/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #FF6B35;
    --primary-light: #FF8C66;
    --primary-dark: #E55529;
    --secondary-color: #2C3E50;
    --accent-color: #3498DB;
    --text-dark: #2C3E50;
    --text-light: #7F8C8D;
    --bg-light: #F8F9FA;
    --bg-white: #FFFFFF;
    --border-color: #E9ECEF;
    --shadow-light: rgba(44, 62, 80, 0.1);
    --shadow-medium: rgba(44, 62, 80, 0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

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

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 20px var(--shadow-light);
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h1 {
    color: var(--primary-color);
    font-size: 24px;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    gap: 30px;
    align-items: center;
}

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

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero 区域 */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    overflow: hidden;
}

.hero-content {
    text-align: center;
    margin-bottom: 60px;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.highlight {
    color: var(--primary-color);
    position: relative;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-light);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(255, 107, 53, 0.4);
}

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

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.hero-visual {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.visual-card {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: 0 8px 30px var(--shadow-light);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.visual-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px var(--shadow-medium);
}

.card-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.visual-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.visual-card p {
    color: var(--text-light);
    font-size: 14px;
}

/* 通用section样式 */
section {
    padding: 80px 0;
}

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

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.section-header p {
    font-size: 18px;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* 关于我们区域 */
.about {
    background: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.about-text p {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 30px;
    line-height: 1.7;
}

.features {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.feature {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.feature-icon {
    font-size: 24px;
    margin-top: 5px;
}

.feature-content h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-dark);
}

.feature-content p {
    font-size: 14px;
    color: var(--text-light);
    margin: 0;
}

/* 圆形图表 */
.about-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.circle-diagram {
    position: relative;
    width: 300px;
    height: 300px;
}

.center-circle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 18px;
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.3);
}

.orbit-item {
    position: absolute;
    width: 80px;
    height: 80px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    font-size: 14px;
    color: var(--text-dark);
    box-shadow: 0 4px 20px var(--shadow-light);
    border: 2px solid var(--border-color);
}

.orbit-1 {
    top: 0;
    left: 50%;
    transform: translateX(-50%);
}

.orbit-2 {
    top: 50%;
    right: 0;
    transform: translateY(-50%);
}

.orbit-3 {
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

.orbit-4 {
    top: 50%;
    left: 0;
    transform: translateY(-50%);
}

/* 架构区域 */
.architecture-content {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 40px;
    align-items: center;
    margin-top: 40px;
}

.arch-item {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 30px var(--shadow-light);
    border: 1px solid var(--border-color);
}

.arch-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.arch-icon {
    font-size: 32px;
}

.arch-header h3 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-dark);
}

.arch-description p {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.6;
}

.arch-description ul {
    list-style: none;
}

.arch-description li {
    padding: 8px 0;
    color: var(--text-light);
    position: relative;
    padding-left: 20px;
}

.arch-description li::before {
    content: '•';
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.arch-connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.connector-line {
    width: 2px;
    height: 60px;
    background: linear-gradient(to bottom, var(--primary-color), var(--primary-light));
}

.connector-dot {
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border-radius: 50%;
}

/* 优势区域 */
.advantages {
    background: var(--bg-light);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.advantage-card {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 30px var(--shadow-light);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.advantage-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px var(--shadow-medium);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.advantage-card .card-icon {
    font-size: 32px;
}

.advantage-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
}

.advantage-card p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 联系区域 */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
}

.contact-icon {
    font-size: 24px;
    color: var(--primary-color);
    margin-top: 5px;
}

.contact-details h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-dark);
}

.contact-details p {
    color: var(--text-light);
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 30px var(--shadow-light);
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 16px;
    transition: var(--transition);
    background: var(--bg-light);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* 页脚 */
.footer {
    background: var(--secondary-color);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 20px;
    color: white;
}

.footer-section h3 {
    color: var(--primary-color);
    font-size: 24px;
}

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

.footer-section li {
    margin-bottom: 10px;
    white-space: nowrap;
}

.footer-section a {
    color: #BDC3C7;
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid #34495E;
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-copyright,
.footer-legal {
    color: #BDC3C7;
    font-size: 14px;
}

.beian-info {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.public-security-beian,
.icp-beian {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    opacity: 0.7;
    transition: var(--transition);
}

.beian-icon {
    width: 16px;
    height: 16px;
    display: inline-block;
}

.beian-icon:error {
    display: none;
}

.beian-link {
    color: #BDC3C7;
    text-decoration: none;
    transition: var(--transition);
}

.beian-link:hover {
    opacity: 1;
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 20px 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero-title {
        font-size: 32px;
    }

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

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

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .architecture-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .arch-connector {
        order: 2;
        flex-direction: row;
    }

    .connector-line {
        width: 60px;
        height: 2px;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .circle-diagram {
        width: 250px;
        height: 250px;
    }

    .center-circle {
        width: 100px;
        height: 100px;
        font-size: 16px;
    }

    .orbit-item {
        width: 60px;
        height: 60px;
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 100px 0 60px;
    }

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

    .section-header h2 {
        font-size: 28px;
    }

    section {
        padding: 60px 0;
    }

    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }

    .visual-card,
    .advantage-card {
        padding: 20px;
    }

    .arch-item {
        padding: 30px 20px;
    }

    .contact-form {
        padding: 30px 20px;
    }

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

    .footer-section li {
        font-size: 12px;
        white-space: normal;
        word-break: keep-all;
        line-height: 1.5;
    }

    .beian-info {
        align-items: center;
    }

    .public-security-beian,
    .icp-beian {
        justify-content: center;
        font-size: 11px;
    }
}

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

.hero-content,
.about-content,
.architecture-content,
.advantages-grid,
.contact-content {
    animation: fadeInUp 0.8s ease-out;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

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

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}