/* 全局变量 */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --background: #ecf0f1;
    --white: #ffffff;
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.2);
    --gradient-primary: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    --gradient-accent: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    --font-primary: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-secondary: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 背景动画 */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, #ecf0f1 0%, #bdc3c7 100%);
}

/* 浮动形状 */
.floating-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(52, 152, 219, 0.1);
    animation: float 8s ease-in-out infinite;
}

.shape-1 {
    width: 120px;
    height: 120px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 80px;
    height: 80px;
    top: 60%;
    right: 15%;
    animation-delay: 3s;
}

.shape-3 {
    width: 100px;
    height: 100px;
    top: 80%;
    left: 60%;
    animation-delay: 6s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
}

/* 主容器 */
.main-container {
    width: 100%;
    max-width: 600px;
    padding: 2rem;
}

.content {
    background: white;
    padding: 3rem 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.logo {
    margin-bottom: 2rem;
}

.logo i {
    font-size: 3rem;
    color: #3498db;
    margin-bottom: 1rem;
    display: block;
}

.logo h1 {
    font-size: 2rem;
    font-weight: 600;
    color: #2c3e50;
}

.description {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 2rem;
}

.status {
    margin-bottom: 2rem;
}

.status-text {
    background: #3498db;
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-weight: 500;
}

.beta-link {
    margin-bottom: 2rem;
}

.beta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #27ae60 0%, #2ecc71 100%);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(39, 174, 96, 0.3);
}

.beta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(39, 174, 96, 0.4);
    text-decoration: none;
    color: white;
}

.beta-button i {
    font-size: 0.9rem;
}

.beta-info {
    margin-bottom: 2rem;
}

.beta-notice {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(52, 152, 219, 0.1);
    color: #3498db;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    border-left: 4px solid #3498db;
}

.beta-notice i {
    font-size: 1rem;
}

.contact {
    border-top: 1px solid #eee;
    padding-top: 2rem;
}

.contact p {
    color: #666;
    font-size: 0.9rem;
}

.contact a {
    color: #3498db;
    text-decoration: none;
}

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

.feedback-text {
    color: #7f8c8d !important;
    font-size: 0.85rem !important;
    font-style: italic;
    margin-top: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-container {
        padding: 1rem;
    }
    
    .content {
        padding: 2rem 1.5rem;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .description {
        font-size: 1rem;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* 选择文本样式 */
::selection {
    background: var(--accent-color);
    color: var(--white);
}

/* 加载动画 */
.loading {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

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

/* 悬停效果增强 */
.feature-card:hover .feature-icon {
    transform: scale(1.1);
    color: var(--primary-color);
}

/* 焦点样式 */
.btn:focus,
.nav-link:focus,
.feature-card:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}