justify-content:space-between;align-items:baseline;gap:.6rem;flex-wrap:wrap}
.module-card h3{margin:0;font-size:1.08rem}
.module-count{font-size:.78rem;color:var(--ink-soft);font-family:var(--font-mono)}
.module-desc{color:var(--ink-soft);font-size:.9rem;margin:.35rem 0 .8rem}
.module-kps{display:flex;flex-direction:column;gap:.25rem;margin-bottom:.7rem}
.kp-row{display:flex;align-items:center;gap:.55rem;padding:.4rem .5rem;border-radius:var(--radius-s);color:var(--ink);font-size:.92rem}
.kp-row:hover{background:var(--surface-2);text-decoration:none}
.kp-row .dot{width:8px;height:8px;border-radius:50%;background:var(--line-strong);flex:none;transition:background var(--motion)}
.kp-row[data-state="learning"] .dot{background:var(--warn)}
.kp-row[data-state="mastered"] .dot{background:var(--good)}
.kp-row-id{font-family:var(--font-mono);font-size:.76rem;color:var(--ink-soft);flex:none}
.kp-row-title{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.kp-row-meta{display:flex;gap:.35rem;flex:none}
.module-progress{margin-top:.3rem}
/* chips */
.chip{display:inline-block;font-size:.74rem;padding:.08rem .55rem;border-radius:999px;border:1px solid var(--line);color:var(--ink-soft);background:var(--surface)}
.chip.lvl-intro{color:var(--lvl-intro);border-color:currentColor}
.chip.lvl-core{color:var(--lvl-core);border-color:currentColor}
.chip.lvl-adv{color:var(--lvl-adv);border-color:currentColor}
.chip.lvl-frontier{color:var(--lvl-frontier);border-color:currentColor}
.chip-id{font-family:var(--font-mono)}
.chip-status[data-state="learning"]{color:var(--warn);border-color:currentColor}
.chip-status[data-state="mastered"]{color:var(--good);border-color:currentColor}
/* minpath */
.minpath{margin:1rem 0 1.5rem}
.minpath-list{list-style:none;margin:1rem 0 0;padding:0;display:flex;flex-direction:column;gap:.5rem;counter-reset:step}
.minpath-step{display:flex;align-items:center;gap:.9rem;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:.7rem 1rem;box-shadow:var(--shadow-s)}
.minpath-step[data-state="mastered"]{border-color:var(--good)}
.step-no{width:30px;height:30px;border-radius:50%;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center;font-family:var(--font-mono);font-size:.85rem;font-weight:700;flex:none}
.step-main{flex:1;min-width:0}
.step-title{font-weight:600;color:var(--ink)}
.step-meta{display:flex;gap:.45rem;align-items:center;margin-top:.15rem;font-size:.78rem;color:var(--ink-soft)}
.step-toggle{border:1px solid var(--line-strong);background:var(--surface);color:var(--ink);border-radius:999px;padding:.3rem .85rem;font-size:.8rem;cursor:pointer;flex:none}
.minpath-step[data-state="mastered"] .step-toggle{background:var(--good);border-color:var(--good);color:#fff}
.phase{margin:1.4rem 0}
.kp-list{display:flex;flex-direction:column;gap:.3rem;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:.6rem;box-shadow:var(--shadow-s)}
/* prose */
.prose-section{margin-top:2.6rem}
.prose{max-width:820px}
.prose h1{font-size:1.7rem}
.prose h2{font-size:1.28rem;margin:2rem 0 .7rem;padding-left:.65rem;border-left:4px solid var(--primary);line-height:1.5}
.prose h3{font-size:1.08rem;margin:1.4rem 0 .5rem}
.prose p{margin:.7rem 0}
.prose ul,.prose ol{margin:.6rem 0;padding-left:1.4rem}
.prose li{margin:.3rem 0}
.prose blockquote{margin:1rem 0;padding:.6rem 1rem;border-left:4px solid var(--accent);background:var(--surface);border-radius:0 var(--radius-s) var(--radius-s) 0;color:var(--ink-soft)}
.prose hr{border:none;border-top:1px dashed var(--line-strong);margin:1.6rem 0}
.icode{font-family:var(--font-mono);font-size:.86em;background:var(--surface-2);border:1px solid var(--line);border-radius:5px;padding:.05em .35em;word-break:break-all}
.tablewrap{overflow-x:auto;margin:1rem 0;border:1px solid var(--line);border-radius:var(--radius-s)}
.prose table{border-collapse:collapse;width:100%;font-size:.92rem}
.prose th,.prose td{padding:.5rem .8rem;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.prose th{background:var(--surface-2);font-weight:600;white-space:nowrap}
.prose tr:last-child td{border-bottom:none}
.frac{display:inline-flex;flex-direction:column;vertical-align:-0.55em;text-align:center;font-size:.82em;line-height:1.2;margin:0 .18em;font-family:var(--font-mono)}
.frac>.fn{border-bottom:1.5px solid currentColor;padding:0 .3em}
.frac>.fd{padding:0 .3em}
/* code */
.codeblock{margin:1rem 0;background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius-s);overflow:hidden}
.codeblock figcaption{font-family:var(--font-mono);font-size:.72rem;color:var(--ink-soft);padding:.4rem .9rem;border-bottom:1px solid var(--line);letter-spacing:.06em;text-transform:uppercase}
.codeblock pre{margin:0;padding:.9rem 1rem;overflow-x:auto}
.codeblock code{font-family:var(--font-mono);font-size:.85rem;line-height:1.65;color:var(--ink)}
.tok-c{color:var(--ink-soft);font-style:italic}
.tok-s{color:var(--good)}
.tok-n{color:var(--lvl-frontier)}
.tok-k{color:var(--primary);font-weight:600}
[data-theme="dark"] .tok-s{color:var(--good)}
/* kp page */
.breadcrumb{display:flex;align-items:center;gap:.5rem;font-size:.85rem;color:var(--ink-soft);margin:.4rem 0 1rem;flex-wrap:wrap}
.breadcrumb a{color:var(--ink-soft)}
.breadcrumb a:hover{color:var(--primary)}
.crumb-sep{opacity:.6}
.kp{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-l);padding:1.8rem 2rem;box-shadow:var(--shadow-s)}
.kp-head{border-bottom:1px solid var(--line);padding-bottom:1rem;margin-bottom:1.2rem}
.kp-module-tag{display:inline-block;margin:0 0 .5rem;font-size:.8rem;font-weight:700;color:var(--mod,var(--m1));letter-spacing:.08em}
.kp-head h1{margin:0 0 .7rem;font-size:1.75rem;line-height:1.3}
.kp-meta{display:flex;gap:.5rem;align-items:center;flex-wrap:wrap}
.kp-rel{margin:1.2rem 0;background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius);padding:.9rem 1.1rem}
.rel-title{margin:0 0 .6rem;font-size:.88rem;color:var(--ink-soft);letter-spacing:.06em}
.rel-list{display:flex;flex-direction:column;gap:.2rem}
.progress-ctl{margin:1.6rem 0 0;display:flex;align-items:center;gap:.4rem;flex-wrap:wrap}
.ctl-label{font-size:.9rem;color:var(--ink-soft)}
.progress-ctl button{border:1px solid var(--line-strong);background:var(--surface);color:var(--ink);padding:.4rem 1rem;border-radius:999px;font-size:.88rem;cursor:pointer}
.progress-ctl button:hover{border-color:var(--primary);color:var(--primary)}
.progress-ctl button.active[data-state="learning"]{background:var(--warn);border-color:var(--warn);color:#fff}
.progress-ctl button.active[data-state="mastered"]{background:var(--good);border-color:var(--good);color:#fff}
.progress-ctl button.active[data-state="none"]{background:var(--line-strong);color:var(--ink)}
.pn{display:flex;justify-content:space-between;gap:1rem;margin-top:1.6rem}
.pn-item{flex:1;display:flex;flex-direction:column;gap:.15rem;border:1px solid var(--line);border-radius:var(--radius);padding:.8rem 1rem;color:var(--ink);background:var(--surface-2)}
.pn-item:hover{text-decoration:none;border-color:var(--primary)}
.pn-next{text-align:right;align-items:flex-end}
.pn-dir{font-size:.75rem;color:var(--ink-soft)}
.pn-title{font-weight:600;font-size:.95rem}
.pn-item.is-empty{visibility:hidden}
/* map */
.map-section{margin-top:1rem}
.map-legend{display:flex;gap:1rem;flex-wrap:wrap;align-items:center;margin-bottom:.9rem;font-size:.85rem;color:var(--ink-soft)}
.legend-title{font-weight:600}
.legend-item{display:inline-flex;align-items:center;gap:.4rem}
.swatch{width:12px;height:12px;border-radius:4px;display:inline-block}
.map-scroll{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1rem;overflow:auto;max-height:72vh;box-shadow:var(--shadow-s)}
.depmap{display:block;min-width:640px}
.map-colhead{fill:var(--ink-soft);font-size:14px;font-weight:700;letter-spacing:.1em}
.depmap .edge{fill:none;stroke:var(--line-strong);stroke-width:1.4;opacity:.5;transition:opacity var(--motion),stroke var(--motion)}
.depmap .edge.hl{stroke:var(--accent);opacity:1;stroke-width:2.2}
.depmap.has-focus .edge:not(.hl){opacity:.07}
.depmap .mnode{cursor:pointer}
.depmap .mnode rect{fill:var(--surface);stroke-width:1.8;transition:opacity var(--motion),stroke var(--motion)}
.depmap .mnode .n-id{font-family:var(--font-mono);font-size:10.5px;fill:var(--ink-soft)}
.depmap .mnode .n-title{font-size:12.5px;fill:var(--ink);font-weight:600}
.depmap .mnode:hover rect,.depmap .mnode:focus rect{stroke-width:3;filter:drop-shadow(0 3px 6px rgba(0,0,0,.18))}
.depmap.has-focus .mnode.dim{opacity:.3}
.depmap.has-focus .mnode.dim rect{stroke-width:1.2}
.map-hint{color:var(--ink-soft);font-size:.83rem;margin:.6rem 0 0}
/* glossary */
.glossary-tools{display:flex;align-items:center;gap:.8rem;margin:.6rem 0 1rem;flex-wrap:wrap}
#glossary-filter{width:min(340px,80vw);padding:.5rem .9rem;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink);font-size:.92rem}
#glossary-filter:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 3px var(--primary-soft)}
.glossary-count{font-size:.82rem;color:var(--ink-soft);font-family:var(--font-mono)}
.glossary tr.hide-row{display:none}
.refs{padding-top:.5rem;border-top:1px dashed var(--line-strong);margin-top:2.4rem}
/* footer */
.site-footer{border-top:1px solid var(--line);background:var(--surface)}
.footer-inner{max-width:1180px;margin:0 auto;padding:1.2rem 1.25rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;color:var(--ink-soft);font-size:.84rem}
.missing{color:var(--bad);font-family:var(--font-mono)}
/* responsive */
@media (max-width:880px){
  .hero h1{font-size:2.3rem}
  .kp{padding:1.3rem 1.1rem}
  .header-inner{gap:.6rem}
  .searchbox{order:3;width:100%}
  #search-input{width:100%;max-width:none}
  .search-results{left:0;right:auto;width:100%}
}
@media (max-width:560px){
  .main-nav a{padding:.3rem .5rem;font-size:.88rem}
  .hero{padding:2.4rem 1.25rem 1.8rem}
  .hero h1{font-size:1.9rem}
  .stat{min-width:96px}
  .minpath-step{flex-wrap:wrap}
  .pn{flex-direction:column}
  .pn-next{align-items:flex-start;text-align:left}
}