:root {
        --primary-color: #f3c400;
        --primary-dark: #e0b000;
        --secondary-color: #333;
        --light-color: #f8f9fa;
        --dark-color: #212529;
        --gray-color: #6c757d;
        --border-radius: 8px;
        --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        --transition: all 0.3s ease;
    }

    * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    body {
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        line-height: 1.6;
        background-color: #f8f9fa;
        color: var(--dark-color);
        user-select: none;
        min-height: 100vh;
        padding: 2rem 0;
    }

    .container-main {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }

    header {
        text-align: center;
        margin-bottom: 2.5rem;
    }

    h1 {
        font-size: 2.75rem;
        font-weight: 800;
        margin-bottom: 1rem;
        background: linear-gradient(90deg, var(--primary-dark), var(--primary-color));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        letter-spacing: -0.02em;
    }

    .subtitle {
        color: var(--gray-color);
        font-size: 1.15rem;
        max-width: 700px;
        margin: 0 auto;
        font-weight: 400;
    }

    .content-wrapper {
        display: flex;
        flex-wrap: wrap;
        gap: 2rem;
        justify-content: center;
        align-items: flex-start;
    }

    #settings {
        flex: 1;
        min-width: 300px;
        max-width: 450px;
        background: white;
        padding: 2rem;
        border-radius: var(--border-radius);
        box-shadow: var(--box-shadow);
        border-top: 4px solid var(--primary-color);
    }

    #settings h2 {
        color: var(--secondary-color);
        margin-bottom: 1.5rem;
        font-size: 1.5rem;
        font-weight: 500;
        position: relative;
        padding-bottom: 0.5rem;
    }

    #settings h2::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 50px;
        height: 3px;
        background: var(--primary-color);
    }

    .form-group {
        margin-bottom: 1.5rem;
    }

    .form-group label {
        display: block;
        margin-bottom: 0.5rem;
        font-weight: 500;
        color: var(--dark-color);
    }

    .form-control {
        width: 100%;
        padding: 0.75rem 1rem;
        font-size: 1rem;
        border: 1px solid #ddd;
        border-radius: var(--border-radius);
        transition: var(--transition);
    }

    .form-control:focus {
        outline: none;
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(243, 196, 0, 0.2);
    }

    .btn {
        display: inline-block;
        background: var(--primary-color);
        color: var(--secondary-color);
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
        font-weight: 600;
        border: none;
        border-radius: var(--border-radius);
        cursor: pointer;
        transition: var(--transition);
        width: 100%;
        text-align: center;
    }

    .btn:hover {
        background: var(--primary-dark);
        transform: translateY(-2px);
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
    }

    .size-options {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
        margin-top: 0.5rem;
    }

    .size-option {
        position: relative;
    }

    .size-option input[type="radio"] {
        position: absolute;
        opacity: 0;
    }

    .size-option label {
        display: block;
        padding: 0.75rem 1rem;
        background: white;
        border: 1px solid #ddd;
        border-radius: var(--border-radius);
        cursor: pointer;
        transition: var(--transition);
        text-align: center;
        font-weight: 500;
    }

    .size-option input[type="radio"]:checked + label {
        background: var(--primary-color);
        border-color: var(--primary-dark);
        color: var(--secondary-color);
    }

    .size-option label:hover {
        border-color: var(--primary-color);
    }

    .file-upload-wrapper {
        position: relative;
        margin-top: 0.5rem;
    }

    .file-upload-input {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        opacity: 0;
        cursor: pointer;
        z-index: 2;
    }

    .file-upload-label {
        display: flex !important;
        align-items: center;
        padding: 0.75rem 1rem;
        background: white;
        border: 1px dashed #ddd;
        border-radius: var(--border-radius);
        transition: var(--transition);
        position: relative;
        overflow: hidden;
    }

    .file-upload-label:hover {
        border-color: var(--primary-color);
        background: rgba(243, 196, 0, 0.05);
    }

    .upload-icon {
        margin-right: 12px;
        color: var(--gray-color);
    }

    .file-upload-text {
        flex: 1;
        color: var(--gray-color);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .file-upload-button {
        background: var(--primary-color);
        color: var(--secondary-color);
        padding: 0.35rem 0.75rem;
        border-radius: 4px;
        font-weight: 500;
        font-size: 0.9rem;
        position: absolute;
        right: 12px;
        transition: var(--transition);
    }

    .file-upload-label:hover .file-upload-button {
        background: var(--primary-dark);
    }

    .file-upload-preview {
        margin-top: 0.75rem;
        display: none;
        text-align: center;
    }

    .file-upload-preview img {
        max-width: 100%;
        max-height: 100px;
        border-radius: 4px;
        border: 1px solid #eee;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .file-name {
        display: block;
        margin-top: 0.5rem;
        font-size: 0.85rem;
        color: var(--gray-color);
    }

    #qrcode-container {
        flex: 1;
        background: white;
        padding: 2rem;
        border-radius: var(--border-radius);
        box-shadow: var(--box-shadow);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        border-top: 4px solid var(--primary-color);
    }

    .qrcode-wrapper {
        position: relative;
        margin: 1rem 0;
    }

    #qrcode {
        display: block;
        margin: 0 auto;
    }

    #logo {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        max-width: 22%;
        opacity: 1;
        border-radius: 4px;
    }

    #ads {
        margin: 3rem auto 0;
        max-width: 800px;
        text-align: center;
        padding: 1rem;
        background: white;
        border-radius: var(--border-radius);
        box-shadow: var(--box-shadow);
    }

    @media (max-width: 768px) {
        .content-wrapper {
            flex-direction: column;
        }
        
        #settings, #qrcode-container {
            max-width: 100%;
            width: 100%;
        }
        
        h1 {
            font-size: 2rem;
        }

        .size-options {
            grid-template-columns: 1fr;
        }
    }