:root {
  --bg: #0b1220; --panel: #111a2e; --line: #23314f; --text: #eef3ff; --muted: #94a3c4;
  --cyan: #00b8fc; --gold: #fbbf24; --bad: #ef4444;
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body { min-height: 100vh; background: radial-gradient(ellipse at 50% -10%, rgba(0,184,252,.18), transparent 55%), var(--bg); }
button { font: inherit; color: inherit; cursor: pointer; }
a { color: var(--cyan); }
img { max-width: 100%; }
[hidden] { display: none !important; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: .3em; min-height: 42px; padding: .5em 1em; border-radius: 10px;
  border: 1px solid var(--line); background: #17223b; color: var(--text); font-weight: 800; text-decoration: none; white-space: nowrap; }
.btn:hover { filter: brightness(1.12); }
.btn:disabled, .btn[aria-disabled="true"] { opacity: .45; cursor: default; filter: none; }
.btn.primary { background: var(--cyan); border-color: var(--cyan); color: #04131f; }
.btn.store { background: linear-gradient(135deg, #00b8fc, #7c3aed); border: 0; color: #fff; }
.btn.ghost { background: transparent; }
.btn.sm { min-height: 36px; padding: .35em .7em; font-size: .85rem; }
.btn.big { min-height: 52px; font-size: 1.05rem; width: 100%; }

/* 頂部 */
.top { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 10px max(16px, env(safe-area-inset-left)); padding-top: max(10px, env(safe-area-inset-top)); background: rgba(7,12,24,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 900; }
.brand img { height: 28px; width: auto; }
.brand span { font-size: 1.05rem; padding-left: 10px; border-left: 1px solid var(--line); }
.cart-btn { position: relative; display: flex; align-items: center; gap: 6px; height: 44px; padding: 0 14px; border-radius: 12px; border: 2px solid var(--cyan); background: #0f1d33; font-weight: 800; }
.cart-btn b { min-width: 24px; height: 24px; padding: 0 6px; border-radius: 999px; background: var(--cyan); color: #04131f; display: grid; place-items: center; font-size: .85rem; }
.cart-btn.bump { animation: bump .4s; }
@keyframes bump { 40% { transform: scale(1.15); } }

.intro { max-width: 1180px; margin: 0 auto; padding: 26px 16px 6px; }
.intro h1 { margin: 0 0 6px; font-size: clamp(1.6rem, 5vw, 2.4rem); }
.intro h1 span { color: var(--cyan); }
.intro p { margin: 0; color: var(--muted); line-height: 1.6; }
.intro b { color: var(--text); }
.intro .code { color: var(--gold); letter-spacing: .05em; }

.tools { position: sticky; top: 64px; z-index: 9; max-width: 1180px; margin: 0 auto; padding: 12px 16px; display: flex; flex-direction: column; gap: 10px; background: linear-gradient(180deg, var(--bg) 85%, transparent); }
.tabs { display: flex; flex-wrap: wrap; gap: 6px; }
.tabs button { padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line); background: #17223b; font-weight: 800; font-size: .9rem; }
.tabs button i { font-style: normal; margin-left: 6px; padding: 0 6px; border-radius: 999px; background: rgba(255,255,255,.12); font-size: .75rem; }
.tabs button.on { background: var(--cyan); border-color: var(--cyan); color: #04131f; }
.tabs button.on i { background: rgba(4,19,31,.2); }
#search { width: 100%; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--line); background: #0f1830; color: var(--text); font-size: 16px; }

main { max-width: 1180px; margin: 0 auto; padding: 0 16px 30px; }
.status { color: var(--muted); font-size: .9rem; margin: 4px 0 12px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 14px; }
.card { display: flex; flex-direction: column; border-radius: 14px; background: var(--panel); border: 1px solid var(--line); overflow: hidden; }
.card-main { display: flex; flex-direction: column; align-items: stretch; text-align: left; padding: 0 0 8px; border: 0; background: none; flex: 1; }
.card-img { display: grid; place-items: center; aspect-ratio: 4 / 3; background: linear-gradient(180deg, #eef6ff, #d7e3f3); }
.card-img img { width: 78%; height: 88%; object-fit: contain; transition: transform .2s; }
.card:hover .card-img img { transform: scale(1.05); }
.card-line { margin: 10px 12px 0; font-size: .72rem; color: var(--cyan); font-weight: 800; }
.card-name { margin: 2px 12px 0; font-size: 1.05rem; }
.card-title { margin: 2px 12px 0; font-size: .8rem; color: var(--muted); line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-var { margin: 6px 12px 0; font-size: .78rem; color: #86efac; font-weight: 700; }
.card.soldout .card-var { color: #fca5a5; }
.card.soldout .card-img img { opacity: .5; filter: grayscale(.6); }
.card-actions { display: grid; grid-template-columns: 1fr auto; gap: 6px; padding: 0 12px 12px; }

/* 對話框 */
.dlg { border: 1px solid var(--line); border-radius: 16px; background: var(--panel); color: var(--text); padding: 20px; width: min(760px, 94vw); max-height: 90dvh; overflow-y: auto; }
.dlg::backdrop { background: rgba(0,0,0,.65); }
.dlg h2 { margin: 0 0 10px; font-size: 1.2rem; line-height: 1.4; }
.x { position: sticky; float: right; top: 0; width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--line); background: #17223b; }
.d-wrap { display: grid; grid-template-columns: 260px 1fr; gap: 20px; align-items: start; }
.d-wrap > img { width: 100%; aspect-ratio: 1; object-fit: contain; border-radius: 14px; background: linear-gradient(180deg, #eef6ff, #d7e3f3); padding: 12px; }
.d-line { margin: 0 0 4px; color: var(--cyan); font-weight: 800; font-size: .85rem; }
.d-variants { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0 12px; }
.chip { padding: 7px 12px; border-radius: 10px; border: 2px solid var(--line); background: #17223b; font-weight: 700; }
.chip.on { border-color: var(--cyan); background: rgba(0,184,252,.15); }
.chip:disabled { opacity: .45; cursor: not-allowed; text-decoration: line-through; }
.chip small { margin-left: 4px; font-size: .7rem; }
.d-qty { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.d-qty span { color: var(--muted); }
.d-qty button, .c-qty button { width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--line); background: #17223b; font-size: 1.1rem; }
.d-qty button:disabled, .c-qty button:disabled { opacity: .4; }
.d-qty b { min-width: 24px; text-align: center; }
.d-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.d-note { margin: 10px 0 0; color: var(--muted); font-size: .8rem; line-height: 1.5; }
.detail h3 { margin: 18px 0 6px; color: var(--gold); font-size: 1rem; }
.d-features { margin: 0; padding-left: 1.2em; line-height: 1.6; font-size: .92rem; }
.d-features li { margin-bottom: 4px; }

.cart { width: min(560px, 94vw); }
.c-list { list-style: none; margin: 0; padding: 0; }
.c-list li { display: grid; grid-template-columns: 64px 1fr auto auto; align-items: center; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.c-list li.soldout { opacity: .55; }
.c-list img { width: 64px; height: 64px; object-fit: contain; border-radius: 10px; background: linear-gradient(180deg, #eef6ff, #d7e3f3); }
.c-info { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.c-info small { color: var(--muted); }
.c-info a { font-size: .78rem; }
.c-qty { display: flex; align-items: center; gap: 6px; }
.c-qty b { min-width: 20px; text-align: center; }
.c-del { width: 32px; height: 32px; border-radius: 8px; border: 0; background: transparent; color: var(--muted); }
.c-empty { color: var(--muted); text-align: center; padding: 20px 0; }
.c-foot { display: flex; flex-direction: column; gap: 10px; margin-top: 14px; }
.c-sum { margin: 0; font-weight: 800; }
.c-note { margin: 0; color: var(--muted); font-size: .82rem; line-height: 1.6; }
.c-note b { color: var(--text); }

.foot { max-width: 1180px; margin: 0 auto; padding: 10px 16px 40px; color: var(--muted); font-size: .82rem; line-height: 1.6; border-top: 1px solid var(--line); }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); padding: 10px 18px; border-radius: 999px; background: #14532d; border: 1px solid #22c55e; font-weight: 800; opacity: 0; pointer-events: none; transition: .2s; z-index: 50; max-width: 92vw; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 640px) {
  .brand img { height: 22px; }
  .brand span { font-size: .95rem; }
  .cart-btn span { display: none; }
  .tools { position: static; padding: 10px 12px; } /* 手機不黏頂，留空間看商品 */
  .tabs button { padding: 5px 10px; font-size: .82rem; }
  main { padding: 0 12px 24px; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .card-actions { grid-template-columns: 1fr; }
  .card-name { font-size: .95rem; }
  .d-wrap { grid-template-columns: 1fr; }
  .d-wrap > img { max-width: 220px; margin: 0 auto; }
  .dlg { padding: 16px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }