:root {
    /* 颜色系统 */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);

    --bg-dark: #0a0e27;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-hover: rgba(255, 255, 255, 0.08);

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);

    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);

    /* 字体 */
    --font-primary: 'Inter', 'Noto Sans SC', sans-serif;

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* 动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: var(--font-primary);
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* 背景动画 */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #667eea 0%, transparent 70%);
    top: -250px;
    left: -250px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #764ba2 0%, transparent 70%);
    bottom: -200px;
    right: -200px;
    animation-delay: -7s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, #f093fb 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    33% {
        transform: translate(100px, -100px) scale(1.1);
    }

    66% {
        transform: translate(-100px, 100px) scale(0.9);
    }
}

.stars {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(2px 2px at 20% 30%, white, transparent),
        radial-gradient(2px 2px at 60% 70%, white, transparent),
        radial-gradient(1px 1px at 50% 50%, white, transparent),
        radial-gradient(1px 1px at 80% 10%, white, transparent),
        radial-gradient(2px 2px at 90% 60%, white, transparent),
        radial-gradient(1px 1px at 33% 80%, white, transparent);
    background-size: 200% 200%;
    animation: twinkle 8s ease-in-out infinite;
    opacity: 0.3;
}

@keyframes twinkle {

    0%,
    100% {
        opacity: 0.3;
    }

    50% {
        opacity: 0.6;
    }
}

/* 主容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
    z-index: 1;
}

/* Logo区域 */
.logo-section {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    animation: fadeInDown 0.8s ease;
}

.logo-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto;
    filter: drop-shadow(var(--shadow-glow));
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

/* 主标题 */
.main-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease 0.2s both;
}

.title-line {
    display: block;
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.title-subtitle {
    display: block;
    font-size: clamp(1rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 0.05em;
}

/* 域名显示 */
.domain-display {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease 0.4s both;
}

.domain-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.domain-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.domain-card:hover::before {
    left: 100%;
}

.domain-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow), var(--shadow-lg);
    border-color: rgba(102, 126, 234, 0.5);
}

.domain-icon {
    font-size: 2rem;
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.domain-text {
    font-size: clamp(1.2rem, 3vw, 2rem);
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

/* 特性列表 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.feature-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
    animation: fadeInUp 0.8s ease both;
}

.feature-card:nth-child(1) {
    animation-delay: 0.5s;
}

.feature-card:nth-child(2) {
    animation-delay: 0.6s;
}

.feature-card:nth-child(3) {
    animation-delay: 0.7s;
}

.feature-card:hover {
    transform: translateY(-10px);
    background: var(--bg-card-hover);
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    display: inline-block;
    transition: transform var(--transition-normal);
}

.feature-card:hover .feature-icon {
    transform: scale(1.2) rotate(5deg);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 购买按钮 */
.contact-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease 0.8s both;
}

.purchase-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg) var(--spacing-xl);
    min-width: 200px;
    border-radius: 50px;
    font-size: 1.3rem;
    font-weight: 700;
    text-decoration: none;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md);
    border: none;
}

.purchase-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.purchase-btn:hover::before {
    width: 400px;
    height: 400px;
}

.purchase-btn:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: var(--shadow-glow), var(--shadow-lg);
}

.purchase-btn:active {
    transform: translateY(-3px) scale(1.02);
}

.purchase-btn .btn-icon {
    width: 28px;
    height: 28px;
    position: relative;
    z-index: 1;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-5px);
    }
}

.purchase-btn span {
    position: relative;
    z-index: 1;
    letter-spacing: 0.05em;
}

/* 页脚 */
.footer {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    animation: fadeIn 1s ease 1s both;
}

.footer p {
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    align-items: center;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

.separator {
    color: var(--text-muted);
}

/* 动画定义 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-lg) var(--spacing-sm);
    }

    .features {
        grid-template-columns: 1fr;
    }

    .contact-methods {
        flex-direction: column;
        align-items: stretch;
    }

    .contact-btn {
        justify-content: center;
    }

    .domain-card {
        flex-direction: column;
        padding: var(--spacing-md);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .separator {
        display: none;
    }
}

/* 打印样式 */
@media print {
    .background {
        display: none;
    }

    body {
        background: white;
        color: black;
    }
}