/* 基础样式与变量定义 */
:root {
    --primary: #0066cc;
    --primary-dark: #0052a3;
    --secondary: #00a896;
    --dark: #1a2b3c;
    --light: #f8fafc;
    --gray: #6c757d;
    --light-gray: #e9ecef;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
    --border-radius: 10px;
}

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

body {
    font-family: 'Inter', 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
}

.logo-text span {
    color: var(--primary);
}

.global-tag {
    background-color: var(--primary);
    color: white;
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 3px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-menu a:after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: var(--transition);
}

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

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

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

.language-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 5px 10px;
    border-radius: 5px;
    transition: var(--transition);
}

.language-switcher:hover {
    background-color: var(--light-gray);
}

/* 通用按钮样式 */
.cta-button {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    padding: 15px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 102, 204, 0.3);
}

.cta-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 102, 204, 0.4);
}

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

.secondary-button:hover {
    background-color: rgba(0, 102, 204, 0.05);
}

/* 页面标题样式 */
.page-header {
    padding: 140px 0 60px;
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.05) 0%, rgba(0, 168, 150, 0.05) 100%);
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    color: var(--dark);
    margin-bottom: 20px;
}

.page-header p {
    font-size: 1.2rem;
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
}

/* 通用内容区域样式 */
.content-section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--dark);
    margin-bottom: 15px;
}

.section-title p {
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
}

/* 卡片样式 */
.card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

/* 页脚样式 */
footer {
    background-color: var(--dark);
    color: white;
    padding: 70px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.footer-column h3 {
    font-size: 1.3rem;
    margin-bottom: 25px;
    color: white;
}

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

.footer-column ul li {
    margin-bottom: 15px;
}

.footer-column ul li a {
    color: #b0b7c3;
    text-decoration: none;
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: white;
    padding-left: 5px;
}

.contact-info {
    color: #b0b7c3;
}

.contact-info p {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #b0b7c3;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .page-header h1 {
        font-size: 2.5rem;
    }

    .section-title h2 {
        font-size: 2rem;
    }
}

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

    .page-header h1 {
        font-size: 2rem;
    }

    .section-title h2 {
        font-size: 1.8rem;
    }

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

/* 动画 */
@keyframes pulse {
    0% {
        transform: translate(-50%, -50%) scale(0.8);
        opacity: 0.8;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.5);
        opacity: 0;
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}