/* ===== 全局变量 ===== */
:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary: #0ea5e9;
    --accent: #06b6d4;
    --dark: #0f172a;
    --dark-2: #1e293b;
    --gray: #64748b;
    --light-gray: #e2e8f0;
    --bg-light: #f8fafc;
    --bg-alt: #f1f5f9;
    --white: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --gradient: linear-gradient(135deg, #2563eb 0%, #0ea5e9 100%);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px -3px rgba(0,0,0,0.15), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 50px -10px rgba(0,0,0,0.2);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s ease;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

.btn-primary {
    background: var(--gradient);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--white);
}

.btn-full {
    width: 100%;
    text-align: center;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 18px 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 12px 0;
    box-shadow: var(--shadow);
    border-bottom-color: var(--light-gray);
}

.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: 8px;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--dark);
}

.logo-icon {
    font-size: 1.6rem;
}

.logo-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--dark-2);
    border-radius: 8px;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.08);
}

.nav-link.active {
    color: var(--primary);
    background: rgba(37, 99, 235, 0.1);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-dark);
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(37, 99, 235, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(14, 165, 233, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 50% 80%, rgba(6, 182, 212, 0.15) 0%, transparent 50%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 24px;
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 32px;
}

.hero-tags {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.tag {
    padding: 6px 18px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(5px);
}

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

.scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
    cursor: pointer;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    margin: 8px auto 0;
    border-left: 2px solid rgba(255, 255, 255, 0.4);
    border-bottom: 2px solid rgba(255, 255, 255, 0.4);
    transform: rotate(-45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: rotate(-45deg) translate(0, 0); }
    50% { transform: rotate(-45deg) translate(-4px, -4px); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== 数据统计 ===== */
.stats {
    padding: 60px 0;
    background: var(--white);
    border-bottom: 1px solid var(--light-gray);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 24px;
}

.stat-number, .stat-text {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-number::after {
    content: '+';
}

.stat-label {
    color: var(--text-light);
    font-size: 1rem;
}

/* ===== 通用 Section ===== */
.section {
    padding: 100px 0;
}

.section-alt {
    background: var(--bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 12px;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gradient);
    margin: 16px auto 0;
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.15rem;
    color: var(--text-light);
}

/* ===== About ===== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-text h3 {
    font-size: 1.6rem;
    color: var(--dark);
    margin-bottom: 16px;
}

.about-text p {
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 32px;
}

.feature {
    padding: 20px;
    border-radius: var(--radius);
    background: var(--bg-light);
    border: 1px solid var(--light-gray);
    transition: var(--transition);
}

.feature:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.feature h4 {
    font-size: 1.05rem;
    color: var(--dark);
    margin-bottom: 4px;
}

.feature p {
    font-size: 0.85rem;
    color: var(--text-light);
    margin: 0;
}

/* Code Card */
.image-card {
    background: var(--dark);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.card-header {
    padding: 12px 16px;
    background: var(--dark-2);
    display: flex;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #22c55e; }

.card-body {
    padding: 24px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.8;
}

.code-line { color: #94a3b8; }
.code-line.indent { padding-left: 24px; }
.code-line.indent2 { padding-left: 48px; }
.code-keyword { color: #c084fc; }
.code-var { color: #60a5fa; }
.code-string { color: #4ade80; }
.code-number { color: #fbbf24; }

/* ===== Services ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid transparent;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.service-card h3 {
    font-size: 1.3rem;
    color: var(--dark);
    margin-bottom: 8px;
}

.service-card > p {
    color: var(--text-light);
    margin-bottom: 16px;
    font-size: 0.95rem;
}

.service-list {
    padding-top: 16px;
    border-top: 1px solid var(--light-gray);
}

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

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

/* ===== Products ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.product-card {
    position: relative;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    overflow: hidden;
}

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

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

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

.product-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    background: var(--gradient);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 50px;
}

.product-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.product-card h3 {
    font-size: 1.4rem;
    color: var(--dark);
    margin-bottom: 8px;
}

.product-card p {
    color: var(--text-light);
    margin-bottom: 16px;
}

.product-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.product-tags span {
    padding: 4px 12px;
    background: var(--bg-alt);
    color: var(--primary);
    font-size: 0.8rem;
    border-radius: 6px;
    font-weight: 500;
}

/* ===== Team ===== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.team-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 24px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.team-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.avatar {
    width: 80px;
    height: 80px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--white);
}

.team-card h3 {
    font-size: 1.2rem;
    color: var(--dark);
    margin-bottom: 4px;
}

.team-role {
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.team-desc {
    color: var(--text-light);
    font-size: 0.85rem;
}

/* ===== Contact ===== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    align-items: flex-start;
}

.contact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-alt);
    border-radius: 12px;
}

.contact-item h4 {
    color: var(--dark);
    font-size: 1rem;
    margin-bottom: 4px;
}

.contact-item p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.contact-form-wrapper {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--light-gray);
}

.contact-form h3 {
    font-size: 1.4rem;
    color: var(--dark);
    margin-bottom: 24px;
}

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

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--light-gray);
    border-radius: 8px;
    font-size: 0.95rem;
    color: var(--text);
    transition: var(--transition);
    outline: none;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-tip {
    text-align: center;
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--primary);
    min-height: 20px;
}

/* ===== Footer ===== */
.footer {
    background: var(--dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 0.9rem;
    line-height: 1.7;
    max-width: 300px;
}

.footer-col h4 {
    color: var(--white);
    font-size: 1.05rem;
    margin-bottom: 16px;
}

.footer-col ul li {
    margin-bottom: 8px;
}

.footer-col ul li a {
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 0;
    text-align: center;
    font-size: 0.85rem;
}

/* ===== 动画 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .products-grid { grid-template-columns: 1fr; }
    .team-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--white);
        padding: 16px;
        gap: 4px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .hamburger { display: flex; }

    .hero-title { font-size: 2rem; }
    .hero-subtitle { font-size: 1.1rem; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-number { font-size: 2.2rem; }

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }

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

    .services-grid { grid-template-columns: 1fr; }
    .team-grid { grid-template-columns: 1fr 1fr; }
    .footer-content { grid-template-columns: 1fr; }

    .section { padding: 64px 0; }
    .section-title { font-size: 1.8rem; }
}