/* 1. GLOBAL & LAYOUT STYLES */
    * {
        box-sizing: border-box;
    }
    
    body {
        margin: 0;
        line-height: normal;
        font-family: 'NanumSquare', sans-serif;
        background-color: #f9f9f9;
    }

    .container-wrapper {
        width: 100%;
        position: relative;
        background-color: #fff;
    }

    .background-layer {
       display: none;
    }

    /* 2. HEADER STYLES */
    .header-desktop {
        position: sticky; /* MODIFIED */
        top: 0; /* ADDED */
        background-color: #fff;
        border-bottom: 1px solid #dcdcdc;
        box-sizing: border-box;
        width: 100%;
        height: 64px;
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: center;
        text-align: left;
        font-family: NanumSquare;
        z-index: 10;
    }
    
    .header-desktop .header-inner {
        width: 1280px;
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        padding: 0 20px;
        box-sizing: border-box;
    }
    
    .header-desktop .logo-container {
        display: flex;
        align-items: center;
        gap: 5px;
    }
    
    .header-desktop .logo-container img:first-child { 
        width: 26px; 
    }
    
    .header-desktop .nav-menu {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 16px;
    }
    
    .header-desktop .nav-item { 
        color: rgba(0, 0, 0, 0.5); 
        cursor: pointer; 
        line-height: 20px;
        font-weight: 700;
    }
    
    .header-desktop .nav-item.active { 
        color: #000; 
        font-weight: 800; 
    }
    
    .header-desktop .nav-divider { 
        color: rgba(0, 0, 0, 0.4); 
        line-height: 20px;
    }
    
    .header-desktop .menu-icon { 
        width: 32px; 
        height: 32px; 
    }

    .header-mobile {
        display: none;
    }

    /* 3. SUB HEADER STYLES */
    .sub-header-desktop {
        position: sticky; /* MODIFIED */
        top: 64px; /* ADDED */
        background-color: rgba(0, 0, 0, 0.85);
        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
        box-sizing: border-box;
        width: 100%;
        height: 50px;
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: center;
        text-align: center;
        font-size: 16px;
        color: #fff;
        font-family: NanumSquare;
        z-index: 10;
    }
    
    .sub-header-desktop .sub-header-inner {
        width: 1280px;
        display: flex;
        justify-content: right;
        align-items: center;
        gap: 40px;
        font-size: 16px;
        padding: 0 20px;
        box-sizing: border-box;
    }
    
    .sub-header-desktop .sub-nav-item { 
        cursor: pointer; 
        font-weight: 700; 
        line-height: 20px;
    }
    
    .sub-header-desktop .sub-nav-item.active { 
        color: #fae100; 
        font-weight: 800; 
    }

    .sub-header-mobile {
        display: none;
    }

    /* 4. MAIN CONTENT STYLES */
    .main-content-area-desktop {
        background-color: #fff;
    }

    .main-content-area-desktop .content-section {
        display: none;
        /* MODIFICATION: Removed width constraints for full-width background */
        padding-top: 50px;
        background-color: #f9f9f9;
        padding-bottom: 50px;
    }
    
    .main-content-area-desktop .content-section.active {
        display: block;
    }
    
    .main-content-area-desktop .section-title-container {
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 20px;
        position: relative;
        z-index: 1; 
        padding-top: 64px;
        padding-bottom: 50px;
        background-color: #fff;
    }
    
    .main-content-area-desktop .section-title { 
        font-size: 30px; 
        font-weight: 800; 
    }

    .main-content-area-desktop .guide-container {
        /* MODIFICATION: Added width/margin to center the content inside the full-width section */
        width: 1280px;
        margin: 0 auto;
        padding-left: 20px;
        padding-right: 20px;
        box-sizing: border-box;
        display: flex;
        justify-content: center;
        align-items: flex-start;
        padding-top: 73px;
        padding-bottom: 18px;
        gap: 92px;
    }

    /* 5. GUIDE COMPONENT STYLES */
    .guide-title {
        border-radius: 99px;
        background-color: #fae100;
        padding: 12px 32px;
        font-size: 24px;
        font-weight: 800;
        color: #000;
        text-align: center;
    }
    
    .steps-wrapper { 
        display: flex; 
        gap: 42px; 
    }
    
    .step-indicators { 
        position: relative; 
        width: 27px; 
    }
    
    .step-line { 
        position: absolute; 
        left: 12px; 
        width: 2px; 
        background-color: #fae100; 
        z-index: 1; 
    }
    
    .step-indicator {
        position: relative;
        width: 27px;
        height: 27px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        border: 2px solid #fae100;
        background-color: #fff;
        color: #fae100;
        font-family: 'KoPubDotum', sans-serif;
        font-weight: 700;
        font-size: 15px;
        cursor: pointer;
        z-index: 2;
    }
    
    .step-indicator.active { 
        background-color: #fae100; 
        color: #fff; 
    }
    
    .video-link {
        box-shadow: 1px 2px 4px rgba(0, 0, 0, 0.25);
        border-radius: 7px;
        background-color: #fff;
        display: flex;
        align-items: center;
        padding: 10px 20px;
        gap: 10px;
        color: #999;
        font-size: 18px;
        cursor: pointer;
    }

    /* 6. SECTION-SPECIFIC STYLES */
    /* == SECTION 1: APP INSTALL == */
    #section-app-install .guide-left { width: 388px; display: flex; flex-direction: column; align-items: center; gap: 70px; }
    #section-app-install .step-line { top: 38px; height: 445px; }
    #section-app-install .step-indicator { position: absolute; left: 0; }
    #section-app-install .step-indicator[data-step="1"] { top: 35px; }
    #section-app-install .step-indicator[data-step="2"] { top: 120px; }
    #section-app-install .step-indicator[data-step="3"] { top: 215px; }
    #section-app-install .step-indicator[data-step="4"] { top: 300px; }
    #section-app-install .step-indicator[data-step="5"] { top: 460px; }
    #section-app-install .instruction-item { 
        position: relative; 
        line-height: 30px; 
        font-size: 18px; 
        font-weight: 800; 
        color: #999; 
        cursor: pointer;
        padding: 30px 20px;
        width: 100%;
    }
    #section-app-install .sub-instructions { padding-left: 15px; margin-top: 10px; }
    
    /* App Install Section Color Logic (Desktop) */
    #section-app-install .instruction-item.active:not([data-step="4"]) {
        color: #000;
    }
    #section-app-install .instruction-item[data-step="4"].active:not(:has(.sub-instruction-item.active)) > .main-instruction-text {
        color: #000;
    }
    #section-app-install .sub-instruction-item.active {
        color: #000;
    }
    #section-app-install .instruction-item[data-step="4"].active:has(.sub-instruction-item.active) > .main-instruction-text {
        color: #999;
    }

    #section-app-install .guide-right { width: 450px; display: flex; flex-direction: column; align-items: center; gap: 20px; }
    #section-app-install .image-display { width: 100%; height: 600px; position: relative; }
    #section-app-install .step-image { width: 100%; height: 100%; object-fit: cover; position: absolute; top: 0; left: 0; display: none; }
    #section-app-install .step-image.active { display: block; }
    
    .image-annotation { 
        position: absolute; 
        font-size: 17px; 
        color: red; 
        font-weight: 700; 
        text-align: center; 
        display: none; 
        z-index: 7;
    }
    .image-annotation.active { display: block; }
    #section-app-install .image-annotation[data-annotation-for="4.1"] { width: 250px; top: 80px; left: 99px; } 
    #section-app-install .image-annotation[data-annotation-for="4.2"] { width: 297px; top: 80px; left: 99px; } 

    #section-app-install .ellipse-div {
        position: absolute;
        margin: 0 !important;
        top: 360.25px;
        left: 257px;
        width: 55px;
        height: 55px;
        border-radius: 50%;
        background-color: rgba(255, 0, 0, 0.15);
        border: 9.5px solid #ff0000;
        box-sizing: border-box;
        z-index: 6;
        display: none;
    }
    #section-app-install .step-image[data-image-for="2"].active ~ .ellipse-div {
        display: block;
    }

    .arrow-annotation-text {
        line-height: normal;
        font-weight: 800;
    }
    .arrow-1 {
        max-height: 100%;
        width: 56px;
    }
    .arrow-2 {
        max-height: 100%;
        width: 56px;
    }
    .arrow-container {
        width: 120px;
        position: relative;
        height: 30px;
        display: flex;
        align-items: center;
        gap: 7px;
    }
    .arrow-group {
        position: absolute;
        margin: 0 !important;
        display: none;
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        text-align: left;
        font-family: NanumSquare;
        color: #ff0000;
        z-index: 7;
    }
    #section-app-install .arrow-group {
        top: 460px;
        left: 298.14px;
        font-size: 14px;
        width: 120px;
    }
    #section-app-install .step-image[data-image-for="4"].active ~ .arrow-group {
        display: flex;
    }
    
    /* == SECTION 2: COUPON REGISTRATION == */
    #section-coupon .guide-container { flex-direction: row; } 
    #section-coupon .guide-left { width: 450px; position: relative; height: 600px; }
    #section-coupon .image-display { width: 100%; height: 100%; position: absolute; top: 0; left: 50%; transform: translateX(-50%); }
    #section-coupon .step-image { width: 100%; height: 100%; object-fit: contain; position: absolute; top: 0; left: 0; display: none; }
    #section-coupon .step-image.active { display: block; }
    
    #section-coupon .character-illustration { 
        position: absolute; 
        width: 220px; 
        bottom: 30px; top: 220px;
        left: -88px; 
        z-index: 5; 
        display: none; 
    }
    
    #section-coupon .step-image[data-image-for="3"].active ~ .character-illustration {
        display: block;
    }

    #section-coupon .guide-right { width: 388px; display: flex; flex-direction: column; align-items: center; gap: 80px; }
    #section-coupon .step-line { top: 30px; height: 280px; }
    #section-coupon .step-indicator { position: absolute; left: 0; margin-bottom: 73px; }
    #section-coupon .step-indicator[data-step="1"] { top: 30px; }
    #section-coupon .step-indicator[data-step="2"] { top: 123px; }
    #section-coupon .step-indicator[data-step="3"] { top: 216px; }
    #section-coupon .step-indicator[data-step="4"] { top: 300px; }
    #section-coupon .step-indicator:last-child { margin-bottom: 0; }
    #section-coupon .instruction-item { 
        padding: 30px 30px; text-align: left; width: 100%; cursor: pointer; color: #999; 
        font-weight: 800; font-size: 18px; line-height: 30px; 
    }
    /* START: FIX for Coupon section color */
    #section-coupon .instruction-item.active {
        color: #000;
    }
    /* END: FIX */
    #section-coupon .instruction-item.active::before {
        content: ''; 
        position: absolute; 
        left: -20px;
        top: 50%;
        transform: translateY(-50%); 
        width: 0; 
        height: 0;
        border-top: 15px solid transparent; 
        border-bottom: 15px solid transparent;
        border-right: 20px solid #fff;
        z-index: 1;
    }
    
    /* == SECTION 3: STICKER ATTACHMENT == */
    #section-sticker .guide-left { width: 434px; display: flex; flex-direction: column; align-items: center; gap: 70px; }
    #section-sticker .step-line { top: 30px; height: 280px; }
    #section-sticker .step-indicator { position: absolute; left: 0; margin-bottom: 80px; }
    #section-sticker .step-indicator[data-step="1"] { top: 30px; }
    #section-sticker .step-indicator[data-step="2"] { top: 123px; }
    #section-sticker .step-indicator[data-step="3"] { top: 215px; }
    #section-sticker .step-indicator[data-step="4"] { top: 300px; }
    #section-sticker .step-indicator:last-child { margin-bottom: 0; }
    #section-sticker .step-instructions { width: 363px; }
    #section-sticker .instruction-item { 
        padding: 30px 10px; cursor: pointer; color: #999; font-weight: 800; 
        font-size: 18px; line-height: 30px; width: 100%;
    }
    /* START: FIX for Sticker section color */
    #section-sticker .instruction-item.active {
        color: #000;
    }
    /* END: FIX */
    #section-sticker .instruction-item.active::before {
        content: ''; position: absolute; left: -20px; top: 50%;
        transform: translateY(-50%); width: 0; height: 0;
        border-top: 15px solid transparent; border-bottom: 15px solid transparent;
        border-right: 20px solid #fff; z-index: 1;
    }

    #section-sticker .guide-right { width: 450px; display: flex; flex-direction: column; align-items: center; gap: 40px; }
    
    #section-sticker .image-display-wrapper {
        position: relative;
        width: 400px;
        height: 400px;
    }
    #section-sticker .image-display {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #fff;
        position: relative;
        display: flex;
        align-items: center;
        justify-content: center;
        overflow: hidden;
    }
    #section-sticker .step-image {
        position: absolute;
        display: none;
        width: 100%;
        height: 100%;
        border-radius: 50%;
        object-fit: cover;
    }
    #section-sticker .step-image.active {
        display: block;
    }
    
    #section-sticker .img-0128-icon {
        width: 52%;
        position: absolute;
        margin: 0 !important;
        top: 150px;
        left: 300px;
        max-width: 100%;
        overflow: hidden;
        max-height: 100%;
        object-fit: contain;
        display: none;
        z-index: 5;
    }

    #section-sticker .icon {
        width: 55%;
        position: absolute;
        margin: 0 !important;top:200px;
        left: -61.86px;
        max-height: 100%;
        object-fit: cover;
        display: none;
        z-index: 5;
    }
    #section-sticker .icon-2 {
        width: 80%;
        position: absolute;
        margin: 0 !important;top:150px;
        left: -125.86px;
        max-height: 100%;
        object-fit: cover;
        display: none;
        z-index: 5;
    }
    
    #section-sticker .image-display-wrapper:has(.step-image[data-image-for="2"].active) .icon-2[data-overlay-for="2"] {
        display: block;
    }
    #section-sticker .image-display-wrapper:has(.step-image[data-image-for="3"].active) .icon[data-overlay-for="3"] {
        display: block;
    }
    #section-sticker .image-display-wrapper:has(.step-image[data-image-for="4"].active) .img-0128-icon[data-overlay-for="4"] {
        display: block;
    }

    /* 7. FOOTER STYLES */
    .footer-desktop { 
        width: 100%;
        background-color: #fff;
        display: flex;
        justify-content: center;
        position: relative;
        border-top: 1px solid #dcdcdc; 
        padding: 50px 0; 
        color: #585858; 
        font-size: 12px; 
    }
    
    .footer-desktop .footer-content { 
        width: 1280px;
        display: flex;
        align-items: flex-start;
        justify-content: space-between;
        padding: 0 20px;
        box-sizing: border-box;
    }
    
    .footer-desktop .company-info { 
        display: flex; 
        flex-direction: column; 
        gap: 8px; 
    }
    
    .footer-desktop .info-row, .footer-desktop .contact-row { 
        display: flex; 
        flex-wrap: wrap; 
        gap: 16px; 
    }
    
    .footer-desktop .info-item { 
        padding-right: 16px; 
        border-right: 1px solid #b9b9b9; 
    }
    
    .footer-desktop .info-item:last-child { 
        border-right: none; 
    }
    
    .footer-desktop .footer-links { 
        display: flex; 
        gap: 24px; 
        font-size: 14px; 
        font-weight: bold; 
        color: #222; 
    }
    .footer-desktop .footer-links a {
        text-decoration: none;
        color: #222;
    }
    .footer-desktop .footer-links a:hover {
        opacity: 0.7;
    }

    .footer-mobile {
        display: none;
    }

    /* 8. VIDEO MODAL STYLES */
    .video-modal {
        display: none; position: fixed; z-index: 1001; left: 0; top: 0;
        width: 100%; height: 100%; overflow: auto; background-color: rgba(0, 0, 0, 0.7);
        align-items: center; justify-content: center; opacity: 0; transition: opacity 0.3s ease;
    }
    .video-modal.active { display: flex; opacity: 1; }
    .modal-content {
        position: relative; background-color: #000; padding: 0; border-radius: 10px;
        width: 90%; max-width: 1024px; box-shadow: 0 5px 15px rgba(0,0,0,0.3); aspect-ratio: 16 / 9;
    }
    .modal-content video { width: 100%; height: 100%; border-radius: 10px; }
    .close-button {
        position: absolute; top: 0px; right: -40px; width: 32px; height: 32px;
        cursor: pointer; z-index: 10; transition: transform 0.2s ease;
        background-color: transparent; border: none;
    }
    .close-button:hover, .close-button:focus { transform: scale(1.1); }
    .play-button {
        position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); color: #fff;
        background-color: rgba(0, 0, 0, 0.7); border-radius: 50%; width: 80px; height: 80px;
        font-size: 40px; font-weight: bold; cursor: pointer; text-align: center; line-height: 80px;
        border: 3px solid #fff; transition: all 0.2s ease; z-index: 10;
        display: none; align-items: center; justify-content: center;
    }
    .play-button:hover { border-color: #fae100; transform: translate(-50%, -50%) scale(1.1); }
    .play-button:hover::after { border-left-color: #fae100; }
    .play-button::after {
        content: ''; display: block; width: 0; height: 0; border-top: 20px solid transparent;
        border-bottom: 20px solid transparent; border-left: 30px solid #fff; margin-left: 5px;
        transition: border-left-color 0.2s ease;
    }
    .modal-content .video-placeholder {
        display: none; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
        background-color: #000; border-radius: 10px;
    }
    .modal-content.video-not-started .video-placeholder { display: block; }
    .modal-content.video-not-started .play-button { display: flex; }
    .modal-content.video-not-started video { display: none; }
    
    /* 9. QR DOWNLOAD COMPONENT */
    #qr-downloads-wrapper {
        position: absolute; 
        top: -65px; 
        right: -305px; 
        z-index: 5;
        display: none; 
        flex-direction: row; 
        align-items: flex-start; 
        gap: 15px;
    }
    
    #section-app-install .step-image[data-image-for="1"].active ~ #qr-downloads-wrapper {
        display: flex;
    }

    /* 10. ACTIVE STATE STYLES FOR ALL SECTIONS */
    .instruction-item.active {
        background-color: #fff;
        border-radius: 5px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        position: relative;
        z-index: 2;
    }
    
    #section-app-install .instruction-item.active::before {
        content: ''; 
        position: absolute; 
        left: -20px;
        top: 50%;
        transform: translateY(-50%); 
        width: 0; 
        height: 0;
        border-top: 15px solid transparent; 
        border-bottom: 15px solid transparent;
        border-right: 20px solid #fff;
        z-index: 1;
    }
    
    #section-app-install .instruction-item[data-step="4"].active::before {
        top: 45px; /* Aligns triangle with the first line of text */
    }

    .main-content-area-mobile {
        display: none;
    }