/* Study Vibe – Image→PDF Premium UI */
:root{
  --bg:#F9FAFB;
  --text:#111827;
  --primary:#2563EB;
  --accent:#10B981;
  --muted:#E5E7EB;
  --ring:rgba(37,99,235,.25);
  --card:#ffffff;
  --shadow:0 10px 30px rgba(0,0,0,.06);
  --radius:18px;
}

#img2pdf-app{font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,'Helvetica Neue',Arial,'Noto Sans',sans-serif;color:var(--text);background:var(--bg);padding:24px;max-width:980px;margin:0 auto}
.svb-header{margin-bottom:16px}
.svb-title{margin:0 0 6px;font-size:clamp(22px,3.2vw,30px);font-weight:800;letter-spacing:-.01em}
.svb-sub{margin:0;color:#4b5563}

.svb-dropzone{background:#f3f4f6;border:2px dashed #d1d5db;border-radius:var(--radius);padding:28px;transition:.2s;border-spacing:0}
.svb-dropzone:focus,.svb-dropzone:focus-visible{outline:3px solid var(--ring);outline-offset:4px}
.svb-dropzone.drag{background:#eef2ff;border-color:var(--primary)}
.svb-drop-inner{display:flex;gap:18px;align-items:center;justify-content:center;min-height:140px}
.svb-drop-icon{font-size:36px}

.svb-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:12px;padding:12px 16px;border:1px solid transparent;cursor:pointer;font-weight:700;transition:transform .05s ease,background .2s}
.svb-btn:active{transform:translateY(1px)}
.svb-btn-primary{background:var(--primary);color:#fff;box-shadow:var(--shadow)}
.svb-btn-success{background:var(--accent);color:#053b2d;box-shadow:var(--shadow)}
.svb-btn-ghost{background:#fff;border-color:#e5e7eb;color:#111827}
.svb-btn:disabled{opacity:.5;pointer-events:none}

.svb-hint{margin:.5rem 0 0;color:#6b7280;text-align:center}

.svb-queue{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px;margin:18px 0}
.svb-card{background:var(--card);border:1px solid #e5e7eb;border-radius:16px;box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column}
.svb-thumb{aspect-ratio:1/1;display:block;width:100%;object-fit:cover;background:#f3f4f6}
.svb-card-foot{display:flex;align-items:center;justify-content:space-between;padding:8px}
.svb-name{flex:1;min-width:0;margin-right:8px;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:#374151}
.svb-controls{display:flex;gap:6px}
.svb-iconbtn{border:1px solid #e5e7eb;background:#fff;border-radius:10px;padding:6px;cursor:pointer}
.svb-handle{cursor:grab}
.svb-iconbtn:active{transform:translateY(1px)}
.svb-remove{color:#ef4444;border-color:#fecaca}

.svb-toolbar{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;background:#fff;border:1px solid #e5e7eb;border-radius:16px;padding:12px;box-shadow:var(--shadow)}
.svb-group{display:flex;flex-direction:column;gap:6px}
.svb-label{font-weight:700;font-size:13px}
.svb-select{padding:10px;border-radius:10px;border:1px solid #e5e7eb;background:#fff}
.svb-range-val{font-size:12px;color:#6b7280}

.svb-toggles{flex-direction:row;align-items:center;gap:14px;flex-wrap:wrap}
.svb-toggle{display:flex;align-items:center;gap:8px;font-size:14px}
.svb-toggle input{accent-color:var(--primary)}

.svb-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:14px 0}
.svb-hidden{display:none !important}

.svb-progress{position:relative;height:12px;background:#eef2ff;border-radius:999px;overflow:hidden;box-shadow:inset 0 0 0 1px #c7d2fe}
.svb-progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--primary),#60a5fa);transition:width .25s ease}
.svb-progress-text{text-align:right;font-size:12px;color:#374151;margin-top:6px}

.svb-details{margin-top:12px}
.svb-details summary{cursor:pointer;font-weight:700}

/* Mobile niceties */
@media (max-width:600px){
  .svb-drop-inner{min-height:120px}
  .svb-queue{grid-template-columns:repeat(2,1fr)}
}