/* Base styles */
        html, body {
            margin: 0;
            padding: 0;
            height: 100%;
            overflow-x: hidden;
            -webkit-text-size-adjust: 100%;
        }

        body::before {
            content: "";
            position: fixed;
            inset: 0;
            background: url("../images/bg.png") center/cover no-repeat;
            z-index: -1;
        }

        * {
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
        }

        /* Layout container */
        #app {
            margin: 0 auto;
        }

        /* Topbar styles */
        .topbar {
            position: sticky;
            top: 0;
            z-index: 10;
            background: #fff;
            padding: 10px;
            border-bottom: 1px solid rgba(0, 0, 0, 0.08);
            border-radius: 0 0 12px 12px;
        }

        .back-btn {
            display: inline-block;
            background: #000;
            color: #fff;
            border-radius: 999px;
            padding: 8px 14px;
            font-size: 14px;
            text-decoration: none;
            transition: transform 0.08s ease;
        }

        .back-btn:active {
            transform: scale(0.97);
        }

        /* Main content styles */
        .wrap {
            padding: 14px 10px;
        }

        .title-big {
            text-align: center;
            font-size: 22px;
            font-weight: 800;
            margin: 16px 0 8px;
            color: #222;
            text-shadow: 0 1px 0 rgba(255, 255, 255, 0.6);
        }

        .title-sub {
            text-align: center;
            font-size: 16px;
            color: #ff0000;
            font-weight: bold;
            margin: 20px 0;
            text-shadow: 0 1px 0 rgba(255, 255, 255, 0.6);
        }

        .content-image {
            width: 100%;
            display: block;
            border-radius: 8px;
            background: #f5f5f5;
            margin: 20px 0;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
        }

        .footer {
            text-align: center;
            font-size: 12px;
            color: #333;
            padding: 16px 0 24px;
            text-shadow: 0 1px 0 rgba(255, 255, 255, 0.6);
        }

        /* Responsive design */
        @media (max-width: 767.98px) {
            html, body {
                width: 100vw;
                max-width: 100vw;
                overflow-x: hidden;
            }
            
            #app {
                width: 100%;
                max-width: 100%;
                padding: 0 10px;
                box-sizing: border-box;
            }
            
            body {
                touch-action: pan-y;
            }
            
            .wrap {
                margin: 14px 0;
                padding: 14px 0;
            }
            
            .content-image {
                max-width: 100%;
                height: auto;
            }
            
            * {
                max-width: 100%;
                box-sizing: border-box;
            }
        }

        @media (min-width: 768px) {
            #app {
                width: 80%;
                max-width: 1200px;
            }
        }