:root{--bg:#0d0b0a;--card:#1a1614;--red:#e50914;--yellow:#ffc400;--text:#eee;--mute:#9a928c}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:inherit}
.wrap{max-width:480px;margin:0 auto;padding:0 16px 40px}
header.top{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;max-width:480px;margin:0 auto}
.logo{font-weight:900;font-size:22px;letter-spacing:1px;text-decoration:none}
.logo b{color:var(--red)}
.cart-link{text-decoration:none;font-size:15px;padding:10px 12px;min-height:44px;display:inline-flex;align-items:center}
.badge{background:var(--red);color:#fff;border-radius:10px;font-size:12px;padding:1px 7px;margin-left:6px;display:none}
h1{font-size:22px;margin:8px 0 12px}
.card{display:flex;flex-direction:column;gap:10px;background:var(--card);border-radius:10px;padding:10px;margin-bottom:12px;text-decoration:none}
/* bìa giữ nguyên tỉ lệ ảnh gốc (bìa YouTube 16:9, bìa sách 3:4…) — không cắt, không bóp */
.card img,.cover{display:block;width:100%;height:auto;border-radius:6px;background:#2a2421;flex:none}
div.cover{aspect-ratio:16/9}
.card .t{font-weight:700}
.mute{color:var(--mute);font-size:14px}
.price{color:var(--yellow);font-weight:800}
.btn{display:flex;align-items:center;justify-content:center;min-height:48px;width:100%;border:0;border-radius:8px;background:var(--red);color:#fff;font:700 16px system-ui,sans-serif;text-decoration:none;cursor:pointer;margin:10px 0}
.btn.alt{background:transparent;border:1px solid #555;color:var(--text)}
.btn[disabled]{opacity:.4}
.hero{display:flex;flex-direction:column;gap:12px;margin-bottom:10px}
.admin .hero{flex-direction:row}
.admin .hero .cover{width:160px}
.note{background:var(--card);border-left:3px solid var(--yellow);padding:10px 12px;border-radius:6px;margin:12px 0;font-size:14px}
.err{background:#3a0d10;border:1px solid var(--red);padding:10px 12px;border-radius:6px;margin:12px 0}
input[type=email]{width:100%;min-height:48px;border-radius:8px;border:1px solid #444;background:#15110f;color:var(--text);padding:0 12px;font-size:16px}
.row{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:10px 0;border-bottom:1px solid #2a2421}
.row button{background:none;border:0;color:var(--mute);min-height:44px;min-width:44px;font-size:14px}
.qr{display:block;width:100%;max-width:300px;margin:12px auto;background:#fff;border-radius:8px}
.kv{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:8px 0;border-bottom:1px solid #2a2421}
.kv button{min-height:44px;padding:0 12px;border-radius:6px;border:1px solid #555;background:transparent;color:var(--text)}
.reader p{font-size:18px;line-height:1.8;margin:0 0 1em}
.nav{display:flex;gap:10px}
.nav .btn{flex:1}
/* admin */
.banner-red{background:var(--red);color:#fff;padding:10px 16px;text-align:center;font-weight:700}
.admin-wrap{max-width:720px}
.admin-top{max-width:720px;flex-wrap:wrap;gap:8px}
.admin-nav{display:flex;gap:4px;flex-wrap:wrap;align-items:center}
.admin-nav a,.linkbtn{padding:10px;min-height:44px;display:inline-flex;align-items:center;text-decoration:none;font-size:15px;background:none;border:0;color:var(--text);cursor:pointer}
.ord{background:var(--card);border-radius:10px;padding:12px;margin-bottom:12px}
.ord .acts{display:flex;gap:8px}.ord .acts form{flex:1}
.st{font-size:12px;padding:2px 8px;border-radius:10px;background:#333}
.st-pending{background:var(--yellow);color:#000}.st-paid{background:#c76a00}.st-delivered{background:#1f7a3a}
label{display:block;margin:10px 0;font-size:14px;color:var(--mute)}
input[type=text],input:not([type]),input[type=password],input[type=file],textarea,select{width:100%;min-height:48px;border-radius:8px;border:1px solid #444;background:#15110f;color:var(--text);padding:8px 12px;font-size:16px;margin-top:4px}
details{margin-top:10px}summary{cursor:pointer;min-height:44px;display:flex;align-items:center}