/* --- Material Design 3 Theme Variables --- */
        :root {
            /* Color Palette (Violet/Indigo Theme) */
            --md-sys-color-primary: #6750A4;
            --md-sys-color-on-primary: #FFFFFF;
            --md-sys-color-primary-container: #EADDFF;
            --md-sys-color-on-primary-container: #21005D;
            
            --md-sys-color-secondary: #625B71;
            --md-sys-color-on-secondary: #FFFFFF;
            --md-sys-color-secondary-container: #E8DEF8;
            
            --md-sys-color-tertiary: #7D5260;
            --md-sys-color-tertiary-container: #FFD8E4;

            --md-sys-color-surface: #FEF7FF;
            --md-sys-color-on-surface: #1D1B20;
            --md-sys-color-surface-variant: #E7E0EC;
            --md-sys-color-on-surface-variant: #49454F;
            
            --md-sys-color-outline: #79747E;
            --md-sys-color-background: #FEF7FF;

            /* Elevation Shadows */
            --md-sys-elevation-1: 0px 1px 2px rgba(0, 0, 0, 0.3), 0px 1px 3px 1px rgba(0, 0, 0, 0.15);
            --md-sys-elevation-2: 0px 1px 2px rgba(0, 0, 0, 0.3), 0px 2px 6px 2px rgba(0, 0, 0, 0.15);
            --md-sys-elevation-3: 0px 4px 8px 3px rgba(0, 0, 0, 0.15), 0px 1px 3px rgba(0, 0, 0, 0.3);

            /* Shape */
            --md-sys-shape-corner-large: 24px;
            --md-sys-shape-corner-medium: 16px;
            --md-sys-shape-corner-full: 9999px;
        }

        /* --- Global Styles --- */
        body {
            font-family: var(--yee-font-sans);
            background-color: var(--md-sys-color-background);
            color: var(--md-sys-color-on-surface);
            line-height: 1.6;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--yee-font-display);
            font-weight: 700;
            color: var(--md-sys-color-on-surface);
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: 0.3s;
        }

        /* --- Helper Classes --- */
        .text-primary-m3 { color: var(--md-sys-color-primary) !important; }
        .bg-surface { background-color: var(--md-sys-color-surface); }
        .bg-surface-variant { background-color: var(--md-sys-color-surface-variant); }
        
        .btn-m3-primary {
            background-color: var(--md-sys-color-primary);
            color: var(--md-sys-color-on-primary);
            border-radius: var(--md-sys-shape-corner-full);
            padding: 12px 24px;
            font-weight: 500;
            border: none;
            box-shadow: var(--md-sys-elevation-1);
            transition: background-color 0.3s ease, color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
        }
        .btn-m3-primary:hover {
            background-color: var(--md-sys-color-on-primary-container);
            color: var(--md-sys-color-primary-container);
            transform: translateY(-2px);
            box-shadow: var(--md-sys-elevation-2);
        }

        .btn-m3-secondary {
            background-color: var(--md-sys-color-secondary-container);
            color: var(--md-sys-color-on-primary-container);
            border-radius: var(--md-sys-shape-corner-full);
            padding: 12px 24px;
            font-weight: 500;
            border: none;
            transition: background-color 0.3s ease, color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
        }
        .btn-m3-secondary:hover {
            filter: brightness(0.95);
            transform: translateY(-2px);
        }

        .promo-sheet {
            position: fixed;
            right: 24px;
            bottom: 92px;
            z-index: 1045;
            width: min(380px, calc(100vw - 32px));
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
            transform: translateY(18px) scale(0.98);
            transition: opacity 0.24s ease, transform 0.24s ease, visibility 0s linear 0.24s;
        }
        .promo-sheet.is-visible {
            opacity: 1;
            visibility: visible;
            pointer-events: auto;
            transform: translateY(0) scale(1);
            transition: opacity 0.24s ease, transform 0.24s ease;
        }
        .promo-sheet-card {
            position: relative;
            overflow: hidden;
            padding: 24px 24px 20px;
            border-radius: 28px;
            border: 1px solid rgba(103, 80, 164, 0.14);
            background:
                radial-gradient(circle at top right, rgba(103, 80, 164, 0.08), transparent 42%),
                linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(248, 251, 255, 0.98));
            box-shadow: 0 24px 60px rgba(31, 27, 38, 0.16);
            backdrop-filter: blur(20px);
        }
        .promo-sheet-close {
            position: absolute;
            top: 14px;
            right: 14px;
            width: 42px;
            height: 42px;
            border: 1px solid rgba(103, 80, 164, 0.12);
            border-radius: 999px;
            background: rgba(255, 255, 255, 0.82);
            box-shadow: 0 8px 18px rgba(31, 27, 38, 0.08);
        }
        .promo-sheet-close:focus-visible {
            outline: 2px solid rgba(103, 80, 164, 0.36);
            outline-offset: 2px;
        }
        .promo-sheet-icon {
            width: 56px;
            height: 56px;
            margin: 0 auto 14px;
            border-radius: 18px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(103, 80, 164, 0.14), rgba(121, 116, 126, 0.1));
            color: var(--md-sys-color-primary);
            font-size: 1.4rem;
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6);
        }
        .promo-sheet-kicker {
            margin: 0 0 8px;
            text-align: center;
            color: var(--md-sys-color-primary);
            font-size: 0.76rem;
            font-weight: 700;
            letter-spacing: 0.14em;
            text-transform: uppercase;
        }
        .promo-sheet-title {
            margin: 0;
            text-align: center;
            font-size: 1.55rem;
            line-height: 1.18;
            letter-spacing: -0.03em;
        }
        .promo-sheet-copy {
            margin: 12px auto 0;
            max-width: 280px;
            text-align: center;
            color: var(--md-sys-color-on-surface-variant);
            font-size: 0.98rem;
            line-height: 1.62;
        }
        .promo-sheet-actions {
            display: grid;
            gap: 10px;
            margin-top: 18px;
        }
        .promo-sheet-cta {
            width: 100%;
            min-height: 52px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
        }
        .promo-sheet-cta i {
            font-size: 0.95rem;
        }
        .promo-sheet-hide {
            border: none;
            background: transparent;
            color: var(--md-sys-color-on-surface-variant);
            font-weight: 600;
            min-height: 36px;
        }
        .promo-sheet-hide:hover {
            color: var(--md-sys-color-primary);
        }
        .promo-sheet-hide:focus-visible {
            outline: 2px solid rgba(103, 80, 164, 0.28);
            outline-offset: 2px;
            border-radius: 999px;
        }
        @media (max-width: 767.98px) {
            .promo-sheet {
                left: 12px;
                right: 12px;
                bottom: calc(16px + env(safe-area-inset-bottom));
                width: auto;
            }
            .promo-sheet-card {
                padding: 22px 18px 18px;
                border-radius: 24px;
            }
            .promo-sheet-title {
                font-size: 1.38rem;
            }
            .promo-sheet-copy {
                max-width: 100%;
                font-size: 0.94rem;
            }
        }

        /* --- Loading Spinner --- */
        #spinner {
            opacity: 0;
            visibility: hidden;
            transition: opacity .5s ease-out, visibility 0s linear .5s;
            z-index: 99999;
        }
        #spinner.show {
            transition: opacity .5s ease-out, visibility 0s linear 0s;
            visibility: visible;
            opacity: 1;
        }

        /* --- Navigation --- */
        .navbar {
            transition: background-color 0.3s ease, color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
            padding: 1rem 0;
            background: rgba(254, 247, 255, 0.85); /* Glassmorphism */
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }
        .navbar-brand .brand-wordmark {
            font-size: 1.8rem;
            color: var(--md-sys-color-primary);
            margin: 0;
        }
        .nav-link {
            color: var(--md-sys-color-on-surface-variant) !important;
            font-weight: 500;
            margin-left: 15px;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--md-sys-color-primary) !important;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background-color: var(--md-sys-color-primary);
            border-radius: 2px;
        }

        /* --- Hero Section --- */
        .hero-header {
            padding: 8rem 0 4rem 0;
            background: linear-gradient(135deg, var(--md-sys-color-primary-container) 0%, var(--md-sys-color-surface) 100%);
            border-bottom-left-radius: 60px;
            border-bottom-right-radius: 60px;
            margin-bottom: 3rem;
            overflow: hidden;
        }
        .hero-title {
            color: var(--md-sys-color-on-primary-container);
            font-size: 3rem;
            line-height: 1.2;
            margin-bottom: 1.5rem;
        }
        .hero-subtitle {
            color: var(--md-sys-color-on-surface-variant);
            font-size: 1.2rem;
            font-weight: 300;
        }

        /* --- Cards (M3 Style) --- */
        .m3-card {
            background: var(--md-sys-color-surface);
            border-radius: var(--md-sys-shape-corner-large);
            padding: 2rem;
            height: 100%;
            border: 1px solid var(--md-sys-color-surface-variant);
            transition: background-color 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), border-color 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }
        .m3-card:hover {
            background: var(--md-sys-color-surface); /* Keep surface color */
            border-color: transparent;
            box-shadow: var(--md-sys-elevation-2);
            transform: translateY(-5px);
        }
        /* Highlight specific cards like in original */
        .feature-icon-box {
            width: 64px;
            height: 64px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            background: var(--md-sys-color-primary-container);
            color: var(--md-sys-color-on-primary-container);
            font-size: 1.5rem;
        }
        .feature-icon-box img {
            max-width: 40px;
            max-height: 40px;
        }

        /* --- Scroll Container (Replacing OwlCarousel) --- */
        .scroll-container-wrapper {
            position: relative;
            width: 100%;
        }
        .scroll-container {
            display: flex;
            overflow-x: auto;
            scroll-snap-type: x mandatory;
            gap: 20px;
            padding: 20px 5px;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none; /* Firefox */
        }
        .scroll-container::-webkit-scrollbar {
            display: none; /* Chrome/Safari */
        }
        .scroll-item {
            flex: 0 0 auto;
            scroll-snap-align: center;
            width: 280px; /* Adjust for screenshots */
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--md-sys-elevation-1);
            transition: transform 0.3s;
        }
        .scroll-item img {
            width: 100%;
            display: block;
        }
        .scroll-item:hover {
            transform: scale(1.02);
        }

        /* --- Review Cards --- */
        .review-card {
            background: var(--md-sys-color-surface-variant);
            border-radius: var(--md-sys-shape-corner-medium);
            padding: 1.5rem;
            margin-bottom: 1rem;
            color: var(--md-sys-color-on-surface-variant);
        }
        .review-header {
            display: flex;
            align-items: center;
            margin-bottom: 1rem;
        }
        .review-avatar {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            object-fit: cover;
            margin-right: 1rem;
        }

        /* --- Footer --- */
        .footer {
            background-color: var(--md-sys-color-on-surface);
            color: var(--md-sys-color-surface-variant);
            padding-top: 5rem;
            border-top-left-radius: 40px;
            border-top-right-radius: 40px;
        }
        .footer .footer-heading { color: var(--md-sys-color-surface); }
        .footer a { color: var(--md-sys-color-surface-variant); }
        .footer a:hover { color: var(--md-sys-color-primary-container); }
        
        .btn-social {
            width: 40px;
            height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(255,255,255,0.1);
            color: white;
            margin-right: 10px;
            transition: 0.3s;
        }
        .btn-social:hover { background: var(--md-sys-color-primary); }

        /* --- Animations --- */
        .wow { visibility: hidden; }

        @media (max-width: 991px) {
            .hero-header { padding-top: 6rem; text-align: center; }
            .hero-header img { margin-top: 2rem; max-width: 80%; }
        }
        
        /* Modal Customization */
        .modal-content {
            border-radius: 24px;
            border: none;
            box-shadow: var(--md-sys-elevation-3);
        }
        .modal-header { border-bottom: none; padding-top: 24px; padding-left: 24px; padding-right: 24px;}
        .modal-body { padding: 24px; }
        .modal-footer { border-top: none; padding-bottom: 24px; }

/* Consolidated home visual system */

        :root {
            --md-sys-color-primary: #2563eb;
            --md-sys-color-on-primary: #ffffff;
            --md-sys-color-primary-container: #e8f0ff;
            --md-sys-color-on-primary-container: #0f172a;
            --md-sys-color-secondary: #0fa5a4;
            --md-sys-color-on-secondary: #ffffff;
            --md-sys-color-secondary-container: #e7fbfb;
            --md-sys-color-on-secondary-container: #0f3d3d;
            --md-sys-color-surface: #ffffff;
            --md-sys-color-on-surface: #0f172a;
            --md-sys-color-surface-variant: #f5f7fb;
            --md-sys-color-on-surface-variant: #64748b;
            --md-sys-color-outline: #d6deeb;
            --md-sys-color-background: #f4f7fc;
            --md-sys-color-tertiary: #f59e0b;
            --md-sys-elevation-1: 0 10px 24px rgba(15, 23, 42, 0.06);
            --md-sys-elevation-2: 0 18px 42px rgba(15, 23, 42, 0.08);
            --md-sys-elevation-3: 0 28px 64px rgba(15, 23, 42, 0.12);
            --md-sys-shape-corner-large: 28px;
            --md-sys-shape-corner-medium: 20px;
            --md-sys-shape-corner-full: 9999px;
        }

        body {
            background: linear-gradient(180deg, #fbfcff 0%, #f6f8fc 48%, #eef3f9 100%);
            color: var(--md-sys-color-on-surface);
            overflow-x: hidden;
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Noto Sans KR", sans-serif;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6,
        .navbar-brand .brand-wordmark,
        .hero-title,
        .display-6 {
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Noto Sans KR", sans-serif;
            font-weight: 800;
        }

        .container-xxl {
            max-width: 1280px;
        }

        .navbar {
            padding-top: 0.9rem;
            padding-bottom: 0.9rem;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: saturate(140%) blur(14px);
            border-bottom: 1px solid rgba(214, 222, 235, 0.8);
            box-shadow: 0 8px 24px rgba(148, 163, 184, 0.08);
        }

        .navbar-brand .brand-wordmark {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: 0;
            color: #0f172a;
        }

        .navbar-toggler {
            border: 1px solid var(--md-sys-color-outline);
            border-radius: 16px;
            padding: 10px 12px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            line-height: 1;
            color: #0f172a;
            background: #ffffff;
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
        }

        .navbar.is-scrolled {
            background: rgba(255, 255, 255, 0.97);
            border-bottom-color: rgba(203, 213, 225, 0.92);
            box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
        }

        .nav-link {
            min-height: 42px;
            display: inline-flex;
            align-items: center;
            padding: 0 14px !important;
            border-radius: 999px;
            color: var(--md-sys-color-on-surface-variant) !important;
            font-weight: 700;
            font-size: 0.98rem;
            margin-left: 6px;
        }

        .lang-trigger {
            height: 52px;
            min-height: 52px;
            padding: 0 16px;
            border-radius: 999px;
            border: 1px solid rgba(214, 222, 235, 0.9);
            background: #ffffff;
            color: #0f172a;
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            line-height: 1 !important;
            text-align: center;
        }

        .lang-trigger > i,
        .lang-trigger > span {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            line-height: 1;
        }

        .nav-action-pill {
            display: inline-flex !important;
            align-items: center !important;
            justify-content: center !important;
            height: 52px;
            min-height: 52px;
            line-height: 1 !important;
            text-align: center;
            white-space: nowrap;
            box-sizing: border-box;
            padding-top: 0;
            padding-bottom: 0;
        }

        #top-privacy-btn {
            width: 184px;
            min-width: 184px;
            padding: 0 22px !important;
        }

        #top-lang-btn {
            min-width: 126px;
            padding: 0 16px !important;
        }

        .button-center-text {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            line-height: 1;
            text-align: center;
            transform: translateY(-0.5px);
        }

        .lang-trigger:hover,
        .lang-trigger:focus {
            background: #f8fbff;
            color: var(--md-sys-color-primary);
            border-color: rgba(37, 99, 235, 0.25);
            box-shadow: none;
        }

        .nav-link:hover,
        .nav-link.active {
            color: var(--md-sys-color-primary) !important;
            background: rgba(37, 99, 235, 0.08);
        }

        .btn-m3-primary {
            min-height: 52px;
            padding: 0 24px;
            border-radius: 16px;
            border: 1px solid rgba(37, 99, 235, 0.15);
            background: linear-gradient(180deg, #3b82f6 0%, #2563eb 100%);
            box-shadow: 0 10px 24px rgba(37, 99, 235, 0.18);
            color: #ffffff;
            font-size: 1rem;
            font-weight: 800;
            letter-spacing: 0;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            line-height: 1 !important;
            text-align: center;
            transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
            vertical-align: middle;
        }

        .btn-m3-primary:hover {
            background: linear-gradient(180deg, #3777f6 0%, #1f57d9 100%);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 14px 26px rgba(37, 99, 235, 0.22);
        }

        .btn-m3-secondary {
            min-height: 52px;
            padding: 0 24px;
            border: 1px solid var(--md-sys-color-outline);
            background: #ffffff;
            color: #0f172a;
            border-radius: 16px;
            box-shadow: 0 6px 16px rgba(15, 23, 42, 0.04);
            font-size: 1rem;
            font-weight: 800;
            letter-spacing: 0;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            line-height: 1 !important;
            text-align: center;
            vertical-align: middle;
        }

        .btn-m3-secondary:hover {
            background: #f8fbff;
            color: var(--md-sys-color-primary);
        }

        .hero-header {
            margin: 100px 16px 32px;
            padding: 44px 0 28px;
            border-radius: 40px;
            background:
                radial-gradient(circle at 75% 30%, rgba(37, 99, 235, 0.08), transparent 18rem),
                linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(243, 247, 255, 0.96) 100%);
            border: 1px solid rgba(214, 222, 235, 0.7);
            box-shadow: var(--md-sys-elevation-2);
        }

        .hero-header .row {
            margin-left: 0;
            margin-right: 0;
        }

        .hero-header .badge {
            background: rgba(37, 99, 235, 0.08) !important;
            color: var(--md-sys-color-primary) !important;
            border-radius: 999px;
            padding: 10px 16px !important;
            font-weight: 700;
            box-shadow: none !important;
        }

        .hero-title {
            max-width: 560px;
            font-size: 4.25rem;
            line-height: 1.06;
            letter-spacing: 0;
            color: #0f172a;
            margin-bottom: 1.2rem;
            margin-inline: auto;
            word-break: keep-all;
            text-wrap: balance;
        }

        .hero-subtitle {
            max-width: 460px;
            color: var(--md-sys-color-on-surface-variant);
            font-size: 1.08rem;
            font-weight: 500;
            line-height: 1.7;
            margin-bottom: 2rem;
            margin-inline: auto;
            word-break: keep-all;
        }

        .hero-header .position-relative {
            width: min(440px, 100%);
            margin-inline: auto;
            padding: 18px 18px 16px;
            border-radius: 36px;
            background:
                radial-gradient(circle at 30% 20%, rgba(37, 99, 235, 0.08), transparent 10rem),
                radial-gradient(circle at 80% 85%, rgba(15, 165, 164, 0.08), transparent 12rem),
                linear-gradient(180deg, rgba(243, 247, 255, 0.98), rgba(250, 252, 255, 0.92));
            box-shadow: 0 24px 70px rgba(37, 99, 235, 0.12);
        }

        .hero-header .position-relative::before,
        .hero-header .position-relative::after {
            position: absolute;
            display: grid;
            place-items: center;
            width: 72px;
            height: 72px;
            border-radius: 24px;
            background: rgba(255, 255, 255, 0.96);
            box-shadow: 0 16px 36px rgba(15, 23, 42, 0.12);
            background-color: #fff;
            background-position: center;
            background-repeat: no-repeat;
            background-size: 30px 30px, auto;
            content: "";
        }

        .hero-header .position-relative::before {
            top: 42px;
            left: -14px;
            background-image:
                url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%233b82f6' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3 6a2 2 0 0 1 2-2h4l2 2h8a2 2 0 0 1 2 2v9a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2Z'/%3E%3C/svg%3E"),
                linear-gradient(135deg, rgba(14, 165, 164, 0.12), rgba(37, 99, 235, 0.08));
        }

        .hero-header .position-relative::after {
            right: -16px;
            bottom: 56px;
            content: "\f27a";
            background:
                linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(14, 165, 164, 0.08)),
                #fff;
            color: #2563eb;
        }

        .hero-header .position-relative > img:first-child {
            position: relative;
            z-index: 2;
            width: 76%;
            margin-left: auto;
            border-radius: 30px !important;
            border: 10px solid #ffffff !important;
            box-shadow: 0 26px 56px rgba(15, 23, 42, 0.18) !important;
            transform: rotate(8deg);
        }

        .hero-header .position-relative > img:last-child {
            left: 12% !important;
            top: 16% !important;
            width: 54%;
            z-index: 1 !important;
            opacity: 0.9 !important;
            border-radius: 24px !important;
            transform: rotate(-8deg) !important;
            border: 8px solid rgba(255, 255, 255, 0.92);
            box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12) !important;
        }

        .hero-actions {
            gap: 14px;
            justify-content: center !important;
        }

        #about,
        #feature,
        #review,
        #contact {
            scroll-margin-top: 104px;
        }

        #about .row,
        .container-xxl.py-5 .row.g-5.align-items-center {
            row-gap: 24px !important;
        }

        .about-overview {
            align-items: stretch;
        }

        .about-story-card,
        .about-stat-card {
            height: 100%;
            border-radius: 32px;
            border: 1px solid rgba(214, 222, 235, 0.82);
            background: rgba(255, 255, 255, 0.96);
            box-shadow: var(--md-sys-elevation-1);
        }

        .about-story-card {
            padding: 30px 32px;
        }

        .about-story-card .eyebrow {
            font-size: 0.92rem;
            letter-spacing: 0.02em;
            color: var(--md-sys-color-primary);
            font-weight: 800;
            text-transform: uppercase;
        }

        .section-kicker {
            margin-bottom: 0.5rem;
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Noto Sans KR", sans-serif;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }

        .reviewer-name {
            color: var(--md-sys-color-on-surface);
            font-weight: 800;
            line-height: 1.35;
        }

        .about-story-layout {
            display: grid;
            grid-template-columns: minmax(0, 1fr) auto;
            gap: 22px;
            align-items: start;
        }

        .about-story-card .about-copy {
            max-width: 100%;
        }

        .about-story-card .display-6 {
            max-width: none;
            font-size: clamp(1.85rem, 2.2vw, 2.35rem);
            line-height: 1.18;
            margin-bottom: 1rem !important;
            word-break: keep-all;
            text-wrap: balance;
        }

        .about-story-card .text-muted {
            max-width: 34ch;
            font-size: 0.98rem;
            line-height: 1.72;
            word-break: keep-all;
        }

        .about-story-icon {
            width: 68px;
            height: 68px;
            border-radius: 22px;
            display: grid;
            place-items: center;
            color: var(--md-sys-color-primary);
            background: linear-gradient(180deg, rgba(37, 99, 235, 0.1), rgba(37, 99, 235, 0.04));
            margin-bottom: 1.5rem;
            font-size: 1.7rem;
        }

        .about-stat-card {
            padding: 28px 30px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .about-stat-card .stat-icon {
            font-size: 2.4rem;
            margin-bottom: 1rem;
        }

        .about-stat-card .stat-label {
            color: var(--md-sys-color-on-surface-variant);
            font-size: 0.98rem;
            font-weight: 700;
        }

        .about-stat-card .stat-value {
            font-size: clamp(2.2rem, 4vw, 3.2rem);
            line-height: 1;
            letter-spacing: -0.06em;
            font-weight: 800;
            color: var(--md-sys-color-primary);
            margin: 0.35rem 0 0.4rem;
        }

        .about-stat-card .stat-note {
            color: var(--md-sys-color-on-surface-variant);
            font-size: 0.96rem;
        }

        .about-cta {
            white-space: nowrap;
            min-width: 132px;
        }

        #about .display-6,
        #feature h2,
        #review h2,
        #contact h2 {
            font-size: clamp(2rem, 3vw, 2.8rem);
            letter-spacing: -0.05em;
        }

        #about .bg-surface-variant,
        .bg-surface-variant {
            background: rgba(245, 247, 251, 0.96) !important;
        }

        #about .bg-surface-variant {
            border-radius: 24px !important;
            border: 1px solid rgba(214, 222, 235, 0.7);
        }

        #feature {
            background: transparent !important;
        }

        .feature-heading {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 14px;
            margin-bottom: 2.6rem;
            text-align: center;
        }

        .feature-heading .feature-copy {
            max-width: 640px;
        }

        .feature-link {
            color: var(--md-sys-color-primary);
            font-weight: 700;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .apps-grid {
            display: grid;
            grid-template-columns: repeat(4, minmax(0, 1fr));
            gap: 20px;
        }

        .apps-grid > [class*="col-"] {
            width: auto;
            max-width: none;
            padding: 0;
        }

        .m3-card {
            padding: 22px 20px 18px;
            border-radius: 26px;
            border: 1px solid rgba(214, 222, 235, 0.72);
            background: rgba(255, 255, 255, 0.96);
            box-shadow: var(--md-sys-elevation-1);
            display: flex;
            flex-direction: column;
            min-height: 100%;
        }

        .m3-card:hover {
            transform: translateY(-3px);
            background: #ffffff;
            box-shadow: var(--md-sys-elevation-2);
        }

        .feature-icon-box {
            width: 62px;
            height: 62px;
            border-radius: 22px;
            margin-bottom: 1rem;
            font-size: 1.25rem;
        }

        .m3-card h4 {
            font-size: 1.04rem;
            margin-bottom: 0.5rem;
            letter-spacing: -0.03em;
            line-height: 1.32;
            min-height: 2.64em;
        }

        .m3-card p {
            font-size: 0.9rem;
            line-height: 1.58;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 1rem;
        }

        .card-link {
            color: var(--md-sys-color-primary) !important;
            text-decoration: none;
            font-size: 0.92rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            line-height: 1.2;
            margin-top: auto;
            font-weight: 800;
        }

        .card-link:hover {
            color: #1d4ed8 !important;
        }

        .scroll-container {
            gap: 16px;
            padding: 10px 6px 18px;
        }

        .section-intro {
            max-width: 680px;
            margin: 0 auto 2.4rem;
            text-align: center;
        }

        .section-intro p {
            margin: 0 auto;
            color: var(--md-sys-color-on-surface-variant);
            font-size: 1rem;
            line-height: 1.72;
            word-break: keep-all;
        }

        .showcase-shell {
            padding: 32px;
            border-radius: 34px;
            border: 1px solid rgba(214, 222, 235, 0.78);
            background: rgba(255, 255, 255, 0.96);
            box-shadow: var(--md-sys-elevation-1);
        }

        .showcase-copy {
            max-width: 360px;
        }

        .showcase-note {
            text-align: center;
            color: var(--md-sys-color-on-surface-variant);
        }

        .scroll-item {
            width: 210px;
            border-radius: 26px;
            border: 1px solid rgba(214, 222, 235, 0.9);
            background: #fff;
            box-shadow: 0 14px 32px rgba(15, 23, 42, 0.08);
        }

        .container-xxl.py-5 .row.gy-5.gx-4 .position-relative {
            border-radius: 30px !important;
            border: 1px solid rgba(214, 222, 235, 0.72);
            background: rgba(255, 255, 255, 0.98);
            box-shadow: var(--md-sys-elevation-1);
            padding-top: 5.5rem !important;
        }

        .process-card {
            position: relative;
            background: rgba(255, 255, 255, 0.98);
            border: 1px solid rgba(214, 222, 235, 0.75);
            border-radius: 30px;
            box-shadow: var(--md-sys-elevation-1);
            padding: 84px 28px 28px;
            height: 100%;
        }

        .process-badge {
            width: 82px;
            height: 82px;
            border-radius: 24px;
            position: absolute;
            top: 0;
            left: 50%;
            transform: translate(-50%, -50%);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            box-shadow: 0 18px 34px rgba(15, 23, 42, 0.14);
        }

        .download-shell {
            padding: 36px;
            border-radius: 34px;
            border: 1px solid rgba(214, 222, 235, 0.78);
            background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(243, 247, 255, 0.96));
            box-shadow: var(--md-sys-elevation-1);
        }

        .store-button {
            min-height: 72px;
            border-radius: 24px;
            border: 1px solid rgba(214, 222, 235, 0.9);
            background: #ffffff;
            box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
        }

        .store-button.store-button-dark {
            background: #0f172a;
            color: #ffffff;
            border-color: #0f172a;
        }

        .review-grid {
            row-gap: 20px;
        }

        .container-xxl.py-5 .row.gy-5.gx-4 .rounded-circle {
            width: 84px !important;
            height: 84px !important;
            box-shadow: 0 18px 34px rgba(15, 23, 42, 0.14) !important;
        }

        .review-card {
            background: rgba(255, 255, 255, 0.96);
            border: 1px solid rgba(214, 222, 235, 0.72);
            border-radius: 28px;
            box-shadow: var(--md-sys-elevation-1);
            color: var(--md-sys-color-on-surface-variant);
            padding: 26px;
        }

        .review-card p {
            margin-bottom: 0;
            line-height: 1.7;
        }

        .contact-shell,
        #contact .bg-surface-variant {
            border: 1px solid rgba(214, 222, 235, 0.72);
            border-radius: 32px !important;
            background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(244, 248, 255, 0.96)) !important;
            box-shadow: var(--md-sys-elevation-2);
        }

        .contact-shell {
            padding: 40px 36px;
        }

        .footer {
            background: linear-gradient(180deg, #152238 0%, #0f172a 100%);
            color: rgba(255, 255, 255, 0.8);
            border-top-left-radius: 42px;
            border-top-right-radius: 42px;
            margin-top: 40px;
        }

        .footer .footer-heading,
        .footer a.text-white,
        .copyright a {
            color: #ffffff !important;
        }

        .footer a {
            color: rgba(255, 255, 255, 0.78);
        }

        .footer a:hover {
            color: #d9e6ff;
        }

        .footer-brand {
            font-size: 1.85rem;
            font-weight: 800;
            letter-spacing: -0.04em;
        }

        .btn-social {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .btn-social:hover {
            background: rgba(37, 99, 235, 0.9);
        }

        .modal-content {
            border-radius: 28px;
            overflow: hidden;
        }

        .bg-primary-m3 {
            background: linear-gradient(180deg, #3775f6 0%, var(--md-sys-color-primary) 100%) !important;
        }

        .text-primary-m3 {
            color: var(--md-sys-color-primary) !important;
        }

        .mobile-tabbar {
            position: fixed;
            left: 16px;
            right: 16px;
            bottom: 16px;
            z-index: 1040;
            display: none;
            grid-template-columns: repeat(5, minmax(0, 1fr));
            align-items: center;
            gap: 4px;
            padding: 10px 12px;
            border: 1px solid rgba(214, 222, 235, 0.86);
            border-radius: 28px;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(16px);
            box-shadow: 0 18px 42px rgba(15, 23, 42, 0.16);
        }

        .mobile-tabbar a {
            min-width: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            color: #64748b;
            text-decoration: none;
            font-size: 0.78rem;
            font-weight: 700;
            line-height: 1.15;
            overflow: hidden;
        }

        .mobile-tabbar a i {
            font-size: 1rem;
        }

        .mobile-tabbar a.active,
        .mobile-tabbar a:hover {
            color: var(--md-sys-color-primary);
        }

        @media (max-width: 991px) {
            .navbar {
                left: 0;
                right: 0;
                width: 100vw;
                max-width: 100vw;
                padding-left: 16px !important;
                padding-right: 16px !important;
            }

            .navbar .container-xxl {
                display: flex;
                align-items: center;
                justify-content: space-between;
                gap: 12px;
                position: relative;
                width: 100%;
                max-width: 100%;
                padding-left: 0;
                padding-right: 0;
            }

            .navbar-brand {
                min-width: 0;
                padding-right: 58px;
            }

            .navbar-brand .brand-wordmark {
                font-size: 1.78rem;
            }

            .navbar-toggler {
                display: inline-flex !important;
                width: 48px;
                height: 48px;
                margin-left: 0;
                flex: 0 0 auto;
                position: absolute;
                top: 50%;
                right: 0;
                transform: translateY(-50%);
                z-index: 2;
            }

            .navbar-toggler .fa {
                color: #0f172a;
                font-size: 1.1rem;
                line-height: 1;
            }

            .hero-header {
                margin-inline: 12px;
                padding-top: 36px;
                text-align: left;
            }

            .hero-header .position-relative {
                margin-top: 22px;
                width: min(360px, 100%);
            }

            .hero-header .position-relative > img:first-child {
                width: 72%;
            }

            .hero-header .position-relative > img:last-child {
                width: 52%;
                left: 10% !important;
            }

            .about-story-card,
            .about-stat-card {
                border-radius: 28px;
            }

            .about-story-card {
                padding: 26px;
            }

            .about-story-layout {
                grid-template-columns: 1fr;
            }

            .feature-heading {
                flex-direction: column;
                align-items: center;
            }

            .apps-grid {
                grid-template-columns: repeat(3, minmax(0, 1fr));
            }

            .showcase-shell,
            .download-shell,
            .contact-shell {
                padding: 28px;
            }

            .navbar-collapse {
                margin-top: 14px;
                padding: 16px;
                border-radius: 24px;
                background: rgba(255, 255, 255, 0.98);
                border: 1px solid rgba(214, 222, 235, 0.9);
                box-shadow: var(--md-sys-elevation-1);
                width: 100%;
                max-width: 100%;
            }

            .navbar-nav {
                gap: 8px;
            }

            .nav-link {
                justify-content: flex-start;
                margin-left: 0;
            }
        }

        @media (max-width: 767px) {
            body {
                padding-bottom: 108px;
            }

            .hero-header {
                margin-top: 84px;
                border-radius: 30px;
                padding-bottom: 18px;
            }

            .hero-title {
                max-width: 272px;
                margin-inline: auto;
                font-size: clamp(1.9rem, 8.2vw, 2.18rem);
                line-height: 1.16;
                padding-inline: 0;
            }

            .hero-subtitle {
                max-width: 286px;
                margin-inline: auto;
                font-size: 0.96rem;
                line-height: 1.68;
            }

            .hero-actions {
                flex-direction: column;
                align-items: stretch !important;
                gap: 12px;
                width: 100%;
                max-width: 286px;
                margin-inline: auto;
            }

            .hero-header .btn {
                width: 100%;
            }

            .hero-header .position-relative {
                width: min(310px, 100%);
                padding: 18px 10px;
                border-radius: 28px;
            }

            .hero-header .position-relative::before,
            .hero-header .position-relative::after {
                width: 54px;
                height: 54px;
                border-radius: 18px;
            }

            .m3-card,
            .review-card,
            #contact .bg-surface-variant,
            .about-story-card,
            .about-stat-card {
                border-radius: 24px;
            }

            .scroll-item {
                width: 164px;
            }

            .apps-grid {
                grid-template-columns: repeat(2, minmax(0, 1fr));
                gap: 14px;
            }

            .section-intro {
                margin-bottom: 2rem;
            }

            .showcase-shell,
            .download-shell,
            .contact-shell {
                padding: 22px 20px;
                border-radius: 28px;
            }

            .m3-card {
                padding: 18px 16px 16px;
            }

            .m3-card h4 {
                font-size: 1rem;
            }

            .footer {
                border-top-left-radius: 30px;
                border-top-right-radius: 30px;
            }

            .mobile-tabbar {
                display: grid;
                left: 16px;
                right: auto;
                width: calc(100vw - 32px);
                max-width: calc(100vw - 32px);
            }

            .mobile-tabbar a span {
                max-width: 100%;
                overflow: hidden;
                text-overflow: ellipsis;
                white-space: nowrap;
            }

            .back-to-top {
                bottom: 96px !important;
            }

            .process-card {
                border-radius: 24px;
                padding: 78px 22px 24px;
            }
        }
    

/* Round 2: native dialog, local animations and adaptive spacing */
.promo-sheet {
    inset: auto 24px 92px auto;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    opacity: 0;
    visibility: visible;
    pointer-events: none;
    transform: translateY(18px) scale(.98);
    transition: opacity .2s ease, transform .2s ease;
}

.promo-sheet[open] {
    display: block;
}

.promo-sheet[open].is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: none;
}

.promo-sheet::backdrop {
    background: rgb(15 23 42 / 20%);
    backdrop-filter: blur(2px);
    opacity: 0;
    transition: opacity .2s ease;
}

.promo-sheet.is-visible::backdrop {
    opacity: 1;
}

.animate__animated {
    animation-duration: .72s;
    animation-fill-mode: both;
    animation-timing-function: cubic-bezier(.2,.8,.2,1);
}

.animate__fadeInDown { animation-name: yee-fade-down; }
.animate__fadeInUp { animation-name: yee-fade-up; }
.animate__zoomIn { animation-name: yee-zoom-in; }

@keyframes yee-fade-down {
    from { opacity: 0; transform: translate3d(0,-20px,0); }
    to { opacity: 1; transform: none; }
}

@keyframes yee-fade-up {
    from { opacity: 0; transform: translate3d(0,20px,0); }
    to { opacity: 1; transform: none; }
}

@keyframes yee-zoom-in {
    from { opacity: 0; transform: scale(.94); }
    to { opacity: 1; transform: none; }
}

.section-intro,
.feature-heading {
    max-width: 760px;
    margin-inline: auto;
}

@media (max-width: 767.98px) {
    .promo-sheet {
        inset: auto 12px calc(16px + env(safe-area-inset-bottom)) 12px;
        width: auto;
        max-height: calc(100dvh - 32px - env(safe-area-inset-top) - env(safe-area-inset-bottom));
        overflow: auto;
        overscroll-behavior: contain;
    }
}

@media (max-height: 620px) and (orientation: landscape) {
    .promo-sheet {
        bottom: 10px;
        max-height: calc(100dvh - 20px);
    }

    .promo-sheet-card {
        padding-block: 16px;
    }

    .promo-sheet-icon {
        width: 44px;
        height: 44px;
        margin-bottom: 8px;
    }
}


/* Non-native dialog fallback for older Android WebViews. */
body.yee-dialog-fallback-open::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 1044;
    background: rgb(15 23 42 / 20%);
    backdrop-filter: blur(2px);
}

body.yee-dialog-fallback-open .promo-sheet[open] {
    z-index: 1045;
}