/* SDSZ 脑科学社 — official site
   Black stage, neural field, serif italics, liquid glass. */

:root{
  --bg:#050506;
  --bg-2:#08090b;
  --fg:#f6f7f8;
  --muted:#a2a7ad;
  --dim:#71767c;
  --line:rgba(255,255,255,.12);
  --line-strong:rgba(255,255,255,.22);
  --card:rgba(255,255,255,.028);
  --teal:#40beaf;
  --amber:#fbbf24;
  --pink:#ec7096;
  --violet:#9687eb;
  --blue:#78a0f0;
  --warm:#f0785a;
  --mint:#78e6c8;
  --sans:Inter,"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --serif:"Instrument Serif","Noto Serif SC","Songti SC","Times New Roman",serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Noto Sans SC",monospace;
  --brain-glyph:inline-block;
  --r:18px;
  color-scheme:dark;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg);scroll-padding-top:86px}
body{
  margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);
  font-size:16px;line-height:1.65;overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font:inherit;color:inherit}
[hidden]{display:none!important}
:focus-visible{outline:2px solid #fff;outline-offset:3px;border-radius:8px}
::selection{background:rgba(64,190,175,.32)}

.serif{font-family:var(--serif);font-style:italic;font-weight:400}
.px{padding-inline:clamp(20px,6vw,112px)}
.wrap{max-width:1240px;margin-inline:auto}
.eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--dim)}
.muted{color:var(--muted)}

/* ---------------- header ---------------- */
.site-head{position:fixed;inset-inline:0;top:0;z-index:60;transition:background .35s ease,border-color .35s ease,backdrop-filter .35s ease;border-bottom:1px solid transparent}
.site-head.is-stuck{background:rgba(5,5,6,.78);backdrop-filter:blur(16px) saturate(140%);-webkit-backdrop-filter:blur(16px) saturate(140%);border-bottom-color:var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:18px;height:72px}
.bar-left{display:flex;align-items:center;gap:28px;min-width:0}
.logo{display:flex;align-items:center;gap:10px;font-weight:600;letter-spacing:.01em;white-space:nowrap}
.mark{width:30px;height:30px;flex:none;display:grid;place-items:center}
.mark svg{width:100%;height:100%;overflow:visible}
.logo em{font-family:var(--serif);font-style:italic;font-weight:400;color:var(--muted);font-size:.95em}
.nav{display:flex;align-items:center;gap:22px;font-size:.92rem;color:var(--muted)}
.nav a,.nav button{color:inherit;background:none;border:0;padding:0;cursor:pointer;transition:color .2s}
.nav a:hover,.nav button:hover,.nav a[aria-current="true"]{color:var(--fg)}
.drop{position:relative}
.drop-btn{display:inline-flex;align-items:center;gap:5px}
.chev{width:13px;height:13px;transition:transform .25s}
.drop[data-open="true"] .chev{transform:rotate(180deg)}
.menu{position:absolute;top:calc(100% + 14px);left:-16px;min-width:220px;padding:10px;border-radius:14px;
  background:rgba(14,15,17,.94);border:1px solid var(--line);backdrop-filter:blur(18px);
  display:grid;gap:2px;box-shadow:0 24px 60px rgba(0,0,0,.6)}
.menu a{padding:9px 12px;border-radius:9px;font-size:.9rem}
.menu a:hover{background:rgba(255,255,255,.07);color:#fff}
.head-cta{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:999px;background:#fff;color:#08090b;font-weight:600;font-size:.88rem;white-space:nowrap;transition:transform .2s,box-shadow .2s}
.head-cta:hover{transform:translateY(-1px);box-shadow:0 10px 30px rgba(255,255,255,.16)}
.burger{display:none;width:40px;height:40px;border-radius:11px;border:1px solid var(--line);background:rgba(255,255,255,.04);cursor:pointer;padding:0;place-items:center}
.burger span{display:block;width:16px;height:1.5px;background:#fff;margin:3px auto;transition:transform .25s,opacity .25s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}

.mobile-nav{position:fixed;inset:72px 12px auto 12px;z-index:59;padding:14px;border-radius:18px;border:1px solid var(--line);
  background:rgba(10,11,13,.96);backdrop-filter:blur(18px);display:grid;gap:4px;box-shadow:0 30px 70px rgba(0,0,0,.7)}
.mobile-nav a{padding:12px 14px;border-radius:11px;color:var(--muted)}
.mobile-nav a:hover{background:rgba(255,255,255,.06);color:#fff}

/* ---------------- hero ---------------- */
.hero{position:relative;min-height:100svh;padding-top:132px;padding-bottom:72px;display:flex;align-items:center;overflow:hidden;isolation:isolate}
#neurons{position:absolute;inset:0;width:100%;height:100%;z-index:0;opacity:.85}
.hero::before{content:"";position:absolute;inset:0;z-index:0;
  background:radial-gradient(700px 420px at 26% 30%,rgba(64,190,175,.16),transparent 70%),
             radial-gradient(620px 380px at 82% 74%,rgba(150,135,235,.15),transparent 72%);}
.hero::after{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(180deg,rgba(5,5,6,.72) 0%,rgba(5,5,6,.38) 32%,rgba(5,5,6,.82) 88%,var(--bg) 100%)}
.hero-inner{position:relative;z-index:2;max-width:1240px;margin-inline:auto;width:100%}
.hero-badge{display:inline-flex;align-items:center;gap:10px;padding:7px 14px;border-radius:999px;border:1px solid var(--line);
  background:rgba(255,255,255,.04);font-family:var(--mono);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.live{width:7px;height:7px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 4px rgba(120,230,200,.14);animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.35;transform:scale(.82)}}
h1{font-size:clamp(2.5rem,6.4vw,5.1rem);line-height:1.03;letter-spacing:-.025em;font-weight:600;margin:26px 0 0;max-width:17ch}
h1 .it{font-family:var(--serif);font-style:italic;font-weight:400;color:#fff;letter-spacing:-.01em}
.slogan{margin:22px 0 0;font-size:clamp(1rem,1.7vw,1.2rem);color:var(--muted);letter-spacing:.01em}
.slogan b{color:var(--fg);font-weight:500}
.glyph{width:17px;height:17px;display:inline-block;vertical-align:-3px;color:var(--mint)}
.slogan .glyph{margin-left:2px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 24px;border-radius:999px;border:1px solid var(--line-strong);
  background:rgba(255,255,255,.05);font-size:.94rem;font-weight:500;transition:background .22s,transform .22s,border-color .22s;cursor:pointer}
.btn:hover{background:rgba(255,255,255,.12);transform:translateY(-1px);border-color:rgba(255,255,255,.34)}
.btn-solid{background:#fff;color:#08090b;border-color:#fff;font-weight:600}
.btn-solid:hover{background:#e9eaec;border-color:#e9eaec;box-shadow:0 14px 34px rgba(255,255,255,.16)}
.btn .arw{transition:transform .22s}
.btn:hover .arw{transform:translateX(3px)}

.bq{margin:52px 0 0;max-width:620px;padding:20px 22px;border-radius:16px;border:1px solid var(--line);
  background:rgba(255,255,255,.035);backdrop-filter:blur(10px);position:relative;overflow:hidden}
.bq::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;pointer-events:none;
  background:linear-gradient(180deg,rgba(255,255,255,.34),transparent 42%,transparent 62%,rgba(255,255,255,.18));
  -webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude}
.bq-k{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-family:var(--mono);font-size:.68rem;letter-spacing:.13em;text-transform:uppercase;color:var(--dim)}
.bq-k b{color:var(--teal);font-weight:500}
#bqText{margin:12px 0 0;font-family:var(--serif);font-style:italic;font-size:clamp(1.02rem,1.7vw,1.24rem);line-height:1.55;color:#eef0f2;min-height:2.6em}
.bq figcaption{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);font-size:.8rem;color:var(--muted)}
.bq-next{border:0;background:none;color:var(--muted);cursor:pointer;font-size:.8rem;padding:4px 0;transition:color .2s}
.bq-next:hover{color:#fff}

.hero-stats{display:flex;flex-wrap:wrap;gap:26px;margin-top:38px;font-family:var(--mono);font-size:.72rem;color:var(--dim);letter-spacing:.06em}
.hero-stats b{display:block;color:var(--fg);font-size:1.02rem;letter-spacing:0;font-weight:500}

/* ---------------- sections ---------------- */
.block{padding-block:clamp(64px,9vw,116px);position:relative}
.block + .block{border-top:1px solid rgba(255,255,255,.055)}
.inner{max-width:1240px;margin-inline:auto}
.h2{margin:0;display:flex;flex-wrap:wrap;align-items:baseline;gap:.55rem;font-size:clamp(1.7rem,3.4vw,2.55rem);font-weight:600;letter-spacing:-.02em}
.h2 .serif{font-size:.6em;color:var(--dim);letter-spacing:0}
.lead{margin:16px 0 0;max-width:62ch;color:var(--muted);font-size:1.02rem}
.lead b{color:#fff;font-weight:500}

/* toc */
.toc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(255px,1fr));gap:14px;margin-top:36px}
.toc-card{position:relative;display:flex;align-items:center;gap:14px;padding:18px;border-radius:16px;border:1px solid var(--line);
  background:linear-gradient(180deg,rgba(255,255,255,.04),rgba(255,255,255,.012));transition:transform .25s,border-color .25s,background .25s}
.toc-card:hover{transform:translateY(-3px);border-color:rgba(var(--c),.5);background:linear-gradient(180deg,rgba(var(--c),.1),rgba(255,255,255,.012))}
.toc-card .ico{width:38px;height:38px;flex:none;border-radius:11px;display:grid;place-items:center;color:rgb(var(--c));background:rgba(var(--c),.12);border:1px solid rgba(var(--c),.28)}
.toc-card .ico svg{width:19px;height:19px}
.toc-txt{display:grid;gap:1px;min-width:0}
.toc-txt b{font-weight:500;font-size:.98rem}
.toc-txt .en{font-family:var(--serif);font-style:italic;color:var(--dim);font-size:.9rem}
.toc-txt small{color:var(--dim);font-size:.76rem;line-height:1.45}
.toc-arrow{margin-left:auto;color:var(--dim);transition:transform .25s,color .25s}
.toc-card:hover .toc-arrow{transform:translateX(3px);color:rgb(var(--c))}

/* quote */
.quote{padding-block:clamp(70px,11vw,140px);border-top:1px solid rgba(255,255,255,.055);position:relative;overflow:hidden}
.quote::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 50% 0%,rgba(150,135,235,.09),transparent 70%)}
.quote-in{max-width:940px;margin-inline:auto;position:relative;text-align:center}
.qmark{font-family:var(--serif);font-size:clamp(3rem,8vw,6rem);line-height:.6;color:rgba(255,255,255,.16)}
.qtext{margin:6px 0 0;font-size:clamp(1.35rem,3vw,2.15rem);line-height:1.5;letter-spacing:-.01em;font-weight:400;color:#f2f4f6}
.qtext .qend{color:var(--dim)}
.author{display:inline-flex;align-items:center;gap:12px;margin-top:34px;text-align:left}
.avatar{width:42px;height:42px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;background:rgba(255,255,255,.05)}
.avatar svg{width:22px;height:22px}
.author b{display:block;font-size:.9rem;font-weight:500}
.author span{display:block;font-size:.76rem;color:var(--dim)}

/* explore */
.ex-toolbar{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px;align-items:center}
.seg{display:inline-flex;padding:3px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.03);gap:2px}
.seg button{border:0;background:none;color:var(--muted);padding:8px 16px;border-radius:999px;font-size:.84rem;cursor:pointer;transition:background .2s,color .2s}
.seg button[aria-selected="true"],.seg button[aria-pressed="true"]{background:rgba(255,255,255,.12);color:#fff}
.seg button:hover{color:#fff}
.ex-grid{display:grid;grid-template-columns:1.35fr .9fr;gap:20px;margin-top:22px;align-items:start}
.ex-stage{position:relative;border-radius:22px;border:1px solid var(--line);background:
  radial-gradient(520px 300px at 50% 40%,rgba(64,190,175,.09),transparent 72%),rgba(255,255,255,.02);
  padding:14px;overflow:hidden}
.ex-svg{width:100%;height:auto;display:block;color:#fff}
.lbls{font-family:var(--sans);pointer-events:none}
.part{fill:rgba(var(--pc),.12);stroke:rgba(255,255,255,.34);stroke-width:1.4;cursor:pointer;transition:fill .22s,stroke .22s,filter .22s}
.part:hover,.part:focus-visible{fill:rgba(var(--pc),.42);stroke:rgb(var(--pc));filter:url(#exGlow)}
.part.is-active{fill:rgba(var(--pc),.55);stroke:rgb(var(--pc))}
.part.tube,.part.tube-g,.part.tube-line{fill:none;stroke:rgba(255,255,255,.4);stroke-width:7;stroke-linecap:round}
.part.tube:hover,.part.tube-g:hover,.part.tube.is-active,.part.tube-g.is-active{stroke:rgb(var(--pc))}
.part.tube-g path{stroke:rgba(255,255,255,.4);stroke-width:3.4;fill:none;transition:stroke .22s}
.part.tube-g:hover path,.part.tube-g.is-active path{stroke:rgb(var(--pc))}
.part.spot{fill:rgba(var(--pc),.3)}
.part.strip{fill:rgba(var(--pc),.3);stroke:none}
.part.strip:hover,.part.strip.is-active{fill:rgb(var(--pc))}
.ex-svg .deco{color:rgba(255,255,255,.5);pointer-events:none}
.l-deep{display:none}
.ex-svg[data-view="deep"] .l-deep{display:block}
.ex-svg[data-view="deep"] .l-surface{display:none}
.ex-svg[data-view="deep"] .deep{display:block}
.ex-svg .deep{display:none}
.ex-svg[data-view="deep"] .lobes{opacity:.25}
.ex-svg .lbls text{fill:rgba(255,255,255,.62);font-size:14px}
.syn-bg{fill:rgba(255,255,255,.04);stroke:rgba(255,255,255,.2);stroke-dasharray:3 4}
.pre{fill:rgba(251,191,36,.14)}
.post{fill:rgba(120,230,200,.12)}
.ves circle{fill:rgba(251,191,36,.8)}
.rec rect{fill:rgba(120,230,200,.65)}
.nt circle{fill:rgba(251,191,36,.9)}

.ex-info{border-radius:20px;border:1px solid var(--line);background:rgba(255,255,255,.025);padding:24px;position:sticky;top:96px;min-height:330px}
.ex-k{font-family:var(--mono);font-size:.68rem;letter-spacing:.15em;text-transform:uppercase;color:var(--teal)}
.ex-info h3{margin:10px 0 2px;font-size:1.42rem;letter-spacing:-.01em;font-weight:600}
.ex-en{font-family:var(--serif);font-style:italic;color:var(--dim);font-size:1rem}
.ex-info p{margin:14px 0 0;color:var(--muted);font-size:.93rem}
.ex-fact{margin-top:16px!important;padding:12px 14px;border-left:2px solid rgba(64,190,175,.6);background:rgba(64,190,175,.08);border-radius:0 10px 10px 0;color:#dfe4e7!important;font-size:.88rem!important}
.chips{display:flex;flex-wrap:wrap;gap:7px;margin-top:18px}
.chip{font-family:var(--mono);font-size:.64rem;letter-spacing:.1em;text-transform:uppercase;color:var(--dim);border:1px solid var(--line);border-radius:999px;padding:4px 9px}

/* news */
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(268px,1fr));gap:14px;margin-top:34px}
.tile{display:grid;gap:8px;padding:20px;border-radius:16px;border:1px solid var(--line);text-align:left;
  background:linear-gradient(180deg,rgba(255,255,255,.045),rgba(255,255,255,.012));transition:transform .25s,border-color .25s,background .25s}
.tile:hover{transform:translateY(-3px);border-color:rgba(var(--c),.45);background:linear-gradient(180deg,rgba(var(--c),.1),rgba(255,255,255,.012))}
.t-no{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:rgb(var(--c))}
.t-no .new{font-style:normal;font-size:.58rem;letter-spacing:.12em;padding:2px 6px;border-radius:5px;background:rgba(var(--c),.18);color:rgb(var(--c))}
.t-ttl{font-size:1.02rem;line-height:1.45;font-weight:500;color:#f2f4f6}
.t-tag{font-size:.76rem;color:var(--dim)}
.note{margin-top:20px;font-size:.8rem;color:var(--dim)}

/* learn */
.books{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:18px;margin-top:34px}
.book{display:grid;grid-template-columns:112px 1fr;gap:18px;padding:20px;border-radius:18px;border:1px solid var(--line);background:rgba(255,255,255,.025)}
.cover{aspect-ratio:3/4;border-radius:10px;border:1px solid rgba(255,255,255,.16);display:flex;align-items:center;justify-content:center;
  padding:10px;text-align:center;font-family:var(--serif);font-style:italic;font-size:1.1rem;line-height:1.25;color:#fff;
  background:linear-gradient(160deg,rgba(64,190,175,.5),rgba(20,22,26,.9) 60%);box-shadow:inset 0 0 30px rgba(0,0,0,.5)}
.cover--2{background:linear-gradient(160deg,rgba(150,135,235,.55),rgba(20,22,26,.9) 62%)}
.meta{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}
.meta span{font-family:var(--mono);font-size:.62rem;letter-spacing:.08em;padding:3px 7px;border-radius:5px;border:1px solid var(--line);color:var(--muted)}
.meta .free{background:rgba(120,230,200,.14);border-color:rgba(120,230,200,.35);color:var(--mint)}
.book h3{margin:0;font-size:1.06rem;font-weight:600}
.book h3 small{display:block;margin-top:5px;font-size:.74rem;font-weight:400;color:var(--dim);line-height:1.5}
.book .one{margin:10px 0 0;font-size:.88rem;color:var(--muted)}
details.toc-d{margin-top:14px;border-top:1px solid var(--line);padding-top:12px}
details.toc-d summary{cursor:pointer;font-size:.82rem;color:var(--muted);list-style:none;display:flex;align-items:center;gap:8px}
details.toc-d summary::-webkit-details-marker{display:none}
details.toc-d summary::before{content:"+";font-family:var(--mono);color:var(--dim);width:10px}
details.toc-d[open] summary::before{content:"−"}
details.toc-d summary:hover{color:#fff}
.tips{display:grid;gap:8px;margin:14px 0 0}
.tips div{font-size:.83rem;color:var(--muted);padding-left:12px;border-left:1px solid var(--line)}
.tips b{display:block;color:#eee;font-weight:500;font-size:.83rem}
.sub-h{margin:20px 0 8px;font-size:.82rem;font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--dim)}
.route{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.route li{display:grid;grid-template-columns:68px 1fr;gap:2px 10px;font-size:.84rem;color:var(--muted);padding-bottom:10px;border-bottom:1px solid rgba(255,255,255,.06)}
.route .wk{font-family:var(--mono);font-size:.66rem;letter-spacing:.08em;color:var(--teal);grid-row:span 2;padding-top:2px}
.route b{color:#eee;font-weight:500;font-size:.88rem}
.route em{font-style:normal;font-family:var(--mono);font-size:.68rem;color:var(--dim);grid-column:2;order:3}
.route p{grid-column:2;margin:4px 0 0}
.picks{margin-top:18px;padding:14px;border-radius:12px;background:rgba(251,191,36,.07);border:1px solid rgba(251,191,36,.2)}
.picks-h{display:block;font-family:var(--mono);font-size:.64rem;letter-spacing:.14em;text-transform:uppercase;color:var(--amber);margin-bottom:8px}
.picks div{font-size:.82rem;color:#e6e9eb;margin-top:6px}
.picks b{color:#fff;font-weight:500}
.tbl{overflow-x:auto;margin-top:12px;border:1px solid var(--line);border-radius:12px}
.tbl table{width:100%;border-collapse:collapse;font-size:.79rem;min-width:520px}
.tbl th,.tbl td{text-align:left;padding:9px 12px;border-bottom:1px solid rgba(255,255,255,.07);vertical-align:top}
.tbl th{font-family:var(--mono);font-size:.64rem;letter-spacing:.12em;text-transform:uppercase;color:var(--dim);font-weight:500;background:rgba(255,255,255,.03)}
.tbl td:first-child{color:var(--dim);font-family:var(--mono);width:38px}
.tbl td span{color:var(--dim);font-size:.74rem}
.tbl tr:last-child td{border-bottom:0}
.bee-tip{margin-top:14px!important;font-size:.82rem;color:var(--muted);padding:10px 12px;border-radius:10px;background:rgba(255,255,255,.035)}
.bee-tip b{color:var(--amber);font-weight:500}

/* art */
.art-card{margin-top:32px;border-radius:20px;border:1px solid var(--line);overflow:hidden;background:radial-gradient(600px 320px at 50% 30%,rgba(236,112,150,.1),transparent 70%),rgba(255,255,255,.02)}
#artCanvas{width:100%;height:clamp(280px,42vw,420px);display:block}
.art-bar{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;padding:14px 18px;border-top:1px solid var(--line);font-size:.8rem;color:var(--dim)}
.art-bar .ghost{background:none;border:1px solid var(--line);border-radius:999px;padding:8px 15px;font-size:.8rem;cursor:pointer;transition:background .2s,border-color .2s}
.art-bar .ghost:hover{background:rgba(255,255,255,.08);border-color:var(--line-strong)}

/* courses */
.course-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px;margin-top:32px}
.course{display:grid;gap:7px;padding:24px;border-radius:18px;border:1px solid var(--line);background:rgba(255,255,255,.025);transition:transform .25s,border-color .25s,background .25s}
.course:hover{transform:translateY(-3px);border-color:rgba(120,160,240,.5);background:rgba(120,160,240,.07)}
.c-src{font-family:var(--mono);font-size:.64rem;letter-spacing:.13em;text-transform:uppercase;color:var(--blue)}
.course b{font-size:1.12rem;font-weight:600;line-height:1.35}
.c-by{font-size:.8rem;color:var(--dim)}
.c-note{font-size:.87rem;color:var(--muted);margin-top:4px}
.c-go{margin-top:10px;font-size:.82rem;color:#fff}

/* gallery */
.album{margin-top:30px;border-radius:20px;border:1px solid var(--line);overflow:hidden;background:rgba(255,255,255,.02)}
.album-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 16px;padding:18px 20px;border-bottom:1px solid var(--line)}
.a-date{font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;color:var(--amber)}
.album-head b{font-weight:500;font-size:1rem}
.a-where{margin-left:auto;font-size:.76rem;color:var(--dim)}
.photos{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:6px;padding:6px}
.ph{position:relative;border:0;padding:0;background:#0d0e10;border-radius:8px;overflow:hidden;cursor:zoom-in;aspect-ratio:4/3}
.ph img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease,opacity .4s ease;opacity:0}
.ph img.is-loaded{opacity:1}
.ph:hover img{transform:scale(1.045)}
.ph::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 60%,rgba(0,0,0,.35))}
.ph.is-missing{display:grid;place-items:center;cursor:default}
.ph.is-missing::before{content:"照片加载失败 · 请检查网络";position:absolute;font-size:.7rem;color:var(--dim);text-align:center;padding:10px}

#lightbox{width:min(1080px,94vw);max-height:92vh;padding:0;border:1px solid var(--line);border-radius:16px;background:#08090b;color:#fff;overflow:hidden}
#lightbox::backdrop{background:rgba(0,0,0,.86);backdrop-filter:blur(6px)}
#lightbox .lb-in{display:grid}
#lightbox img{width:100%;max-height:78vh;object-fit:contain;background:#000}
#lightbox .lb-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;font-size:.8rem;color:var(--muted);border-top:1px solid var(--line)}
#lightbox button{background:none;border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:.78rem;cursor:pointer;color:#fff}
#lightbox button:hover{background:rgba(255,255,255,.1)}

/* what we do */
.acts{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin-top:32px}
.acts > div{padding:20px;border-radius:16px;border:1px solid var(--line);background:rgba(255,255,255,.025)}
.acts b{display:block;font-size:.98rem;font-weight:500;margin-bottom:6px}
.acts span{font-size:.85rem;color:var(--muted)}
.acts .hl{display:block;margin-top:12px;font-style:normal;font-size:.78rem;color:var(--amber);padding-top:10px;border-top:1px dashed rgba(251,191,36,.3)}
.bee{margin-top:18px;padding:24px;border-radius:18px;border:1px solid rgba(251,191,36,.24);background:linear-gradient(120deg,rgba(251,191,36,.1),rgba(255,255,255,.02))}
.bee .serif{color:var(--amber);font-size:1.3rem}
.bee p{margin:8px 0 0;font-size:.9rem;color:#e8ebee;max-width:70ch}
.bee b{color:#fff;font-weight:600}

/* join */
.join-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:28px;margin-top:34px;align-items:start}
.join h2{margin-bottom:0}
.nn{font-family:var(--serif);font-style:italic;font-weight:400;color:var(--mint)}
.contact{margin-top:0;border-radius:18px;border:1px solid var(--line);background:rgba(255,255,255,.03);overflow:hidden}
.row{display:flex;align-items:center;gap:14px;padding:15px 18px;border-bottom:1px solid rgba(255,255,255,.07)}
.row:last-child{border-bottom:0}
.row > div{min-width:0}
.k{font-family:var(--mono);font-size:.62rem;letter-spacing:.13em;text-transform:uppercase;color:var(--dim)}
.v{font-size:.92rem;overflow-wrap:anywhere}
.row .ghost{margin-left:auto;flex:none;background:none;border:1px solid var(--line);border-radius:999px;padding:6px 13px;font-size:.74rem;color:var(--muted);cursor:pointer;transition:background .2s,color .2s}
.row .ghost:hover{background:rgba(255,255,255,.1);color:#fff}

/* footer */
.site-foot{border-top:1px solid var(--line);padding:40px 0 46px;font-size:.8rem;color:var(--dim)}
.foot-in{display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between}
.foot-brand{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:.85rem}
.foot-links{display:flex;flex-wrap:wrap;gap:18px}
.foot-links a:hover{color:#fff}

/* reveal — visible by default, animates in on first view */
@keyframes riseIn{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.reveal.is-in{animation:riseIn .7s cubic-bezier(.2,.7,.2,1) both}

/* responsive */
@media (max-width:1080px){
  .nav{display:none}
  .burger{display:grid}
  .ex-grid{grid-template-columns:1fr}
  .ex-info{position:static;min-height:0}
  .join-grid{grid-template-columns:1fr}
}
@media (max-width:720px){
  .bar{height:64px}
  .mobile-nav{inset:64px 10px auto 10px}
  html{scroll-padding-top:76px}
  .hero{padding-top:108px}
  .head-cta{display:none}
  .book{grid-template-columns:88px 1fr}
  .bq{padding:16px 16px}
  .album-head b{font-size:.94rem}
  .a-where{margin-left:0;width:100%}
  .photos{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
  .route li{grid-template-columns:58px 1fr}
  .qtext{font-size:1.22rem}
}
/* ---------- end ---------- */

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .reveal{opacity:1;transform:none}
}