:root{
  --bg:#f6f7f9; --card:#ffffff; --ink:#15171a; --mut:#6b7280; --line:#e7e9ee;
  --accent:#e60023; --accent2:#ff3355; --green:#0a8a3c; --gold:#f59e0b;
  --shadow:0 1px 2px rgba(16,24,40,.06),0 8px 24px rgba(16,24,40,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Hiragino Kaku Gothic ProN",
    "Noto Sans JP","Segoe UI",Meiryo,sans-serif;
  line-height:1.5;-webkit-font-smoothing:antialiased;
}
a{color:inherit}
.wrap{max-width:1280px;margin:0 auto;padding:0 16px}

/* Header */
header{
  position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line);
}
.head-in{padding:14px 0 0}
.prnote{margin:0 0 6px;font-size:12px;color:#6b7280;font-weight:600}
.brand{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.brand h1{margin:0;font-size:19px;font-weight:800;letter-spacing:-.01em}
.brand .live{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--accent);font-weight:700}
.brand .live::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--accent);animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.sub{color:var(--mut);font-size:13px;margin:4px 0 12px}
.tools{display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding-bottom:10px}
.search{flex:1;min-width:220px;display:flex;align-items:center;gap:8px;background:#f1f2f5;
  border:1px solid var(--line);border-radius:12px;padding:9px 12px}
.search input{border:0;background:transparent;outline:0;width:100%;font-size:14px;color:var(--ink)}
.sortwrap label{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--mut);font-weight:700;white-space:nowrap}
.sortwrap select{border:1px solid var(--line);background:#fff;color:var(--ink);font-size:13px;
  font-weight:600;padding:8px 10px;border-radius:11px;cursor:pointer;outline:0}
.catbtn{display:none;width:100%;align-items:center;justify-content:space-between;gap:8px;
  background:#fff;border:1px solid var(--line);color:var(--ink);font-size:14px;font-weight:700;
  padding:11px 14px;border-radius:12px;cursor:pointer;margin-bottom:10px}
.catbtn #catcur{color:var(--accent)}
.catbtn .caret{transition:transform .2s}
.catbtn[aria-expanded="true"] .caret{transform:rotate(180deg)}
.filters{display:flex;gap:8px;overflow-x:auto;padding:0 0 12px;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.filters::-webkit-scrollbar{display:none}
.chip{white-space:nowrap;border:1px solid var(--line);background:#fff;color:var(--ink);
  padding:7px 14px;border-radius:999px;font-size:13px;font-weight:600;cursor:pointer;transition:.15s}
.chip:hover{border-color:#cdd1da}
.chip.active{background:var(--ink);border-color:var(--ink);color:#fff}
.chip .n{opacity:.6;font-weight:600;margin-left:4px}
.chip.active .n{opacity:.8}

/* Grid */
main{padding:18px 0 60px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;
  display:flex;flex-direction:column;box-shadow:var(--shadow);transition:transform .14s,box-shadow .14s}
.card:hover{transform:translateY(-4px);box-shadow:0 10px 30px rgba(16,24,40,.12)}
.card.hidden{display:none}
.thumb{position:relative;aspect-ratio:1/1;background:#fff;border-bottom:1px solid var(--line)}
.thumb img{width:100%;height:100%;object-fit:contain;padding:6px}
.thumb .noimg{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#aab;font-size:12px}
.badge{position:absolute;top:10px;left:10px;background:var(--accent);color:#fff;font-size:12px;
  font-weight:800;padding:4px 10px;border-radius:9px;box-shadow:0 2px 8px rgba(230,0,35,.35)}
.cd{position:absolute;left:10px;right:10px;bottom:10px;display:flex;align-items:center;gap:6px;
  background:rgba(21,23,26,.86);color:#fff;font-size:12px;font-weight:700;padding:5px 9px;border-radius:9px}
.cd .lbl{opacity:.8;font-weight:600}
.cd .t{font-variant-numeric:tabular-nums;letter-spacing:.02em}
.cd.ended{background:rgba(107,114,128,.9)}
.cd.start{background:rgba(10,138,60,.92)}
.cd.urgent{background:var(--accent);box-shadow:0 0 0 2px rgba(230,0,35,.35);animation:blink 1.1s steps(2,start) infinite}
.cd.urgent .lbl{opacity:1;font-weight:800}
@keyframes blink{50%{opacity:.4}}
.body{padding:11px 13px 13px;display:flex;flex-direction:column;gap:6px;flex:1}
.price{font-size:22px;font-weight:800;color:var(--accent);letter-spacing:-.02em}
.price .yen{font-size:14px;font-weight:700;margin-left:1px}
.meta{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12px}
.ship{color:var(--green);font-weight:700}
.rate{color:var(--gold);font-weight:600}
.rate .rv{color:var(--mut);font-weight:500}
.name{font-size:12.5px;color:#33373d;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
  overflow:hidden;min-height:2.4em}
.cat{font-size:11px;color:var(--mut)}
.actions{margin-top:auto;display:flex;gap:8px}
.buy{flex:1;display:flex;align-items:center;justify-content:center;gap:6px;
  background:var(--accent);color:#fff;text-decoration:none;padding:10px;border-radius:11px;
  font-weight:800;font-size:13.5px;transition:.15s}
.buy:hover{background:#c80020}
.share{flex:0 0 44px;border:1px solid var(--line);background:#fff;border-radius:11px;
  font-size:16px;cursor:pointer;transition:.15s}
.share:hover{background:#f1f2f5;border-color:#cdd1da}
.share.copied{background:var(--green);border-color:var(--green)}
.empty{grid-column:1/-1;text-align:center;color:var(--mut);padding:70px 0}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(8px);
  background:var(--ink);color:#fff;padding:10px 18px;border-radius:999px;font-size:13px;
  font-weight:600;opacity:0;pointer-events:none;transition:.25s;z-index:50}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* Intro + FAQ (SEO content) */
.intro{color:#4b5563;font-size:14px;line-height:1.75;margin:2px 0 16px}
.intro strong{color:var(--ink)}
.faq{margin:38px auto 8px;max-width:820px}
.faq h2{font-size:18px;margin:0 0 14px}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:12px 16px;margin-bottom:10px;box-shadow:var(--shadow)}
.faq summary{font-weight:700;cursor:pointer;font-size:14px;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"＋ ";color:var(--accent);font-weight:800}
.faq details[open] summary::before{content:"− "}
.faq details p{color:#4b5563;font-size:13.5px;line-height:1.75;margin:10px 0 2px}

/* Footer */
footer{border-top:1px solid var(--line);background:#fff;color:var(--mut);font-size:12px}
footer .wrap{padding:22px 16px}
footer a{color:var(--accent);text-decoration:none}

/* Mobile: category thành nút bấm xổ ra toàn bộ */
@media(max-width:640px){
  .tools{flex-direction:column;align-items:stretch}
  .sortwrap{display:flex;justify-content:space-between}
  .sortwrap select{flex:1;margin-left:8px}
  .catbtn{display:flex}
  .filters{display:none;flex-wrap:wrap;overflow:visible;padding:0 0 12px;
    max-height:50vh;overflow-y:auto}
  .filters.open{display:flex}
  .chip{flex:0 0 auto}
}
@media(max-width:480px){
  .grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
  .price{font-size:19px}.brand h1{font-size:17px}
}