/* 全局重置与基础变量 */
:root {
    --black-primary: #0a0a0a;
    --black-secondary: #121212;
    --black-tertiary: #1a1a1a;
    --white-primary: #ffffff;
    --white-secondary: #f0f0f0;
    --accent-color: #8a2be2; /* 紫色强调色（科技感） */
    --accent-hover: #a45deb;
    --font-main: 'Inter', 'Roboto', sans-serif;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-main);
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--black-primary);
    color: var(--white-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white-primary);
    text-decoration: none;
}

.navbar-logo i {
    color: var(--accent-color);
}

.navbar-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.navbar-links a {
    color: var(--white-secondary);
    text-decoration: none;
    font-size: 1rem;
    transition: var(--transition);
}

.navbar-links a:hover {
    color: var(--accent-color);
}

.navbar-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--white-primary);
    cursor: pointer;
}

/* 首屏英雄区域 */
.hero-section {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(138, 43, 226, 0.1), rgba(10, 10, 10, 0.9));
    z-index: -1;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    padding: 0 2rem;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

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

.highlight::after {
    content: '';
    position: absolute;
    bottom: 0.2rem;
    left: 0;
    width: 100%;
    height: 0.3rem;
    background: var(--accent-color);
    opacity: 0.3;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--white-secondary);
    margin-bottom: 2.5rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(138, 43, 226, 0.3);
}

.btn-secondary {
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
}

.btn-secondary:hover {
    background: rgba(138, 43, 226, 0.1);
    transform: translateY(-2px);
}

/* 技术模块 */
.tech-section {
    padding: 8rem 0;
    background: var(--black-secondary);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--accent-color);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.tech-card {
    background: var(--black-tertiary);
    padding: 2.5rem 2rem;
    border-radius: 8px;
    text-align: center;
    transition: var(--transition);
}

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

.tech-icon {
    font-size: 3.5rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

.tech-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.tech-card p {
    color: var(--white-secondary);
    font-size: 1rem;
}

/* 页脚 */
.footer {
    background: var(--black-tertiary);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-col h4 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--white-primary);
}

.footer-col p {
    color: var(--white-secondary);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

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

.footer-col ul li {
    margin-bottom: 0.8rem;
}

.footer-col ul li a {
    color: var(--white-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--white-secondary);
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--black-primary);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 2rem;
        transition: var(--transition);
    }

    .navbar-links.active {
        left: 0;
    }

    .navbar-toggle {
        display: block;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

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