:root {
    --primary-color: #00d4ff;
    --secondary-color: #0080ff;
    --bg-primary: #0a0e27;
    --bg-secondary: #1a1f3a;
    --bg-tertiary: #2a2f4a;
    --text-primary: #ffffff;
    --text-secondary: #b0b8d4;
    --text-muted: #6b7280;
    --accent-color: #ff6b6b;
    --border-color: #2a2f4a;
    --border-light: #3a3f5a;
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #0080ff 100%);
    --gradient-secondary: linear-gradient(135deg, #ff6b6b 0%, #ff8e53 100%);
    --shadow-primary: rgba(0, 212, 255, 0.1);
    --shadow-secondary: rgba(0, 0, 0, 0.2);
    --glass-bg: rgba(10, 14, 39, 0.95);
}

[data-theme="light"] {
    --primary-color: #0080ff;
    --secondary-color: #0066cc;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --accent-color: #ef4444;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --gradient-primary: linear-gradient(135deg, #0080ff 0%, #0066cc 100%);
    --gradient-secondary: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    --shadow-primary: rgba(0, 128, 255, 0.1);
    --shadow-secondary: rgba(0, 0, 0, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.95);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.logo-text {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-subtext {
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

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

.nav-menu a.active::after {
    width: 100%;
}

.nav-menu a.active {
    color: var(--primary-color);
    font-weight: 600;
}

.theme-toggle {
    position: relative;
    margin-left: 1rem;
}

.theme-toggle-checkbox {
    display: none;
}

.theme-toggle-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 60px;
    height: 30px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 0 5px;
}

.theme-toggle-checkbox:checked + .theme-toggle-label {
    background: var(--gradient-primary);
    border-color: var(--primary-color);
}

.theme-icon {
    font-size: 14px;
    transition: all 0.3s ease;
}

.theme-icon.light {
    opacity: 1;
    transform: translateX(0);
}

.theme-icon.dark {
    opacity: 0.5;
    transform: translateX(0);
}

.theme-toggle-checkbox:checked + .theme-toggle-label .theme-icon.light {
    opacity: 0.5;
    transform: translateX(-2px);
}

.theme-toggle-checkbox:checked + .theme-toggle-label .theme-icon.dark {
    opacity: 1;
    transform: translateX(2px);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: all 0.3s ease;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%232a2f4a" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.1;
    transition: opacity 0.3s ease;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-family: 'Orbitron', monospace;
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.title-line {
    display: block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease forwards;
}

.title-line:nth-child(2) {
    animation-delay: 0.3s;
    opacity: 0;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 25px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--dark-bg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
}

.hero-visual {
    position: relative;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tech-grid {
    width: 300px;
    height: 300px;
    background: rgba(0, 212, 255, 0.1);
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    position: relative;
    animation: rotate 20s linear infinite;
}

.tech-grid::before,
.tech-grid::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
}

.tech-grid::before {
    width: 200px;
    height: 200px;
    border: 2px solid var(--secondary-color);
    animation: rotate 15s linear reverse infinite;
}

.tech-grid::after {
    width: 100px;
    height: 100px;
    background: var(--gradient-primary);
    animation: pulse 2s ease-in-out infinite;
}

.about {
    padding: 8rem 0;
    background: var(--bg-secondary);
    transition: background-color 0.3s ease;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-family: 'Orbitron', monospace;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.stat {
    text-align: center;
    padding: 1.5rem;
    background: rgba(0, 212, 255, 0.05);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.stat h3 {
    font-family: 'Orbitron', monospace;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

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

.about-visual {
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tech-shape {
    width: 300px;
    height: 300px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    animation: float 6s ease-in-out infinite;
}

.products {
    padding: 8rem 0;
    background: var(--bg-primary);
    transition: background-color 0.3s ease;
    position: relative;
}

.products::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 80% 50%, rgba(0, 128, 255, 0.05) 0%, transparent 50%);
    z-index: 1;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    position: relative;
    z-index: 2;
}

.product-card {
    background: var(--bg-secondary);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.product-card:hover::before {
    transform: scaleX(1);
}

.product-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--primary-color);
    box-shadow: 0 25px 50px rgba(0, 212, 255, 0.15);
}

.product-card.active {
    border-color: var(--primary-color);
    border-width: 2px;
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.2), 
                0 10px 30px rgba(0, 212, 255, 0.15);
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.08), rgba(0, 128, 255, 0.05));
    transform: translateY(-5px) scale(1.02);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.product-card.active .product-title {
    color: var(--secondary-color);
    background: rgba(0, 128, 255, 0.15);
}

.product-card.active .product-title a {
    color: var(--secondary-color);
    font-weight: 800;
}

.product-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease;
}

.product-card:hover .product-icon {
    transform: scale(1.1) rotate(5deg);
}

.product-title {
    font-family: 'Orbitron', monospace;
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    color: var(--primary-color);
    line-height: 1.3;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
    padding: 8px 16px;
    border-radius: 12px;
    position: relative;
}

.product-title:hover {
    background: rgba(0, 212, 255, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.2);
}

.product-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

.product-title:hover::after {
    width: 80%;
}

/* 统一标题链接样式 */
.product-title a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.4rem;
    font-family: 'Orbitron', monospace;
    display: inline-block;
    transition: all 0.3s ease;
    padding: 4px 8px;
    border-radius: 8px;
}

.product-title a:hover {
    color: var(--secondary-color);
    background: rgba(0, 128, 255, 0.1);
    transform: translateY(-1px);
    text-decoration: underline;
    text-underline-offset: 4px;
}

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



.footer {
    background: var(--bg-primary);
    padding: 5rem 0 2rem;
    border-top: 1px solid var(--border-color);
    transition: background-color 0.3s ease;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section {
    position: relative;
}

.footer-section h4 {
    font-family: 'Orbitron', monospace;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 0.5rem;
    text-align: left;
    letter-spacing: 0.5px;
}

.footer-section h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--gradient-primary);
}

.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-section ul li {
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.footer-section ul li:hover {
    transform: translateX(8px);
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
    display: block;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.4;
    position: relative;
    overflow: hidden;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
    background: rgba(0, 212, 255, 0.08);
    transform: translateX(4px);
    box-shadow: 0 2px 8px rgba(0, 212, 255, 0.15);
}

.footer-section ul li a.active {
    color: var(--primary-color);
    font-weight: 600;
    background: rgba(0, 212, 255, 0.15);
    padding: 8px 12px;
    border-radius: 8px;
    animation: pulse 2s infinite;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.footer-section ul li a::before {
    content: '▸';
    position: absolute;
    left: -8px;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
    font-size: 0.9rem;
    color: var(--primary-color);
}

.footer-section ul li a:hover::before {
    opacity: 1;
    left: 4px;
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-top: 1rem;
}

.footer-bottom {
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.footer-bottom p {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

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

.footer-bottom a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
}

.footer-bottom a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

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

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(0, 212, 255, 0.4);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(0, 212, 255, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(0, 212, 255, 0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes fadeOut {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.1);
        opacity: 0.8;
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
        border-top: 1px solid var(--border-color);
    }

    .nav-menu.active {
        display: flex;
    }

    .theme-toggle {
        margin-left: 0.5rem;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

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

    .hero-buttons {
        justify-content: center;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .about-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-section {
        text-align: center;
    }

    .footer-section h4 {
        text-align: center;
    }

    .footer-section h4::after {
        left: 50%;
        transform: translateX(-50%);
    }
}

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

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .section-header h2 {
        font-size: 1.8rem;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .footer {
        padding: 3rem 0 1.5rem;
    }

    .footer-content {
        gap: 1.5rem;
    }

    .footer-section h4 {
        font-size: 1rem;
        margin-bottom: 1rem;
    }

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

    .footer-section ul li a {
        font-size: 0.9rem;
        padding: 6px 10px;
    }

    .footer-bottom p {
        font-size: 0.85rem;
    }
}