/* 登录页面样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
.login-container {
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    width: 90%;
    max-width: 400px;
    text-align: center;
    animation: fadeInUp 0.5s ease;
}
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.login-title {
    margin-bottom: 1.5rem;
    color: #333;
    font-weight: 700;
    font-size: 1.5rem;
}
.login-input {
    width: 100%;
    padding: 0.9rem;
    margin-bottom: 1.2rem;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.2s ease;
}
.login-input:focus {
    border-color: #667eea;
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}
.login-btn {
    width: 100%;
    padding: 0.9rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}
.login-btn:hover {
    background: linear-gradient(135deg, #5a67d8, #6b46c1);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}
.login-btn:active {
    transform: translateY(0);
}
.error {
    color: #e53e3e;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    padding: 0.5rem;
    background: #fed7d7;
    border-radius: 6px;
    border: 1px solid #feb2b2;
}
.hint {
    color: #718096;
    font-size: 0.9rem;
    margin-top: 1rem;
    line-height: 1.5;
}