:root{color-scheme:dark;--bg:#161616;--side:#1e1e1e;--panel:#202020;--raised:#272a30;--code:#24272e;--line:#303033;--text:#e9e9eb;--muted:#a0a0a9;--dim:#72727d;--accent:#29f1ff;--accent-bg:#123438;--hover:#2b2b2f;--preview:#1b1b1b;--field:#282828;--field-border:#444448;--key:#9cdcfe;--string:#b1d48b;--keyword:#ce92d5;--number:#ddb27e;--comment:#7f8794;--shadow:0 20px 70px #0006}
:root[data-theme=light]{color-scheme:light;--bg:#fff;--side:#f8f9fb;--panel:#f7f8fa;--raised:#fff;--code:#f5f6f8;--line:#e7e8ec;--text:#242833;--muted:#656b78;--dim:#8b919c;--accent:#009faa;--accent-bg:#e0f4f4;--hover:#edf0f3;--preview:#fafbfc;--field:#fff;--field-border:#d7dae0;--key:#006a98;--string:#397438;--keyword:#9956a8;--number:#a96822;--comment:#7e8694;--shadow:0 20px 70px #26304a26}
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.doc-list strong{color:var(--text);font-weight:600}.doc-links{display:flex;flex-wrap:wrap;gap:10px 22px;margin:18px 0;color:var(--accent);font-size:13px}.doc-links a:hover{text-decoration:underline;text-underline-offset:4px}.license-section{border-top:1px solid var(--line);padding-top:30px;margin-top:46px}.license-callout{background:var(--accent-bg);border-left:4px solid var(--accent);border-radius:7px;padding:16px 20px;margin:25px 0 0}.license-callout h3{display:flex;align-items:center;gap:8px;font-size:14px;line-height:1.6;margin:0 0 10px}.license-callout h3 svg{width:18px;height:18px;flex-shrink:0}.license-callout p{color:var(--text);margin:0;font-size:14px;line-height:1.85}
.preview-stage.preview-code{display:block;overflow-x:auto;padding:0;scrollbar-width:thin}.preview-code .qt-shot{max-width:none;width:760px;border-radius:0}.preview-caption a{color:var(--accent);white-space:nowrap}
.intro-tags{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0 18px}.intro-tags span{font-size:11px;line-height:1.5;border:1px solid var(--line);border-radius:4px;padding:4px 9px;color:var(--muted);background:var(--panel)}.intro-tags span:last-child{color:var(--accent);background:var(--accent-bg);border-color:transparent}.intro-cover{margin:0 0 30px;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--panel)}.intro-cover-top{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-bottom:1px solid var(--line);font-size:10px;letter-spacing:.5px;color:var(--dim);gap:12px}.intro-cover-top a{color:var(--accent);letter-spacing:0;white-space:nowrap}.intro-cover>img{display:block;width:100%;height:auto;background:#fff}.intro-cover figcaption{font-size:11px;line-height:1.8;color:var(--muted);padding:11px 15px;border-top:1px solid var(--line)}.intro-gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:23px 0 8px}.intro-card{display:flex;flex-direction:column;min-width:0;border:1px solid var(--line);border-radius:8px;overflow:hidden;transition:border-color .15s;background:var(--bg)}.intro-card:hover{border-color:var(--accent);color:var(--text)}.intro-card-image{height:164px;display:flex;align-items:center;justify-content:center;padding:15px;background:#fafbfc;border-bottom:1px solid var(--line)}.intro-card-image img{display:block;max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain}.intro-card-copy{padding:17px 20px 18px}.intro-card-number{display:block;font:10px Consolas,monospace;letter-spacing:1px;color:var(--dim);margin-bottom:8px}.intro-card h3{font-size:16px;line-height:1.5;margin:0;color:var(--text);display:flex;align-items:center;justify-content:space-between;gap:10px}.intro-card h3 span{color:var(--dim);font-size:14px;font-weight:400}.intro-card:hover h3 span{color:var(--accent)}.intro-card p{font-size:12px;line-height:1.85;margin:9px 0 13px}.intro-card small{display:block;font:10px/1.6 Consolas,"Cascadia Code",monospace;color:var(--dim);overflow-wrap:anywhere}.migration-visual{display:grid;grid-template-columns:minmax(0,1fr) 24px minmax(0,1fr);align-items:center;gap:13px;margin:22px 0;background:var(--panel);padding:21px;border:1px solid var(--line);border-radius:8px}.migration-panel{min-width:0;padding:16px 14px;border:1px solid var(--line);border-radius:6px;background:var(--bg)}.migration-label{display:block;font-size:11px;color:var(--muted);margin-bottom:11px}.migration-panel>code{display:block;font-size:11px;line-height:1.9;padding:0;background:none;overflow-wrap:anywhere}.migration-panel strong{font-weight:600;color:var(--key)}.migration-after{border-color:var(--accent)}.migration-after .migration-label{color:var(--accent)}.migration-arrow{font-size:20px;text-align:center;color:var(--dim)}.migration-shared{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:7px 10px;align-items:center;border-top:1px solid var(--line);margin-top:4px;padding-top:14px;font-size:11px;color:var(--muted)}.migration-shared>span{margin-right:auto}.migration-shared code{font-size:10px}.intro-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:22px 0}.intro-step{border:1px solid var(--line);border-radius:7px;padding:18px;background:var(--panel);display:flex;flex-direction:column;align-items:flex-start}.intro-step:hover{border-color:var(--accent)}.intro-step-number{display:grid;place-items:center;width:26px;height:26px;background:var(--accent-bg);color:var(--accent);border-radius:50%;font:12px Consolas,monospace}.intro-step h3{font-size:14px;color:var(--text);margin:13px 0 0}.intro-step p{font-size:12px;line-height:1.85;margin:8px 0 15px}.intro-step-link{margin-top:auto;font-size:11px;color:var(--accent)}@media(max-width:780px){.intro-gallery{gap:14px}.intro-card-copy{padding:15px}.intro-card-image{height:148px;padding:12px}.intro-steps{grid-template-columns:1fr}.intro-step{padding:17px 19px}.intro-cover-top{padding:9px 12px;font-size:9px}.intro-cover figcaption{font-size:10px;padding:9px 12px}.migration-visual{grid-template-columns:1fr;padding:16px;gap:12px}.migration-arrow{transform:rotate(90deg);line-height:1}.migration-panel>code{font-size:12px}.migration-shared>span{flex-basis:100%}}@media(max-width:600px){.intro-gallery{grid-template-columns:1fr}.intro-card-image{height:172px}.intro-card-copy{padding:17px 19px}.intro-card h3{font-size:16px}}

/* Recorded Qt motion previews retain their natural size in either site theme. */
.intro-motion{margin:0 0 30px}.intro-motion .animation-preview{margin:0}.intro-motion-caption{margin:10px 0 0;color:var(--muted);font-size:12px;line-height:1.8}
.animation-preview{margin:18px 0 22px}
.preview-stage.preview-animation{background:#fafbfc;padding:16px;min-height:0}
.preview-animation .qt-shot{width:auto;max-width:100%;height:auto}
.animation-preview .preview-caption{gap:12px;flex-wrap:wrap}
.animation-controls{display:flex;align-items:center;gap:16px}
.animation-controls button{border:1px solid var(--line);border-radius:5px;padding:3px 10px;color:var(--text);background:var(--bg);font-size:11px;line-height:1.6;white-space:nowrap}
.animation-controls button:hover{border-color:var(--accent);color:var(--accent)}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* C backend overview and measured performance. */
.backend-layers{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;padding:0;margin:22px 0;list-style:none}
.backend-layers>li{position:relative;min-width:0;padding:19px 17px;border:1px solid var(--line);border-radius:9px;background:var(--panel)}
.backend-layers>li:nth-child(2){background:var(--accent-bg);border-color:var(--accent)}
.backend-layers>li:not(:last-child):after{content:'→';position:absolute;right:-18px;top:30px;color:var(--muted);font-size:15px}
.backend-layer-head{display:flex;align-items:center;flex-wrap:wrap;gap:9px;line-height:1.4}
.backend-layer-head>span{font:650 22px Consolas,'Cascadia Code',monospace;color:var(--accent)}
.backend-layer-head>strong{font-size:12px;font-weight:600}
.backend-layers p{font-size:12px;color:var(--muted);line-height:1.8;margin:12px 0 0}
.native-metrics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:22px 0}
.native-metrics>div{min-width:0;padding:20px 22px;border:1px solid var(--line);border-radius:9px;background:var(--panel)}
.native-metrics dt{font-size:12px;color:var(--muted)}
.native-metrics dd{margin:5px 0 0;line-height:1.4}
.native-metrics strong{display:block;color:var(--accent);font-size:34px;font-weight:650;letter-spacing:-1px;font-variant-numeric:tabular-nums}
.native-metrics dd>span{display:block;margin-top:8px;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.native-table{overflow-x:auto;max-width:100%;margin:24px 0;border:1px solid var(--line);border-radius:8px;scrollbar-width:thin;scrollbar-color:var(--line) transparent}
.native-table table{width:100%;min-width:520px;border-collapse:collapse;font-size:12px;font-variant-numeric:tabular-nums}
.native-table caption{padding:12px 15px;text-align:left;font-size:11px;color:var(--muted);background:var(--panel)}
.native-table th,.native-table td{padding:12px 15px;border-top:1px solid var(--line);text-align:right;white-space:nowrap}
.native-table th:first-child{text-align:left}
.native-table thead th{font-weight:600;background:var(--panel)}
.native-table tbody th{font-weight:400}
.native-table td:last-child,.native-table thead th:last-child{color:var(--accent);font-weight:600}
@media(max-width:560px){.backend-layers{grid-template-columns:1fr;gap:10px}.backend-layers>li{padding:15px 17px}.backend-layers>li:not(:last-child):after{display:none}.backend-layers p{margin-top:7px}.native-metrics{gap:10px}.native-metrics>div{padding:16px 14px}.native-metrics strong{font-size:29px}.native-metrics dd>span{font-size:11px}}