/* 爱卡云 - 极点云风格设计系统 v2.0 */
:root {
    --primary: #0052d9;
    --primary-dark: #002ab1;
    --primary-light: #1466ed;
    --primary-gradient: linear-gradient(135deg, #002ab1 0%, #0052d9 50%, #1466ed 100%);
    --secondary: #6c63e8;
    --accent: #51d4ff;
    --success: #00b42a;
    --warning: #ff7d00;
    --danger: #f53f3f;
    --bg-light: #f5f7fa;
    --bg-white: #ffffff;
    --bg-dark: #1a1a2e;
    --text-primary: #1d2129;
    --text-secondary: #4e5969;
    --text-light: #86909c;
    --text-white: #ffffff;
    --border-color: #e5e6eb;
    --border-light: #f2f3f5;
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --shadow-primary: 0 4px 16px rgba(0,82,217,0.25);
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.container-fluid { width: 100%; padding: 0 24px; }

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    outline: none;
    white-space: nowrap;
    user-select: none;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-primary);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,82,217,0.35);
    color: white;
}
.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: white;
}
.btn-white {
    background: white;
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}
.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: var(--primary);
}
.btn-ghost {
    background: rgba(255,255,255,0.15);
    color: white;
    border-color: rgba(255,255,255,0.4);
    backdrop-filter: blur(10px);
}
.btn-ghost:hover {
    background: white;
    color: var(--primary);
}
.btn-lg { padding: 14px 36px; font-size: 16px; }
.btn-sm { padding: 6px 16px; font-size: 13px; }
.btn-block { width: 100%; }

/* 卡片 */
.card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: hidden;
    border: 1px solid var(--border-light);
}
.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: rgba(0,82,217,0.2);
}
.card-body { padding: 24px; }

/* 顶部导航 */
.aikayun-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    transition: var(--transition);
}
.aikayun-header.scrolled {
    background: rgba(255,255,255,0.95);
    box-shadow: var(--shadow-sm);
}
.aikayun-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}
.aikayun-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.aikayun-logo img { height: 40px; }
.aikayun-menu {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}
.aikayun-menu > li { position: relative; }
.aikayun-menu > li > a {
    display: block;
    padding: 10px 18px;
    font-size: 15px;
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: var(--transition-fast);
}
.aikayun-menu > li > a:hover,
.aikayun-menu > li > a.active {
    color: var(--primary);
    background: rgba(0,82,217,0.08);
}
.aikayun-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}
.aikayun-menu > li:hover .aikayun-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.aikayun-dropdown a {
    display: block;
    padding: 10px 16px;
    font-size: 14px;
    color: var(--text-secondary);
    border-radius: var(--radius-xs);
}
.aikayun-dropdown a:hover {
    background: var(--bg-light);
    color: var(--primary);
}
.aikayun-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}
.aikayun-actions .btn { padding: 8px 20px; font-size: 14px; }
.aikayun-user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}
.aikayun-user-info:hover { background: var(--bg-light); }
.aikayun-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 14px;
    font-weight: 600;
}

/* Banner */
.aikayun-banner {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    background: var(--primary-gradient);
    overflow: hidden;
}
.aikayun-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(81,212,255,0.3) 0%, transparent 70%);
    border-radius: 50%;
}
.aikayun-banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -5%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(108,99,232,0.3) 0%, transparent 70%);
    border-radius: 50%;
}
.aikayun-banner-bg {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: url('/upload/aikayun/banner.jpg') center/cover no-repeat;
    opacity: 0.25;
}
.aikayun-banner-content {
    position: relative;
    z-index: 2;
    color: white;
    max-width: 640px;
    animation: fadeInUp 0.8s ease;
}
.aikayun-banner .badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 20px;
    font-size: 13px;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
}
.aikayun-banner h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
    letter-spacing: -1px;
}
.aikayun-banner p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 36px;
    line-height: 1.8;
}
.aikayun-banner-btns {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.aikayun-banner-stats {
    display: flex;
    gap: 48px;
    margin-top: 48px;
}
.aikayun-banner-stat h3 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 4px;
}
.aikayun-banner-stat p {
    font-size: 14px;
    opacity: 0.8;
    margin: 0;
}

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

/* 区块 */
.aikayun-section { padding: 80px 0; }
.aikayun-section.bg-white { background: white; }
.aikayun-section.bg-light { background: var(--bg-light); }
.aikayun-section-title {
    text-align: center;
    margin-bottom: 56px;
}
.aikayun-section-title .subtitle {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(0,82,217,0.08);
    color: var(--primary);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 16px;
}
.aikayun-section-title h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 14px;
    letter-spacing: -0.5px;
}
.aikayun-section-title p {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 产品分类标签 */
.product-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}
.product-tab {
    padding: 10px 24px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    color: var(--text-secondary);
}
.product-tab:hover { color: var(--primary); border-color: var(--primary); }
.product-tab.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: var(--shadow-primary);
}

/* 产品卡片 */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}
.product-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
}
.product-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: var(--transition);
}
.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
    border-color: transparent;
}
.product-card:hover::before { transform: scaleX(1); }
.product-card.hot::after {
    content: '热门';
    position: absolute;
    top: 16px;
    right: -30px;
    background: var(--danger);
    color: white;
    padding: 4px 36px;
    font-size: 12px;
    transform: rotate(45deg);
}
.product-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}
.product-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(0,82,217,0.1) 0%, rgba(20,102,237,0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}
.product-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}
.product-card .product-desc {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 16px;
    min-height: 40px;
}
.product-card .price {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin: 16px 0;
    display: flex;
    align-items: baseline;
    gap: 4px;
}
.product-card .price .currency { font-size: 16px; }
.product-card .price .unit { font-size: 13px; color: var(--text-light); font-weight: 400; }
.product-card .specs {
    list-style: none;
    margin-bottom: 24px;
    padding-top: 16px;
    border-top: 1px dashed var(--border-color);
}
.product-card .specs li {
    padding: 6px 0;
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}
.product-card .specs li::before {
    content: '✓';
    color: var(--success);
    font-weight: 600;
}
.product-card .btn { width: 100%; }

/* 优势卡片 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}
.feature-card {
    text-align: center;
    padding: 40px 28px;
    background: white;
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}
.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}
.feature-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 24px;
    background: var(--primary-gradient);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 32px;
    box-shadow: var(--shadow-primary);
    transition: var(--transition);
}
.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}
.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}
.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* 解决方案 */
.solution-tabs {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}
.solution-tab {
    padding: 12px 28px;
    background: white;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    color: var(--text-secondary);
}
.solution-tab:hover { color: var(--primary); }
.solution-tab.active {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(0,82,217,0.04);
}
.solution-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    background: white;
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-sm);
}
.solution-text h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
}
.solution-text p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}
.solution-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 28px;
}
.solution-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
}
.solution-feature::before {
    content: '✓';
    width: 20px;
    height: 20px;
    background: rgba(0,180,42,0.1);
    color: var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}
.solution-image {
    height: 320px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 64px;
}

/* 数据中心 */
.datacenter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}
.datacenter-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-light);
}
.datacenter-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}
.datacenter-card .flag {
    font-size: 36px;
    margin-bottom: 12px;
}
.datacenter-card h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}
.datacenter-card p {
    font-size: 13px;
    color: var(--text-light);
}

/* CTA区域 */
.cta-section {
    background: var(--primary-gradient);
    padding: 80px 0;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}
.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
    border-radius: 50%;
}
.cta-section h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
}
.cta-section p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 36px;
    position: relative;
}
.cta-section .btn-white {
    position: relative;
    padding: 16px 48px;
    font-size: 16px;
}

/* 页脚 */
.aikayun-footer {
    background: var(--bg-dark);
    color: rgba(255,255,255,0.7);
    padding: 64px 0 24px;
}
.aikayun-footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}
.aikayun-footer-brand h3 {
    color: white;
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.aikayun-footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}
.aikayun-footer-contact {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.aikayun-footer-contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
}
.aikayun-footer-contact-item .icon {
    width: 28px;
    height: 28px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}
.aikayun-footer h4 {
    color: white;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}
.aikayun-footer ul li {
    margin-bottom: 12px;
    font-size: 14px;
}
.aikayun-footer ul li a {
    color: rgba(255,255,255,0.7);
    transition: var(--transition-fast);
}
.aikayun-footer ul li a:hover {
    color: var(--accent);
    padding-left: 4px;
}
.aikayun-footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}
.aikayun-footer-bottom a {
    color: rgba(255,255,255,0.7);
}
.aikayun-footer-bottom a:hover { color: var(--accent); }

/* 响应式 */
@media (max-width: 1024px) {
    .aikayun-menu { display: none; }
    .aikayun-footer-grid { grid-template-columns: 1fr 1fr 1fr; }
    .solution-content { grid-template-columns: 1fr; padding: 32px; }
}
@media (max-width: 768px) {
    .aikayun-banner { min-height: 400px; }
    .aikayun-banner h1 { font-size: 32px; }
    .aikayun-banner p { font-size: 16px; }
    .aikayun-banner-stats { gap: 24px; }
    .aikayun-banner-stat h3 { font-size: 24px; }
    .aikayun-section { padding: 48px 0; }
    .aikayun-section-title h2 { font-size: 28px; }
    .aikayun-footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .aikayun-actions .btn-outline { display: none; }
    .product-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
    .aikayun-footer-grid { grid-template-columns: 1fr; }
    .aikayun-banner-btns { flex-direction: column; }
    .aikayun-banner-btns .btn { width: 100%; }
}