*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
            background: #f5f7fa;
            color: #1e2b3c;
            line-height: 1.7;
            padding: 0 1rem;
            max-width: 1240px;
            margin: 0 auto;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        a {
            color: #1e6f9f;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover,
        a:focus-visible {
            color: #0b3b5a;
            text-decoration: underline;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin: 1rem 0;
        }
        li {
            margin-bottom: 0.4rem;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.2;
            color: #0b1f2e;
            margin: 2rem 0 1rem;
        }
        h2 {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            line-height: 1.25;
            color: #123245;
            margin: 2.8rem 0 1rem;
            border-bottom: 3px solid #d0e2f0;
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.5rem;
            font-weight: 600;
            line-height: 1.3;
            color: #1a4058;
            margin: 2rem 0 0.8rem;
        }
        h4 {
            font-size: 1.2rem;
            font-weight: 600;
            line-height: 1.35;
            color: #235a7a;
            margin: 1.6rem 0 0.6rem;
        }
        p {
            margin: 0 0 1.2rem 0;
            font-size: 1.05rem;
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1.2rem 0;
            border-bottom: 1px solid #dce5ed;
            margin-bottom: 1rem;
            position: relative;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #0b1f2e;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, #1e6f9f, #3b9bd6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-block;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .nav-toggle {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: #1e2b3c;
            cursor: pointer;
            padding: 0.3rem 0.6rem;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: #e2ecf5;
        }
        .nav-menu {
            display: flex;
            flex-wrap: wrap;
            gap: 0.2rem 1rem;
            align-items: center;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .nav-menu li a {
            padding: 0.4rem 0.8rem;
            border-radius: 6px;
            font-weight: 500;
            font-size: 0.95rem;
            color: #1e2b3c;
            transition: background 0.2s, color 0.2s;
        }
        .nav-menu li a:hover {
            background: #dce8f2;
            color: #0b3b5a;
            text-decoration: none;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem 0.6rem;
            font-size: 0.9rem;
            padding: 0.8rem 0;
            color: #5a6e7e;
            list-style: none;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.6rem;
            color: #8aa0b0;
        }
        .breadcrumb a {
            color: #1e6f9f;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .search-form {
            display: flex;
            gap: 0.5rem;
            max-width: 520px;
            margin: 1.8rem 0 1rem;
            flex-wrap: wrap;
        }
        .search-form input[type="text"] {
            flex: 1;
            min-width: 180px;
            padding: 0.7rem 1rem;
            border: 2px solid #ccdbe8;
            border-radius: 30px;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.25s;
            background: #fff;
        }
        .search-form input[type="text"]:focus {
            border-color: #1e6f9f;
        }
        .search-form button {
            padding: 0.7rem 1.6rem;
            background: #1e6f9f;
            color: #fff;
            border: none;
            border-radius: 30px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.1s;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .search-form button:hover {
            background: #0f4b6e;
            transform: scale(1.02);
        }
        .feature-card {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.6rem 1.8rem;
            box-shadow: 0 4px 14px rgba(0, 20, 40, 0.06);
            margin: 1.6rem 0;
            border: 1px solid #e6edf4;
            transition: box-shadow 0.25s, transform 0.2s;
        }
        .feature-card:hover {
            box-shadow: 0 8px 30px rgba(0, 20, 40, 0.10);
            transform: translateY(-2px);
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 1.6rem;
        }
        .comment-form,
        .score-form {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.8rem 2rem;
            box-shadow: 0 4px 14px rgba(0, 20, 40, 0.05);
            border: 1px solid #e6edf4;
            margin: 1.6rem 0;
        }
        .comment-form textarea {
            width: 100%;
            min-height: 120px;
            padding: 0.9rem 1.2rem;
            border: 2px solid #ccdbe8;
            border-radius: 12px;
            font-size: 1rem;
            font-family: inherit;
            resize: vertical;
            outline: none;
            transition: border-color 0.25s;
        }
        .comment-form textarea:focus {
            border-color: #1e6f9f;
        }
        .comment-form input[type="text"],
        .score-form input[type="number"],
        .score-form select {
            padding: 0.7rem 1rem;
            border: 2px solid #ccdbe8;
            border-radius: 10px;
            font-size: 1rem;
            outline: none;
            width: 100%;
            max-width: 360px;
            transition: border-color 0.25s;
        }
        .comment-form input[type="text"]:focus,
        .score-form input[type="number"]:focus,
        .score-form select:focus {
            border-color: #1e6f9f;
        }
        .form-row {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            align-items: center;
            margin: 0.8rem 0;
        }
        .btn-primary {
            padding: 0.7rem 2rem;
            background: #1e6f9f;
            color: #fff;
            border: none;
            border-radius: 30px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.1s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .btn-primary:hover {
            background: #0f4b6e;
            transform: scale(1.02);
        }
        .btn-outline {
            padding: 0.6rem 1.4rem;
            background: transparent;
            color: #1e6f9f;
            border: 2px solid #1e6f9f;
            border-radius: 30px;
            font-size: 0.95rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, color 0.25s;
        }
        .btn-outline:hover {
            background: #1e6f9f;
            color: #fff;
        }
        friend-link {
            display: block;
            padding: 1.4rem 0;
            margin-top: 2rem;
            border-top: 2px solid #dce5ed;
            font-size: 0.95rem;
        }
        friend-link a {
            margin: 0 0.6rem 0.4rem 0;
            display: inline-block;
        }
        .site-footer {
            padding: 2rem 0 1.5rem;
            border-top: 1px solid #dce5ed;
            margin-top: 2rem;
            text-align: center;
            font-size: 0.9rem;
            color: #4a6072;
        }
        .site-footer .copyright {
            margin-top: 0.8rem;
            font-size: 0.85rem;
            color: #6a8296;
        }
        @media (max-width: 820px) {
            .grid-2 {
                grid-template-columns: 1fr;
                gap: 1.2rem;
            }
            .grid-3 {
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            h3 {
                font-size: 1.3rem;
            }
            h4 {
                font-size: 1.1rem;
            }
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #ffffff;
                border-radius: 12px;
                padding: 1rem 0.5rem;
                margin-top: 0.8rem;
                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
                border: 1px solid #e6edf4;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu li a {
                padding: 0.6rem 1rem;
                display: block;
            }
            .search-form input[type="text"] {
                min-width: 140px;
            }
        }
        @media (max-width: 540px) {
            .grid-3 {
                grid-template-columns: 1fr;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .site-header {
                padding: 0.8rem 0;
            }
            .breadcrumb {
                font-size: 0.8rem;
            }
            .feature-card {
                padding: 1.2rem 1.2rem;
            }
            .comment-form,
            .score-form {
                padding: 1.2rem 1.2rem;
            }
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.35rem;
            }
            h3 {
                font-size: 1.15rem;
            }
        }
        .text-muted {
            color: #5a6e7e;
        }
        .mt-1 {
            margin-top: 1rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .flex-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem 1rem;
            align-items: center;
        }
        .img-caption {
            font-size: 0.9rem;
            color: #4a6072;
            text-align: center;
            margin-top: 0.4rem;
            font-style: italic;
        }
        .last-updated {
            display: inline-block;
            background: #e8f0f8;
            padding: 0.2rem 1rem;
            border-radius: 20px;
            font-size: 0.85rem;
            color: #1a4058;
            margin: 0.6rem 0 1.2rem;
        }
        .ratio-img {
            border-radius: 12px;
            width: 100%;
            height: auto;
            object-fit: cover;
            background: #dce5ed;
        }
        blockquote {
            border-left: 4px solid #1e6f9f;
            padding: 0.8rem 1.4rem;
            margin: 1.4rem 0;
            background: #f0f6fc;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: #1a3a4e;
        }
        .highlight-box {
            background: #eef5fa;
            border-radius: 12px;
            padding: 1.4rem 1.8rem;
            border: 1px solid #d0e2f0;
            margin: 1.4rem 0;
        }