:root{
  --ink:#1a2430;--muted:#66727f;--line:#e4e9ee;--paper:#eef1f4;--white:#fff;
  --brand:#2f6f4f;--brand2:#2468a2;--gold:#a9791b;--red:#b0453b;--wash:#f1f4f6;
  --omni:#2f8f66;--casc:#3a7bb8;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;overflow:hidden}
body{background:#0f1720;color:var(--ink);font:15px/1.7 -apple-system,"Segoe UI","Microsoft YaHei",system-ui,sans-serif}
a{color:var(--brand2);text-decoration:none}a:hover{text-decoration:underline}
code{background:var(--wash);padding:1px 6px;border-radius:4px;font-size:.9em;font-family:"Cascadia Code",Consolas,monospace}

/* deck */
.deck{position:fixed;inset:0}
.slide{position:absolute;inset:0;opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .4s ease,transform .4s ease;display:flex;flex-direction:column;background:linear-gradient(180deg,#eef2f6 0%,#e6ecf1 100%)}
.slide.active{opacity:1;visibility:visible;transform:none;z-index:1}
.slide::before{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(900px 480px at 100% -8%,rgba(47,111,79,.10),transparent 60%),radial-gradient(700px 420px at -6% 108%,rgba(36,104,162,.08),transparent 55%)}
.slide-inner{position:relative;flex:1;overflow-y:auto;padding:52px max(28px,calc((100% - 1060px)/2)) 92px}
@media(min-width:1181px){
  body.has-side .slide-inner{
    padding-left:calc(212px + max(36px,(100% - 212px - 1000px)/2));
    padding-right:max(36px,calc((100% - 212px - 1000px)/2));
  }
}
.slide-inner::-webkit-scrollbar{width:10px}.slide-inner::-webkit-scrollbar-thumb{background:#c3ccd3;border-radius:5px}

/* top progress + nav */
.topbar{position:fixed;top:0;left:0;right:0;z-index:30;display:flex;align-items:center;gap:2px;background:linear-gradient(90deg,#111c26,#132b26);border-bottom:1px solid rgba(143,214,176,.15);padding:0 12px;height:48px;overflow:auto}
.topbar .brand{color:#8fd6b0;font-weight:800;font-size:13px;padding:0 14px 0 4px;white-space:nowrap;letter-spacing:1.2px}
.topbar a{color:#aeb9c2;font-weight:600;font-size:13px;padding:8px 13px;border-radius:8px;white-space:nowrap;transition:all .2s}
.topbar a:hover{background:rgba(255,255,255,.09);color:#fff;text-decoration:none}
.topbar a.on{color:#fff;background:linear-gradient(135deg,#2f6f4f,#2468a2);box-shadow:0 3px 10px rgba(36,104,162,.3)}
.progress{position:fixed;top:48px;left:0;height:3px;background:linear-gradient(90deg,#2f6f4f,#8fd6b0);z-index:31;transition:width .4s;box-shadow:0 0 8px rgba(143,214,176,.5)}

/* left sub-chapter rail — full-height column */
.side{position:fixed;left:0;top:48px;bottom:60px;z-index:29;width:212px;background:linear-gradient(180deg,#f5f8fa,#eaeff3);border-right:1px solid var(--line);box-shadow:2px 0 14px rgba(20,30,40,.05);padding:26px 16px;display:none;flex-direction:column;overflow-y:auto}
.side.show{display:flex}
.side .side-h{font-size:11px;font-weight:800;color:var(--brand);letter-spacing:2px;margin-bottom:16px;padding-bottom:13px;border-bottom:2px solid rgba(47,111,79,.18)}
.side a{display:block;font-size:14px;font-weight:700;color:#46545f;padding:14px 15px;border-radius:12px;cursor:pointer;margin:6px 0;line-height:1.3;border-left:3px solid transparent;transition:all .22s}
.side a b{display:block;font-size:16px;color:var(--brand);letter-spacing:.5px}
.side a small{display:block;font-size:12px;color:#93a0ab;font-weight:500;margin-top:4px}
.side a:hover{background:#fff;text-decoration:none;box-shadow:0 3px 10px rgba(20,30,40,.07)}
.side a.on{background:linear-gradient(140deg,#2f6f4f,#2468a2);color:#fff;border-left-color:var(--gold);box-shadow:0 8px 20px rgba(47,111,79,.32)}
.side a.on b,.side a.on small{color:#eaf5ef}
.side .side-f{margin-top:auto;padding-top:14px;font-size:11px;color:#9aa6b0;border-top:1px solid var(--line)}
@media(max-width:1180px){.side{display:none!important}}

/* footer controls */
.ctrl{position:fixed;bottom:0;left:0;right:0;z-index:30;display:flex;align-items:center;justify-content:space-between;background:linear-gradient(90deg,#111c26,#132b26);border-top:1px solid rgba(143,214,176,.15);padding:8px 18px;height:60px}
.ctrl .counter{color:#8fa0ac;font-size:12.5px;font-variant-numeric:tabular-nums;min-width:70px;font-weight:600}
.ctrl .btns{display:flex;gap:10px;min-width:70px;justify-content:flex-end}
.ctrl button{background:linear-gradient(135deg,#2f6f4f,#357a58);color:#fff;border:0;border-radius:9px;padding:9px 20px;font-size:13.5px;font-weight:700;cursor:pointer;transition:all .2s}
.ctrl button:hover{filter:brightness(1.12)}
.ctrl button:disabled{background:#2a333c;color:#5a656f;cursor:not-allowed;filter:none}
.subwrap{flex:1;display:flex;flex-direction:column;align-items:center;gap:7px;overflow:hidden;padding:0 14px}
.subwrap .subname{color:#e7edf1;font-size:13px;font-weight:600;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dots{display:flex;gap:7px;align-items:center}
.dots i{width:9px;height:9px;border-radius:50%;background:#3d4954;cursor:pointer;transition:all .28s}
.dots i:hover{background:#7f8b96}
.dots i.on{width:26px;border-radius:5px;background:linear-gradient(90deg,#3aa576,#8fd6b0)}

/* content */
.chapter-tag{display:inline-block;background:linear-gradient(135deg,#2f6f4f,#2468a2);color:#fff;font-weight:800;font-size:12px;padding:5px 15px;border-radius:20px;letter-spacing:1.5px;box-shadow:0 3px 10px rgba(47,111,79,.22)}
h2{font-size:30px;margin:14px 0 4px;font-weight:800;letter-spacing:-.3px}
h3{position:relative;font-size:19.5px;margin:22px 0 8px;color:#1c2a36;padding-left:15px;font-weight:800;letter-spacing:-.2px}
h3::before{content:"";position:absolute;left:0;top:3px;bottom:3px;width:5px;border-radius:3px;background:linear-gradient(#2f6f4f,#2468a2)}
h4{font-size:16px;margin:16px 0 4px;color:#2b3a47}
.lead{color:var(--muted);font-size:15.5px;margin:2px 0 8px;max-width:900px}
p{margin:8px 0}

.card{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin:12px 0;box-shadow:0 4px 16px rgba(20,30,40,.06)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.domain{background:var(--white);border:1px solid var(--line);border-top:4px solid var(--brand);border-radius:10px;padding:16px}
.domain h4{margin:0 0 5px}.domain p{margin:0;font-size:13.5px;color:var(--muted)}

figure{margin:10px 0;background:var(--white);border:1px solid var(--line);border-radius:10px;overflow:hidden}
figure img{display:block;width:100%;height:auto;max-height:56vh;object-fit:contain;background:#eef2f6;cursor:zoom-in;transition:filter .18s}
figure img:hover{filter:brightness(1.03)}
figure img.tall{max-height:46vh;object-fit:cover;object-position:top center}
figure video{display:block;width:100%;max-height:60vh;background:#000}
figcaption{padding:9px 14px;font-size:13px;color:var(--muted);border-top:1px solid var(--line);background:#fafbfc}
.imgrow{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.imgrow.three{grid-template-columns:1fr 1fr 1fr}
.imgrow.four{grid-template-columns:1fr 1fr 1fr 1fr}
.imgrow.four figure img{max-height:34vh}
.clips{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px;margin:8px 0}
.clips .clipcard{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
.clips video{display:block;width:100%;max-height:24vh;background:#000}
.clips .clipbody{padding:9px 12px}
.clips .clipbody h5{margin:0 0 5px;font-size:13px;color:var(--ink)}
.clips .clipbody p{margin:5px 0;font-size:11.5px;line-height:1.5}
.clips .lbl{color:#5a6b78;font-weight:700}
.clips .raw{color:#b0562f;font-weight:700}
.clips p.rawline{font-style:italic;color:#6a4a38;background:#fbf3ee;border-radius:7px;padding:7px 9px}
.clips .m1{color:#2f6f8f;font-weight:700}.clips .m2{color:#2f8f66;font-weight:700}

.badgeline{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}
.pill{display:inline-block;background:var(--wash);color:#33424e;border-radius:20px;padding:4px 12px;font-size:13px;font-weight:600}
.pill.win{background:#def0e5;color:var(--brand)}.pill.gold{background:#f7ecd2;color:var(--gold)}

.stat-row{display:flex;gap:12px;flex-wrap:wrap;margin:12px 0}
.stat{flex:1;min-width:140px;background:var(--white);border:1px solid var(--line);border-radius:10px;padding:14px;text-align:center}
.stat b{display:block;font-size:27px;color:var(--brand);font-weight:800;line-height:1.15}
.stat span{font-size:12.5px;color:var(--muted)}

table{width:100%;border-collapse:collapse;background:var(--white);border:1px solid var(--line);border-radius:8px;overflow:hidden;font-size:13.5px;margin:10px 0}
th,td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left}
th{background:var(--wash);font-size:12.5px}
tr:last-child td{border-bottom:0}
table.cmp{font-size:11.5px;table-layout:fixed}
table.cmp th,table.cmp td{padding:8px 10px;vertical-align:top;line-height:1.5}
table.cmp col.catcol{width:130px}
table.cmp td.cat{font-weight:700;background:var(--wash);color:#33424e}
table.cmp td.cat small{display:block;font-weight:400;color:var(--muted);margin-top:2px}
table.cmp .en{font-style:italic;color:#6a4a38}
table.cmp tr.r-hu td.cat{color:#7a5a12}table.cmp tr.r-raw td.cat{color:#b0562f}
table.cmp tr.r-ref td.cat{color:#8a5a2f}table.cmp tr.r-vo td.cat{color:#2f6f8f}table.cmp tr.r-ui td.cat{color:#2f8f66}

.callout{background:var(--white);border-left:5px solid var(--brand);border-radius:0 8px 8px 0;padding:12px 16px;margin:12px 0}
.callout.gold{border-left-color:var(--gold)}.callout.blue{border-left-color:var(--brand2)}
.callout p{margin:7px 0 0;line-height:1.65}.callout p:first-of-type{margin-top:5px}

.chart{margin:12px 0}
.bar-row{display:grid;grid-template-columns:160px 1fr 168px;gap:12px;align-items:center;margin:7px 0}
.bar-row .lbl{font-size:13px;font-weight:600}
.bar-track{height:20px;background:var(--wash);border-radius:5px;overflow:hidden}
.bar-track i{display:block;height:100%;border-radius:5px}
.bar-track i.omni{background:linear-gradient(90deg,#3aa576,#2f8f66)}
.bar-track i.casc{background:linear-gradient(90deg,#4d90cc,#3a7bb8)}
.bar-row .val{font-size:12.5px;text-align:right;color:var(--muted);font-variant-numeric:tabular-nums}
.bar-row .val b{color:var(--ink)}
.legend{display:flex;gap:18px;font-size:12.5px;color:var(--muted);margin:6px 0}
.legend span::before{content:"";display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:6px;vertical-align:-1px}
.legend .l-omni::before{background:#2f8f66}.legend .l-casc::before{background:#3a7bb8}

.formula{background:#12212b;color:#e8f0ec;border-radius:10px;padding:16px 18px;margin:12px 0;font-family:"Cambria Math","Times New Roman",serif;font-size:17px;text-align:center;overflow:auto}
.formula small{display:block;color:#8fb3a3;font-family:system-ui;font-size:12px;margin-top:8px}

.arch{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin:12px 0}
.arch .node{background:var(--white);border:1px solid var(--line);padding:14px;position:relative}
.arch .node:not(:last-child)::after{content:"→";position:absolute;right:-11px;top:50%;transform:translateY(-50%);color:var(--brand);font-weight:800;font-size:18px;z-index:2;background:var(--paper)}
.arch .node h5{margin:0 0 4px;color:var(--brand);font-size:14px}
.arch .node small{color:var(--muted);font-size:12px;line-height:1.5;display:block}
.arch .node:first-child{border-radius:10px 0 0 10px}.arch .node:last-child{border-radius:0 10px 10px 0}

ul.tight{margin:6px 0;padding-left:20px}ul.tight li{margin:4px 0}
.note{color:var(--muted);font-size:12.5px;margin-top:4px}
.quote{background:#f3f6f8;border-radius:8px;padding:10px 13px;font-style:italic;color:#33414d;font-size:13px;line-height:1.6;margin:8px 0}
.card h4.tag-raw{color:#b0562f}.card h4.tag-enh{color:#2f8f66}
.ph{background:#fff7e6;border:1px dashed var(--gold);border-radius:8px;padding:12px 16px;color:#7a5a12;font-size:13px}

/* layered tab switcher */
.tabbox{margin:12px 0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--white);box-shadow:0 4px 16px rgba(20,30,40,.06)}
.tabnav{display:flex;flex-wrap:wrap;background:linear-gradient(180deg,#f5f8fa,#eef2f6);border-bottom:1px solid var(--line)}
.tabbtn{flex:1;min-width:130px;border:0;background:transparent;padding:11px 14px;font-size:13.5px;font-weight:700;color:#5a6b78;cursor:pointer;border-bottom:3px solid transparent;transition:all .2s;line-height:1.25}
.tabbtn small{display:block;font-size:11px;color:#93a0ab;font-weight:600;margin-top:3px}
.tabbtn:hover{background:rgba(47,111,79,.06);color:var(--brand)}
.tabbtn.on{color:var(--brand);background:#fff;border-bottom-color:var(--brand)}
.tabbtn.on small{color:var(--brand2)}
.tabpanes{padding:14px 16px}
.tabpane{display:none;animation:tabfade .25s ease}
.tabpane.on{display:block}
@keyframes tabfade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.tabpane figure{margin:2px 0 8px}
.tabpane figure img{max-height:52vh}
.metricline{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 4px}
.metricline .mtag{background:var(--wash);border-radius:16px;padding:3px 11px;font-size:12px;color:#33424e;font-weight:600}
.metricline .mtag b{color:var(--brand)}
.metricline .mtag.bad{background:#fbe9e4;color:#b0453b}.metricline .mtag.bad b{color:#b0453b}

/* hero banner (opening slide) */
.hero{background:linear-gradient(135deg,#16212c 0%,#1f3a34 100%);color:#fff;border-radius:16px;padding:34px 40px;margin:4px 0 14px;box-shadow:0 12px 32px rgba(20,40,30,.22)}
.hero .kicker{color:#8fd6b0;font-weight:800;letter-spacing:4px;font-size:13px}
.hero h1{font-size:34px;line-height:1.22;margin:12px 0 12px;font-weight:800;color:#fff}
.hero p{color:#cdd8dd;font-size:16px;margin:0;max-width:920px}
.hero p b{color:#8fd6b0}

/* lightbox */
.lightbox{position:fixed;inset:0;z-index:60;display:none;align-items:flex-start;justify-content:center;background:rgba(8,14,20,.92);cursor:zoom-out;overflow:auto;padding:26px}
.lightbox.show{display:flex}
.lightbox img{max-width:1100px;width:100%;height:auto;border-radius:10px;box-shadow:0 20px 60px rgba(0,0,0,.6);background:#fff}
.lightbox::after{content:"点击任意处 / Esc 关闭";position:fixed;top:16px;right:22px;color:#cdd8dd;font-size:12px;letter-spacing:1px}

@media(max-width:820px){
  .hero h1{font-size:26px}
  .grid2,.grid4,.imgrow,.imgrow.four,.arch,.clips{grid-template-columns:1fr}
  .bar-row{grid-template-columns:108px 1fr 96px}
  .slide-inner{padding:60px 18px 84px}
}