/* 基础变量 */
:root {
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --secondary: #3f37c9;
    --success: #4caf50;
    --warning: #ff9800;
    --danger: #f44336;
    --info: #2196f3;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --gray-light: #e9ecef;
    --gray-dark: #495057;
    --white: #ffffff;
    --body-bg: #f5f7fb;
    --card-bg: #ffffff;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--body-bg);
}

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

a:hover {
    color: var(--primary-dark);
}

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

ul {
    list-style: none;
}

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

/* 导航栏 */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}

.logo i {
    font-size: 24px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--gray-dark);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-nav {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-greeting {
    color: var(--gray-dark);
    font-weight: 500;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--gray-dark);
    cursor: pointer;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(67, 97, 238, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

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

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-block {
    display: flex;
    width: 100%;
}

/* 主内容 */
.main-content {
    min-height: calc(100vh - 64px - 300px);
}

/* 页面头部 */
.page-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 48px 0;
    text-align: center;
}

.page-header h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
}

.page-header p {
    font-size: 18px;
    opacity: 0.9;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    padding: 80px 0;
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 42px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 20px;
}

.hero-title .highlight {
    display: block;
    background: linear-gradient(120deg, #ffd700 0%, #ffed4a 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 32px;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

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

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
}

.stat-label {
    font-size: 14px;
    opacity: 0.8;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.hero-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 320px;
    overflow: hidden;
}

.card-header {
    background: var(--gray-light);
    padding: 12px 16px;
    display: flex;
    gap: 8px;
}

.card-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.card-dot.red { background: #ff5f57; }
.card-dot.yellow { background: #ffbd2e; }
.card-dot.green { background: #28c840; }

.card-body {
    padding: 20px;
}

.risk-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    margin-bottom: 12px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
}

.risk-item.high {
    background: #ffebee;
    color: var(--danger);
}

.risk-item.medium {
    background: #fff3e0;
    color: var(--warning);
}

.risk-item.low {
    background: #e8f5e9;
    color: var(--success);
}

/* 场景区域 */
.scenarios {
    padding: 80px 0;
    background: var(--white);
}

.section-title {
    text-align: center;
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--dark);
}

.section-subtitle {
    text-align: center;
    font-size: 16px;
    color: var(--gray);
    margin-bottom: 48px;
}

.scenario-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.scenario-card {
    background: var(--white);
    border: 1px solid var(--gray-light);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.scenario-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.scenario-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 28px;
    color: var(--white);
}

.scenario-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.scenario-card p {
    color: var(--gray);
    margin-bottom: 20px;
}

.scenario-features {
    text-align: left;
    margin-bottom: 24px;
}

.scenario-features li {
    padding: 6px 0;
    color: var(--gray-dark);
    font-size: 14px;
}

.scenario-features li i {
    color: var(--success);
    margin-right: 8px;
}

/* 功能区域 */
.features {
    padding: 80px 0;
    background: var(--body-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-item {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 24px;
    color: var(--white);
}

.feature-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-item p {
    color: var(--gray);
    font-size: 14px;
}

/* 流程区域 */
.process {
    padding: 80px 0;
    background: var(--white);
}

.process-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
}

.step {
    text-align: center;
    flex: 1;
    max-width: 250px;
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    margin: 0 auto 16px;
}

.step-content h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.step-content p {
    color: var(--gray);
    font-size: 14px;
}

.step-connector {
    font-size: 24px;
    color: var(--primary);
}

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

/* 用户评价 */
.testimonials {
    padding: 80px 0;
    background: var(--body-bg);
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.testimonial-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.testimonial-content {
    margin-bottom: 20px;
}

.testimonial-content p {
    color: var(--gray-dark);
    font-style: italic;
    line-height: 1.6;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.author-info h4 {
    font-size: 14px;
    font-weight: 600;
}

.author-info span {
    font-size: 12px;
    color: var(--gray);
}

/* CTA区域 */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    text-align: center;
}

.cta h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
}

.cta p {
    font-size: 18px,
    opacity: 0.9,
    margin-bottom: 24px;
}

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

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

/* 页脚 */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 16px;
    font-weight: 600;
}

.footer-section p {
    color: #adb5bd;
    font-size: 14px;
    line-height: 1.6;
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul a {
    color: #adb5bd;
    font-size: 14px;
}

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

.footer-section .contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    color: #adb5bd;
    font-size: 14px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
}

.footer-bottom .disclaimer {
    font-size: 12px;
    color: #adb5bd;
    margin-bottom: 12px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.footer-bottom p:last-child {
    font-size: 14px;
    color: #6c757d;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

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

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

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow);
    }

    .nav-links.active {
        display: flex;
    }

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

    .hero-subtitle {
        font-size: 16px;
    }

    .scenario-grid,
    .features-grid,
    .testimonial-grid {
        grid-template-columns: 1fr;
    }

    .process-steps {
        flex-direction: column;
    }

    .step-connector {
        transform: rotate(90deg);
    }

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

    .section-title {
        font-size: 24px;
    }
}

/* 错误页面 */
.error-page {
    padding: 100px 0;
    text-align: center;
}

.error-content {
    max-width: 500px;
    margin: 0 auto;
}

.error-icon {
    font-size: 64px;
    color: var(--gray);
    margin-bottom: 24px;
}

.error-content h1 {
    font-size: 72px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
}

.error-content h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
}

.error-content p {
    color: var(--gray);
    margin-bottom: 32px;
}

.error-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* 面包屑 */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.8);
}

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

.breadcrumb i {
    font-size: 10px;
    opacity: 0.6;
}

.breadcrumb span {
    color: var(--white);
}

/* 加载更多 */
.load-more {
    text-align: center;
    padding: 40px 0;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 80px 0;
    color: var(--gray);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 20px;
    margin-bottom: 8px;
}