:root { --bg:#0b0b0c; --card:#15161a; --muted:#a8b0bd; --accent:#ff4fd8; --ring:#2a2d36; --white:#fff; }
*{box-sizing:border-box}
body{margin:0;background:linear-gradient(180deg,#0b0b0c,#121317);color:var(--white);font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto}
.wrap{max-width:980px;margin:40px auto;padding:20px}
h1{font-size:28px;margin:0 0 12px}
.hint{color:var(--muted)}

.controls{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:14px 0 16px}
label{display:inline-flex;align-items:center;gap:8px;padding:8px 10px;background:var(--card);border:1px solid var(--ring);border-radius:10px}
label.file{cursor:pointer}
label.file input{display:none}
select{background:#0f1013;color:#fff;border:1px solid var(--ring);border-radius:8px;padding:6px 10px}
button{background:var(--accent);color:#000;border:0;border-radius:10px;padding:10px 14px;font-weight:700;cursor:pointer}
button[disabled]{opacity:.5;cursor:not-allowed}

.preview{border:1px dashed var(--ring);border-radius:14px;min-height:260px;padding:16px;background:rgba(255,255,255,.02)}
.preview.empty{display:flex;align-items:center;justify-content:center}
.grid{display:grid;gap:8px;margin:6px auto 0;max-width:780px}
.tileWrap{position:relative}
.tileWrap canvas{width:100%;height:auto;background:#0f1013;border-radius:10px;border:1px solid var(--ring)}
.badge{position:absolute;top:6px;left:6px;background:rgba(0,0,0,.6);backdrop-filter:blur(4px);color:#fff;font-size:12px;padding:2px 6px;border-radius:6px}

.actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:14px 0}
#singles{display:flex;flex-wrap:wrap;gap:8px}
#singles a{display:inline-flex;align-items:center;gap:6px;padding:8px 10px;background:var(--card);border:1px solid var(--ring);border-radius:10px;color:#fff;text-decoration:none;font-size:14px}

/* Guide */
.guide{background:var(--card);border:1px solid var(--ring);border-radius:14px;padding:14px;margin:10px 0 18px}
.guide h2{font-size:18px;margin:0 0 6px}
.guide code{background:#0f1013;padding:2px 6px;border-radius:6px}
.guide-list{display:grid;grid-template-columns:repeat(2,minmax(220px,1fr));gap:12px}
.guide-item{display:flex;gap:10px;align-items:center;background:#0f1013;border:1px solid #303444;border-radius:12px;padding:10px}
.mini{flex:0 0 116px;width:116px;background:#10131b;border:1px solid #3a4152;border-radius:10px;display:grid;gap:4px;padding:4px}
.rect{background:#2b2f3a;border:1px solid #8a90a2;border-radius:5px;width:100%;aspect-ratio:1080/1350;box-shadow:inset 0 0 0 1px rgba(255,255,255,.06)}
.meta{display:flex;flex-direction:column;gap:2px}
.meta b{font-size:14px}
.meta small{color:var(--muted)}
.tips{margin-top:8px}
.tips summary{cursor:pointer}
@media (max-width:560px){ .guide-list{grid-template-columns:1fr} }

/* Features */
.features{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:14px;padding:20px;margin:18px 0 20px;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.feature-item{background:#0f1013;border:1px solid var(--ring);border-radius:12px;padding:14px;text-align:center}
.feature-item::before{content:""}
.feature-item h3{margin:6px 0 4px}
.feature-item p{color:var(--muted)}