:root{
  --brand:#e8571c;--brand-dark:#c4430f;--brand-soft:#fdeee6;
  --ink:#1b1a18;--ink-2:#4a4743;--ink-3:#7a766f;
  --bg:#faf8f5;--card:#ffffff;--line:#ebe6df;
  --zalo:#0068ff;
  --radius:16px;--shadow:0 1px 2px rgba(27,26,24,.05),0 8px 24px rgba(27,26,24,.06);
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand-dark)}
h1,h2,h3{line-height:1.25;letter-spacing:-.01em;margin:0 0 .5em}
h1{font-size:clamp(1.75rem,4vw,2.75rem);font-weight:800}
h2{font-size:clamp(1.4rem,2.6vw,1.9rem);font-weight:800}
h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 1em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px}.skip:focus{left:16px;top:8px;background:#fff;padding:8px 12px;z-index:99}

/* Header */
.hdr{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.hdr .wrap{display:flex;align-items:center;gap:16px;height:64px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;letter-spacing:.02em}
.logo-mark{width:36px;height:36px;border-radius:10px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:15px}
.logo small{display:block;font-weight:500;color:var(--ink-3);font-size:11px;letter-spacing:.04em;margin-top:-3px}
.nav{display:flex;gap:22px;margin-left:auto}
.nav a{color:var(--ink-2);text-decoration:none;font-size:14px;font-weight:600}
.nav a:hover{color:var(--brand)}
.hdr .btn{margin-left:8px}
@media (max-width:900px){.nav{display:none}.hdr .btn{margin-left:auto}}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border-radius:999px;font-weight:700;text-decoration:none;font-size:15px;border:2px solid transparent;transition:transform .15s,background .15s;white-space:nowrap}
.btn:hover{transform:translateY(-1px)}
.btn svg{width:20px;height:20px;flex:none}
.btn-zalo{background:var(--zalo);color:#fff}
.btn-zalo:hover{background:#0056d6}
.btn-brand{background:var(--brand);color:#fff}
.btn-brand:hover{background:var(--brand-dark)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-sm{padding:9px 16px;font-size:14px}
.btn-row{display:flex;flex-wrap:wrap;gap:12px}

/* Breadcrumb */
.crumb{font-size:13px;color:var(--ink-3);padding:14px 0 0}
.crumb ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}
.crumb li+li::before{content:"›";margin-right:6px;color:#bbb}
.crumb a{color:var(--ink-3);text-decoration:none}
.crumb a:hover{color:var(--brand)}

/* Hero */
.hero{padding:24px 0 40px}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--brand-dark);background:var(--brand-soft);padding:6px 12px;border-radius:999px;margin-bottom:16px}
.lead{font-size:1.1rem;color:var(--ink-2);max-width:56ch}
.chip{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 14px;margin:20px 0;max-width:420px}
.sw{width:56px;height:40px;border-radius:10px;border:1px solid rgba(0,0,0,.08);flex:none;box-shadow:inset 0 1px 2px rgba(0,0,0,.08)}
.chip b{display:block;font-size:15px}
.chip span{font-size:13px;color:var(--ink-3)}
.ticks{list-style:none;padding:0;margin:0 0 24px;display:grid;gap:8px}
.ticks li{display:flex;gap:10px;align-items:flex-start;color:var(--ink-2)}
.ticks li::before{content:"";width:20px;height:20px;flex:none;margin-top:3px;border-radius:50%;background:var(--brand) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'%3E%3Cpath d='M5 12l5 5L20 7'/%3E%3C/svg%3E") center/12px no-repeat}
.hero-img{border-radius:22px;overflow:hidden;box-shadow:var(--shadow);background:#fff}
.hero-note{font-size:13px;color:var(--ink-3);margin-top:12px}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr;gap:24px}.hero-img{order:-1}}

/* Trust strip */
.trust{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.trust ul{list-style:none;margin:0 auto;padding:18px 16px;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;max-width:var(--max)}
.trust li{display:flex;align-items:center;gap:10px;font-weight:700;font-size:14px}
.trust svg{width:28px;height:28px;color:var(--brand);flex:none}
@media (max-width:700px){.trust ul{grid-template-columns:repeat(2,1fr)}}

/* Sections */
.sec{padding:56px 0}
.sec-alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:760px;margin-bottom:28px}
.sec-head p{color:var(--ink-2)}
.kicker{font-size:13px;font-weight:800;color:var(--brand);text-transform:uppercase;letter-spacing:.08em;margin-bottom:8px;display:block}

/* Gallery */
.gal{display:grid;grid-template-columns:2fr 1fr 1fr;grid-template-rows:auto auto;gap:12px}
.gal a{display:block;border-radius:14px;overflow:hidden;background:#eee;position:relative}
.gal a:first-child{grid-row:span 2}
.gal img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.gal a:hover img{transform:scale(1.03)}
@media (max-width:700px){.gal{grid-template-columns:1fr 1fr}.gal a:first-child{grid-column:span 2;grid-row:auto}}
.lb{border:0;padding:0;background:transparent;max-width:min(1400px,96vw);width:100%}
.lb::backdrop{background:rgba(10,10,10,.88)}
.lb img{width:100%;border-radius:10px}
.lb-close,.lb-nav{position:fixed;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.14);color:#fff;border:0;width:48px;height:48px;border-radius:50%;font-size:26px;cursor:pointer}
.lb-close{top:20px;right:20px;transform:none}
.lb-prev{left:16px}.lb-next{right:16px}

/* Article */
.article{display:grid;grid-template-columns:260px 1fr;gap:48px;align-items:start}
.toc{position:sticky;top:84px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;font-size:14px}
.toc b{display:block;margin-bottom:10px}
.toc ol{margin:0;padding-left:18px;display:grid;gap:6px}
.toc a{color:var(--ink-2);text-decoration:none}
.toc a:hover{color:var(--brand)}
.prose{max-width:780px}
.prose > section{scroll-margin-top:84px;margin-bottom:48px}
.prose p,.prose li{color:var(--ink-2)}
.prose h3{margin-top:1.4em}
.fit{font-size:14px;background:var(--brand-soft);color:var(--brand-dark);padding:8px 12px;border-radius:10px;display:inline-block}
@media (max-width:960px){.article{grid-template-columns:1fr}.toc{position:static}}

.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card svg{width:34px;height:34px;color:var(--brand);margin-bottom:10px}
.card h3{font-size:1.02rem;margin-bottom:.35em}
.card p{font-size:14.5px;margin:0;color:var(--ink-2)}
@media (max-width:900px){.cards{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.cards{grid-template-columns:1fr}}

.pc{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.pc > div{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.pc h3{margin-top:0}
.pc ul{margin:0;padding-left:20px}
.pc li{margin-bottom:10px}
.pc .con{border-color:#f3d9c9;background:#fffaf6}
@media (max-width:700px){.pc{grid-template-columns:1fr}}

.steps{list-style:none;counter-reset:s;padding:0;margin:0;display:grid;gap:14px}
.steps li{counter-increment:s;display:grid;grid-template-columns:44px 1fr;gap:14px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 18px}
.steps li::before{content:counter(s);width:40px;height:40px;border-radius:12px;background:var(--brand);color:#fff;font-weight:800;display:grid;place-items:center}
.steps h3{font-size:1rem;margin:0 0 4px}
.steps p{margin:0;font-size:15px}

.spec{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;font-size:15px}
.spec th,.spec td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}
.spec th{width:34%;background:#fcfaf7;font-weight:700;color:var(--ink)}
.spec tr:last-child th,.spec tr:last-child td{border-bottom:0}
@media (max-width:560px){.spec th,.spec td{display:block;width:100%}.spec th{border-bottom:0;padding-bottom:2px}}

.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:10px}
.faq summary{cursor:pointer;padding:16px 48px 16px 18px;font-weight:700;list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:18px;top:12px;font-size:24px;color:var(--brand);font-weight:400}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 18px 16px;margin:0}

/* CTA band */
.cta{background:var(--ink);color:#fff;border-radius:24px;padding:40px;display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center}
.cta h2{color:#fff;margin-bottom:.3em}
.cta p{color:#cfcac3;margin:0}
.cta .btn-ghost{background:transparent;color:#fff;border-color:#4a4743}
@media (max-width:760px){.cta{grid-template-columns:1fr;padding:28px}}

/* Color grid */
.colors{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:14px}
.color{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px;text-decoration:none;color:var(--ink);transition:border-color .15s,transform .15s}
.color:hover{border-color:var(--brand);transform:translateY(-2px)}
.color .sw{width:100%;height:54px;margin-bottom:10px}
.color b{display:block;font-size:14px}
.color span{font-size:12.5px;color:var(--ink-3)}
.color[aria-current]{border-color:var(--brand);box-shadow:0 0 0 2px var(--brand-soft)}
.colors-lg{grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.colors-lg .color{padding:0;overflow:hidden}
.colors-lg .color img{aspect-ratio:16/9;object-fit:cover;width:100%}
.colors-lg .meta{display:flex;align-items:center;gap:12px;padding:12px 14px}
.colors-lg .meta .sw{width:40px;height:40px;margin:0}

/* Footer */
.ftr{background:#141311;color:#bdb8b0;padding:48px 0 110px;margin-top:56px;font-size:14px}
.ftr .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.ftr h3{color:#fff;font-size:15px}
.ftr a{color:#e9e5df;text-decoration:none}
.ftr a:hover{color:#fff;text-decoration:underline}
.ftr ul{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.ftr .copy{grid-column:1/-1;border-top:1px solid #2c2a27;padding-top:18px;font-size:13px;color:#8a857d}
@media (max-width:760px){.ftr .wrap{grid-template-columns:1fr}}

/* Floating contact */
.float{position:fixed;right:18px;bottom:22px;z-index:60;display:grid;gap:10px}
.float a{width:56px;height:56px;border-radius:50%;display:grid;place-items:center;color:#fff;box-shadow:0 6px 20px rgba(0,0,0,.25);text-decoration:none;font-weight:800;font-size:12px}
.float .fz{background:var(--zalo);animation:pulse 2.4s infinite}
.float .fp{background:var(--brand)}
.float svg{width:26px;height:26px}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(0,104,255,.5)}70%{box-shadow:0 0 0 14px rgba(0,104,255,0)}100%{box-shadow:0 0 0 0 rgba(0,104,255,0)}}
.mbar{display:none}
@media (max-width:700px){
  .float{display:none}
  .mbar{display:grid;grid-template-columns:1fr 1fr;gap:8px;position:fixed;left:0;right:0;bottom:0;z-index:60;padding:10px 12px calc(10px + env(safe-area-inset-bottom));background:#fff;border-top:1px solid var(--line);box-shadow:0 -4px 16px rgba(0,0,0,.06)}
  .mbar .btn{padding:12px 10px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
.price{display:flex;align-items:baseline;flex-wrap:wrap;gap:6px 12px;margin:4px 0 6px}
.price .now{font-size:2rem;font-weight:800;color:var(--brand-dark);line-height:1}
.price .old{color:var(--ink-3);text-decoration:line-through}
.price .off{background:var(--brand);color:#fff;font-weight:800;font-size:13px;padding:3px 8px;border-radius:999px}
.price .unit{color:var(--ink-2);font-size:14px}
.ship{font-size:13.5px;color:var(--ink-2);margin:0 0 18px}
.addon{margin-top:16px;background:#fff;border:1px dashed var(--line);border-radius:12px;padding:12px 14px;font-size:14.5px}
.addon s,.cta s{color:var(--ink-3)}
.ftr address a{color:#e9e5df}
.eyebrow svg{width:16px;height:16px;flex:none}
.toc a.btn{color:#fff}
.card svg{display:block}
@media (max-width:420px){.logo small{display:none}.hdr .btn-sm{padding:8px 12px;font-size:13px}}

/* dl2vietnam.com — cẩm nang */
.answer{font-size:1.12rem;color:var(--ink);background:#fff;border-left:4px solid var(--brand);border-radius:12px;padding:16px 18px;margin:0 0 20px;box-shadow:var(--shadow)}
.stars{white-space:nowrap;color:var(--brand);letter-spacing:2px}
.sw{display:block}
.chip .sw,.colors-lg .meta .sw{display:block}
.gal4{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.gal4 a{border-radius:12px;overflow:hidden;display:block}
.gal4 img{width:100%;height:100%;object-fit:cover}
@media (max-width:700px){.gal4{grid-template-columns:1fr 1fr}}
.tbl{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;font-size:15px}
.tbl th,.tbl td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left}
.tbl th{background:#fcfaf7;font-size:13px;text-transform:uppercase;letter-spacing:.04em;color:var(--ink-3)}
.tbl tr:last-child td{border-bottom:0}
.vs{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.vs>div{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px}
.vs .sw{width:100%;height:46px;margin-bottom:10px}
.prod{display:grid;grid-template-columns:200px 1fr;gap:20px;align-items:center;background:#fff;border:2px solid var(--brand-soft);border-radius:18px;padding:18px}
.prod img{border-radius:12px}
.tips{counter-reset:t;list-style:none;padding:0;display:grid;gap:10px}
.tips li{counter-increment:t;display:flex;gap:12px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 14px}
.tips li::before{content:counter(t);flex:none;width:28px;height:28px;border-radius:50%;background:var(--brand-soft);color:var(--brand-dark);font-weight:800;display:grid;place-items:center}
.hero-photo{border-radius:22px;overflow:hidden;box-shadow:var(--shadow)}
.guide{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.guide>div{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}
@media (max-width:760px){.vs,.guide{grid-template-columns:1fr}.prod{grid-template-columns:1fr}}