/* ============================================
   数组云 ArrayCloud - 字节跳动风格
   极简白底、大量留白、现代简洁
   ============================================ */

:root {
    --color-primary: #000000;
    --color-secondary: #1a1a1a;
    --color-accent: #3370FF;
    
    --color-bg: #FFFFFF;
    --color-bg-alt: #F5F5F5;
    --color-bg-dark: #1a1a1a;
    
    --color-text: #1A1A1A;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    
    --color-border: #E5E5E5;
    --color-border-light: #F0F0F0;
    
    --font-main: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-en: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    --nav-height: 80px;
    --container-max: 1200px;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
    font-size: 16px;
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    outline: none;
    border: none;
    background: none;
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 40px;
}

@media (max-width: 768px) {
    .container {
        padding: 0 24px;
    }
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border-light);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

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

.logo-img {
    height: 48px;
    width: auto;
    border-radius: 4px;
}

.nav-links {
    display: flex;
    gap: 48px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-normal);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 10px;
    cursor: pointer;
    z-index: 1001;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: 32px 24px;
        gap: 0;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links li {
        border-bottom: 1px solid var(--color-border-light);
    }
    
    .nav-links li:last-child {
        border-bottom: none;
    }
    
    .nav-link {
        display: block;
        padding: 16px 0;
        font-size: 18px;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
    padding-bottom: 120px;
    position: relative;
    background: var(--color-bg);
}

.hero-content {
    width: 100%;
    max-width: 900px;
}

.hero-text {
    animation: fadeInUp 1s ease forwards;
}

.hero-title {
    margin-bottom: 40px;
}

.title-line {
    display: block;
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--color-primary);
}

.hero-subtitle {
    font-size: clamp(16px, 2.5vw, 20px);
    line-height: 1.8;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin-bottom: 48px;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    background: var(--color-primary);
    color: var(--color-bg);
    font-size: 15px;
    font-weight: 500;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.hero-cta:hover {
    background: var(--color-secondary);
    transform: translateY(-2px);
}

.hero-cta::after {
    content: '→';
    font-size: 18px;
    transition: transform var(--transition-fast);
}

.hero-cta:hover::after {
    transform: translateX(4px);
}

/* Scroll Indicator */
.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    animation: bounce 2s infinite;
}

.scroll-text {
    font-size: 12px;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-text-muted), transparent);
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* Section Common Styles */
section {
    padding: 120px 0;
}

@media (max-width: 768px) {
    section {
        padding: 80px 0;
    }
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.section-desc {
    font-size: 18px;
    color: var(--color-text-secondary);
}

/* Products Section */
.products {
    background: var(--color-bg-alt);
}

.products-grid {
    display: flex;
    flex-direction: column;
    gap: 60px;
}

.product-card {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: center;
    background: var(--color-bg);
    border-radius: 8px;
    padding: 60px;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

@media (max-width: 768px) {
    .product-card {
        grid-template-columns: 1fr;
        padding: 40px 32px;
        gap: 40px;
    }
}

.product-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.product-icon-large {
    width: 160px;
    height: 160px;
    color: var(--color-primary);
}

.product-icon-large svg {
    width: 100%;
    height: 100%;
}

.product-title {
    font-size: 32px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.product-name-en {
    font-family: var(--font-en);
    font-size: 14px;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 24px;
}

.product-desc {
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.product-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.product-features li {
    position: relative;
    padding-left: 20px;
    font-size: 15px;
    color: var(--color-text-secondary);
}

.product-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
}

/* About Section */
.about {
    background: var(--color-bg);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-intro {
    text-align: center;
    margin-bottom: 80px;
}

.about-text {
    font-size: 20px;
    line-height: 2;
    color: var(--color-text-secondary);
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    padding-top: 60px;
    border-top: 1px solid var(--color-border);
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }
}

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

.stat-number {
    display: block;
    font-size: 48px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
    font-family: var(--font-en);
}

.stat-label {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* Contact Section */
.contact {
    background: var(--color-bg-alt);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 80px;
    max-width: 1000px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 60px;
    }
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border-radius: 8px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.contact-detail {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.contact-label {
    font-size: 13px;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-value {
    font-size: 16px;
    color: var(--color-text);
    font-weight: 500;
}

/* Contact Form */
.contact-form-wrapper {
    background: var(--color-bg);
    padding: 48px;
    border-radius: 8px;
}

@media (max-width: 768px) {
    .contact-form-wrapper {
        padding: 32px;
    }
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 14px 16px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 15px;
    transition: border-color var(--transition-fast);
    background: var(--color-bg);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
}

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

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    padding: 16px 32px;
    background: var(--color-primary);
    color: var(--color-bg);
    font-size: 15px;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: 8px;
}

.form-submit:hover {
    background: var(--color-secondary);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background: var(--color-bg-dark);
    color: var(--color-bg);
    padding: 80px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 80px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-logo {
    height: 48px;
    width: auto;
    border-radius: 4px;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    max-width: 280px;
}

.footer-links {
    display: flex;
    gap: 80px;
}

@media (max-width: 768px) {
    .footer-links {
        gap: 48px;
    }
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--color-bg);
}

.footer-bottom {
    padding-top: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

@media (max-width: 768px) {
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
}

.footer-icp {
    font-size: 12px;
}