*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #0b0e14;
            color: #e8edf2;
            line-height: 1.75;
            padding: 0;
            margin: 0;
            min-height: 100vh;
        }
        a {
            color: #f0a63a;
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover,
        a:focus {
            color: #ffcd7a;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin: 1rem 0;
        }
        li {
            margin-bottom: 0.4rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: #fff;
            margin-top: 1.8rem;
            margin-bottom: 0.8rem;
            letter-spacing: 0.01em;
        }
        h1 {
            font-size: 2.6rem;
            border-bottom: 3px solid #f0a63a;
            padding-bottom: 0.5rem;
            margin-top: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            border-left: 5px solid #f0a63a;
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.5rem;
            color: #f0d49e;
        }
        h4 {
            font-size: 1.2rem;
            color: #cbd5e1;
        }
        p {
            margin: 1rem 0;
        }
        blockquote {
            border-left: 4px solid #f0a63a;
            background: rgba(240, 166, 58, 0.08);
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
            font-style: italic;
        }
        hr {
            border: none;
            border-top: 1px solid #2a3240;
            margin: 2.5rem 0;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        header {
            background: #11171f;
            border-bottom: 2px solid #2a3240;
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            backdrop-filter: blur(6px);
            background: rgba(11, 14, 20, 0.96);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.75rem 1.5rem;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: #f0a63a;
            text-shadow: 0 0 12px rgba(240, 166, 58, 0.25);
            transition: text-shadow 0.3s;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .my-logo i {
            font-size: 2rem;
            color: #fff;
        }
        .my-logo:hover {
            text-shadow: 0 0 24px rgba(240, 166, 58, 0.5);
        }
        .my-logo small {
            font-size: 0.75rem;
            font-weight: 400;
            color: #94a3b8;
            letter-spacing: 0.04em;
            display: block;
            line-height: 1.2;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 1px solid #2a3240;
            color: #f0a63a;
            font-size: 1.6rem;
            padding: 0.4rem 0.8rem;
            border-radius: 6px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: #1e2632;
        }
        nav {
            display: flex;
            align-items: center;
            gap: 1.2rem;
            flex-wrap: wrap;
        }
        nav a {
            color: #cbd5e1;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.3rem 0.6rem;
            border-radius: 4px;
            transition: background 0.2s, color 0.2s;
        }
        nav a:hover {
            background: #1e2632;
            color: #f0a63a;
            text-decoration: none;
        }
        nav a i {
            margin-right: 0.35rem;
            font-size: 0.85rem;
        }
        .breadcrumb {
            padding: 0.6rem 0 0.2rem 0;
            font-size: 0.85rem;
            color: #94a3b8;
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.6rem;
            list-style: none;
            margin: 0;
        }
        .breadcrumb li {
            display: inline;
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            color: #f0a63a;
            margin-right: 0.5rem;
            font-weight: 700;
        }
        .breadcrumb a {
            color: #94a3b8;
        }
        .breadcrumb a:hover {
            color: #f0a63a;
        }
        .breadcrumb .active {
            color: #f0d49e;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 2rem 0 3rem 0;
        }
        @media(max-width:900px) {
            .main-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }
        .sidebar {
            background: #141b26;
            border-radius: 12px;
            padding: 1.5rem 1.2rem;
            border: 1px solid #2a3240;
            height: fit-content;
            position: sticky;
            top: 6rem;
        }
        .sidebar h3 {
            font-size: 1.3rem;
            border-bottom: 2px solid #f0a63a;
            padding-bottom: 0.5rem;
            margin-top: 0;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
            margin: 1rem 0;
        }
        .sidebar ul li {
            padding: 0.4rem 0;
            border-bottom: 1px solid #1e2632;
        }
        .sidebar ul li a {
            color: #cbd5e1;
            font-weight: 400;
        }
        .sidebar ul li a:hover {
            color: #f0a63a;
        }
        .sidebar .link-list i {
            width: 1.4rem;
            color: #f0a63a;
        }
        .search-box {
            background: #0b0e14;
            border-radius: 30px;
            border: 1px solid #2a3240;
            padding: 0.3rem 0.3rem 0.3rem 1.2rem;
            display: flex;
            align-items: center;
            transition: border-color 0.3s;
            max-width: 400px;
            margin: 1.2rem 0;
        }
        .search-box:focus-within {
            border-color: #f0a63a;
        }
        .search-box input {
            flex: 1;
            background: transparent;
            border: none;
            color: #e8edf2;
            padding: 0.5rem 0;
            font-size: 0.95rem;
            outline: none;
            min-width: 0;
        }
        .search-box input::placeholder {
            color: #64748b;
        }
        .search-box button {
            background: #f0a63a;
            border: none;
            color: #0b0e14;
            padding: 0.5rem 1.2rem;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .search-box button:hover {
            background: #ffcd7a;
            transform: scale(1.02);
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
            margin: 2.5rem 0;
        }
        @media(max-width:600px) {
            .feedback-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        .card {
            background: #141b26;
            border-radius: 12px;
            padding: 1.5rem 1.8rem;
            border: 1px solid #2a3240;
        }
        .card h3 {
            margin-top: 0;
            font-size: 1.3rem;
            border-bottom: 2px solid #f0a63a;
            padding-bottom: 0.4rem;
        }
        .card label {
            display: block;
            margin: 0.8rem 0 0.3rem 0;
            font-weight: 500;
            color: #cbd5e1;
        }
        .card input,
        .card textarea,
        .card select {
            width: 100%;
            padding: 0.6rem 0.8rem;
            border-radius: 6px;
            border: 1px solid #2a3240;
            background: #0b0e14;
            color: #e8edf2;
            font-size: 0.95rem;
            transition: border-color 0.3s;
            font-family: inherit;
        }
        .card input:focus,
        .card textarea:focus,
        .card select:focus {
            border-color: #f0a63a;
            outline: none;
        }
        .card textarea {
            min-height: 90px;
            resize: vertical;
        }
        .card .btn {
            background: #f0a63a;
            border: none;
            color: #0b0e14;
            padding: 0.6rem 1.6rem;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
            font-size: 0.95rem;
            margin-top: 0.8rem;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .card .btn:hover {
            background: #ffcd7a;
            transform: scale(1.02);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            gap: 0.25rem;
            justify-content: flex-end;
            margin: 0.4rem 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #2a3240;
            cursor: pointer;
            transition: color 0.2s;
            margin: 0;
            line-height: 1;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f0a63a;
        }
        footer {
            background: #0d121c;
            border-top: 2px solid #2a3240;
            padding: 2.5rem 0 1.5rem 0;
            margin-top: 3rem;
        }
        footer .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        @media(max-width:700px) {
            footer .container {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        footer h4 {
            color: #f0a63a;
            margin-top: 0;
            font-size: 1.1rem;
        }
        footer a {
            color: #94a3b8;
        }
        footer a:hover {
            color: #f0a63a;
        }
        footer .copyright {
            grid-column: 1 / -1;
            text-align: center;
            color: #64748b;
            font-size: 0.85rem;
            border-top: 1px solid #1e2632;
            padding-top: 1.5rem;
            margin-top: 1rem;
        }
        friend-link {
            display: block;
            margin: 0.8rem 0;
        }
        friend-link a {
            display: inline-block;
            margin: 0.2rem 0.6rem 0.2rem 0;
            padding: 0.2rem 0.6rem;
            background: #1e2632;
            border-radius: 4px;
            font-size: 0.9rem;
        }
        friend-link a:hover {
            background: #2a3240;
            color: #f0a63a;
            text-decoration: none;
        }
        @media(max-width:680px) {
            .nav-toggle {
                display: block;
            }
            nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                gap: 0.4rem;
                padding: 0.8rem 0 0.4rem 0;
            }
            nav.show {
                display: flex;
            }
            nav a {
                width: 100%;
                padding: 0.5rem 0.8rem;
                border-radius: 4px;
            }
            nav a i {
                width: 1.6rem;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.25rem;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .my-logo i {
                font-size: 1.5rem;
            }
            .header-inner {
                gap: 0.4rem;
            }
            .sidebar {
                position: static;
            }
        }
        .tag {
            display: inline-block;
            background: #1e2632;
            padding: 0.15rem 0.7rem;
            border-radius: 20px;
            font-size: 0.75rem;
            color: #94a3b8;
            margin-right: 0.3rem;
        }
        .stat-highlight {
            background: #1a2433;
            border-left: 4px solid #f0a63a;
            padding: 1rem 1.5rem;
            border-radius: 0 8px 8px 0;
            margin: 1.2rem 0;
        }
        .operator-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
            gap: 0.8rem;
            margin: 1rem 0;
        }
        .operator-grid .op-item {
            background: #141b26;
            padding: 0.6rem 1rem;
            border-radius: 6px;
            border: 1px solid #2a3240;
            text-align: center;
            font-weight: 500;
            transition: background 0.2s, border-color 0.2s;
        }
        .operator-grid .op-item:hover {
            background: #1e2a3a;
            border-color: #f0a63a;
        }
        .operator-grid .op-item i {
            margin-right: 0.4rem;
            color: #f0a63a;
        }
        .last-updated {
            color: #64748b;
            font-size: 0.85rem;
            margin: 0.5rem 0 1.2rem 0;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .last-updated i {
            color: #f0a63a;
        }
        .featured-image {
            margin: 1.8rem 0;
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid #2a3240;
        }
        .featured-image figcaption {
            background: #11171f;
            padding: 0.6rem 1rem;
            font-size: 0.85rem;
            color: #94a3b8;
            text-align: center;
        }
        .toc {
            background: #141b26;
            border-radius: 8px;
            padding: 1.2rem 1.5rem;
            margin: 1.8rem 0;
            border: 1px solid #2a3240;
        }
        .toc ol {
            margin: 0.4rem 0 0 0;
        }
        .toc ol li {
            margin-bottom: 0.25rem;
        }
        .toc a {
            color: #cbd5e1;
        }
        .toc a:hover {
            color: #f0a63a;
        }
        ::selection {
            background: #f0a63a;
            color: #0b0e14;
        }
        .scroll-top {
            position: fixed;
            bottom: 1.8rem;
            right: 1.8rem;
            background: #f0a63a;
            color: #0b0e14;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            border: none;
            cursor: pointer;
            opacity: 0.85;
            transition: opacity 0.3s, transform 0.25s;
            z-index: 999;
            box-shadow: 0 4px 16px rgba(240, 166, 58, 0.25);
        }
        .scroll-top:hover {
            opacity: 1;
            transform: translateY(-3px);
        }
        @media(max-width:480px) {
            .scroll-top {
                bottom: 1rem;
                right: 1rem;
                width: 38px;
                height: 38px;
                font-size: 1rem;
            }
        }