/* 登录页面样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    background: white;
    padding: 3rem 2.5rem;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-title {
    font-size: 2rem;
    font-weight: 600;
    color: #1a202c;
    margin-bottom: 0.5rem;
}

.login-subtitle {
    color: #718096;
    font-size: 0.95rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: #374151;
    font-weight: 500;
    font-size: 0.9rem;
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1.5px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.2s ease;
    background: #fafafa;
}

.form-input:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-input:hover {
    border-color: #d1d5db;
}

.login-btn {
    width: 100%;
    padding: 0.875rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.login-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

.login-btn:active {
    transform: translateY(0);
}

.login-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.login-btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    margin: auto;
    border: 2px solid transparent;
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error-message {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: none;
    padding: 0.5rem;
    background: #fef2f2;
    border-radius: 6px;
    border: 1px solid #fecaca;
}

.error-message.show {
    display: block;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.remember-forgot {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1.5rem 0;
    font-size: 0.875rem;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.remember-me input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: #667eea;
}

.forgot-password {
    color: #667eea;
    text-decoration: none;
    transition: color 0.2s ease;
}

.forgot-password:hover {
    color: #764ba2;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 1rem;
        min-height: 100vh;
        height: auto;
    }
    
    .login-container {
        margin: 0;
        padding: 2rem 1.5rem;
        min-height: auto;
        max-width: none;
        width: 100%;
        border-radius: 12px;
    }
    
    .login-title {
        font-size: 1.75rem;
    }
    
    .login-subtitle {
        font-size: 0.9rem;
    }
    
    .form-input {
        padding: 1rem;
        font-size: 16px; /* 防止iOS缩放 */
    }
    
    .login-btn {
        padding: 1rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .login-container {
        padding: 1.5rem 1rem;
        margin: 0.5rem;
        width: calc(100% - 1rem);
    }
    
    .login-title {
        font-size: 1.5rem;
    }
    
    .remember-forgot {
        flex-direction: column;
        gap: 0.75rem;
        align-items: flex-start;
    }
    
    .form-label {
        font-size: 0.9rem;
    }
}