/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #1a237e;
    --secondary: #283593;
    --accent: #00e676;
    --dark: #0d1b2a;
    --darker: #050a14;
    --light: #f8f9fa;
    --white: #ffffff;
    --text: #1a202c;
    --text-light: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.2);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--white);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 全屏横幅 */
.fullscreen-hero {
    position: relative;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--dark) 0%, var(--darker) 100%);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;
}

.fullscreen-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://tse-mm.bing.com/th?q=暗网禁区') center/cover no-repeat;
    opacity: 0.15;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, rgba(13, 27, 42, 0.8) 0%, rgba(5, 10, 20, 0.95) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* 顶部导航 */
.top-nav {
    padding: 20px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

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

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

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 3px;
    transition: all 0.3s;
}

/* 横幅文字 */
.hero-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 60px 20px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero-title {
    font-size: 64px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 24px;
    color: var(--accent);
    margin-bottom: 25px;
    font-weight: 500;
}

.hero-desc {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
    max-width: 800px;
    margin-bottom: 40px;
}

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

.cta-button {
    padding: 16px 40px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.3s;
    display: inline-block;
}

.cta-button:not(.outline) {
    background: var(--accent);
    color: var(--dark);
}

.cta-button:not(.outline):hover {
    background: #00d96a;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 230, 118, 0.3);
}

.cta-button.outline {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--accent);
}

.cta-button.outline:hover {
    background: var(--accent);
    color: var(--dark);
    transform: translateY(-2px);
}

/* 滚动提示 */
.scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    z-index: 2;
}

.arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--accent);
    border-bottom: 2px solid var(--accent);
    transform: rotate(45deg);
    margin: 10px auto;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) rotate(45deg);
    }
    40% {
        transform: translateY(-10px) rotate(45deg);
    }
    60% {
        transform: translateY(-5px) rotate(45deg);
    }
}

/* 分屏区块 */
.split-section {
    padding: 100px 0;
    background: var(--white);
}

.split-section.reverse {
    background: var(--light);
}

.split-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.split-section.reverse .split-content {
    grid-template-columns: 1fr 1fr;
}

.split-section.reverse .content-image {
    order: -1;
}

.content-text {
    animation: fadeInLeft 0.8s ease-out;
}

.content-image {
    animation: fadeInRight 0.8s ease-out;
}

.content-image img {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.section-heading {
    font-size: 42px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 15px;
}

.heading-line {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    margin-bottom: 30px;
    border-radius: 2px;
}

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

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

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

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

/* 优势列表 */
.advantages-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.advantage-point {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.point-icon {
    width: 40px;
    height: 40px;
    background: var(--accent);
    color: var(--dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    flex-shrink: 0;
}

.point-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}

.point-content p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.6;
    margin: 0;
}

/* 功能区块 */
.features-section {
    padding: 100px 0;
    background: var(--light);
}

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

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

.section-intro {
    font-size: 18px;
    color: var(--text-light);
    margin-top: 15px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

.feature-box {
    background: var(--white);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    text-align: center;
}

.feature-box:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.feature-img {
    width: 100%;
    height: 180px;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 20px;
}

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

.feature-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.6;
}

/* 页面横幅 */
.page-hero {
    position: relative;
    min-height: 400px;
    background: linear-gradient(135deg, var(--dark) 0%, var(--darker) 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding-bottom: 60px;
}

.page-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://tse-mm.bing.com/th?q=暗网禁区') center/cover no-repeat;
    opacity: 0.15;
    z-index: 0;
}

.page-hero .hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, rgba(13, 27, 42, 0.8) 0%, rgba(5, 10, 20, 0.95) 100%);
    z-index: 1;
}

.page-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.page-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 15px;
}

.page-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.8);
    max-width: 700px;
    margin: 0 auto;
}

/* 系统介绍 */
.system-intro,
.services-intro {
    padding: 80px 0;
    background: var(--white);
}

.intro-content {
    max-width: 900px;
    margin: 0 auto;
}

.intro-content h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 25px;
}

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

/* 系统功能 */
.system-features {
    padding: 80px 0;
    background: var(--light);
}

/* 服务列表 */
.services-list {
    padding: 80px 0;
    background: var(--white);
}

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

.service-card {
    background: var(--light);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.service-img {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

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

.service-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text);
    padding: 20px 20px 10px;
    margin: 0;
}

.service-desc {
    font-size: 15px;
    color: var(--text-light);
    padding: 0 20px 20px;
    line-height: 1.6;
    margin: 0;
}

/* 信息区块 */
.info-section {
    padding: 60px 0;
    background: var(--light);
}

.info-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.info-content h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 20px;
}

.info-content p {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
}

/* 页脚 */
.site-footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0 20px;
    margin-top: 80px;
}

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

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

.footer-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--accent);
}

.footer-text {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.7);
}

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

.footer-nav li {
    margin-bottom: 10px;
}

.footer-nav a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-nav a:hover {
    color: var(--accent);
}

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

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

/* 响应式设计 */
@media (max-width: 968px) {
    .split-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .split-section.reverse .content-image {
        order: 0;
    }

    .hero-title {
        font-size: 48px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: var(--dark);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        box-shadow: var(--shadow);
        transition: left 0.3s;
        z-index: 1000;
    }

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

    .nav-menu .nav-link {
        display: block;
        padding: 15px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-toggle {
        display: flex;
    }

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

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

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .hero-title {
        font-size: 36px;
    }

    .section-heading {
        font-size: 32px;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

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

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .cta-button {
        width: 100%;
        text-align: center;
    }
}