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

        :root {
            --eggshell: #FBF9F6;
            --dark-gray: #1C1C1C;
            --medium-gray: #6B6B6B;
            --light-gray: #E5E5E5;
            --accent-color: #FF6B35;
        }
        
        html {
            font-size: clamp(16px, 1.2vw, 20px);
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background-color: var(--eggshell);
            color: var(--dark-gray);
            line-height: 1.6;
            overflow-x: hidden;
        }


        /* Hero Section */
        .project-hero {
            position: relative;
            width: 100vw;
            left: 50%;
            right: 50%;
            margin-left: -50vw;
            margin-right: -50vw;
            height: 80vh;
            aspect-ratio: 1/1;
            background: linear-gradient(135deg, var(--accent-color), #FF8A65);
            display: flex;
            align-items: flex-end;
            justify-content: flex-start;
            overflow: hidden;
        }

        .hero-image {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: 1;
        }

        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 2;
            background-size: cover;
            background-position: center
        }

        .hero-title {
            position: relative;
            z-index: 3;
            color: white;
            font-size: clamp(2rem, 6vw, 4rem);
            font-weight: 700;
            line-height: 1.2;
            padding: clamp(2rem, 4vw, 4rem);
            max-width: 50%;
        }


        /* Header */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: var(--eggshell);
            z-index: 50;
            padding: clamp(1rem, 2vw, 1.5rem) clamp(1rem, 4vw, 3rem);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--light-gray);
            transition: opacity 0.3s ease;
        }

        header.scrolled {
            opacity: 0.8;
        }

        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 75rem;
            margin: 0 auto;
            width: 100%;
        }

        .logo {
            font-size: clamp(1.25rem, 2.5vw, 1.5rem);
            font-weight: 600;
            color: var(--dark-gray);
            text-decoration: none;
        }

        .language-switch {
            font-size: clamp(1rem, 1.5vw, 1.125rem);
            font-weight: 500;
            color: var(--dark-gray);
            text-decoration: none;
            transition: all 0.3s ease;
            padding: 0.5rem 1rem;
            min-height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .language-switch:hover,
        .language-switch:focus {
            color: var(--accent-color);
            outline: none;
            transform: translateY(-1px);
        }

        main {
            margin-top: clamp(4rem, 6vw, 6rem);
        }

        section {
            padding: clamp(5rem, 10vw, 8rem) 0;
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease-out, transform 0.8s ease-out;
        }

        section.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .content-container {
            max-width: 1100px;
            margin-left: auto;
            margin-right: auto;
            padding: 0 clamp(2rem, 5vw, 4rem);
        }

        .hero-section {
            position: relative;
            width: 100vw;
            left: 50%;
            right: 50%;
            margin-left: -50vw;
            margin-right: -50vw;
            height: 70vh;
            background: linear-gradient(135deg, #1C1C1C, #3A3A3A);
            display: flex;
            align-items: flex-end;
            justify-content: flex-start;
            overflow: hidden;
            padding: 0;
            opacity: 1;
            transform: none;
        }

        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to top, rgba(0,0,0,0.7), rgba(0,0,0,0.2));
            z-index: 2;
        }

        .hero-title {
            position: relative;
            z-index: 3;
            color: #1c1c1c;
            font-size: clamp(2rem, 5vw, 3.5rem);
            font-weight: 700;
            line-height: 1.2;
            padding-bottom: clamp(2rem, 4vw, 4rem);
            max-width: 80%;
        }

        .hero-content {
            max-width: 1100px;
            margin: 0 auto;
            padding: clamp(3rem, 6vw, 5rem) clamp(2rem, 5vw, 4rem);
        }

        .hero-subline {
            font-size: clamp(1.25rem, 2.5vw, 1.75rem);
            line-height: 1.4;
            color: var(--medium-gray);
            max-width: 900px;
            margin-bottom: 3rem;
        }

        .project-facts {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            padding: 2rem 0;
            border-top: 1px solid var(--light-gray);
            border-bottom: 1px solid var(--light-gray);
        }

        .fact-item {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .fact-label {
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            color: var(--medium-gray);
        }

        .fact-value {
            font-size: 1rem;
            color: var(--dark-gray);
            line-height: 1.5;
        }

        /* Comparison Table */
        .comparison {
            display: grid;
            grid-template-columns: 1fr;
            gap: calc(var(--spacing-unit) * 6);
            margin: calc(var(--spacing-unit) * 8) 0;
        }

        @media (min-width: 768px) {
            .comparison {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        .comparison__item {
            border: 1px solid var(--color-border);
            padding: 0;
        }

        .comparison__title {
            font-size: 1.125rem;
            font-weight: 500;
            margin-bottom: 0.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px;
            border-color:  var(--dark-gray);
        }

        .comparison__list {
            list-style: none;
        }

        .comparison__list li {
            padding-bottom: 0.5rem;
            padding-top: 0.5rem;
            border-bottom: 1px solid  var(--light-gray);
            font-size: 0.9375rem;
            color:  var(--dark-gray);
            display: flex;
            justify-content: space-between;
        }

        .comparison__list li:last-child {
            border-bottom: none;
        }

        .comparison__total {
            font-weight: 500;
            color: var(--color-text);
            font-size: 1.125rem;
            padding-top: 0.5rem;
            margin-top: 0.5rem;
            border-top: 1px solid  var(--dark-gray);
        }

        

        .visual-placeholder {
            width: 100%;
            aspect-ratio: 4/3;
            background: linear-gradient(135deg, var(--light-gray), #d5d5d5);
            /*! border-radius: 0.5rem; */
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--medium-gray);
            font-size: 1rem;
            font-weight: 500;
            margin-top: 3rem 0;
        }

        .section-header {
            margin-bottom: 3rem;
        }

        .section-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1rem;
            color: var(--dark-gray);
        }

        .section-subtitle {
            font-size: clamp(1.125rem, 2vw, 1.5rem);
            line-height: 1.4;
            color: var(--medium-gray);
            max-width: 800px;
        }

        .text-block {
            font-size: clamp(1rem, 1.75vw, 1.25rem);
            line-height: 1.7;
            color: var(--medium-gray);
            max-width: 800px;
            margin-bottom: 2rem;
        }

        .text-block strong {
            color: var(--dark-gray);
            font-weight: 600;
        }

        .text-sub {
            font-size: clamp(0.5rem, 1vw, 1rem);
            line-height: 1.7;
            color: var(--medium-gray);
            max-width: 800px;
            margin-top: 1rem;
            margin-bottom: 3rem;
        }

        .highlight-box {
            background: white;
            padding: 2rem;
            border-left: 3px solid var(--dark-gray);
            margin: 3rem 0;
        }

        .highlight-title {
            font-size: 1rem;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            color: var(--medium-gray);
            margin-bottom: 1rem;
        }

        .highlight-content {
            font-size: clamp(1.125rem, 2vw, 1.5rem);
            font-weight: 600;
            color: var(--dark-gray);
            line-height: 1.4;
        }

        .insight-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }

        .insight-card {
            padding: 2rem;
            background: white;
            border-radius: 0.5rem;
            border-top: 3px solid var(--dark-gray);
        }

        .insight-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--light-gray);
            margin-bottom: 1rem;
        }

        .insight-title {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--dark-gray);
            margin-bottom: 0.75rem;
        }

        .insight-description {
            font-size: 0.9375rem;
            color: var(--medium-gray);
            line-height: 1.6;
        }

        .pain-points-list {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
            margin: 3rem 0;
        }

        .pain-point {
            padding: 1.5rem;
            background: white;
            border-radius: 0.5rem;
            border-left: 3px solid #FF6B35;
        }

        .pain-point-title {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--dark-gray);
            margin-bottom: 0.5rem;
        }

        .pain-point-description {
            font-size: 0.9375rem;
            color: var(--medium-gray);
            line-height: 1.6;
        }

        .competitor-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }

        .competitor-card {
            padding: 2rem;
            background: white;
            border-radius: 0.5rem;
        }

        .competitor-name {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--dark-gray);
            margin-bottom: 1rem;
        }

        .competitor-rating {
            font-size: 0.875rem;
            color: var(--medium-gray);
            line-height: 1.8;
        }

        .rating-item {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.5rem;
        }

        .rating-stars {
            color: #FFB800;
        }

        .design-principles {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }

        .principle-card {
            padding: 2rem;
            background: white;
            border-radius: 0.5rem;
            border-top: 3px solid var(--dark-gray);
        }

        .principle-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--light-gray);
            margin-bottom: 1rem;
        }

        .principle-title {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--dark-gray);
            margin-bottom: 0.75rem;
        }

        .principle-description {
            font-size: 0.9375rem;
            color: var(--medium-gray);
            line-height: 1.6;
        }


        .persona-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }

        .persona-card {
            padding: 2rem;
            background: white;
            border-radius: 0.5rem;
        }

        .persona-name {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--dark-gray);
            margin-bottom: 0.5rem;
        }

        .persona-type {
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            color: var(--medium-gray);
            margin-bottom: 1rem;
        }

        .persona-goal {
            font-size: 0.9375rem;
            color: var(--medium-gray);
            line-height: 1.6;
        }

        .funnel-diagram {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
            margin: 3rem 0;
        }

        .funnel-stage {
            padding: 1.5rem;
            background: white;
            border-radius: 0.5rem;
            border-left: 3px solid var(--light-gray);
            transition: border-color 0.3s ease;
        }

        .funnel-stage:hover {
            border-left-color: var(--dark-gray);
        }

        .funnel-label {
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            color: var(--medium-gray);
            margin-bottom: 0.5rem;
        }

        .funnel-title {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--dark-gray);
            margin-bottom: 0.5rem;
        }

        .funnel-description {
            font-size: 0.9375rem;
            color: var(--medium-gray);
            line-height: 1.6;
        }

        .image-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
            margin: 3rem 0;
        }

        .result-stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
            padding: 3rem 0;
            border-top: 1px solid var(--light-gray);
            border-bottom: 1px solid var(--light-gray);
        }

        .stat-item {
            text-align: center;
        }

        .stat-value {
            font-size: clamp(2.5rem, 5vw, 4rem);
            font-weight: 700;
            background: linear-gradient(to bottom, #8B5CF6, #EC4899);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 0.5rem;
        }

        .stat-label {
            font-size: 1rem;
            color: var(--medium-gray);
        }

        /* Footer */
        footer {
            background: var(--dark-gray);
            color: var(--eggshell);
            padding: clamp(1.5rem, 3vw, 3rem) clamp(1rem, 2vw, 2rem);
            text-align: center;
        }

        .footer-content {
            max-width: 75rem;
            margin: 0 auto;
            font-size: clamp(0.875rem, 1.125vw, 1rem);
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }

            .mobile-menu-toggle {
                display: block;
            }

            .hero-title {
                max-width: 95%;
            }

            .image-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            section {
                opacity: 1 !important;
                transform: translateY(0) !important;
            }
        }

        /* Interactive Device Mockup */
        .device-container {
            margin-top: 4rem;
        }

        .mockup-title {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            text-align: center;
            margin-bottom: 2rem;
            color: var(--dark-gray);
        }

        /* Device Toggle Switch */
        .device-toggle-container {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 1rem;
            margin-bottom: 3rem;
        }

        .device-toggle {
            display: flex;
            background: var(--light-gray);
            border-radius: 50px;
            padding: 4px;
            position: relative;
        }

        .toggle-option {
            padding: 0.75rem 2rem;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 500;
            font-size: 0.9375rem;
            color: var(--medium-gray);
            border: none;
            background: transparent;
            position: relative;
            z-index: 2;
        }

        .toggle-option:hover {
            color: var(--dark-gray);
        }

        .toggle-option.active {
            color: white;
        }

        .toggle-slider {
            position: absolute;
            top: 4px;
            left: 4px;
            height: calc(100% - 8px);
            width: calc(50% - 4px);
            background: var(--dark-gray);
            border-radius: 50px;
            transition: transform 0.3s ease;
            z-index: 1;
        }

        .toggle-slider.mobile {
            transform: translateX(100%);
        }

        /* Device Label */
        .device-label {
            font-size: 0.875rem;
            color: var(--medium-gray);
            text-transform: uppercase;
            letter-spacing: 0.1em;
        }

        /* MacBook Mockup (Desktop/Tablet) */
        .macbook-mockup {
            display: block;
            max-width: 1200px;
            margin: 0 auto;
            position: absolute;
            left: 50%;
            top: 0;
            transform: translateX(-50%);
            transition: opacity 0.4s ease, transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
            width: 100%;
        }

        .macbook-mockup.hidden {
            opacity: 0;
            transform: translateX(-50%) scale(0.3);
            pointer-events: none;
        }

        .macbook-mockup.morphing {
            transition: opacity 0.3s ease, transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
        }

        .macbook-frame {
            background: #1C1C1C;
            border-radius: 12px;
            padding: 12px 12px 0;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        }

        .macbook-screen {
            background: #000;
            border-radius: 4px;
            overflow: hidden;
            position: relative;
            aspect-ratio: 16/10;
        }

        .macbook-notch {
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 150px;
            height: 24px;
            background: #1C1C1C;
            border-radius: 0 0 12px 12px;
            z-index: 10;
        }

        .macbook-content {
            width: 100%;
            height: 100%;
            overflow-y: scroll;
            overflow-x: hidden;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: thin;
            scrollbar-color: #666 #333;
        }

        .macbook-content::-webkit-scrollbar {
            width: 8px;
        }

        .macbook-content::-webkit-scrollbar-track {
            background: #333;
        }

        .macbook-content::-webkit-scrollbar-thumb {
            background: #666;
            border-radius: 4px;
        }

        .macbook-content::-webkit-scrollbar-thumb:hover {
            background: #888;
        }

        .macbook-image {
            width: 100%;
            height: auto;
            display: block;
        }

        .macbook-base {
            height: 20px;
            background: linear-gradient(to bottom, #2A2A2A, #1C1C1C);
            border-radius: 0 0 12px 12px;
            position: relative;
        }

        .macbook-base::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 8px;
            background: #1C1C1C;
            border-radius: 0 0 50% 50%;
            box-shadow: 0 4px 10px rgba(0,0,0,0.2);
        }

        /* iPhone Mockup (Mobile) */
        .iphone-mockup {
            display: block;
            max-width: 375px;
            margin: 0 auto;
            position: relative;
            transition: opacity 0.3s ease, transform 0.3s ease;
        }

        .iphone-mockup.hidden {
            opacity: 0;
            transform: scale(0.95);
            pointer-events: none;
            position: absolute;
            left: 50%;
            transform: translateX(-50%) scale(0.95);
        }

        .iphone-frame {
            background: #1C1C1C;
            border-radius: 50px;
            padding: 14px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
            position: relative;
        }

        .iphone-notch {
            position: absolute;
            top: 14px;
            left: 50%;
            transform: translateX(-50%);
            width: 120px;
            height: 30px;
            background: #000;
            border-radius: 0 0 20px 20px;
            z-index: 10;
        }

        .iphone-screen {
            background: #000;
            border-radius: 36px;
            overflow: hidden;
            position: relative;
            aspect-ratio: 9/19.5;
        }

        .iphone-content {
            width: 100%;
            height: 100%;
            overflow-y: scroll;
            overflow-x: hidden;
            -webkit-overflow-scrolling: touch;
        }

        .iphone-content::-webkit-scrollbar {
            display: none;
        }

        .iphone-image {
            width: 100%;
            height: auto;
            display: block;
        }

        /* Placeholder for image upload */
        .mockup-placeholder {
            width: 100%;
            height: 2000px;
            background: linear-gradient(to bottom, #f5f5f5, #e0e0e0);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 1rem;
            color: var(--medium-gray);
            font-size: 1rem;
            text-align: center;
            padding: 2rem;
        }

        .placeholder-icon {
            font-size: 3rem;
            color: var(--light-gray);
        }

        /* Responsive behavior */
        @media (max-width: 768px) {
            .mockup-placeholder {
                height: 3000px;
            }

            .toggle-option {
                padding: 0.625rem 1.5rem;
                font-size: 0.875rem;
            }
        }

        /* Mockup container for positioning */
        .mockup-display {
            position: relative;
            min-height: 600px;
            display: flex;
            align-items: flex-start;
            justify-content: center;
        }

        /* Scroll hint */
        .scroll-hint {
            text-align: center;
            margin-top: 2rem;
            color: var(--medium-gray);
            font-size: 0.875rem;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .scroll-hint::before {
            content: '↕';
            font-size: 1.25rem;
        }