:root{
  --bg:#F3F7F5; --surface:#FFFFFF; --ink:#15302A; --muted:#4F635C; --line:#D8E3DE; --line-2:#E6EEEA;
  --brand:#0E6B57; --brand-dark:#0A5343; --soft:#EAF4EF; --accent:#FFD23F;
  --bad:#A5302A; --bad-soft:#FBECEA; --warn-soft:#FDF1E6; --warn:#7A3E0C;
  --radius:16px; --display:'Bricolage Grotesque','Be Vietnam Pro',system-ui,sans-serif; --mono:'IBM Plex Mono',ui-monospace,monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'Be Vietnam Pro',system-ui,sans-serif;font-size:15px;line-height:1.5}
img{max-width:100%;display:block}
a{color:var(--brand)}a:hover{color:var(--brand-dark)}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
h1,h2,h3{margin:0;line-height:1.15;text-wrap:balance}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
/* Cột lưới không được phình theo ảnh lớn (tránh tràn ngang trên điện thoại) */
.hero .wrap,.pd,.layout-2{grid-template-columns:minmax(0,1fr)}
.hero .wrap>*,.pd>*,.layout-2>*,.grid>*,.compat>*{min-width:0}
.mono{font-family:var(--mono)}
.muted{color:var(--muted)}
.hidden{display:none!important}

/* Thanh trên + đầu trang */
.topbar{background:var(--ink);color:var(--bg);font-size:12.5px;font-weight:500;text-align:center;padding:9px 16px}
.site-header{position:sticky;top:0;z-index:20;background:var(--surface);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:60px}
.logo{font-family:var(--display);font-weight:800;font-size:26px;letter-spacing:.02em;color:var(--brand);text-decoration:none}
.nav{display:none;gap:4px}
.nav a{padding:10px 12px;border-radius:10px;color:var(--ink);text-decoration:none;font-weight:500;font-size:14.5px}
.nav a:hover{background:var(--soft)}
.icon-btn{position:relative;width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border:0;background:transparent;color:var(--ink);border-radius:12px;cursor:pointer;text-decoration:none}
.icon-btn:hover{background:var(--soft)}
.cart-count{position:absolute;top:4px;right:2px;min-width:19px;height:19px;padding:0 5px;border-radius:999px;background:var(--brand);color:#fff;font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center}
.cart-count:empty{display:none}
.menu-panel{border-top:1px solid var(--line);background:var(--surface)}
.menu-panel a{display:flex;align-items:center;min-height:48px;padding:0 16px;color:var(--ink);text-decoration:none;font-weight:500;border-bottom:1px solid var(--line-2)}
@media (min-width:860px){.nav{display:flex}.menu-btn{display:none}.menu-panel{display:none!important}}

/* Nút */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:0 20px;border-radius:14px;border:1.5px solid transparent;font:inherit;font-size:16px;font-weight:600;text-decoration:none;cursor:pointer}
.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-dark);color:#fff}
.btn-outline{background:var(--surface);color:var(--ink);border-color:var(--ink)}.btn-outline:hover{background:var(--soft);color:var(--ink)}
.btn-accent{background:var(--accent);color:var(--ink)}.btn-accent:hover{color:var(--ink);filter:brightness(.96)}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn-block{width:100%}

/* Khối chung */
.section{padding:32px 0}
.section-white{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--brand)}
.h1{font-family:var(--display);font-weight:800;font-size:clamp(34px,6vw,54px);line-height:1.05;letter-spacing:-.01em}
.h2{font-family:var(--display);font-weight:700;font-size:clamp(25px,3.6vw,34px)}
.lead{font-size:16px;color:var(--muted);margin:0}
.stack{display:flex;flex-direction:column;gap:14px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}

/* Trang chủ */
.hero{background:var(--surface);padding:28px 0 32px}
.hero .wrap{display:grid;gap:22px}
.hero-img{width:100%;height:auto;aspect-ratio:1/1;object-fit:cover;border-radius:20px}
.hero-cta{display:flex;flex-direction:column;gap:10px}
.price-from{display:flex;align-items:baseline;gap:6px;flex-wrap:wrap}
.price-from b{font-family:var(--mono);font-weight:600;font-size:26px}
@media (min-width:860px){.hero .wrap{grid-template-columns:1.1fr .9fr;align-items:center}.hero-cta{flex-direction:row}}
.trust{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.trust>div{display:flex;flex-direction:column;gap:6px;padding:14px;background:var(--surface)}
.trust b{font-size:14px}.trust span{font-size:12.5px;color:var(--muted);line-height:1.45}
@media (min-width:860px){.trust{grid-template-columns:repeat(4,1fr)}}
.brands{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.brand-tile{display:flex;flex-direction:column;gap:4px;padding:14px 12px;border:1.5px solid var(--line);border-radius:14px;background:var(--surface);color:var(--ink);text-decoration:none;cursor:pointer;font:inherit;text-align:left}
.brand-tile b{font-size:15px}.brand-tile span{font-size:12px;color:var(--muted)}
.brand-tile[aria-pressed=true]{border-color:var(--brand);background:var(--soft)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{min-height:44px;padding:0 16px;border-radius:999px;border:1.5px solid #C5D4CE;background:var(--surface);color:var(--ink);font:inherit;font-size:13.5px;font-weight:500;cursor:pointer}
.chip[aria-pressed=true]{border-color:var(--brand);background:var(--brand);color:#fff;font-weight:600}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
@media (min-width:700px){.grid{grid-template-columns:repeat(3,1fr)}}
@media (min-width:1000px){.grid{grid-template-columns:repeat(4,1fr);gap:16px}}
.p-card{position:relative;display:flex;flex-direction:column;text-decoration:none;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.p-card:hover{border-color:var(--brand);color:var(--ink)}
.p-card img{width:100%;height:auto;aspect-ratio:1/1;object-fit:cover;background:var(--soft)}
.p-card .body{display:flex;flex-direction:column;gap:5px;padding:12px}
.p-card .t{font-size:14px;font-weight:600;line-height:1.3;min-height:36px}
.p-card .c{font-family:var(--mono);font-size:11.5px;color:var(--muted)}
.p-card .pr{display:flex;align-items:baseline;gap:6px;margin-top:4px}
.p-card .pr b{font-size:16px}.p-card .pr span{font-size:11.5px;color:var(--muted)}
.p-card .per{font-family:var(--mono);font-size:11.5px;color:var(--brand)}
.tag-tam{position:absolute;top:8px;left:8px;padding:3px 8px;border-radius:999px;background:var(--bad);color:#fff;font-size:10.5px;font-weight:700;letter-spacing:.02em}
.tag-het{position:absolute;top:8px;right:8px;padding:3px 8px;border-radius:999px;background:var(--ink);color:#fff;font-size:10.5px;font-weight:700}
.soft{display:flex;align-items:center;gap:6px}
.soft .segs{display:flex;gap:3px}.soft .segs i{display:block;width:13px;height:5px;border-radius:3px;background:#DCE5E1}
.soft span{font-size:11.5px;color:var(--muted)}
.empty{padding:28px;text-align:center;color:var(--muted)}
.ok-list,.no-list{display:flex;flex-direction:column;gap:8px;padding:16px;border-radius:var(--radius)}
.ok-list{background:var(--soft)}.no-list{background:var(--bad-soft)}
.ok-list b{color:var(--brand)}.no-list b{color:var(--bad)}
.compat{display:grid;gap:12px}
@media (min-width:860px){.compat{grid-template-columns:repeat(3,1fr)}}
.remind{display:flex;flex-direction:column;gap:10px;padding:18px;border-radius:var(--radius);background:var(--ink);color:var(--bg)}
.remind p{margin:0;color:#C9D8D2;font-size:14px}
.dot-list{display:flex;flex-direction:column;gap:8px}
.dot-list div{display:flex;gap:10px}
.dot-list div::before{content:"";flex-shrink:0;width:8px;height:8px;margin-top:7px;border-radius:50%;background:#FB8C00}
details.faq{border-bottom:1px solid var(--line)}
details.faq summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:56px;font-size:15px;font-weight:600}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";font-size:20px;color:var(--brand)}
details.faq[open] summary::after{content:"–"}
details.faq p{margin:0 0 16px;font-size:14px;color:var(--muted)}

/* Trang sản phẩm */
.crumb{font-size:12.5px;color:var(--muted);padding:12px 0}
.crumb a{color:var(--muted)}
.pd{display:grid;gap:20px;padding-bottom:24px}
@media (min-width:860px){.pd{grid-template-columns:1fr 1fr;align-items:start}}
.gallery .main{width:100%;height:auto;aspect-ratio:1/1;object-fit:contain;border-radius:18px;background:var(--surface)}
.thumbs{display:flex;gap:10px;margin-top:10px;flex-wrap:wrap}
.thumbs button{width:68px;height:68px;padding:0;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--surface);cursor:pointer}
.thumbs button[aria-pressed=true]{border:2px solid var(--brand)}
.thumbs img{width:100%;height:100%;object-fit:cover}
.buy{display:flex;flex-direction:column;gap:14px}
.buy .code{font-family:var(--mono);font-size:13px;font-weight:600;color:var(--brand)}
.buy h1{font-family:var(--display);font-weight:700;font-size:clamp(24px,3vw,30px)}
.price-line{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.price-line .price{font-size:30px;font-weight:700}
.price-line .per{font-family:var(--mono);font-size:14px;color:var(--brand)}
.opt-group{display:flex;flex-direction:column;gap:8px}
.opt-group .label{font-size:13px;font-weight:600;color:var(--muted)}
.opt-btns{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:10px}
.opt-btn{position:relative;min-height:52px;padding:6px 10px;border-radius:14px;border:1.5px solid #C5D4CE;background:var(--surface);color:var(--ink);font:inherit;font-size:14.5px;font-weight:500;cursor:pointer}
.opt-btn[aria-pressed=true]{border:2px solid var(--brand);background:var(--soft);font-weight:700}
.opt-btn[data-het=true]{color:#9AA9A3;text-decoration:line-through}
.stock{font-size:13.5px;color:var(--muted)}
.qty{display:inline-flex;align-items:center;border:1.5px solid #C5D4CE;border-radius:12px;overflow:hidden;background:var(--surface)}
.qty button{width:44px;height:44px;border:0;background:transparent;font-size:20px;cursor:pointer;color:var(--ink)}
.qty input{width:48px;height:44px;border:0;text-align:center;font:inherit;font-size:16px;font-weight:600;-moz-appearance:textfield}
.qty input::-webkit-outer-spin-button,.qty input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.buy-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.perks{display:flex;flex-direction:column;gap:8px;padding:14px;border-radius:14px;background:var(--bg);font-size:13.5px}
.perks div{display:flex;align-items:center;gap:10px}
.scale{display:flex;gap:6px}.scale i{flex:1;height:10px;border-radius:5px;background:#DCE5E1}
.scale-lbl{display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}
.desc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:4px 18px 18px}
.desc h3{font-size:16px;font-weight:700;margin:18px 0 8px}
.desc ul{margin:0;padding-left:20px}.desc li{margin:4px 0}
.desc p{margin:8px 0}
.desc em{color:var(--muted);font-size:13px}
.warn-tam{padding:12px 14px;border-radius:12px;background:var(--bad-soft);color:#7E2621;font-size:13.5px}
.toast{position:fixed;left:50%;bottom:20px;transform:translateX(-50%);z-index:50;max-width:calc(100% - 32px);padding:12px 18px;border-radius:12px;background:var(--ink);color:#fff;font-size:14px;box-shadow:0 8px 24px rgba(0,0,0,.18)}
.sticky-buy{position:sticky;bottom:0;z-index:15;background:var(--surface);border-top:1px solid var(--line);padding:10px 16px}
@media (min-width:860px){.sticky-buy{display:none}}

/* Giỏ hàng, thanh toán */
.cart-line{display:grid;grid-template-columns:72px 1fr;gap:12px;padding:14px 0;border-bottom:1px solid var(--line-2)}
.cart-line img{width:72px;height:72px;object-fit:cover;border-radius:12px;background:var(--soft)}
.cart-line .n{font-weight:600;font-size:14.5px;line-height:1.35;color:var(--ink);text-decoration:none}
.cart-line .o{font-size:13px;color:var(--muted)}
.cart-line .row{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:8px;flex-wrap:wrap}
.link-btn{border:0;background:none;color:var(--bad);font:inherit;font-size:13px;cursor:pointer;padding:8px 0}
.sum{display:flex;flex-direction:column;gap:8px;padding:16px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line)}
.sum .r{display:flex;justify-content:space-between;gap:10px;font-size:14.5px}
.sum .total{font-size:18px;font-weight:700;border-top:1px solid var(--line);padding-top:10px}
.nudge{padding:10px 12px;border-radius:10px;background:#FFF6D6;font-size:13.5px;color:#5C4700}
.nudge-ok{background:var(--soft);color:var(--brand-dark)}
.tiers{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.tier{display:flex;flex-direction:column;gap:2px;padding:14px;border:1.5px solid var(--line);border-radius:14px;background:var(--surface)}
.tier span{font-size:12.5px;color:var(--muted)}.tier b{font-size:18px}.tier em{font-style:normal;font-weight:700;color:var(--brand)}
.layout-2{display:grid;gap:20px}
@media (min-width:860px){.layout-2{grid-template-columns:1.4fr 1fr;align-items:start}}
.form{display:flex;flex-direction:column;gap:16px;padding:20px 16px;background:var(--surface);border:1px solid var(--line);border-radius:18px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:13.5px;font-weight:600}
.field .hint{font-size:12.5px;color:var(--muted)}
.input,.select,.textarea{min-height:48px;width:100%;padding:0 14px;border:1.5px solid #C5D4CE;border-radius:12px;font:inherit;font-size:15px;color:var(--ink);background:var(--surface)}
.textarea{padding:12px 14px;min-height:84px;resize:vertical}
.input[aria-invalid=true],.select[aria-invalid=true]{border-color:var(--bad)}
.err{font-size:12.5px;color:var(--bad)}
.pay-opt{display:flex;gap:12px;align-items:flex-start;padding:14px;border:1.5px solid #C5D4CE;border-radius:14px;cursor:pointer}
.pay-opt:has(input:checked){border:2px solid var(--brand);background:var(--soft)}
.pay-opt input{width:20px;height:20px;margin:2px 0 0;accent-color:var(--brand)}
.pay-opt b{display:block;font-size:14.5px}.pay-opt span{font-size:13px;color:var(--muted)}
.check{display:flex;gap:12px;align-items:flex-start;font-size:13.5px;color:#3D524B}
.check input{flex-shrink:0;width:22px;height:22px;margin:1px 0 0;accent-color:var(--brand)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.notice{padding:14px;border-radius:14px;font-size:14px}
.notice-ok{background:var(--soft);color:var(--brand-dark)}
.notice-bad{background:var(--bad-soft);color:#7E2621}
.qr-box{display:flex;flex-direction:column;align-items:center;gap:10px;padding:18px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);text-align:center}
.qr-box img{width:240px;height:240px;object-fit:contain}
.qr-ph{width:240px;height:240px;display:flex;align-items:center;justify-content:center;border:1.5px dashed #B7C8C1;border-radius:12px;color:var(--muted);font-size:13px;padding:16px}
.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;font-size:14.5px;text-align:left}
.kv dt{color:var(--muted)}.kv dd{margin:0;font-weight:600;word-break:break-word}

/* Trang văn bản */
.doc{max-width:760px}
.doc h1{font-family:var(--display);font-weight:800;font-size:clamp(28px,4vw,38px);margin:8px 0 16px}
.doc h2{font-size:18px;font-weight:700;margin:24px 0 8px}
.doc p,.doc li{font-size:15px}
.doc ul{padding-left:20px}

/* Chân trang */
.site-footer{background:var(--ink);color:#C9D8D2;font-size:13.5px;line-height:1.55;padding:32px 0}
.site-footer .wrap{display:grid;gap:22px}
@media (min-width:860px){.site-footer .wrap{grid-template-columns:1.3fr 1fr 1fr}}
.site-footer .logo{color:#fff;font-size:28px}
.site-footer b{color:#fff}
.site-footer nav{display:flex;flex-direction:column}
.site-footer nav a{color:#fff;text-decoration:none;min-height:34px;display:flex;align-items:center}
.site-footer .small{font-size:12px;color:#9FB6AE}
.moit-ph{padding:14px;border:1.5px dashed #5E7A71;border-radius:12px;font-size:12.5px;color:#9FB6AE}