/* ===== 基础变量 ===== */
:root {
    --primary: #0066ff;
    --primary-dark: #0050cc;
    --primary-light: #e6f0ff;
    --accent: #00d4aa;
    --dark: #0a0e27;
    --dark-2: #111638;
    --dark-3: #1a1f4a;
    --gray-100: #f4f6fc;
    --gray-200: #e2e6f0;
    --gray-300: #c0c6d9;
    --gray-400: #8890a8;
    --white: #ffffff;
    --font: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.12);
    --transition: 0.3s ease;
}

/* ===== Reset ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    color: #333;
    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;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 14, 39, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--white);
    letter-spacing: -0.5px;
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-links a {
    color: var(--gray-300);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--white);
    background: rgba(255, 255, 255, 0.08);
}

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

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 50%, #0d1a4a 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 212, 170, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

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

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1.15;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.hero-sub {
    font-size: 1.3rem;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--gray-300);
    max-width: 600px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero-note {
    display: inline-block;
    margin-bottom: 28px;
    padding: 8px 14px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 999px;
    color: var(--gray-300);
    font-size: 0.9rem;
    background: rgba(255, 255, 255, 0.04);
}

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

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 16px rgba(0, 102, 255, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0, 102, 255, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.25);
}

.btn-outline:hover {
    border-color: var(--white);
    background: rgba(255, 255, 255, 0.05);
}

.btn-full {
    width: 100%;
}

/* ===== 数据亮点 ===== */
.stats {
    background: var(--dark);
    padding: 60px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.stat-item {
    padding: 24px;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
}

.stat-unit {
    font-size: 1.3rem;
    color: var(--accent);
    font-weight: 600;
}

.stat-item p {
    color: var(--gray-400);
    margin-top: 8px;
    font-size: 0.95rem;
}

/* ===== 通用 Section 标题 ===== */
.section-title {
    text-align: center;
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.section-desc {
    text-align: center;
    color: var(--gray-400);
    font-size: 1.1rem;
    margin-bottom: 48px;
}

/* ===== 产品系列 ===== */
.products {
    padding: 100px 0;
    background: var(--gray-100);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.product-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px 32px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    border: 2px solid transparent;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.product-card.featured {
    border-color: var(--primary);
    box-shadow: 0 8px 32px rgba(0, 102, 255, 0.15);
}

.product-badge {
    position: absolute;
    top: -12px;
    right: 24px;
    background: var(--primary);
    color: var(--white);
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
}

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

.product-card h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.product-tag {
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.product-card ul {
    list-style: none;
    text-align: left;
    margin-bottom: 20px;
}

.product-card ul li {
    padding: 8px 0;
    border-bottom: 1px solid var(--gray-200);
    color: #555;
    font-size: 0.95rem;
    padding-left: 20px;
    position: relative;
}

.product-card ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
}

.product-use {
    font-size: 0.85rem;
    color: var(--gray-400);
    margin-bottom: 24px;
}

/* ===== 核心特性 ===== */
.features {
    padding: 100px 0;
    background: var(--white);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-item {
    padding: 36px 28px;
    border-radius: var(--radius);
    background: var(--gray-100);
    transition: var(--transition);
    border: 1px solid transparent;
}

.feature-item:hover {
    border-color: var(--primary);
    background: var(--primary-light);
    transform: translateY(-4px);
}

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

.feature-item h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.feature-item p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===== 技术规格 ===== */
.specs {
    padding: 100px 0;
    background: var(--dark);
    color: var(--white);
}

.specs .section-title {
    color: var(--white);
}

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--dark-2);
}

thead {
    background: var(--dark-3);
}

th, td {
    padding: 16px 24px;
    text-align: center;
    font-size: 0.95rem;
}

th {
    font-weight: 700;
    color: var(--gray-300);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
}

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

td {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    color: var(--gray-300);
}

tr td:first-child {
    text-align: left;
    font-weight: 600;
    color: var(--white);
}

tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

/* ===== 应用场景 ===== */
.applications {
    padding: 100px 0;
    background: var(--gray-100);
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.app-item {
    background: var(--white);
    padding: 36px 28px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.app-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

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

.app-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.app-item p {
    color: var(--gray-400);
    font-size: 0.9rem;
}

/* ===== 联系我们 ===== */
.contact {
    padding: 100px 0;
    background: var(--white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: start;
}

.contact-form {
    background: var(--gray-100);
    padding: 40px;
    border-radius: var(--radius);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

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

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: #444;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: var(--font);
    transition: var(--transition);
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

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

.info-card {
    background: var(--gray-100);
    padding: 24px;
    border-radius: var(--radius);
}

.info-card h3 {
    font-size: 1rem;
    margin-bottom: 8px;
}

.info-card p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--dark);
    color: var(--gray-400);
    padding: 64px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-about p {
    margin-top: 16px;
    font-size: 0.9rem;
    line-height: 1.7;
}

.footer-links h4 {
    color: var(--white);
    font-size: 1rem;
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    color: var(--gray-400);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 4px 0;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
}

/* ===== 动画 ===== */
.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: rgba(0, 212, 170, 0.4);
    border-radius: 50%;
    animation: float linear infinite;
}

@keyframes float {
    0% { transform: translateY(100vh) scale(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-100px) scale(1); opacity: 0; }
}

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

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

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .product-grid, .feature-grid, .app-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-toggle { display: block; }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--dark);
        padding: 16px 24px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .hero h1 { font-size: 2.2rem; }
    .hero-sub { font-size: 1rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .product-grid, .feature-grid, .app-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .stat-number { font-size: 2.2rem; }
    .section-title { font-size: 1.7rem; }
}