:root{--bg:#fafafa;--card:#fff;--text:#1d2330;--muted:#6b7280;--line:#e5e7eb;--accent:#0d9488;--buy:#f97316;--good:#15803d;--bad:#b91c1c;--warn:#b45309}
@media(prefers-color-scheme:dark){:root{--bg:#12151b;--card:#1a1f29;--text:#e6e9ef;--muted:#9aa3b2;--line:#2b3240;--accent:#2dd4bf;--buy:#fb923c;--good:#4ade80;--bad:#f87171;--warn:#fbbf24}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--accent)}img{max-width:100%;height:auto}
.wrap{max-width:1180px;margin:0 auto;padding:0 16px}
.site-header{background:var(--card);border-bottom:1px solid var(--line)}
.site-header .bar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:12px;padding-bottom:12px}
.brand{font-size:22px;font-weight:800;color:var(--text);text-decoration:none}
.search input{width:240px;max-width:100%;padding:7px 12px;font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:99px}
.cats{display:flex;gap:4px;overflow-x:auto;flex:1;margin:0 8px}
.cats a{white-space:nowrap;padding:4px 12px;border-radius:99px;text-decoration:none;color:var(--muted);font-size:14px}
.cats a.on,.cats a:hover{background:var(--accent);color:#fff}
main{padding-top:24px;padding-bottom:40px;min-height:60vh}
.page-title{font-size:26px;margin:0 0 18px}
.muted{color:var(--muted);font-size:14px}
.empty{text-align:center;color:var(--muted);padding:60px 0}
.grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px}
.grid .card h2{font-size:15px}.grid .card p{font-size:13px}.grid .card-body{padding:12px}
@media(max-width:1100px){.grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(max-width:900px){.grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:640px){.grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}}
@media(max-width:380px){.grid{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;overflow:hidden;display:flex;flex-direction:column}
.thumb{display:block;aspect-ratio:16/10;background:var(--line)}
.thumb img{width:100%;height:100%;object-fit:cover;display:block}
.noimg{display:block;width:100%;height:100%}
.card-body{padding:14px;display:flex;flex-direction:column;gap:6px;flex:1}
.card h2{font-size:17px;line-height:1.35;margin:0}.card h2 a{color:var(--text);text-decoration:none}.card h2 a:hover{color:var(--accent)}
.card p{margin:0;color:var(--muted);font-size:14px}
.cat{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.03em;text-decoration:none}
.meta{display:flex;align-items:center;gap:12px;margin-top:auto;color:var(--muted);font-size:13px}
.score{display:inline-block;padding:1px 9px;border-radius:6px;background:var(--accent);color:#fff;font-weight:700}.score small{opacity:.8;font-weight:400}
.pager{display:flex;gap:6px;justify-content:center;margin-top:28px;flex-wrap:wrap}
.pager a,.pager span{padding:6px 12px;border:1px solid var(--line);border-radius:6px;background:var(--card);text-decoration:none}
.pager .on{background:var(--accent);border-color:var(--accent);color:#fff}
.post h1{font-size:30px;line-height:1.25;margin:6px 0 10px}
.crumbs{font-size:14px;color:var(--muted)}.crumbs a{text-decoration:none}
.hero{margin:18px 0}.hero img{width:100%;border-radius:10px}
.lead{font-size:18px;color:var(--muted)}
.proscons{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0}
@media(max-width:640px){.proscons{grid-template-columns:1fr}.search{display:none}}
.proscons section{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:4px 16px 8px}
.proscons h2{font-size:16px}.pros h2{color:var(--good)}.cons h2{color:var(--bad)}
.proscons ul{margin:0;padding-left:20px}
.content h2{font-size:22px;margin:30px 0 8px}.content h3{font-size:18px}
.content img{border-radius:8px}.content figure{margin:18px 0}.content figcaption{font-size:12px;color:var(--muted);margin-top:4px;text-align:center}
.content table{border-collapse:collapse;width:100%;display:block;overflow-x:auto}.content th,.content td{border:1px solid var(--line);padding:6px 10px}
.advice{margin:32px 0;padding:18px 20px;border:2px solid var(--accent);border-radius:12px;background:var(--card)}
.advice h2{margin:0 0 6px;font-size:20px}.advice p{white-space:pre-line}
.cta{display:inline-block;margin:6px 0;padding:11px 20px;border-radius:8px;background:var(--buy);color:#fff;font-weight:700;text-decoration:none}
.related{margin-top:40px}.related h2{font-size:20px}
.preview{background:var(--warn);color:#fff;padding:8px 14px;border-radius:8px;margin-bottom:16px;font-weight:600}
.site-footer{border-top:1px solid var(--line);background:var(--card);color:var(--muted);font-size:13px;padding:20px 0}

/* ===== Trang bài viết kiểu TechGear ===== */
.layout{display:grid;grid-template-columns:minmax(0,1fr);gap:28px;margin-top:8px}
.layout.has-side{grid-template-columns:minmax(0,1fr) 300px}
@media(max-width:900px){.layout.has-side{grid-template-columns:minmax(0,1fr)}}
.post h1{font-size:32px;line-height:1.2;margin:8px 0 6px}
.byline{color:var(--muted);font-size:14px;margin-bottom:18px}
.stars{display:inline-block;font-style:normal;letter-spacing:2px;background:linear-gradient(90deg,#f59e0b var(--p),var(--line) var(--p));-webkit-background-clip:text;background-clip:text;color:transparent}
.product{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(280px,1fr);gap:0;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.05)}
@media(max-width:700px){.product{grid-template-columns:1fr}}
.gallery{display:grid;grid-template-columns:64px minmax(0,1fr);gap:12px;padding:16px;align-items:start}
.thumbs{display:flex;flex-direction:column;gap:8px;width:64px}
.thumbs button{padding:0;border:2px solid var(--line);border-radius:8px;overflow:hidden;background:var(--bg);cursor:pointer;aspect-ratio:1}
.thumbs button.on{border-color:var(--accent)}.thumbs img{width:100%;height:100%;object-fit:cover;display:block}
.stage{position:relative;aspect-ratio:4/3;min-width:0;display:flex;align-items:center;justify-content:center;background:var(--bg);border-radius:10px;overflow:hidden}
.ai-note{position:absolute;left:8px;bottom:8px;padding:2px 8px;border-radius:99px;background:rgba(0,0,0,.55);color:#fff;font-size:12px}
.stage img{width:100%;height:100%;object-fit:contain}
.buybox{padding:24px 28px;display:flex;flex-direction:column;gap:14px;justify-content:center;border-left:1px solid var(--line)}
@media(max-width:700px){.buybox{border-left:0;border-top:1px solid var(--line);padding:18px}.gallery{display:flex;flex-direction:column-reverse;padding:12px}.thumbs{flex-direction:row;width:auto}.thumbs button{width:60px}}
.buybox h2{font-size:20px;margin:0;line-height:1.35}.rate{font-size:15px}.rate b{font-size:20px;margin-left:4px}
.buybox .cta{text-align:center;margin:4px 0 0;white-space:nowrap}
.sec{font-size:24px;margin:30px 0 12px}
.glance{display:grid;grid-template-columns:1fr;gap:16px}
@media(max-width:640px){.glance{grid-template-columns:1fr}}
.glance section{background:var(--card);border:1px solid var(--line);border-radius:10px;overflow:hidden;box-shadow:0 2px 6px rgba(0,0,0,.04)}
.glance h3{margin:0;padding:10px 16px;color:#fff;font-size:17px}
.glance .good h3{background:#16a34a}.glance .bad h3{background:#dc2626}
.glance ul{list-style:none;margin:0;padding:12px 16px}.glance li{position:relative;padding:4px 0 4px 26px}
.glance li:before{position:absolute;left:0;font-weight:700}
.glance .good li:before{content:"✔";color:#16a34a}.glance .bad li:before{content:"✖";color:#dc2626}
.side .box{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;position:sticky;top:16px}
.side h2{font-size:17px;margin:0 0 10px}
.mini{display:flex;gap:10px;align-items:center;padding:8px 0;border-top:1px solid var(--line);text-decoration:none;color:var(--text)}
.mini:first-of-type{border-top:0}.mini img,.mini .noimg{width:64px;height:64px;border-radius:8px;object-fit:cover;flex:none;background:var(--line)}
.mini b{display:block;font-size:14px;line-height:1.3}.mini em{font-style:normal;font-size:12px;color:var(--muted)}

/* ===== Tinh chỉnh cho sát mẫu TechGear ===== */
@media(prefers-color-scheme:light){:root{--bg:#fff}}
.brand{display:flex;align-items:center;gap:8px;font-size:20px;letter-spacing:-.01em}
.logo{width:28px;height:28px;color:var(--accent);flex:none}
.cats a{border-radius:0;padding:6px 12px;color:var(--text);font-weight:600;font-size:14px}
.cats a.on,.cats a:hover{background:none;color:var(--accent)}
.search input{width:210px;padding-left:34px;background:var(--bg) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2.2' stroke-linecap='round'><circle cx='11' cy='11' r='7'/><path d='m20 20-3.5-3.5'/></svg>") no-repeat 12px center}
.post h1{font-size:36px;font-weight:800;letter-spacing:-.02em;line-height:1.15}
.buybox .cta{display:block;width:100%}.buybox small{text-align:center}
/* Ảnh trong bài: nằm giữa, rộng vừa phải */
.content figure{float:none;clear:both;margin:20px auto;text-align:center;max-width:100%}
.content figure img,.content>img,.content p>img{display:block;margin:0 auto;max-width:100%;height:auto}
.content>img,.content p>img{margin:18px auto}
@media(min-width:700px){.content figure{max-width:70%}.content figure img{width:100%}.content>img,.content p>img{max-width:70%}}

.stage{position:relative}.ai-note{position:absolute;right:6px;bottom:6px;background:rgba(0,0,0,.55);color:#fff;font-size:11px;padding:2px 6px;border-radius:4px}

.logo-img{display:block;height:36px;width:auto;max-width:200px;object-fit:contain}
.site-footer a{color:var(--accent)}
.zalo-fab{position:fixed;right:16px;bottom:16px;z-index:50;display:flex;align-items:center;gap:8px;padding:11px 16px;border-radius:99px;background:#0068ff;color:#fff;font-weight:700;font-size:14px;line-height:1;text-decoration:none;box-shadow:0 4px 14px rgba(0,104,255,.4)}
.zalo-fab:hover{filter:brightness(1.1)}
.call-fab{position:fixed;right:16px;bottom:68px;z-index:50;display:flex;align-items:center;gap:8px;padding:11px 16px;border-radius:99px;background:#16a34a;color:#fff;font-weight:700;font-size:14px;line-height:1;text-decoration:none;box-shadow:0 4px 14px rgba(22,163,74,.4)}
.call-fab:hover{filter:brightness(1.1)}
@media(max-width:700px){.logo-img{height:30px;max-width:150px}.zalo-fab{right:12px;bottom:12px}.call-fab{right:12px;bottom:64px}}

/* ===== Chuyên mục con: dropdown trên menu + chip trên trang chuyên mục ===== */
.cats .dd{position:relative;display:flex;align-items:center}
.cats .dd .caret{font-size:11px;opacity:.7}
.cats .dd-menu{display:none;position:absolute;left:0;top:100%;z-index:40;min-width:190px;padding:6px 0;background:var(--card);border:1px solid var(--line);border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,.12)}
.cats .dd-menu a{display:block;white-space:nowrap;padding:7px 16px;font-weight:500}
.cats .dd:hover .dd-menu,.cats .dd:focus-within .dd-menu{display:block}
@media(min-width:901px){.cats{overflow:visible;flex-wrap:nowrap}.cats a{white-space:nowrap}.menu-panel{gap:10px}.search input{width:150px}}
@media(min-width:901px) and (max-width:1180px){.cats a{padding:6px 7px;font-size:13px}.cats{margin:0 2px}.search input{width:120px}}
/* Desktop: gói menu + ô tìm kiếm thành một khối ngang; nút ☰ và nút ▾ mở chuyên mục con chỉ dùng trên điện thoại */
.menu-panel{display:flex;align-items:center;flex:1;gap:16px;min-width:0}
.nav-toggle,.cats .dd-btn{display:none}
@media(max-width:900px){
  /* Điện thoại/máy tính bảng: menu GOM LẠI sau nút ☰, bấm mới xổ ra danh sách dọc */
  .site-header .bar{flex-wrap:wrap;gap:8px 12px}
  .nav-toggle{display:flex;flex-direction:column;justify-content:center;gap:5px;width:42px;height:42px;margin-left:auto;padding:0 10px;background:none;border:1px solid var(--line);border-radius:8px;cursor:pointer}
  .nav-toggle span{display:block;height:2px;border-radius:2px;background:var(--text);transition:transform .2s,opacity .2s}
  .site-header.open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .site-header.open .nav-toggle span:nth-child(2){opacity:0}
  .site-header.open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .menu-panel{display:none;flex:0 0 100%;flex-direction:column;align-items:stretch;gap:12px;padding:4px 0 8px}
  .site-header.open .menu-panel{display:flex}
  .cats{flex-direction:column;flex:none;gap:0;margin:0;overflow:visible}
  .cats>a,.cats .dd>a{display:block;padding:12px 4px;border-radius:0;border-bottom:1px solid var(--line);font-size:16px;color:var(--text)}
  .cats a.on,.cats a:hover{background:none;color:var(--accent)}
  .cats .dd{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:stretch}
  .cats .dd .caret{display:none}
  .cats .dd-btn{display:flex;align-items:center;justify-content:center;width:44px;background:none;border:0;border-bottom:1px solid var(--line);color:var(--muted);font-size:14px;cursor:pointer}
  .cats .dd-btn span{transition:transform .2s}
  .cats .dd.open .dd-btn span{transform:rotate(180deg)}
  .cats .dd .dd-menu,.cats .dd:hover .dd-menu,.cats .dd:focus-within .dd-menu{display:none;grid-column:1/-1;position:static;min-width:0;padding:0 0 0 16px;border:0;box-shadow:none;background:none}
  .cats .dd.open .dd-menu{display:block}
  .cats .dd-menu a{display:block;padding:10px 4px;font-size:15px;font-weight:400;color:var(--muted);border-bottom:1px solid var(--line)}
  .menu-panel .search{display:block}
  .menu-panel .search input{width:100%;padding-top:10px;padding-bottom:10px}
}
.subcats{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px}
.subcats a{padding:5px 14px;border:1px solid var(--line);border-radius:99px;background:var(--card);text-decoration:none;color:var(--text);font-size:14px}
.subcats a:hover{border-color:var(--accent);color:var(--accent)}
.subcats small{color:var(--muted);margin-left:4px}

/* ===== Video đại diện ===== */
.thumb video,.mini video{width:100%;height:100%;object-fit:cover;display:block}
.mini video{width:64px;height:64px;border-radius:8px;flex:none;background:var(--line)}
.thumbs button video{width:100%;height:100%;object-fit:cover;display:block;pointer-events:none}
.thumbs button.vid{position:relative}
.thumbs button.vid::after{content:"▶";position:absolute;inset:auto 4px 4px auto;width:20px;height:20px;border-radius:50%;background:rgba(0,0,0,.6);color:#fff;font-size:10px;line-height:20px;text-align:center}
.stage video{width:100%;height:100%;object-fit:contain;background:#000}

/* ---- Giao diện & nội dung do admin chỉnh ---- */
.hero{position:relative;border-radius:12px;overflow:hidden;padding:44px 24px;margin:18px 0;background:var(--card);border:1px solid var(--line)}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero.has-img::before{content:"";position:absolute;inset:0;background:rgba(0,0,0,.45)}
.hero-body{position:relative;max-width:720px}
.hero h1{margin:0 0 8px;font-size:30px;line-height:1.25}.hero p{margin:0 0 14px;color:var(--muted);font-size:17px}
.hero.has-img h1,.hero.has-img p{color:#fff}
.hero-btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;font-weight:600;padding:10px 18px;border-radius:8px}
.home-intro{margin:6px 0 18px}
.static-page{max-width:820px;margin:18px auto}
.cats.extra{margin-top:0}
.foot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:24px;margin-bottom:16px}
.foot-grid h3{font-size:14px;margin:0 0 8px;color:var(--text)}
.foot-grid ul{list-style:none;margin:0;padding:0}.foot-grid li{margin:4px 0}
.foot-text{white-space:pre-line;margin:0 0 8px}
.foot-social a,.foot-links a{margin-right:14px}

/* ===== Cụm bài theo chuyên mục ở trang chủ + khoảng cách dưới menu ===== */
main{padding-top:36px}
.site-header{margin-bottom:8px}
.cluster{margin:0 0 40px}
.cluster-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:0 0 14px;padding-bottom:8px;border-bottom:2px solid var(--accent)}
.cluster-head h2{margin:0;font-size:22px;line-height:1.3}
.cluster-head h2 a{color:var(--text);text-decoration:none}.cluster-head h2 a:hover{color:var(--accent)}
.cluster-head .more{font-size:14px;font-weight:600;text-decoration:none;white-space:nowrap}
@media(max-width:640px){main{padding-top:24px}.cluster{margin-bottom:28px}.cluster-head h2{font-size:19px}}