/* mobile.css - 移动端响应式样式
 * 功能: 响应式布局、移动端导航、模态框适配、媒体查询、触摸优化
 * 断点: 768px(移动端), 480px(小屏), 1024px(平板)
 */

/* ===== 移动端通用样式 ===== */

/* 确保sticky定位正常工作的基础样式 */
@media (max-width: 768px) {
    html, body {
        overflow-x: hidden;
        -webkit-overflow-scrolling: touch;
    }
    
    body {
        position: relative;
        /* 为固定定位的header和导航留出空间 */
        padding-top: 116px; /* header(60px) + mobile-nav(56px) + 间距(0px) - 减少20px间距 */
    }
    
    /* 确保header置顶 */
    header {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        width: 100% !important;
        z-index: 1000 !important;
        background: linear-gradient(135deg, var(--surface-color) 0%, rgba(30, 30, 30, 0.95) 100%) !important;
        backdrop-filter: blur(10px) !important;
        border-bottom: 1px solid var(--border-color) !important;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1) !important;
    }
}

/* 移动端菜单按钮 */
.mobile-menu-button {
    display: none;
    background: rgba(187, 134, 252, 0.1);
    border: 1px solid rgba(187, 134, 252, 0.2);
    color: var(--primary-color);
    width: 40px;
    height: 40px;
    border-radius: 8px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-right: 12px;
}

.mobile-menu-button:hover {
    background: rgba(187, 134, 252, 0.2);
    border-color: rgba(187, 134, 252, 0.4);
}

.mobile-menu-button i {
    font-size: 24px;
}

/* 返回顶部按钮 */
.back-to-top-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, #A876E8 100%);
    color: #121212;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 99;
    border: none;
    opacity: 0;
    transform: translateY(20px) scale(0.8);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    pointer-events: none;
}

.back-to-top-button.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.back-to-top-button:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
}

.back-to-top-button i {
    font-size: 24px;
}


/* 侧边栏遮罩层 */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(3px);
    z-index: 98;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* 防止背景滚动 */
body.sidebar-open {
    overflow: hidden;
}

/* ===== 移动端适配样式 ===== */

/* 移动端布局适配 */
.is-mobile .header-left {
    display: flex;
    align-items: center;
}

.is-mobile .mobile-menu-button {
    display: flex;
}

/* ===== 移动端导航 - 优化方案 ===== */

/* 移动端导航容器 - 固定定位确保始终可见 */
.mobile-nav {
    display: none;
    position: fixed !important;
    top: 60px !important; /* 紧贴header下方 */
    left: 0 !important;
    right: 0 !important;
    width: 100% !important;
    background: linear-gradient(180deg, rgba(30, 30, 40, 0.95) 0%, rgba(25, 25, 35, 0.98) 100%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 6px 0;
    z-index: 999 !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    /* 消除任何可能的间隙 */
    margin-top: -1px;
    height: 56px;
    box-sizing: border-box;
    overflow: hidden;
}

/* 移动端导航列表 */
.mobile-nav-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    justify-content: space-around;
    min-width: 300px;
    height: 48px;
    align-items: flex-start;
    box-sizing: border-box;
}

/* 移动端导航项 - 平衡设计 */
.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 4px 8px;
    color: var(--text-secondary);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    height: 48px;
    box-sizing: border-box;
    overflow: hidden;
    justify-content: flex-start;
    border-radius: 8px;
    position: relative;
}

/* 移动端导航项悬停效果 */
.mobile-nav-item:hover {
    background: rgba(187, 134, 252, 0.05);
    color: rgba(187, 134, 252, 0.8);
    transform: translateY(-1px);
}

/* 移动端导航项图标 */
.mobile-nav-item i {
    font-size: 18px;
    margin-bottom: 2px;
    display: block;
    line-height: 1;
}

/* 移动端导航项文字 */
.mobile-nav-item span {
    font-size: 11px;
    display: block;
    text-align: center;
    line-height: 1.1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 移动端导航项激活状态 - 简洁设计 */
.mobile-nav-item.active {
    color: var(--primary-color);
    position: relative;
}

/* 移动端导航项激活指示器 - 简洁亮线 */
.mobile-nav-item.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
    z-index: 10;
}

/* 移动端导航项激活状态文字 */
.mobile-nav-item.active span {
    font-weight: 600;
}

/* 头部左侧区域 */
.header-left {
    display: flex;
    align-items: center;
}

/* 媒体查询 - 移动端适配 */
@media (max-width: 768px) {
    /* 显示移动端导航和菜单按钮 */
    .mobile-nav {
        display: block !important;
        position: -webkit-sticky !important;
        position: sticky !important;
        top: 60px !important;
        z-index: 90 !important;
    }
    
    .mobile-menu-button {
        display: block;
    }
    
    /* 隐藏侧边栏 */
    .sidebar {
        display: none !important;
    }
    
    /* 主容器样式调整 */
    .main-container {
        flex-direction: column !important;
        height: auto !important;
        margin-top: 0 !important;
        padding-top: 0 !important;
        /* 确保sticky定位的父容器正确 */
        position: relative;
        overflow: visible;
    }
    
    /* 内容区域样式调整 */
    .content {
        width: 100% !important;
        margin-left: 0 !important;
        padding-top: 20px !important; /* 增加顶部内边距 */
    }
    
    /* 模块卡片网格调整为单列 */
    .card-grid {
        grid-template-columns: 1fr !important;
        gap: 16px !important;
    }
    
    /* 模块卡片高度自适应 */
    .module-card {
        height: auto !important;
        min-height: 200px !important;
    }
}

/* ===== 响应式断点 ===== */

/* 平板电脑 (768px - 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
    .main-container {
        height: auto;
    }
    
    .sidebar {
        width: 240px;
    }
    
    .content {
        padding: 24px;
    }
    
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 16px;
    }
    
    .module-card {
        width: 100%;
        height: auto;
        min-height: 240px;
    }
}

/* 移动设备 (< 768px) */
@media (max-width: 767px) {
    header {
        padding: 12px 16px;
    }
    
    .logo {
        font-size: 18px;
    }
    
    .logo i {
        font-size: 22px;
    }
    
    .main-container {
        flex-direction: column;
        height: auto;
        padding-top: 0; /* sticky定位不需要额外间距 */
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 12px 0;
    }
    
    .content {
        padding: 20px 16px;
    }
    
    .content-title {
        font-size: 28px;
    }
    
    .content-subtitle {
        font-size: 16px;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .module-card {
        width: 100%;
        height: auto;
        min-height: 200px;
    }
    
    .modal-content,
    .register-overlay-content {
        width: 95%;
        padding: 24px 20px;
    }
    
    .form-submit-btn {
        padding: 14px 24px;
        min-height: 50px;
        font-size: 15px;
    }
}

/* 小型移动设备 (< 480px) */
@media (max-width: 479px) {
    header {
        padding: 10px 12px;
    }
    
    .logo {
        font-size: 16px;
    }
    
    .logo i {
        font-size: 20px;
    }
    
    .main-container {
        padding-top: 0 !important; /* sticky定位不需要额外间距 */
    }
    
    .content {
        padding: 16px 12px;
    }
    
    .content-title {
        font-size: 24px;
    }
    
    .content-subtitle {
        font-size: 14px;
    }
    
    .modal-content,
    .register-overlay-content {
        padding: 20px 16px;
    }
    
    .form-submit-btn {
        padding: 12px 20px;
        min-height: 46px;
        font-size: 14px;
    }
    
    .auth-buttons .btn {
        padding: 6px 10px;
        font-size: 12px;
        min-width: 60px;
    }
    
    .auth-buttons .btn i {
        font-size: 14px;
    }
}