/* PDF Page Extractor — Crimson Dark */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #EF4444;
  --primary-dim: rgba(239,68,68,0.12);
  --secondary: #F87171;
  --accent: #FCA5A5;
  --bg: #1A0D0D;
  --bg-card: #261414;
  --border: rgba(239,68,68,0.10);
  --text: #FEE2E2;
  --text-dim: #FCA5A5;
  --text-muted: #7F1D1D;
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Inter', system-ui, sans-serif;
  --transition: 0.2s ease;
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font); background: var(--bg); color: var(--text); min-height: 100vh; line-height: 1.6; }

.header { border-bottom: 1px solid var(--border); background: rgba(38,20,20,0.95); backdrop-filter: blur(12px); position: sticky; top: 0; z-index: 10; }
.header-inner { max-width: 800px; margin: 0 auto; padding: 12px 20px; display: flex; align-items: center; justify-content: space-between; }
.header-left { display: flex; align-items: center; gap: 10px; }
.header-actions { display: flex; gap: 6px; align-items: center; }
.logo-icon { font-size: 1.2rem; width: 38px; height: 38px; display: flex; align-items: center; justify-content: center; background: var(--primary-dim); border-radius: var(--radius-sm); }
.header h1 { font-size: 1.05rem; font-weight: 700; }
.subtitle { font-size: 0.72rem; color: var(--text-dim); }

.main { max-width: 800px; margin: 0 auto; padding: 20px; }

.btn { padding: 8px 16px; font-family: var(--font); font-size: 0.78rem; font-weight: 600; border: none; border-radius: 6px; cursor: pointer; transition: all var(--transition); }
.btn-sm { padding: 5px 10px; font-size: 0.72rem; background: var(--primary-dim); color: var(--primary); border: 1px solid rgba(239,68,68,0.2); }
.btn-primary { background: linear-gradient(135deg, var(--primary), #DC2626); color: #fff; }

.drop-zone { background: var(--bg-card); border: 2px dashed rgba(239,68,68,0.2); border-radius: var(--radius); padding: 40px; text-align: center; cursor: pointer; margin-bottom: 12px; transition: all var(--transition); }
.drop-zone:hover, .drop-zone.drag-over { border-color: var(--primary); background: rgba(239,68,68,0.05); }
.drop-label { font-size: 0.88rem; color: var(--text-dim); }

.info-bar { display: flex; justify-content: space-between; padding: 8px 14px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 12px; font-size: 0.72rem; color: var(--text-muted); }

.page-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
.page-thumb { position: relative; background: var(--bg-card); border: 2px solid transparent; border-radius: var(--radius-sm); overflow: hidden; cursor: pointer; transition: all var(--transition); aspect-ratio: 0.71; }
.page-thumb.selected { border-color: var(--primary); box-shadow: 0 0 12px rgba(239,68,68,0.2); }
.page-thumb canvas { width: 100%; height: 100%; object-fit: contain; display: block; }
.page-num { position: absolute; bottom: 4px; right: 4px; font-size: 0.58rem; font-weight: 700; color: #fff; background: rgba(0,0,0,0.6); padding: 1px 6px; border-radius: 4px; }
.page-check { position: absolute; top: 4px; left: 4px; width: 18px; height: 18px; border-radius: 4px; border: 2px solid rgba(255,255,255,0.3); background: rgba(0,0,0,0.3); display: flex; align-items: center; justify-content: center; font-size: 0.6rem; color: transparent; }
.page-thumb.selected .page-check { border-color: var(--primary); background: var(--primary); color: #fff; }

.toast-container { position: fixed; bottom: 20px; right: 20px; z-index: 200; }
.toast { padding: 10px 16px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); box-shadow: 0 4px 24px rgba(0,0,0,0.5); font-size: 0.82rem; animation: toastIn 0.3s ease; }
@keyframes toastIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }