* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "PingFang SC", "Helvetica Neue", Arial, sans-serif;
        }
        
        body {
            background-color: #f5f5f5;
            color: #333;
            padding: 0;
        }
        
        .container {
            width: 100%;
            max-width: 100%;
            margin: 0 auto;
            background: white;
            overflow: hidden;
            min-height: 100vh;
            padding-top: 56px;
        }
        
        .nav-tabs {
            display: flex;
            background: white;
            padding: 0 15px;
            border-bottom: 1px solid #eee;
            position: fixed;
            top: 66px;
            left: 0;
            width: 100%;
            height: 56px;
            z-index: 2;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            align-items: center;
        }
        
        .nav-tab {
            flex: 1;
            text-align: center;
            padding: 15px 0;
            font-size: 16px;
            color: #999;
            position: relative;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .nav-tab:hover {
            color: #007AFF;
        }
        
        .nav-tab.active {
            color: #007AFF;
            font-weight: 500;
        }
        
        .nav-tab.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: #007AFF;
            border-radius: 2px;
        }
        
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: #007AFF;
            color: white;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 99;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
            font-size: 20px;
        }
        
        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        
        .back-to-top:hover {
            background: #0066CC;
            transform: translateY(-3px);
        }
        
        .section {
            padding: 15px;
            animation: fadeIn 0.5s ease;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .section-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 15px;
            color: #000;
            display: flex;
            align-items: center;
        }
        
        .section-title::before {
            content: '';
            display: inline-block;
            width: 4px;
            height: 16px;
            background: #007AFF;
            border-radius: 2px;
            margin-right: 8px;
        }
        
        .today-apps {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
        }
        
        .app-card {
            background: white;
            border-radius: 12px;
            padding: 15px;
            text-align: center;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        
        .app-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        .app-icon {
            width: 60px;
            height: 60px;
            background: #f0f0f0;
            border-radius: 14px;
            margin: 0 auto 12px;
            background-size: cover;
            background-position: center;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
        }
        
        .app-name {
            font-size: 14px;
            font-weight: 500;
            margin-bottom: 12px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        
        .download-btn {
            background: linear-gradient(to right, #4CD964, #2BCB5B);
            color: white;
            border: none;
            border-radius: 18px;
            padding: 6px 0;
            width: 80px;
            font-size: 13px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 2px 4px rgba(76, 217, 100, 0.3);
        }
        
        .download-btn:hover {
            transform: scale(1.05);
            box-shadow: 0 4px 8px rgba(76, 217, 100, 0.4);
        }
        
        .app-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        
        .app-row {
            display: flex;
            align-items: center;
            padding: 12px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        
        .app-row:hover {
            transform: translateX(5px);
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        }
        
        .app-info {
            flex: 1;
            display: flex;
            align-items: center;
        }
        
        .list-app-icon {
            width: 48px;
            height: 48px;
            background: #fff;
            border-radius: 10px;
            margin-right: 15px;
            background-size: cover;
            background-position: center;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }
        
        .list-app-name {
            font-size: 14px;
            font-weight: 500;
        }
        
        .list-download-btn {
            background: linear-gradient(to right, #4CD964, #2BCB5B);
            color: white;
            border: none;
            border-radius: 18px;
            padding: 8px 18px;
            font-size: 14px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 2px 4px rgba(76, 217, 100, 0.3);
        }
        
        .list-download-btn:hover {
            transform: scale(1.05);
            box-shadow: 0 4px 8px rgba(76, 217, 100, 0.4);
        }
        
        .download-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 1000;
            animation: fadeIn 0.3s ease;
        }
        
        .download-modal.active {
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .download-content {
            background-color: white;
            border-radius: 16px;
            width: 85%;
            max-width: 320px;
            padding: 25px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
            transform: scale(0.9);
            animation: popIn 0.3s ease forwards;
            position: relative;
        }
        
        @keyframes popIn {
            to { transform: scale(1); }
        }
        
        .download-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 20px;
            text-align: center;
            color: #333;
        }
        
        .download-options {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        
        .download-option {
            display: flex;
            align-items: center;
            padding: 15px;
            border: 1px solid #e0e0e0;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
            background: white;
        }
        
        .download-option:hover {
            border-color: #007AFF;
            background: #f5f9ff;
            transform: translateX(5px);
        }
        
        .download-icon {
            width: 24px;
            height: 24px;
            margin-right: 15px;
            background-size: cover;
        }
        
        .download-option-text {
            font-size: 16px;
            font-weight: 500;
            color: #333;
        }
        
        .close-modal {
            position: absolute;
            top: 15px;
            right: 15px;
            width: 24px;
            height: 24px;
            cursor: pointer;
            opacity: 0.5;
            transition: opacity 0.3s ease;
            font-size: 24px;
            line-height: 24px;
            text-align: center;
        }
        
        .close-modal:hover {
            opacity: 1;
        }
        
        .loading {
            display: flex;
            justify-content: center;
            padding: 20px;
        }
        
        .loading-spinner {
            width: 40px;
            height: 40px;
            border: 4px solid #f3f3f3;
            border-top: 4px solid #007AFF;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }