/* 登录页面样式 - 蓝色科技风格 */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 420px;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    animation: slideUp 0.6s ease-out;
}

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

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    color: #667eea;
    margin-bottom: 16px;
}

.login-header h1 {
    font-size: 24px;
    color: #1a202c;
    margin-bottom: 8px;
    font-weight: 600;
}

.subtitle {
    color: #718096;
    font-size: 14px;
}

.login-form {
    margin-bottom: 24px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #2d3748;
    font-size: 14px;
    font-weight: 500;
}

.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: #f7fafc;
}

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

.captcha-group {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.captcha-input-wrapper {
    flex: 1;
}

.captcha-input-wrapper input {
    text-transform: uppercase;
}

.captcha-image-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    margin-top: 28px;
}

.captcha-image {
    width: 120px;
    height: 40px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.captcha-image:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.captcha-image:active {
    transform: scale(0.98);
}

.captcha-hint {
    font-size: 11px;
    color: #a0aec0;
    text-align: center;
    user-select: none;
}

.checkbox-group {
    margin-bottom: 24px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    cursor: pointer;
    accent-color: #667eea;
}

.checkbox-label span {
    color: #4a5568;
    font-size: 14px;
}

.error-message {
    background: #fed7d7;
    color: #c53030;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
    border-left: 4px solid #c53030;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.info-message {
    background: #bee3f8;
    color: #2c5282;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
    border-left: 4px solid #3182ce;
}

.login-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.login-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.login-btn:active:not(:disabled) {
    transform: translateY(0);
}

.login-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.login-footer {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid #e2e8f0;
}

.login-footer p {
    color: #a0aec0;
    font-size: 13px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .login-card {
        padding: 30px 24px;
    }

    .login-header h1 {
        font-size: 20px;
    }

    .captcha-group {
        flex-direction: column;
        align-items: stretch;
    }

    .captcha-image-wrapper {
        flex-direction: row;
        justify-content: space-between;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .login-card {
        padding: 24px 20px;
    }

    .login-header h1 {
        font-size: 18px;
    }

    .logo-icon {
        width: 40px;
        height: 40px;
    }
}