@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
    --primary-color: #1a1a2e; /* 深黑蓝色 - 象征"黑" */
    --secondary-color: #16213e; /* 深蓝色 - 表现科技感 */
    --accent-color: #0f3460; /* 中蓝色 - 辅助色 */
    --accent-color-2: #e94560; /* 亮红色 - 点缀色，象征"峰"的高度和锐利 */
    --accent-color-3: #533483; /* 紫色 - 第三强调色，代表创新 */
    --dark-color: #0f0f0f; /* 纯黑色 */
    --light-color: #f5f5f5;
    --text-color: #333;
    --text-light: #fff;
    --gray-color: #616161; /* 中灰色，用于过渡元素 */
    --transition: all 0.3s ease;
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color)); /* 黑到蓝渐变 - 象征山峰剪影 */
    --gradient-accent: linear-gradient(135deg, var(--accent-color), var(--accent-color-2)); /* 蓝到红渐变 - 象征山峰日出 */
    --box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    --box-shadow-hover: 0 15px 30px rgba(0, 0, 0, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-color);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--gradient-accent);
    color: var(--text-light);
    border: none;
    border-radius: 4px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    z-index: -1;
    opacity: 0;
    transition: var(--transition);
}

.btn:hover::before {
    opacity: 1;
}

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

.section-title {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

/* Header styles */
header {
    background: var(--gradient-primary);
    color: var(--text-light);
    padding: 20px 0;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: var(--box-shadow);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-color-2);
    margin-bottom: 5px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.logo p {
    font-size: 0.8rem;
    opacity: 0.9;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    padding: 8px 0;
    position: relative;
    font-weight: 500;
    transition: var(--transition);
}

nav ul li a:hover {
    color: var(--accent-color-2);
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color-2);
    transition: var(--transition);
}

nav ul li a:hover::after {
    width: 100%;
}

/* Hero section */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(15, 15, 15, 0.8), rgba(15, 15, 15, 0.8)), url('https://images.unsplash.com/photo-1518770660439-4636190af475?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--text-light);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.7), rgba(15, 52, 96, 0.7));
    z-index: 1;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero h2 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* About section */
.about {
    padding: 120px 0 100px;
    background-color: var(--light-color);
    position: relative;
    overflow: hidden;
}

.about::before {
    content: '';
    position: absolute;
    top: -150px;
    right: -150px;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(15, 52, 96, 0.1), rgba(233, 69, 96, 0.1));
    z-index: 0;
}

.about-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
    position: relative;
    z-index: 1;
}

.about-text {
    flex: 1;
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: #444;
}

.about-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.tech-icon {
    font-size: 180px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    opacity: 0.9;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-15px);
    }
    100% {
        transform: translateY(0px);
    }
}

/* Services section */
.services {
    padding: 100px 0;
    background: linear-gradient(to bottom, #f5f5f5, #e8e8e8);
    position: relative;
    overflow: hidden;
}

.services::after {
    content: '';
    position: absolute;
    bottom: -150px;
    left: -150px;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(83, 52, 131, 0.1), rgba(15, 52, 96, 0.1));
    z-index: 0;
}

.service-categories {
    display: flex;
    flex-direction: column;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.category-title {
    font-size: 1.8rem;
    color: var(--accent-color);
    margin-bottom: 30px;
    text-align: center;
    position: relative;
}

.category-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: 1.5px;
}

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

.service-card {
    background-color: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: var(--gradient-primary);
    z-index: -1;
}

.category:nth-child(1) .service-card::before {
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
}

.category:nth-child(2) .service-card::before {
    background: linear-gradient(to right, var(--accent-color), var(--accent-color-2));
}

.category:nth-child(3) .service-card::before {
    background: linear-gradient(to right, var(--accent-color-2), var(--accent-color-3));
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--box-shadow-hover);
}

.service-card .icon {
    font-size: 50px;
    margin-bottom: 20px;
    color: var(--accent-color);
    transition: var(--transition);
}

.category:nth-child(1) .service-card .icon {
    color: var(--accent-color);
}

.category:nth-child(2) .service-card .icon {
    color: var(--accent-color-2);
}

.category:nth-child(3) .service-card .icon {
    color: var(--accent-color-3);
}

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

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.service-card p {
    color: #666;
}

/* Contact section */
.contact {
    padding: 100px 0;
    background-color: var(--light-color);
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(15, 52, 96, 0.1), rgba(22, 33, 62, 0.1));
    z-index: 0;
}

.contact-content {
    display: flex;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.contact-info {
    max-width: 600px;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 25px;
}

.contact-item i {
    font-size: 24px;
    color: var(--accent-color-2);
    margin-right: 15px;
}

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

.form-group input, .form-group textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--accent-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(15, 52, 96, 0.2);
}

.form-group textarea {
    height: 150px;
    resize: vertical;
}

/* Footer */
footer {
    background: var(--gradient-primary);
    color: var(--text-light);
    padding: 50px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
}

.footer-logo h3 {
    font-size: 1.5rem;
    color: var(--accent-color-2);
    margin-bottom: 10px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

.footer-links ul {
    display: flex;
    gap: 20px;
}

.footer-links ul li a {
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links ul li a:hover {
    opacity: 1;
    color: var(--accent-color-2);
}

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

.footer-bottom p {
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Responsive design */
@media (max-width: 992px) {
    .about-content, .contact-content {
        flex-direction: column;
    }
    
    .service-cards {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
    
    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 20px;
    }
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
    }
    
    nav {
        margin-top: 20px;
    }
    
    nav ul li {
        margin-left: 15px;
    }
    
    .hero h2 {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 576px) {
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
}