/* CSS Custom Properties */
:root {
    /* Color Scheme */
    --primary-color: #8A2BE2; /* 光谱紫 */
    --cta-color: #00FFF0; /* 霓虹青 */
    --dark-base: #121212; /* 纯黑带颗粒纹理 */
    --card-color: #1E1E28; /* 紫黑渐变 */
    --divider-color: #512FA0; /* 紫晶色 */
    --text-primary: #FFFFFF; /* 纯白 */
    --text-secondary: #B0A3D6; /* 薰衣草灰 */
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    
    /* Spacing */
    --container-max-width: 1200px;
    --section-padding: 80px 0;
    --card-padding: 30px;
    
    /* Transitions */
    --transition-fast: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-card: 0 10px 30px rgba(138, 43, 226, 0.2);
    --shadow-hover: 0 20px 40px rgba(138, 43, 226, 0.3);
    --glow-effect: 0 0 20px rgba(0, 255, 240, 0.5);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background: var(--dark-base);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(138, 43, 226, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(0, 255, 240, 0.05) 0%, transparent 50%);
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(18, 18, 18, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--divider-color);
    z-index: 1000;
    transition: var(--transition-fast);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-logo i {
    font-size: 1.8rem;
    color: var(--cta-color);
    text-shadow: var(--glow-effect);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

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

.nav-link:hover {
    color: var(--text-primary);
    text-shadow: 0 0 10px rgba(0, 255, 240, 0.3);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--cta-color));
    transition: var(--transition-fast);
}

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

.cta-nav {
    background: linear-gradient(135deg, var(--primary-color), var(--cta-color));
    color: var(--text-primary) !important;
    padding: 10px 20px;
    border-radius: 25px;
    box-shadow: var(--glow-effect);
    transition: var(--transition-fast);
}

.cta-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 255, 240, 0.7);
}

.cta-nav::after {
    display: none;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px 0 80px;
    background: linear-gradient(135deg, rgba(18, 18, 18, 0.9), rgba(30, 30, 40, 0.9)),
                url('images/hero-image.png') center/cover;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, transparent 0%, rgba(18, 18, 18, 0.7) 100%);
}

.hero-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--text-primary), var(--cta-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(0, 255, 240, 0.3);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.6;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 40px;
}

.feature-tag {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(30, 30, 40, 0.8);
    padding: 10px 15px;
    border-radius: 20px;
    border: 1px solid var(--divider-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.feature-tag i {
    color: var(--cta-color);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--cta-color));
    color: var(--text-primary);
    text-decoration: none;
    padding: 18px 35px;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: bold;
    box-shadow: var(--glow-effect);
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-slow);
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 40px rgba(0, 255, 240, 0.8);
}

.hero-image {
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: var(--shadow-card);
    transition: var(--transition-slow);
}

.hero-image img:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-hover);
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--text-primary), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Features Section */
.features {
    padding: var(--section-padding);
    background: linear-gradient(180deg, var(--dark-base), rgba(30, 30, 40, 0.5));
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.feature-card {
    background: var(--card-color);
    padding: var(--card-padding);
    border-radius: 20px;
    border: 1px solid var(--divider-color);
    box-shadow: var(--shadow-card);
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--cta-color));
}

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

.feature-icon {
    margin-bottom: 20px;
    text-align: center;
}

.feature-icon img {
    width: 80px;
    height: 80px;
    border-radius: 15px;
    object-fit: cover;
    box-shadow: 0 5px 15px rgba(138, 43, 226, 0.3);
}

.feature-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.feature-list i {
    color: var(--cta-color);
    font-size: 0.8rem;
}

/* About Section */
.about {
    padding: var(--section-padding);
}

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

.about-description {
    margin-bottom: 30px;
}

.about-description p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

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

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

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--cta-color);
    text-shadow: var(--glow-effect);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 5px;
}

.about-image img {
    width: 100%;
    border-radius: 20px;
    box-shadow: var(--shadow-card);
}

/* Advantages Section */
.advantages {
    padding: var(--section-padding);
    background: linear-gradient(180deg, rgba(30, 30, 40, 0.3), var(--dark-base));
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.advantage-item {
    background: var(--card-color);
    padding: 30px;
    border-radius: 15px;
    border: 1px solid var(--divider-color);
    text-align: center;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.advantage-item::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(138, 43, 226, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: var(--transition-fast);
}

.advantage-item:hover::before {
    opacity: 1;
}

.advantage-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.advantage-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--cta-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: var(--glow-effect);
}

.advantage-icon i {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.advantage-item h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.advantage-item p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* FAQ Section */
.faq {
    padding: var(--section-padding);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--card-color);
    border: 1px solid var(--divider-color);
    border-radius: 15px;
    margin-bottom: 20px;
    overflow: hidden;
    transition: var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--primary-color);
}

.faq-question {
    padding: 25px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

.faq-question:hover {
    background: rgba(138, 43, 226, 0.1);
}

.faq-question h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin: 0;
}

.faq-question i {
    color: var(--cta-color);
    transition: var(--transition-fast);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-fast);
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 25px 25px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* Footer */
.footer {
    background: linear-gradient(180deg, var(--dark-base), #0a0a0a);
    padding: 60px 0 20px;
    border-top: 1px solid var(--divider-color);
}

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

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.1rem;
}

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

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

.footer-section ul li,
.footer-section p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.footer-logo i {
    color: var(--cta-color);
    text-shadow: var(--glow-effect);
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.contact-info i {
    color: var(--cta-color);
    width: 16px;
}

.footer-bottom {
    border-top: 1px solid var(--divider-color);
    padding-top: 30px;
    text-align: center;
}

.footer-keywords {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.footer-keywords span {
    background: rgba(30, 30, 40, 0.8);
    color: var(--text-secondary);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    border: 1px solid var(--divider-color);
}

.footer-bottom p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 991px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-stats {
        justify-content: center;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: rgba(18, 18, 18, 0.98);
        width: 100%;
        text-align: center;
        transition: var(--transition-fast);
        padding: 30px 0;
        border-top: 1px solid var(--divider-color);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-keywords {
        gap: 10px;
    }
    
    .footer-keywords span {
        font-size: 0.75rem;
        padding: 4px 10px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 80px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .feature-card,
    .advantage-item {
        padding: 20px;
    }
    
    .hero-features {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-button {
        padding: 15px 25px;
        font-size: 1rem;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Scroll Animations */
@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 20px rgba(0, 255, 240, 0.5);
    }
    50% {
        box-shadow: 0 0 40px rgba(0, 255, 240, 0.8);
    }
}

.pulse-animation {
    animation: pulse 2s infinite;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--dark-base);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary-color), var(--cta-color));
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--cta-color), var(--primary-color));
}