/* Be Vietnam Pro (SIL OFL 1.1, xem /fonts/OFL.txt), tự lưu trữ, chỉ gồm bộ chữ Latin + Tiếng Việt */
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/be-vietnam-pro-400-vietnamese.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/be-vietnam-pro-400-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:700;font-display:swap;src:url(/fonts/be-vietnam-pro-700-vietnamese.woff2) format("woff2");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Be Vietnam Pro";font-style:normal;font-weight:700;font-display:swap;src:url(/fonts/be-vietnam-pro-700-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
/* Màu: nền trắng, mặt phẳng đá ấm, chữ mực đậm, một màu nhấn cam (nút đạt 5.2:1 với chữ trắng). Cỡ chữ: 5 bậc. */
:root{--bg:#fff;--surf:#f5f2ee;--surf2:#fdf1e7;--ink:#1c2430;--ink2:#3d4655;--acc:#c2410c;--acc-h:#9a3412;--acc-soft:#fdeee3;--acc-ink:#9a3412;--ok:#166534;--ok-bg:#dcfce7;
 --fs-s:15px;--fs-b:18px;--fs-l:22px;--fs-h:30px;--fs-d:clamp(40px,4.8vw,72px);--r:20px;--gap:20px;--font:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
*{box-sizing:border-box}html,body{overflow-x:hidden;overflow-x:clip}
body{margin:0;font:400 var(--fs-b)/1.65 var(--font);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:inherit}img,svg{max-width:100%}h1,h2,h3{font-weight:700;line-height:1.25;letter-spacing:-.01em;margin:.2em 0}
h1{font-size:var(--fs-h)}h2{font-size:var(--fs-l)}h3{font-size:var(--fs-b)}
:focus-visible{outline:3px solid var(--acc);outline-offset:3px;border-radius:6px}
.ic{width:1.15em;height:1.15em;flex:none;vertical-align:-.2em}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
/* Thanh trên */
.topbar{position:sticky;top:0;z-index:20;display:flex;gap:12px;align-items:center;justify-content:space-between;padding:10px 18px;background:var(--bg)}
.brand{font-weight:700;text-decoration:none;font-size:20px;display:flex;align-items:center;gap:10px;white-space:nowrap;min-height:44px}
.logo{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--acc);color:#fff;font-size:14px;font-weight:700}
.side{position:fixed;top:0;right:0;bottom:0;width:300px;background:#fff;padding:18px;transform:translateX(105%);visibility:hidden;transition:transform .25s ease,visibility .25s;z-index:30;overflow:auto;box-shadow:-12px 0 32px #0000001f} /* taste-skill-ignore: bóng cho menu trượt nổi; mặt nạ mờ báo còn chip để vuốt */
.side.open{transform:none;visibility:visible}
.side a{display:flex;align-items:center;gap:12px;min-height:48px;padding:10px 14px;border-radius:14px;text-decoration:none;margin:2px 0;font-weight:700;font-size:17px}
.side a .short{display:none}.side a:hover{background:var(--surf)}.side a.on{background:var(--acc-soft);color:var(--acc-ink)}
.side .price-link{background:var(--acc);color:#fff;margin-top:10px}.side .price-link:hover,.side .price-link.on{background:var(--acc-h);color:#fff}
/* Bố cục */
main{padding:16px 18px 64px;max-width:1200px;margin:auto;min-height:calc(100vh - 68px)}
main.loading .skel{height:70vh;border-radius:28px;background:var(--surf)}
.lead{color:var(--ink2);margin:.3em 0 0;max-width:62ch}.lead.big{font-size:var(--fs-l);line-height:1.5}
.note,.count{color:var(--ink2);font-size:var(--fs-s)}.sec{margin:56px 0 16px;font-size:var(--fs-h)}
/* Nút */
.btn,.copy{display:inline-flex;align-items:center;gap:8px;justify-content:center;min-height:48px;background:var(--acc);color:#fff;border:0;border-radius:999px;padding:12px 24px;font:inherit;font-weight:700;cursor:pointer;text-decoration:none;transition:background .15s,transform .15s}
.btn:hover,.copy:hover{background:var(--acc-h)}.btn:active,.copy:active{transform:scale(.97)}
.btn.big{font-size:var(--fs-b);padding:14px 30px;min-height:56px}
.btn.ghost{background:var(--acc-soft);color:var(--acc-ink)}.btn.ghost:hover{background:#fbdcc6}
.txtlink,.more{display:inline-flex;align-items:center;min-height:48px;font-weight:700;color:var(--acc-ink);text-decoration:none}.txtlink:hover,.more:hover{text-decoration:underline}
/* Hero trang chủ */
.hero{display:grid;gap:24px;align-items:center;margin:8px 0 24px}
.hero h1{font-size:var(--fs-d);line-height:1.08;letter-spacing:-.03em;margin:0}
.cta-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px 22px;margin:22px 0 0}
.stats{list-style:none;padding:0;margin:18px 0 0;display:flex;flex-wrap:wrap;gap:6px 18px;color:var(--ink2);font-size:var(--fs-s)}.stats b{color:var(--ink)}
.hero-art{margin:0;position:relative;border-radius:28px;overflow:hidden;aspect-ratio:3/2;background:var(--surf)}
.hero-art svg,.hero-art img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-art img{animation:drift 18s ease-in-out infinite alternate}
@keyframes drift{from{transform:scale(1.02)}to{transform:scale(1.08) translate(-1.5%,-1%)}}
/* Đầu trang con */
.phero{display:grid;gap:18px;align-items:center;background:var(--surf);border-radius:28px;padding:22px;margin:4px 0 8px}.phero.plain{background:none;padding:8px 0}
.phero h1{font-size:clamp(32px,4.4vw,56px);line-height:1.12;letter-spacing:-.02em;margin:0}
.phero-art{position:relative;border-radius:20px;overflow:hidden;aspect-ratio:16/9;background:#fff}.phero-art svg,.phero-art img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.lockinfo,.updated{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin:14px 0 0;font-size:var(--fs-s);color:var(--ink2)}.lockinfo a{font-weight:700;color:var(--acc-ink)}
/* Công cụ lọc */
.tools{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0}
input,select{font:inherit;min-height:48px;padding:10px 18px;border:2px solid transparent;border-radius:999px;background:var(--surf);color:var(--ink)}input:focus,select:focus{outline:0;border-color:var(--acc);background:#fff}input[type=search]{flex:1 1 100%}
.chips-wrap{position:relative;flex:1 1 100%;min-width:0}
.chips{display:flex;gap:8px;overflow-x:auto;padding:2px 0 6px;scrollbar-width:none;-webkit-mask-image:linear-gradient(90deg,#000 85%,transparent);mask-image:linear-gradient(90deg,#000 85%,transparent)}.chips::-webkit-scrollbar{display:none} /* taste-skill-ignore: bóng cho menu trượt nổi; mặt nạ mờ báo còn chip để vuốt */
.chip{white-space:nowrap;min-height:44px;border:0;background:var(--surf);color:var(--ink);border-radius:999px;padding:8px 18px;font:inherit;font-size:var(--fs-s);font-weight:700;cursor:pointer;transition:background .15s}
.chip:hover{background:#ebe5de}.chip.on{background:var(--ink);color:#fff}
.tag{display:inline-block;align-self:flex-start;background:var(--acc-soft);color:var(--acc-ink);border-radius:999px;padding:3px 12px;font-size:var(--fs-s);font-weight:700}
.tags{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:8px 0}
/* Thẻ */
.grid{display:grid;grid-template-columns:1fr;gap:var(--gap)}
.card{display:flex;flex-direction:column;background:var(--surf);border-radius:var(--r);overflow:hidden;text-decoration:none;transition:transform .2s ease,background .2s}
.card:hover{transform:translateY(-4px);background:#efe9e2}.card:active{transform:scale(.99)}
.cover{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--surf2)}.cover svg,.cover img{position:absolute;inset:0;display:block;width:100%;height:100%;object-fit:cover;transition:transform .5s ease}.card:hover .cover img,.card:hover .cover svg{transform:scale(1.04)}
.cbody{padding:16px 20px 20px;display:flex;flex-direction:column;flex:1}
.card h3{margin:8px 0 6px;font-size:var(--fs-b);line-height:1.4;display:flex;gap:8px;align-items:flex-start}.card h3 .ic{color:var(--acc);margin-top:.15em}.card p{margin:0;color:var(--ink2);font-size:var(--fs-s)}
.meta{display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:var(--fs-s);color:var(--ink2);margin-top:auto;padding-top:14px}.meta.top{margin-top:0;padding-top:0}
.lock{display:inline-flex;align-items:center;gap:4px;background:var(--ink);color:#fff;border-radius:999px;padding:2px 12px;font-size:var(--fs-s);font-weight:700}.lock .ic{width:14px;height:14px}
.free{background:var(--ok-bg);color:var(--ok);border-radius:999px;padding:2px 12px;font-size:var(--fs-s);font-weight:700}
.featured{background:var(--surf2)}
/* Dải mở khóa + giới thiệu */
.band{display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between;background:var(--acc-soft);border-radius:28px;padding:28px;margin:56px 0 0}.band h2{margin:0 0 6px}.band p{margin:0;max-width:60ch;color:var(--ink)}
.about{display:grid;gap:22px;align-items:center;padding:0;margin-top:80px}.about h2{margin-top:0}.about p{max-width:62ch}
.photo-slot{display:grid;place-items:center;aspect-ratio:1;max-width:220px;width:100%;border-radius:50%;background:var(--surf);border:2px dashed #d6c9bc;color:var(--ink2);text-align:center;font-size:var(--fs-s);font-weight:700}
/* Bài chi tiết */
.callout{background:#eaf3ff;border-radius:16px;padding:16px 20px;margin:20px 0}.callout b{display:inline-flex;gap:6px;align-items:center}
.prompt{background:var(--surf);border-radius:var(--r);padding:20px;white-space:pre-wrap;overflow-wrap:anywhere;font-size:17px}.prompt.prompt-vi{background:var(--surf2)}
.prompt-explain{border-left:4px solid var(--surf2);padding:4px 0 4px 16px;white-space:pre-wrap;font-size:16px;line-height:1.6}.prompt-explain b{display:inline-block;margin-top:6px}
.attrib{font-size:15px;color:var(--ink2);border-top:1px solid var(--surf2);padding-top:12px;margin-top:20px}.attrib a{text-decoration:underline}.attrib svg{width:16px;height:16px;vertical-align:-3px;margin-right:4px}
.lockbox{text-align:center;background:var(--surf2);border-radius:var(--r);padding:26px}.lock-t{display:flex;gap:6px;justify-content:center;font-weight:700}
.blur{filter:blur(5px);user-select:none;color:var(--ink2);margin-bottom:14px}.back{display:inline-flex;align-items:center;min-height:44px;color:var(--ink2);text-decoration:none}
.result{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}.result div{background:var(--surf);border-radius:14px;padding:12px 14px}.result b{display:flex;gap:6px;align-items:center;font-size:var(--fs-s)}.result span{display:block}
.glist li{margin:6px 0}
.lesson-body{white-space:pre-wrap;background:var(--surf);border-radius:var(--r);padding:22px;max-width:72ch}
.lesson-nav{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:22px}
.post-cover{position:relative;margin:16px 0 22px;border-radius:24px;overflow:hidden;aspect-ratio:15/7;background:var(--surf)}.post-cover.small{aspect-ratio:3/1;border-radius:20px}.post-cover svg,.post-cover img{position:absolute;inset:0;display:block;width:100%;height:100%;object-fit:cover}
/* Ảnh đầu trang mục: trọn ảnh trên nền mờ của chính ảnh (khung theo tỉ lệ thật, inline aspect-ratio từ api/item.js) */
.post-cover.item-cover{width:100%;margin:12px 0 22px;border-radius:20px;max-height:min(72vh,640px);background:var(--surf);isolation:isolate}
.item-cover::before{content:"";position:absolute;inset:-40px;background:var(--ibg) center/cover no-repeat;filter:blur(30px) saturate(1.15);opacity:.55;transform:scale(1.08);z-index:0}
.post-cover.item-cover img,.post-cover.item-cover svg{object-fit:contain;z-index:1}
.post{max-width:780px;margin:auto}.crumbs{font-size:var(--fs-s);color:var(--ink2)}.crumbs a{display:inline-block;padding:10px 0;text-decoration:none}.crumbs a:hover{text-decoration:underline}
.post-head h1{font-size:clamp(30px,4vw,48px);line-height:1.18;margin:8px 0 10px}.byline{color:var(--ink2);font-size:var(--fs-s);margin:0}.byline a{color:var(--acc-ink)}
.prose{line-height:1.75}.prose h2{margin:40px 0 10px}.prose p,.prose li,.prose blockquote{max-width:min(58ch,100%)}
.dek{font-size:var(--fs-l);line-height:1.55;color:var(--ink);max-width:58ch;margin:4px 0 32px;font-weight:500}
.keybox{background:var(--surf);border-radius:18px;padding:8px 22px;margin:24px 0}.keybox h2{font-size:var(--fs-b);margin:14px 0 4px}.keybox ul{padding-left:20px}
.srcs{list-style:none;padding:0}.src{display:inline-flex;align-items:center;gap:8px;min-height:44px;background:var(--acc-soft);border-radius:999px;padding:8px 18px;color:var(--acc-ink);font-weight:700;text-decoration:none;word-break:break-word}.src:hover{background:#fbdcc6}
.faq details{background:var(--surf);border-radius:14px;padding:4px 20px;margin:10px 0}.faq summary{cursor:pointer;font-weight:700;min-height:44px;display:flex;align-items:center;padding:8px 0}.faq p{margin:0 0 14px;color:var(--ink);word-break:break-word}
.cta{display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between;background:var(--acc-soft);border-radius:24px;padding:22px 24px;margin:36px 0}.cta a:not(.btn){color:var(--acc-ink);font-weight:700}
/* Bảng giá */
.price{display:flex;flex-direction:column;background:var(--surf);border-radius:24px;padding:26px}.price.hot{background:var(--acc-soft);outline:3px solid var(--acc)}
.price h2{margin:0}.price .amt{font-size:var(--fs-h);font-weight:700;margin:6px 0}.price .sub{color:var(--ink2);font-size:var(--fs-s)}.price .btn{margin-top:auto}
.best{margin:0 0 8px;font-weight:700;color:var(--acc-ink);font-size:var(--fs-s)}
.ticks{list-style:none;padding:0;margin:14px 0 22px}.ticks li{display:flex;gap:8px;margin:8px 0}.ticks .ic{color:var(--ok);margin-top:.25em}
/* Chân trang */
.foot{background:var(--surf2);color:var(--ink2);font-size:var(--fs-s);padding:40px 18px}.foot-in{max-width:1200px;margin:auto}.foot-name{font-size:var(--fs-h);font-weight:700;color:var(--ink);margin:0 0 12px}
.foot-links{display:flex;flex-wrap:wrap;gap:4px 22px}.foot-links a{display:inline-flex;align-items:center;min-height:44px;font-weight:700;color:var(--ink)}
#toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 18px;border-radius:999px;opacity:0;transition:.2s;pointer-events:none;z-index:40}#toast.on{opacity:1}
.empty{color:var(--ink2);padding:20px;text-align:center}[hidden]{display:none!important}
/* Chuyển động: nội dung chỉ ẩn khi JS đã gắn .rv */
.rv{opacity:0;transform:translateY(22px);transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.2,1)}.rv.in{opacity:1;transform:none}
/* ---------- v4 nav: thanh tab dưới (điện thoại) + sheet "Thêm". Sheet/scrim nằm ngay dưới <body>. ---------- */
:root{--bar-h:64px;--safe-b:env(safe-area-inset-bottom,0px);--ease-out:cubic-bezier(.22,.61,.36,1);--t-med:280ms}
.skip{position:absolute;left:12px;top:-60px;z-index:80;background:var(--ink);color:#fff;padding:10px 16px;border-radius:12px;font-weight:700;text-decoration:none}.skip:focus{top:10px}
:focus-visible{outline:3px solid var(--acc);outline-offset:2px}
html.lock,html.lock body{overflow:hidden}
body{padding-bottom:calc(var(--bar-h) + var(--safe-b))}
@media(max-width:999.98px){.topbar .side{display:none}}
.tabs{position:fixed;left:0;right:0;bottom:0;z-index:50;background:#fff;box-shadow:0 -1px 0 #1c24301a;padding-bottom:var(--safe-b)} /* taste-skill-ignore: fixed bar overlays content */
.tabs ul{list-style:none;margin:0 auto;padding:0;display:grid;grid-template-columns:repeat(5,1fr);max-width:560px}
.tabs a,.tabs button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;height:var(--bar-h);min-height:64px;width:100%;font:700 13px/1.1 var(--font);color:var(--ink2);text-decoration:none;background:none;border:0;cursor:pointer;position:relative;isolation:isolate;-webkit-tap-highlight-color:transparent}
.tabs .ic{width:22px;height:22px;margin-top:4px}
.tabs [aria-current=page],.tabs .cur,.tabs [aria-expanded=true]{color:var(--acc-ink)}
.tabs [aria-current=page]::before,.tabs .cur::before{content:"";position:absolute;top:6px;left:50%;width:52px;height:30px;margin-left:-26px;border-radius:999px;background:var(--acc-soft);z-index:-1}
.scrim{position:fixed;inset:0;background:#1c243059;z-index:60;opacity:0;pointer-events:none;transition:opacity var(--t-med) var(--ease-out)}
.scrim.on{opacity:1;pointer-events:auto}
.sheet{position:fixed;left:0;right:0;bottom:0;z-index:70;background:#fff;border-radius:24px 24px 0 0;padding:10px 16px calc(20px + var(--safe-b));transform:translateY(105%);transition:transform var(--t-med) var(--ease-out);max-height:85vh;overflow:auto;overscroll-behavior:contain;max-width:640px;margin:0 auto}
.sheet.open{transform:none}.sheet[hidden]{display:none}
.sheet .grab{width:40px;height:5px;border-radius:9px;background:#d6d1ca;margin:4px auto 10px}
.sheet h2{font-size:var(--fs-b);margin:4px 4px 8px}
.sheet a.row{display:flex;align-items:center;gap:14px;min-height:56px;padding:8px 10px;border-radius:14px;text-decoration:none;font-weight:700;color:var(--ink)}
.sheet a.row:hover{background:var(--surf)}.sheet a.row small{display:block;font-weight:400;color:var(--ink2);font-size:var(--fs-s)}
.sheet a.row[aria-current=page]{background:var(--acc-soft);color:var(--acc-ink)}
.sheet .num{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--surf);flex:none}
@media(max-width:999.98px){#toast{bottom:calc(var(--bar-h) + var(--safe-b) + 16px)}}
@media(min-width:1000px){body{padding-bottom:0}.tabs,#more{display:none!important}.sheet{left:50%;right:auto;bottom:auto;top:50%;width:min(560px,92vw);border-radius:24px;transform:translate(-50%,-46%);opacity:0;transition:transform var(--t-med) var(--ease-out),opacity var(--t-med)}.sheet.open{transform:translate(-50%,-50%);opacity:1}.sheet .grab{display:none}}
@media (prefers-reduced-motion:reduce){.sheet,.scrim{transition:none}}
/* ---------- v4: trang danh sách ưu tiên nội dung ---------- */
:root{--top-h:60px;--t-slide:480ms;--ease-io:cubic-bezier(.65,0,.35,1)}
.phead{padding:0}.phead h1{font-size:var(--fs-h);line-height:1.15;letter-spacing:-.015em;margin:0}.phead .sub{color:var(--ink2);font-size:var(--fs-s);margin:4px 0 0;max-width:70ch}
.frow{position:sticky;top:var(--top-h);z-index:15;background:var(--bg);margin:2px -18px 6px;padding:6px 18px}
.frow-in{display:flex;gap:8px;align-items:center}.frow .chips{flex:1;min-width:0;padding:2px 0}
.chip{min-height:40px}
.fbtn{flex:none;display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:8px 14px;border-radius:999px;border:1.5px solid #d6d1ca;background:#fff;font:inherit;font-size:var(--fs-s);font-weight:700;color:var(--ink);cursor:pointer;position:relative}
.fbadge{display:inline-grid;place-items:center;min-width:20px;height:20px;border-radius:999px;background:var(--acc);color:#fff;font-size:12px;padding:0 6px}
.fs-lab{display:block;font-size:16px;font-weight:700;margin:14px 2px 8px}
.sheet input[type=search],.sheet select{width:100%;min-height:48px;font:inherit;font-size:var(--fs-b);padding:10px 14px;border:1.5px solid #d6d1ca;border-radius:14px;background:#fff;color:var(--ink)}
.chips.wrap{flex-wrap:wrap;overflow:visible;-webkit-mask-image:none;mask-image:none}
.sheet-actions{display:flex;gap:10px;position:sticky;bottom:calc(-20px - var(--safe-b));background:#fff;padding:14px 0 6px;margin-top:10px}.sheet-actions .btn{flex:1}
.count{margin:0 0 10px}
/* thẻ tin: lead + compact */
.nlist{display:grid;grid-template-columns:1fr;gap:14px}
.ncard.compact{display:grid;grid-template-columns:112px 1fr;gap:14px;align-items:start;background:none;border-radius:0}
.ncard.compact .cover{aspect-ratio:1;border-radius:14px}
.ncard.compact .cbody{padding:0}.ncard.compact h3{margin:0 0 4px;font-size:17px;line-height:1.35;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.ncard .meta{justify-content:flex-start;flex-wrap:wrap;gap:4px 10px;padding-top:6px}.ncard.compact .meta{padding-top:0}.mtag{color:var(--acc-ink);font-weight:700}
.ncard.lead h3{font-size:var(--fs-l);line-height:1.3;display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
.ncard.compact:hover{transform:none;background:none}.ncard.compact:hover h3{color:var(--acc-ink)}
/* trang chủ */
.hsec{margin:28px 0 8px}.hsec-h{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:12px}.hsec-h h2{margin:0;font-size:var(--fs-l)}.hsec-h .more{font-size:var(--fs-s);font-weight:700;white-space:nowrap}
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:12px}.tiles .card .cbody{padding:12px 14px 14px}.tiles .card h3{font-size:17px;margin:0 0 2px}.tiles .card p{font-size:14px}
.scroller{display:grid;grid-auto-flow:column;grid-auto-columns:78%;gap:14px;overflow-x:auto;scroll-snap-type:x mandatory;margin:0 -18px;padding:2px 18px 10px;scroll-padding:0 18px;scrollbar-width:none}.scroller::-webkit-scrollbar{display:none}.scroller>.card{scroll-snap-align:start}
.intro{background:var(--surf);border-radius:var(--r);padding:20px}.intro-in{display:grid;gap:16px}.intro h2{margin:0 0 6px;font-size:var(--fs-l)}.intro p{margin:0 0 10px}.intro-art{margin:0;border-radius:16px;overflow:hidden;aspect-ratio:16/9;position:relative}.intro-art img,.intro-art svg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
/* trước / sau */
.pn{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:28px 0 8px}.pn-a{display:flex;flex-direction:column;gap:4px;min-height:64px;padding:14px 16px;border-radius:16px;background:var(--surf);text-decoration:none;color:var(--ink)}.pn-a small{color:var(--acc-ink);font-weight:700;font-size:14px}.pn-a span{font-weight:700;font-size:15px;line-height:1.35;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.pn-a.next{text-align:right}.pn-a:hover{background:#efe9e2}
.item-cta{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0 6px}
/* carousel chạy không JS: các hình xếp dọc */
.cz-ssr .cz-fig{margin:0 0 14px}.cz-ssr img{width:100%;height:auto;border-radius:var(--r);aspect-ratio:4/3;object-fit:cover}.cz-ssr figcaption{font-size:var(--fs-s);color:var(--ink2);margin-top:6px}.cz-ssr .cz-fig+.cz-fig{display:none}
@media(min-width:700px){.nlist.big{grid-template-columns:1fr 1fr;gap:24px}.nlist.big .ncard.lead{grid-column:span 2}.tiles{grid-template-columns:repeat(4,1fr)}.intro-in{grid-template-columns:1.3fr 1fr;align-items:center}}
@media(min-width:1000px){:root{--top-h:68px}.frow{margin:6px -28px 10px;padding:8px 28px}.frow .chips{flex-wrap:wrap}.scroller{grid-auto-flow:row;grid-template-columns:repeat(3,1fr);overflow:visible;margin:0;padding:0}
 .nlist.big{grid-template-columns:repeat(3,1fr);gap:28px}.nlist.big .ncard.compact{grid-template-columns:1fr;gap:10px}.nlist.big .ncard.compact .cover{aspect-ratio:16/9;border-radius:var(--r)}.nlist.big .ncard.lead{grid-row:span 2}.nlist.big .ncard.lead h3{font-size:var(--fs-h)}.phead h1{font-size:40px}.cz-stage{aspect-ratio:16/9}}
/* ===== Carousel "Xem nhanh" (guided slides over one ChatGPT cover) ===== */
.cz{--dur:6000ms;position:relative;margin:12px 0 4px}
.cz-stage{position:relative;overflow:hidden;border-radius:var(--r);background:var(--surf);aspect-ratio:4/3;touch-action:pan-y;user-select:none;-webkit-user-select:none}
.cz-track{position:absolute;inset:0}
.cz-slide{position:absolute;inset:0;margin:0;opacity:0;visibility:hidden;transform:translateX(var(--from,6%));transition:opacity var(--t-slide) var(--ease-out),transform var(--t-slide) var(--ease-out),visibility 0s linear var(--t-slide)}
.cz-slide.on{opacity:1;visibility:visible;transform:none;transition-delay:0s;z-index:2}
.cz-slide.out{opacity:0;visibility:visible;transform:translateX(var(--to,-4%));z-index:1}
.cz-slide img{width:100%;height:100%;object-fit:cover;transform-origin:var(--fx,50%) var(--fy,50%);transform:scale(var(--z,1))}
.cz.playing .cz-slide.on img,.cz.kb .cz-slide.on img{animation:czKB calc(var(--dur) + 800ms) var(--ease-io) both}
@keyframes czKB{from{transform:scale(var(--z,1))}to{transform:scale(calc(var(--z,1) * 1.07))}}
/* focus ring: a soft spotlight showing the area the caption talks about */
.cz-spot{position:absolute;inset:0;pointer-events:none;background:radial-gradient(circle at var(--fx,50%) var(--fy,50%),transparent 0 28%,#1c243033 60%); /* taste-skill-ignore: neutral scrim over the photo marks the focus area */opacity:0;transition:opacity var(--t-slide) var(--ease-out)}
.cz-slide.on .cz-spot.show{opacity:1}
/* progress (story bar) */
.cz-prog{position:absolute;top:10px;left:10px;right:10px;z-index:5;display:flex;gap:4px}
.cz-prog span{flex:1;height:4px;border-radius:9px;background:#ffffffcc;overflow:hidden}
.cz-prog i{display:block;height:100%;width:0;background:var(--acc)}
.cz-prog .done i{width:100%}
.cz-prog .on i{width:0}.cz.playing .cz-prog .on i{animation:czFill var(--dur) linear forwards}.cz.paused .cz-prog .on i{animation-play-state:paused}
.cz:not(.playing) .cz-prog .on i{width:100%;animation:none}
@keyframes czFill{to{width:100%}}
.cz-count{position:absolute;right:10px;bottom:10px;z-index:5;background:#1c2430cc;color:#fff;font:700 13px/1 var(--font);padding:7px 10px;border-radius:99px;font-variant-numeric:tabular-nums}
/* edge tap zones (mobile) */
.cz-hit{position:absolute;top:0;bottom:0;width:28%;z-index:4;border:0;background:none;cursor:pointer;padding:0}.cz-hit.prev{left:0}.cz-hit.next{right:0}
/* caption */
.cz-cap{padding:14px 2px 6px;min-height:118px}
.cz-step{font:700 14px var(--font);color:var(--acc-ink);letter-spacing:.02em}
.cz-cap h2{font-size:20px;margin:4px 0 6px;line-height:1.3}
.cz-cap p{color:var(--ink2);font-size:17px;line-height:1.55;max-width:58ch}
.cz-cap>*{transition:opacity 220ms var(--ease-out),transform 220ms var(--ease-out)}
.cz-cap.swap>*{opacity:0;transform:translateY(8px)}
.cz-cap.swap h2{transition-delay:40ms}.cz-cap.swap p{transition-delay:80ms}
/* controls */
.cz-ctl{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.cz-btn{display:inline-grid;place-items:center;width:44px;height:44px;border-radius:50%;border:0;background:var(--surf);color:var(--ink);cursor:pointer}
.cz-btn:hover{background:#ebe6df}.cz-btn[disabled]{opacity:.5;cursor:not-allowed}
.cz-dots{display:flex;gap:2px;margin:0 auto}
.cz-dot{width:28px;height:44px;border:0;background:none;cursor:pointer;display:grid;place-items:center;padding:0}
.cz-dot::after{content:"";width:8px;height:8px;border-radius:9px;background:#7a808a;transition:width var(--t-med) var(--ease-out),background var(--t-med)}
.cz-dot[aria-current=true]::after{width:22px;background:var(--acc)}
.cz-voice{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 14px;border-radius:99px;border:0;background:var(--acc-soft);color:var(--acc-ink);font:700 14px var(--font);cursor:pointer}
.cz-voice[aria-disabled=true]{background:var(--surf);color:var(--ink2);cursor:default}
@media(min-width:1000px){.cz-stage{aspect-ratio:16/9}.cz-cap{min-height:104px}.cz-hit{display:none}}
@media (prefers-reduced-motion:reduce){.cz-slide{transform:none!important}.cz-slide img{animation:none!important}}
/* ===== TTS player ("Nghe bài này") ===== */
.tts{display:flex;align-items:center;gap:12px;background:var(--surf);border-radius:18px;padding:10px 14px 10px 10px;margin:16px 0}
.tts-play{display:grid;place-items:center;width:48px;height:48px;border-radius:50%;border:0;background:var(--acc);color:#fff;cursor:pointer;flex:none}
.tts-play:hover{background:var(--acc-h)}.tts-play .ic{width:22px;height:22px}
.tts-body{flex:1;min-width:0}.tts-title{font-weight:700;font-size:16px}.tts-sub{font-size:14px;color:var(--ink2)}
.tts-bar{height:6px;border-radius:9px;background:#1c24301f;margin-top:6px;overflow:hidden}.tts-bar i{display:block;height:100%;width:var(--p,0%);background:var(--acc);transition:width 250ms linear}
.tts-rate{min-height:44px;min-width:52px;border:0;border-radius:99px;background:#fff;font:700 14px var(--font);color:var(--ink);cursor:pointer}
.tts .spin{animation:spin 900ms linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
.tts[data-state=none] .tts-play,.tts[data-state=error] .tts-play{background:#fff;color:var(--ink2)}
.tts[data-state=none] .tts-rate,.tts[data-state=none] .tts-bar,.tts[data-state=idle] .tts-bar{display:none}
.tts[data-state=error]{background:#fdecec}.tts[data-state=error] .tts-sub{color:#991b1b}

@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}.rv{opacity:1;transform:none}}
@media(min-width:700px){.grid{grid-template-columns:1fr 1fr}input[type=search]{flex:1 1 300px}.chips{flex-wrap:wrap;-webkit-mask-image:none;mask-image:none}.phero{grid-template-columns:1.2fr 1fr;padding:30px}.about{grid-template-columns:220px 1fr;padding:32px}.result{grid-template-columns:repeat(4,1fr)}}
@media(min-width:1000px){main{padding:24px 28px 80px}.grid{grid-template-columns:repeat(3,1fr)}.grid.two{grid-template-columns:1fr 1fr}
 .topbar{padding:10px 28px}.side{position:static;transform:none;visibility:visible;width:auto;padding:0;box-shadow:none;background:none;display:flex;gap:2px;overflow:visible}
 .side a{gap:6px;padding:8px 12px;font-size:15px;margin:0;white-space:nowrap;min-height:44px}.side a .ic{display:none}.side a .full{display:none}.side a .short{display:inline}.side .side-home{display:none}.side .price-link{margin:0 0 0 8px;padding:8px 18px}
 .hero{grid-template-columns:1.1fr 1fr;gap:48px;margin:24px 0 40px}.sec{margin-top:80px}.band{padding:36px 40px}}
input::placeholder{color:var(--ink2);opacity:1}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

.loadmore{text-align:center;margin:28px 0 8px}.loadmore .btn{min-width:220px}
.post-video{display:block;width:100%;max-width:1200px;aspect-ratio:16/9;margin:12px auto;background:#000;border-radius:12px}