/* ===================================
   GAI Times - 企业官网样式
   =================================== */

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

:root {
    /* 配色 */
    --color-primary: #1a73e8;
    --color-secondary: #00c9a7;
    --color-bg-dark: #0f1724;
    --color-bg-secondary: #162033;
    --color-bg-card: #1a2744;
    --color-text-primary: #e8edf5;
    --color-text-secondary: #8899b4;
    --color-border: rgba(255, 255, 255, 0.1);
    
    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.6s ease;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* 间距 */
    --section-padding: 100px;
    --container-max-width: 1200px;
}

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

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

/* === 语言切换 === */
body:not(.lang-en) .lang-en {
    display: none;
}

body.lang-en .lang-zh {
    display: none;
}

/* === 容器 === */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* === 导航栏 === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all var(--transition-normal);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(15, 23, 36, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    text-decoration: none;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: width var(--transition-fast);
}

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

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

.lang-toggle {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.lang-toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    position: relative;
    transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: transform var(--transition-fast);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

.mobile-menu-btn.active .hamburger {
    background: transparent;
}

.mobile-menu-btn.active .hamburger::before {
    transform: rotate(45deg) translate(5px, 6px);
}

.mobile-menu-btn.active .hamburger::after {
    transform: rotate(-45deg) translate(5px, -6px);
}

/* === Hero 首屏 === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 24px;
    overflow: hidden;
}

/* Hero Canvas 动态背景 */
.hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    mix-blend-mode: screen;
}

/* 保留 hero-bg 作为 Canvas 之上的叠加层，增加层次感 */
.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 100% 60% at 50% -30%, rgba(26, 115, 232, 0.2), transparent),
        radial-gradient(ellipse 80% 50% at 80% 100%, rgba(0, 201, 167, 0.15), transparent),
        radial-gradient(ellipse 50% 40% at 10% 50%, rgba(26, 115, 232, 0.1), transparent);
    /* 注意：移除了 linear-gradient，不再铺深色底色 */
    opacity: 0.4;
    z-index: 1;
    pointer-events: none;
}

/* Hero 暗角效果，增加深度感 */
.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 70% 60% at 50% 50%, transparent 0%, rgba(0, 0, 0, 0.25) 100%);
    pointer-events: none;
    z-index: 1;
}

/* Hero 内容层确保在最上方 */
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--color-text-primary), var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.hero-slogan {
    font-size: 1.5rem;
    color: var(--color-text-primary);
    margin-bottom: 12px;
    font-weight: 500;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 20px rgba(26, 115, 232, 0.4);
}

.cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(26, 115, 232, 0.6);
}

.btn-arrow {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
}

.cta-btn:hover .btn-arrow {
    transform: translate(2px, -2px);
}

.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-text-secondary);
    border-radius: 12px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--color-text-secondary);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll-wheel 2s infinite;
}

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

@keyframes scroll-wheel {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(8px); }
}

/* === Section 通用 === */
.section {
    padding: var(--section-padding) 0;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: var(--color-text-primary);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    margin: 16px auto 0;
    border-radius: 2px;
}

.section-desc {
    text-align: center;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto 48px;
    font-size: 1.1rem;
    line-height: 1.8;
}

/* === 关于我们 === */
.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.value-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.value-card:hover {
    transform: translateY(-8px);
    border-color: rgba(26, 115, 232, 0.5);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.value-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    color: var(--color-primary);
}

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

.value-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--color-text-primary);
}

.value-desc {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* === 产品与服务 === */
.products {
    background: var(--color-bg-secondary);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.product-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.product-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 201, 167, 0.5);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.product-icon {
    width: 56px;
    height: 56px;
    margin-bottom: 20px;
    color: var(--color-secondary);
}

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

.product-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.product-name {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.product-status {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-live {
    background: rgba(0, 201, 167, 0.2);
    color: var(--color-secondary);
}

.status-soon {
    background: rgba(26, 115, 232, 0.2);
    color: var(--color-primary);
}

.status-planned {
    background: rgba(136, 153, 180, 0.2);
    color: var(--color-text-secondary);
}

.product-desc {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* === 技术优势 === */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.tech-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.tech-card:hover {
    transform: translateY(-4px);
    border-color: rgba(26, 115, 232, 0.5);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.2);
}

.tech-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    color: var(--color-primary);
}

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

.tech-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text-primary);
}

.tech-desc {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* === 联系我们 === */
.contact {
    background: var(--color-bg-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: 700px;
    margin: 48px auto 0;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    background: var(--color-bg-card);
    padding: 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.contact-item:hover {
    border-color: rgba(26, 115, 232, 0.5);
}

.contact-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    color: var(--color-primary);
}

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

.contact-info h4 {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
    font-weight: 500;
}

.contact-info a,
.contact-info p {
    color: var(--color-text-primary);
    font-size: 1rem;
    margin: 0;
}

.contact-info a {
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-info a:hover {
    color: var(--color-primary);
}

/* === Footer === */
.footer {
    background: var(--color-bg-dark);
    padding: 48px 0 32px;
    border-top: 1px solid var(--color-border);
}

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

.footer-brand {
    margin-bottom: 24px;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-tagline {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-top: 8px;
}

.footer-links {
    margin-bottom: 24px;
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

.footer-links .divider {
    color: var(--color-text-secondary);
    margin: 0 16px;
}

.footer-bottom {
    color: var(--color-text-secondary);
    font-size: 0.8rem;
}

.footer-bottom p {
    margin: 4px 0;
}

.icp {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--color-border);
    font-size: 0.85rem;
}

.icp a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.icp::before {
    content: '';
    display: inline-block;
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238899b4' stroke-width='2'%3E%3Cpath d='M12 2L2 7v10c0 5.5 4 10 10 12 6-2 10-6.5 10-12V7L12 2z'/%3E%3Cpath d='M8 12l3 3 5-5'/%3E%3C/svg%3E") center/contain no-repeat;
}

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

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

/* === 响应式 === */
@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }
    
    .values-grid,
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tech-grid {
        gap: 24px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }
    
    /* 导航 */
    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        background: rgba(15, 23, 36, 0.98);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-links.active {
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links a {
        font-size: 1.25rem;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .lang-toggle {
        position: fixed;
        top: 20px;
        right: 80px;
        z-index: 1001;
    }
    
    /* Hero */
    /* Hero Canvas 移动端降低强度 */
    .hero-canvas {
        opacity: 0.7;
    }

    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-slogan {
        font-size: 1.125rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    /* Section 标题 */
    .section-title {
        font-size: 1.75rem;
    }
    
    .section-desc {
        font-size: 1rem;
    }
    
    /* 网格布局 */
    .values-grid,
    .products-grid,
    .tech-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    /* 卡片 */
    .value-card,
    .product-card,
    .tech-card {
        padding: 32px 24px;
    }
    
    .product-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    /* Footer */
    .footer-links .divider {
        display: none;
    }
    
    .footer-links {
        display: flex;
        flex-direction: column;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .cta-btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
    
    .scroll-indicator {
        display: none;
    }
}

/* === 无障碍 === */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
    
    .fade-in {
        opacity: 1;
        transform: none;
    }

    .hero-canvas {
        display: none;
    }
}

/* === Focus 样式 === */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}