*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', sans-serif;
            background: #0b0e14;
            color: #e8edf2;
            line-height: 1.75;
            padding: 0 16px;
            max-width: 1280px;
            margin: 0 auto;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: #f7c948;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #ffd966;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.01em;
            color: #f0f4fa;
        }
        h1 {
            font-size: 2.4rem;
            margin: 0 0 0.5rem 0;
        }
        h2 {
            font-size: 1.8rem;
            margin: 2.4rem 0 0.8rem 0;
            border-bottom: 2px solid #2a313c;
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.35rem;
            margin: 1.8rem 0 0.6rem 0;
            color: #f7c948;
        }
        h4 {
            font-size: 1.1rem;
            margin: 1.2rem 0 0.4rem 0;
            color: #cfd8e3;
        }
        p {
            margin: 0 0 1.2rem 0;
            color: #d0d7e2;
        }
        ul,
        ol {
            margin: 0 0 1.2rem 1.8rem;
            color: #d0d7e2;
        }
        li {
            margin-bottom: 0.4rem;
        }
        strong,
        b {
            color: #f7f9fc;
            font-weight: 700;
        }
        em {
            color: #f7c948;
        }
        hr {
            border: none;
            border-top: 1px solid #2a313c;
            margin: 2rem 0;
        }
        .wrapper {
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        main {
            flex: 1;
            padding: 1.2rem 0 2.5rem 0;
        }
        header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1rem 0 0.8rem 0;
            border-bottom: 1px solid #1f252e;
            position: relative;
            background: #0b0e14;
            z-index: 100;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #f7c948, #f59e0b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .my-logo i {
            background: none;
            -webkit-text-fill-color: #f7c948;
            font-size: 1.6rem;
        }
        .my-logo:hover {
            opacity: 0.9;
            text-decoration: none;
        }
        nav {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        nav a {
            padding: 0.4rem 0.9rem;
            border-radius: 40px;
            font-size: 0.88rem;
            font-weight: 500;
            color: #c5cdd9;
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
        }
        nav a:hover {
            background: #1f252e;
            color: #f7c948;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #e8edf2;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 0.2rem 0.5rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #1f252e;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 4px 10px;
            font-size: 0.8rem;
            color: #8895a7;
            padding: 0.5rem 0 0.2rem 0;
            margin-bottom: 0.6rem;
            list-style: none;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .breadcrumb li+li::before {
            content: "›";
            color: #555e6b;
            font-size: 1.1rem;
            margin-right: 4px;
        }
        .breadcrumb a {
            color: #f7c948;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .active {
            color: #aab3c1;
        }
        .search-wrap {
            display: flex;
            max-width: 520px;
            margin: 1.2rem 0 1.8rem 0;
            border-radius: 60px;
            overflow: hidden;
            border: 1px solid #2a313c;
            background: #131a22;
            transition: border-color 0.2s;
        }
        .search-wrap:focus-within {
            border-color: #f7c948;
        }
        .search-wrap input {
            flex: 1;
            padding: 0.7rem 1.2rem;
            border: none;
            background: transparent;
            color: #e8edf2;
            font-size: 0.95rem;
            outline: none;
            min-width: 0;
        }
        .search-wrap input::placeholder {
            color: #5f6a7a;
        }
        .search-wrap button {
            background: #f7c948;
            border: none;
            padding: 0 1.2rem;
            color: #0b0e14;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s;
            display: flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
        }
        .search-wrap button:hover {
            background: #ffd966;
        }
        .feature-img {
            margin: 1.6rem 0 2rem 0;
            border-radius: 16px;
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.6);
            width: 100%;
            max-height: 520px;
            object-fit: cover;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }
        @media (min-width: 820px) {
            .content-grid {
                grid-template-columns: 2fr 1fr;
            }
        }
        .sidebar-card {
            background: #111821;
            border-radius: 16px;
            padding: 1.5rem 1.2rem;
            border: 1px solid #1f252e;
            margin-bottom: 1.5rem;
        }
        .sidebar-card h3 {
            margin-top: 0;
            font-size: 1.2rem;
        }
        .sidebar-card ul {
            list-style: none;
            margin-left: 0;
        }
        .sidebar-card li {
            padding: 0.4rem 0;
            border-bottom: 1px solid #1a212a;
        }
        .sidebar-card li:last-child {
            border-bottom: none;
        }
        .sidebar-card a {
            font-weight: 500;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.8rem;
            margin: 2.5rem 0;
            padding: 1.8rem 0;
            border-top: 1px solid #1f252e;
            border-bottom: 1px solid #1f252e;
        }
        @media (min-width: 640px) {
            .feedback-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        .feedback-card {
            background: #111821;
            border-radius: 16px;
            padding: 1.5rem;
            border: 1px solid #1f252e;
        }
        .feedback-card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 0.4rem;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            background: #0b0e14;
            border: 1px solid #2a313c;
            border-radius: 8px;
            padding: 0.65rem 1rem;
            color: #e8edf2;
            font-size: 0.9rem;
            outline: none;
            transition: border-color 0.2s;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: #f7c948;
        }
        .feedback-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .feedback-card button {
            background: #f7c948;
            border: none;
            padding: 0.65rem 1.2rem;
            border-radius: 60px;
            font-weight: 700;
            font-size: 0.95rem;
            color: #0b0e14;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            align-self: flex-start;
        }
        .feedback-card button:hover {
            background: #ffd966;
            transform: scale(1.02);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 4px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.6rem;
            color: #3a4350;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f7c948;
        }
        friend-link {
            display: block;
            padding: 1.2rem 0 0.8rem 0;
            border-top: 1px solid #1f252e;
            margin-top: 1.2rem;
            font-size: 0.9rem;
        }
        friend-link a {
            display: inline-block;
            margin: 0.2rem 0.8rem 0.2rem 0;
            padding: 0.25rem 0.6rem;
            background: #131a22;
            border-radius: 30px;
            font-size: 0.85rem;
        }
        friend-link a:hover {
            background: #1f252e;
            text-decoration: none;
        }
        footer {
            padding: 1.5rem 0 2rem 0;
            text-align: center;
            font-size: 0.82rem;
            color: #6a7587;
            border-top: 1px solid #1a212a;
            margin-top: 1rem;
        }
        footer p {
            color: #6a7587;
            margin-bottom: 0.3rem;
        }
        footer a {
            color: #8895a7;
        }
        footer a:hover {
            color: #f7c948;
        }
        @media (max-width: 767px) {
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.35rem;
            }
            h3 {
                font-size: 1.1rem;
            }
            body {
                padding: 0 12px;
            }
            nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #0b0e14;
                padding: 0.8rem 0 1.2rem 0;
                gap: 4px;
                border-top: 1px solid #1f252e;
                margin-top: 0.6rem;
            }
            nav.open {
                display: flex;
            }
            nav a {
                padding: 0.5rem 1rem;
                width: 100%;
                border-radius: 8px;
            }
            .hamburger {
                display: block;
            }
            .breadcrumb {
                font-size: 0.72rem;
            }
            .search-wrap {
                max-width: 100%;
                flex-wrap: wrap;
            }
            .search-wrap button {
                padding: 0 1rem;
                font-size: 0.85rem;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .sidebar-card {
                padding: 1rem;
            }
        }
        @media (min-width: 768px) and (max-width: 1024px) {
            h1 {
                font-size: 2rem;
            }
            .content-grid {
                gap: 1.5rem;
            }
        }
        .badge {
            display: inline-block;
            background: #f7c94820;
            color: #f7c948;
            padding: 0.1rem 0.7rem;
            border-radius: 40px;
            font-size: 0.72rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            border: 1px solid #f7c94830;
        }
        .highlight-box {
            background: #111821;
            border-left: 4px solid #f7c948;
            padding: 1rem 1.4rem;
            border-radius: 0 12px 12px 0;
            margin: 1.2rem 0;
        }
        .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .toc {
            background: #111821;
            border-radius: 16px;
            padding: 1.2rem 1.5rem;
            border: 1px solid #1f252e;
            margin: 1.2rem 0 2rem 0;
        }
        .toc ol {
            margin-left: 1.2rem;
            margin-bottom: 0;
        }
        .toc li {
            margin-bottom: 0.25rem;
        }
        .toc a {
            color: #c5cdd9;
        }
        .toc a:hover {
            color: #f7c948;
        }
        .hidden-schema {
            display: none;
        }