/* Layout: one full-bleed landscape built from four stacked layers (line landscape, WebGL water/highlight, buildings + trees, WebGL markers); glass HUD panels float over it. Deliberately single-theme: Klein blue ground, white line work, white-wall/dark-tile buildings, gold light for 奇门 markers. */
:root{
  color-scheme:dark;
  --bg:#002fa7; --deep:#001f78; --glass:rgba(0,26,110,.46);
  --line:rgba(235,242,255,.17); --line-hi:rgba(235,242,255,.45);
  --tx:#eef3ff; --tx2:rgba(238,243,255,.72); --tx3:rgba(238,243,255,.46);
  --gold:#ffd27a;
  --paper:#0a36ad; --ln:#eef3ff; --lnd:#0b1a55;
  --f-serif:"Noto Serif SC","Songti SC","STSong",serif;
  --f-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html,body{height:100%}
body{background:var(--bg);color:var(--tx);font:14px/1.6 var(--f-sans);-webkit-font-smoothing:antialiased;overflow:hidden;margin:0}
button{font-family:inherit;color:inherit}
button:focus-visible{outline:2px solid var(--tx);outline-offset:2px}
svg :focus{outline:none}
.stage{position:fixed;inset:0;background:radial-gradient(120% 100% at 50% 42%,#0839c4 0%,#002fa7 52%,#001d70 100%);touch-action:none;cursor:grab;overflow:hidden}
.stage.dragging{cursor:grabbing}
.stage>svg,.stage>canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.stage>canvas{pointer-events:none}
#sObj{pointer-events:none}
#sObj [data-z]{pointer-events:visiblePainted;cursor:pointer}
.vig{position:fixed;inset:0;pointer-events:none;background:radial-gradient(110% 95% at 50% 46%,transparent 60%,rgba(0,20,84,.5) 100%)}
.grain{position:fixed;inset:0;pointer-events:none;opacity:.14;mix-blend-mode:soft-light;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 .55 0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E")}

header{position:fixed;top:0;left:0;right:0;height:60px;display:flex;align-items:center;gap:18px;padding:0 24px;background:linear-gradient(rgba(0,24,100,.55),rgba(0,24,100,0));pointer-events:none}
header>*{pointer-events:auto}
.logo{display:grid;grid-template-columns:repeat(3,6px);gap:2px}
.logo b{width:6px;height:6px;border:1px solid var(--tx);display:block}
.logo b:nth-child(5){background:var(--gold);border-color:var(--gold)}
header h1{font:900 19px var(--f-serif);letter-spacing:.14em;margin:0}
header .src{font:11px var(--f-mono);color:var(--tx3);letter-spacing:.1em}
.hdr-r{margin-left:auto;display:flex;gap:22px;align-items:baseline;font:500 13px var(--f-mono);color:var(--tx2);font-variant-numeric:tabular-nums}
.hdr-r b{color:var(--tx);font-weight:500}

aside{position:fixed;top:68px;bottom:78px;width:288px;display:flex;flex-direction:column;gap:12px;overflow:auto;scrollbar-width:none}
aside::-webkit-scrollbar{display:none}
aside.l{left:18px}
aside.r{right:18px;width:330px}
.pn{position:relative;background:var(--glass);-webkit-backdrop-filter:blur(14px) saturate(120%);backdrop-filter:blur(14px) saturate(120%);border:1px solid var(--line);padding:14px}
.pn::before,.pn::after{content:"";position:absolute;width:9px;height:9px;border:1px solid var(--line-hi)}
.pn::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.pn::after{bottom:-1px;right:-1px;border-left:0;border-top:0}
.pn-h{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:10px;font:500 10.5px var(--f-mono);letter-spacing:.16em;color:var(--tx3);text-transform:uppercase}
.big{font:900 32px/1.1 var(--f-serif);letter-spacing:.08em}
.kv{display:grid;grid-template-columns:auto 1fr;gap:4px 14px;margin:10px 0 0;font-size:12.5px}
.kv dt{color:var(--tx3)}.kv dd{margin:0;text-align:right;font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.note{font-size:11px;color:var(--tx3);margin:8px 0 0}
.map9{display:grid;grid-template-columns:repeat(3,1fr);gap:4px}
.map9 button{aspect-ratio:1.1;border:1px solid var(--line);background:none;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;transition:background .25s,border-color .25s}
.map9 button b{font:600 19px var(--f-serif)}
.map9 button span{font:10px var(--f-mono);color:var(--tx3)}
.map9 button:hover{border-color:var(--line-hi)}
.map9 button[aria-pressed="true"]{background:var(--tx);color:var(--bg);border-color:var(--tx)}
.map9 button[aria-pressed="true"] span{color:rgba(0,47,167,.6)}
.map9 button.today::after{content:"";position:absolute;top:5px;right:5px;width:5px;height:5px;border-radius:50%;background:var(--gold);box-shadow:0 0 8px var(--gold)}
.gauge svg{display:block;width:100%;height:auto}
.empty p{margin:0 0 10px;color:var(--tx2);font-size:13px}
.leg{display:grid;gap:8px}
.leg div{display:flex;align-items:center;gap:10px;font-size:12.5px;color:var(--tx2)}
.leg svg{flex:none}
.zh{display:flex;align-items:flex-end;gap:14px}
.zh .gua{font:900 62px/0.9 var(--f-serif)}
.zh .meta{padding-bottom:4px}
.zh .meta b{display:block;font:600 16px var(--f-serif);letter-spacing:.1em}
.zh .meta span{font:11px var(--f-mono);color:var(--tx3);letter-spacing:.08em}
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.tile{border:1px solid var(--line);padding:8px 10px;background:var(--glass);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.tile span{display:block;font:10px var(--f-mono);letter-spacing:.12em;color:var(--tx3)}
.tile b{font:600 17px var(--f-serif);letter-spacing:.06em}
.tile i{font-style:normal;font-size:11px;margin-left:6px;padding:0 6px;border:1px solid var(--line-hi);border-radius:99px;color:var(--tx2);vertical-align:2px}
.tile i.ji{background:var(--gold);color:#2a1a00;border-color:var(--gold)}
.chips{display:flex;flex-wrap:wrap;gap:5px}
.chips span{font-size:12px;padding:1px 8px;border:1px solid var(--line);color:var(--tx2)}
.wx{display:flex;gap:12px;align-items:center}
.wx svg{flex:none;width:112px;height:112px}
.wx p{margin:0;font-size:12px;color:var(--tx2);line-height:1.7}
.quote{font:600 14px/1.9 var(--f-serif);color:var(--tx);border-left:2px solid var(--gold);padding:2px 0 2px 12px;background:var(--glass);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.quote cite{display:block;font:10.5px var(--f-mono);font-style:normal;color:var(--tx3);letter-spacing:.08em;margin-top:2px}

footer{position:fixed;left:0;right:0;bottom:0;height:70px;display:flex;align-items:center;gap:14px;padding:0 24px;background:linear-gradient(rgba(0,24,100,0),rgba(0,24,100,.6));pointer-events:none}
footer>*{pointer-events:auto}
.modes{display:flex;border:1px solid var(--line);background:var(--glass);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.modes button{background:none;border:0;border-right:1px solid var(--line);padding:8px 16px;font-size:13px;color:var(--tx2);cursor:pointer;letter-spacing:.08em;display:flex;align-items:center;gap:8px}
.modes button:last-child{border-right:0}
.modes button svg{width:14px;height:14px}
.modes button[aria-pressed="true"]{background:var(--tx);color:var(--bg)}
.ghost{background:var(--glass);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border:1px solid var(--line);padding:8px 14px;font-size:13px;color:var(--tx2);cursor:pointer}
.ghost:hover,.modes button:hover{color:var(--tx)}
.modes button[aria-pressed="true"]:hover{color:var(--bg)}
.cap{font:500 12px var(--f-mono);color:var(--tx2);letter-spacing:.08em}
.foot-r{margin-left:auto;font:11px var(--f-mono);color:var(--tx3);letter-spacing:.06em}
.hint{position:fixed;left:50%;top:74px;transform:translateX(-50%);font:11px var(--f-mono);letter-spacing:.14em;color:var(--tx3);pointer-events:none;white-space:nowrap;transition:opacity .4s}

/* svg drawing */
.ln,.base,.mat{--dl:calc(var(--k,0) * var(--step,.002s))}
.ln{fill:none;stroke:var(--ln);stroke-width:calc(var(--lw,.9) * var(--u,1) * 1px);stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:1 1;stroke-dashoffset:1;stroke-opacity:0;
  transition:stroke-dashoffset .9s cubic-bezier(.6,.04,.3,1) var(--dl),stroke-opacity .1s linear var(--dl)}
.ln.w2{--lw:1.25}.ln.w0{--lw:.6}.ln.w3{--lw:1.6}
.bd .ln{stroke:var(--lnd)}
.bd .ln.lt{stroke:rgba(214,226,255,.9)}
.drawn .ln{stroke-dashoffset:0;stroke-opacity:var(--lo,.9)}
.settled .ln{stroke-dasharray:none}
.base{fill:var(--paper);opacity:0;transition:opacity .35s ease calc(var(--dl) + .2s)}
.drawn .base{opacity:1}
.mat{opacity:0;transition:opacity 1.1s ease calc(var(--k,0) * var(--mstep,.001s))}
.matted .mat{opacity:var(--mo,1)}
.wl{fill:none;stroke:#eef3ff;stroke-linecap:round;stroke-linejoin:round}
.hit{fill:transparent;cursor:pointer}
.windy .sway{transform-box:fill-box;transform-origin:50% 100%;animation:sway var(--sd,5s) ease-in-out var(--sdl,0s) infinite alternate}
@keyframes sway{from{transform:rotate(calc(var(--sa,1.2deg) * -1))}to{transform:rotate(var(--sa,1.2deg))}}
.windy .sway{--sa:3.5deg;--sd:1.4s}

@media (max-width:1100px){
  body{overflow:auto}
  .stage{position:relative;height:72vh}
  .vig,.grain{position:absolute;height:72vh}
  header{position:absolute;flex-wrap:wrap;height:auto;padding:12px 16px;gap:6px 14px}
  .hdr-r{margin-left:0;font-size:12px;gap:12px}
  .hint{position:absolute}
  footer{position:relative;height:auto;flex-wrap:wrap;padding:12px 16px;background:var(--deep)}
  aside{position:static;width:auto!important;padding:12px 16px;overflow:visible}
  .foot-r{display:none}
}
@media (max-width:520px){.modes button{padding:7px 9px;font-size:12px}.modes button svg{display:none}header .src{display:none}}
@media (prefers-reduced-motion:reduce){.ln,.base,.mat{transition:none!important}.sway{animation:none}}
/* ===== 学堂 layer: one world, two tabs. 修行 = path of nine stations over the sand table; 沙盘 = free exploration. Lessons dock beside the map so the world stays in view. ===== */
[hidden]{display:none!important}
:root{--cin:#ff7a5c;--cin-d:#c9452c;--ok:#ffd27a;--plate:rgba(3,22,92,.92);--plate2:rgba(6,30,118,.94);--hair:rgba(235,242,255,.22)}
body[data-tab="learn"] aside.l,body[data-tab="learn"] aside.r,body[data-tab="learn"] footer,body[data-tab="learn"] .hint,
body[data-tab="lesson"] aside.l,body[data-tab="lesson"] aside.r,body[data-tab="lesson"] footer,body[data-tab="lesson"] .hint{display:none}
body[data-tab="explore"] .lp,body[data-tab="explore"] .rp,body[data-tab="explore"] .cta,body[data-tab="explore"] .stations,body[data-tab="explore"] #spath,
body[data-tab="lesson"] .lp,body[data-tab="lesson"] .rp,body[data-tab="lesson"] .cta,body[data-tab="lesson"] .stations,body[data-tab="lesson"] #spath{display:none}
body:not([data-tab="lesson"]) .lesson{display:none}
body[data-tab="learn"] .hdr-r,body[data-tab="lesson"] .hdr-r,body[data-tab="learn"] header .src,body[data-tab="lesson"] header .tabs{display:none}

header .tabs{display:flex;border:1px solid var(--line);margin-left:6px}
header .tabs button{background:none;border:0;padding:6px 14px;font:500 13px var(--f-sans);letter-spacing:.12em;color:var(--tx2);cursor:pointer}
header .tabs button[aria-pressed="true"]{background:var(--tx);color:var(--bg)}
.hud{display:flex;align-items:center;gap:8px;margin-left:auto}
.hud .st{display:flex;align-items:center;gap:6px;height:32px;padding:0 10px;border:1px solid var(--line);background:var(--plate);font:500 13px var(--f-mono);color:var(--tx);cursor:pointer;font-variant-numeric:tabular-nums}
.hud .st svg{width:16px;height:16px;flex:none}
.hud .st small{font:11px var(--f-sans);color:var(--tx3)}
.hud .st.lit{border-color:rgba(255,210,122,.6)}
.hud .st.lit svg{color:var(--ok)}
.hud .ring{position:relative;width:22px;height:22px}
.hud .ring svg{width:22px;height:22px;transform:rotate(-90deg)}
body[data-tab="explore"] .hud{margin-left:24px}

/* panels */
.lp,.rp{position:fixed;top:68px;bottom:18px;display:flex;flex-direction:column;gap:12px;overflow:auto;scrollbar-width:none;z-index:2}
.lp::-webkit-scrollbar,.rp::-webkit-scrollbar{display:none}
.lp{left:18px;width:318px}.rp{right:18px;width:300px}
.lp .pn,.rp .pn{background:var(--plate);-webkit-backdrop-filter:none;backdrop-filter:none}
.rank{display:grid;grid-template-columns:auto 1fr;gap:4px 14px;align-items:center}
.rank .seal{grid-row:span 2}
.rank b{font:900 22px/1.1 var(--f-serif);letter-spacing:.1em}
.rank .bar{height:4px;background:rgba(238,243,255,.14);position:relative}
.rank .bar i{position:absolute;inset:0 auto 0 0;background:var(--ok);width:0;transition:width .8s}
.rank small{grid-column:1/-1;font:11px var(--f-mono);color:var(--tx3);letter-spacing:.06em}

.seal{width:46px;height:46px;border:2px solid var(--cin);color:var(--cin);display:grid;place-items:center;font:900 20px/1 var(--f-serif);position:relative;flex:none}
.seal::after{content:"";position:absolute;inset:3px;border:1px solid rgba(255,122,92,.5)}
.seal.dim{border-color:rgba(238,243,255,.25);color:rgba(238,243,255,.3)}
.seal.dim::after{border-color:rgba(238,243,255,.12)}
.seal.sm{width:34px;height:34px;font-size:15px;border-width:1.5px}

.units{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.unit{border:1px solid transparent;padding:10px 8px 10px 10px;display:grid;grid-template-columns:34px 1fr auto;gap:2px 10px;align-items:center}
.unit .no{grid-row:span 2;font:900 26px/1 var(--f-serif);color:var(--tx2);text-align:center}
.unit .nm{font:600 15px var(--f-serif);letter-spacing:.08em}
.unit .sb{font-size:11.5px;color:var(--tx3)}
.unit .ls{grid-column:1/-1;display:grid;grid-template-columns:repeat(4,1fr);gap:5px;margin-top:8px}
.unit .ls button{min-width:0;height:30px;border:1px solid var(--line);background:none;font:12px var(--f-sans);letter-spacing:.02em;color:var(--tx2);cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding:0 4px;position:relative}
.unit .ls button.done{border-color:rgba(255,210,122,.55);color:var(--ok)}
.unit .ls button.next{background:var(--tx);color:var(--bg);border-color:var(--tx);font-weight:500}
.unit .ls button.boss.done{border-color:var(--cin);color:var(--cin)}
.unit .ls button:disabled{opacity:.35;cursor:not-allowed}
.unit .ls button.stale::after{content:"";position:absolute;top:3px;right:3px;width:5px;height:5px;border-radius:50%;background:var(--cin)}
.unit.cur{border-color:var(--line-hi);background:rgba(238,243,255,.04)}
.unit.locked{opacity:.45}
.unit.locked .ls{display:none}
.unit .st2{font:10.5px var(--f-mono);color:var(--tx3);letter-spacing:.06em;text-align:right}
.unit.sealed .no{color:var(--cin)}

.week{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;margin:4px 0 12px}
.week div{display:flex;flex-direction:column;align-items:center;gap:4px;font:10.5px var(--f-mono);color:var(--tx3)}
.week i{width:26px;height:26px;border:1px solid var(--line);display:grid;place-items:center;font-style:normal}
.week i.on{background:var(--ok);border-color:var(--ok);color:#2a1a00}
.week i.fz{border-color:var(--tx2);color:var(--tx2)}
.week i.today{outline:1px solid var(--tx);outline-offset:2px}
.quests{display:flex;flex-direction:column;gap:9px}
.quest{display:grid;grid-template-columns:1fr auto;gap:4px 10px;font-size:12.5px;color:var(--tx2)}
.quest .bar{grid-column:1/-1;height:3px;background:rgba(238,243,255,.14);position:relative}
.quest .bar i{position:absolute;inset:0 auto 0 0;background:var(--tx);transition:width .6s}
.quest.done{color:var(--ok)}.quest.done .bar i{background:var(--ok)}
.quest span:last-child{font:11px var(--f-mono);color:var(--tx3)}
.rv{display:flex;align-items:center;gap:12px}
.rv .big{font-size:30px}
.rv p{margin:0;font-size:12px;color:var(--tx2);flex:1}
.btn{height:36px;padding:0 16px;border:1px solid var(--tx);background:var(--tx);color:var(--bg);font:500 13px var(--f-sans);letter-spacing:.1em;cursor:pointer}
.btn.ghost2{background:none;color:var(--tx);border-color:var(--line-hi)}
.btn:disabled{opacity:.35;cursor:not-allowed}
.seals{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
.seals button{background:none;border:0;padding:0;display:grid;place-items:center;cursor:pointer}
.qcount{display:flex;justify-content:space-between;align-items:center;font-size:12.5px;color:var(--tx2)}

/* stations over the map */
#spath{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}
.stations{position:absolute;inset:0;pointer-events:none}
.sta{position:absolute;left:0;top:0;transform:translate(-50%,-50%);pointer-events:auto;background:none;border:0;padding:0;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:4px}
.sta .d{width:44px;height:44px;position:relative;display:grid;place-items:center;background:var(--plate2);border:1px solid var(--hair);font:900 19px/1 var(--f-serif);color:var(--tx)}
.sta .d svg{position:absolute;inset:-5px;width:54px;height:54px;transform:rotate(-90deg);overflow:visible}
.sta .l{font:500 11.5px var(--f-sans);letter-spacing:.1em;background:var(--plate);padding:1px 7px;white-space:nowrap;color:var(--tx2)}
.sta.locked .d{color:rgba(238,243,255,.35);border-style:dashed}
.sta.locked .l{color:var(--tx3)}
.sta.cur .d{background:var(--tx);color:var(--bg);border-color:var(--tx);box-shadow:0 0 0 6px rgba(238,243,255,.14)}
.sta.cur .l{color:var(--tx)}
.sta.cur::before{content:"";position:absolute;top:-2px;width:44px;height:44px;border:1px solid var(--tx);animation:ping 2.2s ease-out infinite;pointer-events:none}
@keyframes ping{from{transform:scale(1);opacity:.7}to{transform:scale(1.9);opacity:0}}
.sta.sealed .d{border:2px solid var(--cin);color:var(--cin)}
.sta.stale .d::after{content:"";position:absolute;top:-4px;right:-4px;width:9px;height:9px;border-radius:50%;background:var(--cin);border:2px solid var(--bg)}
.sta:focus-visible .d{outline:2px solid var(--tx);outline-offset:3px}

.cta{position:fixed;left:50%;bottom:22px;transform:translateX(-50%);z-index:3}
.go{display:flex;flex-direction:column;align-items:center;gap:1px;min-width:250px;padding:10px 28px;background:var(--tx);color:var(--bg);border:0;cursor:pointer;box-shadow:0 10px 30px rgba(0,16,80,.45)}
.go small{font:500 11px var(--f-mono);letter-spacing:.16em;opacity:.65}
.go b{font:900 18px var(--f-serif);letter-spacing:.14em}
.go:hover{background:#fff}

/* lesson */
.lesson{position:fixed;top:0;right:0;bottom:0;width:min(520px,44vw);background:#04217f;border-left:1px solid var(--hair);display:flex;flex-direction:column;z-index:6}
.lh{display:flex;align-items:center;gap:14px;padding:16px 20px 10px}
.lh .x{width:34px;height:34px;border:1px solid var(--line);background:none;font-size:18px;line-height:1;cursor:pointer;color:var(--tx2)}
.lh .bar{flex:1;height:8px;background:rgba(238,243,255,.12);position:relative;overflow:hidden}
.lh .bar i{position:absolute;inset:0 auto 0 0;background:var(--ok);width:0;transition:width .45s cubic-bezier(.3,.7,.3,1)}
.lh .combo{font:600 13px var(--f-mono);color:var(--ok);min-width:56px;text-align:right;letter-spacing:.06em;transition:transform .2s}
.lh .combo.bump{transform:scale(1.3)}
.lmeta{padding:0 20px;font:11px var(--f-mono);color:var(--tx3);letter-spacing:.12em}
.lb{flex:1;overflow:auto;padding:14px 20px 20px;display:flex;flex-direction:column;gap:16px}
.lb .kind{font:500 11px var(--f-mono);letter-spacing:.18em;color:var(--tx3)}
.lb h2{font:900 23px/1.45 var(--f-serif);letter-spacing:.04em;margin:0;text-wrap:balance}
.lb .body{font-size:15px;line-height:1.85;color:var(--tx2);margin:0}
.qt{font:600 15px/1.9 var(--f-serif);border-left:2px solid var(--ok);padding:4px 0 4px 14px;color:var(--tx)}
.qt cite{display:block;font:11px var(--f-mono);font-style:normal;color:var(--tx3);letter-spacing:.06em;margin-top:2px}
.opts{display:grid;gap:10px}
.opt{display:flex;align-items:center;gap:12px;min-height:52px;padding:10px 14px;border:1px solid var(--hair);background:rgba(238,243,255,.03);font:500 16px var(--f-sans);color:var(--tx);text-align:left;cursor:pointer;transition:background .15s,border-color .15s,transform .1s}
.opt:hover{border-color:var(--line-hi)}
.opt:active{transform:translateY(1px)}
.opt kbd{font:11px var(--f-mono);color:var(--tx3);border:1px solid var(--line);width:22px;height:22px;display:grid;place-items:center;flex:none}
.opt[aria-pressed="true"]{border-color:var(--tx);background:rgba(238,243,255,.12)}
.opt.right{border-color:var(--ok);background:rgba(255,210,122,.16);color:var(--ok)}
.opt.wrong{border-color:var(--cin);background:rgba(255,122,92,.14);color:var(--cin)}
.opts.two{grid-template-columns:1fr 1fr}
.opt.big{justify-content:center;font:900 22px var(--f-serif);min-height:64px}

.board{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;max-width:330px;width:100%;margin:0 auto;position:relative}
.board .cell{aspect-ratio:1;border:1px solid var(--hair);background:rgba(238,243,255,.03);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;cursor:pointer;position:relative;color:var(--tx);font:inherit;padding:0;transition:background .15s,border-color .15s}
.board .cell .v{font:900 24px/1 var(--f-serif)}
.board .cell .v.sm{font-size:17px}
.board .cell .h{font:10px var(--f-mono);color:var(--tx3);letter-spacing:.06em}
.board .cell .h.only{font:500 14px var(--f-sans);color:var(--tx2);letter-spacing:.1em}
.board .cell:hover{border-color:var(--line-hi)}
.board .cell.pre{cursor:default;background:rgba(238,243,255,.08)}
.board .cell.pre .v{color:var(--tx2)}
.board .cell.hi{border-color:var(--ok);background:rgba(255,210,122,.14)}
.board .cell.sel{border-color:var(--tx);background:rgba(238,243,255,.14)}
.board .cell.right{border-color:var(--ok);background:rgba(255,210,122,.2)}
.board .cell.wrong{border-color:var(--cin);background:rgba(255,122,92,.18)}
.board .cell.filled .v{color:var(--tx)}
.board .cell.drop{border-style:dashed;border-color:var(--line-hi)}
.board.ro .cell{cursor:default}
.compass{text-align:center;margin:0 auto 6px;font:10.5px var(--f-mono);color:var(--tx3);letter-spacing:.16em}
.hint2{font-size:12px;color:var(--tx3);text-align:center;margin:-6px 0 0}
.tokens{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.tok{min-width:46px;height:46px;padding:0 12px;border:1px solid var(--hair);background:var(--plate2);font:900 19px var(--f-serif);color:var(--tx);cursor:pointer;transition:transform .12s,opacity .2s}
.tok[aria-pressed="true"]{background:var(--tx);color:var(--bg);border-color:var(--tx);transform:translateY(-3px)}
.tok.used{opacity:.18;pointer-events:none}
.tok.wide{font:500 15px var(--f-sans)}
.seq{min-height:58px;border-bottom:1px solid var(--hair);display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:6px 0}
.seq .tok{height:40px;min-width:40px;font-size:17px}
.seq:empty::before{content:"依次点下面的字";font-size:12px;color:var(--tx3)}
.pairs{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.pairs .col{display:flex;flex-direction:column;gap:10px}
.pairs .tok{width:100%;font:600 16px var(--f-serif)}
.pairs .tok.ok{border-color:var(--ok);color:var(--ok);background:rgba(255,210,122,.1);pointer-events:none}
.pairs .tok.bad{border-color:var(--cin);color:var(--cin);animation:shake .35s}
@keyframes shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.tfw{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.dia{margin:2px 0}

.lf{padding:14px 20px 20px;border-top:1px solid var(--hair);display:flex;flex-direction:column;gap:12px;transition:background .25s}
.lf.right{background:rgba(255,210,122,.12)}
.lf.wrong{background:rgba(255,122,92,.12)}
.fb{display:none;gap:4px;flex-direction:column}
.lf.right .fb,.lf.wrong .fb{display:flex}
.fb b{font:900 19px var(--f-serif);letter-spacing:.08em}
.lf.right .fb b{color:var(--ok)}.lf.wrong .fb b{color:var(--cin)}
.fb p{margin:0;font-size:14px;line-height:1.7;color:var(--tx2)}
.fb .qt{font-size:13.5px;margin-top:4px}
.lf .btn{height:50px;font-size:16px;letter-spacing:.2em;width:100%}
.lf.wrong .btn{background:var(--cin);border-color:var(--cin);color:#2a0a00}
.lf.right .btn{background:var(--ok);border-color:var(--ok);color:#2a1a00}

/* modal: results, quotes, achievements */
.modal{position:fixed;inset:0;z-index:20;background:rgba(0,14,60,.62);display:grid;place-items:center;padding:16px}
.mcard{width:min(460px,100%);max-height:calc(100% - 32px);overflow:auto;background:var(--plate2);border:1px solid var(--hair);padding:26px 24px 22px;display:flex;flex-direction:column;gap:16px;position:relative}
.mcard h2{font:900 26px var(--f-serif);letter-spacing:.12em;margin:0;text-align:center}
.mcard .k{font:500 11px var(--f-mono);letter-spacing:.2em;color:var(--tx3);text-align:center}
.mcard .stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.mcard .stats div{border:1px solid var(--hair);padding:10px 6px;text-align:center}
.mcard .stats b{display:block;font:600 24px var(--f-mono);font-variant-numeric:tabular-nums}
.mcard .stats span{font-size:11px;color:var(--tx3);letter-spacing:.1em}
.mcard .stamp{align-self:center;width:96px;height:96px;font-size:40px;border-width:3px;animation:stamp .55s cubic-bezier(.2,1.6,.4,1) both}
@keyframes stamp{from{transform:scale(2.4) rotate(-12deg);opacity:0}to{transform:scale(1) rotate(-4deg);opacity:1}}
.mcard .row{display:flex;gap:10px}
.mcard .row .btn{flex:1;height:46px}
.mcard .list{display:flex;flex-direction:column;gap:12px}
.mcard .ach{display:flex;gap:12px;align-items:center;font-size:13px;color:var(--tx2)}
.mcard .ach b{display:block;color:var(--tx);font:600 14px var(--f-serif);letter-spacing:.06em}
.mcard .close{position:absolute;top:10px;right:10px;width:32px;height:32px;border:1px solid var(--line);background:none;color:var(--tx2);cursor:pointer;font-size:16px}
.newbits{display:flex;flex-direction:column;gap:8px}
.newbits div{display:flex;gap:10px;align-items:center;font-size:13px;color:var(--tx2);border:1px solid var(--hair);padding:8px 10px}
.newbits div b{color:var(--ok);font-weight:500}
.goal{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.goal button{border:1px solid var(--hair);background:none;padding:12px 4px;cursor:pointer;color:var(--tx);display:flex;flex-direction:column;gap:2px;align-items:center}
.goal button b{font:600 20px var(--f-mono)}
.goal button span{font-size:11px;color:var(--tx3)}
.goal button[aria-pressed="true"]{border-color:var(--tx);background:rgba(238,243,255,.12)}

.toasts{position:fixed;top:72px;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;gap:8px;z-index:30;pointer-events:none;align-items:center}
.toast{background:var(--plate2);border:1px solid rgba(255,210,122,.5);padding:10px 16px;font-size:13px;display:flex;gap:10px;align-items:center;animation:tin .4s cubic-bezier(.2,1.2,.4,1) both;max-width:calc(100vw - 32px)}
.toast b{color:var(--ok);font-weight:500}
.toast.out{animation:tout .35s ease both}
@keyframes tin{from{transform:translateY(-14px);opacity:0}}
@keyframes tout{to{transform:translateY(-10px);opacity:0}}
.burst{position:fixed;pointer-events:none;z-index:25;font:900 20px var(--f-mono);color:var(--ok);animation:rise 1s ease-out both;text-shadow:0 2px 12px rgba(0,10,60,.6)}
@keyframes rise{from{transform:translate(-50%,0);opacity:1}to{transform:translate(-50%,-60px);opacity:0}}
.footer-mode-lock{opacity:.4}
.modes button.locked{opacity:.38}
.modes button.locked::after{content:"锁";font-size:10px;border:1px solid currentColor;padding:0 3px;margin-left:2px}

@media (max-width:1100px){
  body[data-tab="learn"] .stage{height:58vh}
  body[data-tab="learn"] .vig,body[data-tab="learn"] .grain{height:58vh}
  .lp,.rp{position:static;width:auto!important;padding:12px 16px 0;overflow:visible}
  .rp{padding-bottom:24px}
  .cta{position:sticky;bottom:12px;left:auto;transform:none;display:flex;justify-content:center;padding:12px 16px 0}
  .go{width:100%;min-width:0}
  .hud{margin-left:auto}
  header .tabs{margin-left:0}
  .hud .st{height:30px;padding:0 8px}
  body[data-tab="lesson"]{overflow:hidden}
  body[data-tab="lesson"] header{display:none}
  body[data-tab="lesson"] .stage{position:fixed;top:0;left:0;right:0;height:34vh}
  body[data-tab="lesson"] .vig,body[data-tab="lesson"] .grain{position:fixed;height:34vh}
  .lesson{top:34vh;width:100%;border-left:0;border-top:1px solid var(--hair)}
  .lb h2{font-size:20px}
  .sta .d{width:36px;height:36px;font-size:16px}
  .sta .d svg{width:46px;height:46px}
  .sta .l{font-size:10.5px}
  .sta.cur::before{width:36px;height:36px}
}
@media (max-width:640px){
  header h1{font-size:16px}
  .hud .st small,.hud .xpt{display:none}
  .board{max-width:280px}
  .compass{max-width:280px}
  .opt{min-height:48px;font-size:15px}
  .sta .l{display:none}
}
@media (prefers-reduced-motion:reduce){.sta.cur::before,.mcard .stamp,.toast,.burst{animation:none}}

/* 神龟 */
.turtle{cursor:pointer;pointer-events:auto}
.turtle .bob{animation:bob 7s ease-in-out infinite}
.turtle .rip{fill:none;stroke:rgba(225,236,255,.55);stroke-width:calc(.6px * var(--u,1));transform-box:fill-box;transform-origin:center;animation:rip 6.6s linear infinite}
@keyframes bob{50%{transform:translateY(-1.2px)}}
@keyframes rip{0%{transform:scale(.86);opacity:0}18%{opacity:.75}100%{transform:scale(1.55);opacity:0}}
@media (prefers-reduced-motion:reduce){.turtle .bob,.turtle .rip{animation:none}.turtle .rip{opacity:.3}}

/* 关于 */
header .abt{background:none;border:1px solid var(--line);padding:6px 12px;font:500 13px var(--f-sans);letter-spacing:.12em;color:var(--tx2);cursor:pointer}
header .abt:hover{color:var(--tx)}
body[data-tab="lesson"] header .abt{display:none}
.mcard.about{width:min(500px,100%);padding-top:0;overflow-x:hidden}
.mcard.about .hero{display:block;width:calc(100% + 48px);height:auto;margin:0 -24px -6px;background:radial-gradient(70% 70% at 50% 55%,rgba(60,110,255,.35),transparent 70%)}
.mcard.about .body{margin:0;color:var(--tx2);font-size:14px;line-height:1.8;text-align:center}
.mcard.about dl{display:grid;grid-template-columns:auto 1fr;gap:10px 16px;margin:0;padding:14px 0;border-top:1px solid var(--hair);border-bottom:1px solid var(--hair);font-size:13px;line-height:1.7;color:var(--tx2)}
.mcard.about dt{font:500 11px var(--f-mono);letter-spacing:.2em;color:var(--tx3);padding-top:3px}
.mcard.about dd{margin:0}
.mcard.about dd b{font:700 16px var(--f-serif);letter-spacing:.12em;color:var(--tx)}
.mcard.about a{color:var(--ok);text-decoration:none;border-bottom:1px solid rgba(255,210,122,.4)}
.mcard.about a:hover{border-bottom-color:var(--ok)}
.mcard.about .note{margin:0;font-size:12px;color:var(--tx3);text-align:center}
header h1{cursor:pointer}
@media (max-width:640px){header .abt{display:none}header h1::after{content:"ⓘ";font:400 12px var(--f-sans);color:var(--tx3);margin-left:4px;vertical-align:2px}}


/* Keep the scene still while reading; animate only while its scheduler is active. */
.ln,.base,.mat{transition:none!important}
.pn,.tile,.quote,.modes,.ghost{-webkit-backdrop-filter:none;backdrop-filter:none;background:rgba(0,26,100,.88)}
.grain{display:none}
.scene-paused .stage *, .scene-paused .sta.cur::before{animation-play-state:paused!important}

/* Small, on-demand Blender objects; only the open card owns a renderer. */
.model-card{position:relative;isolation:isolate;flex-shrink:0;height:260px;overflow:hidden;background:radial-gradient(ellipse at 45% 30%,#1249ce 0,#0737b0 60%,#002983 100%);border:1px solid #ffffff30;touch-action:pan-y}
.model-card::after{content:'';position:absolute;z-index:-1;left:25%;right:25%;bottom:12%;height:8%;background:#000c46a0;filter:blur(14px);border-radius:50%}
.model-card canvas,.model-card .model-placeholder{position:absolute;inset:0;width:100%;height:100%;object-fit:contain}
.model-card[data-state=ready] .model-placeholder{visibility:hidden}
.model-card--seal{height:240px;margin:-5px -4px 0;border-radius:0}
.mcard.about .model-card--compass{width:calc(100% + 48px);height:320px;margin:0 -24px -6px;border:0}
.mcard.about .close{z-index:2}
@media(max-width:480px){.mcard.about .model-card--compass{height:250px}.model-card--seal{height:210px}}
.mcard.about:has(.model-card) .close{color:#eef3ff;background:#002983b3;border:1px solid #b5ceff55;border-radius:0}

.rank .model-card--rank{grid-row:span 2;width:58px;height:58px;border:0;background:transparent;overflow:hidden;margin:0 0 0 -3px}
.model-card--rank::after{display:none}

.model-hint{position:absolute;z-index:1;bottom:12px;left:16px;font:11px/1.5 var(--f-sans);letter-spacing:.08em;color:#dce7ffb3;pointer-events:none}
@media(prefers-reduced-motion:reduce){.model-hint{display:none}}