:root {
            --primary-orange: #FF5722;
            --primary-black: #1A1A1A;
            --primary-white: #FFFFFF;
            --bg-light: #F4F4F4;
            /* Bir tık daha karakteristik bir gri */
            --nav-transition: all 0.5s cubic-bezier(0.23, 1, 0.32, 1);
            --card-radius: 1.25rem;
            /* 20px - Edel görüntü için ideal */
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', sans-serif;
        }

        body {
            background-color: var(--bg-light);
            overflow-x: hidden;
        }

        main .problem-solution-section .cta-wrapper .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 1rem;
            text-decoration: none;
            color: var(--primary-black);
            font-weight: 800;
            text-transform: uppercase;
            font-size: 1rem;
            transition: var(--nav-transition);
            padding: 0.8rem 1.5rem;
            border-bottom: 3px solid var(--primary-orange);
        }

        main .problem-solution-section .cta-wrapper .btn-cta i {
            color: var(--primary-orange);
            transition: transform 0.3s ease;
        }

        main .problem-solution-section .cta-wrapper .btn-cta:hover {
            color: var(--primary-orange);
        }

        main .problem-solution-section .cta-wrapper .btn-cta:hover i {
            transform: translateX(8px);
        }



        /* --- SECTION GENEL (Full Viewport) --- */
        main .problem-solution-section {
            width: 100vw;
            height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            position: relative;
            padding: 2rem;
        }

        /* --- INTRO ALANI --- */
        main .problem-solution-section .solution-intro {
            text-align: center;
            max-width: 60rem;
            margin-bottom: 3rem;
        }

        main .problem-solution-section .solution-intro .giant-title {
            font-size: clamp(2rem, 5vw, 4rem);
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1;
            text-transform: uppercase;
            color: var(--primary-black);
        }

        main .problem-solution-section .solution-intro .giant-title span {
            display: block;
            font-size: 0.35em;
            letter-spacing: 0.5rem;
            color: var(--primary-orange);
            margin-top: 0.75rem;
            font-weight: 400;
        }

        main .problem-solution-section .solution-intro .description-text {
            font-size: 1.15rem;
            color: #444;
            line-height: 1.6;
            margin: 1.5rem auto 2.5rem;
            max-width: 45rem;
        }

        /* --- SERVICE GRID & EDEL CARDS --- */
        main .problem-solution-section .service-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            width: 100%;
            max-width: 85rem;
        }

        main .problem-solution-section .service-grid .s-card {
            background: var(--primary-white);
            padding: 3.5rem 2.5rem;
            border-radius: var(--card-radius);
            position: relative;
            transition: var(--nav-transition);
            border: 1px solid rgba(0, 0, 0, 0.05);
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
            box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.02);
        }

        /* Kart Hover Efekti: Edel & Industrial */
        main .problem-solution-section .service-grid .s-card:hover {
            transform: translateY(-0.75rem);
            background: var(--primary-black);
            box-shadow: 0 2rem 4rem rgba(0, 0, 0, 0.15);
        }

        /* Hoverda metinlerin renk değiştirmesi */
        main .problem-solution-section .service-grid .s-card:hover h2,
        main .problem-solution-section .service-grid .s-card:hover p {
            color: var(--primary-white);
        }

        /* sc-5 Tipografi Adaptasyonu */
        main .problem-solution-section .service-grid .sc-5 h2 {
            font-size: 1.6rem;
            font-weight: 900;
            line-height: 1.2;
            text-transform: uppercase;
            color: var(--primary-black);
            transition: color 0.3s;
        }

        main .problem-solution-section .service-grid .s-card p {
            margin-top: 1.25rem;
            font-size: 1rem;
            color: #666;
            line-height: 1.5;
            transition: color 0.3s;
        }

        /* sc-10 Çerçeve Dansı (Radius ile uyumlu) */
        main .problem-solution-section .service-grid .sc-10::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: var(--card-radius);
            border: 2px solid var(--primary-orange);
            opacity: 0;
            transform: scale(1.05);
            transition: var(--nav-transition);
        }

        main .problem-solution-section .service-grid .sc-10:hover::after {
            opacity: 1;
            transform: scale(1);
        }

        /* --- SCROLL NAVIGATION --- */
        main .problem-solution-section .scroll-nav-wrapper {
            display: flex;
            gap: 1.5rem;
            margin-top: 4rem;
        }

        main .problem-solution-section .scroll-nav-wrapper .book-link-scroll {
            position: relative;
            width: 3.5rem;
            height: 3.5rem;
            display: flex;
            justify-content: center;
            align-items: center;
            color: var(--primary-black);
            border: 1px solid rgba(0, 0, 0, 0.1);
            border-radius: 50%;
            transition: var(--nav-transition);
            background: var(--primary-white);
        }

        main .problem-solution-section .scroll-nav-wrapper .book-link-scroll:hover {
            background: var(--primary-orange);
            color: var(--primary-white);
            border-color: var(--primary-orange);
            transform: rotate(360deg);
            /* Havalı bir dönüş efekti */
        }

        /* ============================================================
   ÜBER UNS (PROBLEM-SOLUTION) RESPONSIVE
   ============================================================ */

        @media (max-width: 992px) {
            main .problem-solution-section {
                height: auto !important;
                /* Hapsolmuş boyu serbest bırak */
                min-height: 100vh;
                width: 100%;
                /* vw yerine % daha güvenlidir */
                padding: 100px 1.5rem 60px 1.5rem;
                /* Üstten header payı bırak */
                display: block;
                /* Flex'ten çıkar ki içerik doğal aksın */
            }

            main .problem-solution-section .solution-intro {
                margin-bottom: 3rem;
                text-align: left;
                /* Mobilde soldan hizalamak okumayı kolaylaştırır */
            }

            /* Kartları Alt Alta Dizme */
            main .problem-solution-section .service-grid {
                grid-template-columns: 1fr;
                /* 3 sütundan tek sütuna düş */
                gap: 1.5rem;
            }

            main .problem-solution-section .service-grid .s-card {
                padding: 2.5rem 1.5rem;
                /* İç boşlukları daralt */
            }

            /* Yazı Boyutlarını Dengele */
            main .problem-solution-section .solution-intro .giant-title {
                font-size: 2.5rem;
                /* Mobilde çok devasa olmasın */
            }

            main .problem-solution-section .solution-intro .description-text {
                font-size: 1rem;
                margin-bottom: 2rem;
            }

            /* Navigasyon Oklarını Gizle veya Küçült */
            main .problem-solution-section .scroll-nav-wrapper {
                justify-content: center;
                margin-top: 3rem;
            }
        }

        /* KÜÇÜK TELEFONLAR (480px altı) */
        @media (max-width: 480px) {
            main .problem-solution-section .solution-intro .giant-title {
                font-size: 2rem;
            }

            main .problem-solution-section .solution-intro .giant-title span {
                font-size: 0.5rem;
                /* "SUBTITLE" kısmını küçült */
                letter-spacing: 0.2rem;
            }

            main .problem-solution-section .service-grid .sc-5 h2 {
                font-size: 1.3rem;
            }

            /* CTA Butonunu tam genişlik yap */
            main .problem-solution-section .cta-wrapper .btn-cta {
                display: flex;
                justify-content: center;
                width: 100%;
            }
        }