*,
        *::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', sans-serif;
            background: #f8f9fc;
            color: #1e1e2a;
            line-height: 1.75;
            padding: 0 0 0 0;
        }
        a {
            color: #2a6df4;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #1a4fc4;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        h1,
        h2,
        h3,
        h4 {
            font-weight: 700;
            line-height: 1.25;
            margin-top: 1.8rem;
            margin-bottom: 0.75rem;
            color: #0e0e1a;
        }
        h1 {
            font-size: 2.4rem;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 1.8rem;
            border-left: 5px solid #2a6df4;
            padding-left: 1rem;
            margin-top: 2.4rem;
        }
        h3 {
            font-size: 1.35rem;
            color: #1e2a4a;
        }
        h4 {
            font-size: 1.1rem;
            color: #2a3a5a;
        }
        p {
            margin-bottom: 1.2rem;
        }
        ul,
        ol {
            margin: 0.8rem 0 1.4rem 2rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        strong {
            font-weight: 700;
            color: #0a0a1a;
        }
        em {
            font-style: italic;
        }
        hr {
            border: none;
            border-top: 2px solid #e0e4ed;
            margin: 2.5rem 0;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .site-header {
            background: linear-gradient(145deg, #0b0b20 0%, #1a1a3a 100%);
            color: #fff;
            padding: 0.8rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, #f9d976, #f39c12);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: 0 0 30px rgba(243, 156, 18, 0.15);
            transition: transform 0.2s;
            display: inline-block;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
        }
        .my-logo small {
            font-size: 0.7rem;
            -webkit-text-fill-color: #aaa;
            color: #aaa;
            font-weight: 400;
            letter-spacing: 0.3px;
            display: block;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 0.2rem;
            margin: 0;
            padding: 0;
        }
        .nav-list li a {
            color: #ddd;
            padding: 0.55rem 1rem;
            border-radius: 30px;
            font-size: 0.92rem;
            font-weight: 500;
            transition: background 0.2s, color 0.2s;
            display: inline-block;
        }
        .nav-list li a:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            text-decoration: none;
        }
        .nav-list li a.active {
            background: rgba(42, 109, 244, 0.35);
            color: #fff;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #fff;
            cursor: pointer;
            padding: 0.2rem 0.4rem;
            transition: opacity 0.2s;
        }
        .hamburger:hover {
            opacity: 0.8;
        }
        .breadcrumb {
            background: #f0f2f7;
            padding: 0.6rem 0;
            font-size: 0.88rem;
            border-bottom: 1px solid #dce0e8;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            margin: 0;
            padding: 0;
            gap: 0.3rem 0.6rem;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.5rem;
            color: #888;
        }
        .breadcrumb a {
            color: #2a6df4;
        }
        .breadcrumb .current {
            color: #555;
            font-weight: 500;
        }
        .search-section {
            background: #ffffff;
            border-radius: 20px;
            padding: 2rem 2rem;
            margin: 2.5rem 0;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.04);
            border: 1px solid #eaedf4;
        }
        .search-section form {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            align-items: center;
            max-width: 700px;
            margin: 0 auto;
        }
        .search-section input[type="text"] {
            flex: 1 1 260px;
            padding: 0.9rem 1.4rem;
            border: 2px solid #dce0e8;
            border-radius: 50px;
            font-size: 1rem;
            outline: none;
            transition: border 0.3s, box-shadow 0.3s;
        }
        .search-section input[type="text"]:focus {
            border-color: #2a6df4;
            box-shadow: 0 0 0 4px rgba(42, 109, 244, 0.12);
        }
        .search-section button {
            background: #2a6df4;
            color: #fff;
            border: none;
            padding: 0.85rem 2.2rem;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .search-section button:hover {
            background: #1a4fc4;
            transform: translateY(-2px);
        }
        .search-section button i {
            font-size: 1.1rem;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 2rem 0;
        }
        .content-area {
            background: #fff;
            border-radius: 24px;
            padding: 2.2rem 2.5rem;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
            border: 1px solid #edf0f6;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-card {
            background: #fff;
            border-radius: 20px;
            padding: 1.6rem 1.8rem;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
            border: 1px solid #edf0f6;
        }
        .sidebar-card h3 {
            margin-top: 0;
            font-size: 1.2rem;
            border-bottom: 2px solid #eef2f8;
            padding-bottom: 0.6rem;
            margin-bottom: 1rem;
        }
        .sidebar-card ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .sidebar-card li {
            margin-bottom: 0.5rem;
        }
        .sidebar-card li a {
            display: block;
            padding: 0.3rem 0;
            font-size: 0.95rem;
        }
        .sidebar-card li a::before {
            content: "›";
            margin-right: 0.6rem;
            color: #2a6df4;
            font-weight: 700;
        }
        .feature-img {
            border-radius: 20px;
            margin: 1.8rem 0 2.2rem;
            overflow: hidden;
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.08);
        }
        .feature-img img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }
        .feature-img figcaption {
            padding: 0.8rem 1.2rem;
            background: #f4f6fc;
            font-size: 0.9rem;
            color: #444;
            border-top: 1px solid #e4e8f0;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 2.8rem 0 1.5rem;
        }
        .feedback-card {
            background: #f8faff;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            border: 1px solid #e4eaf4;
        }
        .feedback-card h3 {
            margin-top: 0;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            margin-top: 0.8rem;
        }
        .feedback-card input,
        .feedback-card textarea {
            padding: 0.8rem 1.2rem;
            border: 2px solid #dce0e8;
            border-radius: 12px;
            font-size: 0.95rem;
            font-family: inherit;
            outline: none;
            transition: border 0.3s;
            background: #fff;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus {
            border-color: #2a6df4;
        }
        .feedback-card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .feedback-card button {
            background: #2a6df4;
            color: #fff;
            border: none;
            padding: 0.75rem 1.6rem;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
            align-self: flex-start;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feedback-card button:hover {
            background: #1a4fc4;
            transform: translateY(-2px);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.25rem;
            font-size: 1.8rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            color: #ccc;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5b342;
        }
        .site-footer {
            background: #0b0b20;
            color: #bbb;
            padding: 2.5rem 0 1.8rem;
            margin-top: 3.5rem;
            border-top: 4px solid #2a6df4;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2.5rem;
        }
        .footer-inner h4 {
            color: #eee;
            margin-top: 0;
            font-size: 1.1rem;
            border-bottom: 1px solid #2a2a4a;
            padding-bottom: 0.5rem;
        }
        .footer-inner a {
            color: #9ab0e6;
        }
        .footer-inner a:hover {
            color: #fff;
        }
        friend-link {
            display: block;
            margin: 0.6rem 0;
        }
        friend-link a {
            display: inline-block;
            margin-right: 1.2rem;
            padding: 0.2rem 0;
        }
        .copyright {
            grid-column: 1 / -1;
            text-align: center;
            padding-top: 1.8rem;
            border-top: 1px solid #2a2a4a;
            font-size: 0.9rem;
            color: #888;
            margin-top: 1rem;
        }
        .copyright strong {
            color: #ccc;
        }
        @media (max-width: 992px) {
            .main-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 1.5rem;
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-list {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #12122a;
                border-radius: 20px;
                padding: 1rem 0.5rem;
                margin-top: 0.8rem;
                gap: 0.2rem;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
                z-index: 99;
            }
            .nav-list.open {
                display: flex;
            }
            .nav-list li a {
                padding: 0.7rem 1.4rem;
                border-radius: 12px;
            }
            .hamburger {
                display: block;
            }
            .header-inner {
                position: relative;
            }
            .content-area {
                padding: 1.5rem 1.2rem;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
                padding-left: 0.7rem;
            }
            .sidebar {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .search-section {
                padding: 1.5rem 1.2rem;
            }
            .feedback-card {
                padding: 1.2rem 1.2rem;
            }
            .feedback-grid {
                gap: 1.2rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.9rem;
            }
            .search-section form {
                flex-direction: column;
            }
            .search-section input[type="text"] {
                width: 100%;
            }
            .search-section button {
                width: 100%;
                justify-content: center;
            }
            .star-rating {
                font-size: 1.5rem;
            }
        }
        .last-updated {
            font-size: 0.9rem;
            color: #777;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-bottom: 1.2rem;
            padding: 0.4rem 1rem;
            background: #f0f4ff;
            border-radius: 40px;
            width: fit-content;
        }
        .last-updated i {
            color: #2a6df4;
        }
        .table-of-contents {
            background: #f4f7fe;
            border-radius: 18px;
            padding: 1.6rem 2rem;
            margin: 1.8rem 0 2.2rem;
            border: 1px solid #e0e8f4;
        }
        .table-of-contents h3 {
            margin-top: 0;
        }
        .table-of-contents ol {
            margin: 0.6rem 0 0 1.2rem;
            columns: 2;
            column-gap: 2.5rem;
        }
        .table-of-contents li {
            margin-bottom: 0.3rem;
            break-inside: avoid;
        }
        @media (max-width: 600px) {
            .table-of-contents ol {
                columns: 1;
            }
        }
        .highlight-box {
            background: #eef5ff;
            border-left: 5px solid #2a6df4;
            padding: 1.4rem 1.8rem;
            border-radius: 12px;
            margin: 1.8rem 0;
        }
        .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .link-list-inline {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem 1.2rem;
            list-style: none;
            margin: 1rem 0;
            padding: 0;
        }
        .link-list-inline li a {
            background: #f0f4ff;
            padding: 0.3rem 1rem;
            border-radius: 30px;
            font-size: 0.9rem;
            border: 1px solid #dce4f0;
            transition: background 0.2s;
        }
        .link-list-inline li a:hover {
            background: #dce6ff;
            text-decoration: none;
        }
        .emoji-big {
            font-size: 1.4em;
            margin-right: 0.2em;
        }
        .fa-ul {
            margin-left: 2.2rem;
        }