*,
        *::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: #f7f5f0;
            color: #1e1e1e;
            line-height: 1.7;
            padding: 0 1rem 2rem;
            max-width: 1280px;
            margin: 0 auto;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        a {
            color: #b8860b;
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover {
            color: #7a5c0a;
            text-decoration: underline;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin: 1rem 0;
        }
        li {
            margin-bottom: 0.4rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: #1e2b2f;
            margin-top: 2rem;
            margin-bottom: 0.75rem;
        }
        h1 {
            font-size: 2.4rem;
            border-left: 6px solid #b8860b;
            padding-left: 1rem;
            margin-top: 0.5rem;
        }
        h2 {
            font-size: 1.8rem;
            border-bottom: 2px solid #e0d5c0;
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.35rem;
            color: #2d4a3e;
        }
        h4 {
            font-size: 1.1rem;
            color: #3a5a4a;
        }
        p {
            margin-bottom: 1.25rem;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
        }
        header {
            background: linear-gradient(135deg, #1e2b2f 0%, #2d4a3e 100%);
            padding: 0.8rem 1.5rem;
            border-radius: 0 0 20px 20px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            position: relative;
            margin-bottom: 1.2rem;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: #f5e6c8;
            letter-spacing: 2px;
            text-shadow: 2px 2px 0 #7a5c0a;
            transition: transform 0.3s ease;
            display: inline-block;
            font-family: 'Georgia', serif;
        }
        .my-logo:hover {
            transform: scale(1.04);
            text-decoration: none;
            color: #ffdfa0;
        }
        .my-logo i {
            color: #b8860b;
            margin-right: 6px;
        }
        .nav-links {
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.8rem;
            list-style: none;
            padding: 0;
            margin: 0;
            align-items: center;
        }
        .nav-links li a {
            color: #f0ebe0;
            font-weight: 500;
            padding: 0.4rem 0.7rem;
            border-radius: 30px;
            font-size: 0.9rem;
            transition: background 0.25s, color 0.25s;
            white-space: nowrap;
        }
        .nav-links li a:hover {
            background: #b8860b;
            color: #1e2b2f;
            text-decoration: none;
        }
        .nav-links li a i {
            margin-right: 4px;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #f5e6c8;
            cursor: pointer;
            padding: 0.2rem 0.5rem;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        #nav-toggle {
            display: none;
        }
        #nav-toggle:checked~.nav-links {
            display: flex;
            flex-direction: column;
            width: 100%;
            margin-top: 1rem;
            background: #1e2b2f;
            padding: 1rem;
            border-radius: 16px;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0.6rem 0 0.4rem;
            margin: 0 0 1.2rem 0;
            font-size: 0.85rem;
            color: #5a5a5a;
            border-bottom: 1px solid #e0d5c0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin: 0 0.6rem;
            color: #b8860b;
        }
        .breadcrumb a {
            color: #6d7a4a;
        }
        .breadcrumb a:hover {
            color: #b8860b;
        }
        .breadcrumb .active {
            color: #1e2b2f;
            font-weight: 600;
        }
        .content-section {
            background: #ffffff;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            margin-bottom: 2rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
        }
        .content-section p {
            color: #2d2d2d;
        }
        .highlight-box {
            background: #f0ebe0;
            border-left: 5px solid #b8860b;
            padding: 1.2rem 1.6rem;
            border-radius: 12px;
            margin: 1.6rem 0;
        }
        .highlight-box strong {
            color: #2d4a3e;
        }
        .emoji-big {
            font-size: 1.4rem;
            margin-right: 4px;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 1.4rem;
            margin: 2rem 0;
        }
        .feature-card {
            background: #fbf9f5;
            border-radius: 16px;
            padding: 1.4rem 1.2rem;
            border: 1px solid #e8e0d0;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
        }
        .feature-card i {
            font-size: 2.2rem;
            color: #b8860b;
            margin-bottom: 0.6rem;
        }
        .feature-card h4 {
            margin-top: 0.2rem;
            margin-bottom: 0.4rem;
        }
        .chess-img-wrapper {
            margin: 2rem 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.1);
            background: #e8e0d0;
            text-align: center;
        }
        .chess-img-wrapper img {
            width: 100%;
            max-height: 480px;
            object-fit: cover;
        }
        .chess-img-wrapper figcaption {
            padding: 0.6rem 1rem;
            font-size: 0.9rem;
            color: #3a3a3a;
            background: #f5f0e4;
            font-style: italic;
        }
        .form-card {
            background: #fbf9f5;
            border-radius: 16px;
            padding: 1.6rem 2rem;
            border: 1px solid #e0d5c0;
            margin: 2rem 0;
        }
        .form-card label {
            font-weight: 600;
            display: block;
            margin-top: 1rem;
            margin-bottom: 0.3rem;
            color: #1e2b2f;
        }
        .form-card input,
        .form-card textarea,
        .form-card select {
            width: 100%;
            padding: 0.7rem 1rem;
            border: 1px solid #d0c8b8;
            border-radius: 10px;
            font-size: 1rem;
            background: #fff;
            transition: border-color 0.3s;
            font-family: inherit;
        }
        .form-card input:focus,
        .form-card textarea:focus {
            border-color: #b8860b;
            outline: none;
            box-shadow: 0 0 0 3px rgba(184, 134, 11, 0.15);
        }
        .form-card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .form-card .btn-submit {
            background: #b8860b;
            color: #fff;
            border: none;
            padding: 0.8rem 2.2rem;
            border-radius: 40px;
            font-size: 1.1rem;
            font-weight: 700;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
            margin-top: 1.2rem;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .form-card .btn-submit:hover {
            background: #7a5c0a;
            transform: scale(1.02);
        }
        .form-card .btn-submit i {
            font-size: 1.1rem;
        }
        .rating-stars {
            display: flex;
            gap: 0.3rem;
            font-size: 1.8rem;
            color: #d4c8a0;
            cursor: pointer;
            margin: 0.4rem 0 0.8rem;
        }
        .rating-stars .star {
            transition: color 0.2s, transform 0.2s;
        }
        .rating-stars .star:hover,
        .rating-stars .star.active {
            color: #b8860b;
            transform: scale(1.1);
        }
        friend-link {
            display: block;
            background: #1e2b2f;
            color: #f0ebe0;
            padding: 1.6rem 2rem;
            border-radius: 20px;
            margin-top: 2rem;
            font-style: normal;
        }
        friend-link a {
            color: #f5e6c8;
            font-weight: 500;
            margin: 0 0.6rem;
        }
        friend-link a:hover {
            color: #ffdfa0;
            text-decoration: underline;
        }
        friend-link .friend-label {
            font-weight: 700;
            font-size: 1.1rem;
            margin-right: 0.8rem;
            color: #b8860b;
        }
        footer {
            text-align: center;
            padding: 1.8rem 1rem 1rem;
            color: #5a5a5a;
            font-size: 0.9rem;
            border-top: 1px solid #e0d5c0;
            margin-top: 2.5rem;
        }
        footer .copyright {
            font-weight: 500;
            color: #1e2b2f;
        }
        footer .copyright i {
            color: #b8860b;
        }
        .last-updated {
            display: inline-block;
            background: #e8e0d0;
            padding: 0.2rem 1rem;
            border-radius: 30px;
            font-size: 0.8rem;
            color: #3a3a3a;
            margin-bottom: 1rem;
        }
        .last-updated i {
            margin-right: 4px;
            color: #b8860b;
        }
        @media (max-width: 820px) {
            header {
                padding: 0.6rem 1rem;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .hamburger {
                display: block;
            }
            .nav-links {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 0.3rem;
                margin-top: 0.6rem;
            }
            #nav-toggle:checked~.nav-links {
                display: flex;
            }
            .content-section {
                padding: 1.2rem 1rem;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .feature-grid {
                grid-template-columns: 1fr 1fr;
            }
            .form-card {
                padding: 1.2rem 1rem;
            }
        }
        @media (max-width: 480px) {
            body {
                padding: 0 0.5rem 1.2rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            h1 {
                font-size: 1.5rem;
                padding-left: 0.6rem;
            }
            .my-logo {
                font-size: 1.2rem;
            }
            .breadcrumb {
                font-size: 0.75rem;
            }
            .form-card .btn-submit {
                width: 100%;
                justify-content: center;
            }
            .rating-stars {
                font-size: 1.4rem;
            }
            friend-link {
                padding: 1.2rem 1rem;
                font-size: 0.9rem;
            }
        }
        .text-center {
            text-align: center;
        }
        .mt-1 {
            margin-top: 1rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .flex-between {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
        }
        .gap-1 {
            gap: 1rem;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }
        .chess-quote {
            font-style: italic;
            color: #4a5a4a;
            padding: 0.8rem 1.4rem;
            border-left: 4px solid #b8860b;
            background: #f5f0e4;
            border-radius: 0 12px 12px 0;
            margin: 1.4rem 0;
        }