:root {
  --bg: #f8fafc; --card: #ffffff; --text: #0f172a; --text-muted: #64748b;
  --primary: #2563eb; --primary-hover: #1d4ed8; --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --radius: 12px; --font: system-ui, -apple-system, sans-serif;
  --slow: #f59e0b; --error: #ef4444; --success: #10b981;
}
[data-theme="dark"] {
  --bg: #0f172a; --card: #1e293b; --text: #f1f5f9; --text-muted: #94a3b8;
  --primary: #60a5fa; --primary-hover: #3b82f6; --border: #334155;
  --shadow: 0 2px 8px rgba(0,0,0,0.3);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font-family: var(--font); line-height: 1.5; transition: background 0.3s, color 0.3s; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

.header { background: var(--card); padding: 16px 0; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.header-content { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.header h1 { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; }
.subtitle { color: var(--text-muted); margin-top: 4px; font-size: 0.9rem; }
.header-actions { display: flex; gap: 10px; }
.icon-btn { background: transparent; border: 1px solid var(--border); border-radius: 8px; width: 36px; height: 36px; cursor: pointer; color: var(--text); display: flex; align-items: center; justify-content: center; transition: all 0.2s; }
.icon-btn:hover { background: var(--border); }

.controls { display: flex; flex-direction: column; gap: 12px; margin-bottom: 16px; }
.search-input { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--card); color: var(--text); font-size: 0.9rem; transition: all 0.2s; }
.search-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.15); }
.controls-bottom { display: flex; gap: 10px; align-items: center; width: 100%; }
#addToggle { flex-shrink: 0; }

.category-tabs { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px; flex: 1; }
.cat-tab { padding: 6px 14px; background: var(--card); border: 1px solid var(--border); border-radius: 16px; cursor: pointer; font-size: 0.85rem; transition: all 0.2s; white-space: nowrap; display: flex; align-items: center; gap: 4px; }
.cat-tab:hover, .cat-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.cat-count { background: rgba(255,255,255,0.25); color: #fff; font-size: 0.7rem; padding: 1px 6px; border-radius: 8px; font-weight: 600; }

.btn { padding: 8px 16px; border: none; border-radius: 8px; font-weight: 500; cursor: pointer; transition: all 0.2s; font-size: 0.9rem; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn-secondary { background: transparent; color: var(--text-muted); border: 1px solid var(--border); }

.add-form { background: var(--card); padding: 16px; border-radius: var(--radius); box-shadow: var(--shadow); margin-bottom: 20px; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 12px; }
.form-group label { display: block; margin-bottom: 4px; font-size: 0.8rem; color: var(--text-muted); }
.form-group input, .form-group select { width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; font-size: 0.9rem; background: var(--bg); color: var(--text); }
.form-actions { display: flex; gap: 8px; justify-content: flex-end; }

/* 📦 导入模块样式修复 */
.import-tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tab-btn { flex: 1; padding: 8px; border: 1px solid var(--border); background: var(--bg); color: var(--text-muted); border-radius: 8px; cursor: pointer; font-size: 0.9rem; transition: all 0.2s; }
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.import-panel { display: flex; flex-direction: column; gap: 12px; }
.paste-input { width: 100%; min-height: 120px; padding: 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--text); font-family: ui-monospace, SFMono-Regular, monospace; font-size: 0.85rem; resize: vertical; margin-bottom: 12px; }
.paste-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.15); }
.file-input { width: 100%; padding: 8px; border: 1px dashed var(--border); border-radius: 8px; background: var(--bg); color: var(--text-muted); font-size: 0.85rem; }
.file-input::file-selector-button { cursor: pointer; padding: 6px 12px; border: none; background: var(--border); color: var(--text); border-radius: 6px; margin-right: 10px; }

.word-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.word-card { background: var(--card); padding: 14px; border-radius: var(--radius); box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 6px; transition: transform 0.2s; }
.word-card:hover { transform: translateY(-2px); }
.word-header { display: flex; justify-content: space-between; align-items: flex-start; }
.word-chinese { font-size: 1.05rem; font-weight: 600; }
.word-meta { font-size: 0.75rem; color: var(--text-muted); background: var(--border); padding: 2px 6px; border-radius: 4px; }

.audio-controls { display: flex; gap: 6px; align-items: center; margin-top: 4px; }
.speak-btn { width: 32px; height: 32px; border-radius: 50%; border: 1px solid var(--border); background: transparent; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.2s; flex-shrink: 0; }
.speak-btn:hover { background: var(--border); }
.speak-btn.state-loading { animation: pulse 1s infinite; }
.speak-btn.state-playing { color: var(--primary); border-color: var(--primary); }
.speak-btn.state-error { color: var(--error); border-color: var(--error); }
.slow-toggle { width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--border); background: transparent; cursor: pointer; font-size: 0.7rem; font-weight: 600; color: var(--text-muted); transition: all 0.2s; flex-shrink: 0; }
.slow-toggle.active { background: var(--slow); color: #fff; border-color: var(--slow); }

.word-remark { font-size: 0.8rem; color: var(--text-muted); background: var(--bg); padding: 4px 8px; border-radius: 6px; border-left: 2px solid var(--primary); margin-top: 2px; word-break: break-word; }

.action-btns { display: flex; gap: 4px; margin-top: 6px; justify-content: flex-end; }
.action-btn { background: transparent; border: none; cursor: pointer; color: var(--text-muted); padding: 4px; border-radius: 4px; transition: all 0.2s; }
.action-btn:hover { background: var(--border); color: var(--text); }
.action-btn.delete:hover { color: var(--error); }

.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.4); display: flex; align-items: center; justify-content: center; z-index: 100; backdrop-filter: blur(4px); }
.modal { background: var(--card); padding: 20px; border-radius: var(--radius); width: 90%; max-width: 480px; box-shadow: var(--shadow); }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.modal-header h3 { font-size: 1.1rem; font-weight: 600; }
.modal-body { min-height: 120px; }
.hint { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 8px; }

.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: var(--text); color: var(--bg); padding: 10px 20px; border-radius: 8px; font-size: 0.9rem; z-index: 200; transition: opacity 0.3s; }
.hidden { display: none !important; }
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.6; transform: scale(0.95); } }

@media (max-width: 640px) { 
  .form-grid { grid-template-columns: 1fr; } 
  .word-grid { grid-template-columns: 1fr; } 
  .controls-bottom { gap: 8px; }
}