*,
        *::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, sans-serif;
            background: #f4f7fc;
            color: #1a2a3a;
            line-height: 1.8;
            padding: 0;
        }
        a {
            color: #1e6bb8;
            text-decoration: none;
            transition: color 0.25s;
        }
        a:hover,
        a:focus {
            color: #c0392b;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #0b1a2e 0%, #1c3b5c 100%);
            color: #fff;
            padding: 16px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            color: #f7d94e;
            letter-spacing: -0.5px;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
            transition: transform 0.2s;
        }
        .my-logo:hover {
            transform: scale(1.03);
            text-decoration: none;
            color: #ffec8a;
        }
        .my-logo i {
            margin-right: 8px;
            color: #ff6b35;
        }
        .nav-toggle {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: #fff;
            cursor: pointer;
            padding: 4px 12px;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.12);
        }
        nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        nav a {
            color: #e0ecff;
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 30px;
            transition: background 0.25s, color 0.25s;
            font-size: 0.95rem;
        }
        nav a:hover,
        nav a.active {
            background: rgba(255, 255, 255, 0.15);
            color: #f7d94e;
            text-decoration: none;
        }
        nav a i {
            margin-right: 6px;
        }
        .breadcrumb {
            background: #eaf0f8;
            padding: 12px 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #d4dfec;
        }
        .breadcrumb .container {
            display: flex;
            flex-wrap: wrap;
            gap: 6px 10px;
        }
        .breadcrumb span {
            color: #3a5a7a;
        }
        .breadcrumb a {
            color: #1a5a8a;
        }
        .breadcrumb a:hover {
            color: #c0392b;
        }
        .breadcrumb .sep {
            color: #8a9bb0;
        }
        main {
            padding: 30px 0 50px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-body {
            background: #fff;
            border-radius: 20px;
            padding: 40px 45px;
            box-shadow: 0 8px 40px rgba(0, 0, 0, 0.05);
        }
        .sidebar {
            background: #fff;
            border-radius: 20px;
            padding: 30px 25px;
            box-shadow: 0 8px 40px rgba(0, 0, 0, 0.05);
            align-self: start;
            position: sticky;
            top: 100px;
        }
        .sidebar h3 {
            font-size: 1.2rem;
            border-left: 4px solid #f7d94e;
            padding-left: 14px;
            margin-bottom: 18px;
            color: #0b1a2e;
        }
        .sidebar ul {
            list-style: none;
        }
        .sidebar ul li {
            margin-bottom: 12px;
            border-bottom: 1px solid #edf2f8;
            padding-bottom: 10px;
        }
        .sidebar ul li a {
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar ul li a i {
            color: #ff6b35;
            font-size: 0.8rem;
        }
        h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: #0b1a2e;
            line-height: 1.25;
            margin-bottom: 10px;
        }
        h1 i {
            color: #f7d94e;
        }
        .article-body h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: #0b1a2e;
            margin: 40px 0 18px;
            padding-bottom: 8px;
            border-bottom: 3px solid #f7d94e;
        }
        .article-body h3 {
            font-size: 1.4rem;
            font-weight: 600;
            color: #1c3b5c;
            margin: 32px 0 14px;
        }
        .article-body h4 {
            font-size: 1.15rem;
            font-weight: 600;
            color: #2a4a6a;
            margin: 24px 0 10px;
        }
        .article-body p {
            margin-bottom: 18px;
            font-size: 1.05rem;
            color: #1e2e3e;
        }
        .article-body ul,
        .article-body ol {
            margin: 16px 0 24px 28px;
        }
        .article-body li {
            margin-bottom: 10px;
            font-size: 1.02rem;
        }
        .article-body .highlight-box {
            background: #f0f7ff;
            border-left: 5px solid #f7d94e;
            padding: 18px 24px;
            border-radius: 12px;
            margin: 24px 0;
        }
        .article-body .highlight-box strong {
            color: #c0392b;
        }
        .article-body .emoji-big {
            font-size: 1.4rem;
            margin-right: 6px;
        }
        .article-body .tip {
            background: #e3f2e9;
            border-left: 5px solid #2ecc71;
            padding: 14px 20px;
            border-radius: 10px;
            margin: 20px 0;
        }
        .article-body .tip strong {
            color: #1a7a4a;
        }
        .article-body .warning {
            background: #fef6e7;
            border-left: 5px solid #f39c12;
            padding: 14px 20px;
            border-radius: 10px;
            margin: 20px 0;
        }
        .last-updated {
            display: inline-block;
            background: #eaf0f8;
            padding: 4px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            color: #3a5a7a;
            margin-bottom: 20px;
        }
        .last-updated i {
            margin-right: 6px;
        }
        .featured-image {
            margin: 30px 0 30px;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 6px 30px rgba(0, 0, 0, 0.08);
        }
        .featured-image img {
            width: 100%;
            height: auto;
            max-height: 500px;
            object-fit: cover;
        }
        .featured-image figcaption {
            background: #f4f7fc;
            padding: 10px 18px;
            font-size: 0.9rem;
            color: #3a5a7a;
            text-align: center;
            font-style: italic;
        }
        .search-section {
            background: #eaf0f8;
            border-radius: 16px;
            padding: 24px 30px;
            margin: 30px 0;
        }
        .search-section form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .search-section input[type="text"] {
            flex: 1;
            min-width: 200px;
            padding: 14px 20px;
            border: 2px solid #c8d8e8;
            border-radius: 50px;
            font-size: 1rem;
            outline: none;
            transition: border 0.3s;
        }
        .search-section input[type="text"]:focus {
            border-color: #f7d94e;
        }
        .search-section button {
            background: #0b1a2e;
            color: #fff;
            border: none;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-section button:hover {
            background: #1c3b5c;
            transform: translateY(-2px);
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin: 40px 0 20px;
        }
        .feedback-card {
            background: #f8faff;
            border-radius: 16px;
            padding: 24px 28px;
            border: 1px solid #e4ecf6;
        }
        .feedback-card h3 {
            font-size: 1.2rem;
            margin-bottom: 16px;
            color: #0b1a2e;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .feedback-card textarea {
            padding: 14px 16px;
            border: 2px solid #d4dfec;
            border-radius: 12px;
            font-size: 1rem;
            resize: vertical;
            min-height: 100px;
            font-family: inherit;
            outline: none;
            transition: border 0.3s;
        }
        .feedback-card textarea:focus {
            border-color: #f7d94e;
        }
        .feedback-card input[type="text"],
        .feedback-card input[type="number"] {
            padding: 12px 16px;
            border: 2px solid #d4dfec;
            border-radius: 12px;
            font-size: 1rem;
            outline: none;
            transition: border 0.3s;
        }
        .feedback-card input:focus {
            border-color: #f7d94e;
        }
        .feedback-card .star-select {
            display: flex;
            gap: 6px;
            font-size: 1.6rem;
            color: #d4dfec;
            cursor: pointer;
        }
        .feedback-card .star-select i:hover,
        .feedback-card .star-select i.active {
            color: #f7d94e;
        }
        .feedback-card button {
            background: #0b1a2e;
            color: #fff;
            border: none;
            padding: 12px 24px;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
            align-self: flex-start;
        }
        .feedback-card button:hover {
            background: #1c3b5c;
            transform: translateY(-2px);
        }
        .feedback-card .rating-display {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.1rem;
            margin-top: 6px;
        }
        .feedback-card .rating-display .stars {
            color: #f7d94e;
        }
        footer {
            background: #0b1a2e;
            color: #c8d8e8;
            padding: 40px 0 20px;
            margin-top: 40px;
        }
        footer .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
        }
        footer h4 {
            color: #f7d94e;
            font-size: 1.1rem;
            margin-bottom: 14px;
        }
        footer a {
            color: #9bb8da;
        }
        footer a:hover {
            color: #f7d94e;
        }
        footer ul {
            list-style: none;
        }
        footer ul li {
            margin-bottom: 8px;
        }
        footer .copyright {
            grid-column: 1 / -1;
            border-top: 1px solid #1c3b5c;
            padding-top: 20px;
            margin-top: 20px;
            text-align: center;
            font-size: 0.9rem;
            color: #7a9abb;
        }
        friend-link {
            display: block;
            margin-top: 10px;
            font-size: 0.95rem;
        }
        friend-link a {
            display: inline-block;
            margin-right: 16px;
            margin-bottom: 6px;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                order: 2;
            }
            .article-body {
                order: 1;
                padding: 30px 24px;
            }
            footer .container {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .header-inner {
                flex-wrap: wrap;
            }
            .nav-toggle {
                display: block;
            }
            nav {
                display: none;
                width: 100%;
                flex-direction: column;
                background: #0b1a2e;
                padding: 16px 0 20px;
                margin-top: 12px;
                border-top: 1px solid #1c3b5c;
                gap: 4px;
            }
            nav.show {
                display: flex;
            }
            nav a {
                padding: 10px 20px;
                border-radius: 0;
                width: 100%;
            }
            nav a:hover {
                background: rgba(255, 255, 255, 0.06);
            }
            h1 {
                font-size: 1.8rem;
            }
            .article-body h2 {
                font-size: 1.4rem;
            }
            .article-body h3 {
                font-size: 1.2rem;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
            footer .container {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .article-body {
                padding: 20px 16px;
            }
            .search-section form {
                flex-direction: column;
            }
            .search-section button {
                width: 100%;
                justify-content: center;
            }
            .breadcrumb .container {
                font-size: 0.8rem;
            }
        }
        @media (max-width: 480px) {
            .my-logo {
                font-size: 1.2rem;
            }
            h1 {
                font-size: 1.5rem;
            }
            .article-body p {
                font-size: 0.98rem;
            }
            .container {
                padding: 0 12px;
            }
            .feedback-card {
                padding: 18px 16px;
            }
        }
        .anchor-offset {
            scroll-margin-top: 90px;
        }
        @media (min-width: 993px) {
            .sidebar {
                position: sticky;
                top: 100px;
            }
        }