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

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

.container {
    text-align: center;
    padding: 60px 40px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 600px;
    width: 90%;
    animation: fadeIn 0.6s ease-out;
}

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

.avatar {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    margin: 0 auto 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 60px;
    color: white;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

h1 {
    font-size: 42px;
    color: #333;
    margin-bottom: 15px;
    font-weight: 700;
}

.welcome {
    font-size: 24px;
    color: #667eea;
    margin-bottom: 25px;
    font-weight: 500;
}

.message {
    font-size: 16px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 30px;
}

.auth-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
    background: white;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-secondary:hover {
    background: #667eea;
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a5a 100%);
    color: white;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(238, 90, 90, 0.5);
}

.btn-full {
    width: 100%;
}

.footer {
    font-size: 14px;
    color: #999;
    padding-top: 20px;
    border-top: 1px solid #eee;
    margin-top: 20px;
}

.footer span {
    color: #667eea;
    font-weight: 600;
}

.sparkle {
    animation: sparkle 2s infinite;
}

@keyframes sparkle {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* 表单样式 */
.auth-container {
    max-width: 400px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #eee;
    border-radius: 25px;
    font-size: 16px;
    transition: border-color 0.3s ease;
    outline: none;
}

.form-group input:focus {
    border-color: #667eea;
}

.auth-link {
    margin-top: 20px;
    color: #666;
    font-size: 14px;
}

.auth-link a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

.auth-link a:hover {
    text-decoration: underline;
}

/* 消息提示 */
.flash-success {
    background: #d4edda;
    color: #155724;
    padding: 12px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 1px solid #c3e6cb;
}

.flash-error {
    background: #f8d7da;
    color: #721c24;
    padding: 12px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 1px solid #f5c6cb;
}

.flash-messages {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

/* 响应式 */
@media (max-width: 480px) {
    .container {
        padding: 40px 25px;
    }
    
    h1 {
        font-size: 32px;
    }
    
    .welcome {
        font-size: 20px;
    }
    
    .auth-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}