/* ==========================================
   Global ID Insights - 主样式表
   ========================================== */

/* CSS 变量 */
:root {
    /* 颜色系统 */
    --color-primary: #003366;
    --color-accent: #2E8B57;
    --color-warning: #F59E0B;
    --color-background: #F8FAFC;
    --color-border: #CBD5E1;
    --color-text: #1E293B;
    --color-text-light: #64748B;
    --color-white: #FFFFFF;
    --color-dark: #0F172A;

    /* 字体 */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* 阴影 */
    --shadow-sm: 0 1px 2px 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);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-accent);
}

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

ul, ol {
    list-style: none;
}

/* 容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==========================================
   免责声明横幅
   ========================================== */
.disclaimer-banner {
    background-color: var(--color-warning);
    color: var(--color-dark);
    padding: var(--spacing-sm) var(--spacing-lg);
    text-align: center;
    font-size: 0.875rem;
    font-weight: 500;
}

.disclaimer-banner a {
    color: var(--color-dark);
    text-decoration: underline;
    margin-left: var(--spacing-md);
    font-weight: 600;
}

.disclaimer-banner a:hover {
    color: var(--color-primary);
}

/* ==========================================
   头部导航
   ========================================== */
.main-header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    flex-shrink: 0;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.logo-badge {
    font-size: 0.625rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* 头部链接 */
.header-links {
    display: flex;
    gap: var(--spacing-lg);
}

.header-links a {
    font-size: 0.875rem;
    color: var(--color-text-light);
    font-weight: 500;
}

.header-links a:hover {
    color: var(--color-accent);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    transition: all 0.3s ease;
}

/* 主导航 */
.main-nav {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
}

.nav-list {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-list a {
    display: block;
    padding: var(--spacing-sm) 0;
    font-weight: 500;
    color: var(--color-text);
    position: relative;
}

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

.nav-list a:hover::after,
.nav-list a.active::after {
    width: 100%;
}

.nav-list a.active {
    color: var(--color-accent);
}

/* ==========================================
   主内容区域
   ========================================== */
.main-content {
    min-height: calc(100vh - 400px);
}

/* ==========================================
   Hero 区域
   ========================================== */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, #004080 100%);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%232E8B57' fill-opacity='0.1'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

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

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.hero .subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background-color: #247048;
    color: var(--color-white);
}

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

.btn-secondary:hover {
    background-color: var(--color-white);
    color: var(--color-primary);
}

.hero-disclaimer {
    margin-top: var(--spacing-xl);
    font-size: 0.875rem;
    opacity: 0.8;
}

.hero-disclaimer a {
    color: var(--color-white);
    text-decoration: underline;
}

/* ==========================================
   内容区块
   ========================================== */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--color-text-light);
    text-align: center;
    margin-top: calc(-1 * var(--spacing-md));
    margin-bottom: var(--spacing-xl);
}

/* 内容网格 */
.content-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.content-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all 0.3s ease;
}

.content-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.content-card .card-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.content-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.content-card p {
    font-size: 0.875rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

.content-card .card-link {
    display: inline-block;
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent);
}

.content-card .card-link:hover {
    text-decoration: underline;
}

/* ==========================================
   免责声明框
   ========================================== */
.disclaimer-box {
    background-color: #FEF3C7;
    border: 1px solid var(--color-warning);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.disclaimer-box h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.disclaimer-box p {
    font-size: 0.875rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.disclaimer-box a {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
}

/* ==========================================
   页脚
   ========================================== */
.main-footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
}

.footer-section ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

.footer-section a:hover {
    color: var(--color-white);
}

.footer-disclaimer p {
    font-size: 0.875rem;
    line-height: 1.6;
    opacity: 0.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-copyright p {
    font-size: 0.75rem;
    opacity: 0.7;
    margin-bottom: var(--spacing-xs);
}

/* ==========================================
   页面内容样式
   ========================================== */
.page-header {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    font-size: 1rem;
    opacity: 0.9;
}

.page-content {
    padding: var(--spacing-2xl) 0;
}

.page-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary);
    margin: var(--spacing-xl) 0 var(--spacing-md);
}

.page-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin: var(--spacing-lg) 0 var(--spacing-sm);
}

.page-content p {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.page-content ul, .page-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

.page-content ul {
    list-style: disc;
}

.page-content ol {
    list-style: decimal;
}

.page-content li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

/* ==========================================
   响应式设计
   ========================================== */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    .header-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-white);
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-md);
    }

    .main-nav.active {
        display: block;
    }

    .nav-list {
        flex-direction: column;
        gap: 0;
    }

    .nav-list a {
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
    }

    .content-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .disclaimer-banner {
        font-size: 0.75rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .disclaimer-banner a {
        display: block;
        margin-left: 0;
        margin-top: var(--spacing-xs);
    }
}