/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0066ff;
    --primary-dark: #0052cc;
    --primary-light: #3385ff;
    --secondary-color: #00d4aa;
    --accent-color: #ff6b35;
    --background-dark: #0a0e27;
    --background-medium: #1a1f3a;
    --background-light: #252b4a;
    --text-primary: #ffffff;
    --text-secondary: #b8c1d9;
    --text-muted: #6b7494;
    --border-color: #2d3558;
    --shadow-light: 0 2px 8px rgba(0, 102, 255, 0.1);
    --shadow-medium: 0 4px 16px rgba(0, 102, 255, 0.15);
    --shadow-heavy: 0 8px 32px rgba(0, 102, 255, 0.2);
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--background-dark) 0%, var(--background-medium) 100%);
    overflow-x: hidden;
}

/* ==================== 容器 ==================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==================== 导航栏 ==================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-medium);
}

header.scrolled {
    background: rgba(10, 14, 39, 0.98);
    box-shadow: var(--shadow-medium);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    height: 40px;
    transition: var(--transition-medium);
}

.logo img:hover {
    transform: scale(1.05);
}

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

.nav-menu li a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

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

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

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

.btn-register {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--text-primary) !important;
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition-medium);
}

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

.btn-register::after {
    display: none;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: var(--transition-medium);
}

/* ==================== Hero区域 ==================== */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 120px 20px 80px;
    max-width: 1400px;
    margin: 0 auto;
    gap: 60px;
}

.hero-content {
    flex: 1;
    animation: fadeInUp 1s ease;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 24px;
    color: var(--secondary-color);
    margin-bottom: 15px;
    font-weight: 600;
}

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 50px;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition-medium);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--text-primary);
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

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

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

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 10px 24px;
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--text-primary);
}

.btn-large {
    padding: 18px 40px;
    font-size: 18px;
}

.hero-stats {
    display: flex;
    gap: 50px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

.hero-image {
    flex: 1;
    animation: fadeInRight 1s ease 0.3s both;
}

.hero-image img {
    width: 100%;
    max-width: 600px;
    border-radius: 20px;
    box-shadow: var(--shadow-heavy);
}

/* ==================== 核心特性区 ==================== */
#features {
    padding: 100px 20px;
    background: var(--background-medium);
}

#features h2 {
    text-align: center;
    font-size: 40px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.section-subtitle {
    text-align: center;
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--background-light);
    padding: 40px 30px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: var(--transition-medium);
    animation: fadeInUp 0.6s ease both;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }

.feature-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-heavy);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 25px;
    border-radius: 16px;
    overflow: hidden;
}

.feature-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

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

/* ==================== 服务介绍区 ==================== */
#services {
    padding: 100px 20px;
    background: var(--background-dark);
}

#services h2 {
    text-align: center;
    font-size: 40px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

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

.service-item {
    display: flex;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
    animation: fadeInUp 0.8s ease both;
}

.service-item:nth-child(even) {
    animation-delay: 0.2s;
}

.service-item.reverse {
    flex-direction: row-reverse;
}

.service-image {
    flex: 1;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-heavy);
    transition: var(--transition-medium);
}

.service-image:hover {
    transform: scale(1.03);
}

.service-image img {
    width: 100%;
    height: auto;
    display: block;
}

.service-text {
    flex: 1;
}

.service-text h3 {
    font-size: 32px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.service-text p {
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 25px;
}

/* ==================== 关于我们区 ==================== */
#about {
    padding: 100px 20px;
    background: var(--background-medium);
}

#about h2 {
    text-align: center;
    font-size: 40px;
    margin-bottom: 60px;
    color: var(--text-primary);
}

.about-content {
    display: flex;
    gap: 60px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.about-text {
    flex: 1;
}

.about-text p {
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-image {
    flex: 1;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-heavy);
}

.about-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* ==================== 常见问题区 ==================== */
#faq {
    padding: 100px 20px;
    background: var(--background-dark);
}

#faq h2 {
    text-align: center;
    font-size: 40px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--background-light);
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    transition: var(--transition-medium);
    animation: fadeInUp 0.6s ease both;
}

.faq-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-medium);
}

.faq-item h3 {
    font-size: 20px;
    color: var(--primary-color);
    margin-bottom: 15px;
    cursor: pointer;
}

.faq-item p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 15px;
}

/* ==================== 行动号召区 ==================== */
#cta {
    padding: 100px 20px;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    text-align: center;
}

.cta-content h2 {
    font-size: 40px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.cta-content p {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 15px;
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 40px;
}

#cta .btn-primary {
    background: var(--text-primary);
    color: var(--primary-color);
}

#cta .btn-primary:hover {
    background: var(--background-light);
}

#cta .btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--text-primary);
}

#cta .btn-secondary:hover {
    background: var(--text-primary);
    color: var(--primary-color);
}

/* ==================== 页脚 ==================== */
footer {
    background: var(--background-dark);
    padding: 60px 20px 30px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto 40px;
}

.footer-section h4 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 20px;
}

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

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

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 10px;
}

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    #hero {
        flex-direction: column;
        text-align: center;
        padding-top: 100px;
    }
    
    .hero-content h1 {
        font-size: 40px;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-image {
        order: -1;
    }
    
    .service-item,
    .service-item.reverse {
        flex-direction: column;
        text-align: center;
    }
    
    .about-content {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--background-dark);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        border-top: 1px solid var(--border-color);
        display: none;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .hero-content h1 {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 20px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 30px;
    }
    
    .stat-number {
        font-size: 24px;
    }
    
    #features h2,
    #services h2,
    #about h2,
    #faq h2,
    .cta-content h2 {
        font-size: 32px;
    }
    
    .service-text h3 {
        font-size: 26px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    #features h2,
    #services h2,
    #about h2,
    #faq h2,
    .cta-content h2 {
        font-size: 26px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .service-item {
        margin-bottom: 60px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .btn-large {
        padding: 14px 28px;
        font-size: 16px;
    }
}

/* ==================== 滚动条样式 ==================== */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--background-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--background-light);
    border-radius: 5px;
}

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

/* ==================== 选择文本样式 ==================== */
::selection {
    background: var(--primary-color);
    color: var(--text-primary);
}

::-moz-selection {
    background: var(--primary-color);
    color: var(--text-primary);
}