:root{--forest:#123f35;--forest2:#0b3029;--gold:#c7a74b;--cream:#fbf7ea;--paper:#fffefa;--ink:#24312d;--muted:#69756f;--line:#e8dfc8;--shadow:0 12px 30px rgba(23,54,46,.10)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:linear-gradient(180deg,#f7f0dc 0,#fffefa 320px);color:var(--ink);font:17px/1.65 system-ui,-apple-system,"Segoe UI",sans-serif}a{color:var(--forest)}
header{background:linear-gradient(135deg,var(--forest2),var(--forest));color:white;box-shadow:0 4px 18px rgba(0,0,0,.15);position:sticky;top:0;z-index:20}.topbar,.nav,main,footer{max-width:1180px;margin:auto}.topbar{padding:17px 22px 8px;font-size:21px;letter-spacing:.3px;color:#fff7d7}.nav{display:flex;gap:6px;flex-wrap:wrap;padding:4px 18px 15px}.nav a{color:white;text-decoration:none;font-weight:700;font-size:14px;padding:10px 12px;border-radius:999px}.nav a:hover{background:rgba(255,255,255,.13)}
main{padding:42px 22px 60px}h1{font-size:clamp(30px,5vw,52px);line-height:1.08;color:var(--forest);margin:0 0 10px}h2,h3{line-height:1.25;color:var(--forest)}.muted{color:var(--muted);font-size:18px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;margin-top:28px}.card{background:rgba(255,255,255,.94);border:1px solid var(--line);border-radius:20px;padding:24px;box-shadow:var(--shadow);transition:.18s}.card:hover{transform:translateY(-2px);box-shadow:0 16px 36px rgba(23,54,46,.14)}.card h2{margin-top:0}.btn,button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;border:0;border-radius:13px;padding:12px 18px;background:var(--forest);color:white!important;text-decoration:none;font-weight:800;cursor:pointer;box-shadow:0 5px 12px rgba(18,63,53,.15)}.btn:hover,button:hover{filter:brightness(1.08)}input,select{width:100%;max-width:760px;padding:14px 16px;border:1px solid #cfc6ae;border-radius:13px;background:white;font-size:17px}.reader-nav{position:sticky;bottom:14px;z-index:15;display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:36px auto 10px;padding:9px;background:rgba(255,254,250,.94);backdrop-filter:blur(8px);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);max-width:720px}.reader-nav a{min-width:120px;text-align:center;padding:11px 14px;border-radius:12px;text-decoration:none;font-weight:800;background:var(--forest);color:white}.reader-nav a.secondary{background:#f1e6c5;color:var(--forest)}footer{border-top:1px solid var(--line);padding:26px 22px 40px;color:var(--muted);text-align:center}.hero-note{background:#f1e6c5;border-left:5px solid var(--gold);padding:14px 18px;border-radius:12px;margin:22px 0}.section-title{margin-top:44px}.quick-search{margin:24px 0;padding:18px;background:white;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
@media(max-width:760px){body{font-size:16px}header{position:relative}.topbar{font-size:18px}.nav{overflow-x:auto;flex-wrap:nowrap;padding-bottom:12px}.nav a{white-space:nowrap}.grid{grid-template-columns:1fr}main{padding:30px 16px 50px}.reader-nav{bottom:8px}.reader-nav a{min-width:96px;flex:1}.card{padding:20px}}
/* Diệu An modern overlay — QA7 */
:root{--da-green:#173f35;--da-gold:#b88a2b;--da-cream:#fffaf0;--da-ink:#17211d}
body{background:linear-gradient(180deg,#fbfaf5,#fff);color:var(--da-ink)}
.topbar{background:linear-gradient(110deg,#103c32,#245b4b);color:#fff;padding:22px 5vw;font-size:clamp(18px,2.4vw,30px);letter-spacing:.04em;box-shadow:0 3px 16px #0002}
.nav{position:sticky;top:0;z-index:20;background:#fffdf8eF;backdrop-filter:blur(12px);display:flex;gap:7px;overflow:auto;padding:10px 4vw;border-bottom:1px solid #e8dec7}.nav a{white-space:nowrap;border-radius:999px;padding:9px 13px;text-decoration:none;font-weight:700}.nav a:hover{background:#f4ead2;color:#173f35}
main{max-width:1180px;margin:auto;padding:34px 5vw 110px}h1{color:var(--da-green);font-size:clamp(30px,5vw,54px);line-height:1.08}.grid{gap:18px}.card{border:1px solid #e7dfcf;border-radius:20px;padding:22px;background:#fff;box-shadow:0 8px 30px #173f3510;transition:.2s}.card:hover{transform:translateY(-2px);box-shadow:0 12px 34px #173f3520}.btn{display:inline-block;background:var(--da-green);color:white!important;padding:12px 17px;border-radius:12px;text-decoration:none;font-weight:800;border:0}.btn:hover{background:#225f4d}.quick-search{border-radius:22px;padding:24px;background:linear-gradient(120deg,#f8efd9,#fff);border:1px solid #eadbb9}
.da-reader-dock{position:fixed;z-index:50;left:50%;bottom:14px;transform:translateX(-50%);display:flex;gap:5px;padding:7px;border-radius:18px;background:#123c33ee;box-shadow:0 10px 35px #0004;backdrop-filter:blur(10px);max-width:96vw}.da-reader-dock button{border:0;border-radius:12px;background:#fff;color:#173f35;padding:11px 13px;font-weight:800;white-space:nowrap;cursor:pointer}.da-reader-dock button:hover{background:#f6e8c4}.da-modal{display:none;position:fixed;z-index:100;inset:0;background:#0008;padding:6vh 4vw}.da-modal.open{display:block}.da-modal-box{max-width:680px;margin:auto;background:#fff;border-radius:24px;padding:28px;position:relative;box-shadow:0 30px 90px #0006}.da-modal-box input{width:100%;box-sizing:border-box;padding:15px;border:1px solid #cfc7b5;border-radius:12px;font-size:18px;margin:10px 0}.da-close{position:absolute;right:15px;top:10px;border:0;background:none;font-size:32px;cursor:pointer}.da-links{margin-top:18px}
.dict-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}.dict-tab{padding:10px 14px;border-radius:999px;background:#f5edd9;font-weight:800}.status-note{font-size:.92em;background:#fff8df;border-left:4px solid var(--da-gold);padding:10px 12px;border-radius:8px}
@media(max-width:650px){.da-reader-dock{bottom:7px}.da-reader-dock button{padding:10px 8px;font-size:12px}.da-reader-dock button[data-da="back"],.da-reader-dock button[data-da="next"]{display:none}.topbar{padding:17px 4vw}main{padding-left:4vw;padding-right:4vw}}
/* QA8: mục lục nổi + tra cứu nhanh */
.da-toc-list{display:grid;gap:8px;max-height:62vh;overflow:auto;padding:4px}.da-toc-list a{display:block;padding:12px 14px;border:1px solid #e6dcc4;border-radius:12px;text-decoration:none;background:#fffdf7;font-weight:750}.da-toc-list a:hover{background:#f6ecd3}.da-modal-box h2{padding-right:38px}.da-close{color:#173f35!important;box-shadow:none!important}.da-links a{cursor:pointer;font-weight:750}
/* QA11 — refinement: active section, accessibility, desktop/mobile navigation */
.nav a[aria-current="page"]{background:#f1e3bd;color:#173f35!important;box-shadow:inset 0 0 0 1px #d8c18a}
:focus-visible{outline:3px solid #d0a33b;outline-offset:3px}.card .btn{margin-top:6px}.da-reader-dock button{min-height:46px}
@media(max-width:650px){.da-reader-dock{width:calc(100vw - 14px);justify-content:space-between}.da-reader-dock button{flex:1}.da-reader-dock button[data-da="back"],.da-reader-dock button[data-da="next"]{display:block;font-size:0}.da-reader-dock button[data-da="back"]:after{content:'←';font-size:20px}.da-reader-dock button[data-da="next"]:after{content:'→';font-size:20px}}