*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: var(--scheme, dark); }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.55 var(--font); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 5vw, 3.4rem); }
h2 { font-size: 1.4rem; }
h3 { font-size: 1rem; margin-top: 1.2em; }
.muted { color: var(--muted); }
.mono { font-family: ui-monospace, Consolas, monospace; font-size: .85rem; word-break: break-all; }

.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 24px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--bg); z-index: 5; }
.top nav { display: flex; align-items: center; gap: 20px; }
.top nav a { text-decoration: none; color: var(--muted); }
.top nav a:hover { color: var(--fg); }
.brand { font-weight: 700; font-size: 1.15rem; text-decoration: none; letter-spacing: .01em; }

main { max-width: 1080px; margin: 0 auto; padding: 0 24px 80px; }
section { margin-top: 56px; }
.hero { margin-top: 72px; max-width: 720px; }
.sub { color: var(--muted); font-size: 1.1rem; }

.studio { border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; background: var(--panel); }
textarea, input, select { width: 100%; background: var(--field); color: var(--fg); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; font: inherit; }
textarea { resize: vertical; min-height: 110px; }
textarea:focus, input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 12px; }
.controls select { width: auto; }
.cost { margin-left: auto; color: var(--muted); }
.status { min-height: 1.4em; margin: 10px 0 0; color: var(--muted); }

.btn { background: var(--field); color: var(--fg); border: 1px solid var(--line); border-radius: 10px; padding: 10px 16px; font: inherit; cursor: pointer; text-decoration: none; display: inline-block; }
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); color: var(--on-accent); border-color: var(--accent); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.big { padding: 12px 26px; }
.btn:disabled { opacity: .5; cursor: progress; }
.link { background: none; border: 0; color: var(--muted); cursor: pointer; font: inherit; padding: 0; text-decoration: underline; }
.link:hover { color: var(--fg); }

.models { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.model { text-align: left; background: var(--panel); color: var(--fg); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; cursor: pointer; font: inherit; display: grid; gap: 4px; }
.model:hover { border-color: var(--muted); }
.model.on { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.mname { font-weight: 600; }
.mnote { color: var(--muted); font-size: .9rem; }
.mprice { font-variant-numeric: tabular-nums; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin-top: 14px; }
.card { margin: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--panel); }
.card img { display: block; width: 100%; height: auto; }
.card figcaption { display: flex; justify-content: space-between; padding: 8px 12px; font-size: .9rem; }

.code { background: var(--field); border: 1px solid var(--line); border-radius: 10px; padding: 14px; overflow-x: auto; font-size: .85rem; }
footer { max-width: 1080px; margin: 0 auto; padding: 24px; display: flex; justify-content: space-between; color: var(--muted); border-top: 1px solid var(--line); }

.dlg { background: var(--panel); color: var(--fg); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; width: min(420px, calc(100vw - 32px)); }
.dlg.wide { width: min(560px, calc(100vw - 32px)); }
.dlg::backdrop { background: rgba(0, 0, 0, .65); }
.stack { display: grid; gap: 12px; }
.row { display: flex; flex-wrap: wrap; gap: 10px; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: .9rem; }
.check input { width: auto; margin-top: 4px; }
.err { color: var(--danger); margin: 0; min-height: 1.2em; }
.keyrow { display: flex; gap: 12px; align-items: center; justify-content: space-between; }
.keyout { color: var(--accent); }

.gate { position: fixed; inset: 0; background: var(--bg); display: grid; place-items: center; z-index: 50; padding: 24px; text-align: center; }
.gate-box { max-width: 460px; display: grid; gap: 16px; }
.gate-box .row { justify-content: center; }

@media (max-width: 640px) {
  .top { padding: 12px 16px; }
  .top nav a { display: none; }
  main { padding: 0 16px 60px; }
  .cost { margin-left: 0; width: 100%; }
}

.codebox { text-align: center; font: 600 1.8rem ui-monospace, Consolas, monospace; letter-spacing: .5em; padding: 14px 10px 14px calc(10px + .5em); }

[hidden] { display: none !important; }
.preview { display: flex; align-items: center; gap: 12px; margin-top: 12px; padding: 10px; border: 1px dashed var(--line); border-radius: 12px; background: var(--field); }
.preview img { width: 64px; height: 64px; object-fit: cover; border-radius: 8px; }
.preview .muted { flex: 1; font-size: .9rem; }