/* ===== home page layout ===== */
.hero-grid{display:grid;grid-template-columns:1fr;gap:18px}
.mid-grid{display:grid;grid-template-columns:1fr;gap:24px}
.doc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.essay-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}
.tile-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.side-stack{display:flex;flex-direction:column;gap:22px}
@media(min-width:900px){
  .hero-grid{grid-template-columns:1.7fr 1fr;gap:22px}
  .mid-grid{grid-template-columns:1.75fr 1fr;gap:32px}
  .tile-grid{grid-template-columns:repeat(auto-fill,minmax(170px,1fr))}
}

/* quote card */
.qcard{position:relative;border-radius:24px;overflow:hidden;background:linear-gradient(158deg,#12b075 0%,#0c8a5b 58%,#087049 100%);box-shadow:0 22px 48px -24px rgba(8,96,61,.6);min-height:340px;display:flex;flex-direction:column}
.qcard .sheen{position:absolute;inset:0;background:radial-gradient(70% 55% at 88% 6%, rgba(255,255,255,.22), transparent 60%),radial-gradient(60% 55% at -6% 100%, rgba(255,255,255,.14), transparent 55%);pointer-events:none}
.qcard .qmark{position:absolute;top:-34px;left:16px;font-family:Georgia,serif;font-size:200px;line-height:1;color:rgba(255,255,255,.13);pointer-events:none}
.qcard .qbody{position:relative;padding:34px 30px 22px;flex:1;display:flex;flex-direction:column;justify-content:center}
.qtopic{display:inline-flex;align-self:flex-start;align-items:center;gap:7px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.28);color:#fff;font-size:11.5px;font-weight:600;padding:5px 11px;border-radius:999px;margin-bottom:22px}
.qtext{margin:0;font-family:var(--serif);font-style:italic;font-weight:600;font-size:clamp(21px,4.8vw,32px);line-height:1.36;color:#fff;text-wrap:pretty;animation:qfade .45s ease}
.qtext a{color:#fff}
@keyframes qfade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.qauthor{display:flex;align-items:center;gap:10px;margin-top:22px}
.qauthor span:first-child{width:26px;height:1.6px;background:rgba(255,255,255,.6)}
.qauthor span:last-child{font-size:14.5px;font-weight:600;color:rgba(255,255,255,.94)}
.qbar{position:relative;display:flex;align-items:center;gap:9px;padding:14px 22px 18px;border-top:1px solid rgba(255,255,255,.16)}
.qbtn{display:flex;align-items:center;gap:7px;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.26);color:#fff;font-size:13px;font-weight:600;padding:9px 14px;border-radius:11px;cursor:pointer}
.qbtn.icon{width:40px;height:40px;padding:0;justify-content:center}

/* doc card */
.doc{display:flex;flex-direction:column}
.doc .cover{height:130px}
.doc .doc-info{padding:15px 16px 17px}
.doc .doc-info h3{margin:0 0 11px;font-size:15.5px;font-weight:700;line-height:1.36;color:var(--ink);text-wrap:pretty}
.meta{display:flex;align-items:center;gap:11px;font-size:12px;font-weight:500;color:var(--muted-2);flex-wrap:wrap}

/* essay row */
.essay{display:flex;gap:13px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:16px;padding:13px 15px;transition:border-color .15s}
.essay:hover{border-color:rgba(18,176,117,.45)}
.grade{flex:none;width:52px;height:52px;border-radius:13px;display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1;overflow:hidden;background-size:cover;background-position:center}
.grade small{font-size:9px;font-weight:700;opacity:.8}
.grade b{font-size:19px;font-weight:800}
.essay .et{flex:1;min-width:0}
.essay .et .tag{font-size:11.5px;font-weight:700;color:var(--green-d);margin-bottom:3px}
.essay .et h3{margin:0 0 5px;font-size:15px;font-weight:600;line-height:1.36;color:var(--ink);text-wrap:pretty}
.essay .et small{font-size:12px;font-weight:500;color:var(--muted-2)}

/* feature essay */
.feature{position:relative;display:block;border-radius:20px;overflow:hidden;min-height:220px;margin-bottom:14px;background:linear-gradient(135deg,#1a5c42,#0c8a5b);background-size:cover;background-position:center}
.feature-scrim{position:absolute;inset:0;background:linear-gradient(to top, rgba(9,54,37,.92) 0%, rgba(9,54,37,.5) 42%, rgba(9,54,37,0) 78%)}
.feature-body{position:absolute;left:0;right:0;bottom:0;padding:22px}
.feature-eyebrow{display:inline-flex;font-size:11px;font-weight:700;letter-spacing:.4px;text-transform:uppercase;color:#8ff0c6;margin-bottom:10px}
.feature-body h3{margin:0 0 8px;font-family:var(--serif);font-weight:700;font-size:clamp(20px,2.6vw,26px);line-height:1.28;color:#fff;text-wrap:pretty}
.feature-meta{display:flex;align-items:center;gap:12px;font-size:12.5px;font-weight:500;color:rgba(255,255,255,.82)}

/* topic tiles */
.tile{display:block;text-align:left;cursor:pointer;border-radius:18px;padding:18px 17px;transition:transform .15s}
.tile:hover{transform:translateY(-2px)}
.tile .tdot{width:34px;height:34px;border-radius:10px;margin-bottom:34px}
.tile .tlabel{font-size:16px;font-weight:700;color:var(--ink)}
.tile .tcount{font-size:12.5px;font-weight:500;color:var(--muted-2);margin-top:3px}

/* hub header (H1 + lead) */
.hub-head{margin:6px 2px 30px;max-width:820px}
.hub-head h1{margin:0 0 12px;font-family:var(--serif);font-weight:700;font-size:clamp(27px,4.4vw,40px);line-height:1.18;color:var(--ink);text-wrap:pretty}
.hub-lead{margin:0;font-size:15.5px;line-height:1.7;color:var(--muted);text-wrap:pretty}
.hub-lead strong{color:var(--ink-2);font-weight:600}
.hub-group{margin:0 2px 12px;font-size:14px;font-weight:700;letter-spacing:.2px;color:#3a4a42}
.tile .tcount{color:var(--green-d);font-weight:600}

/* mini cluster (Học Văn) */
.mini-cluster{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px 22px}
.mini-lead{margin:0 0 14px;font-size:13.5px;line-height:1.6;color:var(--muted);max-width:640px}
.mini-links{display:flex;flex-wrap:wrap;gap:9px}
.mini-links a{font-size:13px;font-weight:600;color:#3a4a42;background:var(--bg);border:1px solid var(--line-2);border-radius:999px;padding:8px 14px}
.mini-links a:hover{border-color:rgba(18,176,117,.45);color:var(--green-d)}

/* FAQ */
.faq{margin-bottom:44px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:2px 18px;margin-bottom:10px}
.faq-item summary{cursor:pointer;list-style:none;padding:15px 24px 15px 0;font-size:15.5px;font-weight:700;color:var(--ink);position:relative}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:2px;top:13px;font-size:20px;font-weight:400;color:var(--green-d)}
.faq-item[open] summary::after{content:"–"}
.faq-a{padding:0 0 16px;font-size:14.5px;line-height:1.7;color:var(--muted)}
.faq-a a{color:var(--green-d);text-decoration:underline}

/* seo */
.seo{padding:28px 24px}
.seo-cols a{color:var(--green-d);text-decoration:underline}
.seo-quote{margin:0 0 20px}
.seo-quote img{width:100%;height:auto;border-radius:16px;border:1px solid var(--line)}
.seo-quote figcaption{margin-top:8px;font-size:12.5px;color:var(--faint);text-align:center}
@media(min-width:760px){.seo-quote{float:right;width:340px;margin:0 0 14px 24px}}
.seo h2{margin:0 0 14px;font-family:var(--serif);font-weight:700;font-size:clamp(20px,2.6vw,26px);line-height:1.3;color:var(--ink);text-wrap:pretty}
.seo-cols{columns:1;column-gap:36px;font-size:14px;line-height:1.75;color:var(--muted);text-wrap:pretty}
.seo-cols p{margin:0 0 12px}
.seo-cols strong{color:var(--ink);font-weight:600}
@media(min-width:640px){.seo-cols{columns:2}}