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

        :root {
            --primary-blue: #4A90E2;
            --secondary-green: #7ED957;
            --accent-cyan: #50C9CE;
            --dark-text: #2C3E50;
            --light-text: #7F8C8D;
            --white: #FFFFFF;
            --light-bg: #F8FAFB;
        }

        html, body {
            margin: 0;
            padding: 0;
            width: 100%;
            min-height: 100%;
        }

        body {
            font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            line-height: 1.6;
            color: var(--dark-text);
            background: var(--white);
            font-weight: 400;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: 'Outfit', sans-serif;
            letter-spacing: -0.03em;
            font-weight: 700;
        }

        /* Header */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 1rem 0;
            background: linear-gradient(180deg, 
                rgba(255, 255, 255, 0.98) 0%, 
                rgba(248, 250, 251, 0.95) 100%);
            border-bottom: 1px solid rgba(74, 144, 226, 0.08);
            box-shadow: 0 1px 0 rgba(74, 144, 226, 0.06), 
                        0 8px 32px rgba(0, 0, 0, 0.04);
        }

        nav {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo-container {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            text-decoration: none;
            transition: transform 0.3s ease;
        }

        .logo-container:hover {
            transform: translateY(-2px);
        }

        .logo-wrapper {
            width: 48px;
            height: 48px;
        }

        .logo {
            width: 100%;
            height: 100%;
            object-fit: contain;
            filter: drop-shadow(0 2px 8px rgba(74, 144, 226, 0.2));
        }

        .brand-name {
            font-family: 'Outfit', sans-serif;
            font-size: 1.4rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--accent-cyan) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .back-link {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.5rem;
            background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
            color: var(--white);
            text-decoration: none;
            border-radius: 24px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all 0.3s ease;
            box-shadow: 0 4px 14px rgba(74, 144, 226, 0.35);
        }

        .back-link:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(74, 144, 226, 0.45);
        }

        /* Portfolio Hero */
        .portfolio-hero {
            padding: 160px 2rem 5rem;
            background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
            color: var(--white);
            position: relative;
            overflow: hidden;
        }

        .portfolio-hero::before {
            content: '';
            position: absolute;
            top: -20%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
            border-radius: 50%;
        }

        .portfolio-hero-content {
            max-width: 800px;
            margin: 0 auto;
            text-align: center;
            position: relative;
            z-index: 1;
        }

        .portfolio-hero h1 {
            font-size: clamp(2.5rem, 5vw, 3.5rem);
            margin-bottom: 1.2rem;
            color: var(--white);
            line-height: 1.2;
        }

        .portfolio-hero p {
            font-size: 1.2rem;
            opacity: 0.95;
            line-height: 1.7;
        }

        /* Filter Section */
        .filter-section {
            padding: 3rem 2rem 2rem;
            background: var(--white);
            border-bottom: 1px solid rgba(74, 144, 226, 0.08);
            position: sticky;
            top: 80px;
            z-index: 100;
        }

        .filter-content {
            max-width: 1200px;
            margin: 0 auto;
        }

        .filter-buttons {
            display: flex;
            justify-content: center;
            gap: 1rem;
            flex-wrap: wrap;
        }

        .filter-button {
            padding: 0.7rem 1.8rem;
            background: var(--light-bg);
            color: var(--dark-text);
            border: 1px solid rgba(74, 144, 226, 0.08);
            border-radius: 999px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: all 0.3s ease;
            font-family: 'Manrope', sans-serif;
        }

        .filter-button:hover {
            border-color: rgba(74, 144, 226, 0.2);
            transform: translateY(-2px);
        }

        .filter-button.active {
            background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
            color: var(--white);
            border-color: transparent;
            box-shadow: 0 4px 14px rgba(74, 144, 226, 0.35);
        }

        /* Portfolio Grid */
        .portfolio-section {
            padding: 4rem 2rem 6rem;
            background: var(--light-bg);
        }

        .portfolio-content {
            max-width: 1200px;
            margin: 0 auto;
        }

        .portfolio-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 2.5rem;
        }

        .portfolio-item {
            background: var(--white);
            border-radius: 28px;
            overflow: hidden;
            border: 1px solid rgba(74, 144, 226, 0.08);
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .portfolio-item:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 45px rgba(74, 144, 226, 0.15);
            border-color: rgba(74, 144, 226, 0.2);
        }

        .portfolio-image {
            width: 100%;
            height: 280px;
            background: linear-gradient(135deg, rgba(74, 144, 226, 0.1), rgba(80, 201, 206, 0.1));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 4rem;
            position: relative;
            overflow: hidden;
        }

        .portfolio-image::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .portfolio-item:hover .portfolio-image::before {
            opacity: 0.1;
        }

        .portfolio-info {
            padding: 2rem;
        }

        .portfolio-category {
            display: inline-block;
            padding: 0.4rem 1rem;
            background: linear-gradient(135deg, rgba(74, 144, 226, 0.1), rgba(80, 201, 206, 0.1));
            color: var(--primary-blue);
            border-radius: 12px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }

        .portfolio-info h3 {
            font-size: 1.5rem;
            margin-bottom: 0.8rem;
            color: var(--dark-text);
        }

        .portfolio-info p {
            color: var(--light-text);
            line-height: 1.7;
            margin-bottom: 1.5rem;
        }

        .portfolio-tags {
            display: flex;
            gap: 0.6rem;
            flex-wrap: wrap;
            margin-bottom: 1.5rem;
        }

        .portfolio-tag {
            padding: 0.3rem 0.8rem;
            background: var(--light-bg);
            color: var(--light-text);
            border-radius: 8px;
            font-size: 0.8rem;
            font-weight: 500;
        }

        .portfolio-link {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--primary-blue);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all 0.3s ease;
        }

        .portfolio-link:hover {
            gap: 0.8rem;
        }

        /* CTA Section */
        .portfolio-cta {
            padding: 5rem 2rem;
            background: var(--white);
            text-align: center;
        }

        .portfolio-cta-content {
            max-width: 700px;
            margin: 0 auto;
        }

        .portfolio-cta h2 {
            font-size: 2.3rem;
            margin-bottom: 1.2rem;
            background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .portfolio-cta p {
            font-size: 1.1rem;
            margin-bottom: 2rem;
            color: var(--light-text);
            line-height: 1.7;
        }

        .cta-button {
            display: inline-block;
            padding: 1.1rem 2.8rem;
            background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
            color: var(--white);
            text-decoration: none;
            border-radius: 999px;
            font-weight: 700;
            font-size: 1rem;
            transition: all 0.3s ease;
            box-shadow: 0 8px 24px rgba(74, 144, 226, 0.35);
        }

        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(74, 144, 226, 0.45);
        }

        /* Footer */
        footer {
            background: var(--dark-text);
            color: var(--white);
            padding: 2rem;
            text-align: center;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin-bottom: 1rem;
            flex-wrap: wrap;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.75);
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.3s ease;
        }

        .footer-links a:hover {
            color: var(--accent-cyan);
        }

        .footer-copyright {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.88rem;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .portfolio-hero {
                padding: 140px 1.5rem 4rem;
            }

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

            .filter-section {
                top: 70px;
                padding: 2rem 1.5rem 1.5rem;
            }

            .filter-buttons {
                gap: 0.7rem;
            }

            .filter-button {
                padding: 0.6rem 1.3rem;
                font-size: 0.88rem;
            }
        }