/* ===== base.css ===== */
/* 全局变量、重置、布局容器、通用组件 —— 不包含任何模块特有样式 */

:root {
    /* 颜色变量 */
    --color-bg: #FFFFFF;
    --color-text: #333333;
    --color-card-bg: #F8F9FA;
    --color-border: #E9ECEF;
    --color-primary: #1a56db;
    --color-secondary: #1e40af;
    --color-accent: #FF8C00;
    --color-muted: #6C757D;
    --color-header-bg: white;
    --color-footer-bg: #0F172A;
    --color-footer-text: #E9ECEF;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-overlay: rgba(0, 0, 0, 0.5);
    --color-sidebar-icon: #4b5563;
    --color-sidebar-icon-active: #1a56db;
    --color-video-overlay: rgba(0, 0, 0, 0.6);
    
    /* 布局变量 */
    --layout-topbar-height: 38px;
    --layout-header-height: 60px;
    --layout-footer-height: 62px;
    --layout-sidebar-width: 180px;
    --layout-sidebar-collapsed: 50px;
    --layout-mobile-sidebar: 220px;
    --layout-banner-height: 500px;
    --layout-mobile-banner: 350px;
    --layout-nav-min: 400px;
    --layout-nav-max: 800px;
    --layout-nav-right-min: 300px;
    --mobile-header-height: 58px;
    --mobile-search-height: 32px;
    
    /* 动画变量 */
    --animation-speed-fast: 0.2s;
    --animation-speed-normal: 0.3s;
    --animation-speed-slow: 0.5s;
    --animation-easing: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 字体变量 */
    --font-family-base: "Inter", -apple-system, BlinkMacSystemFont,
                        "Segoe UI", Roboto, Arial, "Noto Sans SC",
                        "PingFang SC", "Microsoft YaHei", sans-serif;
    
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-md: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --font-size-2xl: 22px;
    --font-size-3xl: 26px;
    --font-size-4xl: 34px;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;
    --spacing-3xl: 30px;
    --spacing-4xl: 40px;
    
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-full: 50%;
    
    --shadow-sm: 0 2px 6px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.5);
    
    --z-index-dropdown: 1000;
    --z-index-header: 1100;
    --z-index-overlay: 1200;
    --z-index-modal: 9999;
    --z-index-tooltip: 10000;
}

[data-theme="dark"] {
    --color-bg: #0F172A;
    --color-text: #E2E8F0;
    --color-card-bg: #1E293B;
    --color-border: #334155;
    --color-primary: #60A5FA;
    --color-secondary: #93C5FD;
    --color-accent: #FB923C;
    --color-muted: #94A3B8;
    --color-header-bg: #1E293B;
    --color-footer-bg: #0F172A;
    --color-footer-text: #CBD5E1;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-overlay: rgba(0, 0, 0, 0.7);
    --color-sidebar-icon: #9ca3af;
    --color-sidebar-icon-active: #60A5FA;
    --color-video-overlay: rgba(0, 0, 0, 0.7);
}

/* ===== 统一 Dropdown 行为层 ===== */
.dropdown-panel {
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity 0.25s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: none;
}
.dropdown-open > .dropdown-panel,
.dropdown-open .dropdown-panel {
    display: block;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
.dropdown-arrow {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.dropdown-open .dropdown-arrow {
    transform: rotate(180deg);
}

/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
html, body {
    overflow-x: hidden;
    max-width: 100%;
    width: 100%;
}
html {
    overflow-y: scroll;
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) var(--color-card-bg);
    scrollbar-gutter: stable;
}
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--color-card-bg);
}
::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: var(--radius-sm);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-secondary);
}

body {
    font-family: var(--font-family-base);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-weight: var(--font-weight-normal);
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--animation-speed-normal) ease,
                color var(--animation-speed-normal) ease;
    width: 100%;
    padding-top: var(--layout-header-height);
}
body.has-topbar {
    padding-top: calc(var(--layout-topbar-height) + var(--layout-header-height));
}
.no-scroll {
    position: fixed;
    left: 0;
    right: 0;
    overflow: hidden !important;
}
a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--animation-speed-normal) ease;
}
h1, h2, h3 {
    font-weight: var(--font-weight-semibold);
    letter-spacing: -0.01em;
}
button, input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ===== 工具类 ===== */
.mobile-hide {
    display: none !important;
}
@media (min-width: 769px) {
    .mobile-hide {
        display: block !important;
    }
}
.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== 布局容器（主内容区整体框架）===== */
.main-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}
.main-content-wrapper {
    flex: 1 0 auto;
    display: flex;
    flex-direction: column;
    width: 100%;
    margin-left: 180px;
    transition: margin-left 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    width: calc(100% - 180px);
    min-height: 100vh;
    overflow-x: hidden;
}
.content-layout {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    width: 100%;
}
.main-content {
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
}

/* ===== 通用卡片样式 ===== */
.card {
    background: var(--color-card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    box-shadow: 0 2px 6px rgba(0,0,0,.06);
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 28px rgba(0,0,0,.12);
    border-color: rgba(26, 86, 219, 0.3);
}

/* ===== 内容模块通用头部 ===== */
.module-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: 0 var(--spacing-md);
}
.module-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    position: relative;
    padding-left: var(--spacing-sm);
    color: var(--color-primary);
}
.module-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-primary);
    border-radius: 2px;
}
.module-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-muted);
    margin-bottom: var(--spacing-3xl);
    max-width: 800px;
}
.module-view-all {
    font-size: var(--font-size-md);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    transition: color var(--animation-speed-fast);
    display: flex;
    align-items: center;
    gap: 5px;
    white-space: nowrap;
}
.module-view-all:hover {
    color: var(--color-secondary);
    gap: var(--spacing-sm);
}

/* ===== 滚动容器与横向滑动交互（通用）===== */
.scroll-container {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl) 0;
    width: 100%;
}
.js-horizontal-slider {
    overflow: hidden;
    cursor: grab;
    user-select: none;
    -webkit-user-select: none;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
}
.js-horizontal-slider:active {
    cursor: grabbing;
}
.js-slider-track {
    display: flex;
    will-change: transform;
    transform: translate3d(0, 0, 0);
    transition: transform 0s;
}
.js-slider-track.is-animating {
    transition: transform 0.35s cubic-bezier(.22,.61,.36,1);
}
.js-slider-item {
    flex: 0 0 auto;
    user-select: none;
    -webkit-user-drag: none;
}

.scroll-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    background: var(--color-card-bg);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: background-color var(--animation-speed-normal), color var(--animation-speed-normal), transform var(--animation-speed-normal);
    z-index: 10;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    opacity: 0.8;
    display: none;
}
@media (min-width: 769px) {
    .scroll-nav {
        display: flex;
    }
}
.scroll-nav:hover {
    background: var(--color-primary);
    color: white;
    opacity: 1;
    transform: translateY(-50%) scale(1.05);
}
.scroll-nav.prev {
    left: var(--spacing-sm);
}
.scroll-nav.next {
    right: var(--spacing-sm);
}

.scroll-indicators {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}
@media (min-width: 769px) {
    .scroll-indicators {
        display: none;
    }
}
.scroll-indicator {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--color-border);
    cursor: pointer;
    transition: background-color var(--animation-speed-normal), transform var(--animation-speed-normal);
}
.scroll-indicator.active {
    background: var(--color-primary);
    transform: scale(1.2);
}

.scroll-nudge {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    background: var(--color-card-bg);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: background-color var(--animation-speed-normal), color var(--animation-speed-normal), transform var(--animation-speed-normal);
    z-index: 10;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    opacity: 0.8;
}
.scroll-nudge:hover {
    background: var(--color-primary);
    color: white;
    opacity: 1;
    transform: translateY(-50%) scale(1.05);
}
.scroll-nudge.left {
    left: var(--spacing-sm);
}
.scroll-nudge.right {
    right: var(--spacing-sm);
}

/* ===== 侧边栏折叠状态下的主内容区与页脚联动 ===== */
body.sidebar-collapsed .main-content-wrapper {
    margin-left: var(--layout-sidebar-collapsed);
    width: calc(100% - var(--layout-sidebar-collapsed));
}
body.sidebar-collapsed .footer {
    margin-left: var(--layout-sidebar-collapsed);
    width: calc(100% - var(--layout-sidebar-collapsed));
}

/* ===== 响应式布局（仅影响布局容器）===== */
@media (max-width: 768px) {
    :root {
        --layout-header-height: 33px;
    }
    body {
        font-size: 15px;
        line-height: 1.5;
        padding-top: var(--layout-header-height);
    }
    .sidebar {
        top: var(--layout-header-height);
    }
    .main-content {
        padding-top: var(--spacing-md);
    }
    .main-content-wrapper {
        margin-left: 0 !important;
        width: 100% !important;
    }
}
@media (min-width: 769px) {
    .main-content-wrapper {
        transition: margin-left 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                   width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    .sidebar {
        transition: width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    .main-content {
        transition: none;
    }
}