/* ===== UUAN English - Nous Research Layout Clone ===== */

/* ===== 浅色蓝调主题变量 ===== */
:root {
    --en-bg-primary: #f8fafc;
    --en-bg-elevated: #f1f5f9;
    --en-bg-card: #ffffff;
    --en-bg-card-hover: #f8fafc;
    --en-border-default: #bfdbfe;
    --en-border-hover: #93c5fd;
    --en-border-active: #3b82f6;
    --en-text-primary: #1e3a5f;
    --en-text-secondary: #3b82f6;
    --en-text-tertiary: #64748b;
    --en-text-muted: #94a3b8;
    --en-accent: #2563eb;
    --en-accent-light: #dbeafe;
    --en-accent-dim: rgba(37, 99, 235, 0.06);
    --en-radius-sm: 4px;
    --en-radius-md: 8px;
    --en-radius-lg: 12px;
    --en-transition-fast: 0.15s ease;
    --en-transition-base: 0.2s ease;
}

/* ===== Body 背景 ===== */
body.en-active {
    background: var(--en-bg-primary) !important;
}

/* ===== 导航栏 - 网格分隔样式 ===== */
body.en-active .header {
    background: var(--en-bg-primary) !important;
    border-bottom: 1px solid var(--en-border-default);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

body.en-active .nav {
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    align-items: center;
    gap: 0;
}

body.en-active .logo {
    color: var(--en-accent);
    font-weight: 800;
    font-size: 1.4rem;
    letter-spacing: -0.03em;
    text-transform: uppercase;
    line-height: 1.1;
    padding-right: 32px;
    border-right: 1px solid var(--en-border-default);
}

body.en-active .nav-menu {
    display: flex;
    gap: 0;
    padding-left: 0;
}

body.en-active .nav-menu li {
    border-right: 1px solid var(--en-border-default);
}

body.en-active .nav-menu li:last-child {
    border-right: none;
}

body.en-active .nav-menu a {
    color: var(--en-accent);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 20px 24px;
    display: block;
    border-bottom: none;
}

body.en-active .nav-menu a:hover,
body.en-active .nav-menu a.active {
    color: var(--en-text-primary);
}

body.en-active .lang-switch {
    border-left: 1px solid var(--en-border-default);
    border-right: 1px solid var(--en-border-default);
    padding: 0 16px;
    margin: 0;
    height: 100%;
    display: flex;
    align-items: center;
}

body.en-active .lang-btn {
    color: var(--en-text-muted);
    font-size: 0.75rem;
    font-weight: 500;
}

body.en-active .lang-btn.active {
    color: var(--en-accent);
    background: var(--en-accent-dim);
}

/* ===== 移动端菜单 ===== */
body.en-active .nav-toggle-bar {
    background: var(--en-accent);
}

body.en-active .nav-menu.active {
    background: var(--en-bg-primary);
    border-bottom: 1px solid var(--en-border-default);
}

/* ===== Hero 区域 ===== */
body.en-active .uuan-hero {
    background: var(--en-bg-primary);
    border-bottom: 1px solid var(--en-border-default);
    padding: 100px 0 60px;
    text-align: center;
}

body.en-active .uuan-hero-content {
    max-width: 600px;
    margin: 0 auto;
}

body.en-active .uuan-hero-brand {
    display: none;
}

body.en-active .uuan-hero-content > p {
    display: none;
}

body.en-active .uuan-hero .uuan-btn {
    display: none;
}

/* ===== 通用区块 ===== */
body.en-active .uuan-section {
    padding: 60px 0;
}

body.en-active .uuan-bg-light {
    background: var(--en-bg-elevated);
    border-top: 1px solid var(--en-border-default);
    border-bottom: 1px solid var(--en-border-default);
}

body.en-active .uuan-section-title {
    color: var(--en-accent);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 16px;
    text-align: center;
}

/* ===== 关于我们 ===== */
body.en-active #about .uuan-about-grid {
    display: block;
    text-align: center;
}

body.en-active #about .uuan-about-text {
    max-width: 640px;
    margin: 0 auto 40px;
}

body.en-active .uuan-about-text p {
    color: var(--en-text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 16px;
}

body.en-active .uuan-about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    max-width: 800px;
    margin: 0 auto;
}

body.en-active .uuan-stat-card {
    background: var(--en-bg-card);
    border: 1px solid var(--en-border-default);
    border-radius: var(--en-radius-md);
    padding: 24px 16px;
}

body.en-active .uuan-stat-card:hover {
    border-color: var(--en-border-hover);
}

body.en-active .uuan-stat-number {
    color: var(--en-accent);
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 4px;
}

body.en-active .uuan-stat-label {
    color: var(--en-text-tertiary);
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

/* ===== 服务领域 - 4列卡片 ===== */
body.en-active .uuan-services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

body.en-active .uuan-service-card {
    background: var(--en-bg-card);
    border: 1px solid var(--en-border-default);
    border-radius: var(--en-radius-md);
    padding: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

body.en-active .uuan-service-card:hover {
    border-color: var(--en-border-hover);
}

body.en-active .uuan-service-icon {
    font-size: 2.5rem;
    padding: 32px 28px 16px;
    margin: 0;
    display: block;
    opacity: 0.7;
    background: linear-gradient(135deg, var(--en-accent-light) 0%, var(--en-bg-elevated) 100%);
}

body.en-active .uuan-service-card h3 {
    color: var(--en-text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    padding: 0 28px;
    margin: 16px 0 8px;
}

body.en-active .uuan-service-card p {
    color: var(--en-text-tertiary);
    font-size: 0.85rem;
    line-height: 1.6;
    padding: 0 28px 28px;
    flex-grow: 1;
}

/* ===== 核心优势 ===== */
body.en-active .uuan-advantage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

body.en-active .uuan-advantage-item {
    background: var(--en-bg-card);
    border: 1px solid var(--en-border-default);
    border-radius: var(--en-radius-md);
    padding: 28px;
    text-align: center;
}

body.en-active .uuan-advantage-item:hover {
    border-color: var(--en-border-hover);
}

body.en-active .uuan-advantage-number {
    color: var(--en-accent);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: 0.1em;
}

body.en-active .uuan-advantage-item h3 {
    color: var(--en-text-primary);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

body.en-active .uuan-advantage-item p {
    color: var(--en-text-tertiary);
    font-size: 0.8rem;
    line-height: 1.5;
}

/* ===== 联系我们 ===== */
body.en-active .uuan-contact-grid {
    display: flex;
    justify-content: center;
}

body.en-active .uuan-contact-form {
    background: var(--en-bg-card);
    border: 1px solid var(--en-border-default);
    border-radius: var(--en-radius-md);
    padding: 40px;
    width: 100%;
    max-width: 480px;
}

body.en-active .uuan-contact-form h3 {
    color: var(--en-accent);
    font-size: 0.85rem;
    letter-spacing: 0.15em;
    text-align: center;
    margin-bottom: 28px;
}

body.en-active .uuan-form-group input,
body.en-active .uuan-form-group textarea {
    background: var(--en-bg-elevated);
    border: 1px solid var(--en-border-default);
    border-radius: var(--en-radius-sm);
    color: var(--en-text-primary);
    padding: 14px 16px;
    font-size: 0.9rem;
}

body.en-active .uuan-form-group input:focus,
body.en-active .uuan-form-group textarea:focus {
    border-color: var(--en-accent);
    background: var(--en-bg-card);
    box-shadow: 0 0 0 3px var(--en-accent-dim);
}

/* ===== 页脚 - 底部信息栏 ===== */
body.en-active .footer {
    background: var(--en-bg-primary);
    border-top: 1px solid var(--en-border-default);
    padding: 24px 0;
}

body.en-active .footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

body.en-active .footer-email {
    color: var(--en-text-tertiary);
    font-size: 0.8rem;
    margin: 0;
}

body.en-active .footer-email a:hover {
    color: var(--en-accent);
}

body.en-active .footer-copyright {
    color: var(--en-text-muted);
    font-size: 0.75rem;
    margin: 0;
    display: inline;
}

body.en-active .footer-icp {
    color: var(--en-text-muted);
    font-size: 0.75rem;
    margin: 0;
    display: inline;
}

body.en-active .footer-copyright::after {
    content: ' · ';
    color: var(--en-text-muted);
}

/* ===== 响应式 - 平板 ===== */
@media (max-width: 992px) {
    body.en-active .uuan-services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    body.en-active .uuan-advantage-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    body.en-active .uuan-about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===== 响应式 - 手机 ===== */
@media (max-width: 768px) {
    body.en-active .nav {
        grid-template-columns: 1fr auto auto;
    }

    body.en-active .logo {
        border-right: none;
        padding-right: 0;
    }

    body.en-active .nav-menu {
        display: none;
    }

    body.en-active .nav-menu.active {
        display: flex;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--en-bg-primary);
        border-bottom: 1px solid var(--en-border-default);
    }

    body.en-active .nav-menu li {
        border-right: none;
        border-bottom: 1px solid var(--en-border-default);
        width: 100%;
    }

    body.en-active .nav-menu li:last-child {
        border-bottom: none;
    }

    body.en-active .uuan-hero {
        padding: 100px 20px 50px;
    }

    body.en-active .uuan-hero-brand h1 {
        font-size: 1.3rem;
    }

    body.en-active .uuan-section {
        padding: 48px 0;
    }

    body.en-active .footer .container {
        flex-direction: column;
        gap: 8px;
    }
}

@media (max-width: 576px) {
    body.en-active .uuan-services-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    body.en-active .uuan-advantage-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    body.en-active .uuan-service-icon {
        padding: 24px 24px 12px;
    }

    body.en-active .uuan-service-card h3 {
        padding: 0 24px;
    }

    body.en-active .uuan-service-card p {
        padding: 0 24px 24px;
    }

    body.en-active .uuan-contact-form {
        padding: 28px 20px;
    }
}