/* ==================== 核心变量系统 ==================== */
:root {
    /* 主色调 - 开云金橙色系 */
    --primary-color: #f59e0b;
    --primary-hover: #d97706;
    --primary-light: #fcd34d;
    --primary-dark: #b45309;

    /* 辅助色 - 深蓝色系 */
    --secondary-color: #1e3a5f;
    --secondary-light: #2563eb;
    --secondary-dark: #0f172a;

    /* 中性色 */
    --accent-color: #ffffff;
    --text-color: #1e293b;
    --text-light: #64748b;
    --text-lighter: #94a3b8;
    --text-dark: #0f172a;

    /* 背景色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-light: #fef3c7;
    --bg-dark: #0f172a;

    /* 边框与阴影 */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-primary: 0 4px 20px rgba(245, 158, 11, 0.15);
    --shadow-hover: 0 8px 30px rgba(245, 158, 11, 0.25);

    /* 间距与尺寸 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* 字体 */
    --font-sans: 'Inter', 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', system-ui, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    /* 动画与过渡 */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== 基础重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-primary);
    overflow-x: hidden;
    text-rendering: optimizeLegibility;
}

/* ==================== 基础样式 ==================== */
a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-base);
}

a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ==================== 容器系统 ==================== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-fluid {
    width: 100%;
    padding: 0 20px;
}

.container-sm {
    max-width: 768px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-md {
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==================== 工具类 ==================== */
.section-padding {
    padding: var(--space-2xl) 0;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.flex {
    display: flex;
}

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

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

.hidden {
    display: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.bg-light {
    background-color: var(--bg-secondary);
}

/* ==================== 按钮组件 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: var(--font-size-base);
    line-height: 1;
    border: none;
    cursor: pointer;
    transition: var(--transition-base);
    gap: 8px;
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--accent-color);
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--accent-color);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 16px 40px;
    font-size: var(--font-size-lg);
}

.btn-sm {
    padding: 10px 24px;
    font-size: var(--font-size-sm);
}

/* ==================== 标题排版 ==================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 20px;
    color: var(--text-dark);
}

h1 {
    font-size: var(--font-size-5xl);
}

h2 {
    font-size: var(--font-size-4xl);
}

h3 {
    font-size: var(--font-size-3xl);
}

h4 {
    font-size: var(--font-size-2xl);
}

h5 {
    font-size: var(--font-size-xl);
}

h6 {
    font-size: var(--font-size-lg);
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title p {
    color: var(--text-light);
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto;
}

.section-subtitle {
    color: var(--primary-color);
    font-weight: 600;
    font-size: var(--font-size-base);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 15px;
    display: block;
}

/* ==================== 导航栏 ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 28px;
    font-weight: 800;
    color: var(--secondary-color);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light), var(--secondary-light));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    font-size: 20px;
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-weight: 600;
    font-size: var(--font-size-base);
    color: var(--text-color);
    padding: 8px 0;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

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

.nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.menu-toggle span {
    width: 100%;
    height: 2px;
    background: var(--secondary-color);
    transition: var(--transition-base);
}

/* ==================== 英雄区域 ==================== */
.hero-section {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--secondary-color) 50%, var(--secondary-light) 100%);
    color: var(--accent-color);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjAwIiBoZWlnaHQ9IjIwMCIgdmlld0JveD0iMCAwIDIwMCAyMDAiIGZpbGw9Im5vbmUiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PGNpcmNsZSBjeD0iMTAwIiBjeT0iMTAwIiByPSI1MCIgZmlsbD0iI2ZmZiIgZmlsbC1vcGFjaXR5PSIwLjEiLz48L3N2Zz4=');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.2;
}

.hero-title span {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* ==================== 卡片组件 ==================== */
.card {
    background: var(--accent-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    height: 100%;
    border: 1px solid var(--border-light);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.card-header {
    padding: 30px 30px 20px;
}

.card-body {
    padding: 0 30px 30px;
}

.card-footer {
    padding: 20px 30px;
    border-top: 1px solid var(--border-light);
    background: var(--bg-secondary);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

/* ==================== 网格系统 ==================== */
.grid {
    display: grid;
    gap: 30px;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ==================== 新闻卡片 ==================== */
.news-card {
    position: relative;
    overflow: hidden;
}

.news-card .card-image {
    height: 240px;
}

.news-badge {
    position: absolute;
    top: 20px;
    left: 20px;
    background: var(--primary-color);
    color: var(--accent-color);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.news-date {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-lighter);
    font-size: var(--font-size-sm);
    margin-bottom: 12px;
}

.news-date i {
    color: var(--primary-color);
}

.news-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: 12px;
    line-height: 1.5;
}

.news-card p {
    color: var(--text-light);
    font-size: var(--font-size-base);
    line-height: 1.6;
    margin-bottom: 20px;
}

/* ==================== 统计卡片 ==================== */
.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: var(--accent-color);
    padding: 40px 30px;
    border-radius: var(--radius-md);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
}

.stat-card h3 {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    margin-bottom: 8px;
    position: relative;
    z-index: 1;
}

.stat-card p {
    font-size: var(--font-size-base);
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

.stat-icon {
    position: absolute;
    bottom: 20px;
    right: 20px;
    font-size: 48px;
    opacity: 0.2;
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--bg-dark);
    color: var(--accent-color);
    padding: 80px 0 40px;
}

.footer-top {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 60px;
    margin-bottom: 60px;
}

.footer-logo {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
    margin-bottom: 30px;
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--accent-color);
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-bottom {
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

.social-links {
    display: flex;
    gap: 20px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    transition: var(--transition-base);
}

.social-link:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

/* ==================== 404页面 ==================== */
.error-section {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.error-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;base64,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');
    background-size: 200px 200px;
    opacity: 0.5;
    z-index: 0;
}

.error-content {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.error-icon {
    font-size: 80px;
    margin-bottom: 30px;
    color: var(--primary-color);
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

.error-code {
    font-size: 120px;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: 20px;
    text-shadow: 0 10px 20px rgba(245, 158, 11, 0.3);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.error-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-color);
}

.error-description {
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 40px;
    line-height: 1.6;
}

.error-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 40px;
    flex-wrap: wrap;
}

.error-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 60px;
}

.error-links a {
    color: var(--text-light);
    transition: var(--transition-base);
}

.error-links a:hover {
    color: var(--primary-color);
    padding-left: 10px;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* ==================== 页面头部 ==================== */
.page-header {
    padding: 160px 0 80px;
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-primary) 100%);
    text-align: center;
}

.page-header h1 {
    margin-bottom: 16px;
}

.page-header p {
    color: var(--text-light);
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto;
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* ==================== 开云主题样式 ==================== */
.cloud-bg {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 50%, var(--secondary-light) 100%);
}

.logo-icon.cloud-logo {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light), var(--secondary-light));
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1200px) {
    .footer-top {
        grid-template-columns: repeat(2, 1fr);
    }

    h1 {
        font-size: var(--font-size-4xl);
    }

    h2 {
        font-size: var(--font-size-3xl);
    }
}

@media (max-width: 992px) {
    .section-padding {
        padding: 80px 0;
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 40px;
        box-shadow: var(--shadow-lg);
        transition: left 0.3s ease;
    }

    .nav-menu.active {
        left: 0;
    }

    .menu-toggle {
        display: flex;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 6px);
    }

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

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(8px, -6px);
    }
}

@media (max-width: 768px) {
    .section-padding {
        padding: 60px 0;
    }

    .hero-section {
        padding: 140px 0 80px;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-description {
        font-size: var(--font-size-base);
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        gap: 16px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .error-code {
        font-size: 80px;
    }

    .error-title {
        font-size: 28px;
    }

    .error-description {
        font-size: 16px;
    }

    .error-actions {
        flex-direction: column;
        gap: 15px;
    }

    .error-actions .btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 16px;
    }

    h1 {
        font-size: var(--font-size-3xl);
    }

    h2 {
        font-size: var(--font-size-2xl);
    }

    .section-title h2 {
        font-size: var(--font-size-2xl);
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

/* ==================== 打印样式 ==================== */
@media print {
    .header,
    .footer,
    .error-actions {
        display: none;
    }

    body {
        background: white;
    }
}

/* ==================== 无障碍支持 ==================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==================== 深色模式支持 ==================== */
@media (prefers-color-scheme: dark) {
    /* 可以在这里添加深色模式的特定样式 */
}

/* ==================== 高对比度支持 ==================== */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid currentColor;
    }
}