:root{--blue:#075ee8;--navy:#05275d;--ink:#071c43;--muted:#5e6b82;--line:#e5ebf4;--bg:#f6f9fd;--radius:16px;--shadow:0 8px 24px rgba(16,48,95,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:Inter,"Segoe UI",Arial,sans-serif;background:#fff;line-height:1.6}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.header-inner{height:72px;max-width:1440px;margin:auto;padding:0 32px;display:flex;align-items:center;gap:30px}.brand img,.custom-logo{display:block;max-height:54px;width:auto}.main-nav{margin-left:auto}.main-nav ul{display:flex;align-items:center;gap:32px;list-style:none;margin:0;padding:0}.main-nav a{font-size:13px;font-weight:800}.main-nav a:hover{color:var(--blue)}.header-actions{display:flex;gap:12px;align-items:center}.search-link{font-size:26px}.menu-toggle{display:none;border:0;background:none;font-size:24px}.btn{display:inline-flex;align-items:center;justify-content:center;background:var(--blue);color:#fff!important;padding:13px 22px;border-radius:9px;font-weight:800;box-shadow:0 7px 18px rgba(7,94,232,.2)}.btn.small{padding:9px 16px;font-size:13px}.btn.secondary{background:#fff;color:var(--blue)!important;border:1px solid var(--line)}.btn.white{background:#fff;color:var(--navy)!important}.hero{max-width:1360px;margin:auto;min-height:390px;padding:55px 55px 30px;display:grid;grid-template-columns:1.1fr .9fr;align-items:center;background:linear-gradient(110deg,#fff 45%,#eef6ff)}.hero h1{font-size:56px;line-height:1;margin:0 0 15px;letter-spacing:-2px}.hero h2{font-size:22px;color:var(--blue);margin:0 0 18px}.hero p{max-width:470px;font-size:17px}.hero-actions{display:flex;gap:14px;margin-top:28px}.physics-art{height:290px;position:relative;font-size:100px;display:flex;align-items:center;justify-content:center;gap:25px;color:var(--blue)}.physics-art .magnet{font-size:90px}.physics-art .pendulum{font-size:50px;color:#253a55}.quick-grid{max-width:1280px;margin:0 auto 30px;padding:0 30px;display:grid;grid-template-columns:repeat(6,1fr);gap:16px}.quick-card{padding:24px 15px;text-align:center;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);background:#fff}.quick-card>div{font-size:38px}.quick-card h3{font-size:14px;margin:10px 0 4px}.quick-card p{font-size:12px;color:var(--muted);margin:0}.hatquiz-panel{max-width:1280px;margin:30px auto;padding:28px 35px;border-radius:14px;background:linear-gradient(120deg,#06285d,#00489d);color:#fff;display:grid;grid-template-columns:1.3fr repeat(4,1fr);gap:14px}.hatquiz-intro h2{font-size:34px;margin:0}.hatquiz-intro h3{margin:0 0 12px}.hatquiz-intro em{color:#ff9f2d;font-style:normal}.feature{background:rgba(255,255,255,.06);border-radius:10px;padding:18px}.feature>b{font-size:35px}.feature h3{font-size:13px}.feature p{font-size:12px;opacity:.9}.curriculum{max-width:1280px;margin:35px auto;padding:0 30px;text-align:center}.curriculum h2{font-size:22px}.grade-tabs{display:flex;justify-content:center;gap:12px;margin-bottom:18px}.grade-tabs button{border:1px solid var(--line);background:#fff;padding:10px 24px;border-radius:8px;font-weight:700;color:var(--ink)}.grade-tabs button.active{background:var(--blue);color:#fff}.grade-panel{display:none;text-align:left;border:1px solid var(--line);border-radius:14px;padding:24px;background:#fff;box-shadow:var(--shadow)}.grade-panel.active{display:block}.grade-panel ol{columns:2;column-gap:45px;padding-left:26px}.grade-panel li{padding:7px}.grade-panel a:hover{color:var(--blue)}.study-links{color:var(--blue);font-weight:700;font-size:13px}.explore{max-width:1280px;margin:40px auto;padding:28px 30px;background:#f6faff;border-radius:16px}.explore h2{margin-bottom:0}.explore>p{margin-top:0;color:var(--muted)}.posts-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.post-card{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}.post-card img{width:100%;aspect-ratio:16/9;object-fit:cover}.post-card h2,.post-card h3,.post-card p,.post-card span{margin-left:16px;margin-right:16px}.post-card h3{font-size:17px}.post-card p{font-size:14px;color:var(--muted)}.post-card span{display:block;color:var(--blue);font-weight:700;margin-bottom:16px}.article-shell{max-width:1180px;margin:0 auto;padding:34px 30px 70px}.breadcrumbs{font-size:14px;color:#65748d;display:flex;gap:11px;flex-wrap:wrap;margin:0 0 20px}.breadcrumbs a:hover{color:var(--blue)}.article-header h1{font-size:42px;line-height:1.18;letter-spacing:-.8px;margin:0 0 28px}.article-content{font-size:17px;color:#17243a}.article-content>*{max-width:100%}.article-content h2{font-size:28px;color:var(--navy);margin-top:42px}.article-content h3{font-size:22px}.article-content p{margin:0 0 1.15em}.article-content img{border-radius:10px}.article-content pre,.article-content code{max-width:100%;overflow:auto}.article-content iframe{max-width:100%}.article-content .alignwide{width:min(1320px,calc(100vw - 40px));max-width:none;margin-left:50%;transform:translateX(-50%)}.article-content .alignfull{width:100vw;max-width:none;margin-left:50%;transform:translateX(-50%)}.listing{max-width:1280px;margin:auto;padding:50px 30px}.empty{text-align:center;padding:100px 20px}.empty h1{font-size:80px;margin:0}.site-footer{background:linear-gradient(110deg,#06295e,#001c45);color:#fff;padding:42px 30px 20px}.footer-grid{max-width:1280px;margin:auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:50px}.footer-logo{max-width:150px;background:#fff;border-radius:6px;padding:4px}.footer-grid p{font-size:13px;opacity:.8;max-width:280px}.footer-grid h4{margin:0 0 10px}.footer-grid a{display:block;font-size:13px;opacity:.85;margin:5px 0}.copyright{text-align:center;opacity:.65;font-size:12px;margin-top:28px}.mobile-bottom{display:none}
@media(max-width:900px){body{padding-bottom:64px}.header-inner{height:62px;padding:0 16px}.brand img,.custom-logo{max-height:42px;max-width:120px}.menu-toggle{display:block;margin-left:auto}.main-nav{display:none;position:absolute;top:62px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:16px}.main-nav.open{display:block}.main-nav ul{display:block}.main-nav li{padding:10px}.header-actions .btn{display:none}.hero{display:block;padding:35px 20px;text-align:center}.hero h1{font-size:34px}.hero h2{font-size:15px}.hero p{font-size:14px;margin:auto}.physics-art{height:160px;font-size:60px}.physics-art .magnet{font-size:55px}.physics-art .pendulum{font-size:30px}.hero-actions{display:grid}.quick-grid{grid-template-columns:repeat(3,1fr);padding:0 16px;gap:9px}.quick-card{padding:16px 7px}.quick-card>div{font-size:28px}.quick-card p{display:none}.hatquiz-panel{margin:20px 16px;padding:22px;display:grid;grid-template-columns:repeat(4,1fr);gap:8px;text-align:center}.hatquiz-intro{grid-column:1/-1}.hatquiz-intro h2{font-size:27px}.feature{padding:10px 5px}.feature>b{font-size:25px}.feature h3{font-size:9px}.feature p{display:none}.curriculum{padding:0 16px}.grade-tabs button{padding:8px 14px}.grade-panel ol{columns:1}.posts-grid{grid-template-columns:repeat(2,1fr)}.article-shell{padding:24px 18px 50px}.article-header h1{font-size:30px}.article-content{font-size:16px}.footer-grid{grid-template-columns:1fr 1fr}.mobile-bottom{position:fixed;z-index:60;bottom:0;left:0;right:0;height:64px;background:#fff;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(5,1fr);align-items:center;text-align:center}.mobile-bottom a{font-size:18px;color:#355071}.mobile-bottom span{display:block;font-size:9px}.hatquiz-mobile{color:var(--blue)!important;font-size:26px!important}}
@media(max-width:560px){.posts-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.quick-card h3{font-size:11px}.article-content .alignwide{width:100%;margin-left:0;transform:none}}

/* ===== Content Hub / Trang lọc ===== */
.gvv-hub{max-width:1240px;margin:0 auto;padding:48px 22px 70px}.hub-heading{margin-bottom:24px}.hub-heading h1{margin:4px 0 6px;color:#0b2454;font-size:clamp(28px,4vw,42px)}.hub-heading p{margin:0;color:#6d7890}.hub-kicker{font-weight:800!important;letter-spacing:.12em;color:#0b63e5!important;font-size:13px}.filter-panel{border:1px solid #dfe7f2;border-radius:20px;padding:24px;background:#fff;box-shadow:0 12px 35px rgba(11,36,84,.05)}.filter-title{font-size:13px;font-weight:900;letter-spacing:.13em;color:#0b63e5;margin-bottom:16px}.topic-tabs{display:flex;gap:10px;flex-wrap:wrap;padding-bottom:20px;border-bottom:1px solid #e8edf5}.topic-tab{display:inline-flex;gap:7px;align-items:center;min-height:44px;padding:0 17px;border:1px solid #dce4ef;border-radius:12px;color:#35435d;font-weight:800;background:#fff;text-decoration:none;transition:.2s}.topic-tab span{color:#9aa6b9}.topic-tab:hover{border-color:#80b2f4;color:#075ccf}.topic-tab.active{background:#075fcf;color:#fff;border-color:#075fcf;box-shadow:0 7px 18px rgba(7,95,207,.18)}.topic-tab.active span{color:#dceaff}.filter-tools{display:grid;grid-template-columns:1fr auto;gap:12px;margin:16px 0 20px}
.select-tabs{display:block;padding-bottom:14px}.topic-select-wrap{max-width:340px}.topic-select{width:100%;border:0;outline:0;background:transparent;font:inherit;font-weight:700;color:#35435d;padding:0 4px}.select-wrap,.search-wrap{height:48px;border:1px solid #d9e2ef;border-radius:13px;display:flex;align-items:center;background:#fff}.select-wrap{padding:0 12px}.select-wrap select{width:100%;border:0;outline:0;background:transparent;font:inherit;font-weight:700;color:#35435d}.filter-icon{font-size:11px;color:#075fcf;margin-right:7px}.search-wrap{padding:0 16px;gap:10px}.search-wrap span{font-size:24px;color:#075fcf}.search-wrap input{width:100%;border:0;outline:0;font:inherit;color:#26334b}.filter-submit{border:0;border-radius:12px;padding:0 24px;background:#075fcf;color:#fff;font-weight:800;cursor:pointer}.hub-table-wrap{overflow:auto;border-radius:15px;border:1px solid #e1e7f0}.hub-table{width:100%;border-collapse:collapse;min-width:1000px}.hub-table th{background:#082e68;color:#fff;text-align:left;padding:16px 18px;font-size:12px;letter-spacing:.08em}.hub-table th:first-child{width:70px}.hub-table td{padding:16px 18px;border-bottom:1px solid #e6ebf3;border-right:1px solid #eef2f7;color:#26334b;vertical-align:middle}.hub-table tr:last-child td{border-bottom:0}.hub-table tbody tr:hover{background:#f7faff}.row-no{font-family:monospace;color:#71809a}.post-name{font-weight:750;color:#162a4e;text-decoration:none}.post-name:hover,.excerpt-link:hover{color:#075fcf}.excerpt-link{display:block;max-width:360px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:#4e5e78;text-decoration:none}.type-pill{display:inline-flex;align-items:center;padding:6px 11px;border-radius:999px;background:#eaf3ff;border:1px solid #b8d5ff;color:#075fcf;font-size:12px;font-weight:800}.type-pill.neutral{background:#f3f5f8;border-color:#dfe4eb;color:#68758b}.hub-table em{color:#71809a;font-weight:650}.empty-state{text-align:center!important;padding:44px!important;color:#71809a!important}.hub-pagination{display:flex;justify-content:center;gap:7px;margin-top:20px}.hub-pagination a{width:38px;height:38px;border:1px solid #dce4ef;border-radius:10px;display:grid;place-items:center;text-decoration:none;color:#355071;font-weight:800}.hub-pagination a.active{background:#075fcf;color:#fff;border-color:#075fcf}
@media(max-width:760px){.gvv-hub{padding:28px 14px 88px}.filter-panel{padding:15px;border-radius:16px}.topic-tabs{flex-wrap:nowrap;overflow-x:auto;padding-bottom:14px;scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch}.topic-tab{white-space:nowrap;min-height:40px;padding:0 13px;scroll-snap-align:start}.select-tabs{overflow-x:visible}.topic-select-wrap{max-width:none}.filter-tools{grid-template-columns:1fr}.filter-submit{height:46px}.hub-table-wrap{border:0;overflow:visible}.hub-table{min-width:0}.hub-table thead{display:none}.hub-table,.hub-table tbody,.hub-table tr,.hub-table td{display:block;width:100%}.hub-table tr{border:1px solid #e1e7f0;border-radius:14px;margin-bottom:12px;padding:10px 12px;background:#fff;box-shadow:0 5px 18px rgba(11,36,84,.04)}.hub-table td{border:0;padding:6px 0;display:grid;grid-template-columns:88px 1fr;gap:10px}.hub-table td:before{content:attr(data-label);font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:#8b98ac;font-weight:800}.excerpt-link{max-width:none;white-space:normal}.hub-table td:first-child{display:none}}
/* v1.2 content library */
.chapter-tabs{display:flex;gap:8px;flex-wrap:wrap;padding:14px 0 2px}.chapter-tab{padding:8px 12px;border-radius:10px;background:#f5f8fd;border:1px solid #dfe7f2;color:#3d4f6d;text-decoration:none;font-size:13px;font-weight:750}.chapter-tab:hover,.chapter-tab.active{background:#eaf3ff;border-color:#9cc6ff;color:#075fcf}.result-count{margin:-5px 0 12px;color:#74829a;font-size:13px}.result-count strong{color:#0b2454}.excerpt-link.external{color:#1267e8;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.grade-tabs{margin-bottom:0}
@media(max-width:760px){.chapter-tabs{flex-wrap:nowrap;overflow-x:auto}.chapter-tab{white-space:nowrap}}

.ui-icon{width:1.25em;height:1.25em;display:inline-block;vertical-align:-.18em;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.menu-toggle .ui-icon,.search-link .ui-icon{width:24px;height:24px}.mobile-bottom .ui-icon{display:block;margin:0 auto 2px;width:21px;height:21px}.hatquiz-mobile .ui-icon{width:27px;height:27px;fill:currentColor;stroke:none}.article-meta{display:flex;align-items:center;gap:7px;margin:-16px 0 26px;color:var(--muted);font-size:14px}.article-meta .ui-icon{width:18px;height:18px}

/* ===== GVV HAT Theme v1.0 ===== */
:root{--blue:#087f8c;--navy:#123a63;--ink:#102a43;--muted:#65758b;--line:#e3ebf0;--bg:#f5f9fa;--accent:#0aa6a6;--radius:16px;--shadow:0 10px 30px rgba(16,42,67,.08)}
.ui-icon,.home-icon{width:1.35em;height:1.35em;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.brand-text{display:grid;line-height:1}.brand-text strong{font-size:18px;letter-spacing:.08em;color:var(--navy)}.brand-text b{font-size:24px;letter-spacing:.12em;color:var(--blue)}.brand-text small{font-size:8px;margin-top:4px;color:var(--muted);letter-spacing:.04em}.main-nav ul{gap:24px}.main-nav a{font-size:12px;letter-spacing:.02em}.btn{background:var(--blue);box-shadow:0 7px 18px rgba(8,127,140,.18)}
.gvv-home{overflow:hidden}.gvv-hero{max-width:1360px;margin:auto;min-height:470px;padding:70px 55px 55px;display:grid;grid-template-columns:1.12fr .88fr;align-items:center;gap:50px;background:radial-gradient(circle at 90% 20%,#e5f8f7 0,transparent 34%),linear-gradient(120deg,#fff 55%,#f4fbfb)}.eyebrow,.section-kicker{display:block;color:var(--blue);font-size:12px;font-weight:900;letter-spacing:.16em}.gvv-hero h1{font-size:clamp(42px,5.2vw,70px);line-height:.98;letter-spacing:-.045em;margin:10px 0 14px;color:var(--navy)}.gvv-hero h2{font-size:22px;margin:0 0 16px;color:var(--blue)}.gvv-hero p{max-width:650px;color:var(--muted);font-size:17px}.hero-search{max-width:700px;margin-top:28px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;border:1px solid #d8e6e8;border-radius:14px;background:#fff;padding:7px 7px 7px 15px;box-shadow:0 12px 35px rgba(16,42,67,.08)}.hero-search svg{color:var(--muted);font-size:18px}.hero-search input{border:0;outline:0;padding:11px 12px;font:inherit;min-width:0}.hero-search button{border:0;border-radius:9px;background:var(--blue);color:#fff;padding:12px 18px;font-weight:800;cursor:pointer}.hero-chips{display:flex;gap:9px;flex-wrap:wrap;margin-top:13px;align-items:center;font-size:12px;color:var(--muted)}.hero-chips a{padding:5px 10px;border-radius:999px;background:#eef8f8;color:#27636a;font-weight:700}.teacher-art{display:flex;justify-content:center}.art-window{width:min(430px,100%);min-height:310px;border:1px solid #d9e8eb;border-radius:24px;background:#fff;box-shadow:0 30px 70px rgba(16,42,67,.13);padding:25px;transform:rotate(1.5deg)}.art-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#dce7ea;margin-right:5px}.art-title{margin:28px 0 18px;font-weight:900;color:var(--navy);font-size:14px;letter-spacing:.12em}.art-row{display:grid;grid-template-columns:55px 1fr;gap:14px;align-items:center;margin:12px 0}.art-row b{font-size:11px;color:var(--blue);background:#e9f7f7;padding:8px;border-radius:8px;text-align:center}.art-row i{height:9px;border-radius:9px;background:linear-gradient(90deg,#d9e7ec 72%,#f2f6f7 72%)}.art-chart{height:82px;margin-top:26px;display:flex;gap:12px;align-items:end;border-bottom:1px solid var(--line);padding:0 15px}.art-chart span{flex:1;background:#b9dedf;border-radius:6px 6px 0 0}.art-chart span:nth-child(1){height:38%}.art-chart span:nth-child(2){height:68%}.art-chart span:nth-child(3){height:50%}.art-chart span:nth-child(4){height:88%}
.gvv-section{max-width:1280px;margin:0 auto;padding:55px 30px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:24px}.section-head h2,.audience-copy h2{font-size:30px;line-height:1.15;margin:5px 0;color:var(--navy)}.section-head>a{color:var(--blue);font-weight:800;font-size:13px}.gvv-quick-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.gvv-quick-card{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:14px;border:1px solid var(--line);border-radius:14px;padding:18px;background:#fff;transition:.2s}.gvv-quick-card:hover{transform:translateY(-2px);border-color:#a7d6d8;box-shadow:var(--shadow)}.icon-box{display:grid;place-items:center;width:48px;height:48px;border-radius:12px;background:#eaf7f7;color:var(--blue);font-size:24px}.gvv-quick-card strong,.gvv-quick-card small{display:block}.gvv-quick-card strong{font-size:13px;color:var(--navy)}.gvv-quick-card small{font-size:12px;color:var(--muted);margin-top:2px}.gvv-quick-card .arrow{color:#9bb1bd}.latest-section{background:#f7fafb;max-width:none}.latest-section>.section-head,.latest-section>.gvv-post-grid{max-width:1220px;margin-left:auto;margin-right:auto}.gvv-post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.gvv-post-card{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden}.post-thumb{display:block;aspect-ratio:16/8.5;background:#edf6f7;overflow:hidden}.post-thumb img{width:100%;height:100%;object-fit:cover}.thumb-placeholder{height:100%;display:grid;place-items:center;color:#75b9bd;font-size:44px}.post-body{padding:18px}.post-meta{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:11px}.post-meta span{color:var(--blue);font-weight:800;text-transform:uppercase}.gvv-post-card h3{font-size:18px;line-height:1.35;margin:10px 0}.gvv-post-card p{font-size:13px;color:var(--muted)}.read-more{font-size:12px;color:var(--blue);font-weight:800}.audience-section{display:grid;grid-template-columns:.8fr 1.2fr;gap:50px;align-items:center}.audience-copy p{color:var(--muted)}.audience-links{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.audience-links a{min-height:150px;padding:20px;border:1px solid var(--line);border-radius:16px;background:linear-gradient(145deg,#fff,#f1f9f9);display:flex;flex-direction:column;justify-content:space-between}.audience-links span{font-weight:900;color:var(--navy);font-size:18px}.audience-links b{font-size:12px;color:var(--blue)}.hatquiz-product{max-width:1220px;margin:20px auto 60px;border-radius:24px;background:linear-gradient(120deg,#123a63,#087f8c);color:#fff;display:grid;grid-template-columns:1fr 1.2fr;gap:35px;align-items:center;padding:38px 42px}.hatquiz-product h2{font-size:38px;margin:4px 0}.hatquiz-product h3{font-size:19px;margin:0}.hatquiz-product p{opacity:.84}.product-label{font-size:11px;letter-spacing:.15em;font-weight:900;color:#bcefee}.product-flow{display:flex;align-items:center;justify-content:center;gap:9px;flex-wrap:wrap}.product-flow span{background:rgba(255,255,255,.11);border:1px solid rgba(255,255,255,.17);padding:12px;border-radius:10px;font-size:11px;font-weight:900}.product-flow i{font-style:normal;opacity:.6}
.site-footer{background:linear-gradient(110deg,#123a63,#082b48)}.footer-brand strong,.footer-brand b{color:#fff}.footer-brand small{color:#b8d0dd}.footer-logo{background:none}.gvv-hub{max-width:1240px;margin:0 auto;padding:30px 22px 70px}.filter-panel{border-radius:16px}.topic-tab.active,.filter-submit{background:var(--blue)!important;border-color:var(--blue)!important}.type-pill{background:#e8f6f6!important;color:#17666c!important}
@media(max-width:900px){.gvv-hero{display:block;padding:42px 20px 36px;text-align:left}.gvv-hero h1{font-size:42px}.gvv-hero h2{font-size:17px}.teacher-art{display:none}.hero-search{grid-template-columns:auto 1fr}.hero-search button{display:none}.gvv-section{padding:38px 16px}.gvv-quick-grid{grid-template-columns:repeat(2,1fr)}.gvv-post-grid{grid-template-columns:repeat(2,1fr)}.audience-section{grid-template-columns:1fr}.hatquiz-product{margin:12px 16px 30px;grid-template-columns:1fr;padding:28px 22px}.header-actions .btn{display:none}}
@media(max-width:560px){.gvv-quick-grid{grid-template-columns:1fr}.gvv-post-grid{grid-template-columns:1fr}.audience-links{grid-template-columns:1fr}.audience-links a{min-height:100px}.section-head h2,.audience-copy h2{font-size:25px}.brand-text strong{font-size:13px}.brand-text b{font-size:19px}.brand-text small{display:none}}

/* v1.0.1 — official lotus logo, responsive + optimized WebP */
.brand{display:flex;align-items:center;flex:0 0 auto}.gvv-logo-picture{display:block;line-height:0}.gvv-logo-header{display:block;width:220px;height:auto;max-height:58px;object-fit:contain;object-position:left center}.footer-brand.gvv-logo-full{display:block;width:min(360px,100%);height:auto;max-width:100%;background:rgba(255,255,255,.96);border-radius:12px;padding:8px}.footer-grid>div:first-child{min-width:0}
@media(max-width:1180px){.gvv-logo-header{width:185px}.header-inner{gap:18px}.main-nav ul{gap:16px}.main-nav a{font-size:11px}}
@media(max-width:900px){.gvv-logo-header{width:48px;height:48px;max-height:48px;object-fit:contain}.brand{width:50px}.header-inner{gap:10px}.footer-brand.gvv-logo-full{width:min(320px,100%)}}
@media(max-width:560px){.gvv-logo-header{width:44px;height:44px;max-height:44px}.brand{width:46px}.footer-brand.gvv-logo-full{width:100%;max-width:300px}}

/* v1.0.2 — Lotus brand palette: harmonized with official GiaovienViet logo */
:root{
  --blue:#078fa0;
  --navy:#073f7a;
  --ink:#123653;
  --muted:#64778b;
  --line:#dce9ee;
  --bg:#f5fafb;
  --accent:#10b8bd;
  --lotus:#ef4f8a;
  --lotus-soft:#fff0f6;
  --gold:#f5a623;
  --shadow:0 10px 30px rgba(7,63,122,.08)
}
.site-header{border-bottom-color:#dce9ee;box-shadow:0 3px 16px rgba(7,63,122,.035)}
.main-nav a:hover,.search-link:hover{color:var(--blue)}
.btn,.hero-search button,.filter-submit,.topic-tab.active{background:linear-gradient(135deg,#087f98,#10aeb1)!important;box-shadow:0 7px 18px rgba(8,143,160,.18)}
.btn.secondary{background:#fff!important;color:var(--navy)!important;border-color:#cfe3e8}
.gvv-hero{background:radial-gradient(circle at 90% 18%,#e8fbfb 0,transparent 32%),radial-gradient(circle at 76% 8%,#fff0f6 0,transparent 17%),linear-gradient(120deg,#fff 55%,#f4fbfc)}
.hero-chips a{background:#eaf8f9;color:#176874}.hero-chips a:hover{background:var(--lotus-soft);color:#b72e64}
.art-window{border-color:#d5e9ed;box-shadow:0 30px 70px rgba(7,63,122,.12)}
.art-row b,.icon-box{background:#e9f8f9;color:#078998}.art-chart span{background:#9edfe0}.art-chart span:nth-child(4){background:linear-gradient(180deg,#ef7eaa,#ef4f8a)}
.gvv-quick-card:hover{border-color:#83cfd3;box-shadow:0 12px 30px rgba(7,63,122,.09)}
.latest-section{background:#f6fafb}.post-thumb{background:#edf8f8}.thumb-placeholder{color:#67bfc3}
.audience-links a{background:linear-gradient(145deg,#fff,#f1fafb)}
.hatquiz-product{background:linear-gradient(120deg,#073f7a 0%,#086d8c 55%,#079aa2 100%);box-shadow:0 18px 44px rgba(7,63,122,.15)}
.product-label{color:#c9f7f4}.product-flow span{border-color:rgba(255,255,255,.22)}
.site-footer{background:linear-gradient(115deg,#073f7a,#062d59 70%,#07294d)}
.mobile-bottom a{color:#42627b}.mobile-bottom a:hover,.hatquiz-mobile{color:var(--blue)!important}
.hub-heading h1,.result-count strong{color:var(--navy)}.hub-kicker,.filter-title{color:var(--blue)!important}
.topic-tab:hover{border-color:#82ced2;color:#087f8c}.type-pill{background:#e8f8f8!important;border-color:#b9e4e5!important;color:#176b72!important}
.chapter-tab:hover,.chapter-tab.active{background:#eaf8f9;border-color:#99d8db;color:#087f8c}.excerpt-link.external{color:#087f8c}
/* Lotus pink is intentionally limited to tiny brand accents so content remains calm/readable. */
.section-kicker:before,.eyebrow:before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--lotus);margin-right:8px;vertical-align:1px}
@media(max-width:900px){.site-header{background:rgba(255,255,255,.98)}.mobile-bottom{box-shadow:0 -4px 18px rgba(7,63,122,.06)}}

/* v1.0.3 — Clean lotus footer: light, readable, no icon/label strip */
.site-footer{position:relative;background:linear-gradient(180deg,#ffffff 0%,#f7fbfc 100%);color:var(--ink);padding:54px 30px 0;border-top:1px solid #dce9ee;overflow:hidden}
.site-footer:before{content:"";position:absolute;left:-90px;bottom:42px;width:380px;height:170px;background:radial-gradient(ellipse at 50% 100%,rgba(239,79,138,.10),transparent 66%);pointer-events:none}
.footer-grid{position:relative;z-index:1;max-width:1280px;margin:auto;display:grid;grid-template-columns:minmax(330px,1.8fr) repeat(3,minmax(150px,1fr));gap:52px;align-items:start}
.footer-identity{min-width:0}.footer-clean-logo{display:block;max-width:480px;line-height:0}.footer-clean-logo img{display:block;width:100%;height:auto;object-fit:contain;object-position:left top}.footer-identity p{max-width:420px;margin:16px 0 0;color:#60758a;font-size:13px;line-height:1.7}
.footer-grid h4{position:relative;margin:8px 0 20px;color:var(--navy);font-size:15px;font-weight:900}.footer-grid h4:after{content:"";display:block;width:30px;height:2px;margin-top:9px;border-radius:3px;background:var(--accent)}.footer-grid>div:nth-child(3) h4:after{background:var(--lotus)}.footer-grid>div:nth-child(4) h4:after{background:var(--gold)}
.footer-grid a:not(.footer-clean-logo){display:block;width:max-content;max-width:100%;margin:10px 0;color:#2e4b64;font-size:13px;opacity:1;transition:.18s ease}.footer-grid a:not(.footer-clean-logo):hover{color:var(--blue);transform:translateX(2px)}
.copyright{position:relative;z-index:1;margin:48px -30px 0;padding:17px 30px;background:linear-gradient(100deg,#073f7a,#07547d);color:rgba(255,255,255,.88);font-size:11px;text-align:center;display:flex;justify-content:center;gap:28px}.copyright span+span:before{content:"•";margin-right:28px;color:#59d1d1}
@media(max-width:900px){.site-footer{padding:38px 20px 0}.footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:30px}.footer-identity{grid-column:1/-1;display:grid;grid-template-columns:minmax(220px,360px) 1fr;gap:25px;align-items:center}.footer-identity p{margin:0}.footer-clean-logo{max-width:360px}.copyright{margin:34px -20px 0;padding:15px 20px}}
@media(max-width:560px){.site-footer{padding:28px 18px 0}.footer-grid{grid-template-columns:1fr 1fr;gap:24px 26px}.footer-identity{grid-column:1/-1;display:block;text-align:center;border-bottom:1px solid var(--line);padding-bottom:22px}.footer-clean-logo{max-width:320px;margin:0 auto}.footer-identity p{display:none}.footer-grid>div:nth-child(4){grid-column:1/-1}.footer-grid h4{font-size:13px;margin:0 0 13px}.footer-grid h4:after{margin-top:6px}.footer-grid a:not(.footer-clean-logo){font-size:12px;margin:8px 0}.copyright{margin:26px -18px 0;padding:13px 18px;display:block;line-height:1.7}.copyright span{display:block}.copyright span+span:before{display:none}}