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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
}

/* 导航栏 - 玻璃拟态效果 */
.navbar {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

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

.nav-logo {
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}
/* 菜单切换按钮（桌面端隐藏） */
.nav-toggle {
    display: none;
    width: 28px;
    height: 22px;
    background: transparent;
    border: 0;
    padding: 0;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background: #4a5568;
    border-radius: 2px;
    transition: transform .3s ease, opacity .3s ease;
}

.nav-toggle span + span { margin-top: 6px; }

.nav-toggle.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* 移动端遮罩层 */
.mobile-overlay {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,.4);
    z-index: 1000;
    opacity: 0;
    transition: opacity .3s ease;
}

.mobile-overlay.active { display: block; opacity: 1; }

/* 菜单切换按钮（桌面端隐藏） */
.nav-toggle {
    display: none;
    width: 28px;
    height: 22px;
    background: transparent;
    border: 0;
    padding: 0;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    height: 2px;
    width: 100%;
    background: #4a5568;
    border-radius: 2px;
    transition: transform .3s ease, opacity .3s ease;
}

.nav-toggle span + span { margin-top: 6px; }

.nav-link {
    font-size: 16px;
    color: #4a5568;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 8px 0;
}

.nav-link:hover {
    color: #667eea;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
    transition: width 0.3s ease;
}

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

.nav-login-btn {
    padding: 12px 28px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
    border: none;
    cursor: pointer;
}

.nav-login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.4);
}

/* 英雄区域 */
.hero {
    padding-top: 150px;
    padding-bottom: 100px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    text-align: center;
    margin-top: 70px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="10" cy="60" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="90" cy="40" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero h1 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    color: white;
    line-height: 1.2;
    position: relative;
    z-index: 1;
}

.hero p {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
    z-index: 1;
}

.hero-highlight {
    color: #ffd700;
    font-weight: 700;
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.btn {
    padding: 15px 30px;
    border-radius: 30px;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    display: inline-block;
    text-align: center;
    min-width: 150px;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: white;
    color: #667eea;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* 服务特点 */
.services {
    padding: 100px 0;
    background: white;
    position: relative;
}

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

.section-title h2 {
    font-size: 42px;
    font-weight: 800;
    color: #1a1a1a;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

.section-title p {
    font-size: 18px;
    color: #666;
    max-width: 700px;
    margin: 0 auto;
    margin-top: 20px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.service-card {
    background: white;
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.service-icon {
    font-size: 56px;
    margin-bottom: 20px;
    display: inline-block;
    transition: transform 0.3s ease;
}

.service-card:hover .service-icon {
    transform: scale(1.1);
}

.service-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.service-card p {
    font-size: 16px;
    color: #666;
    line-height: 1.6;
}

/* 技术优势 */
.features {
    padding: 100px 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.features-container {
    display: flex;
    flex-direction: column;
    gap: 50px;
}

.feature-item {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 40px;
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-item:nth-child(even) {
    flex-direction: row-reverse;
}

.feature-image {
    flex: 1;
    max-width: 500px;
}

.feature-content {
    flex: 1;
}

.feature-content h3 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 20px;
    color: #1a1a1a;
    position: relative;
}

.feature-content h3::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

.feature-content p {
    font-size: 17px;
    color: #666;
    margin-bottom: 15px;
    line-height: 1.7;
}

/* 报告展示 */
.reports {
    padding: 100px 0;
    background: white;
}

.reports-showcase {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    flex-wrap: wrap;
}

.report-item {
    text-align: center;
    max-width: 300px;
    transition: transform 0.3s ease;
}

.report-item:hover {
    transform: translateY(-10px);
}

.report-image {
    width: 100%;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.report-image:hover {
    transform: scale(1.05);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

.report-item h4 {
    margin-top: 20px;
    font-size: 18px;
    font-weight: 700;
    color: #1a1a1a;
}

/* 底部CTA */
.cta-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="10" cy="60" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="90" cy="40" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.cta-section h2 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.cta-section p {
    font-size: 20px;
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

.cta-section .btn {
    background: white;
    color: #667eea;
    margin: 0 10px;
    position: relative;
    z-index: 1;
}

.cta-section .btn:hover {
    background: #f8f9fa;
}

/* 页脚 */
.footer {
    background: #1a1a1a;
    color: #a0aec0;
    padding: 60px 0 30px;
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
}

.footer-column h4 {
    color: white;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: #a0aec0;
    transition: all 0.3s ease;
    position: relative;
}

.footer-links a:hover {
    color: white;
    transform: translateX(5px);
}

.footer-links a::before {
    content: '→';
    position: absolute;
    left: -15px;
    opacity: 0;
    transition: all 0.3s ease;
}

.footer-links a:hover::before {
    opacity: 1;
    left: -10px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #2d3748;
    font-size: 14px;
}

.footer-legal {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #2d3748;
    font-size: 12px;
    color: #718096;
    line-height: 1.5;
}

.footer-legal p {
    margin: 5px 0;
}

.footer-legal a {
    color: #a0aec0;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-legal a:hover {
    color: white;
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 42px;
    }
    
    .feature-item,
    .feature-item:nth-child(even) {
        flex-direction: column;
        text-align: center;
    }
    
    .feature-content h3::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .feature-image {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav-container { position: relative; }
    .nav-menu {
        display: none;
        position: absolute;
        top: 60px;
        right: 20px;
        left: 20px;
        background: #fff;
        border: 1px solid #e5e7eb;
        border-radius: 10px;
        padding: 10px 0;
        box-shadow: 0 10px 25px rgba(0,0,0,.08);
        flex-direction: column;
        gap: 0;
        z-index: 1001;
    }
    .nav-menu.active { display: flex; }
    .nav-menu .nav-item a {
        padding: 12px 16px;
        display: block;
        color: #374151;
    }
    .nav-menu .nav-item + .nav-item a { border-top: 1px solid #f3f4f6; }
    .nav-toggle { display: block; }
    .nav-container { position: relative; }
    .nav-menu {
        display: none;
        position: absolute;
        top: 60px;
        right: 20px;
        left: 20px;
        background: #fff;
        border: 1px solid #e5e7eb;
        border-radius: 10px;
        padding: 10px 0;
        box-shadow: 0 10px 25px rgba(0,0,0,.08);
        flex-direction: column;
        gap: 0;
        z-index: 1001;
    }
    .nav-menu.active { display: flex; }
    .nav-menu .nav-item a {
        padding: 12px 16px;
        display: block;
        color: #374151;
    }
    .nav-menu .nav-item + .nav-item a { border-top: 1px solid #f3f4f6; }
    
    .hero {
        padding-top: 120px;
        padding-bottom: 80px;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .hero p {
        font-size: 18px;
    }
    
    .btn {
        padding: 12px 24px;
        font-size: 16px;
        width: 100%;
        max-width: 300px;
    }
    
    .section-title h2 {
        font-size: 32px;
    }
    
    .service-card {
        padding: 20px;
    }
    
    .feature-item {
        padding: 20px;
    }
}

@media (max-width: 576px) {
    .hero h1 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .section-title h2 {
        font-size: 28px;
    }
    
    .feature-content h3 {
        font-size: 24px;
    }
}

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

.service-card, .feature-item, .report-item {
    animation: fadeInUp 0.6s ease-out;
}

.service-card:nth-child(2) {
    animation-delay: 0.1s;
}

.service-card:nth-child(3) {
    animation-delay: 0.2s;
}

.service-card:nth-child(4) {
    animation-delay: 0.3s;
}

.service-card:nth-child(5) {
    animation-delay: 0.4s;
}

.service-card:nth-child(6) {
    animation-delay: 0.5s;
}

/* 公告弹窗样式 */
.announcement-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.announcement-modal.show {
    display: flex;
    opacity: 1;
}

.announcement-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    padding: 0;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    transform: scale(0.9);
    transition: transform 0.3s ease;
    position: relative;
    overflow: hidden;
}

.announcement-modal.show .announcement-content {
    transform: scale(1);
}

.announcement-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #ff6b6b, #4ecdc4, #45b7d1, #96ceb4, #ffeaa7);
    animation: rainbow 3s linear infinite;
}

@keyframes rainbow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.announcement-header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 25px 30px 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.announcement-icon {
    font-size: 28px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.announcement-header h3 {
    color: white;
    font-size: 22px;
    font-weight: 700;
    margin: 0;
    flex: 1;
}

.close-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 10px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: white;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

.announcement-body {
    padding: 30px;
    background: white;
}

.announcement-text {
    color: #4a5568;
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: 15px;
    text-align: justify;
}

.announcement-text:last-child {
    margin-bottom: 0;
}

.announcement-text strong {
    color: #667eea;
    font-weight: 600;
}

.announcement-footer {
    padding: 20px 30px 30px;
    background: white;
    border-top: 1px solid #e2e8f0;
    text-align: center;
}

.confirm-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 12px;
    padding: 14px 40px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.confirm-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.6);
}

.confirm-btn:active {
    transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .announcement-content {
        width: 95%;
        margin: 20px;
    }
    
    .announcement-header {
        padding: 20px 25px 15px;
    }
    
    .announcement-header h3 {
        font-size: 20px;
    }
    
    .announcement-body {
        padding: 25px;
    }
    
    .announcement-text {
        font-size: 15px;
    }
    
    .announcement-footer {
        padding: 15px 25px 25px;
    }
}