*,
        *::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, 'Helvetica Neue', sans-serif;
            background: #f6f8fc;
            color: #1e2a3a;
            line-height: 1.7;
            padding: 0 1rem;
            max-width: 1280px;
            margin: 0 auto;
        }
        a {
            color: #1e6f9f;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #0b3b5e;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        header {
            padding: 1rem 0 0.5rem;
            border-bottom: 2px solid #e2e8f0;
            margin-bottom: 1.5rem;
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.5rem 1rem;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(145deg, #0b3b5e, #1e6f9f);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-block;
        }
        .my-logo small {
            font-size: 0.9rem;
            font-weight: 400;
            -webkit-text-fill-color: #4a6580;
            color: #4a6580;
            letter-spacing: 0.3px;
        }
        .my-logo a {
            text-decoration: none;
            background: none;
            -webkit-text-fill-color: inherit;
            color: inherit;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            background: none;
            border: none;
            color: #1e2a3a;
            padding: 0.2rem 0.6rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #e2e8f0;
        }
        .main-nav {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.25rem 1.2rem;
        }
        .main-nav a {
            font-weight: 500;
            padding: 0.4rem 0.2rem;
            border-bottom: 2px solid transparent;
            font-size: 0.95rem;
        }
        .main-nav a:hover {
            border-bottom-color: #1e6f9f;
            text-decoration: none;
        }
        .nav-search-form {
            display: flex;
            align-items: center;
            gap: 0.3rem;
            margin-left: 0.5rem;
        }
        .nav-search-form input[type="text"] {
            padding: 0.4rem 0.8rem;
            border: 1px solid #cbd5e1;
            border-radius: 30px;
            font-size: 0.85rem;
            min-width: 140px;
            background: #fff;
            transition: border 0.2s, box-shadow 0.2s;
        }
        .nav-search-form input[type="text"]:focus {
            outline: none;
            border-color: #1e6f9f;
            box-shadow: 0 0 0 3px rgba(30, 111, 159, 0.15);
        }
        .nav-search-form button {
            background: #1e6f9f;
            color: #fff;
            border: none;
            border-radius: 30px;
            padding: 0.4rem 1rem;
            font-size: 0.85rem;
            cursor: pointer;
            transition: background 0.2s;
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .nav-search-form button:hover {
            background: #0b3b5e;
        }
        .breadcrumb {
            margin-top: 0.6rem;
            font-size: 0.85rem;
            color: #4a6580;
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.6rem;
        }
        .breadcrumb a {
            color: #1e6f9f;
        }
        .breadcrumb span {
            color: #7a8da0;
        }
        .breadcrumb .current {
            color: #1e2a3a;
            font-weight: 500;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
            margin: 2rem 0;
        }
        .main-content {
            min-width: 0;
        }
        .sidebar {
            min-width: 0;
        }
        @media (max-width: 820px) {
            .content-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .sidebar {
                order: 2;
            }
            .main-content {
                order: 1;
            }
        }
        .sidebar-widget {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.2rem 1.4rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
            border: 1px solid #e8edf4;
        }
        .sidebar-widget h3 {
            font-size: 1.1rem;
            margin-bottom: 0.8rem;
            border-left: 4px solid #1e6f9f;
            padding-left: 0.7rem;
            color: #0b3b5e;
        }
        .sidebar-widget ul {
            list-style: none;
        }
        .sidebar-widget li {
            padding: 0.45rem 0;
            border-bottom: 1px solid #f0f3f8;
        }
        .sidebar-widget li:last-child {
            border-bottom: none;
        }
        .sidebar-widget li a {
            font-size: 0.92rem;
            display: block;
            transition: transform 0.15s;
        }
        .sidebar-widget li a:hover {
            transform: translateX(4px);
            text-decoration: none;
        }
        .score-widget {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.2rem 1.4rem;
            margin-bottom: 1.5rem;
            border: 1px solid #e8edf4;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
        }
        .score-widget h3 {
            font-size: 1.1rem;
            margin-bottom: 0.7rem;
            border-left: 4px solid #f5a623;
            padding-left: 0.7rem;
            color: #0b3b5e;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
            font-size: 1.6rem;
            margin: 0.6rem 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            color: #d1d9e6;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5a623;
        }
        .score-widget button {
            background: #f5a623;
            border: none;
            color: #fff;
            padding: 0.5rem 1.4rem;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            font-size: 0.9rem;
        }
        .score-widget button:hover {
            background: #d48e1c;
        }
        h1 {
            font-size: 2.2rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 1.2rem;
            color: #0b3b5e;
        }
        h2 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-top: 2.5rem;
            margin-bottom: 0.9rem;
            color: #0b3b5e;
            border-bottom: 2px solid #e2e8f0;
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-top: 1.8rem;
            margin-bottom: 0.6rem;
            color: #1e3a5a;
        }
        h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-top: 1.2rem;
            margin-bottom: 0.4rem;
            color: #2c4a6a;
        }
        p {
            margin-bottom: 1rem;
        }
        .lead {
            font-size: 1.15rem;
            font-weight: 400;
            color: #2c4a6a;
            background: #eef4fa;
            padding: 1rem 1.4rem;
            border-radius: 12px;
            border-left: 5px solid #1e6f9f;
        }
        .highlight-box {
            background: #f0f7fe;
            border-radius: 12px;
            padding: 1.2rem 1.5rem;
            margin: 1.2rem 0;
            border: 1px solid #d5e5f2;
        }
        .highlight-box strong {
            color: #0b3b5e;
        }
        .emoji-big {
            font-size: 1.4rem;
            margin-right: 0.3rem;
        }
        .badge {
            display: inline-block;
            background: #1e6f9f;
            color: #fff;
            padding: 0.15rem 0.7rem;
            border-radius: 30px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .feature-image {
            margin: 1.8rem 0;
            border-radius: 14px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
        }
        .feature-image figcaption {
            font-size: 0.85rem;
            color: #4a6580;
            margin-top: 0.5rem;
            text-align: center;
            font-style: italic;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 1.2rem 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.92rem;
            background: #fff;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
        }
        th {
            background: #0b3b5e;
            color: #fff;
            padding: 0.7rem 1rem;
            text-align: left;
            font-weight: 600;
        }
        td {
            padding: 0.6rem 1rem;
            border-bottom: 1px solid #eef2f7;
        }
        tr:last-child td {
            border-bottom: none;
        }
        tr:nth-child(even) td {
            background: #f8fafc;
        }
        .comment-section {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.6rem 1.8rem;
            margin: 2.5rem 0 1.5rem;
            border: 1px solid #e8edf4;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
        }
        .comment-section h2 {
            margin-top: 0;
            border-bottom: none;
        }
        .comment-form textarea,
        .comment-form input {
            width: 100%;
            padding: 0.7rem 1rem;
            border: 1px solid #cbd5e1;
            border-radius: 10px;
            font-family: inherit;
            font-size: 0.92rem;
            margin-bottom: 0.8rem;
            transition: border 0.2s, box-shadow 0.2s;
            background: #fafcfe;
        }
        .comment-form textarea:focus,
        .comment-form input:focus {
            outline: none;
            border-color: #1e6f9f;
            box-shadow: 0 0 0 3px rgba(30, 111, 159, 0.1);
        }
        .comment-form textarea {
            min-height: 90px;
            resize: vertical;
        }
        .comment-form .row-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.8rem;
        }
        .comment-form button {
            background: #1e6f9f;
            color: #fff;
            border: none;
            padding: 0.7rem 2rem;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            font-size: 0.95rem;
        }
        .comment-form button:hover {
            background: #0b3b5e;
        }
        .comment-list {
            margin-top: 1.5rem;
        }
        .comment-item {
            padding: 0.8rem 0;
            border-bottom: 1px solid #eef2f7;
        }
        .comment-item:last-child {
            border-bottom: none;
        }
        .comment-item strong {
            color: #0b3b5e;
        }
        .comment-item .date {
            font-size: 0.8rem;
            color: #7a8da0;
            margin-left: 0.5rem;
        }
        footer {
            margin-top: 3rem;
            padding: 2rem 0 1.5rem;
            border-top: 2px solid #e2e8f0;
        }
        friend-link {
            display: block;
            background: #f0f4fa;
            padding: 1.2rem 1.5rem;
            border-radius: 14px;
            margin-bottom: 1.2rem;
            font-size: 0.92rem;
            border: 1px solid #dde5ef;
        }
        friend-link a {
            display: inline-block;
            margin: 0.25rem 1.2rem 0.25rem 0;
            padding: 0.2rem 0;
        }
        .copyright {
            font-size: 0.85rem;
            color: #4a6580;
            text-align: center;
            padding-top: 1rem;
            border-top: 1px solid #e2e8f0;
            margin-top: 1rem;
        }
        .copyright strong {
            color: #1e2a3a;
        }
        @media (max-width: 640px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                padding: 0.8rem 0 0.4rem;
                gap: 0.3rem;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                padding: 0.5rem 0.2rem;
                border-bottom: 1px solid #e8edf4;
            }
            .nav-search-form {
                width: 100%;
                margin-left: 0;
                margin-top: 0.5rem;
                flex-wrap: wrap;
            }
            .nav-search-form input[type="text"] {
                flex: 1;
                min-width: 100px;
            }
            .header-top {
                flex-wrap: wrap;
            }
            h1 {
                font-size: 1.6rem;
            }
            h2 {
                font-size: 1.3rem;
            }
            .comment-form .row-2 {
                grid-template-columns: 1fr;
            }
            .sidebar-widget {
                padding: 1rem;
            }
        }
        @media (min-width: 641px) {
            .main-nav {
                display: flex !important;
            }
            .hamburger {
                display: none !important;
            }
        }
        .last-updated {
            font-size: 0.85rem;
            color: #4a6580;
            margin-bottom: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.4rem;
            flex-wrap: wrap;
        }
        .last-updated i {
            color: #1e6f9f;
        }
        .btn-small {
            background: #e2e8f0;
            border: none;
            padding: 0.3rem 0.9rem;
            border-radius: 30px;
            font-size: 0.8rem;
            cursor: pointer;
            transition: background 0.2s;
        }
        .btn-small:hover {
            background: #cbd5e1;
        }
        .toc {
            background: #ffffff;
            border-radius: 14px;
            padding: 1.2rem 1.6rem;
            border: 1px solid #e8edf4;
            margin: 1.5rem 0;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
        }
        .toc ol {
            padding-left: 1.4rem;
            columns: 2;
            column-gap: 2rem;
        }
        .toc li {
            margin: 0.25rem 0;
            break-inside: avoid;
        }
        .toc a {
            font-size: 0.92rem;
        }
        @media (max-width: 540px) {
            .toc ol {
                columns: 1;
            }
        }
        .tip-card {
            background: #fefcf0;
            border-left: 5px solid #f5a623;
            padding: 1rem 1.3rem;
            border-radius: 10px;
            margin: 1rem 0;
        }
        .tip-card strong {
            color: #b8860b;
        }
        .pro-tip {
            background: #eaf7ed;
            border-left: 5px solid #2e7d5e;
            padding: 1rem 1.3rem;
            border-radius: 10px;
            margin: 1rem 0;
        }
        .pro-tip strong {
            color: #1a5a3e;
        }