*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #f4f7fa;
            color: #1a2a3a;
            line-height: 1.7;
            padding: 0;
        }
        a {
            color: #0057a3;
            text-decoration: none;
            transition: color 0.2s, border-bottom 0.2s;
        }
        a:hover,
        a:focus {
            color: #003d73;
            border-bottom: 2px solid #0057a3;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: #0b1a2b;
            color: #fff;
            padding: 14px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 700;
            letter-spacing: 1px;
            background: linear-gradient(135deg, #f9d976, #f39c12);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: transform 0.2s;
            display: inline-block;
        }
        .my-logo:hover {
            transform: scale(1.02);
            border-bottom: none;
        }
        .my-logo i {
            -webkit-text-fill-color: initial;
            color: #f39c12;
            margin-right: 6px;
        }
        .nav-toggle {
            display: none;
            background: transparent;
            border: 2px solid #f39c12;
            color: #f39c12;
            font-size: 1.5rem;
            padding: 6px 14px;
            border-radius: 6px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(243, 156, 18, 0.15);
        }
        .primary-nav {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            align-items: center;
        }
        .primary-nav a {
            color: #e0e9f0;
            padding: 6px 14px;
            border-radius: 6px;
            font-size: 0.92rem;
            font-weight: 500;
            transition: background 0.2s, color 0.2s;
            border-bottom: none;
        }
        .primary-nav a:hover,
        .primary-nav a:focus {
            background: rgba(255, 255, 255, 0.12);
            color: #f9d976;
            border-bottom: none;
        }
        .primary-nav a.active {
            color: #f9d976;
            background: rgba(243, 156, 18, 0.18);
        }
        .breadcrumb-wrap {
            background: #e9edf2;
            padding: 10px 0;
            border-bottom: 1px solid #d0d7dd;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px;
            font-size: 0.88rem;
            color: #3a4a5a;
        }
        .breadcrumb a {
            color: #0057a3;
            border-bottom: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
            border-bottom: none;
        }
        .breadcrumb span.sep {
            color: #7a8a9a;
        }
        .main-content {
            padding: 30px 0 50px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
        }
        @media(min-width:992px) {
            .content-grid {
                grid-template-columns: 1fr 300px;
            }
        }
        .article-body h1 {
            font-size: 2.4rem;
            color: #0b1a2b;
            margin-bottom: 12px;
            line-height: 1.2;
            border-left: 6px solid #f39c12;
            padding-left: 20px;
        }
        .article-body h2 {
            font-size: 1.8rem;
            color: #0b1a2b;
            margin-top: 48px;
            margin-bottom: 18px;
            border-bottom: 3px solid #e0e7ed;
            padding-bottom: 8px;
        }
        .article-body h3 {
            font-size: 1.35rem;
            color: #1a3a4a;
            margin-top: 34px;
            margin-bottom: 12px;
        }
        .article-body h4 {
            font-size: 1.12rem;
            color: #2a4a5a;
            margin-top: 26px;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .article-body p {
            margin-bottom: 18px;
            font-size: 1.02rem;
            color: #1e2e3e;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 22px;
            padding-left: 28px;
        }
        .article-body li {
            margin-bottom: 8px;
        }
        .article-body strong {
            color: #0b1a2b;
        }
        .article-body .highlight-box {
            background: #e9f0f7;
            border-left: 6px solid #0057a3;
            padding: 18px 24px;
            border-radius: 0 8px 8px 0;
            margin: 24px 0;
        }
        .article-body .emoji-lg {
            font-size: 1.3rem;
            margin-right: 4px;
        }
        .feature-img-wrap {
            margin: 30px 0;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            background: #fff;
            padding: 12px;
        }
        .feature-img-wrap img {
            width: 100%;
            border-radius: 6px;
        }
        .feature-img-wrap figcaption {
            font-size: 0.88rem;
            color: #5a6a7a;
            padding: 10px 6px 4px;
            text-align: center;
            font-style: italic;
        }
        .sidebar {
            background: #ffffff;
            border-radius: 12px;
            padding: 24px 20px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar h3 {
            font-size: 1.2rem;
            color: #0b1a2b;
            margin-bottom: 16px;
            border-bottom: 2px solid #f0f2f5;
            padding-bottom: 8px;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar li {
            margin-bottom: 10px;
        }
        .sidebar a {
            display: flex;
            align-items: center;
            gap: 8px;
            color: #1a3a4a;
            font-size: 0.95rem;
            padding: 4px 0;
            border-bottom: none;
        }
        .sidebar a:hover {
            color: #0057a3;
            border-bottom: none;
        }
        .sidebar a i {
            width: 20px;
            color: #f39c12;
        }
        .interaction-section {
            margin-top: 50px;
            padding-top: 30px;
            border-top: 2px solid #dce3ea;
            display: grid;
            grid-template-columns: 1fr;
            gap: 36px;
        }
        @media(min-width:768px) {
            .interaction-section {
                grid-template-columns: 1fr 1fr;
            }
            .search-wrap {
                grid-column: 1/-1;
            }
        }
        .card-interact {
            background: #fff;
            border-radius: 12px;
            padding: 24px 22px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
        }
        .card-interact h3 {
            font-size: 1.2rem;
            color: #0b1a2b;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .card-interact h3 i {
            color: #f39c12;
        }
        .search-form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .search-form input[type="text"] {
            flex: 1;
            min-width: 180px;
            padding: 12px 18px;
            border: 2px solid #d0d7dd;
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.2s;
        }
        .search-form input[type="text"]:focus {
            border-color: #0057a3;
            outline: none;
        }
        .search-form button,
        .btn-submit {
            background: #0057a3;
            color: #fff;
            border: none;
            padding: 12px 26px;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .search-form button:hover,
        .btn-submit:hover {
            background: #003d73;
            transform: translateY(-1px);
        }
        .comment-form textarea {
            width: 100%;
            padding: 14px 16px;
            border: 2px solid #d0d7dd;
            border-radius: 8px;
            font-size: 1rem;
            font-family: inherit;
            resize: vertical;
            min-height: 100px;
            transition: border-color 0.2s;
        }
        .comment-form textarea:focus {
            border-color: #0057a3;
            outline: none;
        }
        .comment-form .form-row {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            margin-top: 12px;
            align-items: center;
        }
        .comment-form input[type="text"] {
            flex: 1;
            min-width: 140px;
            padding: 10px 14px;
            border: 2px solid #d0d7dd;
            border-radius: 8px;
            font-size: 0.95rem;
        }
        .comment-form input[type="text"]:focus {
            border-color: #0057a3;
            outline: none;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 4px;
            margin: 10px 0 14px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #d0d7dd;
            cursor: pointer;
            transition: color 0.15s;
        }
        .star-rating input:checked~label,
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: #f39c12;
        }
        .site-footer {
            background: #0b1a2b;
            color: #c8d4de;
            padding: 36px 0 24px;
            margin-top: 50px;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 1fr;
            gap: 28px;
        }
        @media(min-width:768px) {
            .footer-inner {
                grid-template-columns: 2fr 1fr 1fr;
            }
        }
        .footer-inner h4 {
            color: #f0e6d0;
            font-size: 1.05rem;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .footer-inner a {
            color: #a0b8cc;
            border-bottom: none;
        }
        .footer-inner a:hover {
            color: #f9d976;
            border-bottom: none;
        }
        .footer-links {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 6px;
        }
        .footer-links a {
            font-size: 0.92rem;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.04);
            padding: 16px 18px;
            border-radius: 10px;
            border: 1px solid rgba(255, 255, 255, 0.06);
            margin-top: 12px;
        }
        friend-link a {
            display: inline-block;
            margin: 4px 12px 4px 0;
            color: #b0c8dc;
            font-size: 0.95rem;
        }
        friend-link a::before {
            content: "🔗 ";
        }
        friend-link a:hover {
            color: #f9d976;
        }
        .copyright {
            text-align: center;
            padding-top: 24px;
            margin-top: 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.88rem;
            color: #889aa8;
        }
        .copyright strong {
            color: #d0dce6;
        }
        .last-updated {
            display: inline-block;
            background: #e9edf2;
            padding: 4px 16px;
            border-radius: 30px;
            font-size: 0.85rem;
            color: #3a5a6a;
            margin-bottom: 18px;
        }
        @media(max-width:767px) {
            .nav-toggle {
                display: block;
            }
            .primary-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                background: #0f2235;
                padding: 14px 10px;
                border-radius: 10px;
                margin-top: 8px;
            }
            .primary-nav.open {
                display: flex;
            }
            .primary-nav a {
                padding: 10px 14px;
                width: 100%;
            }
            .article-body h1 {
                font-size: 1.7rem;
                padding-left: 14px;
            }
            .article-body h2 {
                font-size: 1.4rem;
            }
            .article-body h3 {
                font-size: 1.15rem;
            }
            .sidebar {
                position: static;
            }
            .interaction-section {
                grid-template-columns: 1fr;
            }
            .search-form input[type="text"] {
                min-width: 120px;
            }
        }
        @media(min-width:768px) and (max-width:991px) {
            .content-grid {
                grid-template-columns: 1fr 240px;
                gap: 30px;
            }
        }
        .text-muted {
            color: #5a6a7a;
        }
        .mt-1 {
            margin-top: 12px;
        }
        .mb-1 {
            margin-bottom: 12px;
        }
        .gap-1 {
            gap: 8px;
        }
        .flex {
            display: flex;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .align-center {
            align-items: center;
        }