/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    overflow-x: hidden;
}

/* 登录页面背景 */
.login-bg {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    position: relative;
}

.login-bg::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="50" cy="50" r="0.5" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
    pointer-events: none;
}

/* 登录卡片 */
.login-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 1;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    border-radius: 20px;
    z-index: -1;
}

/* 输入框样式 */
.form-control {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    border-radius: 10px;
    padding: 12px 15px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.form-control:focus {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.5);
    box-shadow: 0 0 0 0.2rem rgba(255, 255, 255, 0.25);
    color: #fff;
}

.form-control::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

/* 输入组样式 */
.input-group-text {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.7);
    border-radius: 10px 0 0 10px;
}

.input-group .form-control {
    border-radius: 0 10px 10px 0;
}

.input-group .form-control:first-child {
    border-radius: 10px 0 0 10px;
}

/* 按钮样式 */
.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 10px;
    padding: 12px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

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

.btn-outline-light {
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #fff;
    border-radius: 10px;
    padding: 8px 20px;
    transition: all 0.3s ease;
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    color: #fff;
}

/* 密码切换按钮 */
#togglePassword {
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-left: none;
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
    border-radius: 0 10px 10px 0;
}

#togglePassword:hover {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
}

/* 复选框样式 */
.form-check-input {
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.form-check-input:checked {
    background-color: #667eea;
    border-color: #667eea;
}

.form-check-input:focus {
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

/* 链接样式 */
a {
    transition: all 0.3s ease;
}

a:hover {
    color: #fff !important;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

/* 模态框样式 */
.modal-content {
    border-radius: 15px;
    border: none;
    box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
}

.modal-header {
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 15px 15px 0 0;
}

.modal-footer {
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 0 0 15px 15px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .login-card {
        padding: 2rem;
        margin: 1rem;
    }
    
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 576px) {
    .login-card {
        padding: 1.5rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
}

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

.login-card {
    animation: fadeInUp 0.8s ease-out;
}

/* 加载状态 */
.spinner-border {
    width: 1rem;
    height: 1rem;
}

/* 错误提示 */
.invalid-feedback {
    color: #ff6b6b;
    font-size: 14px;
    margin-top: 5px;
}

/* 成功提示 */
.valid-feedback {
    color: #51cf66;
    font-size: 14px;
    margin-top: 5px;
}

/* 图标样式 */
.fas {
    transition: all 0.3s ease;
}

.fa-newspaper {
    color: #667eea;
    text-shadow: 0 0 20px rgba(102, 126, 234, 0.5);
}

/* 悬停效果 */
.login-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
}

/* 输入框悬停效果 */
.form-control:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}