/* Thiên An grade pages – shares tokens with the homepage */
:root{--bg:#F3F6FA;--surface:#fff;--ink:#18213F;--muted:#56627F;--line:#D8DFEA;--navy:#283260;--navy-2:#34497A;--sky:#5E95B8;--sky-soft:#E3EEF6;--signal:#C9652B;
--f-display:"Archivo","Be Vietnam Pro","PingFang SC","Microsoft YaHei",system-ui,sans-serif;--f-body:"Be Vietnam Pro","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;--f-mono:"JetBrains Mono",ui-monospace,Menlo,monospace}
@media (prefers-color-scheme:dark){:root{--bg:#0F1426;--surface:#171E36;--ink:#E7ECF5;--muted:#9AA7C2;--line:#2A3453;--navy:#1B2448;--navy-2:#2A3A66;--sky:#7FB2D3;--sky-soft:#1D2C4A;--signal:#E58A52;color-scheme:dark}}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 var(--f-body);-webkit-font-smoothing:antialiased}
a{color:inherit}img{max-width:100%;height:auto;display:block}
.wrap{max-width:1180px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
h1,h2{font-family:var(--f-display);text-wrap:balance;line-height:1.12;margin:0}
h1{font-size:clamp(1.9rem,4.4vw,3rem);font-weight:850;font-stretch:84%;letter-spacing:-.01em}
h2{font-size:clamp(1.35rem,2.6vw,1.8rem);font-weight:800;font-stretch:88%;margin-bottom:16px}
.eyebrow{font:700 .74rem var(--f-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--sky)}
.muted{color:var(--muted)}.lead{color:var(--muted);max-width:62ch}
.btn{display:inline-flex;align-items:center;justify-content:center;font:600 .95rem/1 var(--f-body);padding:13px 18px;border-radius:8px;text-decoration:none;border:0}
.btn-sky{background:var(--sky);color:#0E1631}.btn-ink{background:var(--navy);color:#fff}.btn-line{border:1px solid var(--line);background:var(--surface)}
@media (prefers-color-scheme:dark){.btn-ink{background:var(--sky);color:#0E1631}}
header.top{position:sticky;top:0;z-index:50;background:var(--navy);color:#fff}
.top .wrap{display:flex;align-items:center;gap:18px;min-height:64px;flex-wrap:wrap;padding-block:8px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}.brand svg{width:40px;height:40px}
.brand b{display:block;font:800 1rem/1.1 var(--f-display);font-stretch:92%;letter-spacing:.04em}.brand small{display:block;font:500 .62rem var(--f-mono);letter-spacing:.18em;color:#B9C7DE}
nav.main{display:flex;gap:4px;margin-left:auto}nav.main a{text-decoration:none;color:#B9C7DE;padding:8px 10px;border-radius:6px;font-size:.92rem;white-space:nowrap}nav.main a:hover{color:#fff;background:rgba(255,255,255,.08)}
.lang{display:flex;gap:2px;border:1px solid rgba(255,255,255,.25);border-radius:999px;padding:3px}.lang a{text-decoration:none;font:700 .74rem var(--f-mono);padding:5px 10px;border-radius:999px;color:#B9C7DE}.lang a[aria-current]{background:#fff;color:#283260}
@media (max-width:900px){nav.main{order:3;width:100%;margin-left:0;overflow-x:auto}.lang{margin-left:auto}.top .btn{display:none}}
.crumbs{font-size:.86rem;color:var(--muted);padding-block:18px}.crumbs a{text-decoration:none}
.hero{display:grid;grid-template-columns:1fr 1.1fr;gap:clamp(24px,4vw,56px);align-items:start;padding-bottom:40px}
.gallery{display:grid;gap:12px}.gallery figure{margin:0;background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.gallery figure:first-child img{width:100%;aspect-ratio:4/3;object-fit:contain;background:#fff}
.gallery figure:not(:first-child) img{width:100%;aspect-ratio:16/9;object-fit:cover}
.info{display:grid;gap:14px;min-width:0}.sub{margin:0;font-weight:600}
.facts{margin:0;border-top:1px solid var(--line)}.facts div{display:grid;grid-template-columns:170px 1fr;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}
.facts dt{font:700 .72rem var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);padding-top:3px}.facts dd{margin:0}
.cta{display:flex;gap:10px;flex-wrap:wrap}
@media (max-width:820px){.hero{grid-template-columns:1fr}.facts div{grid-template-columns:1fr;gap:2px}}
.block{padding-block:28px}
.apps{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px}.apps li{background:var(--sky-soft);padding:8px 14px;border-radius:999px;font-weight:500}
.tbl{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
table{width:100%;border-collapse:collapse;min-width:480px}th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line)}tr:last-child th,tr:last-child td{border-bottom:0}
thead th{font:700 .72rem var(--f-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);background:var(--bg)}
td:nth-child(2){font-variant-numeric:tabular-nums;font-weight:700}tbody th{font-weight:500}
.note{font-size:.86rem;color:var(--muted);max-width:75ch}
details{border-bottom:1px solid var(--line);padding:12px 0}summary{cursor:pointer;font-weight:600}details p{margin:8px 0 0;color:var(--muted);max-width:75ch}
.rels{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}.rel{display:grid;gap:2px;padding:14px;border:1px solid var(--line);border-radius:10px;background:var(--surface);text-decoration:none}
.rel b{font:850 1.3rem var(--f-display);font-stretch:80%}.rel span{font-size:.85rem;color:var(--muted)}
.chips{display:flex;gap:6px;flex-wrap:wrap;margin:22px 0}.chip{font:700 .8rem var(--f-mono);padding:8px 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--muted);cursor:pointer}.chip.on{background:var(--navy);border-color:var(--navy);color:#fff}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden;text-decoration:none;display:flex;flex-direction:column}.card:hover{border-color:var(--sky)}
.thumb{background:#fff;width:100%;aspect-ratio:4/3;overflow:hidden;flex:none}.thumb img{width:100%;height:100%;object-fit:cover}
.cb{padding:12px 14px 14px;display:grid;gap:2px}.cb b{font:850 1.6rem/1.05 var(--f-display);font-stretch:80%}.cb span{font-size:.86rem}
.cb .chip{justify-self:start;padding:3px 8px;font-size:.68rem;cursor:default;margin-bottom:4px}
[hidden]{display:none!important}
footer{background:var(--navy);color:#B9C7DE;margin-top:40px;font-size:.9rem}footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-block:26px}footer b{color:#fff}
.fab{position:fixed;right:16px;bottom:16px;width:54px;height:54px;border-radius:50%;background:#0068FF;color:#fff;display:grid;place-items:center;font:800 .8rem var(--f-display);text-decoration:none;box-shadow:0 8px 24px rgba(0,60,160,.35)}
:focus-visible{outline:3px solid var(--sky);outline-offset:2px}