:root{--primary:#c4320a;--primary-press:#9e2708;--primary-ink:#fff;
--primary-text:#9e2708;--primary-tint:#fef4ee;--accent:#b45309;--accent-ink:#7e2109;
--ink:#1a1f36;--body:#3c4257;--muted:#66707f;--line:#e6e8eb;--canvas:#fff7f0;
--canvas-alt:#fff0e6;--surface:#fff;--surface-press:#f6f8fa;--celebrate:#f0b429}
*{box-sizing:border-box;margin:0;padding:0}
body{font:16px/1.65 'Be Vietnam Pro',-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
background:linear-gradient(172deg,var(--canvas),var(--canvas-alt));background-attachment:fixed;color:var(--ink)}
a{color:inherit;text-decoration:none}
.nav{max-width:1120px;margin:0 auto;display:flex;align-items:center;gap:16px;padding:18px 24px}
.brand{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:800;letter-spacing:-.02em}
.nav nav{margin-left:auto;display:flex;align-items:center;gap:18px;font-size:15px;color:var(--body)}
/* A solid bottom edge, and the control travels on press. That edge is the
   direction's signature — see DESIGN.md §Elevation & Depth. Dark ink, never
   white: white on mint measures 1.93:1. */
.cta{background:var(--primary);color:var(--primary-ink);border-radius:16px;padding:13px 22px;font-weight:800;
min-height:52px;display:inline-flex;align-items:center;position:relative;top:0;
box-shadow:0 5px 0 var(--primary-press);transition:top 70ms ease,box-shadow 70ms ease}
.cta:active{top:4px;box-shadow:0 1px 0 var(--primary-press)}
.cta:focus-visible{outline:3px solid #238c85;outline-offset:2px}
@media(prefers-reduced-motion:reduce){.cta{transition-duration:.01ms}}
.cta.big{padding:14px 26px;font-size:16px}
main{max-width:1120px;margin:0 auto;padding:0 24px 60px}
.hero{text-align:center;padding:56px 0 40px}
.hero.small{padding:34px 0 26px}
.hero h1{font-size:40px;font-weight:800;letter-spacing:-.025em;line-height:1.15;margin-bottom:14px}
.hero.small h1{font-size:30px}
.hero p{color:var(--body);max-width:56ch;margin:0 auto 22px}
/* Hai cột từ 900px trở lên. Dưới mức đó ảnh xuống dưới chữ — lời hứa phải đọc
   được trước, ảnh chỉ để xác nhận nó. */
.hero{display:grid;gap:22px;align-items:center}
.hero-art{width:100%;max-width:420px;height:auto;justify-self:center}
@media(min-width:900px){
  .hero{grid-template-columns:1fr 420px;gap:48px;text-align:left}
  .hero-copy p{margin-left:0}
  .hero h1{margin-left:0}
}
.note{font-size:13px;color:var(--muted);margin-top:12px}
.chips{display:flex;gap:9px;justify-content:center;flex-wrap:wrap;margin-top:16px}
.chip{background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-size:14px;color:var(--body)}
.why{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:20px 0 50px}
.why div{background:var(--surface);border-radius:16px;padding:22px;box-shadow:0 2px 10px rgba(15,118,110,.08)}
.why h2{font-size:17px;margin-bottom:6px}
.why p{font-size:14px;color:var(--body)}
.library h2{font-size:22px;margin-bottom:16px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(258px,1fr));gap:18px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden}
/* Khung VUÔNG. Ảnh là ảnh chụp sân khấu thật, và sân khấu cao khác nhau tuỳ
   trò — 460px với vòng quay, 526px với ba trò còn lại. Khung vuông cắt nhiều
   nhất 9% ở mép, mà trò chơi thì luôn nằm giữa, nên không mất gì đáng kể và
   lưới thẻ vẫn đều. */
.thumb{display:block;width:100%;aspect-ratio:1;height:auto;object-fit:cover;background:var(--primary-tint)}



.card .body{padding:15px 16px}
.card h3{font-size:16px;margin-bottom:4px}
.card p{font-size:13.5px;color:var(--body);min-height:40px;margin-bottom:10px}
.tag{background:var(--primary-tint);color:var(--primary);border-radius:8px;padding:3px 9px;font-size:11.5px;font-weight:700}
.crumbs{font-size:13.5px;color:var(--muted);padding:8px 0 18px}
.crumbs a{color:var(--primary);font-weight:600}
.detail{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:34px;align-items:start}
.detail h1{font-size:30px;letter-spacing:-.02em;margin-bottom:8px}
.lede{color:var(--body);margin-bottom:26px}
.detail h2{font-size:17px;margin-bottom:10px}
.spec{width:100%;border:1px solid var(--line);border-radius:22px;border-collapse:separate;border-spacing:0;overflow:hidden;background:var(--surface)}
.spec th{text-align:left;width:190px;padding:11px 15px;color:var(--body);font-weight:500;font-size:14px;border-bottom:1px solid var(--line)}
.spec td{padding:11px 15px;font-size:14px;font-weight:500;border-bottom:1px solid var(--line)}
.spec tr:last-child th,.spec tr:last-child td{border-bottom:0}
aside{text-align:center}
.phone{background:var(--surface);border-radius:26px;padding:22px 18px;box-shadow:0 12px 32px rgba(16,32,30,.14);margin-bottom:18px}
.screen{width:170px;height:170px;margin:0 auto 12px;border:6px solid #fff;box-shadow:0 6px 20px rgba(0,0,0,.16)}
.screen.wheel{border-radius:50%;background:conic-gradient(#e8377d 0 60deg,#fadce8 60deg 120deg,#e8377d 120deg 180deg,#fadce8 180deg 240deg,#e8377d 240deg 300deg,#fadce8 300deg 360deg)}
.screen.scratch{border-radius:22px;background:linear-gradient(120deg,#c9a227,#f2d06b)}
.phone p{font-size:14px;font-weight:700}
.foot{max-width:1120px;margin:0 auto;padding:26px 24px 40px;color:var(--muted);font-size:13.5px;border-top:1px solid var(--line)}
@media (max-width:820px){.why,.detail{grid-template-columns:1fr}.hero h1{font-size:30px}}