:root{--bg:#fffaf5;--card:#fff;--text:#1f2328;--muted:#5b616b;--brand:#e8440f;--brand-dark:#b9330a;--line:#ead9cc;--ok:#147a3d;--warn:#a15c00;--bad:#b42318;--radius:12px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;font-size:17px;line-height:1.6;color:var(--text);background:var(--bg)}
a{color:var(--brand-dark)}
.wrap{max-width:860px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:10}
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-top:10px;padding-bottom:10px}
.logo{font-weight:800;font-size:1.4rem;text-decoration:none;color:var(--text)}.logo span{color:var(--brand)}
.nav{display:flex;gap:14px;flex-wrap:wrap}.nav a{text-decoration:none;font-weight:600;color:var(--text);padding:6px 0}
.nav a:hover{color:var(--brand)}
main{padding:24px 0 40px}
h1{font-size:1.75rem;line-height:1.25;margin:.2em 0 .5em}
h2{font-size:1.3rem;margin:1.6em 0 .5em}
h3{font-size:1.1rem;margin:1.2em 0 .4em}
.lead{font-size:1.1rem;color:var(--muted)}
.hero{background:linear-gradient(135deg,#ffe8dc,#fff5ec);border:1px solid var(--line);border-radius:var(--radius);padding:22px 18px;margin-bottom:24px}
.cards{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:640px){.cards{grid-template-columns:repeat(2,1fr)}}
@media(min-width:860px){.cards.three{grid-template-columns:repeat(3,1fr)}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px}
.card h3{margin-top:0}.card p{margin:.3em 0 .8em;color:var(--muted)}
.btn,button{display:inline-block;background:var(--brand);color:#fff;border:0;border-radius:10px;padding:12px 18px;font-size:1rem;font-weight:700;text-decoration:none;cursor:pointer;min-height:44px}
.btn:hover,button:hover{background:var(--brand-dark)}
button.secondary{background:#fff;color:var(--brand-dark);border:1px solid var(--brand)}
button.link{background:none;color:var(--bad);padding:6px;min-height:auto;font-weight:600}
.tool{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin:16px 0}
.field{margin-bottom:14px}
.field label,fieldset legend{display:block;font-weight:600;margin-bottom:4px}
.hint{display:block;font-size:.88rem;color:var(--muted);font-weight:400}
input,select,textarea{width:100%;font-size:16px;padding:10px 12px;border:1px solid #c9b8aa;border-radius:8px;background:#fff;font-family:inherit}
input:focus,select:focus,textarea:focus{outline:3px solid #ffb999;border-color:var(--brand)}
fieldset{border:1px solid var(--line);border-radius:10px;padding:12px;margin:0 0 14px}
.grid2{display:grid;gap:0 12px;grid-template-columns:1fr}
@media(min-width:560px){.grid2{grid-template-columns:1fr 1fr}}
.btn-link{display:inline-flex;align-items:center;min-height:44px;padding:0 16px;border-radius:8px;border:1px solid var(--brand);color:var(--brand-dark);background:#fff;font-weight:600;text-decoration:none}
.share{margin-top:14px;padding-top:10px;border-top:1px dashed #bfe3cb}
.share-text{word-break:break-word;font-size:.9rem}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}
.result{margin-top:18px;padding:14px;border-radius:10px;background:#f6fbf7;border:1px solid #bfe3cb}
.result.error{background:#fff4f3;border-color:#f3c3be;color:var(--bad)}
.result .big{font-size:1.6rem;font-weight:800;color:var(--ok)}
.table-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left;vertical-align:top}
th{background:#fff3ea}
.tag{display:inline-block;font-size:.8rem;font-weight:700;padding:2px 8px;border-radius:99px;background:#e6f4ea;color:var(--ok)}
.tag.warn{background:#fff3dc;color:var(--warn)}.tag.bad{background:#fde8e6;color:var(--bad)}
.note{border-left:4px solid var(--brand);background:#fff;padding:10px 14px;border-radius:0 8px 8px 0;margin:16px 0}
.small{font-size:.88rem;color:var(--muted)}
.breadcrumb{font-size:.9rem;color:var(--muted);margin-bottom:8px}
.site-footer{border-top:1px solid var(--line);background:#fff;padding:20px 0;font-size:.95rem}
.footer-nav{display:flex;flex-wrap:wrap;gap:8px 16px;margin:8px 0}
ol li,ul li{margin-bottom:.3em}
.deal-cta{background:linear-gradient(135deg,#ffe8dc,#fff5ec);border:2px solid var(--brand);border-radius:var(--radius);padding:18px 16px;margin:20px 0}
.deal-cta h2{margin-top:0;color:var(--brand-dark)}
.deal-form{display:grid;gap:4px;max-width:520px}
.deal-form .field.check{display:flex;gap:10px;align-items:flex-start}
.deal-form .field.check input{width:22px;height:22px;flex:0 0 22px;margin:2px 0 0}
.deal-form .field.check label{font-weight:400}
.deal-form button{justify-self:start}
.deal-msg.error{color:var(--bad)}.deal-msg.ok{color:var(--ok)}
.tool .field.check{display:flex;gap:10px;align-items:center;align-self:end}
.tool .field.check input{width:22px;height:22px;flex:0 0 22px;margin:0}
.tool .field.check label{margin:0}
.deal .btn{margin-top:4px}
.card.deal{display:flex;flex-direction:column;position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);transition:transform .15s ease,box-shadow .15s ease}
.card.deal:hover{box-shadow:0 4px 14px rgba(0,0,0,.06)}
.deal-header{display:flex;align-items:center;flex-wrap:wrap;gap:6px 8px;margin-bottom:6px}
.deal-merchant{display:inline-block;font-size:.82rem;font-weight:800;color:var(--brand-dark);background:#ffeae1;border-radius:6px;padding:2px 8px;text-transform:uppercase;letter-spacing:.02em}
.deal-type{font-size:.85rem;color:var(--muted);font-weight:600}
.tag.tag-deal-featured{background:linear-gradient(135deg,#fff1e5,#ffe2cc);color:#c0390a;border:1px solid #f9986b;font-weight:800;letter-spacing:.01em}
.tag.tag-deal-featured::before{content:"★ ";color:#e8440f}
.tag.tag-deep-discount{background:linear-gradient(135deg,#ffebee,#fed4d9);color:#b71c1c;border:1px solid #f87171;font-weight:800;letter-spacing:.01em}
.tag.tag-deep-discount::before{content:"🔥 ";color:#dc2626}
.deal-media{position:relative;width:100%;overflow:hidden;border-radius:8px;background:linear-gradient(135deg,#fff8f5,#fff);margin:6px 0 10px;aspect-ratio:16/9;border:1px solid #fedbd0}
.deal-img{display:block;width:100%;height:100%;object-fit:cover;border-radius:8px;transition:transform .2s ease}
.card.deal:hover .deal-img{transform:scale(1.02)}
.deal-coupon-box{display:flex;align-items:center;justify-content:space-between;background:linear-gradient(135deg,#fff8f5,#fff1eb);border:1px dashed #f59f80;border-radius:8px;padding:8px 12px;margin:8px 0 10px}
.deal-coupon-val{font-size:1.1rem;font-weight:800;color:var(--brand);letter-spacing:-.01em}
.deal-coupon-type{font-size:.78rem;font-weight:700;color:var(--muted);background:#fff;padding:2px 8px;border-radius:6px;border:1px solid #fedbd0}
.card.deal h3{margin:.2em 0 .4em;font-size:1.15rem;line-height:1.35}
.card.deal p{margin:.2em 0 .6em}
.card.deal .btn{display:flex;align-items:center;justify-content:center;gap:6px;width:100%;min-height:46px;margin-top:auto;text-align:center;font-weight:700;font-size:1rem;border-radius:10px;background:linear-gradient(180deg,#f15421,var(--brand-dark));box-shadow:0 2px 6px rgba(232,68,15,.2);text-decoration:none;transition:filter .15s ease,transform .1s ease}
.card.deal .btn:hover{filter:brightness(1.08)}
.card.deal .btn:active{transform:scale(.98)}
/* Bộ lọc nhanh voucher theo sàn TMĐT trên mobile & desktop */
.deal-chips-wrap{margin-bottom:14px}
.deal-chips-label{display:block;font-size:.88rem;font-weight:700;color:var(--text);margin-bottom:6px}
.deal-platform-chips{display:flex;gap:8px;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding:2px 2px 8px;margin:0}
.deal-platform-chips::-webkit-scrollbar{display:none}
.deal-chip{display:inline-flex;align-items:center;justify-content:center;gap:6px;flex:0 0 auto;padding:8px 16px;border-radius:24px;border:1.5px solid #fedbd0;background:#fff;color:var(--text);font-size:.9rem;font-weight:700;cursor:pointer;touch-action:manipulation;transition:all .15s ease;min-height:44px;line-height:1}
.deal-chip:hover{border-color:var(--brand);background:#fff8f5}
.deal-chip.active,.deal-chip:active{background:linear-gradient(180deg,#f15421,var(--brand-dark));color:#fff;border-color:var(--brand-dark);box-shadow:0 2px 8px rgba(232,68,15,.25)}
.deal-chip .badge-count{display:inline-block;font-size:.75rem;padding:2px 6px;border-radius:12px;background:#ffeae1;color:var(--brand-dark);margin-left:4px}
.deal-chip.active .badge-count{background:rgba(255,255,255,.25);color:#fff}
@media(max-width:639px){
  .hot-deals{gap:16px}
  .card.deal{padding:16px 14px}
  .deal-header{gap:6px}
  .deal-merchant{font-size:.8rem}
  .deal-coupon-box{padding:10px 12px;margin:8px 0 12px}
  .deal-coupon-val{font-size:1.15rem}
  .deal-media{margin:6px 0 10px;aspect-ratio:16/9}
  .deal-img{width:100%;height:auto}
  .card.deal h3{font-size:1.1rem;line-height:1.35}
  .card.deal .btn{min-height:48px;font-size:1.02rem;padding:12px 14px}
  .deal-platform-chips{gap:8px;padding-bottom:10px}
  .deal-chip{min-height:48px;padding:10px 16px;font-size:.92rem}
}
.deal-guide-card{background:linear-gradient(135deg,#fffdfa,#fff5ec);border:1px dashed var(--brand)}
.steps li{margin-bottom:.6em}
.btn.secondary-btn{background:#fff;color:var(--brand-dark);border:1px solid var(--brand);margin-left:6px}
.btn.secondary-btn:hover{background:#fff3ea}
.related-tools{background:#fff;border:2px solid var(--brand);border-radius:var(--radius);padding:14px 16px;margin:24px 0}
.related-tools h2{margin:0 0 .4em;font-size:1.15rem;color:var(--brand-dark)}
.related-tools ul{margin:0;padding-left:1.2em}
.related-tools li{margin-bottom:.5em}
.related-tools .go{white-space:nowrap;font-weight:700}
.tool-callout{border:1px solid var(--brand);background:#fff3ea;border-radius:10px;padding:10px 14px;margin:16px 0}
.quick-tools{display:flex;flex-wrap:wrap;gap:8px 10px;margin:14px 0 4px;padding:0;list-style:none}
.quick-tools li{margin:0}
.quick-tools a{display:inline-block;background:#fff;border:1px solid var(--brand);border-radius:99px;padding:8px 14px;font-weight:700;text-decoration:none;min-height:44px;line-height:26px}
.quick-tools a:hover{background:#fff3ea}
.card .tool-link{font-size:.95rem;font-weight:600}

/* Bảng giá vàng & Biến động giá thị trường */
.gold-board-wrap{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 16px;margin:20px 0}
.market-meta{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.market-time{font-size:.9rem;color:var(--muted);font-weight:600}
.market-actions{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0 16px}
.btn-action{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 16px;border-radius:10px;border:1px solid var(--brand);font-weight:700;font-size:.95rem;cursor:pointer;background:#fff;color:var(--brand-dark);text-decoration:none;transition:background .15s ease,box-shadow .15s ease}
.btn-action:hover{background:#fff3ea}
.btn-action.btn-bookmark{background:linear-gradient(180deg,#fffdfa,#fff2ea);border-color:#f59f80}
.btn-action.btn-bookmark.bookmarked{background:#e6f4ea;color:var(--ok);border-color:#bfe3cb}
.market-msg{display:none;padding:10px 14px;border-radius:8px;font-size:.9rem;font-weight:600;margin-top:8px}
.market-msg.show{display:block}
.market-msg.ok{background:#f6fbf7;color:var(--ok);border:1px solid #bfe3cb}
.market-msg.info{background:#fff8f0;color:var(--brand-dark);border:1px solid #fedbd0}
.gold-table{width:100%;border-collapse:collapse;margin-top:8px;font-size:.95rem}
.gold-table th{background:#fff3ea;font-weight:700;color:var(--text);padding:10px 8px;border-bottom:2px solid var(--line)}
.gold-table td{padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:middle}
.gold-table tr:hover{background:#fffaf6}
.gold-name{font-weight:700;color:var(--text);display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.gold-brand-pill{font-size:.75rem;font-weight:800;padding:2px 6px;border-radius:4px;background:#ffeae1;color:var(--brand-dark);text-transform:uppercase}
.gold-price{font-weight:700;font-variant-numeric:tabular-nums;color:var(--text)}
.gold-price.buy{color:#b9330a}
.gold-price.sell{color:#147a3d}
.gold-spread{font-size:.88rem;color:var(--muted);font-variant-numeric:tabular-nums}
.trend{display:inline-flex;align-items:center;gap:3px;font-size:.82rem;font-weight:700;padding:3px 8px;border-radius:6px;white-space:nowrap}
.trend.trend-up{background:#e6f4ea;color:var(--ok)}
.trend.trend-down{background:#fde8e6;color:var(--bad)}
.trend.trend-flat{background:#f1f3f5;color:var(--muted)}
.gold-cards{display:none}
.gold-card-item{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px;margin-bottom:12px;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.gold-card-head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:10px}
.gold-card-title{font-weight:700;font-size:1.02rem;color:var(--text)}
.gold-card-prices{display:grid;grid-template-columns:1fr 1fr;gap:8px;background:#fffaf5;border:1px solid var(--line);border-radius:8px;padding:10px;margin-bottom:8px}
.gold-price-box{display:flex;flex-direction:column}
.gold-price-label{font-size:.78rem;font-weight:600;color:var(--muted);text-transform:uppercase}
.gold-price-val{font-size:1.1rem;font-weight:800}
.gold-price-val.buy{color:#b9330a}
.gold-price-val.sell{color:#147a3d}
.gold-card-foot{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:6px;font-size:.86rem;color:var(--muted)}
.gold-calc-result{margin-top:14px;padding:14px;border-radius:10px;background:#f6fbf7;border:1px solid #bfe3cb}
.gold-calc-result .big-prices{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:10px 0}
.gold-res-box{background:#fff;border:1px solid #bfe3cb;border-radius:8px;padding:10px 12px}
.gold-res-box .label{font-size:.8rem;color:var(--muted);font-weight:600}
.gold-res-box .value{font-size:1.3rem;font-weight:800;color:var(--ok);margin-top:2px}
.gold-res-box .value.buy{color:#b9330a}
.gold-filter-bar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:12px 0 16px}
.gold-filter-bar label{font-weight:600;font-size:.92rem;margin:0}
.gold-filter-bar select{width:auto;min-width:140px;padding:8px 10px;font-size:.92rem}

@media(max-width:639px){
  .market-actions{flex-direction:column;gap:8px}
  .btn-action{width:100%;min-height:48px;font-size:1rem;justify-content:center}
  .gold-table-container{display:none}
  .gold-cards{display:block}
  .gold-filter-bar select{width:100%}
  .gold-calc-result .big-prices{grid-template-columns:1fr;gap:8px}
  .gold-res-box .value{font-size:1.2rem}
}
.faq{margin:28px 0}
.faq h2{margin-bottom:.8em}
.faq-item{margin-bottom:14px;padding:14px 16px;background:#fff;border:1px solid #fedbd0;border-radius:10px;box-shadow:0 1px 3px rgba(0,0,0,.03)}
.faq-item h3{margin:0 0 .4em;font-size:1.06rem;color:var(--brand-dark);line-height:1.4}
.faq-item p{margin:0;line-height:1.6}
.deal-type-chips{margin-top:2px}

.hot-badge{display:inline-block;font-size:.65rem;font-weight:700;line-height:1;padding:3px 6px;border-radius:10px;background:#d92d20;color:#fff;margin-left:4px;vertical-align:middle;letter-spacing:.03em}
.sale-banner{background:linear-gradient(135deg,#e8440f,#b8320a);color:#fff;border-radius:var(--radius);padding:20px 18px;margin-bottom:18px}
.sale-banner h2{margin:6px 0;color:#fff}
.sale-banner p{margin:0 0 12px}
.sale-banner .btn{background:#fff;color:var(--brand-dark)}
.sale-banner .hot-badge{background:#fff;color:#d92d20;margin-left:0}