/* 响应式设计断点 */
:root {
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
}

/* 小屏幕设备（手机，小于768px） */
@media (max-width: 767px) {
    /* 导航栏适配 */
    .nav-container {
        height: auto;
        padding: 10px;
        flex-direction: column;
        align-items: stretch;
    }

    .nav-title {
        text-align: center;
        padding-right: 0;
        margin-bottom: 10px;
    }

    .nav-links {
        flex-direction: column;
        gap: 10px;
        width: 100%;
    }

    .nav-links .nav-item {
        width: 100%;
        text-align: center;
        padding: 10px 0;
    }

    .user-info {
        margin-top: 10px;
        text-align: center;
    }

    /* 主要内容区域适配 */
    .home-container {
        padding: 20px;
    }

    .hero-section {
        padding: 30px 10px;
    }

    .stats-bar {
        flex-direction: column;
        gap: 20px;
    }

    .feature-card {
        margin-bottom: 20px;
    }

    /* 仪表盘适配 */
    .dashboard-container {
        padding: 10px;
        margin-top: 200px;
    }

    .glass-panel {
        margin: 10px 0;
        padding: 15px;
    }

    /* 表格适配 */
    .table-responsive {
        overflow-x: auto;
    }

    /* 图表适配 */
    .chart-container {
        height: 300px !important;
    }
}

/* 平板设备（768px到991px） */
@media (min-width: 768px) and (max-width: 991px) {
    .nav-container {
        padding: 15px 20px;
    }

    .nav-links {
        gap: 20px;
    }

    .stats-bar {
        flex-wrap: wrap;
        gap: 20px;
    }

    .dashboard-container {
        margin-top: 150px;
    }
}

/* 通用响应式布局类 */
.flex-responsive {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

@media (max-width: 767px) {
    .flex-responsive {
        flex-direction: column;
    }

    .flex-responsive > * {
        width: 100% !important;
    }
}

/* 响应式字体大小 */
@media (max-width: 767px) {
    html {
        font-size: 14px;
    }

    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.2rem;
    }
}

/* 响应式间距 */
@media (max-width: 767px) {
    .container {
        padding: 10px;
    }

    .section {
        margin-bottom: 30px;
    }

    .row {
        margin: 0 -10px;
    }
}

/* 响应式图片 */
img {
    max-width: 100%;
    height: auto;
}

/* 响应式表单 */
@media (max-width: 767px) {
    input, select, textarea {
        width: 100%;
        margin-bottom: 10px;
    }

    .form-group {
        margin-bottom: 15px;
    }

    .btn {
        width: 100%;
        margin-bottom: 10px;
    }
}

/* 响应式模态框 */
@media (max-width: 767px) {
    .modal-dialog {
        margin: 10px;
        width: auto;
    }

    .modal-content {
        padding: 15px;
    }
}

/* 响应式工具类 */
@media (max-width: 767px) {
    .hide-on-mobile {
        display: none !important;
    }
}

@media (min-width: 768px) {
    .show-on-mobile {
        display: none !important;
    }
}