.tool-container { max-width: 560px; margin: 0 auto; padding: 20px 16px 60px; }
.tool-header { text-align: center; padding: 40px 0 24px; }
.tool-icon { font-size: 3rem; margin-bottom: 12px; }
.tool-header h1 { font-size: 1.8rem; margin-bottom: 8px; }
.subtitle { color: var(--accent-color); font-size: 0.95rem; }
.primary-btn { display: block; width: 100%; padding: 14px; background: var(--primary-color); color: #fff; border: none; border-radius: 12px; font-size: 1rem; font-weight: 600; cursor: pointer; margin-bottom: 12px; transition: opacity 0.2s; }
.primary-btn:hover { opacity: 0.85; }
.secondary-btn { display: block; width: 100%; padding: 12px; background: transparent; color: var(--text-color); border: 2px solid var(--input-border); border-radius: 12px; font-size: 0.95rem; cursor: pointer; }
.category-grid { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.cat-btn { padding: 8px 16px; background: var(--input-bg); border: 2px solid var(--input-border); border-radius: 20px; color: var(--text-color); cursor: pointer; font-size: 0.9rem; transition: all 0.2s; }
.cat-btn.active { border-color: var(--primary-color); color: var(--primary-color); font-weight: 600; }
.question-card { background: var(--card-bg); border-radius: 20px; padding: 36px 24px; text-align: center; margin-bottom: 20px; min-height: 160px; display: flex; flex-direction: column; justify-content: center; gap: 12px; transition: opacity 0.2s; }
.question-card.flip { opacity: 0; transform: scale(0.97); }
.q-category { font-size: 0.8rem; background: var(--primary-color); color: #fff; padding: 3px 12px; border-radius: 12px; display: inline-block; align-self: center; }
.q-main { font-size: 1.2rem; font-weight: 700; line-height: 1.7; word-break: keep-all; }
.history-section { margin-bottom: 16px; }
.history-title { font-size: 0.85rem; opacity: 0.6; margin-bottom: 10px; }
.history-list { display: flex; flex-direction: column; gap: 8px; }
.history-item { background: var(--card-bg); border-radius: 10px; padding: 10px 14px; display: flex; gap: 10px; align-items: flex-start; opacity: 0.7; }
.h-cat { font-size: 0.75rem; background: var(--input-border); padding: 2px 8px; border-radius: 8px; white-space: nowrap; margin-top: 2px; }
.h-q { font-size: 0.88rem; line-height: 1.5; word-break: keep-all; }
.recommend-section { margin: 8px 0 16px; }
.recommend-title { text-align: center; font-size: 0.9rem; opacity: 0.7; margin-bottom: 12px; }
.recommend-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.recommend-btn { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 12px 4px; background: var(--card-bg); border-radius: 10px; text-decoration: none; color: var(--text-color); font-size: 0.8rem; transition: background 0.2s; }
.recommend-btn:hover { background: var(--input-bg); }
.rec-icon { font-size: 1.4rem; }