/* 管理员登录页面样式 */
:root {
    --login-primary: #d7000f;
    --login-primary-dark: #a71c1c;
    --login-bg: #f5f7fa;
    --login-card: #ffffff;
    --login-text: #333333;
    --login-border: #e0e0e0;
    --login-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: var(--login-bg);
    color: var(--login-text);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(215, 0, 15, 0.05) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(215, 0, 15, 0.05) 0%, transparent 20%);
}

.login-container {
    width: 100%;
    max-width: 480px;
    padding: 20px;
}

.login-box {
    background-color: var(--login-card);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--login-shadow);
    transform: translateY(0);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.login-header {
    background: linear-gradient(135deg, var(--login-primary), var(--login-primary-dark));
    padding: 40px 30px;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.login-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 20px 20px;
    animation: float 20s linear infinite;
}

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

.login-logo {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 36px;
    backdrop-filter: blur(5px);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.login-header h2 {
    font-size: 28px;
    margin-bottom: 10px;
    font-weight: 700;
}

.login-header p {
    font-size: 16px;
    opacity: 0.9;
}

.login-body {
    padding: 40px 30px;
}

.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease;
}

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

.alert-error {
    background-color: #ffebee;
    border-left: 4px solid #f44336;
    color: #c62828;
}

.alert-error i {
    color: #f44336;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: #444;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-group input {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--login-border);
    border-radius: 10px;
    font-family: inherit;
    font-size: 16px;
    transition: all 0.3s ease;
    background-color: #f8f9fa;
}

.form-group input:focus {
    outline: none;
    border-color: var(--login-primary);
    background-color: white;
    box-shadow: 0 0 0 4px rgba(215, 0, 15, 0.1);
}

.btn-login {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--login-primary), var(--login-primary-dark));
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-login:hover {
    background: linear-gradient(135deg, var(--login-primary-dark), #8a0000);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(215, 0, 15, 0.3);
}

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

.login-footer {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--login-border);
    text-align: center;
    color: #666;
    font-size: 14px;
}

.login-footer p {
    margin-bottom: 8px;
}

.login-footer p:last-child {
    margin-bottom: 0;
    color: #999;
    font-size: 13px;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .login-container {
        padding: 15px;
    }
    
    .login-header {
        padding: 30px 20px;
    }
    
    .login-body {
        padding: 30px 20px;
    }
    
    .login-logo {
        width: 70px;
        height: 70px;
        font-size: 32px;
    }
    
    .login-header h2 {
        font-size: 24px;
    }
}

/* 加载动画 */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* 输入框错误状态 */
.form-group.error input {
    border-color: #f44336;
    background-color: #fff5f5;
}

.form-group .error-message {
    color: #f44336;
    font-size: 13px;
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* 记住我选项 */
.remember-me {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.remember-me input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.remember-me label {
    margin: 0;
    font-size: 14px;
    color: #666;
    cursor: pointer;
}

/* 忘记密码链接 */
.forgot-password {
    text-align: center;
    margin-top: 20px;
}

.forgot-password a {
    color: var(--login-primary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.forgot-password a:hover {
    color: var(--login-primary-dark);
    text-decoration: underline;
}