:root {
            --primary-blue: #5B8DEF;
            --accent-orange: #FF9F43;
            --background-light: #F9FAFB;
            --card-white: #FFFFFF;
            --secondary-beige: #F4EDE4;
            --text-dark: #1F2937;
            --text-muted: #6B7280;
        }

        body {
            margin: 0;
            font-family: 'Inter', sans-serif;
            background-color: var(--background-light);
            color: var(--text-dark);
        }

        h1, h2 {
            font-family: 'Poppins', sans-serif;
        }

        h1 {
            font-size: 48px;
            font-weight: bold;
        }

        h2 {
            font-size: 32px;
            font-weight: 600;
        }

        .text-muted {
            color: var(--text-muted);
        }

        .meta {
            font-size: 14px;
            color: var(--text-muted);
        }

        /* Header */
        header {
            background-color: #FFFFFF;
            box-shadow: 0 2px 12px rgba(0,0,0,0.04);
            padding: 16px 32px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 10;
        }

        .logo {
            display: flex;
            align-items: center;
            font-weight: bold;
            font-size: 24px;
        }

        .logo-icon {
            color: var(--primary-blue);
            font-size: 32px;
            margin-right: 8px;
        }

        nav ul {
            list-style: none;
            display: flex;
            gap: 24px;
            margin: 0;
            padding: 0;
        }

        nav a {
            text-decoration: none;
            color: #374151;
            font-size: 16px;
        }

        nav a:hover {
            color: var(--primary-blue);
            text-decoration: underline;
            text-decoration-thickness: 1px;
        }

        /* Hero Section */
        #hero {
            background: linear-gradient(to bottom, #F9FAFB, #EEF2FF);
            padding: 80px 32px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .hero-content {
            max-width: 50%;
        }

        .hero-content h1 {
            margin-bottom: 16px;
        }

        .hero-content p {
            font-size: 18px;
            margin-bottom: 32px;
        }

        .cta-buttons {
            display: flex;
            gap: 16px;
        }

        .btn {
            padding: 12px 24px;
            border-radius: 12px;
            font-size: 16px;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }

        .btn-primary {
            background-color: var(--accent-orange);
            color: #FFFFFF;
            border: none;
            box-shadow: 0 2px 8px rgba(255,159,67,0.2);
        }

        .btn-secondary {
            background-color: transparent;
            color: var(--primary-blue);
            border: 2px solid var(--primary-blue);
        }

        .hero-image {
            max-width: 45%;
            border-radius: 20px;
            box-shadow: 0 8px 24px rgba(0,0,0,0.08);
            overflow: hidden;
        }

        .hero-image img {
            width: 100%;
            height: auto;
            transition: transform 0.3s;
        }

        .hero-image:hover img {
            transform: scale(1.05);
        }

        /* Featured Puzzles */
        #featured {
            padding: 64px 32px;
        }

        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }

        .puzzle-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        .puzzle-card {
            background-color: #FFFFFF;
            border-radius: 16px;
            box-shadow: 0 8px 24px rgba(0,0,0,0.06);
            overflow: hidden;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .puzzle-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 32px rgba(0,0,0,0.1);
        }

        .puzzle-image {
            position: relative;
        }

        .puzzle-image img {
            width: 100%;
            aspect-ratio: 4/3;
            object-fit: cover;
            transition: transform 0.3s;
        }

        .puzzle-card:hover .puzzle-image img {
            transform: scale(1.05);
        }

        .badge {
            position: absolute;
            top: 16px;
            right: 16px;
            background-color: #EEF2FF;
            color: var(--primary-blue);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 500;
        }

        .puzzle-info {
            padding: 16px;
        }

        .puzzle-title {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .play-btn {
            background-color: var(--accent-orange);
            color: #FFFFFF;
            border: none;
            padding: 8px 16px;
            border-radius: 8px;
            font-size: 14px;
            cursor: pointer;
            transition: background-color 0.2s;
        }

        .play-btn:hover {
            background-color: #FF851B;
        }

        /* Categories */
        #categories {
            padding: 64px 32px;
            background-color: var(--secondary-beige);
        }

        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 24px;
        }

        .category-card {
            background-color: #FFFFFF;
            border-radius: 16px;
            padding: 24px;
            text-align: center;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 8px 24px rgba(0,0,0,0.1);
        }

        .category-icon {
            font-size: 48px;
            margin-bottom: 16px;
        }

        .category-title {
            font-size: 20px;
            font-weight: 600;
        }

        /* Specific category colors */
        .cat-nature { background-color: #E6F4EA; }
        .cat-nature .category-icon { color: #2F855A; }

        .cat-animals { background-color: #FFF3E0; }
        .cat-animals .category-icon { color: #DD6B20; }

        .cat-city { background-color: #EDF2F7; }
        .cat-city .category-icon { color: #4A5568; }

        .cat-art { background-color: #F3E8FF; }
        .cat-art .category-icon { color: #805AD5; }

        .cat-vehicle { background-color: #E0F2FE; }
        .cat-vehicle .category-icon { color: #0284C7; }

        .cat-space { background-color: #0F172A; color: #FFFFFF; }
        .cat-space .category-icon { color: #E5E7EB; }

        /* Daily Puzzle */
        #daily {
            background: linear-gradient(to right, #5B8DEF, #7AA2F7);
            color: #FFFFFF;
            padding: 80px 32px;
            text-align: center;
        }

        #daily h2 {
            margin-bottom: 16px;
        }

        .timer {
            font-family: monospace;
            background-color: rgba(255,255,255,0.2);
            padding: 8px 16px;
            border-radius: 8px;
            display: inline-block;
            margin-bottom: 32px;
        }

        /* Why 300 Pieces */
        #why {
            padding: 64px 32px;
        }

        .why-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        .why-card {
            background-color: #FFFFFF;
            border-radius: 16px;
            padding: 24px;
            transition: background-color 0.2s;
        }

        .why-card:hover {
            background-color: #EEF2FF;
        }

        .why-icon {
            color: var(--primary-blue);
            font-size: 32px;
            margin-bottom: 16px;
        }

        .why-title {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        /* Footer */
        footer {
            background-color: #F3F4F6;
            color: var(--text-muted);
            padding: 32px;
            text-align: center;
            font-size: 14px;
        }

        footer a {
            color: var(--text-muted);
            text-decoration: none;
        }

        footer a:hover {
            color: var(--primary-blue);
        }

        /* Animations */
        section {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.5s, transform 0.5s;
        }

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