#app *, #app *::before, #app *::after { box-sizing: border-box; margin: 0; padding: 0; }
#app {
  --bg: #fbfbfd;
  --surface: #ffffff;
  --surface2: #f5f6f8;
  --border: #e5e5e7;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --accent: #7c3aed;
  --text: #1d1d1f;
  --text-dim: #86868b;
  --danger: #ef4444;
  --success: #10b981;
  --radius: 12px;
}
#app {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}
#app .container { max-width: 960px; margin: 0 auto; padding: 40px 24px; }
#app .card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 24px;
}
#app .card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
#app .card-title .badge {
  background: var(--primary);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 20px;
  font-weight: 500;
}
#app .settings-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 600px) { #app .settings-grid { grid-template-columns: 1fr; } }
#app .field label { display: block; font-size: 0.85rem; color: var(--text-dim); margin-bottom: 6px; font-weight: 500; }
#app .field input[type="text"], #app .field input[type="number"] {
  width: 100%; padding: 10px 14px; background: var(--surface2);
  border: 1px solid var(--border); border-radius: 8px; color: var(--text);
  font-size: 0.95rem; outline: none; transition: border-color 0.2s;
}
#app .field input:focus { border-color: var(--primary); }
#app .field .hint { font-size: 0.78rem; color: var(--text-dim); margin-top: 4px; }
#app .quality-row { display: flex; align-items: center; gap: 14px; }
#app .quality-row input[type="range"] { flex: 1; accent-color: var(--primary); height: 6px; }
#app .quality-row .quality-value { min-width: 42px; text-align: center; font-weight: 600; font-size: 0.95rem; color: var(--accent); }
#app .seg { display: inline-flex; background: var(--surface2); border-radius: 10px; padding: 4px; gap: 4px; }
#app .seg button {
  border: none; background: transparent; color: var(--text-dim); font-size: 0.9rem;
  padding: 8px 18px; border-radius: 8px; cursor: pointer; transition: all 0.2s; font-family: inherit;
}
#app .seg button.active { background: #fff; color: var(--primary); font-weight: 600; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }

#app .dropzone {
  border: 2px dashed var(--border); border-radius: var(--radius); padding: 48px 24px;
  text-align: center; cursor: pointer; transition: all 0.25s; position: relative;
}
#app .dropzone:hover, #app .dropzone.dragover { border-color: var(--primary); background: rgba(37, 99, 235, 0.06); }
#app .dropzone-icon { font-size: 2.5rem; margin-bottom: 12px; opacity: 0.5; }
#app .dropzone-text { color: var(--text-dim); font-size: 0.95rem; }
#app .dropzone-text strong { color: var(--primary); }
#app .dropzone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
#app .file-list-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
#app .file-count { font-size: 0.85rem; color: var(--text-dim); }
#app .btn-clear {
  background: none; border: 1px solid var(--border); color: var(--danger);
  padding: 5px 14px; border-radius: 6px; font-size: 0.8rem; cursor: pointer; transition: all 0.2s;
}
#app .btn-clear:hover { border-color: var(--danger); background: rgba(239, 68, 68, 0.08); }
#app .file-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
#app .file-item { background: var(--surface2); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; display: flex; flex-direction: column; }
#app .file-item .preview { width: 100%; aspect-ratio: 16/10; object-fit: cover; display: block; background: #f0f0f2; }
#app .file-item .info { padding: 10px 12px; flex: 1; }
#app .file-item .old-name { font-size: 0.78rem; color: var(--text-dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#app .file-item .sizes { font-size: 0.74rem; color: var(--accent); margin-top: 2px; font-weight: 500; }
#app .file-item .dl-btn {
  display: block; width: 100%; background: var(--primary); color: #fff; border: none;
  font-size: 0.8rem; padding: 8px; cursor: pointer; transition: background 0.2s;
}
#app .file-item .dl-btn:hover { background: var(--primary-hover); }

#app .actions { display: flex; gap: 12px; flex-wrap: wrap; }
#app .btn {
  padding: 12px 28px; border: none; border-radius: 8px; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; transition: all 0.25s; display: inline-flex; align-items: center; gap: 8px;
}
#app .btn-primary { background: linear-gradient(135deg, var(--primary), #7c3aed); color: #fff; flex: 1; justify-content: center; }
#app .btn-primary:hover:not(:disabled) { background: linear-gradient(135deg, var(--primary-hover), #2563eb); transform: translateY(-1px); box-shadow: 0 4px 20px rgba(37, 99, 235, 0.3); }
#app .btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }
#app .progress-wrap { margin-top: 20px; display: none; }
#app .progress-wrap.active { display: block; }
#app .progress-bar-bg { width: 100%; height: 8px; background: var(--surface2); border-radius: 4px; overflow: hidden; }
#app .progress-bar { height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 4px; transition: width 0.3s; width: 0%; }
#app .progress-text { font-size: 0.82rem; color: var(--text-dim); margin-top: 8px; text-align: center; }

#app .result-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
#app .toast {
  position: fixed; bottom: 32px; left: 50%; transform: translateX(-50%) translateY(100px);
  background: var(--success); color: #fff; padding: 12px 24px; border-radius: 8px;
  font-weight: 600; font-size: 0.9rem; opacity: 0; transition: all 0.4s; z-index: 999;
}
#app .toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
#app .toast.err { background: var(--danger); }

/* 与站点浅色风格对齐 */
#app .container { padding: 8px 4px 0; }
#app svg { vertical-align: -0.15em; }
#app .card-title .card-ico { color: var(--primary); display: inline-flex; }
#app .dropzone-icon { color: var(--primary); line-height: 1; opacity: 1; }
#app .dropzone-icon svg { width: 52px; height: 52px; }
#app .btn-primary svg { margin-right: 2px; }
#app .btn-clear svg { margin-right: 3px; vertical-align: -2px; }