/* style.css - 蚂蚁云国际官网样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #3b82f6;
    --primary-light: #60a5fa;
    --accent: #a78bfa;
    --gradient-start: #2563eb;
    --gradient-end: #7c3aed;
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-bg: rgba(20, 30, 50, 0.5);
    --text-light: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.75);
    --text-dim: rgba(255, 255, 255, 0.5);
    --shadow-heavy: 0 20px 40px rgba(0, 0, 0, 0.4);
    --shadow-light: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    font-family: var(--font-sans);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    background: #0b1120;
}

/* 视频背景 */
.video-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    overflow: hidden;
}

.video-background video {
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    object-fit: cover;
    opacity: 0.4;
}

.video-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 30%, rgba(20, 30, 60, 0.7), #030614 90%);
    z-index: -1;
}

/* 粒子容器 */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    pointer-events: none;
    backdrop-filter: blur(1px);
}

/* 导航栏 */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    backdrop-filter: blur(16px) saturate(180%);
    background: rgba(10, 15, 30, 0.5);
    border-bottom: 1px solid var(--glass-border);
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

.logo span {
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: white;
}

.nav-links .contact-btn-nav {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    padding: 0.5rem 1.2rem;
    border-radius: 40px;
    color: white;
    font-weight: 600;
    box-shadow: var(--shadow-light);
}

/* 主要内容区 */
.vendors {
    padding: 2rem 5% 4rem;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

/* 主卡片 */
.main-vendor {
    margin: 2rem 0 3rem;
}

.main-vendor-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 40px;
    padding: 3.5rem 3rem;
    text-align: center;
    max-width: 950px;
    margin: 0 auto;
    box-shadow: var(--shadow-heavy);
    transition: transform 0.3s, border-color 0.2s;
}

.main-vendor-card:hover {
    border-color: rgba(255,255,255,0.2);
    transform: scale(1.01);
}

.main-icon {
    font-size: 4rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.2rem;
}

.main-vendor-card h3 {
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    background: linear-gradient(135deg, #fff, #e2e8f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.main-vendor-card p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 750px;
    margin: 0 auto 2rem;
}

.main-contact-btn {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border: none;
    padding: 1rem 2.8rem;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 60px;
    color: white;
    cursor: pointer;
    box-shadow: 0 10px 25px -5px rgba(37,99,235,0.4);
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.main-contact-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 30px -5px rgba(124,58,237,0.5);
}

/* 优势部分 */
.advantages {
    margin: 5rem 0;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

.section-title i {
    color: var(--primary-light);
    margin-right: 0.5rem;
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.8rem;
}

.advantage-item {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 30px;
    padding: 2rem 1.8rem;
    transition: all 0.25s;
}

.advantage-item:hover {
    background: rgba(255,255,255,0.12);
    border-color: rgba(255,255,255,0.25);
    transform: translateY(-5px);
}

.advantage-item i {
    font-size: 2.2rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.2rem;
}

.advantage-item h4 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.advantage-item p {
    color: var(--text-muted);
    font-size: 0.98rem;
}

/* 分隔标题 */
.platform-divider {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin: 4rem 0 2.5rem;
}

.platform-divider .line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-light), transparent);
}

.platform-divider span {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--primary-light);
    letter-spacing: 1px;
}

/* 厂商卡片网格 */
.vendor-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 2rem;
    margin: 2rem 0 4rem;
}

.vendor-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 28px;
    padding: 2rem 1.5rem 1.8rem;
    text-align: center;
    transition: all 0.25s;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.vendor-card:hover {
    transform: translateY(-8px);
    border-color: rgba(255,255,255,0.3);
    box-shadow: var(--shadow-heavy);
    background: rgba(30, 40, 60, 0.6);
}

.vendor-icon {
    width: 90px;
    height: 90px;
    border-radius: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.9rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    box-shadow: 0 15px 25px -8px rgba(0,0,0,0.5);
    transition: transform 0.2s;
}

.vendor-card:hover .vendor-icon {
    transform: scale(1.02);
}

.vendor-card h4 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.vendor-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex: 1;
}

.card-btn {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 0.7rem 1.8rem;
    border-radius: 40px;
    color: white;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    font-size: 0.95rem;
    backdrop-filter: blur(4px);
    margin-top: 0.5rem;
}

.card-btn:hover {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-color: transparent;
    box-shadow: 0 8px 18px rgba(59,130,246,0.3);
}

/* 品牌专属颜色 */
.bg-ali { background: #FF6A00; }
.bg-tencent { background: #006CFF; }
.bg-google { background: #4285F4; }
.bg-aws { background: #FF9900; }
.bg-azure { background: #0078D4; }

/* 联系区域 */
.contact-section {
    margin: 5rem 0 3rem;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    padding: 3rem 2.5rem;
    text-align: center;
}

.contact-section h3 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.contact-section > p {
    color: var(--text-muted);
    max-width: 550px;
    margin: 0 auto 2.5rem;
}

.contact-methods {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2.5rem;
    margin: 2rem 0;
}

.contact-method {
    background: rgba(0,0,0,0.25);
    border-radius: 40px;
    padding: 1.8rem 2.2rem;
    min-width: 220px;
    border: 1px solid var(--glass-border);
    transition: 0.2s;
}

.contact-method:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--primary-light);
}

.contact-method i {
    font-size: 2.5rem;
    color: var(--primary-light);
    margin-bottom: 0.8rem;
}

.contact-method h4 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

.contact-method a, .contact-method p {
    color: var(--text-muted);
    text-decoration: none;
    display: block;
    font-size: 1.1rem;
    word-break: break-word;
}

.contact-method a:hover {
    color: white;
    text-decoration: underline;
}

.official-website {
    margin-top: 2.5rem;
    background: rgba(59,130,246,0.15);
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: 60px;
    border: 1px solid rgba(59,130,246,0.4);
}

.official-website a {
    color: white;
    font-weight: 600;
    text-decoration: none;
    font-size: 1.2rem;
}

.official-website i {
    margin-right: 0.5rem;
    color: var(--primary-light);
}

/* 页脚 */
footer {
    text-align: center;
    padding: 2.5rem 5%;
    border-top: 1px solid rgba(255,255,255,0.05);
    color: var(--text-dim);
    font-size: 0.95rem;
    backdrop-filter: blur(8px);
}

/* 响应式 */
@media (max-width: 900px) {
    .navbar { padding: 0.8rem 5%; }
    .nav-links { gap: 1.5rem; }
    .main-vendor-card { padding: 2.5rem 1.5rem; }
    .main-vendor-card h3 { font-size: 2rem; }
    .section-title { font-size: 2rem; }
}

@media (max-width: 600px) {
    .navbar { flex-wrap: wrap; justify-content: center; gap: 0.5rem; }
    .nav-links { flex-wrap: wrap; justify-content: center; gap: 1rem; }
    .main-vendor-card h3 { font-size: 1.7rem; }
    .main-icon { font-size: 3rem; }
    .vendor-icon { width: 75px; height: 75px; font-size: 1.5rem; }
    .contact-methods { flex-direction: column; align-items: center; }
    .contact-method { width: 100%; max-width: 300px; }
}

html {
    scroll-behavior: smooth;
}