/* 穿越万界 - UI界面方案 */
.traveler-ui {
    --bg-color: #0d0f1a;
    --primary-glow: #00f2fe;
    --secondary-glow: #ff00ff;
    --text-color: #e0e6f0;
    --text-muted: #8a99b5;
    --panel-bg: rgba(20, 24, 40, 0.75);
    --border-color: rgba(0, 242, 254, 0.3);
    font-family: 'Noto Sans SC', sans-serif;
    color: var(--text-color);
    padding: 15px;
    background: var(--bg-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    user-select: none;
}

.traveler-ui h1 {
    font-size: 1.8rem;
    text-align: center;
    background: linear-gradient(90deg, var(--primary-glow), var(--secondary-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 15px;
}

/* 标签切换系统 (CSS-ONLY) */
.traveler-ui .tabs-input { display: none; }
.traveler-ui .tab-list { display: flex; gap: 5px; margin-bottom: 15px; border-bottom: 1px solid var(--border-color); padding-bottom: 10px; }
.traveler-ui .tab-label { padding: 8px 15px; cursor: pointer; border: 1px solid var(--border-color); border-radius: 6px; font-size: 0.85rem; color: var(--text-muted); transition: 0.3s; }
.traveler-ui #tab1:checked ~ .tab-list label[for="tab1"],
.traveler-ui #tab2:checked ~ .tab-list label[for="tab2"],
.traveler-ui #tab3:checked ~ .tab-list label[for="tab3"] { background: var(--primary-glow); color: var(--bg-color); border-color: var(--primary-glow); }

.traveler-ui .tab-content { display: none; }
.traveler-ui #tab1:checked ~ .content-config,
.traveler-ui #tab2:checked ~ .content-world,
.traveler-ui #tab3:checked ~ .content-books { display: block; }

/* 表单与视觉装饰 */
.traveler-ui input, .traveler-ui textarea { width: 100%; background: rgba(0,0,0,0.3); border: 1px solid var(--border-color); padding: 8px; color: white; margin-top: 5px; margin-bottom: 10px; box-sizing: border-box;}
.traveler-ui .form-group label { display: block; color: var(--text-muted); font-size: 0.9rem; }
.traveler-ui .book-item { display: inline-block; padding: 4px 10px; background: rgba(0,0,0,0.2); border: 1px solid var(--border-color); border-radius: 15px; margin: 3px; font-size: 0.8rem; cursor: pointer; }
.traveler-ui .book-item:hover { background: var(--primary-glow); color: var(--bg-color); }