:root{
  --bg:#05070d; --bg2:#080d18; --card:#0d1424; --card2:#111a2e;
  --line:#1b263d; --line2:#27364f;
  --ink:#e7eefb; --ink2:#9aa9c6; --ink3:#66748f;
  --gold:#e8b95c; --blue:#7c9cff; --green:#3fd6a4;
  --r:13px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%}
body{
  background:radial-gradient(1100px 700px at 75% -12%,#0f1c33 0%,var(--bg) 55%) fixed;
  color:var(--ink);display:flex;flex-direction:column;overflow:hidden;
  font:400 14px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans SC",system-ui,sans-serif;
}
h1,h2,h3,p{margin:0}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}

/* ── HUD ── */
.hud{
  display:flex;align-items:center;gap:14px;padding:8px 14px;z-index:30;
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(8,13,24,.96),rgba(8,13,24,.82));
  backdrop-filter:blur(14px);flex-wrap:wrap;
}
.logo{display:flex;align-items:center;gap:10px;min-width:0}
.orb{
  width:12px;height:12px;border-radius:50%;flex:none;
  background:radial-gradient(circle at 35% 35%,#fff2cf,var(--gold) 55%,#a97c2a);
  box-shadow:0 0 14px rgba(232,185,92,.65),0 0 0 3px rgba(232,185,92,.08);
}
.lt h1{font-size:14.5px;font-weight:680;letter-spacing:.02em;white-space:nowrap}
.lt p{font-size:10px;color:var(--ink3);letter-spacing:.08em;white-space:nowrap}
.tabs{display:flex;gap:2px;background:#0a1120;border:1px solid var(--line);border-radius:10px;padding:2px}
.tabs button{padding:5px 13px;border-radius:8px;font-size:12.5px;color:var(--ink2);transition:.16s;white-space:nowrap}
.tabs button.on{background:#18233c;color:#fff;box-shadow:inset 0 0 0 1px #2b3d5e}

.stats{display:flex;flex-direction:column;gap:3px;min-width:150px}
.lvl{display:flex;align-items:baseline;gap:6px;font-size:10.5px;color:var(--ink3)}
.lvl b{font-size:12px;color:var(--gold);letter-spacing:.04em}
.xpbar{height:3px;border-radius:99px;background:#131c2e;overflow:hidden}
.xpbar i{display:block;height:100%;width:0;border-radius:99px;
  background:linear-gradient(90deg,#7c9cff,#e8b95c);transition:width .4s}
.meta{display:flex;gap:5px;font-size:10px;color:#5f6d88;font-variant-numeric:tabular-nums}

.tools{display:flex;align-items:center;gap:6px;margin-left:auto}
.search{
  display:flex;align-items:center;gap:6px;padding:6px 9px;min-width:190px;
  background:#0a1220;border:1px solid var(--line);border-radius:9px;color:var(--ink3);
}
.search:focus-within{border-color:#38527c;color:var(--ink2)}
.search input{border:0;outline:0;background:none;color:var(--ink);font-size:12.5px;width:100%}
.search input::placeholder{color:#55637f}
.search em{font-style:normal;font-size:10px;color:var(--ink3);white-space:nowrap}
.icon{
  width:31px;height:31px;border-radius:9px;border:1px solid var(--line);
  background:#0a1220;font-size:14px;line-height:1;display:grid;place-items:center;
  color:var(--ink2);transition:.15s;
}
.icon:hover{border-color:#38527c;color:#fff;background:#121c31}

/* ── 视图 ── */
main{position:relative;flex:1;min-height:0}
.view{position:absolute;inset:0;display:none;overflow:auto;overscroll-behavior:contain}
.view.on{display:block}
#v-explore.on{overflow:hidden}
#cv{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;cursor:grab}
#cv:active{cursor:grabbing}

.chips{position:absolute;left:12px;bottom:12px;right:170px;display:flex;gap:6px;flex-wrap:wrap;pointer-events:none;z-index:5}
.chip{
  pointer-events:auto;display:inline-flex;align-items:center;gap:6px;padding:4px 10px;
  border-radius:999px;font-size:11.5px;color:var(--ink2);
  background:rgba(11,17,30,.86);border:1px solid var(--line2);backdrop-filter:blur(6px);transition:.15s;
}
.chip i{width:7px;height:7px;border-radius:50%;display:block}
.chip:hover{border-color:#3b5580;color:#fff}
.chip.off{opacity:.32;filter:grayscale(.8)}
.chip b{font-size:9.5px;color:var(--ink3);font-weight:500}

.hint{
  position:absolute;left:14px;top:12px;font-size:11px;color:#5b6a86;z-index:5;pointer-events:none;
  background:rgba(8,13,23,.7);border:1px solid #16203a;padding:4px 9px;border-radius:7px;
}
#mini{
  position:absolute;right:14px;bottom:14px;width:150px;height:105px;z-index:6;
  border:1px solid var(--line2);border-radius:10px;background:rgba(8,13,23,.78);
  backdrop-filter:blur(6px);cursor:crosshair;
}
.minilabel{position:absolute;right:20px;bottom:122px;font-size:9px;letter-spacing:.16em;color:#4b5973;z-index:6}

/* ── 学习 ── */
.wrap{max-width:820px;margin:0 auto;padding:24px 16px 70px}
.lead{
  border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(160deg,#0e1729,#0b1322);
  padding:18px;margin-bottom:16px;
}
.lead h2{font-size:17px;font-weight:660;margin-bottom:6px}
.lead p{font-size:12.5px;color:var(--ink2);line-height:1.7}
.bigbar{height:5px;border-radius:99px;background:#131c2e;overflow:hidden;margin:14px 0 9px}
.bigbar i{display:block;height:100%;width:0;border-radius:99px;background:linear-gradient(90deg,#7c9cff,#e8b95c);transition:width .4s}
.bigmeta{display:flex;align-items:center;gap:12px;font-size:11.5px;color:var(--ink3)}
.cta{
  margin-left:auto;font-size:12px;color:#0a1220;font-weight:600;padding:6px 13px;border-radius:8px;
  background:linear-gradient(180deg,#f0cd85,#dda947);transition:.16s;
}
.cta:hover{filter:brightness(1.07)}
.cta:disabled{opacity:.35;filter:none;cursor:default}

.stage{border:1px solid var(--line);border-radius:var(--r);background:var(--card);padding:14px 15px;margin-bottom:11px;transition:.2s}
.stage.done{border-color:#2b4a3c;background:linear-gradient(180deg,#0d1a17,#0c1424)}
.sh{display:flex;align-items:flex-start;gap:9px}
.sh h3{font-size:13.5px;font-weight:640;flex:1;line-height:1.5}
.sh .hrs{font-size:10px;color:var(--gold);border:1px solid rgba(232,185,92,.28);border-radius:99px;padding:2px 8px;white-space:nowrap}
.sh .cnt{font-size:10px;color:var(--ink3);white-space:nowrap;padding-top:2px}
.sgoal{font-size:12px;color:var(--ink2);line-height:1.65;margin:6px 0 9px}
.snodes{display:flex;flex-wrap:wrap;gap:5px}
.nchip{
  font-size:11px;padding:3px 8px;border-radius:6px;background:#111a2c;border:1px solid #1d2b45;
  color:#94a6c4;transition:.15s;display:inline-flex;align-items:center;gap:5px;
}
.nchip:hover{border-color:#3b5580;color:#fff;background:#16223a}
.nchip.done{color:#7fbf9d;border-color:#2c4a3c;background:#0e1a18}
.nchip.done:before{content:"✦";font-size:8px}

/* ── 自测 ── */
.qhead{display:flex;align-items:flex-start;gap:14px;margin-bottom:16px}
.qhead h2{font-size:17px;font-weight:660}
.qhead p{font-size:12px;color:var(--ink3);margin-top:4px;line-height:1.6}
.streak{margin-left:auto;text-align:center;border:1px solid var(--line);border-radius:10px;padding:6px 12px;background:#0c1424}
.streak b{display:block;font-size:17px;color:var(--gold);line-height:1.2}
.streak span{font-size:9.5px;color:var(--ink3)}
.qcard{border:1px solid var(--line);border-radius:11px;background:var(--card);margin-bottom:8px;overflow:hidden;transition:.18s}
.qcard:hover{border-color:#2a3a58}
.qcard.open{border-color:#2f4468;background:var(--card2)}
.qh{display:flex;gap:10px;padding:12px 13px;cursor:pointer;align-items:flex-start}
.qh .no{font-size:10px;color:#54627e;padding-top:2px;min-width:22px;font-variant-numeric:tabular-nums}
.qh .qt{font-size:13px;flex:1;line-height:1.6;font-weight:520;color:#d9e4f6}
.qh .dm{font-size:9.5px;color:#5c6b88;white-space:nowrap;padding-top:3px}
.qb{display:none;padding:0 13px 13px 45px;font-size:12.6px;line-height:1.8;color:#b8c6dd}
.qcard.open .qb{display:block}
.qb .lab{display:block;font-size:9.5px;letter-spacing:.14em;color:#5f6f8d;margin:9px 0 3px;text-transform:uppercase}
.qb .lab:first-child{margin-top:0}
.qb .ans{color:#e3edfa}
.qb .fol{color:#a9bdd8}
.qb .trp{color:#dda79f}
.grade{display:flex;gap:7px;margin-top:11px;padding-left:45px}
.grade button{font-size:11.5px;padding:5px 11px;border-radius:7px;border:1px solid #26364f;color:var(--ink2);background:#101a2c}
.grade button.good{border-color:rgba(63,214,164,.35);color:#7fe0bd}
.grade button.good:hover{background:rgba(63,214,164,.12)}
.grade button.again:hover{background:#152036;color:#fff}

/* ── 详情面板 ── */
#panel{
  position:fixed;top:0;right:0;height:100%;width:408px;max-width:92vw;z-index:40;
  background:linear-gradient(180deg,#0c1424,#091220 55%,#081120);
  border-left:1px solid var(--line2);box-shadow:-24px 0 60px rgba(0,0,0,.6);
  transform:translateX(103%);transition:transform .28s cubic-bezier(.4,0,.2,1);
  display:flex;flex-direction:column;
}
#panel.open{transform:none}
.close{position:absolute;top:9px;right:11px;width:30px;height:30px;border-radius:8px;font-size:20px;color:var(--ink3);z-index:2}
.close:hover{background:#17223a;color:#fff}
#panelBody{overflow-y:auto;padding:20px 20px 40px;overscroll-behavior:contain}
.dtag{display:inline-flex;align-items:center;gap:6px;font-size:10px;letter-spacing:.1em;color:var(--ink3);text-transform:uppercase;margin-bottom:6px}
.dtag i{width:7px;height:7px;border-radius:50%}
.dhead h2{font-size:18.5px;line-height:1.35;font-weight:670;padding-right:22px}
.dhead .en{font-size:10.5px;color:var(--ink3);margin-top:3px}
.learnrow{display:flex;align-items:center;gap:8px;margin:13px 0 2px}
.learnbtn{
  font-size:11.5px;padding:5px 12px;border-radius:8px;border:1px solid #2c4a3c;
  color:#7fbf9d;background:rgba(63,214,164,.07);
}
.learnbtn:hover{background:rgba(63,214,164,.14)}
.learnbtn.on{color:#0a1220;background:#7fbf9d;border-color:#7fbf9d;font-weight:600}
.learnrow em{font-style:normal;font-size:10.5px;color:var(--ink3)}
.sec{margin-top:15px}
.sec h4{font-size:10px;letter-spacing:.15em;color:#5f6f8d;text-transform:uppercase;margin-bottom:6px;font-weight:600}
.def{font-size:13.4px;color:#c7d3e7;line-height:1.78}
.pts{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:7px}
.pts li{position:relative;padding-left:14px;font-size:12.8px;color:#b5c3da;line-height:1.7}
.pts li:before{content:"";position:absolute;left:2px;top:9px;width:5px;height:5px;border-radius:50%;background:var(--gold);opacity:.85}
.ansbox{
  font-size:12.9px;color:#d8e4f6;line-height:1.8;padding:10px 12px;border-radius:0 9px 9px 0;
  background:linear-gradient(135deg,rgba(232,185,92,.1),rgba(232,185,92,.03));
  border-left:2px solid rgba(232,185,92,.55);
}
.pit{font-size:12.4px;color:#e0a9a0;line-height:1.7;padding:9px 11px;border-radius:9px;
  background:rgba(200,90,80,.07);border:1px solid rgba(200,90,80,.18)}
.links{display:flex;flex-wrap:wrap;gap:5px}
.lchip{font-size:11px;padding:4px 9px;border-radius:7px;background:#121c31;border:1px solid #223050;color:#a7b7d4}
.lchip:hover{border-color:#3b5580;color:#fff}

/* ── toast / 引导 ── */
#toast{position:fixed;left:50%;bottom:44px;transform:translate(-50%,24px);z-index:60;
  display:flex;flex-direction:column;gap:6px;align-items:center;pointer-events:none}
.tst{
  font-size:12px;padding:7px 14px;border-radius:999px;color:#0a1220;font-weight:600;
  background:linear-gradient(180deg,#f2d493,#dfae52);box-shadow:0 8px 28px rgba(0,0,0,.5);
  animation:tin .3s ease-out both;
}
.tst.dim{background:#18233a;color:#cfdcf0;font-weight:400;border:1px solid #2b3d5e}
@keyframes tin{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

#onboard{position:fixed;inset:0;z-index:70;display:grid;place-items:center;background:rgba(3,6,12,.82);backdrop-filter:blur(6px)}
#onboard.hide{display:none}
.ob-card{
  width:min(420px,90vw);padding:24px;border-radius:16px;border:1px solid #2a3a58;
  background:linear-gradient(165deg,#0e1a2e,#0a1220);box-shadow:0 30px 80px rgba(0,0,0,.7);
}
.ob-card h3{font-size:17px;margin-bottom:8px}
.ob-card p{font-size:12.5px;color:var(--ink2);line-height:1.7}
.ob-card ul{margin:12px 0 18px;padding-left:0;list-style:none;display:flex;flex-direction:column;gap:9px}
.ob-card li{font-size:12.3px;color:#b7c5dc;line-height:1.65;padding-left:16px;position:relative}
.ob-card li:before{content:"✦";position:absolute;left:0;top:1px;font-size:9px;color:var(--gold)}
.ob-card li b{color:#e9f0fb;font-weight:600}
#obGo{width:100%;padding:9px;border-radius:9px;font-size:13px;font-weight:600;color:#0a1220;
  background:linear-gradient(180deg,#f0cd85,#dda947)}
#obGo:hover{filter:brightness(1.06)}


/* ── 架构视图 ── */
.wrap.wide{max-width:1140px}
.seg{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:16px}
.seg button{
  font-size:12px;padding:5px 12px;border-radius:8px;border:1px solid var(--line);
  color:#8fa0bd;background:#0c1424;transition:.15s;
}
.seg button:hover{border-color:#38527c;color:#d5e0f2}
.seg button.on{background:#18233c;color:#fff;border-color:#2f4468}
.shead h2{font-size:18px;font-weight:660;margin-bottom:4px}
.shead p{font-size:12.5px;color:#8fa0bd;line-height:1.6;margin-bottom:18px}
.diagram{position:relative;padding:6px 0 26px;border:1px solid #151f33;border-radius:12px;background:linear-gradient(180deg,#0a1120,#080e1a);overflow:hidden}
.lane{display:flex;gap:10px;align-items:flex-start;margin:0 12px 11px}
.lane:first-child{margin-top:12px}
.lane-t{width:92px;flex:none;font-size:10.5px;color:#5f6f8d;text-align:right;padding-top:9px;line-height:1.4;letter-spacing:.02em}
.lane-b{flex:1;display:flex;flex-wrap:wrap;gap:7px;padding:2px 0}
.sbox{
  border:1px solid #22304a;background:#0d1626;border-radius:7px;padding:6px 9px;
  font-size:11px;line-height:1.45;color:#a9b9d2;transition:.15s;white-space:normal;
}
.sbox.link{cursor:pointer;border-color:#2c4166;color:#c6d6ec;box-shadow:0 0 0 1px rgba(60,90,140,.12) inset}
.sbox.link:hover{border-color:#4a6a9e;background:#13223b;color:#fff}
.diagram svg{position:absolute;left:0;top:0;pointer-events:none;overflow:visible}
.diagram svg path{fill:none;stroke:#46618e;stroke-width:1;stroke-opacity:.75}
.elabel{font-size:9.5px;fill:#7d90b2;font-family:inherit}
.snotes{list-style:none;padding:0;margin:16px 0 0;display:flex;flex-direction:column;gap:7px}
.snotes li{position:relative;padding-left:15px;font-size:12px;color:#93a3c0;line-height:1.7}
.snotes li:before{content:"—";position:absolute;left:0;color:#3f4f6d;font-size:10px;top:1px}
.stip{font-size:10.5px;color:#4c5a74;margin-top:14px}

@media (max-width:820px){
  .lane{flex-direction:column;gap:5px;margin-left:9px;margin-right:9px}
  .lane-t{width:auto;text-align:left;padding-top:0;font-size:10px;color:#6b7c9a;font-weight:600;letter-spacing:.08em}
  .sbox{font-size:10.5px;padding:5px 8px}
  .seg button{font-size:11.5px;padding:4px 10px}
}

/* ── 移动端 ── */
@media (max-width:820px){
  /* 三行栅格：标题 / 工具 / 页签 */
  body{overflow-x:hidden}
  .hud{display:grid;grid-template-columns:1fr auto;gap:7px 8px;padding:8px 10px 9px}
  .logo{grid-column:1;grid-row:1;min-width:0}
  .orb{width:10px;height:10px}
  .lt h1{font-size:12.5px;letter-spacing:0}
  .lt p{display:none}
  .stats{grid-column:2;grid-row:1;flex-direction:row;align-items:center;gap:6px;min-width:0}
  .lvl{display:none}
  .xpbar{display:none}
  .meta{font-size:9.5px;gap:3px;white-space:nowrap}
  .tools{grid-column:1/-1;grid-row:2;width:100%;margin:0;gap:5px}
  .search{flex:1 1 auto;min-width:0;width:auto;padding:5px 8px}
  .search input{font-size:12px}
  .icon{width:30px;height:30px;flex:none}
  .tabs{grid-column:1/-1;grid-row:3;width:100%;display:grid;grid-template-columns:repeat(4,1fr);gap:3px;padding:3px}
  .tabs button{padding:7px 0;font-size:12.5px;text-align:center}
  .chips{left:8px;right:118px;bottom:8px;max-height:none;flex-wrap:nowrap;overflow-x:auto;overflow-y:hidden;padding-bottom:2px;scrollbar-width:none}
  .chips::-webkit-scrollbar{display:none}
  .chip{flex:none;font-size:10.5px;padding:4px 9px}
  .hint{display:none}
  #mini{width:102px;height:71px;right:9px;bottom:9px;opacity:.9}
  .minilabel{display:none}
  #panel{top:auto;bottom:0;left:0;right:0;width:100%;max-width:100%;height:auto;max-height:76vh;
    border-left:0;border-top:1px solid var(--line2);border-radius:16px 16px 0 0;transform:translateY(103%)}
  #panel.open{transform:none}
  #panelBody{max-height:76vh;padding:18px 15px 32px}
  .wrap{padding:16px 12px 60px}
  .qh .dm{display:none}
  .qb{padding-left:13px}
  .grade{padding-left:13px}
  #toast{bottom:96px}
}

/* ── 架构视图 · 自由坐标布局（复原白板拓扑） ── */
.fdiagram{
  border:1px solid #151f33;border-radius:12px;background:
    radial-gradient(1200px 600px at 20% 0%,rgba(70,110,180,.10),transparent 70%),
    linear-gradient(180deg,#0a1120,#080e1a);
  padding:10px 12px;overflow-x:auto;
}
.fdiagram svg{display:block;width:100%;min-width:1040px;height:auto}
.fzone rect{fill:rgba(90,130,200,.045);stroke:rgba(110,150,220,.22);stroke-width:1;stroke-dasharray:5 5}
.fzone.tone-v rect{fill:rgba(63,214,164,.05);stroke:rgba(63,214,164,.24)}
.fzone.tone-c rect{fill:rgba(124,156,255,.05);stroke:rgba(124,156,255,.24)}
.fzone.tone-t rect{fill:rgba(212,176,255,.05);stroke:rgba(212,176,255,.24)}
.fzone.tone-s rect{fill:rgba(192,224,90,.045);stroke:rgba(192,224,90,.22)}
.fzone-t{fill:#7e90ad;font-size:11px;letter-spacing:.08em}

.fbrace path{fill:none;stroke:#4d6285;stroke-width:1.4}
.fbrace text{fill:#8194b4;font-size:10.5px;letter-spacing:.06em}

.fanno rect{fill:rgba(232,185,92,.07);stroke:rgba(232,185,92,.32);stroke-dasharray:4 3}
.fanno text{fill:#c6b083;font-size:10px}
.fanno.tone-b rect{fill:rgba(124,156,255,.06);stroke:rgba(124,156,255,.3)}
.fanno.tone-b text{fill:#a8b6d8}
.fanno.tone-g rect{fill:rgba(63,214,164,.05);stroke:rgba(63,214,164,.26)}
.fanno.tone-g text{fill:#8fc9b3}

.fbox rect{fill:#101a2c;stroke:#24354f;stroke-width:1}
.fbox text{fill:#c3d2e8;font-size:10.2px;pointer-events:none}
.fbox.link{cursor:pointer}
.fbox.link rect{stroke:#2c4166}
.fbox.link:hover rect{stroke:#5b82bb;fill:#152442}
.fbox.link:hover text{fill:#fff}
.fbox.k-cloud rect{fill:rgba(232,185,92,.08);stroke:rgba(232,185,92,.4);stroke-dasharray:none}
.fbox.k-cloud text{fill:#e0c489}
.fbox.k-pill rect{fill:rgba(63,214,164,.1);stroke:rgba(63,214,164,.42)}
.fbox.k-pill text{fill:#7fd9b8}

.flink{fill:none;stroke:#5a78a8;stroke-width:1.15;stroke-opacity:.9}
.flink-t{fill:#7f93b5;font-size:9.5px}
.fbox.k-label rect{fill:transparent;stroke:none}
.fbox.k-label text{fill:#6e7f9c;font-size:9.6px;letter-spacing:.04em}
.fbox{border:0;background:none;padding:0}