@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* ===== Design tokens ===== */
:root{
  color-scheme:dark;
  --bg:#08111b;--bg2:#0c1724;--panel:#111e2e;--panel2:#152639;--line:#22374b;--line2:#2f4a62;
  --text:#eef4fa;--muted:#9fb3c4;--faint:#7590a5;
  --cyan:#86e4ed;--violet:#a6b8ff;--gold:#ffd9a0;--accent:linear-gradient(110deg,#8fe3f0,#a4b6fd);
  --radius:16px;--radius-sm:10px;
  --shadow:0 18px 50px #0209134d;--shadow-sm:0 6px 20px #02091333;
  --ring:0 0 0 3px #86e4ed33;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:15px/1.65 'Plus Jakarta Sans',system-ui,-apple-system,'Segoe UI',sans-serif;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;min-height:100vh;display:flex;flex-direction:column}
main{flex:1}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
img{max-width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:6px}
::selection{background:#86e4ed44}
body:before{content:'';position:absolute;pointer-events:none;z-index:-1;top:0;left:0;right:0;height:760px;background:radial-gradient(ellipse at 82% 0%,#17405566 0,transparent 50%),radial-gradient(ellipse at 4% 4%,#252f5544 0,transparent 40%)}
.container{width:min(1200px,calc(100% - 48px));margin-inline:auto}
[hidden]{display:none!important}

/* ===== Header ===== */
.header{border-bottom:1px solid var(--line);background:#08111bd9;backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);position:sticky;top:0;z-index:20}
.nav{min-height:68px;display:flex;align-items:center;gap:24px}
.logo{display:flex;align-items:center;gap:11px;flex-shrink:0}
.logo-mark{width:40px;height:40px;display:block;object-fit:contain;filter:drop-shadow(0 2px 10px #2fd3e840)}
.logo strong{font-size:16.5px;letter-spacing:.1px;line-height:1.15;display:block;font-weight:800}
.logo strong b{font-weight:800;background:linear-gradient(110deg,#4fe3e1,#2bb6f0);-webkit-background-clip:text;background-clip:text;color:transparent}
.logo small{color:var(--faint);font-size:10px;letter-spacing:1.2px;font-weight:600}
.nav-search{position:relative;flex:1;max-width:420px;display:flex;align-items:center}
.nav-search svg{position:absolute;left:13px;color:var(--faint);pointer-events:none}
.nav-search input{width:100%;height:40px;background:var(--panel);border:1px solid var(--line2);color:var(--text);border-radius:var(--radius-sm);padding:0 40px 0 38px;outline:none;font-size:13.5px;transition:border-color .15s,box-shadow .15s,background .15s}
.nav-search input::placeholder{color:var(--faint)}
.nav-search input:focus{border-color:var(--cyan);box-shadow:var(--ring);background:var(--panel2)}
.nav-search kbd{position:absolute;right:10px;font:600 11px/1 'Plus Jakarta Sans',sans-serif;color:var(--faint);border:1px solid var(--line2);border-radius:5px;padding:3px 6px;pointer-events:none}
.nav-search input:focus~kbd{display:none}
.links{display:flex;gap:4px;align-items:center;margin-left:auto}
.links a{color:#bfcedb;font-size:13px;font-weight:600;padding:8px 12px;border-radius:8px;transition:color .15s,background .15s;white-space:nowrap}
.links a:hover{color:var(--text);background:#ffffff0a}
.links .selected{color:var(--cyan);background:#86e4ed12}
.links a.nav-admin{display:none;border:1px solid #2f6f75;border-radius:999px;padding:6px 13px;color:#a7efeb;margin-left:6px}
.links a.nav-admin:hover{background:#163d3c}
.is-editor .links a.nav-admin{display:inline-block}

/* ===== Hero ===== */
.hero{padding:64px 0 36px}
.pill{display:inline-flex;gap:8px;align-items:center;color:#a7efdf;border:1px solid #2b6e6899;background:#163d3c66;border-radius:999px;font-size:11px;letter-spacing:1px;text-transform:uppercase;font-weight:700;padding:5px 12px}
.pill i{width:6px;height:6px;border-radius:50%;background:#6ee7c8;box-shadow:0 0 0 3px #6ee7c833}
.hero h1{font-size:clamp(34px,4.6vw,58px);line-height:1.12;letter-spacing:-1.8px;max-width:820px;margin:18px 0 14px;font-weight:800}
.hero h1 em{font-style:normal;background:var(--accent);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:16.5px;color:#b7cad8;max-width:700px;margin:0}
.hero-meta{margin-top:22px;display:flex;flex-wrap:wrap;gap:10px;align-items:center;color:var(--faint);font-size:12.5px}
.hero-meta b{color:#b9edec;font-weight:700}
.hero-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--faint)}
.home-hero{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(300px,1fr);gap:48px;align-items:center}
.hero-panel{position:relative;border:1px solid var(--line2);border-radius:20px;background:linear-gradient(150deg,#14283b,#0e1a28);padding:24px;box-shadow:var(--shadow);overflow:hidden}
.hero-panel::before{content:"";position:absolute;inset:-40% -30% auto auto;width:260px;height:260px;background:radial-gradient(circle,#86e4ed1f,transparent 70%);pointer-events:none}
.hp-head{display:flex;gap:14px;align-items:center;margin-bottom:18px}
.hp-icon{flex-shrink:0;width:42px;height:42px;border-radius:12px;display:grid;place-items:center;color:#ffd5a2;background:#56331d66;border:1px solid #9b745a66}
.hp-head small{color:var(--faint);font-size:11px;letter-spacing:1px;text-transform:uppercase;font-weight:700}
.hp-head h2{margin:2px 0 0;font-size:19px;letter-spacing:-.4px;line-height:1.3}
.hp-desc{font-size:13px!important;line-height:1.55;color:var(--muted)!important;margin:0 0 14px!important}
.ts-form textarea{width:100%;resize:vertical;min-height:84px;background:#0b1624;border:1px solid var(--line2);border-radius:12px;color:var(--text);font:inherit;font-size:13.5px;padding:11px 13px;outline:none;transition:border-color .15s,box-shadow .15s}
.ts-form textarea:focus{border-color:var(--cyan);box-shadow:var(--ring)}
.ts-form textarea::placeholder{color:var(--faint)}
.ts-row{display:flex;gap:10px;align-items:center;justify-content:space-between;margin-top:10px}
.ts-file{display:inline-flex;align-items:center;gap:7px;min-width:0;cursor:pointer;color:#bfd0de;font-size:13px;font-weight:650;border:1px dashed var(--line2);border-radius:10px;padding:9px 13px;transition:border-color .15s,color .15s}
.ts-file:hover,.ts-file.on{border-color:var(--cyan);color:var(--cyan)}
.ts-file span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:170px}
.ts-file input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.ts-form .cta:disabled{opacity:.6;cursor:wait}
.ts-result:empty{display:none}
.ts-result{margin-top:16px;padding-top:16px;border-top:1px solid var(--line);font-size:13px}
.ts-result h3{font-size:13px;margin:0 0 8px;color:var(--text);letter-spacing:-.1px}
.ts-subject{color:var(--muted);margin:0 0 12px}
.ts-related{display:grid;gap:8px;margin:0 0 14px}
.ts-related a{display:block;padding:10px 12px;border:1px solid #3d828799;background:#18434a55;border-radius:10px;color:#cfeff3;font-weight:650;line-height:1.4}
.ts-related a:hover{border-color:var(--cyan)}
.ts-points{list-style:none;counter-reset:ts;margin:0;padding:0;display:grid;gap:8px}
.ts-points li{counter-increment:ts;display:grid;grid-template-columns:26px 1fr;column-gap:10px;padding:10px 11px;border:1px solid var(--line);border-radius:11px;background:#0b1624aa}
.ts-points li::before{content:counter(ts);grid-row:span 3;width:26px;height:26px;border-radius:8px;display:grid;place-items:center;font-size:12px;font-weight:800;color:#ffd5a2;background:#56331d55;border:1px solid #9b745a55}
.ts-points b{font-size:13.5px;color:var(--text)}
.ts-points span{color:var(--muted);line-height:1.5}
.ts-points a{font-size:12px;color:#9fdbe3;text-decoration:underline;text-underline-offset:3px}
.ts-result details summary{cursor:pointer;color:#9fdbe3;font-weight:650;margin-bottom:8px}
.ts-note{color:var(--faint);font-size:12px;margin:12px 0 0}
.ts-note a{color:#9fdbe3;text-decoration:underline}
.ts-error{color:#ffc9a8}
.ts-loading{display:flex;gap:10px;align-items:center;color:var(--muted)}
.ts-loading i{width:16px;height:16px;border-radius:50%;border:2px solid var(--line2);border-top-color:var(--cyan);animation:ts-spin .8s linear infinite}
@keyframes ts-spin{to{transform:rotate(360deg)}}
.hero.small{padding:48px 0 8px}
.hero.small h1{font-size:clamp(28px,3.6vw,42px);letter-spacing:-1px;margin:14px 0 10px}
.hero.small p{font-size:14.5px;color:var(--muted)}

/* Ô tìm kiếm lớn */
.hero-search{position:relative;display:flex;align-items:center;max-width:720px;margin-top:28px;background:var(--panel);border:1px solid var(--line2);border-radius:14px;padding:6px;box-shadow:var(--shadow-sm);transition:border-color .15s,box-shadow .15s}
.hero-search:focus-within{border-color:var(--cyan);box-shadow:var(--ring),var(--shadow-sm)}
.hero-search svg{position:absolute;left:19px;top:19px;color:var(--faint);width:19px;height:19px;pointer-events:none}
.hero-search input{flex:1;min-width:0;height:46px;background:transparent;border:0;outline:none;color:var(--text);font-size:15.5px;padding:0 14px 0 44px}
.hero-search input::placeholder{color:var(--faint)}
.hero-search input::-webkit-search-cancel-button{filter:invert(.7)}
.hero-search button{flex-shrink:0;height:46px;padding:0 22px;border:0;border-radius:10px;background:var(--accent);color:#082032;font-weight:800;font-size:14px;cursor:pointer;transition:filter .15s}
.hero-search button:hover{filter:brightness(1.08)}
.hero-chips{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:14px;font-size:12.5px}
.hero-chips span{color:var(--faint);margin-right:2px}
.hero-chips a{color:#c3d4e1;border:1px solid var(--line2);background:#111e2e99;padding:4px 11px;border-radius:999px;transition:border-color .15s,color .15s}
.hero-chips a:hover{border-color:var(--cyan);color:var(--cyan)}
.result-count{margin-top:16px!important;font-size:14px!important;color:var(--muted)!important}
.result-count b{color:var(--text)}

/* ===== Section heading ===== */
.section-head{margin:44px 0 20px;display:flex;align-items:flex-end;justify-content:space-between;gap:16px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.section-head h2{margin:0;font-size:21px;letter-spacing:-.4px;font-weight:800}
.section-head small{color:var(--faint);font-size:12.5px}

/* ===== Featured ===== */
.featured{display:grid;grid-template-columns:1.05fr 1fr;overflow:hidden;border:1px solid var(--line2);border-radius:20px;background:linear-gradient(125deg,#132637,#0f1c2b);box-shadow:var(--shadow)}
.featured-media{position:relative;min-height:360px;overflow:hidden;background:var(--panel2)}
.featured-media img{width:100%;height:100%;position:absolute;inset:0;object-fit:cover;transition:transform .5s}
.featured:hover .featured-media img{transform:scale(1.025)}
.featured-content{padding:clamp(24px,3.6vw,46px);display:flex;flex-direction:column;justify-content:center;align-items:flex-start}
.featured h3{font-size:clamp(22px,2.4vw,32px);line-height:1.28;letter-spacing:-.8px;margin:14px 0 12px}
.featured h3 a:hover{color:var(--cyan)}
.featured p{color:var(--muted);font-size:14.5px;margin:0}
.facts{font-size:12px;color:var(--faint);margin:14px 0 22px}

/* ===== Tags & buttons ===== */
.tag{display:inline-flex;align-items:center;border:1px solid #9b745a66;background:#56331d55;color:#ffd5a2;padding:3px 10px;border-radius:999px;font-size:10.5px;font-weight:800;letter-spacing:.7px;text-transform:uppercase;line-height:1.6}
.tag.guide{color:#b3e4ed;border-color:#3d828799;background:#18434a88}
a.tag:hover{filter:brightness(1.15)}
.cta{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--accent);color:#092032;border:0;border-radius:10px;font-size:13.5px;font-weight:800;padding:11px 18px;cursor:pointer;transition:filter .15s,transform .15s;white-space:nowrap}
.cta:hover{filter:brightness(1.08);transform:translateY(-1px)}

/* ===== Filters ===== */
.filterbar{display:flex;flex-wrap:wrap;align-items:center;gap:12px;justify-content:space-between}
.filters{display:flex;gap:6px;flex-wrap:wrap}
.filter{border:1px solid var(--line2);color:#bfd0de;background:var(--panel);border-radius:999px;padding:7px 15px;font-weight:650;cursor:pointer;font-size:12.5px;transition:border-color .15s,color .15s,background .15s}
.filter:hover{border-color:#4f7590;color:var(--text)}
.filter.active{background:#a1e7eb;color:#0e2430;border-color:#a1e7eb}
.search{min-width:230px;max-width:360px;flex:1;background:var(--panel);border:1px solid var(--line2);color:var(--text);border-radius:var(--radius-sm);padding:10px 14px;outline:none}
.search:focus{border-color:var(--cyan);box-shadow:var(--ring)}

/* ===== Cards ===== */
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin:22px 0 28px}
.article-card{display:flex;flex-direction:column;border:1px solid var(--line);background:var(--panel);overflow:hidden;border-radius:var(--radius);transition:transform .2s,border-color .2s,box-shadow .2s}
.article-card:hover{transform:translateY(-3px);border-color:#4f8aa6;box-shadow:var(--shadow-sm)}
.article-card>a{display:block;aspect-ratio:16/9;overflow:hidden;background:var(--panel2)}
.article-card img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .4s}
.article-card:hover img{transform:scale(1.03)}
.card-content{padding:18px 20px 16px;display:flex;flex:1;flex-direction:column}
.card-content h3{font-size:16.5px;line-height:1.45;margin:11px 0 8px;font-weight:700;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-content h3 a:hover{color:var(--cyan)}
.card-content p{color:var(--muted);font-size:13.5px;flex:1;margin:0 0 4px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-content>div:first-child{flex:1}
.card-content .bottom{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:12px;color:var(--faint);padding-top:14px;margin-top:14px;border-top:1px solid var(--line)}
.bottom a{color:#9ee6ec;font-weight:700}
.bottom a:hover{text-decoration:underline}
.empty{display:none;grid-column:1/-1;padding:44px 24px;text-align:center;border:1px dashed var(--line2);border-radius:var(--radius);color:var(--muted);background:#111e2e66}
.empty.visible{display:block}

/* ===== Pagination ===== */
.pager{display:flex;flex-wrap:wrap;justify-content:center;gap:6px;margin:8px 0 20px}
.pager a,.pager span{min-width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;padding:0 12px;border-radius:9px;border:1px solid var(--line2);background:var(--panel);font-size:13px;font-weight:650;color:#c4d4e0}
.pager a:hover{border-color:var(--cyan);color:var(--cyan)}
.pager span{border-color:transparent;background:transparent;color:var(--faint)}
.pager span.on{background:#a1e7eb;border-color:#a1e7eb;color:#0e2430}

/* ===== Tag cloud ===== */
.tag-cloud{margin:40px 0 0}
.tag-cloud h2{font-size:18px;margin:0 0 14px;letter-spacing:-.3px}
.tag-chips{display:flex;flex-wrap:wrap;gap:8px;margin:24px 0}
.tag-cloud .tag-chips{margin:0}
.tag-chips a{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line2);background:var(--panel);color:#c3d4e1;padding:6px 13px;border-radius:999px;font-size:13px;font-weight:600;transition:border-color .15s,color .15s}
.tag-chips a:hover{border-color:var(--cyan);color:var(--cyan)}
.tag-chips small{color:var(--faint);font-size:11px;font-weight:700;background:#ffffff0d;padding:0 6px;border-radius:999px}

/* ===== Mission banner ===== */
.mission{margin:52px 0 72px;padding:30px 34px;background:linear-gradient(110deg,#102a38,#19243f);border:1px solid var(--line2);border-radius:20px;display:flex;align-items:center;gap:30px;justify-content:space-between}
.mission h2{margin:0 0 6px;font-size:20px;letter-spacing:-.3px}
.mission p{color:#b4cbd9;margin:0;max-width:720px;font-size:14.5px}

/* ===== Footer ===== */
.footer{border-top:1px solid var(--line);color:var(--faint);padding:24px 0 34px;font-size:12.5px;background:var(--bg2)}
.footer .container{display:flex;justify-content:space-between;gap:10px 20px;flex-wrap:wrap}
.footer a{color:#aec2d1}
.footer a:hover{color:var(--cyan)}

/* ===== Article / static pages ===== */
.small-article{max-width:780px;margin:56px auto 88px}
.small-article h1{font-size:clamp(30px,3.8vw,44px);line-height:1.2;letter-spacing:-1px;margin:18px 0 14px}
.small-article h2{margin-top:38px;letter-spacing:-.4px}
.small-article p,.small-article li{font-size:17px;line-height:1.75;color:#c7d6e0}
.small-article li{margin-bottom:12px}
.small-article .note{padding:16px 20px;border:1px solid #3a5e70;border-radius:12px;background:#132a39;font-size:14.5px}
.small-article a:not(.tag):not(.cta):not(.back){color:#90e5ef;text-decoration:underline;text-underline-offset:3px}
.toc{margin:28px 0;border:1px solid var(--line2);background:var(--panel);border-radius:14px;padding:4px 20px}
.toc summary{cursor:pointer;font-weight:800;font-size:14px;padding:12px 0;letter-spacing:.2px}
.toc ol{margin:0 0 14px;padding-left:20px}
.toc li{font-size:14.5px!important;margin:0 0 6px!important}
.toc li.l3{margin-left:16px!important;list-style:circle}
.toc a{color:#bcd0de!important;text-decoration:none!important}
.toc a:hover{color:var(--cyan)!important}
.related{margin-bottom:60px}
.preview-bar{position:sticky;top:0;z-index:30}

/* ===== Responsive ===== */
@media(max-width:1020px){
  .home-hero{grid-template-columns:1fr;gap:32px}

  .nav{flex-wrap:wrap;gap:10px 16px;padding:10px 0}
  .nav-search{order:3;max-width:none;flex-basis:100%}
  .featured{grid-template-columns:1fr}.featured-media{min-height:300px}
  .cards{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:640px){
  .container{width:calc(100% - 32px)}
  .logo-mark{width:34px;height:34px}.logo strong{font-size:14px}.logo small{font-size:9px}
  .links{gap:0}.links a{font-size:12px;padding:6px 8px}
  .links a:nth-child(2),.links a[href="/gioi-thieu.html"]{display:none}
  .nav-search kbd{display:none}
  .hero{padding:36px 0 24px}.hero h1{letter-spacing:-1.2px}.hero p{font-size:15px}
  .hero-search{flex-wrap:wrap;padding:5px}
  .hero-search input{height:44px}.hero-search svg{top:18px}
  .hero-search button{height:40px;padding:0 16px;font-size:13px}
  .featured-media{min-height:220px}.featured-content{padding:22px}
  .search{min-width:100%;max-width:none}
  .cards{grid-template-columns:1fr}
  .mission{display:block;padding:22px}.mission .cta{margin-top:16px}
  .section-head{margin-top:34px}.section-head h2{font-size:19px}
  .small-article{margin:36px auto 64px}
  .small-article p,.small-article li{font-size:16px}
}
@media(max-width:420px){.hero-search button{width:100%}.hero-search{gap:6px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* ===== Cộng đồng (trang chủ & /cong-dong) ===== */
.section-head .more{color:var(--cyan);font-size:13.5px;font-weight:700;white-space:nowrap}
.section-head .more:hover{text-decoration:underline}
.cm-home{margin-top:8px}
.cm-section+.cm-section{margin-top:-4px}
.cm-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.cm-card{display:flex;gap:16px;align-items:flex-start;padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(160deg,var(--panel2),var(--panel));transition:border-color .15s,transform .15s}
.cm-card:hover{border-color:var(--line2);transform:translateY(-2px)}
.cm-ava{position:relative;flex-shrink:0;width:56px;height:56px;border-radius:16px;background:var(--pc,#2b6f8a);color:#fff;display:grid;place-items:center}
.cm-ava>img{width:100%;height:100%;object-fit:cover;border-radius:16px;display:block}
.cm-ava>i{position:absolute;right:-6px;bottom:-6px;width:26px;height:26px;border-radius:50%;background:var(--pc);border:2px solid var(--panel);display:grid;place-items:center}
.cm-ava>i svg{width:14px;height:14px}
.cm-body{min-width:0;flex:1;display:grid;gap:6px}
.cm-meta{display:flex;flex-wrap:wrap;gap:6px;font-size:11.5px;font-weight:700;color:var(--faint);text-transform:uppercase;letter-spacing:.5px}
.cm-meta span+span:before{content:'·';margin-right:6px}
.cm-card h3{margin:0;font-size:17px;line-height:1.35;letter-spacing:-.2px}
.cm-card h3 a:hover{color:var(--cyan)}
.cm-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.55}
.cm-join{justify-self:start;margin-top:6px;display:inline-flex;gap:6px;align-items:center;padding:8px 14px;border-radius:999px;border:1px solid var(--line2);color:var(--cyan);font-size:13px;font-weight:700;transition:background .15s}
.cm-join:hover{background:#86e4ed1a}
@media(max-width:560px){.cm-cards{grid-template-columns:1fr}.cm-card{padding:16px}}