/**
 * ChatGalaxy 主题控件样式
 * 主题选择器和透明度滑块
 * @version 1.0.0
 * @updated 2026-01-07
 * @author 深山有密林团队
 */

/* ========== 主题选择器 ========== */

.theme-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 16px;
}

.theme-option {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px 12px;
    background: var(--card-bg);
    border: 2px solid var(--sidebar-border);
    border-radius: 12px;
    cursor: pointer;
    transition: all var(--transition-base);
    overflow: hidden;
}

.theme-option:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.theme-option.active {
    border-color: var(--primary-color);
    background: var(--card-hover-bg);
    box-shadow: 0 0 0 3px var(--accent-color);
}

.theme-preview {
    width: 100%;
    height: 40px;
    border-radius: 8px;
    margin-bottom: 8px;
    position: relative;
    z-index: var(--z-content);
}

.theme-preview::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0) 50%, rgba(0,0,0,0.1) 100%);
    border-radius: 8px;
    z-index: var(--z-content);
}

.theme-info {
    text-align: center;
}

.theme-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 2px;
}

.theme-desc {
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.4;
}

/* 激活指示器 */
.theme-option.active::before {
    content: '✓';
    position: absolute;
    top: 8px;
    right: 8px;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
    box-shadow: var(--shadow-sm);
    z-index: var(--z-dropdown); /* 确保在 theme-preview 之上 */
}

/* ========== 透明度滑块 ========== */

.transparency-wrapper {
    padding: 16px;
}

.transparency-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--sidebar-text);
    margin-bottom: 12px;
}

.transparency-label i {
    font-size: 18px;
    color: var(--primary-color);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
    z-index: var(--z-dropdown);
}

.transparency-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--card-hover-bg);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    position: relative;
    z-index: var(--z-content);
}

/* 滑块轨道 */
.transparency-slider::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    background: linear-gradient(to right,
        var(--card-border) 0%,
        var(--primary-color) 100%
    );
    border-radius: 3px;
}

.transparency-slider::-moz-range-track {
    width: 100%;
    height: 6px;
    background: linear-gradient(to right,
        var(--card-border) 0%,
        var(--primary-color) 100%
    );
    border-radius: 3px;
}

/* 滑块滑块头 */
.transparency-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast);
    margin-top: -6px; /* 垂直居中：轨道高度6px，滑块头18px，(18-6)/2 = 6 */
    position: relative;
    z-index: var(--z-above-content);
}

.transparency-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast);
}

.transparency-slider:hover::-webkit-slider-thumb {
    transform: scale(1.2);
}

.transparency-slider:hover::-moz-range-thumb {
    transform: scale(1.2);
}

.transparency-slider:active::-webkit-slider-thumb {
    transform: scale(1.1);
}

.transparency-slider:active::-moz-range-thumb {
    transform: scale(1.1);
}

/* 透明度值显示 */
.transparency-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
    min-width: 45px;
    text-align: right;
    padding: 4px 8px;
    background: var(--card-hover-bg);
    border-radius: 6px;
}

/* ========== 组合布局 ========== */

/* 主题和透明度组合 */
.theme-controls-group {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.theme-controls-section {
    background: var(--card-bg);
    border: 1px solid var(--sidebar-border);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
    padding-left: 4px;
}

/* ========== 预设透明度按钮 ========== */

.transparency-presets {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.transparency-preset-btn {
    flex: 1;
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--card-bg);
    border: 1px solid var(--sidebar-border);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.transparency-preset-btn:hover {
    background: var(--card-hover-bg);
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.transparency-preset-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* ========== 响应式设计 ========== */

/* 平板设备 (≤768px) */
@media (max-width: 768px) {
    .theme-selector {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .theme-option {
        flex-direction: row;
        padding: 12px 16px;
        gap: 12px;
    }

    .theme-preview {
        width: 40px;
        height: 40px;
        margin-bottom: 0;
    }

    .theme-info {
        text-align: left;
        flex: 1;
    }

    .transparency-wrapper {
        padding: 12px;
    }
}

/* 手机设备 (≤480px) */
@media (max-width: 480px) {
    .theme-option {
        padding: 10px 12px;
    }

    .theme-name {
        font-size: 13px;
    }

    .theme-desc {
        font-size: 10px;
    }

    .transparency-value {
        font-size: 12px;
        min-width: 40px;
        padding: 4px 6px;
    }
}

/* ========== 触摸设备优化 ========== */

@media (hover: none) and (pointer: coarse) {
    .theme-option,
    .transparency-preset-btn {
        min-height: 44px;
    }

    .theme-option:active,
    .transparency-preset-btn:active {
        transform: scale(0.98);
        opacity: 0.9;
    }

    .transparency-slider {
        height: 8px;
    }

    .transparency-slider::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }

    .transparency-slider::-moz-range-thumb {
        width: 24px;
        height: 24px;
    }
}