/* ============================================================
           THEME TOKENS — identical to the perfect template
           ============================================================ */
        :root {
            --primary: #FF5421;
            --primary-hover: #E94718;
            --primary-light: #FFF1EC;
            --primary-soft: #FFF7F4;
            --bg: #FFFFFF;
            --bg-secondary: #FFF9F7;
            --surface: #FFFFFF;
            --text-primary: #1F1F1F;
            --text-secondary: #666666;
            --text-muted: #929292;
            --border: #EDEDED;
            --border-light: #F3F3F3;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
            --success: #22C55E;
            --warning: #F59E0B;
            --danger: #EF4444;
            --display: "Bricolage Grotesque", "IBM Plex Sans", sans-serif;
            --body: "IBM Plex Sans", system-ui, sans-serif;
            --mono: "IBM Plex Mono", ui-monospace, monospace;
            --wrap: 1240px;
            --shadow: var(--shadow-sm), var(--shadow-md);
            --header-h: 62px;
            --radius: 10px;
        }

        /* ============================================================
           RESET & BASE — identical
           ============================================================ */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            scroll-padding-top: 84px;
        }
        @media (prefers-reduced-motion: reduce) {
            html {
                scroll-behavior: auto;
            }
            *,
            *::before,
            *::after {
                animation-duration: .001ms !important;
                transition-duration: .001ms !important;
            }
        }
        body {
            margin: 0;
            background: var(--bg-secondary);
            color: var(--text-primary);
            font-family: var(--body);
            font-size: 16.5px;
            line-height: 1.68;
            -webkit-font-smoothing: antialiased;
        }
        img,
        svg {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-underline-offset: 3px;
            transition: all .3s ease;
        }
        a:hover {
            color: var(--primary-hover);
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        summary:focus-visible {
            outline: 3px solid var(--warning);
            outline-offset: 2px;
            border-radius: 4px;
        }
        .wrap {
            max-width: var(--wrap);
            margin: 0 auto;
            padding: 0 22px;
        }
        .eyebrow {
            font-family: var(--mono);
            font-size: 11.5px;
            letter-spacing: .16em;
            text-transform: uppercase;
            color: var(--primary);
            font-weight: 600;
        }

        /* ============================================================
           PROGRESS — identical
           ============================================================ */
        #progress {
            position: fixed;
            top: 0;
            left: 0;
            height: 3px;
            width: 0%;
            background: linear-gradient(90deg, var(--primary), var(--warning));
            z-index: 60;
            transition: width .1s linear;
        }

        /* ============================================================
           HEADER — identical
           ============================================================ */
        header.site {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, .93);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border);
        }
        .hdr {
            display: flex;
            align-items: center;
            gap: 20px;
            height: var(--header-h);
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 9px;
            text-decoration: none;
            color: var(--text-primary);
            flex: none;
        }
        .logo-img {
            height: 30px;
            width: 60px;
            object-fit: contain;
        }
        .logo-txt {
            font-family: var(--display);
            font-weight: 800;
            font-size: 19px;
            letter-spacing: -.02em;
        }
        .logo-txt em {
            font-style: normal;
            color: var(--primary);
        }
        nav.main {
            display: flex;
            gap: 2px;
            flex: 1;
        }
        nav.main a {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            padding: 7px 12px;
            border-radius: 8px;
            transition: all .3s ease;
        }
        nav.main a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        nav.main a[aria-current] {
            background: var(--text-primary);
            color: #fff;
        }
        .hdr-search {
            display: flex;
            align-items: center;
            gap: 8px;
            border: 1px solid var(--border-light);
            background: #fff;
            border-radius: 8px;
            padding: 6px 11px;
            width: 200px;
            flex: none;
        }
        .hdr-search input {
            border: 0;
            outline: 0;
            font: inherit;
            font-size: 14px;
            width: 100%;
            background: transparent;
            min-height: 32px;
        }
        .hdr-search svg {
            flex: none;
            opacity: .55;
        }
        .burger {
            display: none;
            margin-left: auto;
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: 8px;
            padding: 7px 10px;
            font: inherit;
            cursor: pointer;
            min-height: 44px;
            min-width: 44px;
            justify-content: center;
            align-items: center;
        }
        nav.main .mobile-search {
            display: none;
        }

        /* ============================================================
           HERO — API testing theme
           ============================================================ */
        .hero {
            padding: 0 22px;
            background: linear-gradient(180deg, #FFFFFF 0%, var(--bg-secondary) 100%), var(--bg-secondary);
            border-bottom: 1px solid var(--border);
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: "";
            position: absolute;
            inset: 0;
            background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);
            background-size: 34px 34px;
            opacity: .45;
            mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
        }
        .hero-in {
            position: relative;
            display: grid;
            grid-template-columns: 1.02fr .98fr;
            gap: 40px;
            align-items: center;
            padding: 40px 0 30px;
        }
        .hero h1 {
            font-family: var(--display);
            font-size: clamp(30px, 4.2vw, 48px);
            line-height: 1.05;
            letter-spacing: -.032em;
            font-weight: 800;
            margin: 12px 0 12px;
        }
        .hero h1 mark {
            background: linear-gradient(180deg, transparent 62%, var(--primary-soft) 62%);
            color: inherit;
        }
        .hero p.lede {
            font-size: 17px;
            color: var(--text-muted);
            max-width: 48ch;
            margin: 0 0 20px;
        }

        /* search */
        .fx {
            display: flex;
            align-items: stretch;
            background: #fff;
            border-radius: 12px;
            box-shadow: var(--shadow);
            overflow: hidden;
        }
        .fx-tag {
            display: grid;
            place-items: center;
            width: 52px;
            flex: none;
            background: var(--text-primary);
            color: #fff;
            font-family: var(--mono);
            font-size: 15px;
            font-weight: 600;
            font-style: italic;
        }
        .fx input {
            flex: 1;
            border: 0;
            outline: 0;
            font: inherit;
            font-size: 15px;
            padding: 14px 14px;
            background: transparent;
            min-width: 0;
            min-height: 48px;
        }
        .fx button {
            border: 0;
            background: var(--primary);
            color: #fff;
            font: inherit;
            font-weight: 600;
            font-size: 14px;
            padding: 0 20px;
            cursor: pointer;
            flex: none;
            transition: all .3s ease;
            min-height: 48px;
        }
        .fx button:hover {
            background: var(--primary-hover);
        }
        .fx-wrap {
            position: relative;
            max-width: 560px;
        }
        .suggest {
            position: absolute;
            left: 0;
            right: 0;
            top: calc(100% + 8px);
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: 12px;
            box-shadow: var(--shadow);
            padding: 6px;
            z-index: 30;
            display: none;
            max-height: 302px;
            overflow: auto;
        }
        .suggest.open {
            display: block;
        }
        .suggest a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 9px 11px;
            border-radius: 8px;
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 14px;
            min-height: 44px;
        }
        .suggest a:hover,
        .suggest a.hl {
            background: var(--primary-light);
        }
        .suggest .tag {
            font-family: var(--mono);
            font-size: 10px;
            letter-spacing: .08em;
            text-transform: uppercase;
            color: var(--primary);
            border: 1px solid var(--border-light);
            border-radius: 5px;
            padding: 2px 6px;
            margin-left: auto;
            flex: none;
        }
        .suggest .empty {
            padding: 12px;
            color: var(--text-muted);
            font-size: 14px;
        }
        .chips {
            display: flex;
            flex-wrap: wrap;
            gap: 7px;
            margin-top: 18px;
            align-items: center;
        }
        .chips .lbl {
            font-family: var(--mono);
            font-size: 11px;
            letter-spacing: .14em;
            text-transform: uppercase;
            color: var(--text-muted);
            margin-right: 4px;
        }
        .chip {
            font: inherit;
            font-size: 13px;
            font-weight: 500;
            background: #fff;
            color: var(--text-secondary);
            border: 1px solid var(--border-light);
            border-radius: 999px;
            padding: 6px 14px;
            cursor: pointer;
            transition: all .3s ease;
            min-height: 40px;
        }
        .chip:hover {
            border-color: var(--primary);
            color: var(--primary);
        }
        .chip[aria-pressed="true"] {
            background: var(--text-primary);
            border-color: var(--text-primary);
            color: #fff;
        }

        /* demo diagram — API testing flow */
        .demo {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: 14px;
            box-shadow: var(--shadow);
            padding: 14px;
            position: relative;
        }
        .demo-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 0 4px 11px;
            border-bottom: 1px solid var(--border);
            flex-wrap: wrap;
        }
        .demo-bar b {
            font-family: var(--display);
            font-size: 14px;
            letter-spacing: -.01em;
        }
        .demo-bar .live {
            margin-left: auto;
            font-family: var(--mono);
            font-size: 10px;
            letter-spacing: .1em;
            text-transform: uppercase;
            color: var(--success);
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--success);
            animation: pulse 2.2s infinite;
        }
        @keyframes pulse {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: .25;
            }
        }
        .slicer {
            display: flex;
            gap: 5px;
            padding: 11px 4px;
            flex-wrap: wrap;
        }
        .slicer button {
            flex: 1;
            font: inherit;
            font-size: 12px;
            font-weight: 500;
            padding: 6px 4px;
            cursor: pointer;
            border: 1px solid var(--border-light);
            background: #fff;
            color: var(--text-secondary);
            border-radius: 7px;
            transition: all .3s ease;
            min-height: 40px;
        }
        .slicer button[aria-pressed="true"] {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }
        .api-flow {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 8px;
            margin: 8px 0 8px;
        }
        .flow-step {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 9px;
            padding: 9px 8px;
            text-align: center;
        }
        .flow-step .s-l {
            font-family: var(--mono);
            font-size: 9px;
            letter-spacing: .06em;
            text-transform: uppercase;
            color: var(--text-muted);
        }
        .flow-step .s-v {
            font-family: var(--display);
            font-size: 18px;
            font-weight: 800;
            letter-spacing: -.02em;
            line-height: 1.2;
            color: var(--primary);
        }
        .flow-step .s-d {
            font-size: 10px;
            color: var(--text-muted);
            margin-top: 2px;
        }
        .flow-row {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            padding: 4px 0;
            font-family: var(--mono);
            font-size: 11px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .flow-row .arrow {
            color: var(--primary);
            font-size: 18px;
        }
        .demo-cap {
            font-size: 12px;
            color: var(--text-muted);
            text-align: center;
            margin: 10px 4px 2px;
        }

        /* ============================================================
           LAYOUT — MAIN CONTENT — identical structure
           ============================================================ */
        .crumbs {
            font-family: var(--mono);
            font-size: 12px;
            color: var(--text-muted);
            padding: 16px 0 0;
        }
        .crumbs a {
            color: var(--text-muted);
            text-decoration: none;
        }
        .crumbs a:hover {
            color: var(--primary);
        }

        .cols {
            display: grid;
            grid-template-columns: minmax(0, 1fr) 316px;
            gap: 38px;
            align-items: start;
            padding: 18px 0 56px;
        }

        /* ----- ARTICLE ----- */
        article.tut {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 38px 44px 44px;
            box-shadow: var(--shadow);
            min-width: 0;
            overflow: hidden;
            word-wrap: break-word;
        }
        article.tut>* {
            max-width: 100%;
        }
        article.tut h1 {
            font-family: var(--display);
            font-size: clamp(27px, 3.4vw, 40px);
            line-height: 1.1;
            letter-spacing: -.03em;
            font-weight: 800;
            margin: 8px 0 14px;
        }
        article.tut h2 {
            font-family: var(--display);
            font-size: 26px;
            letter-spacing: -.02em;
            font-weight: 700;
            margin: 44px 0 14px;
            padding-top: 14px;
            border-top: 1px solid var(--border);
            scroll-margin-top: 84px;
        }
        article.tut h2 .num {
            font-family: var(--mono);
            font-size: 13px;
            color: var(--primary);
            font-weight: 500;
            display: block;
            letter-spacing: .1em;
            margin-bottom: 4px;
        }
        article.tut h3 {
            font-family: var(--display);
            font-size: 19px;
            font-weight: 700;
            letter-spacing: -.015em;
            margin: 26px 0 8px;
        }
        article.tut p {
            margin: 0 0 15px;
        }
        article.tut ul,
        article.tut ol {
            margin: 0 0 15px;
            padding-left: 22px;
        }
        article.tut li {
            margin-bottom: 7px;
        }

        .byline {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-muted);
            border-bottom: 1px solid var(--border);
            padding-bottom: 18px;
        }
        .avatar {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: grid;
            place-items: center;
            font-family: var(--display);
            font-weight: 700;
            font-size: 15px;
            flex: none;
        }
        .byline b {
            color: var(--text-primary);
            font-weight: 600;
        }
        .byline .sep {
            color: var(--border-light);
        }
        .byline .badge {
            font-family: var(--mono);
            font-size: 10px;
            letter-spacing: .08em;
            text-transform: uppercase;
            background: var(--primary-light);
            color: var(--primary);
            padding: 3px 8px;
            border-radius: 5px;
        }

        figure {
            margin: 24px 0;
        }
        figure svg {
            display: block;
            width: 100%;
            height: auto;
            border: 1px solid var(--border);
            border-radius: 12px;
            background: #fff;
        }
        figcaption {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 9px;
            font-family: var(--mono);
            line-height: 1.5;
        }

        /* answer box */
        .answer {
            border: 1.5px solid var(--text-primary);
            border-radius: 12px;
            padding: 20px 22px;
            margin: 24px 0 8px;
            background: linear-gradient(180deg, #fff, var(--primary-light));
        }
        .answer h2 {
            border: 0 !important;
            margin: 0 0 8px !important;
            padding: 0 !important;
            font-size: 17px !important;
        }
        .answer p {
            margin: 0 0 10px;
            font-size: 16px;
        }
        .answer p:last-child {
            margin: 0;
        }
        .answer ol {
            margin: 10px 0 0;
            padding-left: 20px;
            font-size: 15px;
        }

        /* TOC */
        .toc {
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 18px 22px;
            margin: 26px 0;
            background: var(--bg-secondary);
        }
        .toc h2 {
            margin: 0 0 10px !important;
            border: 0 !important;
            padding: 0 !important;
            font-size: 15px !important;
            font-family: var(--mono) !important;
            letter-spacing: .1em;
            text-transform: uppercase;
            color: var(--text-muted);
            font-weight: 500 !important;
        }
        .toc ol {
            margin: 0;
            padding-left: 0;
            list-style: none;
            columns: 2;
            column-gap: 26px;
        }
        .toc li {
            margin-bottom: 5px;
            break-inside: avoid;
        }
        .toc a {
            display: block;
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 14px;
            padding: 3px 0;
            border-left: 2px solid transparent;
            padding-left: 10px;
            transition: all .3s ease;
            min-height: 36px;
        }
        .toc a:hover {
            color: var(--primary);
        }
        .toc a.active {
            border-left-color: var(--primary);
            color: var(--primary);
            font-weight: 600;
        }
        .toc a .n {
            font-family: var(--mono);
            font-size: 12px;
            color: var(--text-muted);
            margin-right: 7px;
        }

        /* code */
        .code {
            margin: 20px 0;
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--text-primary);
        }
        .code-tabs {
            display: flex;
            background: var(--text-primary);
            padding: 6px 6px 0;
            gap: 3px;
            flex-wrap: wrap;
        }
        .code-tabs button {
            font: inherit;
            font-family: var(--mono);
            font-size: 12px;
            color: #9FB0B4;
            background: transparent;
            border: 0;
            padding: 8px 13px;
            border-radius: 7px 7px 0 0;
            cursor: pointer;
            transition: all .3s ease;
            min-height: 40px;
        }
        .code-tabs button[aria-selected="true"] {
            background: #0A0F14;
            color: #fff;
        }
        .code pre {
            margin: 0;
            background: #0A0F14;
            color: #DCE7E6;
            padding: 18px 20px;
            overflow-x: auto;
            font-family: var(--mono);
            font-size: 13px;
            line-height: 1.75;
            -webkit-overflow-scrolling: touch;
            max-width: 100%;
        }
        .code pre[hidden] {
            display: none;
        }
        .code-foot {
            display: flex;
            align-items: center;
            gap: 10px;
            background: #0A0F14;
            padding: 0 12px 11px;
            flex-wrap: wrap;
        }
        .code-foot .file {
            font-family: var(--mono);
            font-size: 11px;
            color: #6F8286;
        }
        .copy {
            margin-left: auto;
            font: inherit;
            font-family: var(--mono);
            font-size: 11px;
            color: #DCE7E6;
            background: #182028;
            border: 1px solid #2A3742;
            border-radius: 7px;
            padding: 5px 11px;
            cursor: pointer;
            transition: all .3s ease;
            min-height: 40px;
            min-width: 40px;
        }
        .copy:hover {
            background: #22303A;
        }
        .copy.done {
            color: var(--success);
            border-color: #245243;
        }

        code.inl {
            font-family: var(--mono);
            font-size: .9em;
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 5px;
            padding: 1px 5px;
        }

        /* callouts */
        .note {
            border-left: 3px solid var(--primary);
            background: var(--primary-light);
            padding: 14px 18px;
            border-radius: 0 10px 10px 0;
            margin: 20px 0;
            font-size: 15px;
        }
        .note.warn {
            border-left-color: var(--warning);
            background: var(--primary-soft);
        }
        .note b {
            font-family: var(--display);
            letter-spacing: -.01em;
        }

        /* tables */
        .tbl {
            width: 100%;
            border-collapse: collapse;
            margin: 18px 0;
            font-size: 14px;
            min-width: 0;
        }
        .tbl th {
            text-align: left;
            font-family: var(--mono);
            font-size: 11px;
            letter-spacing: .1em;
            text-transform: uppercase;
            color: var(--text-muted);
            font-weight: 500;
            padding: 8px 12px;
            border-bottom: 2px solid var(--border-light);
        }
        .tbl td {
            padding: 11px 12px;
            border-bottom: 1px solid var(--border);
            vertical-align: top;
        }
        .tbl tr:hover td {
            background: var(--bg-secondary);
        }
        .tbl td code {
            font-family: var(--mono);
            font-size: 12px;
            color: var(--danger);
        }
        .scroll-x {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            max-width: 100%;
        }

        /* steps */
        .steps {
            list-style: none;
            padding: 0;
            margin: 20px 0;
            counter-reset: s;
        }
        .steps li {
            position: relative;
            padding: 0 0 22px 46px;
            counter-increment: s;
            border-left: 1px dashed var(--border-light);
            margin-left: 14px;
        }
        .steps li:last-child {
            border-left-color: transparent;
            padding-bottom: 0;
        }
        .steps li::before {
            content: counter(s, decimal-leading-zero);
            position: absolute;
            left: -15px;
            top: -2px;
            width: 30px;
            height: 30px;
            border-radius: 9px;
            background: var(--text-primary);
            color: #fff;
            font-family: var(--mono);
            font-size: 11px;
            display: grid;
            place-items: center;
        }
        .steps li b {
            display: block;
            font-family: var(--display);
            font-size: 17px;
            letter-spacing: -.015em;
            margin-bottom: 3px;
        }

        /* accordions */
        details.acc {
            border: 1px solid var(--border);
            border-radius: 10px;
            margin-bottom: 9px;
            background: #fff;
            overflow: hidden;
        }
        details.acc[open] {
            border-color: var(--border-light);
        }
        details.acc summary {
            cursor: pointer;
            padding: 14px 18px;
            font-weight: 600;
            font-size: 15px;
            list-style: none;
            display: flex;
            gap: 12px;
            align-items: flex-start;
            transition: all .3s ease;
            min-height: 48px;
        }
        details.acc summary::-webkit-details-marker {
            display: none;
        }
        details.acc summary::after {
            content: "+";
            margin-left: auto;
            font-family: var(--mono);
            color: var(--primary);
            font-size: 19px;
            line-height: 1;
            flex: none;
        }
        details.acc[open] summary::after {
            content: "–";
        }
        details.acc summary:hover {
            background: var(--bg-secondary);
        }
        details.acc .body {
            padding: 0 18px 16px;
            font-size: 15px;
            color: var(--text-secondary);
        }
        details.acc .body p {
            margin: 0 0 10px;
        }
        details.acc .body p:last-child {
            margin: 0;
        }
        details.acc .qn {
            font-family: var(--mono);
            font-size: 12px;
            color: var(--primary);
            flex: none;
            padding-top: 3px;
        }

        /* quiz */
        .quiz {
            border: 1.5px solid var(--text-primary);
            border-radius: 14px;
            padding: 24px;
            background: #fff;
            margin: 22px 0;
        }
        .quiz-head {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 6px;
            flex-wrap: wrap;
        }
        .quiz-head h3 {
            margin: 0 !important;
        }
        .score {
            margin-left: auto;
            font-family: var(--mono);
            font-size: 12px;
            background: var(--text-primary);
            color: #fff;
            padding: 5px 12px;
            border-radius: 999px;
        }
        .q {
            border-top: 1px solid var(--border);
            padding: 18px 0 4px;
        }
        .q p.qt {
            font-weight: 600;
            margin: 0 0 12px;
        }
        .q p.qt span {
            font-family: var(--mono);
            color: var(--primary);
            font-size: 13px;
            margin-right: 8px;
        }
        .opts {
            display: grid;
            gap: 7px;
        }
        .opt {
            text-align: left;
            font: inherit;
            font-size: 15px;
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: 9px;
            padding: 10px 14px;
            cursor: pointer;
            display: flex;
            gap: 10px;
            align-items: flex-start;
            transition: all .3s ease;
            min-height: 48px;
        }
        .opt:hover:not(:disabled) {
            border-color: var(--primary);
            background: var(--primary-light);
        }
        .opt .mk {
            font-family: var(--mono);
            font-size: 12px;
            color: var(--text-muted);
            flex: none;
            padding-top: 2px;
        }
        .opt.correct {
            border-color: var(--success);
            background: #E6F5EF;
        }
        .opt.wrong {
            border-color: var(--danger);
            background: #FBEAE7;
        }
        .opt:disabled {
            cursor: default;
            opacity: .92;
        }
        .explain {
            margin-top: 10px;
            font-size: 14px;
            padding: 11px 14px;
            border-radius: 9px;
            background: var(--bg-secondary);
            border-left: 3px solid var(--primary);
            display: none;
        }
        .explain.show {
            display: block;
        }
        .quiz-done {
            margin-top: 18px;
            padding: 16px;
            border-radius: 10px;
            background: var(--primary-light);
            font-size: 15px;
            display: none;
        }
        .quiz-done.show {
            display: block;
        }

        /* related cards */
        .rel-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
            margin: 18px 0;
        }
        .rel-card {
            display: block;
            text-decoration: none;
            color: inherit;
            border: 1px solid var(--border);
            border-radius: 11px;
            padding: 15px 17px;
            background: #fff;
            transition: all .3s ease;
            min-height: 70px;
        }
        .rel-card:hover {
            border-color: var(--primary);
            background: var(--primary-light);
        }
        .rel-card .t {
            font-family: var(--display);
            font-weight: 700;
            font-size: 15px;
            letter-spacing: -.01em;
            display: block;
            margin-bottom: 3px;
        }
        .rel-card .m {
            font-family: var(--mono);
            font-size: 11px;
            color: var(--text-muted);
            letter-spacing: .06em;
            text-transform: uppercase;
        }

        /* enroll CTA */
        .enroll {
            margin: 38px 0 0;
            background: var(--text-primary);
            color: #fff;
            border-radius: 14px;
            padding: 32px 34px;
            position: relative;
            overflow: hidden;
        }
        .enroll::after {
            content: "";
            position: absolute;
            right: -40px;
            bottom: -60px;
            width: 230px;
            height: 230px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(255, 84, 33, .28), transparent 65%);
        }
        .enroll h3 {
            font-family: var(--display);
            font-size: 25px;
            letter-spacing: -.025em;
            margin: 8px 0 10px !important;
            color: #fff;
        }
        .enroll p {
            color: #B9C7CB;
            margin: 0 0 18px;
            max-width: 52ch;
        }
        .enroll .price {
            font-family: var(--mono);
            font-size: 14px;
            color: var(--warning);
            margin-bottom: 16px;
            display: block;
        }
        .enroll .price s {
            color: #7E9096;
            margin-left: 8px;
        }
        .btn-row {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            position: relative;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
            padding: 12px 22px;
            border-radius: 9px;
            cursor: pointer;
            border: 1px solid transparent;
            font-family: var(--body);
            transition: all .3s ease;
            min-height: 48px;
            justify-content: center;
        }
        .btn-primary {
            background: var(--warning);
            color: var(--text-primary);
        }
        .btn-primary:hover {
            background: #f5b52d;
        }
        .btn-ghost {
            border-color: #3A4954;
            color: #fff;
            background: transparent;
        }
        .btn-ghost:hover {
            background: #1C262F;
        }
        .enroll ul {
            display: flex;
            flex-wrap: wrap;
            gap: 6px 20px;
            padding: 0;
            list-style: none;
            margin: 20px 0 0;
            font-size: 13px;
            color: #B9C7CB;
            font-family: var(--mono);
        }
        .enroll ul li::before {
            content: "✓ ";
            color: var(--warning);
        }

        /* ============================================================
           SIDEBAR — identical
           ============================================================ */
        aside.side {
            position: sticky;
            top: calc(var(--header-h) + 16px);
            display: grid;
            gap: 14px;
        }
        .s-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 18px;
            box-shadow: var(--shadow);
        }
        .s-card h4 {
            font-family: var(--mono);
            font-size: 11px;
            letter-spacing: .12em;
            text-transform: uppercase;
            color: var(--text-muted);
            margin: 0 0 12px;
            font-weight: 500;
        }
        .s-demo {
            background: var(--text-primary);
            color: #fff;
            border-color: transparent;
        }
        .s-demo h4 {
            color: #B9C7CB;
        }
        .s-demo .big {
            font-family: var(--display);
            font-size: 21px;
            font-weight: 800;
            letter-spacing: -.02em;
            line-height: 1.2;
            margin-bottom: 8px;
        }
        .s-demo p {
            font-size: 13px;
            color: #B9C7CB;
            margin: 0 0 14px;
        }
        .s-demo .btn {
            width: 100%;
            justify-content: center;
            padding: 11px;
        }
        .s-demo .meta {
            font-family: var(--mono);
            font-size: 11px;
            color: #B9C7CB;
            margin-top: 10px;
            text-align: center;
        }
        .s-list {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .s-list li {
            border-bottom: 1px solid var(--border);
        }
        .s-list li:last-child {
            border: 0;
        }
        .s-list a {
            display: flex;
            gap: 10px;
            padding: 9px 0;
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.4;
            transition: all .3s ease;
            min-height: 44px;
            align-items: center;
        }
        .s-list a:hover {
            color: var(--primary);
        }
        .s-list .rank {
            font-family: var(--mono);
            font-size: 11px;
            color: var(--primary);
            flex: none;
            padding-top: 2px;
        }
        .s-pdf {
            display: flex;
            gap: 12px;
            align-items: center;
            width: 100%;
            text-align: left;
            font: inherit;
            background: #fff;
            border: 1px dashed var(--border-light);
            border-radius: 12px;
            padding: 16px 18px;
            cursor: pointer;
            transition: all .3s ease;
            min-height: 56px;
        }
        .s-pdf:hover {
            border-color: var(--primary);
            background: var(--primary-light);
        }
        .s-pdf .t {
            font-weight: 600;
            font-size: 14px;
            display: block;
        }
        .s-pdf .m {
            font-family: var(--mono);
            font-size: 11px;
            color: var(--text-muted);
        }
        .s-banner {
            background: var(--text-primary);
            color: #fff;
            border-color: transparent;
            text-align: left;
        }
        .s-banner .kicker {
            font-family: var(--mono);
            font-size: 10px;
            letter-spacing: .12em;
            text-transform: uppercase;
            color: var(--warning);
        }
        .s-banner .t {
            font-family: var(--display);
            font-size: 19px;
            font-weight: 800;
            letter-spacing: -.02em;
            margin: 6px 0 8px;
            line-height: 1.2;
        }
        .s-banner p {
            font-size: 13px;
            color: #B9C7CB;
            margin: 0 0 14px;
        }
        .s-banner .btn {
            width: 100%;
            justify-content: center;
            padding: 10px;
            font-size: 14px;
        }
        .place {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
        }
        .place div {
            background: var(--bg-secondary);
            border-radius: 9px;
            padding: 10px 12px;
        }
        .place .v {
            font-family: var(--display);
            font-size: 20px;
            font-weight: 800;
            letter-spacing: -.02em;
            color: var(--primary);
        }
        .place .l {
            font-family: var(--mono);
            font-size: 10px;
            letter-spacing: .06em;
            text-transform: uppercase;
            color: var(--text-muted);
            line-height: 1.4;
        }
        .s-note {
            font-size: 11px;
            color: var(--text-muted);
            margin-top: 10px;
            line-height: 1.5;
        }

        /* ============================================================
           BOTTOM BAND — identical
           ============================================================ */
        .band {
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 44px 0;
        }
        .band-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 34px;
        }
        .band h3 {
            font-family: var(--display);
            font-size: 16px;
            letter-spacing: -.01em;
            margin: 0 0 4px;
        }
        .band .sub {
            font-family: var(--mono);
            font-size: 10px;
            letter-spacing: .1em;
            text-transform: uppercase;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .band ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .band li {
            margin-bottom: 9px;
        }
        .band a {
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.45;
            display: block;
            transition: all .3s ease;
            min-height: 36px;
        }
        .band a:hover {
            color: var(--primary);
        }
        .band a small {
            display: block;
            font-family: var(--mono);
            font-size: 11px;
            color: var(--text-muted);
        }

        /* ============================================================
           FOOTER — identical
           ============================================================ */
        footer.site {
            background: var(--text-primary);
            color: #B9C7CB;
            padding: 46px 0 26px;
            font-size: 14px;
        }
        .f-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 34px;
        }
        footer.site h5 {
            font-family: var(--mono);
            font-size: 11px;
            letter-spacing: .12em;
            text-transform: uppercase;
            color: #fff;
            margin: 0 0 13px;
            font-weight: 500;
        }
        footer.site ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        footer.site li {
            margin-bottom: 8px;
        }
        footer.site a {
            color: #B9C7CB;
            text-decoration: none;
            transition: all .3s ease;
            min-height: 36px;
            display: inline-block;
        }
        footer.site a:hover {
            color: var(--warning);
        }
        footer.site .about {
            max-width: 34ch;
            line-height: 1.65;
        }
        .f-logo {
            display: flex;
            align-items: center;
            gap: 9px;
            margin-bottom: 12px;
        }
        .f-bot {
            border-top: 1px solid #2A3742;
            margin-top: 34px;
            padding-top: 18px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: space-between;
            font-size: 12px;
            font-family: var(--mono);
            color: #7E9096;
        }

        /* ============================================================
           RESPONSIVE — identical to perfect template
           ============================================================ */

        /* --- 1400px+ (XL) --- */
        @media (min-width: 1400px) {
            .wrap {
                padding: 0 50px;
                max-width: 1300px;
            }
            .hero-in {
                padding-top: 30px;
                gap: 50px;
            }
            .hero h1 {
                font-size: clamp(38px, 4.5vw, 54px);
            }
        }

        /* --- 1024px–1399px (desktop) --- */
        @media (max-width: 1399px) {
            .hero-in {
                gap: 34px;
            }
            .cols {
                gap: 30px;
                grid-template-columns: minmax(0, 1fr) 280px;
            }
            aside.side {
                width: 280px;
            }
        }

        /* --- 768px–1023px (tablet landscape) --- */
        @media (max-width: 1024px) {
            .wrap {
                padding: 0 20px;
            }
            .hero-in {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
                padding: 30px 0 24px;
            }
            .hero h1 {
                font-size: clamp(28px, 4vw, 38px);
            }
            .hero p.lede {
                font-size: 16px;
            }
            .cols {
                grid-template-columns: 1fr;
                gap: 26px;
                padding: 12px 0 36px;
            }
            aside.side {
                position: static;
                grid-template-columns: repeat(2, 1fr);
                width: 100%;
            }
            article.tut {
                padding: 30px 28px 34px;
            }
            article.tut h2 {
                font-size: 24px;
            }
            .band-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 28px;
            }
            .f-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .toc ol {
                columns: 2;
            }
            .hdr-search {
                width: 160px;
            }
            .api-flow {
                grid-template-columns: 1fr 1fr 1fr;
            }
            .slicer button {
                font-size: 12px;
                padding: 8px 4px;
            }
            .rel-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        /* --- 480px–767px (tablet portrait / small tablet) --- */
        @media (max-width: 768px) {
            body {
                font-size: 15px;
            }
            .wrap {
                padding: 0 16px;
            }

            /* header */
            nav.main {
                display: none;
            }
            nav.main.open {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: #fff;
                padding: 12px 16px 16px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-md);
                gap: 4px;
                z-index: 100;
            }
            nav.main.open a {
                padding: 12px 14px;
                font-size: 16px;
                border-radius: 8px;
                min-height: 48px;
            }
            nav.main.open .mobile-search {
                display: flex;
                align-items: center;
                gap: 8px;
                margin-bottom: 8px;
                border: 1px solid var(--border-light);
                border-radius: 8px;
                padding: 6px 12px;
                background: var(--bg-secondary);
            }
            nav.main.open .mobile-search input {
                border: 0;
                outline: 0;
                font: inherit;
                font-size: 14px;
                width: 100%;
                background: transparent;
                min-height: 36px;
            }
            nav.main.open .mobile-search svg {
                flex: none;
                opacity: .5;
            }
            .burger {
                display: flex;
            }
            .hdr-search {
                display: none;
            }
            .hdr {
                gap: 12px;
            }

            /* hero */
            .hero {
                padding: 0 16px;
            }
            .hero-in {
                grid-template-columns: 1fr;
                gap: 24px;
                padding: 20px 0 18px;
            }
            .hero h1 {
                font-size: clamp(26px, 6vw, 36px);
            }
            .hero p.lede {
                font-size: 15px;
            }
            .fx-tag {
                width: 40px;
                font-size: 13px;
            }
            .fx input {
                font-size: 14px;
                padding: 12px 12px;
                min-height: 44px;
            }
            .fx button {
                font-size: 13px;
                padding: 0 14px;
                min-height: 44px;
            }
            .suggest {
                max-height: 200px;
            }
            .suggest a {
                padding: 10px 12px;
                font-size: 14px;
                min-height: 44px;
            }
            .chip {
                font-size: 12px;
                padding: 6px 12px;
                min-height: 40px;
            }

            /* demo */
            .demo {
                padding: 10px;
            }
            .demo-bar b {
                font-size: 13px;
            }
            .demo-bar .live {
                font-size: 9px;
            }
            .slicer button {
                font-size: 11px;
                padding: 8px 4px;
                min-height: 40px;
            }
            .api-flow {
                grid-template-columns: 1fr;
                gap: 6px;
            }
            .flow-step .s-v {
                font-size: 16px;
            }
            .flow-row {
                font-size: 10px;
                gap: 4px;
            }
            .flow-row .arrow {
                font-size: 15px;
            }
            .demo-cap {
                font-size: 11px;
            }

            /* article */
            article.tut {
                padding: 22px 18px 26px;
                border-radius: 12px;
                overflow: hidden;
            }
            article.tut h1 {
                font-size: clamp(24px, 5vw, 32px);
            }
            article.tut h2 {
                font-size: 21px;
                margin: 30px 0 12px;
                padding-top: 10px;
            }
            article.tut h2 .num {
                font-size: 12px;
            }
            article.tut h3 {
                font-size: 17px;
                margin: 20px 0 6px;
            }
            article.tut p {
                margin-bottom: 12px;
                font-size: 14.5px;
            }
            article.tut ul,
            article.tut ol {
                padding-left: 18px;
                font-size: 14.5px;
            }
            article.tut li {
                margin-bottom: 6px;
            }

            .byline {
                font-size: 13px;
                gap: 6px;
            }
            .byline .sep {
                display: none;
            }
            .byline .badge {
                font-size: 10px;
            }
            .avatar {
                width: 34px;
                height: 34px;
                font-size: 13px;
            }

            figure {
                margin: 16px 0;
            }
            figcaption {
                font-size: 12px;
            }

            .answer {
                padding: 14px 16px;
                margin: 16px 0 6px;
            }
            .answer h2 {
                font-size: 16px !important;
            }
            .answer p {
                font-size: 14px;
            }
            .answer ol {
                font-size: 14px;
                padding-left: 16px;
            }

            .toc {
                padding: 14px 16px;
                margin: 18px 0;
            }
            .toc h2 {
                font-size: 13px !important;
            }
            .toc ol {
                columns: 1;
            }
            .toc a {
                font-size: 14px;
                padding: 6px 0 6px 10px;
                min-height: 40px;
            }
            .toc a .n {
                font-size: 11px;
            }

            .code {
                margin: 14px 0;
                border-radius: 10px;
            }
            .code-tabs button {
                font-size: 11px;
                padding: 6px 10px;
                min-height: 38px;
            }
            .code pre {
                font-size: 12px;
                padding: 14px 16px;
            }
            .code-foot {
                padding: 0 10px 9px;
                gap: 6px;
            }
            .code-foot .file {
                font-size: 10px;
            }
            .copy {
                font-size: 10px;
                padding: 4px 10px;
                min-height: 36px;
                min-width: 36px;
            }
            code.inl {
                font-size: .85em;
            }

            .note {
                padding: 12px 14px;
                font-size: 14px;
                margin: 14px 0;
            }

            .tbl {
                font-size: 12px;
                min-width: 0;
            }
            .tbl th,
            .tbl td {
                padding: 6px 8px;
            }
            .tbl td code {
                font-size: 11px;
            }
            .scroll-x {
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                max-width: 100%;
            }

            .steps {
                margin: 14px 0;
            }
            .steps li {
                padding: 0 0 16px 36px;
                margin-left: 10px;
            }
            .steps li::before {
                width: 26px;
                height: 26px;
                font-size: 10px;
                left: -13px;
                top: -1px;
            }
            .steps li b {
                font-size: 15px;
            }

            details.acc summary {
                padding: 12px 14px;
                font-size: 14px;
                min-height: 44px;
            }
            details.acc .body {
                padding: 0 14px 12px;
                font-size: 14px;
            }
            details.acc .qn {
                font-size: 11px;
            }

            .quiz {
                padding: 16px;
                margin: 16px 0;
                border-radius: 12px;
            }
            .quiz-head h3 {
                font-size: 16px !important;
            }
            .score {
                font-size: 11px;
                padding: 4px 10px;
            }
            .q p.qt {
                font-size: 14px;
            }
            .q p.qt span {
                font-size: 12px;
            }
            .opt {
                font-size: 14px;
                padding: 10px 12px;
                min-height: 44px;
            }
            .opt .mk {
                font-size: 11px;
            }
            .explain {
                font-size: 13px;
                padding: 10px 12px;
            }
            .quiz-done {
                font-size: 14px;
                padding: 12px 14px;
            }

            .rel-grid {
                grid-template-columns: 1fr;
                gap: 10px;
            }
            .rel-card {
                padding: 12px 14px;
                min-height: 60px;
            }
            .rel-card .t {
                font-size: 14px;
            }
            .rel-card .m {
                font-size: 10px;
            }

            .enroll {
                margin: 24px 0 0;
                padding: 20px 16px;
                border-radius: 12px;
            }
            .enroll h3 {
                font-size: 20px;
            }
            .enroll p {
                font-size: 14px;
            }
            .enroll .price {
                font-size: 13px;
            }
            .btn-row {
                flex-direction: column;
            }
            .btn {
                width: 100%;
                justify-content: center;
                padding: 12px 16px;
                font-size: 14px;
                min-height: 44px;
            }
            .enroll ul {
                font-size: 12px;
                gap: 4px 14px;
                margin: 14px 0 0;
            }
            .enroll::after {
                width: 150px;
                height: 150px;
                right: -30px;
                bottom: -40px;
            }

            /* sidebar */
            aside.side {
                position: static;
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .s-card {
                padding: 14px 16px;
            }
            .s-demo .big {
                font-size: 18px;
            }
            .s-demo p {
                font-size: 13px;
            }
            .s-pdf {
                padding: 12px 14px;
                min-height: 48px;
            }
            .s-pdf .t {
                font-size: 13px;
            }
            .s-pdf .m {
                font-size: 10px;
            }
            .s-banner .t {
                font-size: 17px;
            }
            .place {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .place div {
                padding: 8px 10px;
            }
            .place .v {
                font-size: 17px;
            }
            .s-note {
                font-size: 11px;
            }

            .band {
                padding: 30px 0;
            }
            .band-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .band h3 {
                font-size: 15px;
            }
            .band a {
                font-size: 14px;
                min-height: 34px;
            }
            .band a small {
                font-size: 10px;
            }

            footer.site {
                padding: 30px 0 18px;
            }
            .f-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            footer.site h5 {
                font-size: 10px;
                margin-bottom: 10px;
            }
            footer.site a {
                font-size: 13px;
                min-height: 32px;
            }
            footer.site .about {
                max-width: 100%;
                font-size: 13px;
            }
            .f-logo .logo-txt {
                font-size: 17px;
            }
            .f-bot {
                flex-direction: column;
                align-items: center;
                text-align: center;
                font-size: 11px;
                gap: 6px;
                margin-top: 24px;
                padding-top: 14px;
            }

            .crumbs {
                font-size: 11px;
                padding: 12px 0 0;
            }
            #progress {
                height: 2px;
            }

            /* touch targets */
            .chip,
            .slicer button,
            .opt,
            .btn,
            .acc summary,
            .s-pdf,
            .copy,
            .burger,
            .fx button,
            .fx input,
            .toc a,
            .band a,
            footer.site a,
            .s-list a,
            .rel-card {
                min-height: 44px;
            }
            .slicer button {
                flex: 1 1 auto;
                min-width: 60px;
            }
        }

        /* --- 320px–479px (mobile small) --- */
        @media (max-width: 480px) {
            body {
                font-size: 14px;
            }
            .hero {
                padding: 0;
            }
            .wrap {
                padding: 0 12px;
            }

            article.tut {
                padding: 16px 12px 20px;
                border-radius: 8px;
            }
            article.tut h1 {
                font-size: clamp(22px, 5.5vw, 28px);
            }
            article.tut h2 {
                font-size: 18px;
                margin: 24px 0 10px;
                padding-top: 8px;
            }
            article.tut h3 {
                font-size: 15px;
                margin: 16px 0 4px;
            }
            article.tut p {
                font-size: 13.5px;
                margin-bottom: 10px;
            }
            article.tut ul,
            article.tut ol {
                padding-left: 16px;
                font-size: 13.5px;
            }

            .hero h1 {
                font-size: clamp(24px, 5vw, 30px);
            }
            .hero p.lede {
                font-size: 14px;
            }
            .fx-tag {
                width: 34px;
                font-size: 11px;
            }
            .fx input {
                font-size: 13px;
                padding: 10px 10px;
                min-height: 40px;
            }
            .fx button {
                font-size: 12px;
                padding: 0 10px;
                min-height: 40px;
            }
            .chip {
                font-size: 11px;
                padding: 4px 10px;
                min-height: 36px;
            }

            .demo-bar b {
                font-size: 12px;
            }
            .slicer button {
                font-size: 10px;
                padding: 6px 3px;
                min-height: 36px;
            }
            .flow-step .s-v {
                font-size: 14px;
            }
            .flow-step .s-l {
                font-size: 8px;
            }
            .flow-step .s-d {
                font-size: 9px;
            }

            .answer {
                padding: 12px 12px;
            }
            .answer h2 {
                font-size: 15px !important;
            }
            .answer p {
                font-size: 13px;
            }
            .answer ol {
                font-size: 13px;
                padding-left: 14px;
            }

            .toc {
                padding: 12px 14px;
            }
            .toc a {
                font-size: 13px;
                padding: 5px 0 5px 8px;
                min-height: 34px;
            }

            .code pre {
                font-size: 11px;
                padding: 10px 12px;
            }
            .code-tabs button {
                font-size: 10px;
                padding: 5px 8px;
                min-height: 34px;
            }
            .copy {
                font-size: 9.5px;
                padding: 3px 8px;
                min-height: 32px;
                min-width: 32px;
            }

            .note {
                font-size: 13px;
                padding: 10px 12px;
            }

            .tbl {
                font-size: 11px;
            }
            .tbl th,
            .tbl td {
                padding: 4px 6px;
            }
            .tbl td code {
                font-size: 10px;
            }

            .steps li {
                padding: 0 0 14px 32px;
                margin-left: 8px;
            }
            .steps li::before {
                width: 22px;
                height: 22px;
                font-size: 9px;
                left: -11px;
            }
            .steps li b {
                font-size: 14px;
            }

            details.acc summary {
                font-size: 13px;
                padding: 10px 12px;
                min-height: 40px;
            }
            details.acc .body {
                font-size: 13px;
                padding: 0 12px 10px;
            }

            .quiz {
                padding: 12px;
            }
            .opt {
                font-size: 13px;
                padding: 8px 10px;
                min-height: 40px;
            }
            .opt .mk {
                font-size: 10px;
            }
            .explain {
                font-size: 12px;
                padding: 8px 10px;
            }
            .quiz-done {
                font-size: 13px;
                padding: 10px 12px;
            }

            .rel-card {
                padding: 10px 12px;
                min-height: 50px;
            }
            .rel-card .t {
                font-size: 13px;
            }

            .enroll {
                padding: 16px 12px;
            }
            .enroll h3 {
                font-size: 18px;
            }
            .enroll p {
                font-size: 13px;
            }
            .btn {
                font-size: 13px;
                padding: 10px 14px;
                min-height: 40px;
            }
            .enroll ul {
                font-size: 11px;
                gap: 3px 10px;
            }

            .s-card {
                padding: 12px 14px;
            }
            .s-demo .big {
                font-size: 16px;
            }
            .s-pdf {
                padding: 10px 12px;
                min-height: 44px;
            }
            .s-pdf .t {
                font-size: 12px;
            }
            .s-banner .t {
                font-size: 15px;
            }
            .place .v {
                font-size: 15px;
            }

            .band {
                padding: 24px 0;
            }
            .band h3 {
                font-size: 14px;
            }
            .band a {
                font-size: 13px;
                min-height: 32px;
            }

            footer.site {
                padding: 24px 0 14px;
            }
            footer.site a {
                font-size: 12px;
            }
            .f-bot {
                font-size: 10px;
            }
            .crumbs {
                font-size: 10px;
                padding: 8px 0 0;
            }
        }

        /* ============================================================
           PRINT
           ============================================================ */
        @media print {
            header.site,
            .hero,
            aside.side,
            .band,
            footer.site,
            .quiz,
            .enroll,
            #progress,
            .copy,
            .burger,
            .hdr-search,
            .fx-wrap,
            .chips,
            .slicer,
            .demo-cap,
            .flow-row,
            .demo-bar .live {
                display: none !important;
            }
            body {
                background: #fff;
                font-size: 12pt;
            }
            article.tut {
                border: 0;
                box-shadow: none;
                padding: 0;
                border-radius: 0;
            }
            .code {
                border: 1px solid #ccc;
                border-radius: 4px;
            }
            .code pre {
                background: #f9f9f9;
                color: #000;
                border: 0;
                padding: 12px;
                font-size: 10pt;
                overflow: visible;
            }
            .code-tabs {
                background: #eee;
                padding: 4px 4px 0;
            }
            .code-tabs button {
                color: #333;
                background: #ddd;
                padding: 4px 10px;
                border-radius: 4px 4px 0 0;
            }
            .code-tabs button[aria-selected="true"] {
                background: #f9f9f9;
                color: #000;
            }
            .code pre[hidden] {
                display: none !important;
            }
            .toc {
                border: 1px solid #ccc;
                background: #f9f9f9;
                break-inside: avoid;
            }
            .answer,
            .note {
                border: 1px solid #ccc;
                background: #f9f9f9;
            }
            .tbl {
                font-size: 10pt;
            }
            .tbl th,
            .tbl td {
                padding: 4px 6px;
            }
            .steps li::before {
                background: #333;
                color: #fff;
            }
            .wrap {
                max-width: 100%;
                padding: 0;
            }
            .cols {
                display: block;
                padding: 0;
            }
            .byline {
                border-bottom: 1px solid #ccc;
            }
            .rel-grid {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .rel-card {
                border: 1px solid #ccc;
                padding: 10px 12px;
            }
            .enroll {
                display: none !important;
            }
            figure svg {
                border: 1px solid #ccc;
                max-width: 100%;
            }
            details.acc {
                border: 1px solid #ccc;
                break-inside: avoid;
            }
            details.acc summary {
                font-weight: 600;
            }
            details.acc .body {
                padding: 0 12px 10px;
            }
            .note.warn {
                border-left-color: #f59e0b;
            }
        }
    </style>