:root {
    /* 浅色主题 (默认) */
    --bg-body: #f7f9fc;
    --bg-surface: #ffffff;
    --bg-surface-hover: #f8f9fa;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-text: #ffffff;
    --danger-color: #ef4444;
    --danger-bg: #fef2f2;
    --success-color: #10b981;
    --success-bg: #ecfdf5;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --radius-md: 12px;
    --radius-lg: 16px;
    --header-height: 64px;
    --nav-width: 260px; /* PC默认宽度 */
    --input-height: 44px;
}

[data-theme="dark"] {
    --bg-body: #0f1115;
    --bg-surface: #1a1d24;
    --bg-surface-hover: #242832;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border-color: #2e3542;
    --border-hover: #3f4859;
    --primary-color: #3b82f6;
    --primary-hover: #60a5fa;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
}

/* 移动端覆盖 */
@media (max-width: 768px) {
    :root {
        --nav-width: 0px;
    }
}

/* 基础重置 */
*, *::before, *::after { box-sizing: border-box; outline: none; -webkit-tap-highlight-color: transparent; }
html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    overflow-x: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background-color 0.3s, color 0.3s;
}

a { text-decoration: none; color: inherit; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }
input, select, textarea { font-family: inherit; }

/* 布局 - 全站唯一根结构 */
.app-layout {
    display: flex;
    min-height: 100vh;
    width: 100%;
    position: relative;
}

.sidebar {
    width: var(--nav-width);
    background: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    position: fixed;
    height: 100vh;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    z-index: 50;
    top: 0;
    left: 0;
    transition: width 0.3s ease;
    overflow-y: auto;
}

.main-content {
    flex: 1;
    margin-left: var(--nav-width); /* 关键：移动端会自动变为0 */
    padding: 24px;
    max-width: 100%;
    min-width: 0; /* 防止flex溢出 */
    width: 100%;
    transition: margin-left 0.3s ease;
}

.app-header {
    height: var(--header-height);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    position: sticky;
    top: 0;
    z-index: 40;
    width: 100%;
    display: none;
}

/* 移动端特定处理 */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%); /* 彻底移出视图 */
        width: 260px; /* 抽屉模式下的宽度 */
        box-shadow: var(--shadow-md);
        visibility: hidden; /* 防止点击穿透 */
    }
    .sidebar.active {
        transform: translateX(0);
        visibility: visible;
    }
    .main-content {
        padding: 16px;
        /* 底部导航 + 安全区 */
        padding-bottom: calc(60px + env(safe-area-inset-bottom) + 16px);
    }
    .app-header { display: flex; }
    
    .mobile-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: calc(60px + env(safe-area-inset-bottom));
        background: var(--bg-surface);
        border-top: 1px solid var(--border-color);
        display: flex;
        justify-content: space-around;
        align-items: flex-start;
        z-index: 100;
        padding-top: 8px;
        padding-bottom: env(safe-area-inset-bottom);
    }
    .mobile-nav-item {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        font-size: 10px;
        color: var(--text-tertiary);
        gap: 4px;
    }
    .mobile-nav-item.active { color: var(--primary-color); }
    .mobile-nav-item svg { width: 24px; height: 24px; }
    
    .table-responsive {
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

@media (min-width: 769px) {
    .mobile-nav { display: none; }
    .app-header { display: none; }
}

/* 组件 */
.logo {
    font-size: 20px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    margin-bottom: 32px;
    padding: 0 12px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.2s;
    margin-bottom: 4px;
}
.nav-item:hover { background: var(--bg-surface-hover); color: var(--text-primary); }
.nav-item.active { background: var(--bg-surface-hover); color: var(--primary-color); font-weight: 600; }
.nav-item svg { width: 20px; height: 20px; }

.card {
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
    width: 100%;
    /* 强制内容不撑破 */
    max-width: 100%;
    overflow-wrap: break-word;
}
@media (max-width: 768px) {
    .card { padding: 16px; }
}

.btn {
    height: 44px;
    padding: 0 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s;
    border: 1px solid transparent;
    white-space: nowrap;
    max-width: 100%;
}
.btn-sm { height: 32px; padding: 0 12px; font-size: 13px; }
.btn-primary { background: var(--primary-color); color: var(--primary-text); }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-secondary { background: var(--bg-surface); border-color: var(--border-color); color: var(--text-primary); }
.btn-secondary:hover:not(:disabled) { background: var(--bg-surface-hover); border-color: var(--border-hover); }
.btn-ghost { color: var(--text-secondary); }
.btn-ghost:hover { background: var(--bg-surface-hover); color: var(--text-primary); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }
.btn.loading svg { animation: spin 1s linear infinite; }

.input-group { margin-bottom: 20px; width: 100%; }
.input-label { display: block; font-size: 14px; font-weight: 500; color: var(--text-secondary); margin-bottom: 8px; }
.input-field {
    width: 100%;
    height: var(--input-height);
    padding: 0 16px;
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.2s;
    max-width: 100%; /* 防止溢出 */
}
.input-field:focus {
    border-color: var(--primary-color);
    background: var(--bg-surface);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.empty-state {
    text-align: center;
    padding: 64px 24px;
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    border: 1px dashed var(--border-color);
    width: 100%;
}
.empty-icon {
    width: 64px; height: 64px; background: var(--bg-body); border-radius: 50%;
    display: flex; align-items: center; justify-content: center; margin: 0 auto 16px;
    color: var(--text-tertiary);
}
.empty-title { font-size: 18px; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; }
.empty-desc { color: var(--text-secondary); font-size: 14px; max-width: 400px; margin: 0 auto 24px; }

.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 1000; display: flex; flex-direction: column; gap: 8px; }
@media (max-width: 768px) {
    .toast-container { right: 16px; left: 16px; bottom: 80px; width: auto; }
    .toast { min-width: 0; width: 100%; }
}
.toast {
    background: var(--bg-surface); border: 1px solid var(--border-color);
    padding: 12px 16px; border-radius: var(--radius-md); box-shadow: var(--shadow-md);
    display: flex; align-items: center; gap: 12px; min-width: 300px;
    animation: slideIn 0.3s cubic-bezier(0.2, 0, 0.2, 1);
}
.toast-success { border-left: 4px solid var(--success-color); }
.toast-error { border-left: 4px solid var(--danger-color); }
.toast-icon { flex-shrink: 0; }
.toast-success .toast-icon { color: var(--success-color); }
.toast-error .toast-icon { color: var(--danger-color); }
.toast-content { flex: 1; font-size: 14px; color: var(--text-primary); }

@keyframes slideIn { from { transform: translateY(100%); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes spin { to { transform: rotate(360deg); } }

.hidden { display: none !important; }
/* 响应式 Flex 布局辅助 */
.flex-between { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    flex-wrap: wrap; 
    gap: 12px; 
    width: 100%;
}
.text-sm { font-size: 13px; }
.text-muted { color: var(--text-secondary); }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.gap-2 { gap: 8px; }

.skeleton { background: var(--bg-surface-hover); border-radius: 4px; animation: pulse 1.5s infinite; }
@keyframes pulse { 0% { opacity: 0.6; } 50% { opacity: 1; } 100% { opacity: 0.6; } }

.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
}
.badge-success { background: var(--success-bg); color: var(--success-color); }
.badge-danger { background: var(--danger-bg); color: var(--danger-color); }

/* Switch Toggle */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--border-color);
    transition: .4s;
}
.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    box-shadow: var(--shadow-sm);
}
input:checked + .slider { background-color: var(--primary-color); }
input:checked + .slider:before { transform: translateX(20px); }
input:disabled + .slider { opacity: 0.5; cursor: not-allowed; }
.slider.round { border-radius: 24px; }
.slider.round:before { border-radius: 50%; }