/* 登录页面样式 */

/* 全局样式变量 */
:root {
    --primary-gradient: linear-gradient(135deg, #4361ee 0%, #3f37c9 100%);
    --primary-color: #4361ee;
    --secondary-color: #4cc9f0;
    --dark-color: #2b2d42;
    --light-color: #f8f9fa;
    --danger-color: #ef476f;
    --success-color: #06d6a0;
    --border-radius: 12px;
    --shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 25px 50px rgba(0, 0, 0, 0.15);
}

/* 登录页面容器 */
.login-page {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

/* 登录卡片 */
.login-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    width: 100%;
    max-width: 500px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

/* 卡片头部 */
.login-card-header {
    background: var(--primary-gradient);
    color: white;
    padding: 2.5rem 2rem 2rem;
    text-align: center;
    position: relative;
}

.login-card-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="20" cy="80" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.login-card-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
}

.login-card-header p {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: 0;
    position: relative;
    z-index: 1;
}

/* 卡片主体 */
.login-card-body {
    padding: 2.5rem 2rem;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.form-label {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    display: block;
    font-size: 0.95rem;
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background-color: #f8f9fa;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: white;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
    transform: translateY(-1px);
}

.form-control::placeholder {
    color: #6c757d;
    opacity: 0.7;
}

/* 输入框图标 */
.input-group {
    position: relative;
}

.input-group .form-control {
    padding-left: 3rem;
}

.input-group-text {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #6c757d;
    z-index: 10;
    font-size: 1.1rem;
}

/* 记住我复选框 */
.form-check {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.form-check-input {
    width: 1.2rem;
    height: 1.2rem;
    margin-right: 0.5rem;
    border: 2px solid #dee2e6;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.form-check-label {
    font-size: 0.95rem;
    color: var(--dark-color);
    cursor: pointer;
}

/* 登录按钮 */
.btn-login {
    width: 100%;
    padding: 0.875rem;
    background: var(--primary-gradient);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-login:hover::before {
    left: 100%;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(67, 97, 238, 0.3);
}

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

/* 忘记密码链接 */
.forgot-password {
    text-align: center;
    margin-top: 1.5rem;
}

.forgot-password a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

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

/* 注册链接 */
.register-link {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e9ecef;
}

.register-link p {
    margin-bottom: 0.5rem;
    color: #6c757d;
    font-size: 0.95rem;
}

.register-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.register-link a:hover {
    color: var(--dark-color);
    text-decoration: underline;
}

/* 错误消息样式 */
.alert {
    border-radius: 8px;
    border: none;
    padding: 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.alert-danger {
    background-color: rgba(239, 71, 111, 0.1);
    color: var(--danger-color);
    border-left: 4px solid var(--danger-color);
}

.alert-success {
    background-color: rgba(6, 214, 160, 0.1);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

/* 加载状态 */
.btn-login.loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn-login.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid transparent;
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 响应式设计 */
@media (max-width: 576px) {
    .login-page {
        padding: 1rem;
    }
    
    .login-card-header {
        padding: 2rem 1.5rem 1.5rem;
    }
    
    .login-card-header h1 {
        font-size: 1.75rem;
    }
    
    .login-card-body {
        padding: 2rem 1.5rem;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-card {
    animation: fadeInUp 0.6s ease-out;
}

/* 表单验证样式 */
.form-control.is-invalid {
    border-color: var(--danger-color);
    background-color: rgba(239, 71, 111, 0.05);
}

.form-control.is-valid {
    border-color: var(--success-color);
    background-color: rgba(6, 214, 160, 0.05);
}

.invalid-feedback {
    display: block;
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.valid-feedback {
    display: block;
    color: var(--success-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}