/* ========================================
   芭彼小镇建站 - 商务科技风 CSS
   布局：左侧垂直固定导航 + 右侧自由流动内容
   风格：深空蓝 + 银灰 + 浅蓝
   ======================================== */

/* CSS Reset & 基础变量 */
:root {
    --color-deep-space: #0a1628;
    --color-deep-space-light: #152238;
    --color-silver: #c0c5ce;
    --color-silver-light: #d9dde2;
    --color-light-blue: #4a9eff;
    --color-light-blue-hover: #3a8eef;
    --color-white: #ffffff;
    --color-bg: #f0f2f5;
    --color-card-bg: #ffffff;
    --color-text-primary: #1a2332;
    --color-text-secondary: #5a6575;
    --shadow-card: 0 4px 12px rgba(10, 22, 40, 0.08);
    --shadow-hover: 0 8px 24px rgba(10, 22, 40, 0.12);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --nav-width: 260px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 布局容器 */
.layout-container {
    display: flex;
    min-height: 100vh;
}

/* 左侧固定导航 */
.sidebar-nav {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--nav-width);
    height: 100vh;
    background: linear-gradient(180deg, var(--color-deep-space) 0%, var(--color-deep-space-light) 100%);
    color: var(--color-white);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.3);
    overflow-y: auto;
}

.sidebar-nav::-webkit-scrollbar {
    width: 6px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: var(--color-light-blue);
    border-radius: 3px;
}

.nav-header {
    padding: 40px 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 15px;
    text-decoration: none;
    color: var(--color-white);
}

.nav-logo img {
    width: 50px;
    height: 50px;
    object-fit: contain;
    border-radius: 8px;
    background: var(--color-white);
    padding: 5px;
}

.nav-logo span {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
    background: linear-gradient(135deg, var(--color-white) 0%, var(--color-light-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    list-style: none;
    padding: 30px 20px;
    flex: 1;
}

.nav-menu li {
    margin-bottom: 8px;
}

.nav-menu a {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 14px 20px;
    color: var(--color-silver);
    text-decoration: none;
    border-radius: 10px;
    transition: var(--transition);
    font-size: 15px;
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.nav-menu a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 100%;
    background: var(--color-light-blue);
    transform: scaleY(0);
    transition: var(--transition);
}

.nav-menu a:hover,
.nav-menu a.active {
    background: rgba(74, 158, 255, 0.15);
    color: var(--color-white);
    transform: translateX(5px);
}

.nav-menu a:hover::before,
.nav-menu a.active::before {
    transform: scaleY(1);
}

.nav-menu i {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

.nav-footer {
    padding: 30px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.nav-footer p {
    font-size: 13px;
    color: var(--color-silver);
    line-height: 1.8;
}

.nav-contact {
    margin-top: 15px;
    padding: 15px;
    background: rgba(74, 158, 255, 0.1);
    border-radius: 10px;
    border: 1px solid rgba(74, 158, 255, 0.3);
}

.nav-contact p {
    font-size: 14px;
    color: var(--color-light-blue);
    font-weight: 600;
}

/* 右侧主内容区 */
.main-content {
    margin-left: var(--nav-width);
    flex: 1;
    padding: 0;
    background: var(--color-bg);
}

/* 顶部横幅 */
.top-banner {
    background: linear-gradient(135deg, var(--color-deep-space) 0%, var(--color-deep-space-light) 50%, #1a2a4a 100%);
    padding: 80px 60px;
    position: relative;
    overflow: hidden;
}

.top-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(74, 158, 255, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.top-banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(74, 158, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.banner-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.banner-content h1 {
    font-size: 48px;
    font-weight: 800;
    color: var(--color-white);
    margin-bottom: 20px;
    line-height: 1.2;
    letter-spacing: -1px;
}

.banner-content h1 span {
    color: var(--color-light-blue);
}

.banner-content p {
    font-size: 18px;
    color: var(--color-silver);
    line-height: 1.8;
    max-width: 700px;
}

/* 内容区块 */
.content-section {
    padding: 60px;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--color-deep-space);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-light-blue), var(--color-silver));
    border-radius: 2px;
}

.section-header p {
    font-size: 16px;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-top: 20px;
}

/* 卡片样式 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}

.card {
    background: var(--color-card-bg);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: var(--transition);
    border: 1px solid rgba(10, 22, 40, 0.05);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.card-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
    position: relative;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.card:hover .card-image img {
    transform: scale(1.08);
}

.card-content {
    padding: 25px;
}

.card-content h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-deep-space);
    margin-bottom: 12px;
}

.card-content p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-light-blue);
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: var(--transition);
}

.card-link:hover {
    color: var(--color-light-blue-hover);
    gap: 12px;
}

/* 特性列表 */
.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 25px;
    background: var(--color-card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow-card);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-light-blue), var(--color-deep-space));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.feature-icon img {
    width: 32px;
    height: 32px;
    object-fit: contain;
    filter: brightness(0) invert(1);
}

.feature-content h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-deep-space);
    margin-bottom: 10px;
}

.feature-content p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* 资讯列表 */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.news-item {
    background: var(--color-card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.news-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.news-item:hover .news-image img {
    transform: scale(1.05);
}

.news-content {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.news-content h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-deep-space);
    margin-bottom: 10px;
    line-height: 1.4;
}

.news-content p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 15px;
    flex: 1;
}

.news-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    font-size: 13px;
    color: var(--color-text-secondary);
    padding-top: 15px;
    border-top: 1px solid rgba(10, 22, 40, 0.08);
}

.news-date {
    display: flex;
    align-items: center;
    gap: 6px;
}

.news-read {
    color: var(--color-light-blue);
    font-weight: 600;
}

/* 页脚 */
.page-footer {
    background: linear-gradient(180deg, var(--color-deep-space) 0%, var(--color-deep-space-light) 100%);
    color: var(--color-silver);
    padding: 60px 60px 30px;
    margin-top: 80px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 50px;
    margin-bottom: 50px;
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--color-light-blue);
    border-radius: 2px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section ul li a {
    color: var(--color-silver);
    text-decoration: none;
    transition: var(--transition);
    font-size: 15px;
}

.footer-section ul li a:hover {
    color: var(--color-light-blue);
    padding-left: 8px;
}

.footer-section p {
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 10px;
}

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 14px;
    color: var(--color-silver);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    :root {
        --nav-width: 240px;
    }
    
    .content-section {
        padding: 50px 40px;
    }
}

@media (max-width: 992px) {
    .sidebar-nav {
        transform: translateX(-100%);
        transition: var(--transition);
    }
    
    .sidebar-nav.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-toggle {
        display: flex;
        position: fixed;
        top: 20px;
        left: 20px;
        z-index: 1001;
        width: 50px;
        height: 50px;
        background: var(--color-deep-space);
        border-radius: 12px;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    }
    
    .mobile-toggle span {
        width: 24px;
        height: 2px;
        background: var(--color-white);
        position: relative;
        transition: var(--transition);
    }
    
    .mobile-toggle span::before,
    .mobile-toggle span::after {
        content: '';
        position: absolute;
        width: 24px;
        height: 2px;
        background: var(--color-white);
        transition: var(--transition);
    }
    
    .mobile-toggle span::before {
        top: -7px;
    }
    
    .mobile-toggle span::after {
        bottom: -7px;
    }
    
    .mobile-toggle.active span {
        background: transparent;
    }
    
    .mobile-toggle.active span::before {
        top: 0;
        transform: rotate(45deg);
    }
    
    .mobile-toggle.active span::after {
        bottom: 0;
        transform: rotate(-45deg);
    }
    
    .top-banner {
        padding: 60px 40px;
    }
    
    .banner-content h1 {
        font-size: 36px;
    }
    
    .content-section {
        padding: 40px 30px;
    }
}

@media (max-width: 768px) {
    .card-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
    }
    
    .top-banner {
        padding: 50px 30px;
    }
    
    .banner-content h1 {
        font-size: 28px;
    }
    
    .banner-content p {
        font-size: 16px;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .content-section {
        padding: 30px 20px;
    }
    
    .page-footer {
        padding: 40px 30px 20px;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }