/* ===== 变量与基础 ===== */
:root {
    --color-bg: #0a0e17;
    --color-bg-card: #121a2a;
    --color-primary: #00d4ff;
    --color-primary-dim: rgba(0, 212, 255, 0.15);
    --color-accent: #7c3aed;
    --color-text: #e2e8f0;
    --color-text-muted: #94a3b8;
    --color-border: rgba(148, 163, 184, 0.15);
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Noto Sans SC', sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background: rgba(10, 14, 23, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 12px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-text);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

.nav-links a:hover {
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
}

/* ===== 主视觉区 ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    padding: 120px 24px 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% 0%, var(--color-primary-dim) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(124, 58, 237, 0.1) 0%, transparent 40%);
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
}

.hero-tag {
    font-family: var(--font-display);
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero .highlight {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    margin-bottom: 40px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), #0099cc);
    color: var(--color-bg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.35);
}

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

.btn-outline:hover {
    background: var(--color-primary-dim);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--color-primary);
    border-bottom: 2px solid var(--color-primary);
    transform: rotate(45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: rotate(45deg) translateY(0); }
    50% { transform: rotate(45deg) translateY(6px); }
}

/* ===== 通用区块标题 ===== */
.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-header.light .section-tag,
.section-header.light h2 {
    color: var(--color-text);
}

.section-tag {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 12px;
}

.section-header p {
    color: var(--color-text-muted);
    max-width: 560px;
    margin: 0 auto;
}

/* ===== 产品展示 ===== */
.products {
    padding: 100px 0;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.product-card {
    background: var(--color-bg-card);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 212, 255, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.product-image {
    position: relative;
    height: 200px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(124, 58, 237, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-placeholder {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    opacity: 0.9;
}

.product-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--color-primary);
    color: var(--color-bg);
    font-size: 0.75rem;
    padding: 4px 12px;
    border-radius: 20px;
}

.product-info {
    padding: 24px;
}

.product-info h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.product-info > p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.product-specs {
    list-style: none;
    margin-bottom: 20px;
}

.product-specs li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.product-specs li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

.product-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
}

.product-link:hover {
    color: var(--color-text);
}

/* ===== 核心特性 ===== */
.features {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-card) 50%, var(--color-bg) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 32px;
}

.feature-item {
    text-align: center;
    padding: 32px 24px;
    background: rgba(10, 14, 23, 0.6);
    border-radius: 16px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.feature-item:hover {
    border-color: rgba(0, 212, 255, 0.3);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.feature-item h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.feature-item p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ===== 应用场景 ===== */
.applications {
    padding: 100px 0;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.app-card {
    padding: 32px;
    background: var(--color-bg-card);
    border-radius: 16px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.app-card:hover {
    border-color: rgba(124, 58, 237, 0.4);
    box-shadow: 0 12px 32px rgba(124, 58, 237, 0.15);
}

.app-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.app-card h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.app-card p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ===== 联系我们 ===== */
.contact {
    padding: 100px 0;
}

.contact-wrapper {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.contact-info h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    margin-bottom: 12px;
}

.contact-info > p {
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

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

.contact-list li {
    padding: 12px 0;
    color: var(--color-text-muted);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-form input,
.contact-form textarea {
    padding: 14px 18px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--color-text-muted);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.contact-form textarea {
    resize: vertical;
    min-height: 100px;
}

/* ===== 页脚 ===== */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-display);
    font-weight: 600;
}

.footer-brand .logo-icon {
    color: var(--color-primary);
}

.footer-copy {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .product-grid {
        grid-template-columns: 1fr;
    }

    .section-header {
        margin-bottom: 40px;
    }
}