:root{--bg:#ffffff;--surface:#f6f8fc;--ink:#10213a;--muted:#61708a;--line:#e6ebf3;--blue:#3b82f6;--blue2:#60a5fa;--navy:#0b1220;--yellow:#ffd84d;--green:#29c56f;--purple:#9b7bff;--orange:#ff9d5c;--shadow:0 20px 60px rgba(27,45,78,.10);--radius:24px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Be Vietnam Pro",sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}.container{width:min(1160px,calc(100% - 40px));margin:auto}.topbar{background:#0c1322;color:#dbe5f5;font-size:13px}.topbar-inner{min-height:38px;display:flex;align-items:center;justify-content:space-between;gap:20px}.topbar a{color:#fff;text-decoration:none;font-weight:700}.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(18px);border-bottom:1px solid rgba(230,235,243,.8)}.nav-wrap{height:78px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);min-width:180px}.brand-mark{width:46px;height:46px;display:grid;place-items:center;border-radius:15px;background:linear-gradient(135deg,#2f6ff0,#6e8cff);color:#fff;font-family:"Plus Jakarta Sans",sans-serif;font-weight:800;letter-spacing:.5px;box-shadow:0 10px 24px rgba(59,130,246,.24)}.brand-copy{display:flex;flex-direction:column;line-height:1.05}.brand-copy strong{font-family:"Plus Jakarta Sans",sans-serif;font-size:17px}.brand-copy small{margin-top:5px;color:#8190a8;font-size:9px;font-weight:800;letter-spacing:1.2px}.desktop-nav{display:flex;align-items:center;gap:26px}.desktop-nav a{color:#52627b;text-decoration:none;font-size:14px;font-weight:700}.desktop-nav a:hover{color:var(--blue)}.nav-actions{display:flex;align-items:center;gap:10px}.zalo-btn,.zalo-outline{display:inline-flex;align-items:center;gap:8px;border-radius:14px;text-decoration:none;font-weight:800}.zalo-btn{padding:11px 15px;background:#eaf7ff;color:#0077c8;border:1px solid #d2efff}.menu-btn{display:none;border:1px solid var(--line);background:#fff;width:44px;height:44px;border-radius:14px;font-size:22px}.mobile-nav{display:none;padding:0 20px 16px}.mobile-nav a{display:block;padding:12px 2px;text-decoration:none;color:#384761;font-weight:700}.hero{position:relative;overflow:hidden;padding:86px 0 58px;background:radial-gradient(circle at 85% 20%,rgba(122,157,255,.24),transparent 26%),radial-gradient(circle at 15% 5%,rgba(41,197,111,.12),transparent 20%),linear-gradient(180deg,#fbfdff 0%,#f6f8ff 100%)}.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;align-items:center;gap:70px}.hero-copy{position:relative;z-index:2}.eyebrow,.section-kicker{font-size:12px;font-weight:800;letter-spacing:1.5px;color:#6380a9}.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;background:#fff;border:1px solid #dde5f1;border-radius:999px;box-shadow:0 10px 24px rgba(38,61,96,.06)}.eyebrow-dot{width:7px;height:7px;border-radius:50%;background:#3b82f6;box-shadow:0 0 0 5px rgba(59,130,246,.10)}h1,h2,h3{font-family:"Plus Jakarta Sans",sans-serif;margin:0;line-height:1.08}h1{font-size:clamp(44px,5.4vw,76px);letter-spacing:-3px;max-width:760px;margin:20px 0}.hero-copy h1 span{background:linear-gradient(90deg,#2768ee,#7c5cff);-webkit-background-clip:text;background-clip:text;color:transparent}.hero-lead{max-width:640px;font-size:17px;color:#60708a;margin:0 0 24px}.course-note{display:flex;align-items:center;gap:12px;max-width:700px;margin:0 0 20px;padding:12px 14px;border:1px solid #dce7f7;border-radius:18px;background:rgba(255,255,255,.82);box-shadow:0 12px 30px rgba(43,72,118,.06)}.course-note-badge{width:38px;height:38px;display:grid;place-items:center;flex:0 0 38px;border-radius:12px;background:linear-gradient(135deg,#2563eb,#7c3aed);color:#fff;font:800 13px/1 "Plus Jakarta Sans",sans-serif;letter-spacing:.4px}.course-note div{flex:1;min-width:0}.course-note strong{display:block;font-size:13px;line-height:1.35}.course-note small{display:block;margin-top:3px;color:#71819a;font-size:11px}.course-note a{white-space:nowrap;text-decoration:none;color:#0b79cf;font-size:12px;font-weight:800;padding:8px 10px;border-radius:10px;background:#eaf7ff}.subject-card{position:relative;overflow:hidden}.subject-card:after{content:"";position:absolute;inset:auto -25px -35px auto;width:90px;height:90px;border-radius:50%;background:currentColor;opacity:.05;filter:blur(6px)}.subject-icon{width:48px!important;height:48px!important;border-radius:15px!important;display:grid!important;place-items:center;background:linear-gradient(145deg,#ffffff,rgba(255,255,255,.72))!important;border:1px solid rgba(255,255,255,.65);box-shadow:0 10px 22px rgba(40,60,100,.08);position:relative;z-index:1}.subject-icon svg{width:25px;height:25px}.subject-card div{position:relative;z-index:1}.subject-blue{color:#2563eb;background:linear-gradient(180deg,#ffffff,#f6f9ff)}.subject-blue .subject-icon{background:linear-gradient(145deg,#dce9ff,#edf4ff)!important}.subject-rose{color:#e15b7a;background:linear-gradient(180deg,#ffffff,#fff7f8)}.subject-rose .subject-icon{background:linear-gradient(145deg,#ffe4eb,#fff1f4)!important}.subject-indigo{color:#5b5bd6;background:linear-gradient(180deg,#ffffff,#f8f7ff)}.subject-indigo .subject-icon{background:linear-gradient(145deg,#e7e5ff,#f3f1ff)!important}.subject-cyan{color:#0ea5c9;background:linear-gradient(180deg,#ffffff,#f3fcff)}.subject-cyan .subject-icon{background:linear-gradient(145deg,#dbf6ff,#eefbff)!important}.subject-orange{color:#ea7a20;background:linear-gradient(180deg,#ffffff,#fff9f4)}.subject-orange .subject-icon{background:linear-gradient(145deg,#ffebd8,#fff5ea)!important}.subject-green{color:#22a060;background:linear-gradient(180deg,#ffffff,#f4fcf7)}.subject-green .subject-icon{background:linear-gradient(145deg,#dcf7e8,#effbf4)!important}.subject-amber{color:#c59617;background:linear-gradient(180deg,#ffffff,#fffdf3)}.subject-amber .subject-icon{background:linear-gradient(145deg,#fff2bb,#fff9df)!important}.subject-violet{color:#7b61d9;background:linear-gradient(180deg,#ffffff,#faf8ff)}.subject-violet .subject-icon{background:linear-gradient(145deg,#eee7ff,#f7f2ff)!important}.subject-card strong{color:var(--ink)}.subject-card small{color:#7b899f}.subject-card:hover{box-shadow:0 18px 36px rgba(26,45,79,.09);border-color:#d3dded}
.hero-search{display:flex;align-items:center;gap:12px;padding:8px 8px 8px 18px;background:#fff;border:1px solid #dde5f0;border-radius:18px;box-shadow:var(--shadow);max-width:700px}.hero-search>span{font-size:24px;color:#6d7d94}.hero-search input{flex:1;border:0;outline:0;font:inherit;font-size:15px;color:var(--ink);background:transparent}.hero-search button{border:0;background:#0f1f37;color:#fff;padding:13px 18px;border-radius:13px;font-weight:800;cursor:pointer}.hero-quick{display:flex;gap:12px;margin:16px 0 14px}.primary-btn,.secondary-btn,.ghost-btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;text-decoration:none;border-radius:14px;padding:13px 18px;font-weight:800;cursor:pointer}.primary-btn{background:#286ff2;color:#fff;box-shadow:0 12px 25px rgba(59,130,246,.22)}.ghost-btn{background:#fff;color:#243550;border:1px solid var(--line)}.hero-trust{display:flex;gap:16px;flex-wrap:wrap;color:#6f8097;font-size:13px;font-weight:700}.hero-card-wrap{position:relative;min-height:430px;display:flex;align-items:center;justify-content:center}.hero-card{position:relative;width:min(420px,100%);padding:24px;border-radius:30px;background:linear-gradient(145deg,#0e1728,#1d3155);color:#fff;box-shadow:0 35px 70px rgba(27,43,74,.22);overflow:hidden}.hero-card:before{content:"";position:absolute;inset:-20% -20% auto auto;width:260px;height:260px;border-radius:50%;background:rgba(96,165,250,.25);filter:blur(25px)}.hero-card-top{position:relative;display:flex;justify-content:space-between;align-items:center}.mini-label{font-size:11px;letter-spacing:1.8px;font-weight:800;color:#a9bddf}.mini-pill{font-size:10px;padding:7px 9px;background:#e8f7ee;color:#1b9850;border-radius:999px;font-weight:900}.hero-orb{position:relative;width:188px;height:188px;border-radius:50%;margin:34px auto 22px;background:radial-gradient(circle at 32% 28%,#ffffff 0%,#a6c7ff 25%,#5c7dff 52%,#22375f 74%);display:grid;place-items:center;box-shadow:0 0 0 14px rgba(255,255,255,.03),0 24px 45px rgba(68,123,255,.23)}.orb-inner{width:92px;height:92px;border-radius:26px;background:rgba(10,19,36,.88);display:grid;place-items:center;font:800 34px/1 "Plus Jakarta Sans"}.hero-card-content{text-align:center}.small-muted{color:#90a5c6;font-size:12px}.hero-card-content h3{font-size:25px;margin:8px 0}.hero-card-content p{margin:0;color:#9ab0d1;font-size:13px}.hero-stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:26px}.hero-stat-row>div{padding:12px 8px;border:1px solid rgba(255,255,255,.09);border-radius:15px;background:rgba(255,255,255,.04);text-align:center}.hero-stat-row strong{display:block;font-size:17px}.hero-stat-row span{display:block;color:#9fb1cc;font-size:10px;margin-top:2px}.float-note{position:absolute;background:#fff;color:#1a2b44;border:1px solid var(--line);padding:11px 14px;border-radius:14px;box-shadow:var(--shadow);font-size:12px;font-weight:800}.note-1{left:10px;top:82px}.note-2{right:0;bottom:74px}.announcement{padding:18px 0 0}.announcement-card{display:flex;align-items:center;gap:16px;padding:17px 18px;background:linear-gradient(90deg,#eff8ff,#f8f6ff);border:1px solid #dfe9f6;border-radius:20px}.announcement-icon{width:44px;height:44px;display:grid;place-items:center;background:#fff;border:1px solid #e3eaf4;border-radius:14px}.announcement-copy{flex:1;display:flex;flex-direction:column}.announcement-copy span{font-size:10px;font-weight:900;letter-spacing:1.3px;color:#6f7f96}.announcement-copy strong{font-size:14px;margin-top:2px}.announcement-btn{white-space:nowrap;text-decoration:none;background:#0d5bd7;color:#fff;padding:11px 15px;border-radius:13px;font-size:13px;font-weight:800}.section{padding:92px 0}.section-sm{padding:30px 0}.tinted{background:#f7f9fd}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.stat{padding:18px 20px;border:1px solid var(--line);background:#fff;border-radius:18px}.stat strong{display:block;font:800 26px/1 "Plus Jakarta Sans"}.stat span{color:#718199;font-size:13px}.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:28px}.section-head h2{font-size:36px;letter-spacing:-1.4px;margin:7px 0 8px}.section-head p,.section-lead{margin:0;color:#708097}.filter-row{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}.chip{border:1px solid var(--line);background:#fff;color:#64738b;padding:9px 12px;border-radius:999px;font:700 12px inherit;cursor:pointer}.chip.active{background:#0f1f37;color:#fff;border-color:#0f1f37}.resource-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.resource-card{background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden;transition:.25s;box-shadow:0 10px 28px rgba(26,45,79,.04)}.resource-card:hover{transform:translateY(-5px);box-shadow:0 20px 45px rgba(26,45,79,.11)}.resource-thumb{height:160px;display:grid;place-items:center;font-size:48px;background:linear-gradient(135deg,#e7f2ff,#f2edff);position:relative}.resource-badge{position:absolute;top:12px;right:12px;padding:7px 9px;border-radius:999px;background:#eaf9ef;color:#148849;font-size:10px;font-weight:900}.resource-body{padding:17px}.resource-meta{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:9px}.resource-meta span{font-size:10px;color:#6f8097;padding:5px 8px;border-radius:999px;background:#f4f6fa}.resource-body h3{font-size:18px}.resource-body p{color:#6b7a90;font-size:12px;margin:8px 0 14px}.resource-footer{display:flex;align-items:center;justify-content:space-between;gap:8px}.resource-link{font-weight:800;font-size:12px;color:#1f63da;text-decoration:none}.resource-file{font-size:11px;color:#8a98ad}.center{text-align:center;margin-top:28px}.secondary-btn{background:#fff;border:1px solid var(--line);color:#20324e}.category-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.category-card{display:flex;align-items:center;gap:14px;padding:18px;border:1px solid var(--line);border-radius:20px;background:#fff;text-decoration:none;color:var(--ink);transition:.2s}.category-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.cat-icon{width:46px;height:46px;border-radius:15px;display:grid;place-items:center;font-size:20px;background:#f3f6fb}.category-card div{flex:1}.category-card strong,.category-card small{display:block}.category-card small{font-size:12px;color:#74829a;margin-top:2px}.category-card>span:last-child{font-size:20px;color:#8aa0bf}.accent-blue .cat-icon{background:#eaf3ff}.accent-yellow .cat-icon{background:#fff6d9}.accent-green .cat-icon{background:#eaf9ef}.accent-purple .cat-icon{background:#f1edff}.subject-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.subject-card{display:flex;align-items:center;gap:12px;padding:16px;border:1px solid var(--line);border-radius:18px;text-decoration:none;color:var(--ink);background:#fff;transition:.2s}.subject-card:hover{border-color:#bcd2f8;transform:translateY(-3px)}.subject-card>span{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:#eef4ff;color:#316fe8;font-weight:900}.subject-card strong,.subject-card small{display:block}.subject-card strong{font-size:14px}.subject-card small{font-size:11px;color:#7b899f}.two-col{display:grid;grid-template-columns:.85fr 1.15fr;gap:60px;align-items:start}.two-col h2{font-size:38px;max-width:500px;margin:7px 0 12px}.steps{display:grid;gap:10px}.step{display:flex;gap:16px;align-items:flex-start;padding:17px 18px;border:1px solid var(--line);border-radius:18px;background:#fff}.step>span{font:800 12px/1 "Plus Jakarta Sans";padding:9px 10px;border-radius:10px;background:#eef4ff;color:#3873e8}.step strong,.step small{display:block}.step small{font-size:12px;color:#74829a;margin-top:2px}.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.article-card{overflow:hidden;border:1px solid var(--line);border-radius:22px;background:#fff}.article-thumb{height:170px;display:grid;place-items:center;font-size:48px}.thumb-blue{background:#eaf3ff}.thumb-yellow{background:#fff5d6}.thumb-purple{background:#f0ebff}.article-body{padding:17px}.article-body>span{font-size:10px;letter-spacing:1.2px;font-weight:900;color:#71839f}.article-body h3{font-size:18px;margin:8px 0}.article-body p{font-size:12px;color:#738199}.article-body a{display:inline-block;margin-top:5px;color:#2465dd;text-decoration:none;font-size:12px;font-weight:800}.final-cta{padding-top:20px}.final-cta-card{padding:34px;border-radius:28px;background:linear-gradient(135deg,#10203a,#1f3b72);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:30px;box-shadow:0 30px 70px rgba(15,36,74,.18)}.final-cta-card .section-kicker{color:#8fb0e7}.final-cta-card h2{font-size:34px;margin:8px 0}.final-cta-card p{margin:0;color:#bed0eb}.cta-actions{display:flex;gap:10px;flex-wrap:wrap}.zalo-outline{padding:13px 17px;background:#fff;color:#0876c7}.footer{margin-top:40px;background:#0b1220;color:#d7e1ef;padding:62px 0 22px}.footer-grid{display:grid;grid-template-columns:1.5fr .8fr .8fr 1fr;gap:38px}.footer-brand{color:#fff;margin-bottom:18px}.footer-copy{max-width:410px;color:#91a0b7;font-size:13px}.footer-grid>div:not(:first-child){display:flex;flex-direction:column;gap:9px}.footer-grid strong{font-size:12px;text-transform:uppercase;letter-spacing:1.1px;color:#fff;margin-bottom:6px}.footer-grid a,.footer-grid span{color:#91a0b7;text-decoration:none;font-size:13px}.footer-zalo{color:#84caff!important;font-weight:800}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.08);padding-top:18px;margin-top:42px;color:#74849c;font-size:11px}.floating-zalo{position:fixed;right:18px;bottom:18px;z-index:60;display:flex;align-items:center;gap:7px;padding:13px 14px;border-radius:999px;background:#0e92da;color:#fff;text-decoration:none;font-weight:900;box-shadow:0 16px 30px rgba(14,146,218,.32)}.floating-zalo span{font-size:12px}.search-highlight{outline:3px solid rgba(59,130,246,.22);outline-offset:3px}@media (max-width:980px){.desktop-nav{display:none}.menu-btn{display:block}.hero-grid{grid-template-columns:1fr;gap:40px}.hero-card-wrap{min-height:360px}.resource-grid{grid-template-columns:repeat(2,1fr)}.subject-grid{grid-template-columns:repeat(2,1fr)}.two-col{grid-template-columns:1fr}.article-grid{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}.nav-actions .zalo-btn{display:none}}@media (max-width:680px){.container{width:min(100% - 24px,1160px)}.topbar-inner{padding:8px 0;flex-direction:column;align-items:flex-start;gap:2px}.nav-wrap{height:68px}.brand-copy strong{font-size:16px}.hero{padding:54px 0 40px}h1{font-size:43px;letter-spacing:-2px}.hero-lead{font-size:15px}.hero-search{padding-left:14px}.hero-search button{padding:12px 14px}.hero-quick{flex-direction:column;align-items:stretch}.hero-trust{font-size:11px}.hero-card-wrap{min-height:340px}.hero-card{width:100%}.note-1{left:-2px;top:64px}.note-2{right:-2px;bottom:38px}.announcement-card{align-items:flex-start;flex-wrap:wrap}.announcement-copy{min-width:0}.announcement-copy strong{font-size:13px}.announcement-btn{width:100%;text-align:center}.stats-grid{grid-template-columns:repeat(2,1fr)}.section{padding:70px 0}.section-head{align-items:flex-start;flex-direction:column}.section-head h2{font-size:30px}.filter-row{justify-content:flex-start}.resource-grid,.article-grid,.category-grid{grid-template-columns:1fr}.subject-grid{grid-template-columns:1fr 1fr}.two-col h2{font-size:31px}.final-cta-card{padding:26px;flex-direction:column;align-items:flex-start}.cta-actions{width:100%}.cta-actions>*{flex:1}.footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column;gap:6px}.floating-zalo{right:12px;bottom:12px}}@media (max-width:420px){.subject-grid{grid-template-columns:1fr}.hero-search button{font-size:12px}.hero-search input{min-width:0}.hero-card-content h3{font-size:21px}.hero-stat-row strong{font-size:15px}}
@media (max-width:680px){.course-note{align-items:flex-start;flex-wrap:wrap}.course-note div{min-width:calc(100% - 52px)}.course-note a{margin-left:50px}.course-note strong{font-size:12px}.course-note small{font-size:10px}.subject-icon{width:44px!important;height:44px!important}.subject-icon svg{width:23px;height:23px}}

/* Unified vector icon system — no emoji UI icons */
.ui-icon{width:18px;height:18px;display:block;flex:none;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.topbar-brand{display:inline-flex;align-items:center;gap:8px}
.topbar-brand .ui-icon{width:15px;height:15px}
.zalo-btn .ui-icon,.zalo-outline .ui-icon,.floating-zalo .ui-icon{stroke-width:2}
.search-icon{display:grid;place-items:center;color:#6d7d94}
.search-icon .ui-icon{width:22px;height:22px}
.float-note{display:inline-flex;align-items:center;gap:8px}
.float-note .ui-icon{width:16px;height:16px}
.announcement-icon .ui-icon{width:21px;height:21px;color:#0d79cf}
.cat-icon .ui-icon{width:22px;height:22px}
.article-thumb{color:currentColor}
.article-icon{width:48px;height:48px}
.subject-icon{color:currentColor}
.subject-icon svg{stroke-width:2.8}

/* Premium subject + resource visuals */
.subject-grid{grid-template-columns:repeat(3,1fr);gap:16px}
.subject-card{position:relative;min-height:94px;padding:17px 16px;border-radius:20px;overflow:hidden}
.subject-card::after{content:"";position:absolute;width:110px;height:110px;border-radius:50%;right:-52px;top:-52px;background:var(--subject-soft);opacity:.55;pointer-events:none}
.subject-card>div{position:relative;z-index:1}
.subject-card .subject-icon-box{width:50px;height:50px;display:grid;place-items:center;border-radius:16px;flex:0 0 50px;color:var(--subject);background:var(--subject-soft);border:1px solid color-mix(in srgb,var(--subject) 12%,#fff);box-shadow:0 8px 18px color-mix(in srgb,var(--subject) 12%,transparent);}
.subject-icon-box svg{width:28px;height:28px;fill:none;stroke:currentColor;stroke-width:2.3;stroke-linecap:round;stroke-linejoin:round}
.subject-card strong{font-family:"Plus Jakarta Sans",sans-serif;font-size:14px;letter-spacing:-.2px}
.subject-card small{font-size:11px;color:#7a879b}
.subject-arrow{margin-left:auto;color:#9aabc1;font-size:17px;transition:.2s;position:relative;z-index:1}
.subject-card:hover .subject-arrow{color:var(--subject);transform:translateX(3px)}
.subject-blue{--subject:#3177ee;--subject-soft:#eaf3ff}.subject-rose{--subject:#e65f82;--subject-soft:#fff0f4}.subject-indigo{--subject:#6366d8;--subject-soft:#eff0ff}.subject-cyan{--subject:#159ab2;--subject-soft:#e9faff}.subject-orange{--subject:#ed8b34;--subject-soft:#fff4e7}.subject-green{--subject:#2ea66c;--subject-soft:#eafaf1}.subject-amber{--subject:#c99421;--subject-soft:#fff8df}.subject-violet{--subject:#885de0;--subject-soft:#f2edff}.subject-teal{--subject:#159a8c;--subject-soft:#e8fbf7}

.resource-thumb{height:166px;padding:16px;display:flex;align-items:center;justify-content:center;overflow:hidden;background:var(--resource-soft);position:relative}
.resource-thumb-pattern{position:absolute;inset:0;background:radial-gradient(circle at 15% 20%,rgba(255,255,255,.92),transparent 28%),radial-gradient(circle at 88% 75%,rgba(255,255,255,.58),transparent 30%);opacity:.9}
.resource-thumb::before{content:"";position:absolute;width:180px;height:180px;border-radius:50%;right:-70px;bottom:-100px;background:var(--resource-accent);opacity:.12}
.resource-thumb::after{content:"";position:absolute;width:130px;height:130px;border-radius:38px;left:-55px;top:-45px;background:var(--resource-accent);opacity:.08;transform:rotate(18deg)}
.resource-badge-row{position:absolute;top:12px;left:12px;right:12px;display:flex;align-items:center;justify-content:space-between;z-index:2}
.resource-type-badge{padding:6px 9px;border-radius:999px;background:rgba(255,255,255,.78);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.85);font-size:9px;font-weight:900;letter-spacing:.6px;color:#61708a}
.resource-badge{display:inline-flex;align-items:center;gap:4px;padding:7px 9px;border-radius:999px;background:rgba(255,255,255,.86);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.9);font-size:9px;font-weight:900;color:#3c6b56}
.badge-dot{width:6px;height:6px;border-radius:50%;display:inline-block}.badge-dot.hot{background:#ff8a3d;box-shadow:0 0 0 3px rgba(255,138,61,.12)}.badge-dot.free{background:#31b56a}
.resource-visual{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;gap:8px}
.resource-visual-icon{width:68px;height:68px;display:grid;place-items:center;border-radius:22px;background:rgba(255,255,255,.96);border:1px solid rgba(255,255,255,.98);box-shadow:0 18px 32px rgba(26,52,92,.12);color:var(--resource-accent)}
.resource-visual-icon svg{width:37px;height:37px;fill:none;stroke:currentColor;stroke-width:2.3;stroke-linecap:round;stroke-linejoin:round}
.resource-visual-label{font-size:10px;font-weight:900;letter-spacing:.7px;color:rgba(35,56,87,.72);text-transform:uppercase}
.resource-body{padding:18px 18px 17px}.resource-body h3{font-family:"Plus Jakarta Sans",sans-serif;font-size:17px;line-height:1.45;letter-spacing:-.3px;margin:2px 0 7px}.resource-body p{font-size:12px;line-height:1.65;margin:0 0 15px}.resource-footer{padding-top:4px}.resource-link{display:inline-flex;align-items:center;gap:4px}.resource-link span{transition:.2s}.resource-card:hover .resource-link span{transform:translateX(3px)}
.tone-blue{--resource-accent:#3678ef;--resource-soft:#edf5ff}.tone-rose{--resource-accent:#df607f;--resource-soft:#fff1f5}.tone-indigo{--resource-accent:#6267d8;--resource-soft:#f0f1ff}.tone-cyan{--resource-accent:#199db4;--resource-soft:#eafaff}.tone-orange{--resource-accent:#eb8a35;--resource-soft:#fff5e9}.tone-green{--resource-accent:#2eaa70;--resource-soft:#ecfbf3}.tone-amber{--resource-accent:#c99224;--resource-soft:#fff8e3}.tone-violet{--resource-accent:#895fe1;--resource-soft:#f3efff}.tone-teal{--resource-accent:#159b8d;--resource-soft:#eafbf8}

/* Better overall polish */
.section{scroll-margin-top:92px}.resource-card{box-shadow:0 12px 34px rgba(26,45,79,.045)}.resource-card:hover{transform:translateY(-6px);box-shadow:0 24px 56px rgba(26,45,79,.12)}
.stats-grid .stat{transition:.2s}.stats-grid .stat:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(26,45,79,.07)}
.announcement-card{box-shadow:0 12px 34px rgba(59,130,246,.06)}
@media (max-width:980px){.subject-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:680px){.subject-grid{grid-template-columns:1fr}.resource-thumb{height:158px}.resource-visual-icon{width:64px;height:64px}.resource-visual-icon svg{width:34px;height:34px}}

/* HDT v5 brand refinement */
.topbar{font-size:12px}
.topbar-zalo{display:inline-flex!important;align-items:center;gap:7px}
.topbar-zalo .ui-icon{width:14px;height:14px}
.zalo-btn{min-height:44px;padding:9px 12px}
.zalo-btn span{font-weight:800}
.zalo-btn small{font-size:10px;font-weight:900;opacity:.8;letter-spacing:.2px}
.brand-mark{position:relative;overflow:hidden}
.brand-mark::after{content:"";position:absolute;right:6px;top:5px;width:12px;height:12px;border-radius:50%;background:rgba(255,255,255,.28);filter:blur(2px)}
.hero{background:radial-gradient(circle at 76% 17%,rgba(81,128,255,.20),transparent 24%),radial-gradient(circle at 14% 10%,rgba(49,198,137,.10),transparent 18%),linear-gradient(180deg,#fcfeff 0%,#f4f7ff 100%)}
.hero-copy h1{max-width:790px}
.hero-copy h1 span{background:linear-gradient(90deg,#2563eb 8%,#6d5df5 56%,#b05fff 100%);-webkit-background-clip:text;background-clip:text}
.hero-trust span{display:inline-flex;align-items:center;gap:6px}
.hero-trust i{width:6px;height:6px;border-radius:50%;background:#37b86b;box-shadow:0 0 0 4px rgba(55,184,107,.10)}
.course-note{border-color:#d8e5f7;box-shadow:0 16px 38px rgba(36,71,120,.07)}
.course-note-badge{box-shadow:0 8px 20px rgba(70,78,219,.25)}
.resource-card,.category-card,.subject-card,.article-card,.stat{transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease}
.card-arrow,.subject-arrow,.arrow-icon{display:inline-flex;align-items:center;justify-content:center}
.card-arrow .ui-icon,.subject-arrow .ui-icon,.arrow-icon .ui-icon{width:15px;height:15px}
.category-card:hover .card-arrow{transform:translateX(4px)}
.subject-arrow{font-size:0}
.subject-arrow .ui-icon{width:16px;height:16px}
.subject-card:hover .subject-arrow{transform:translateX(3px)}
.resource-link .arrow-icon{transition:transform .18s ease}
.resource-card:hover .resource-link .arrow-icon{transform:translateX(3px)}
.primary-btn .arrow-icon{transition:transform .18s ease}
.primary-btn:hover .arrow-icon{transform:translateX(3px)}
.article-body>a{display:inline-flex;align-items:center;gap:5px}
.article-body>a .arrow-icon{transition:transform .18s ease}
.article-body>a:hover .arrow-icon{transform:translateX(3px)}
.subject-card .subject-icon-box{width:54px;height:54px;flex-basis:54px;border-radius:17px;box-shadow:0 10px 24px color-mix(in srgb,var(--subject) 11%,transparent)}
.subject-icon-box svg{width:30px;height:30px;stroke-width:2.15}
.resource-visual-icon{width:72px;height:72px;border-radius:21px;box-shadow:0 16px 34px rgba(26,52,92,.13)}
.resource-visual-icon svg{width:39px;height:39px;stroke-width:2.1}
.resource-badge{letter-spacing:.2px}
.final-cta-card{box-shadow:0 28px 66px rgba(18,38,73,.18)}
.floating-zalo{padding:14px 16px}
.floating-zalo::after{content:"";position:absolute;inset:-6px;border-radius:inherit;border:1px solid rgba(14,146,218,.14);animation:hdtPulse 2.5s ease-out infinite;pointer-events:none}
@keyframes hdtPulse{0%{transform:scale(.92);opacity:0}35%{opacity:1}100%{transform:scale(1.15);opacity:0}}
@media (max-width:680px){
  .topbar-inner{padding:7px 0}
  .topbar-zalo{font-size:11px}
  .nav-wrap{height:70px}
  .zalo-btn{display:none}
  .hero{padding-top:48px}
  .hero-copy h1{font-size:42px}
  .subject-card .subject-icon-box{width:48px;height:48px;flex-basis:48px}
  .subject-icon-box svg{width:27px;height:27px}
}

.resource-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.resource-download{display:inline-flex;align-items:center;justify-content:center;padding:7px 10px;border-radius:10px;background:#eff6ff;color:#1f63da;font-weight:800;font-size:11px;text-decoration:none;border:1px solid #dbeafe}.resource-download:hover{background:#e0edff}.muted-link{color:#8a98ad!important;cursor:default}.resource-card:hover .resource-download{transform:translateY(-1px)}
.subject-filter,.type-filter{cursor:pointer}
.subject-filter:focus-visible,.type-filter:focus-visible,.chip:focus-visible{outline:3px solid rgba(59,130,246,.25);outline-offset:3px}
.CSS

# copy instruction file updated
cat > README.md <<'MD'
# HDT Study
Website tĩnh cho tài liệu ôn thi THPT.

## Quản lý tài liệu
Website đã kết nối Google Sheets Published CSV. Bạn chỉ cần upload PDF lên Google Drive và thêm một dòng vào sheet `Documents`.

Các cột chính: `id`, `title`, `grade`, `subject`, `type`, `desc`, `fileUrl`, `fileSize`, `hot`, `featured`, `slug`, `publishedAt`.

## Chạy local
Mở `index.html` bằng Live Server trong VS Code.

## Cập nhật tài liệu
1. Upload PDF lên Google Drive.
2. Chia sẻ file: Bất kỳ ai có đường liên kết → Người xem.
3. Thêm một dòng vào Google Sheets.
4. Lưu sheet.
5. Reload website.
MD

# zip v10
cd /mnt/data/v10work && zip -qr /mnt/data/hdt-study-v10-data-driven.zip hdt-study
ls -lh /mnt/data/hdt-study-v10-data-driven.zip
.subject-filter,.type-filter{cursor:pointer}
.subject-filter:focus-visible,.type-filter:focus-visible,.chip:focus-visible{outline:3px solid rgba(59,130,246,.25);outline-offset:3px}

.sheet-status{display:inline-flex;align-items:center;gap:8px;margin-top:12px;padding:7px 11px;border:1px solid #e2e8f0;border-radius:999px;background:#fff;font-size:12px;font-weight:700;color:#64748b;box-shadow:0 6px 18px rgba(15,23,42,.05)}
.status-dot{width:8px;height:8px;border-radius:50%;background:#fbbf24;box-shadow:0 0 0 4px rgba(251,191,36,.14)}
.status-dot.is-live{background:#22c55e;box-shadow:0 0 0 4px rgba(34,197,94,.14)}
.status-dot.is-fallback{background:#fb7185;box-shadow:0 0 0 4px rgba(251,113,133,.14)}
@media (min-width:760px){.sheet-status{margin-left:4px}}

/* HDT v14 document detail modal */
body.modal-open{overflow:hidden}
.doc-modal{position:fixed;inset:0;z-index:1000;display:none;align-items:center;justify-content:center;padding:20px}
.doc-modal.is-open{display:flex}
.doc-modal-backdrop{position:absolute;inset:0;background:rgba(9,18,35,.56);backdrop-filter:blur(8px)}
.doc-modal-panel{position:relative;z-index:2;width:min(920px,100%);max-height:min(92vh,820px);overflow:auto;background:#fff;border:1px solid rgba(255,255,255,.5);border-radius:28px;box-shadow:0 36px 110px rgba(5,18,39,.28);display:grid;grid-template-columns:280px 1fr}
.doc-modal-close{position:absolute;right:16px;top:14px;width:40px;height:40px;border:1px solid #e2e8f0;border-radius:50%;background:rgba(255,255,255,.92);font-size:28px;line-height:1;color:#334155;cursor:pointer;z-index:3}
.doc-modal-visual{min-height:100%;padding:28px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:12px;background:var(--resource-soft,#eef5ff);color:var(--resource-accent,#3b82f6);position:relative;overflow:hidden}
.doc-modal-visual::before,.doc-modal-visual::after{content:"";position:absolute;border-radius:999px;background:currentColor;opacity:.08}.doc-modal-visual::before{width:220px;height:220px;right:-80px;bottom:-90px}.doc-modal-visual::after{width:150px;height:150px;left:-70px;top:-70px}
.doc-modal-visual .resource-visual-icon{width:110px;height:110px;border-radius:30px;position:relative;z-index:1}.doc-modal-visual .resource-visual-icon svg{width:58px;height:58px}.doc-modal-visual>span:last-child{font-size:12px;font-weight:900;letter-spacing:.8px;text-transform:uppercase;color:#52637b;position:relative;z-index:1}
.doc-modal-visual.tone-blue{--resource-accent:#3678ef;--resource-soft:#edf5ff}.doc-modal-visual.tone-rose{--resource-accent:#df607f;--resource-soft:#fff1f5}.doc-modal-visual.tone-indigo{--resource-accent:#6267d8;--resource-soft:#f0f1ff}.doc-modal-visual.tone-cyan{--resource-accent:#199db4;--resource-soft:#eafaff}.doc-modal-visual.tone-orange{--resource-accent:#eb8a35;--resource-soft:#fff5e9}.doc-modal-visual.tone-green{--resource-accent:#2eaa70;--resource-soft:#ecfbf3}.doc-modal-visual.tone-amber{--resource-accent:#c99224;--resource-soft:#fff8e3}.doc-modal-visual.tone-violet{--resource-accent:#895fe1;--resource-soft:#f3efff}.doc-modal-visual.tone-teal{--resource-accent:#159b8d;--resource-soft:#eafbf8}
.doc-modal-content{padding:34px 36px 32px}.doc-modal-meta{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 12px}.doc-modal-meta span{padding:6px 9px;border-radius:999px;background:#f1f5f9;color:#64748b;font-size:11px;font-weight:800}.doc-modal-content h2{font-size:30px;line-height:1.2;letter-spacing:-.5px;margin:0 0 12px}.doc-modal-content>p{font-size:14px;line-height:1.75;color:#64748b;margin:0 0 20px}.doc-modal-details{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:22px}.doc-modal-details>div{padding:12px 13px;border:1px solid #e6edf5;border-radius:14px;background:#fbfdff}.doc-modal-details span{display:block;font-size:10px;color:#94a3b8;margin-bottom:4px}.doc-modal-details strong{font-size:12px;color:#23314a}.doc-modal-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.doc-modal-actions .primary-btn,.doc-modal-actions .secondary-btn,.doc-copy-btn{min-height:46px}.doc-modal-note{margin-top:16px;font-size:11px;line-height:1.6;color:#94a3b8}
.resource-card{cursor:pointer}.resource-card:focus-visible{outline:3px solid rgba(59,130,246,.22);outline-offset:4px}.resource-detail-btn{border:0;background:none;padding:0;font:inherit;cursor:pointer;color:#2c6be6;font-weight:800}.resource-detail-btn:hover{text-decoration:underline}
@media (max-width:760px){.doc-modal{padding:10px}.doc-modal-panel{grid-template-columns:1fr;border-radius:22px;max-height:94vh}.doc-modal-visual{min-height:180px;padding:22px}.doc-modal-visual .resource-visual-icon{width:82px;height:82px;border-radius:24px}.doc-modal-visual .resource-visual-icon svg{width:44px;height:44px}.doc-modal-content{padding:24px 20px}.doc-modal-content h2{font-size:24px}.doc-modal-details{grid-template-columns:1fr 1fr}.doc-modal-actions>*{flex:1 1 100%;justify-content:center;text-align:center}.doc-modal-close{right:12px;top:10px}}

.sheet-status-wrap{display:inline-flex;align-items:center;gap:8px;vertical-align:middle;margin-left:12px}
.sync-btn{border:1px solid #dbe4f1;background:#fff;color:#41516a;border-radius:999px;padding:6px 10px;font:600 12px/1 inherit;cursor:pointer;transition:.2s ease;box-shadow:0 2px 8px rgba(24,43,73,.05)}
.sync-btn:hover{border-color:#a9c2e8;background:#f8fbff;transform:translateY(-1px)}
.sync-btn:disabled{opacity:.65;cursor:wait;transform:none}
@media (max-width:700px){.sheet-status-wrap{display:flex;margin:10px 0 0}.sync-btn{padding:7px 11px}}
/* HDT v16: dedicated detail page navigation */
.resource-card{cursor:pointer}
.resource-card:focus-visible{outline:3px solid rgba(37,99,235,.22);outline-offset:4px}