/* 狗急加速系统自定义主题 - 公共样式 public.css (Proton 暗色风格 重构版) */

/* ==============================================
   1. CSS 自定义属性（与首页统一，合并完整变量体系）
   ============================================== */
:root {
    /* 背景色 */
    --proton-bg-dark: #1a1245;
    --proton-bg-darker: #110e2b;
    --proton-bg-card: rgba(255, 255, 255, 0.04);
    --proton-bg-card-hover: rgba(255, 255, 255, 0.07);
    --proton-bg-elevated: rgba(255, 255, 255, 0.06);
    
    /* 强调色 */
    --proton-purple: #6d4aff;
    --proton-purple-light: #8b70ff;
    --proton-purple-glow: rgba(109, 74, 255, 0.3);
    --proton-green: #4cc38a;
    --proton-green-hover: #3ba876;
    
    /* 文字色 */
    --text-white: #ffffff;
    --text-primary: #e8e6f0;
    --text-secondary: #a7a9bc;
    --text-muted: #7a7d95;
    
    /* 边框 */
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-medium: rgba(255, 255, 255, 0.12);
    --border-strong: rgba(255, 255, 255, 0.2);
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* 间距 */
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 40px;
    --space-3xl: 60px;
    --space-4xl: 80px;
    --space-5xl: 100px;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 滚动条 */
    --scrollbar-thumb: rgba(109, 74, 255, 0.4);
    --scrollbar-thumb-hover: rgba(109, 74, 255, 0.6);
    
    /* 容器 */
    --container-max: 1200px;
    --container-padding: 24px;
}

/* ==============================================
   2. 重置和基础样式
   ============================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--proton-bg-darker);
    font-size: 16px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ==============================================
   3. 自定义滚动条（变量化）
   ============================================== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--proton-bg-darker);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

* {
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--proton-bg-darker);
}

/* ==============================================
   4. 工具类
   ============================================== */
.text-white { color: var(--text-white); }
.text-muted { color: var(--text-muted); }

/* 卡片交互公共类（消除首页重复样式） */
.card-interactive {
    background: var(--proton-bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    transition: 
        border-color var(--transition-base),
        background var(--transition-base),
        transform var(--transition-base),
        box-shadow var(--transition-base);
}

.card-interactive:hover {
    border-color: var(--proton-purple);
    background: var(--proton-bg-card-hover);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px var(--proton-purple-glow);
}

/* 区块头部通用样式 */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-3xl);
}

.section-badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--proton-purple-light);
    background: rgba(109, 74, 255, 0.1);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-white);
    margin: 0 0 var(--space-md);
    letter-spacing: -0.02em;
}

.section-desc {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ==============================================
   5. 按钮系统（与首页统一）
   ============================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    padding: 14px 32px;
    cursor: pointer;
    transition: 
        background var(--transition-base),
        transform var(--transition-fast),
        box-shadow var(--transition-base);
    position: relative;
    overflow: hidden;
    line-height: 1.5;
}

.btn-primary,
.btn-secondary {
    background: var(--proton-purple);
    color: var(--text-white);
}

.btn-primary::before,
.btn-secondary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.btn-primary:hover,
.btn-secondary:hover {
    background: var(--proton-purple-light);
    box-shadow: 0 0 30px var(--proton-purple-glow);
    transform: translateY(-1px);
}

.btn-primary:hover::before,
.btn-secondary:hover::before {
    opacity: 1;
}

.btn-primary:active,
.btn-secondary:active {
    transform: translateY(0);
}

.btn-lg {
    padding: 18px 40px;
    font-size: 18px;
    border-radius: var(--radius-lg);
}

.btn-sm {
    padding: 10px 20px;
    font-size: 14px;
}

/* ==============================================
   6. 头部样式
   ============================================== */
.site-header {
    background-color: rgba(26, 18, 69, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color var(--transition-base);
}

/* 滚动后头部加深 */
.site-header.scrolled {
    background-color: rgba(26, 18, 69, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-logo .logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-white);
    transition: opacity var(--transition-fast);
}

.site-logo .logo-link:hover {
    opacity: 0.85;
}

.logo-img {
    height: 40px;
    width: auto;
    display: block;
}

/* ==============================================
   7. 导航栏多级菜单
   ============================================== */
.main-navigation {
    position: relative;
}

.main-navigation .nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    margin: 0;
    padding: 0;
}

.main-navigation .nav-menu li {
    position: relative;
}

.main-navigation .nav-menu li a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    transition: color var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 36px;
    line-height: 1;
    white-space: nowrap;
}

.main-navigation .nav-menu li a:hover {
    color: var(--text-white);
}

/* 当前菜单项高亮 */
.main-navigation .nav-menu .current-menu-item > a,
.main-navigation .nav-menu .current-menu-ancestor > a {
    color: var(--text-white);
}

/* 最后一项按钮化 */
.main-navigation .nav-menu > li:last-child > a {
    padding: 0 20px;
    border-radius: var(--radius-full);
    background: var(--proton-purple);
    border: none;
    color: var(--text-white);
    font-weight: 600;
    height: 38px;
    transition: 
        background var(--transition-base), 
        transform var(--transition-fast), 
        box-shadow var(--transition-base);
}

.main-navigation .nav-menu > li:last-child > a:hover {
    background: var(--proton-purple-light);
    color: var(--text-white);
    transform: translateY(-1px);
    box-shadow: 0 0 24px var(--proton-purple-glow);
}

/* 下拉二级菜单 */
.main-navigation .nav-menu .sub-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 200px;
    background-color: rgba(26, 18, 69, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    list-style: none;
    padding: 8px 0;
    margin: 0;
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: 
        transform var(--transition-base), 
        opacity var(--transition-base), 
        visibility var(--transition-base);
    z-index: 1010;
}

.main-navigation .nav-menu > li:last-child .sub-menu {
    left: auto;
    right: 0;
    transform: translateY(10px);
}

.main-navigation .nav-menu li:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.main-navigation .nav-menu > li:last-child:hover > .sub-menu {
    transform: translateY(0);
}

.main-navigation .nav-menu .sub-menu li {
    width: 100%;
}

.main-navigation .nav-menu .sub-menu li a {
    display: flex;
    width: 100%;
    height: auto;
    padding: 10px 20px;
    justify-content: flex-start;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.4;
    text-align: left;
    transition: 
        background var(--transition-fast), 
        color var(--transition-fast);
    border-radius: 0;
}

.main-navigation .nav-menu .sub-menu li a:hover {
    background-color: var(--proton-bg-elevated);
    color: var(--text-white);
}

/* 下拉箭头 */
.main-navigation .menu-item-has-children > a::after {
    content: '';
    display: inline-block;
    width: 5px;
    height: 5px;
    margin-left: 8px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    transition: transform var(--transition-fast);
    opacity: 0.7;
}

.main-navigation .sub-menu .menu-item-has-children > a::after {
    transform: rotate(-45deg);
    margin-left: auto;
}

/* 三级菜单 */
.main-navigation .nav-menu .sub-menu .sub-menu {
    position: absolute;
    top: -8px;
    left: 100%;
    transform: translateX(10px);
}

.main-navigation .nav-menu .sub-menu li:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

/* 导航遮罩层 */
.nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity var(--transition-base);
}

/* ==============================================
   8. 汉堡菜单按钮（移动端）
   ============================================== */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.nav-toggle:hover {
    background: var(--proton-bg-elevated);
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-white);
    border-radius: 2px;
    transition: 
        transform var(--transition-base),
        opacity var(--transition-base);
    transform-origin: center;
}

.nav-toggle span:nth-child(2) {
    margin: 5px 0;
}

/* 激活状态 - 变为 X */
.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ==============================================
   9. 页脚样式
   ============================================== */
.site-footer {
    background-color: #0d0a20;
    color: var(--text-secondary);
    padding: 58px 0 30px;
    text-align: left;
    margin-top: auto;
    border-top: 1px solid var(--border-subtle);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0;
}

.footer-top {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 40px;
}

.footer-col {
    display: flex;
    flex-direction: column;
}

.footer-col-title {
    margin: 0 0 14px;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-white);
    letter-spacing: 0.5px;
}

.footer-link {
    display: block;
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-muted);
    text-decoration: none;
    line-height: 1.6;
    transition: 
        color var(--transition-fast), 
        transform var(--transition-fast);
    width: fit-content;
}

.footer-link:hover {
    color: var(--text-white);
    transform: translateX(2px);
}

/* 社交媒体图标 */
.footer-socials {
    margin-top: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-social {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: 
        opacity var(--transition-fast),
        transform var(--transition-fast);
}

.footer-social:hover {
    opacity: 0.85;
    transform: translateY(-2px);
}

.footer-social svg {
    width: 14px;
    height: 14px;
    display: block;
    fill: #fff;
}

.footer-social-x { background: #1d9bf0; }
.footer-social-facebook { background: #1877f2; }
.footer-social-instagram { background: radial-gradient(circle at 30% 107%, #fdf497 0%, #fdf497 5%, #fd5949 45%, #d6249f 60%, #285aeb 90%); }

/* 页脚底部 */
.footer-bottom {
    margin-top: 35px;
    padding-top: 18px;
    border-top: 1px solid var(--border-subtle);
    text-align: center;
}

.copyright {
    margin: 0;
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-muted);
}

.footer-region {
    margin: 4px 0 0;
    font-size: 11px;
    line-height: 1.5;
    color: var(--text-muted);
}

/* ==============================================
   10. 无障碍
   ============================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

@media screen and (forced-colors: active) {
    .btn-primary,
    .btn-secondary {
        border: 2px solid ButtonText;
    }
}

/* ==============================================
   11. 响应式
   ============================================== */

/* 平板及以下 (≤1024px) */
@media (max-width: 64em) {
    .container {
        padding: 0 24px;
    }
    
    .main-navigation .nav-menu {
        gap: 20px;
    }
    
    .main-navigation .nav-menu li a {
        font-size: 14px;
    }
}

/* 手机 (≤768px) */
@media (max-width: 48em) {
    .container {
        padding: 0 20px;
    }

    /* 显示汉堡菜单 */
    .nav-toggle {
        display: flex;
    }

    /* 移动端导航 */
    .main-navigation {
        position: fixed;
        top: 0;
        right: -320px;
        width: 300px;
        height: 100vh;
        height: 100dvh;
        background: rgba(26, 18, 69, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-left: 1px solid var(--border-medium);
        padding: 80px 24px 24px;
        overflow-y: auto;
        z-index: 1000;
        transition: right var(--transition-smooth);
        box-shadow: -10px 0 40px rgba(0, 0, 0, 0.5);
    }

    .main-navigation.active {
        right: 0;
    }

    /* 显示遮罩 */
    .nav-overlay.active {
        display: block;
        opacity: 1;
    }

    /* 移动端菜单垂直排列 */
    .main-navigation .nav-menu {
        flex-direction: column;
        gap: 4px;
    }

    .main-navigation .nav-menu li a {
        width: 100%;
        justify-content: flex-start;
        padding: 12px 16px;
        height: auto;
        font-size: 16px;
        border-radius: var(--radius-sm);
        transition: background var(--transition-fast), color var(--transition-fast);
    }

    .main-navigation .nav-menu li a:hover {
        background: var(--proton-bg-elevated);
    }

    /* 移动端按钮项 */
    .main-navigation .nav-menu > li:last-child > a {
        border-radius: var(--radius-sm);
        height: auto;
        padding: 12px 16px;
        text-align: center;
        justify-content: center;
        margin-top: 8px;
    }

    /* 移动端子菜单 - 改为手风琴展开 */
    .main-navigation .nav-menu .sub-menu {
        position: static;
        transform: none;
        width: 100%;
        min-width: unset;
        background: transparent;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        border: none;
        box-shadow: none;
        padding: 0 0 0 16px;
        opacity: 1;
        visibility: visible;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-smooth);
        border-radius: 0;
    }

    .main-navigation .nav-menu li.menu-open > .sub-menu {
        max-height: 500px;
    }

    .main-navigation .nav-menu .sub-menu li a {
        padding: 10px 16px;
        font-size: 15px;
    }

    /* 移动端三级菜单 */
    .main-navigation .nav-menu .sub-menu .sub-menu {
        position: static;
        transform: none;
        padding-left: 16px;
        max-height: 0;
        overflow: hidden;
    }

    .main-navigation .nav-menu .sub-menu li.menu-open > .sub-menu {
        max-height: 500px;
    }

    /* 移动端箭头旋转 */
    .main-navigation .menu-item-has-children > a {
        justify-content: space-between;
    }

    .main-navigation .menu-item-has-children.menu-open > a::after {
        transform: rotate(-135deg);
    }

    .main-navigation .sub-menu .menu-item-has-children > a::after {
        transform: rotate(45deg);
    }

    .main-navigation .sub-menu .menu-item-has-children.menu-open > a::after {
        transform: rotate(-135deg);
    }

    /* 头部 */
    .site-header {
        padding: 12px 0;
    }

    .logo-img {
        height: 32px;
    }

    /* 页脚 */
    .site-footer {
        padding: 46px 0 24px;
    }

    .footer-top {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 28px;
    }

    .footer-col:last-child {
        grid-column: 1 / -1;
    }
}

/* 小手机 (≤480px) */
@media (max-width: 30em) {
    .section-title {
        font-size: 28px;
    }

    .btn {
        width: 100%;
    }

    .site-footer {
        padding: 40px 0 22px;
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .footer-col:last-child {
        grid-column: auto;
    }

    .footer-col-title {
        font-size: 14px;
        margin-bottom: 8px;
    }

    .footer-link {
        font-size: 12px;
        margin-top: 6px;
    }
}