*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
            background: #f8f7f4;
            color: #1e2a3a;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            color: #1a6b8a;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #0d3e52;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        h1,
        h2,
        h3,
        h4 {
            font-weight: 600;
            line-height: 1.3;
            letter-spacing: -0.01em;
            color: #0f2a3f;
        }
        h1 {
            font-size: 2.4rem;
            margin: 0 0 0.5rem;
        }
        h2 {
            font-size: 1.8rem;
            margin: 2.5rem 0 1rem;
            border-left: 6px solid #e67e22;
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.35rem;
            margin: 1.8rem 0 0.8rem;
            color: #1e4a5f;
        }
        h4 {
            font-size: 1.1rem;
            margin: 1.2rem 0 0.5rem;
            color: #2c5f73;
        }
        p {
            margin: 0 0 1.2rem;
            font-size: 1.05rem;
        }
        ul,
        ol {
            margin: 0 0 1.5rem 1.8rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        .container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 0.5rem;
        }
        header {
            background: linear-gradient(145deg, #ffffff, #f1efe9);
            border-radius: 0 0 24px 24px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
            padding: 1rem 1.5rem;
            margin: 0 -1rem;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(6px);
        }
        .header-inner {
            max-width: 1140px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, #1a4a5e, #e67e22);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .my-logo i {
            -webkit-text-fill-color: #e67e22;
            font-size: 1.8rem;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.85;
        }
        nav {
            display: flex;
            align-items: center;
            gap: 0.3rem;
            flex-wrap: wrap;
        }
        nav a {
            padding: 0.5rem 1rem;
            border-radius: 40px;
            font-weight: 500;
            font-size: 0.92rem;
            color: #1e2a3a;
            transition: background 0.2s, color 0.2s;
        }
        nav a:hover {
            background: #e67e22;
            color: #fff;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.7rem;
            background: none;
            border: none;
            color: #1e2a3a;
            cursor: pointer;
            padding: 0.2rem 0.6rem;
            border-radius: 8px;
        }
        .hamburger:hover {
            background: rgba(0, 0, 0, 0.05);
        }
        #nav-toggle {
            display: none;
        }
        #nav-toggle:checked~.nav-links {
            display: flex;
            flex-direction: column;
            width: 100%;
            margin-top: 1rem;
            gap: 0.2rem;
        }
        .nav-links {
            display: flex;
            gap: 0.3rem;
            flex-wrap: wrap;
        }
        .breadcrumb {
            padding: 0.8rem 0 0.2rem;
            font-size: 0.85rem;
            color: #5a6a7a;
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.6rem;
            max-width: 1140px;
            margin: 0 auto;
        }
        .breadcrumb a {
            color: #1a6b8a;
        }
        .breadcrumb span {
            color: #8a9aa8;
        }
        .hero {
            margin: 2rem 0 2.5rem;
            border-radius: 20px;
            overflow: hidden;
            position: relative;
            background: #0f2a3f;
            color: #fff;
            display: grid;
            grid-template-columns: 1fr 1fr;
            align-items: center;
        }
        .hero-text {
            padding: 2.5rem 2.5rem;
        }
        .hero-text h1 {
            color: #fff;
            font-size: 2.6rem;
            margin-bottom: 0.8rem;
        }
        .hero-text p {
            font-size: 1.15rem;
            opacity: 0.9;
            margin-bottom: 1.5rem;
        }
        .hero-text .badge {
            display: inline-block;
            background: #e67e22;
            color: #fff;
            padding: 0.25rem 1rem;
            border-radius: 40px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.04em;
        }
        .hero-img {
            min-height: 240px;
            background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 600 400"><rect fill="%231a4a5e" width="600" height="400"/><text x="300" y="200" font-size="40" text-anchor="middle" fill="%23ffffff" font-family="sans-serif" font-weight="bold">Sudoku Nyt</text><text x="300" y="250" font-size="20" text-anchor="middle" fill="%23e67e22">🎯 Master the Grid</text></svg>') no-repeat center/cover;
            border-radius: 0 20px 20px 0;
        }
        .hero-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0 20px 20px 0;
        }
        .img-wrapper {
            margin: 2rem 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
        }
        .img-wrapper figcaption {
            padding: 0.8rem 1.2rem;
            background: #f1efe9;
            font-size: 0.9rem;
            color: #3a4a5a;
            font-style: italic;
        }
        .search-section {
            background: #fff;
            border-radius: 20px;
            padding: 2rem 2rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
            margin: 2.5rem 0;
        }
        .search-section form {
            display: flex;
            gap: 0.8rem;
            flex-wrap: wrap;
            align-items: center;
        }
        .search-section input[type="text"] {
            flex: 1;
            min-width: 200px;
            padding: 0.8rem 1.2rem;
            border: 2px solid #ddd;
            border-radius: 60px;
            font-size: 1rem;
            outline: none;
            transition: border 0.2s;
        }
        .search-section input[type="text"]:focus {
            border-color: #e67e22;
        }
        .search-section button {
            padding: 0.8rem 2rem;
            background: #e67e22;
            color: #fff;
            border: none;
            border-radius: 60px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-section button:hover {
            background: #cf6a17;
        }
        .user-feedback {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 2.5rem 0;
        }
        .feedback-card {
            background: #fff;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
        }
        .feedback-card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
            margin: 0.8rem 0 1rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #ccc;
            cursor: pointer;
            transition: color 0.15s;
        }
        .star-rating input:checked~label,
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: #f1c40f;
        }
        .feedback-card textarea {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 2px solid #ddd;
            border-radius: 12px;
            font-size: 0.95rem;
            font-family: inherit;
            resize: vertical;
            min-height: 100px;
            margin: 0.5rem 0 1rem;
            outline: none;
            transition: border 0.2s;
        }
        .feedback-card textarea:focus {
            border-color: #e67e22;
        }
        .feedback-card .btn {
            padding: 0.7rem 1.8rem;
            background: #1a4a5e;
            color: #fff;
            border: none;
            border-radius: 60px;
            font-size: 0.95rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }
        .feedback-card .btn:hover {
            background: #0d3e52;
        }
        .content {
            background: #fff;
            border-radius: 24px;
            padding: 2.5rem 2.8rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
            margin: 2rem 0;
        }
        .content .last-updated {
            display: block;
            text-align: right;
            font-size: 0.85rem;
            color: #7a8a9a;
            margin-bottom: 1.5rem;
            border-bottom: 1px solid #eee;
            padding-bottom: 0.8rem;
        }
        friend-link {
            display: block;
            background: #fff;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            margin: 2rem 0;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
        }
        friend-link h3 {
            margin-top: 0;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        friend-link ul {
            list-style: none;
            margin: 1rem 0 0;
            padding: 0;
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem 1.5rem;
        }
        friend-link li a {
            padding: 0.3rem 0.8rem;
            background: #f1efe9;
            border-radius: 40px;
            font-size: 0.92rem;
            transition: background 0.2s;
        }
        friend-link li a:hover {
            background: #e67e22;
            color: #fff;
            text-decoration: none;
        }
        footer {
            margin: 2.5rem -1rem 0;
            padding: 2rem 1.5rem 1.5rem;
            background: #0f2a3f;
            color: #cddce8;
            border-radius: 24px 24px 0 0;
        }
        .footer-inner {
            max-width: 1140px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        .footer-inner h4 {
            color: #fff;
            margin: 0 0 0.8rem;
            font-size: 1.1rem;
        }
        .footer-inner a {
            color: #b8d0dd;
        }
        .footer-inner a:hover {
            color: #e67e22;
        }
        .copyright {
            grid-column: 1 / -1;
            border-top: 1px solid #2a4a5e;
            padding-top: 1.2rem;
            margin-top: 1.5rem;
            font-size: 0.85rem;
            text-align: center;
            color: #8aaabc;
        }
        @media (max-width: 820px) {
            .hero {
                grid-template-columns: 1fr;
            }
            .hero-img {
                min-height: 200px;
                border-radius: 0 0 20px 20px;
            }
            .hero-text {
                padding: 2rem 1.5rem;
            }
            .hero-text h1 {
                font-size: 2rem;
            }
            .user-feedback {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 1.2rem;
            }
            .content {
                padding: 1.5rem 1.2rem;
            }
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 640px) {
            .hamburger {
                display: inline-block;
            }
            .nav-links {
                display: none;
                width: 100%;
            }
            #nav-toggle:checked~.nav-links {
                display: flex;
            }
            nav a {
                padding: 0.6rem 1rem;
                width: 100%;
                text-align: center;
            }
            .header-inner {
                gap: 0.5rem;
            }
            .my-logo {
                font-size: 1.6rem;
            }
            .search-section form {
                flex-direction: column;
            }
            .search-section input[type="text"] {
                min-width: auto;
                width: 100%;
            }
            .feedback-card {
                padding: 1.2rem 1rem;
            }
            .breadcrumb {
                font-size: 0.75rem;
                padding: 0.4rem 0;
            }
        }
        @media (min-width: 641px) {
            .nav-links {
                display: flex !important;
            }
            #nav-toggle {
                display: none;
            }
            .hamburger {
                display: none !important;
            }
        }
        .text-muted {
            color: #5a6a7a;
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .flex-center {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .highlight {
            background: #fef5e7;
            padding: 0.2rem 0.6rem;
            border-radius: 6px;
            font-weight: 500;
        }
        .emoji-lg {
            font-size: 1.4rem;
        }
        .sticky-side {
            position: sticky;
            top: 100px;
        }
        blockquote {
            border-left: 5px solid #e67e22;
            background: #faf8f4;
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: #2a3a4a;
        }
        blockquote cite {
            display: block;
            margin-top: 0.5rem;
            font-size: 0.9rem;
            color: #5a6a7a;
            font-style: normal;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 1.5rem 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
        }
        th,
        td {
            padding: 0.7rem 1rem;
            text-align: left;
            border-bottom: 1px solid #e8e4dc;
        }
        th {
            background: #f1efe9;
            font-weight: 600;
        }
        tr:hover td {
            background: #fdfaf5;
        }