/* ========================================
   布局与容器
   ======================================== */

/* 主内容区 */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    min-height: 100vh;
    padding: 32px;
}

/* 页面标题 */
.page-header {
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    margin-bottom: 6px;
}

.page-header p {
    font-size: 14px;
    color: var(--text-muted);
}

/* 统计卡片 */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: all var(--transition-fast);
}

.stat-card:hover {
    box-shadow: var(--card-shadow-hover);
}

.stat-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.stat-card:nth-child(1) .stat-value { color: var(--accent-blue); }
.stat-card:nth-child(2) .stat-value { color: var(--accent-green); }
.stat-card:nth-child(3) .stat-value { color: var(--accent-amber); }

/* 栅格布局 */
.grid-layout {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.section-full {
    grid-column: 1 / -1;
}

/* 卡片 */
.grid-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all var(--transition-fast);
    animation: slideIn 0.3s ease forwards;
}

.grid-card:nth-child(1) { animation-delay: 0.05s; }
.grid-card:nth-child(2) { animation-delay: 0.1s; }
.grid-card:nth-child(3) { animation-delay: 0.15s; }
.grid-card:nth-child(4) { animation-delay: 0.2s; }

.grid-card:hover {
    box-shadow: var(--card-shadow-hover);
}

.grid-card h2 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: -0.01em;
}

.grid-card h2 svg {
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}

.card-upload {
    border-left: 3px solid var(--accent-blue);
}

.card-upload h2 svg { color: var(--accent-blue); }

.card-text {
    border-left: 3px solid var(--accent-green);
}

.card-text h2 svg { color: var(--accent-green); }

/* 主题切换按钮 */
.theme-toggle {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 200;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    box-shadow: var(--card-shadow);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    color: var(--text-secondary);
    transition: transform var(--transition-normal);
}

.theme-toggle:hover svg {
    color: var(--accent-blue);
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* 消息提示 */
.message {
    background: var(--accent-green-light);
    color: var(--accent-green);
    padding: 14px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid var(--accent-green);
}

.message svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}