* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            min-height: 100vh;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
            display: flex;
            justify-content: center;
            align-items: center;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            padding: 20px;
        }
        .container {
            background: #fff;
            border-radius: 24px;
            padding: 48px 40px;
            max-width: 420px;
            width: 100%;
            text-align: center;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
        }
        .icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 24px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .icon svg {
            width: 36px;
            height: 36px;
            fill: #fff;
        }
        h1 {
            font-size: 26px;
            color: #1f2937;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .subtitle {
            color: #6b7280;
            font-size: 15px;
            margin-bottom: 32px;
        }
        .qr-wrapper {
            background: #f9fafb;
            border-radius: 16px;
            padding: 24px;
            margin-bottom: 24px;
        }
        .qr-wrapper img {
            width: 100%;
            max-width: 280px;
            height: auto;
            display: block;
            margin: 0 auto;
            border-radius: 8px;
        }
        .tips {
            background: #eff6ff;
            border-radius: 12px;
            padding: 16px 20px;
            text-align: left;
        }
        .tips-title {
            font-size: 14px;
            font-weight: 600;
            color: #1e40af;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .tips-title svg {
            width: 16px;
            height: 16px;
            fill: currentColor;
        }
        .tips ul {
            list-style: none;
            font-size: 13px;
            color: #3b82f6;
            line-height: 1.8;
        }
        .tips li::before {
            content: "•";
            margin-right: 8px;
        }
        .back-btn {
            position: fixed;
            top: 20px;
            left: 20px;
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 10px 18px;
            background: #fff;
            border-radius: 50px;
            text-decoration: none;
            color: #667eea;
            font-size: 14px;
            font-weight: 500;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            z-index: 100;
        }
        .back-btn:hover {
            background: #667eea;
            color: #fff;
        }
        .back-btn svg {
            width: 16px;
            height: 16px;
            fill: currentColor;
        }