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

html {
    font-size: 14px;
}

body.login-page {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 0.5rem;
}

.login-box {
    background: #fff;
    border-radius: 0.75rem;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    overflow: hidden;
}

.login-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 1.5rem 1rem;
    text-align: center;
}

.login-header h1 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.login-header p {
    font-size: 0.75rem;
    opacity: 0.9;
    letter-spacing: 1px;
}

.login-form {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.35rem;
    color: #333;
    font-weight: 500;
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.625rem 0.75rem;
    border: 1px solid #ddd;
    border-radius: 0.375rem;
    font-size: 0.9rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.form-control::placeholder {
    color: #adb5bd;
}

.btn-login {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 0.375rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

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

.error-message {
    background: #ffe0e0;
    color: #d63031;
    padding: 0.75rem;
    border-radius: 0.375rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.success-message {
    background: #e0ffe0;
    color: #00b894;
    padding: 0.75rem;
    border-radius: 0.375rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

/* 记住我 */
.form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-check-input {
    width: 1rem;
    height: 1rem;
    margin: 0;
}

.form-check-label {
    font-size: 0.875rem;
    color: #666;
}

/* 底部信息 */
.login-footer {
    text-align: center;
    margin-top: 1rem;
    color: rgba(255,255,255,0.7);
    font-size: 0.75rem;
}

/* ===================================
   响应式适配 - 手机 (< 576px)
   =================================== */
@media (max-width: 576px) {
    html {
        font-size: 12px;
    }
    
    body.login-page {
        padding: 0.5rem;
        align-items: flex-start;
        padding-top: 2rem;
    }
    
    .login-container {
        max-width: 100%;
    }
    
    .login-header {
        padding: 1.25rem 1rem;
    }
    
    .login-header h1 {
        font-size: 1.125rem;
    }
    
    .login-form {
        padding: 1.25rem;
    }
    
    .form-group {
        margin-bottom: 0.875rem;
    }
    
    .form-group label {
        font-size: 0.875rem;
    }
    
    .btn-login {
        padding: 0.625rem;
        font-size: 0.9375rem;
    }
}

/* ===================================
   响应式适配 - 小手机 (< 375px)
   =================================== */
@media (max-width: 375px) {
    .login-header h1 {
        font-size: 1rem;
    }
    
    .login-header p {
        font-size: 0.6875rem;
    }
    
    .login-form {
        padding: 1rem;
    }
}