/* ========== 全局样式和变量 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    padding-bottom: env(safe-area-inset-bottom, 0);
}

/* ========== 顶部导航栏 ========== */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
    color: white;
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: var(--transition);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.header-title {
    font-size: 1.25rem;
    font-weight: 700;
    animation: fadeInDown 0.6s ease-out;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-icon {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    padding: 2px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
    flex-shrink: 0;
}

.header-title-text {
    font-size: inherit;
}

.header-icon:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.header-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.header-stats {
    font-size: 0.875rem;
    opacity: 0.9;
    margin-top: 0.5rem;
}

/* ========== 标签页导航 ========== */
.tabs {
    background-color: var(--card-bg);
    border-bottom: 2px solid var(--border-color);
    padding: 0 2rem;
    position: sticky;
    top: 80px;
    z-index: 99;
    transition: var(--transition);
}

.tabs-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    gap: 0;
}

.tab {
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

.tab:hover {
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05);
}

.tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    font-weight: 600;
}

/* ========== 主内容区 ========== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    animation: fadeIn 0.5s ease-out;
}

.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease-out;
}

.tab-panel.active {
    display: block;
}

/* ========== 卡片样式 ========== */
.card {
    background-color: var(--card-bg);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md, 0 4px 6px rgba(0,0,0,0.08));
}

@media (hover: hover) and (pointer: fine) {
    .card:hover {
        transform: translateY(-1px);
    }
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* ========== 动画 ========== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ========== 底部导航（手机端） ========== */
.bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.08);
    z-index: 200;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.15rem;
    padding: 0.5rem 0.25rem;
    min-height: 56px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.7rem;
    transition: var(--transition);
    -webkit-tap-highlight-color: transparent;
}

.bottom-nav-item.active {
    color: var(--primary-color);
}

.bottom-nav-icon {
    font-size: 1.25rem;
    line-height: 1;
}

.bottom-nav-label {
    font-weight: 500;
}