/* 课件总馆 · 雾蓝灰 —— bento 概览 + 瑞士网格目录 */
:root{
  --bg-hi:#C3CBD2; --bg:#B4BEC6; --bg-lo:#A6B1BA;
  --ink:#1E2329; --ink-2:#343D46; --ink-3:#4C5660;
  --accent:#3E5C76; --accent-ink:#F4F7FA;
  --phys:#424C8A; --chem:#9A4F22; --bio:#4C6A2E; --geo:#82610F;
  --phys-t:#3A4570; --chem-t:#7E3F18; --bio-t:#3E5A22; --geo-t:#6B4F08; --accent-deep:#2C4560;
  --glass:rgba(250,252,253,.46); --glass-2:rgba(250,252,253,.62); --glass-3:rgba(250,252,253,.78);
  --line:rgba(255,255,255,.62); --line-2:rgba(30,35,41,.10);
  --shadow:0 1px 0 rgba(255,255,255,.55) inset,0 1px 2px rgba(22,30,40,.06),0 8px 24px -10px rgba(22,30,40,.20),0 24px 48px -28px rgba(22,30,40,.28);
  --shadow-hi:0 1px 0 rgba(255,255,255,.7) inset,0 2px 4px rgba(22,30,40,.07),0 18px 38px -14px rgba(22,30,40,.30),0 40px 70px -36px rgba(22,30,40,.36);
  --gap:20px; --r:24px; --pad-in:10px; --r-in:14px; --pad:24px;
  --serif:'KJ Serif','Noto Serif SC','Source Han Serif SC','Songti SC','STSong','SimSun',serif;
  --sans:'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei UI','Microsoft YaHei','Noto Sans SC','Noto Sans CJK SC','Source Han Sans SC',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'KJ Mono','SF Mono',ui-monospace,'JetBrains Mono',Menlo,Consolas,monospace;
  --ease:cubic-bezier(.2,.8,.2,1);
  --top-h:68px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--top-h) + 16px)}
body{margin:0;min-height:100vh;color:var(--ink);font:15px/1.6 var(--sans);letter-spacing:.01em;
  background:
    radial-gradient(1200px 700px at 12% -10%,rgba(236,241,245,.75),transparent 60%),
    radial-gradient(900px 600px at 100% 30%,rgba(150,168,184,.45),transparent 60%),
    linear-gradient(165deg,var(--bg-hi) 0%,var(--bg) 45%,var(--bg-lo) 100%);
  background-attachment:fixed;-webkit-font-smoothing:antialiased}
.grain{position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.32;mix-blend-mode:soft-light;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .9 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
body.v-open{overflow:hidden}
a{color:inherit}
button{font:inherit;color:inherit}
svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.glass{background:var(--glass);-webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line);box-shadow:var(--shadow)}

/* ---------- 顶栏 ---------- */
.topbar{position:sticky;top:0;z-index:30;height:var(--top-h);
  background:rgba(206,214,221,.80);-webkit-backdrop-filter:blur(20px) saturate(150%);backdrop-filter:blur(20px) saturate(150%);
  border-bottom:1px solid rgba(255,255,255,.5);box-shadow:0 1px 0 var(--line-2),0 10px 30px -24px rgba(22,30,40,.5)}
.topbar-in{max-width:1400px;margin:0 auto;height:100%;padding:0 32px;display:grid;grid-template-columns:260px 1fr auto;align-items:center;gap:var(--gap)}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.brand-mark{width:36px;height:36px;border-radius:11px;background:var(--accent);display:grid;grid-template-columns:1fr 1fr;grid-template-rows:3fr 2fr 2fr;gap:3px;padding:8px;box-shadow:0 1px 0 rgba(255,255,255,.3) inset,0 6px 14px -6px rgba(30,50,70,.6)}
.brand-mark i{display:block;border-radius:2.5px;background:#F4F7FA}
.brand-mark i:nth-child(1){grid-row:1 / span 2}
.brand-mark i:nth-child(3){grid-column:2;grid-row:2 / span 2;opacity:.55}
.brand-mark i:nth-child(4){grid-column:1;grid-row:3}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text b{font:600 21px/1.1 var(--serif);letter-spacing:.06em}
.brand-text small{font-size:12px;color:var(--ink-2);letter-spacing:.08em;margin-top:3px}
.search{justify-self:center;width:min(560px,100%);height:44px;display:flex;align-items:center;gap:10px;padding:0 10px 0 16px;border-radius:14px;
  background:rgba(250,252,253,.6);border:1px solid rgba(255,255,255,.75);box-shadow:0 1px 2px rgba(22,30,40,.06) inset,0 0 0 1px var(--line-2);transition:background .2s,box-shadow .2s}
.search:focus-within{background:rgba(255,255,255,.88);box-shadow:0 0 0 3px rgba(62,92,118,.22),0 0 0 1px var(--accent)}
.search svg{color:var(--ink-3)}
.search input{flex:1;min-width:0;border:0;background:none;outline:none;font:15px var(--sans);color:var(--ink)}
.search input::placeholder{color:#505B66}
.search input::-webkit-search-cancel-button{opacity:.6}
.search kbd{font:500 12px var(--mono);color:var(--ink-2);border:1px solid var(--line-2);background:rgba(255,255,255,.6);border-radius:6px;padding:1px 7px}
.fav-toggle{display:flex;align-items:center;gap:8px;height:44px;padding:0 16px 0 14px;border-radius:14px;cursor:pointer;
  background:rgba(250,252,253,.5);border:1px solid rgba(255,255,255,.7);box-shadow:0 0 0 1px var(--line-2);transition:all .2s var(--ease)}
.fav-toggle:hover{background:rgba(255,255,255,.75)}
.fav-toggle em{font:500 12px var(--mono);font-style:normal;min-width:22px;text-align:center;padding:1px 6px;border-radius:8px;background:rgba(30,35,41,.08)}
.fav-toggle[aria-pressed=true]{background:var(--accent);color:var(--accent-ink);border-color:transparent;box-shadow:0 8px 18px -8px rgba(30,50,70,.6)}
.fav-toggle[aria-pressed=true] svg{fill:currentColor}
.fav-toggle[aria-pressed=true] em{background:rgba(255,255,255,.2)}

/* ---------- 布局 ---------- */
.wrap{position:relative;z-index:1;max-width:1400px;margin:0 auto;padding:28px 32px 40px}

/* ---------- Bento 概览 ---------- */
.bento{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:186px;gap:var(--gap);margin-bottom:56px}
.tile{position:relative;border-radius:var(--r);overflow:hidden;padding:var(--pad);
  background:var(--glass);-webkit-backdrop-filter:blur(18px) saturate(140%);backdrop-filter:blur(18px) saturate(140%);
  border:1px solid var(--line);box-shadow:var(--shadow)}
.tile-label{display:flex;align-items:center;gap:8px;font-size:12.5px;letter-spacing:.14em;color:var(--ink-2);font-weight:600}
.tile-label::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent)}
.feature{grid-column:span 2;grid-row:span 2;padding:var(--pad-in);cursor:pointer;display:block;text-decoration:none}
.feature .f-media{position:absolute;inset:var(--pad-in);border-radius:var(--r-in);overflow:hidden;background:#DCE3E9}
.feature .f-media img{position:absolute;inset:-5%;width:110%;height:110%;object-fit:cover;transform:translate3d(var(--px,0),var(--py,0),0);transition:transform .9s var(--ease)}
.feature .f-media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,28,36,0) 40%,rgba(20,28,36,.06) 60%,rgba(20,28,36,.28) 100%)}
.f-card{position:absolute;left:calc(var(--pad-in) + 16px);bottom:calc(var(--pad-in) + 16px);right:calc(var(--pad-in) + 16px);max-width:430px;
  padding:16px 20px 16px;border-radius:calc(var(--r-in) - 2px);background:rgba(246,249,251,.80);-webkit-backdrop-filter:blur(16px) saturate(150%);backdrop-filter:blur(16px) saturate(150%);
  border:1px solid rgba(255,255,255,.8);box-shadow:0 12px 30px -16px rgba(20,30,40,.45)}
.f-kicker{display:flex;align-items:center;gap:10px;font-size:12.5px;color:var(--ink-2);letter-spacing:.1em;font-weight:600}
.f-kicker .no{font:500 12px var(--mono);letter-spacing:.04em;color:var(--ink-3)}
.f-title{font:600 28px/1.25 var(--serif);margin:8px 0 6px;letter-spacing:.02em}
.f-q{margin:0;color:var(--ink-2);font-size:14.5px;line-height:1.6}
.f-go{display:inline-flex;align-items:center;gap:6px;margin-top:12px;font-weight:600;font-size:14px;color:var(--accent)}
.f-go svg{width:16px;height:16px;transition:transform .3s var(--ease)}
.feature:hover .f-go svg{transform:translateX(4px)}
.stats{grid-row:span 2;display:flex;flex-direction:column}
.stats .big{display:flex;align-items:baseline;gap:10px;margin:14px 0 2px}
.stats .big b{font:500 88px/0.9 var(--mono);letter-spacing:-.06em}
.stats .big span{font:600 17px var(--serif);color:var(--ink-2)}
.stats .sub{font-size:13px;color:var(--ink-2);margin:6px 0 0}
.stats ul{list-style:none;margin:auto 0 0;padding:0;display:grid;gap:11px}
.stats li{display:grid;grid-template-columns:44px 1fr 28px;align-items:center;gap:10px;font-size:14px;cursor:pointer;border-radius:8px}
.stats li:hover .bar i{filter:brightness(1.15)}
.stats .bar{height:6px;border-radius:4px;background:rgba(30,35,41,.08);overflow:hidden}
.stats .bar i{display:block;height:100%;border-radius:4px;background:var(--c);transform-origin:left;animation:grow 1.1s var(--ease) both}
.stats li b{font:500 13px var(--mono);text-align:right}
@keyframes grow{from{transform:scaleX(0)}}
.cont,.rand{cursor:pointer;display:flex;flex-direction:column;text-decoration:none;transition:transform .35s var(--ease),box-shadow .35s var(--ease)}
.cont:hover,.rand:hover{transform:translateY(-3px);box-shadow:var(--shadow-hi)}
.cont .c-row{margin-top:auto;display:flex;gap:12px;align-items:center}
.cont .c-row img{width:86px;aspect-ratio:16/9;object-fit:cover;border-radius:10px;flex:none;box-shadow:0 0 0 1px rgba(255,255,255,.7),0 4px 10px -4px rgba(20,30,40,.35)}
.cont .c-title{font:600 17px/1.3 var(--serif);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.cont .c-meta{font-size:12.5px;color:var(--ink-2);margin-top:2px}
.cont.none .c-empty{margin-top:auto;font-size:14px;color:var(--ink-2);line-height:1.55}
.cont.none .c-empty b{display:block;font:600 17px var(--serif);color:var(--ink);margin-bottom:2px}
.rand{background:linear-gradient(150deg,rgba(62,92,118,.94),rgba(44,68,90,.96));color:var(--accent-ink);border-color:rgba(255,255,255,.22)}
.rand .tile-label{color:rgba(244,247,250,.86)}
.rand .tile-label::before{background:#F4F7FA}
.rand .r-body{margin-top:auto;display:flex;align-items:flex-end;justify-content:space-between;gap:10px}
.rand .r-body b{display:block;font:600 22px/1.25 var(--serif)}
.rand .r-body span{font-size:13px;color:rgba(244,247,250,.84)}
.dice{width:52px;height:52px;border-radius:14px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);display:grid;grid-template-columns:repeat(3,1fr);padding:9px;gap:3px;flex:none;transition:transform .6s var(--ease)}
.dice i{width:6px;height:6px;border-radius:50%;background:#F4F7FA;justify-self:center;align-self:center;opacity:0}
.dice i:nth-child(1),.dice i:nth-child(3),.dice i:nth-child(5),.dice i:nth-child(7),.dice i:nth-child(9){opacity:1}
.rand:hover .dice{transform:rotate(90deg)}

/* ---------- 浏览区 ---------- */
.browse{display:grid;grid-template-columns:212px 1fr;gap:40px;align-items:start}
.rail{position:sticky;top:calc(var(--top-h) + 24px);display:grid;gap:26px;max-height:calc(100vh - var(--top-h) - 48px);overflow:auto;padding:2px 4px 8px 2px;scrollbar-width:none}
.rail::-webkit-scrollbar{display:none}
.facet h3{margin:0 0 10px;font:600 12.5px var(--sans);letter-spacing:.16em;color:var(--ink-2);padding-bottom:8px;border-bottom:1px solid rgba(30,35,41,.14)}
.facet .opts{display:grid;gap:3px}
.chip{display:flex;align-items:center;gap:10px;width:100%;text-align:left;padding:7px 10px;border-radius:10px;border:1px solid transparent;background:none;cursor:pointer;font-size:14.5px;color:var(--ink);transition:background .2s,border-color .2s,color .2s}
.chip:hover{background:rgba(250,252,253,.42)}
.chip .dot{width:8px;height:8px;border-radius:50%;background:var(--c,var(--ink-3));flex:none}
.chip .n{margin-left:auto;font:500 12px var(--mono);color:var(--ink-2)}
.chip[aria-pressed=true]{background:var(--glass-3);border-color:rgba(255,255,255,.9);box-shadow:0 1px 2px rgba(22,30,40,.08),0 6px 14px -8px rgba(22,30,40,.3);font-weight:600}
.chip[aria-pressed=true] .n{color:var(--ink)}
.chip.zero{color:#56616B}
.chip.zero .n{color:#56616B}
.rail-note{font-size:12.5px;color:var(--ink-2);line-height:1.6;margin:0}
.rail-note kbd{font:500 11px var(--mono);border:1px solid rgba(30,35,41,.18);border-radius:5px;padding:0 5px;background:rgba(255,255,255,.4)}

.catalog-head{display:flex;align-items:center;justify-content:space-between;min-height:34px;margin:-6px 0 6px}
.result{margin:0;font-size:13.5px;color:var(--ink-2)}
.result b{font:500 14px var(--mono);color:var(--ink)}
.reset{border:0;background:none;color:var(--accent-deep);font-weight:600;font-size:13.5px;cursor:pointer;padding:6px 8px;border-radius:8px}
.reset:hover{background:rgba(250,252,253,.4)}

.group{margin-bottom:52px}
.group[hidden]{display:none}
.g-head{display:grid;grid-template-columns:auto 1fr auto;align-items:end;gap:18px;padding-bottom:14px;margin-bottom:22px;border-bottom:1px solid rgba(30,35,41,.16);position:relative}
.g-head::after{content:"";position:absolute;left:0;bottom:-1px;width:56px;height:2px;background:var(--c)}
.g-head h2{margin:0;font:600 40px/1 var(--serif);letter-spacing:.04em}
.g-head .g-en{font:500 12px var(--mono);letter-spacing:.2em;color:var(--ink-2);padding-bottom:5px;text-transform:uppercase}
.g-head .g-n{font:500 13px var(--mono);color:var(--ink-2);padding-bottom:5px}
.g-head .g-n b{font-size:22px;color:var(--ink);font-weight:500;margin-right:4px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--gap)}

/* 课件卡片 */
.card{position:relative;border-radius:var(--r);padding:var(--pad-in);display:flex;flex-direction:column;
  background:var(--glass);-webkit-backdrop-filter:blur(14px) saturate(140%);backdrop-filter:blur(14px) saturate(140%);
  border:1px solid var(--line);box-shadow:var(--shadow);transition:transform .45s var(--ease),box-shadow .45s var(--ease),background .3s}
.card[hidden]{display:none}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hi);background:var(--glass-2)}
.card .cover{position:relative;aspect-ratio:16/9;border-radius:var(--r-in);overflow:hidden;background:linear-gradient(135deg,#E3E9EE,#CDD6DD)}
.card .cover img{width:100%;height:100%;object-fit:cover;display:block;opacity:0;transform:scale(1.02);transition:opacity .5s,transform .7s var(--ease)}
.card .cover img.ok{opacity:1;transform:none}
.card:hover .cover img.ok{transform:scale(1.035)}
.card .num{position:absolute;left:10px;top:10px;font:500 11.5px var(--mono);letter-spacing:.04em;padding:3px 8px;border-radius:8px;background:rgba(246,249,251,.82);color:var(--ink);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.card .body{padding:14px 8px 6px;display:flex;flex-direction:column;flex:1}
.card .meta{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--ink-2);font-weight:600;letter-spacing:.06em}
.card .meta .dot{width:7px;height:7px;border-radius:50%;background:var(--c)}
.card .meta .subj{color:var(--cx)}
.card h3{margin:7px 0 6px;font:600 19px/1.35 var(--serif);letter-spacing:.02em}
.card h3 a{text-decoration:none}
.card h3 a::after{content:"";position:absolute;inset:0;border-radius:var(--r);z-index:1}
.card .q{margin:0;color:var(--ink-2);font-size:13.5px;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:3.2em;margin-bottom:14px}
.card .cfoot{display:flex;align-items:center;gap:8px;margin-top:auto;padding-top:12px;border-top:1px solid rgba(30,35,41,.09)}
.tag{font:500 11.5px var(--mono);letter-spacing:.02em;padding:3px 8px;border-radius:7px;background:rgba(30,35,41,.07);color:var(--ink-2);white-space:nowrap}
.tag.nsteps{background:none;padding-left:0;color:var(--ink-2)}
.tag.nsteps b{color:var(--ink);font-weight:600}
.tag.tb{font-family:var(--sans);font-weight:600;letter-spacing:.04em}
.card .cfoot .more{margin-left:auto;font-size:12.5px;color:var(--accent);font-weight:600;opacity:0;transform:translateX(-4px);transition:all .3s var(--ease)}
.card:hover .cfoot .more{opacity:1;transform:none}
.star{position:absolute;z-index:2;right:8px;top:8px;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;cursor:pointer;
  background:rgba(246,249,251,.78);border:1px solid rgba(255,255,255,.9);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:var(--ink-2);
  box-shadow:0 4px 10px -4px rgba(20,30,40,.35);transition:transform .25s var(--ease),background .2s,color .2s}
.star svg{width:17px;height:17px}
.star:hover{transform:scale(1.08);color:var(--ink)}
.star[aria-pressed=true]{background:var(--accent);color:#F4F7FA;border-color:transparent}
.star[aria-pressed=true] svg{fill:currentColor}
.star.pop{animation:pop .4s var(--ease)}
@keyframes pop{40%{transform:scale(1.25)}}
mark{background:rgba(62,92,118,.18);color:inherit;border-radius:3px;padding:0 1px}
.empty{display:grid;justify-items:start;gap:4px;padding:40px 32px;border-radius:var(--r);background:var(--glass);border:1px dashed rgba(30,35,41,.2)}
.empty b{font:600 22px var(--serif)}
.empty span{color:var(--ink-2)}

/* ---------- 页脚 ---------- */
.foot{position:relative;z-index:1;border-top:1px solid rgba(30,35,41,.12);background:rgba(214,221,227,.28)}
.foot-in{max-width:1400px;margin:0 auto;padding:22px 32px 28px;display:flex;flex-wrap:wrap;gap:6px 24px;justify-content:space-between;font-size:13px;color:var(--ink-2)}
.foot p{margin:0}
.foot a{color:var(--accent-deep);font-weight:600;text-underline-offset:3px}
.noscript{position:relative;z-index:2;text-align:center;padding:20px}

/* ---------- 查看器 ---------- */
.viewer{position:fixed;inset:0;z-index:100}
.viewer[hidden]{display:none}
.v-scrim{position:absolute;inset:0;background:rgba(170,182,192,.72);-webkit-backdrop-filter:blur(26px) saturate(120%);backdrop-filter:blur(26px) saturate(120%);opacity:0;transition:opacity .35s var(--ease)}
.viewer.in .v-scrim{opacity:1}
.v-shell{position:absolute;inset:0;display:grid;grid-template-columns:minmax(0,1fr) 360px;grid-template-rows:minmax(0,1fr) auto;
  grid-template-areas:"stage drawer" "bar bar";gap:16px;padding:20px;transition:grid-template-columns .45s var(--ease)}
.v-shell.nodrawer{grid-template-columns:minmax(0,1fr) 0px}
.v-mhead{display:none}
.v-shell:focus{outline:none}
.v-stagewrap{grid-area:stage;container-type:size;display:grid;place-items:center;min-height:0}
.v-stage{position:relative;width:min(100cqw,calc(100cqh * 16 / 9));aspect-ratio:16/9;border-radius:var(--r-in);overflow:hidden;background:#0E1318;
  box-shadow:0 0 0 1px rgba(255,255,255,.5),0 30px 60px -30px rgba(20,30,40,.6),0 10px 24px -12px rgba(20,30,40,.4);opacity:0;transition:opacity .3s}
.viewer.in .v-stage{opacity:1}
.viewer.zooming .v-stage{opacity:0;transition:none}
.v-stage:fullscreen{border-radius:0;width:100vw;height:100vh}
.v-stage iframe{position:absolute;inset:0;width:100%;height:100%;border:0;background:#0E1318;opacity:0;transition:opacity .45s}
.v-stage.loaded iframe{opacity:1}
.v-poster{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:opacity .5s}
.v-stage.loaded .v-poster{opacity:0}
.v-loading{position:absolute;left:50%;bottom:18px;transform:translateX(-50%);display:flex;align-items:center;gap:10px;font-size:13px;color:var(--ink);padding:7px 14px 7px 10px;border-radius:20px;background:rgba(246,249,251,.85);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);transition:opacity .3s}
.v-loading span{width:14px;height:14px;border-radius:50%;border:2px solid rgba(62,92,118,.25);border-top-color:var(--accent);animation:spin .8s linear infinite}
.v-stage.loaded .v-loading{opacity:0;pointer-events:none;visibility:hidden}
.v-stage.loaded .v-loading span{animation:none}
@keyframes spin{to{transform:rotate(360deg)}}
.v-drawer{grid-area:drawer;min-width:0;overflow:hidden;border-radius:var(--r);background:var(--glass-2);-webkit-backdrop-filter:blur(20px) saturate(140%);backdrop-filter:blur(20px) saturate(140%);
  border:1px solid var(--line);box-shadow:var(--shadow);transition:opacity .3s,transform .45s var(--ease);opacity:0;transform:translateX(24px)}
.viewer.in .v-drawer{opacity:1;transform:none}
.v-shell.nodrawer .v-drawer{opacity:0;pointer-events:none;border-width:0}
.v-handle{display:none}
.v-drawer-in{height:100%;overflow:auto;padding:24px 22px 22px;width:360px;scrollbar-width:thin;scrollbar-color:rgba(30,35,41,.2) transparent}
.d-kicker{display:flex;align-items:center;gap:8px;font-size:12.5px;font-weight:600;letter-spacing:.08em;color:var(--ink-2)}
.d-kicker .dot{width:7px;height:7px;border-radius:50%;background:var(--c)}
.d-kicker .subj{color:var(--cx)}
.d-title{font:600 25px/1.3 var(--serif);margin:8px 0 12px}
.d-q{margin:0 0 22px;padding:14px 16px;border-radius:var(--r-in);background:rgba(255,255,255,.55);border:1px solid rgba(255,255,255,.85);font:600 15.5px/1.65 var(--serif);color:var(--ink);position:relative}
.d-q::before{content:"导学问题";display:block;font:600 11.5px var(--sans);letter-spacing:.16em;color:var(--accent);margin-bottom:4px}
.d-sec{margin:0 0 22px}
.d-sec h4{margin:0 0 10px;font:600 12px var(--sans);letter-spacing:.16em;color:var(--ink-2);display:flex;align-items:center;gap:8px}
.d-sec h4 em{font:500 11.5px var(--mono);font-style:normal;color:var(--ink-2)}
.d-sec h4::after{content:"";flex:1;height:1px;background:rgba(30,35,41,.12)}
.steps{list-style:none;margin:0;padding:0;display:grid;gap:2px;counter-reset:s}
.steps li{display:grid;grid-template-columns:30px 1fr;align-items:baseline;font-size:14px;padding:5px 0;line-height:1.5}
.steps li::before{counter-increment:s;content:counter(s,decimal-leading-zero);font:500 12px var(--mono);color:var(--accent)}
.tbs{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.tbs li{font-size:13px;line-height:1.6;color:var(--ink-2);padding-left:12px;border-left:2px solid rgba(62,92,118,.35)}
.tbs li b{color:var(--ink);font-weight:600}
.rel{display:grid;gap:6px}
.rel a{display:grid;grid-template-columns:64px 1fr;gap:10px;align-items:center;text-decoration:none;padding:6px;border-radius:12px;transition:background .2s}
.rel a:hover{background:rgba(255,255,255,.55)}
.rel img{width:64px;aspect-ratio:16/9;object-fit:cover;border-radius:7px;box-shadow:0 0 0 1px rgba(255,255,255,.8)}
.rel b{font:600 14px/1.35 var(--serif)}
.rel span{display:block;font-size:12px;color:var(--ink-2);margin-top:1px}
.d-credit{margin:6px 0 0;padding-top:14px;border-top:1px solid rgba(30,35,41,.12);font-size:12px;line-height:1.7;color:var(--ink-2)}
.d-credit a{color:var(--accent);font-weight:600}
.v-bar{grid-area:bar;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;height:60px;padding:0 10px 0 20px;border-radius:18px;
  background:var(--glass-2);-webkit-backdrop-filter:blur(20px) saturate(140%);backdrop-filter:blur(20px) saturate(140%);border:1px solid var(--line);box-shadow:var(--shadow);
  opacity:0;transform:translateY(16px);transition:opacity .3s,transform .45s var(--ease)}
.viewer.in .v-bar{opacity:1;transform:none}
.v-bar-title{display:flex;align-items:baseline;gap:10px;min-width:0}
.v-bar-title em{font:500 12px var(--mono);font-style:normal;color:var(--ink-2)}
.v-bar-title b{font:600 17px var(--serif);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.v-bar-nav{display:flex;align-items:center;gap:10px}
.v-pos{font:500 12.5px var(--mono);color:var(--ink-2);min-width:58px;text-align:center}
.v-bar-tools{display:flex;justify-content:flex-end;gap:4px}
.btn{display:inline-flex;align-items:center;gap:6px;height:40px;padding:0 14px;border-radius:12px;border:1px solid rgba(255,255,255,.8);background:rgba(255,255,255,.55);cursor:pointer;font-size:14px;font-weight:600;box-shadow:0 1px 2px rgba(22,30,40,.08);transition:background .2s,transform .2s}
.btn:hover{background:rgba(255,255,255,.85)}
.btn:active{transform:scale(.97)}
.btn svg{width:17px;height:17px}
.icon-btn{width:40px;height:40px;display:grid;place-items:center;border-radius:12px;border:0;background:none;cursor:pointer;color:var(--ink);text-decoration:none;transition:background .2s}
.icon-btn:hover{background:rgba(255,255,255,.6)}
.icon-btn[aria-pressed=true]{background:rgba(62,92,118,.14);color:var(--accent)}
.icon-btn.close{background:var(--ink);color:#F4F7FA;margin-left:6px}
.icon-btn.close:hover{background:#000}
.zoom-ghost{position:fixed;z-index:200;object-fit:cover;pointer-events:none;border-radius:var(--r-in);box-shadow:0 30px 60px -20px rgba(20,30,40,.5);will-change:transform}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .bento{grid-template-columns:repeat(3,1fr)}
  .feature{grid-column:span 2}
  .stats{grid-row:span 2}
  .cont,.rand{grid-column:span 1}
  .bento .cont{grid-column:1 / span 2}
  .v-shell{grid-template-columns:minmax(0,1fr) 320px}
  .v-drawer-in{width:320px}
}
@media (max-width:860px){
  .topbar-in{grid-template-columns:auto 1fr auto;padding:0 20px}
  .brand-text small{display:none}
  .wrap{padding:22px 20px 32px}
  .browse{grid-template-columns:1fr;gap:20px}
  .rail{position:sticky;top:var(--top-h);z-index:5;display:flex;gap:6px;overflow-x:auto;max-height:none;margin:0 -20px;padding:10px 20px;
    background:rgba(190,200,208,.72);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid rgba(255,255,255,.4)}
  .facet{display:flex;align-items:center;gap:6px;flex:none}
  .facet h3{display:none}
  .facet + .facet{padding-left:8px;border-left:1px solid rgba(30,35,41,.16)}
  .facet .opts{display:flex;gap:6px}
  .chip{width:auto;white-space:nowrap;padding:6px 12px;border-radius:20px;background:rgba(250,252,253,.42);border-color:rgba(255,255,255,.6);font-size:13.5px}
  .chip .n{margin-left:2px}
  .rail-note{display:none}
  .v-shell{grid-template-columns:1fr;grid-template-rows:auto minmax(0,1fr) auto;grid-template-areas:"stage" "drawer" "bar"}
  .v-shell.nodrawer{grid-template-columns:1fr}
  .v-stagewrap{container-type:inline-size}
  .v-stage{width:100%}
  .v-drawer-in{width:auto}
  .v-drawer{transform:translateY(24px)}
}
@media (max-width:600px){
  :root{--gap:14px;--r:20px;--pad:18px;--pad-in:8px;--r-in:12px;--top-h:112px}
  .topbar{background:rgba(206,214,221,.94)}
  .topbar-in{grid-template-columns:1fr auto;grid-template-rows:56px 44px;padding:0 16px 10px;gap:0 10px}
  .search{grid-column:1 / -1;grid-row:2;width:100%}
  .search kbd{display:none}
  .fav-toggle{height:38px;padding:0 12px}
  .brand-mark{width:32px;height:32px;border-radius:10px;padding:7px}
  .brand-text b{font-size:19px}
  .wrap{padding:16px 16px 28px}
  .rail{margin:0 -16px;padding:10px 16px}
  .bento{grid-template-columns:repeat(2,1fr);grid-auto-rows:auto;margin-bottom:28px}
  .feature{grid-column:span 2;grid-row:auto;aspect-ratio:auto;padding:var(--pad-in)}
  .feature .f-media{position:relative;inset:auto;aspect-ratio:16/9}
  .feature .f-media img{inset:0;width:100%;height:100%}
  .f-card{position:relative;left:auto;right:auto;bottom:auto;margin:10px 4px 4px;padding:6px 6px 8px;background:none;border:0;box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;max-width:none}
  .f-title{font-size:23px}
  .stats{grid-column:span 2;grid-row:auto}
  .stats .big{margin:8px 0 0}
  .stats .big b{font-size:60px}
  .stats ul{margin-top:16px;grid-template-columns:1fr 1fr;gap:10px 18px}
  .stats li{grid-template-columns:34px 1fr 22px;gap:8px;font-size:13.5px}
  .bento .cont{grid-column:span 1;min-height:168px}
  .rand{min-height:168px}
  .cont .c-row{flex-direction:column;align-items:flex-start;gap:8px}
  .cont .c-row img{width:100%}
  .cont .c-title{font-size:15px}
  .cont.none .c-empty{font-size:13px}
  .cont.none .c-empty b{font-size:15px}
  .rand .r-body{flex-direction:column;align-items:flex-start}
  .dice{width:44px;height:44px;padding:7px;position:absolute;right:16px;top:14px}
  .rand .r-body b{font-size:19px}
  .g-head{grid-template-columns:auto 1fr auto;gap:10px;margin-bottom:16px}
  .g-head h2{font-size:30px}
  .grid{grid-template-columns:1fr;gap:12px}
  .card{flex-direction:row;gap:12px;align-items:stretch}
  .card .cover{width:42%;flex:none;align-self:flex-start}
  .card .num{left:6px;top:6px;font-size:10.5px;padding:2px 6px}
  .card .body{padding:2px 2px 2px 0;min-width:0}
  .card .meta{font-size:11.5px}
  .card h3{font-size:16px;margin:4px 0 3px}
  .card .q{font-size:12.5px;min-height:0;margin-bottom:8px}
  .card .cfoot{margin-top:auto;padding-top:8px;border-top:0}
  .card .cfoot .more{display:none}
  .star{width:28px;height:28px;right:5px;top:5px}
  .star svg{width:15px;height:15px}
  .card:hover{transform:none}
  .foot-in{padding:18px 16px 24px}
  /* 查看器：舞台全宽，信息栏为底部抽屉 */
  .v-shell{padding:0;gap:0;grid-template-rows:auto auto minmax(0,1fr) auto;grid-template-areas:"mhead" "stage" "drawer" "bar"}
  .v-mhead{grid-area:mhead;display:flex;align-items:center;justify-content:space-between;gap:8px;height:52px;padding:0 6px 0 16px;background:rgba(214,221,227,.7);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}
  .v-mtitle{font:600 16px var(--serif);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .v-stage{border-radius:0;box-shadow:none}
  .v-drawer{position:relative;margin-top:0;border-radius:20px 20px 0 0;border-bottom:0;background:rgba(240,244,247,.86);z-index:3;transition:margin .45s var(--ease),opacity .3s,transform .45s var(--ease)}
  .v-shell.sheet-up .v-drawer{margin-top:-56.25vw}
  .v-shell.nodrawer .v-drawer{opacity:1;pointer-events:auto;border-width:1px}
  .v-handle{display:block;position:sticky;top:0;width:100%;height:24px;border:0;background:none;cursor:pointer;padding:0}
  .v-handle i{display:block;width:40px;height:5px;margin:9px auto 0;border-radius:3px;background:rgba(30,35,41,.25)}
  .v-drawer-in{height:calc(100% - 24px);padding:4px 18px 18px}
  .d-title{font-size:21px}
  .v-bar{height:auto;grid-template-columns:1fr auto;border-radius:0;padding:8px 10px calc(8px + env(safe-area-inset-bottom));gap:8px;border-left:0;border-right:0;border-bottom:0;background:rgba(232,237,241,.92)}
  .v-bar-title{display:none}
  .v-bar-nav{gap:4px}
  .btn{padding:0 10px;font-size:13px}
  .v-pos{min-width:46px;font-size:11.5px}
  .v-bar-tools .close,[data-act=drawer]{display:none}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
}
/* 不支持毛玻璃的浏览器：改用更实的底色，保证文字可读 */
@supports not ((backdrop-filter:blur(2px)) or (-webkit-backdrop-filter:blur(2px))){
  .topbar{background:rgba(208,215,221,.97)}
  .tile,.card,.v-drawer,.v-bar{background:rgba(222,228,232,.92)}
  .rand{background:linear-gradient(150deg,#3E5C76,#2C445A)}
  .v-scrim{background:rgba(170,182,192,.97)}
  .f-card{background:rgba(246,249,251,.95)}
}