/* IT Wonder Lab theme: light and dark, no inline styles (see the Content-Security-Policy in src/worker.js) */
:root{
  --bg:#fafbfc;--surface:#fff;--fg:#1a2030;--muted:#5d6779;--line:#e4e8ef;
  --accent:#d51253;--accent-fg:#fff;--link:#b50f45;--chip-bg:#fdeaf1;--chip-fg:#a30d3d;
  --code-bg:#f4f6fa;--code-fg:#1f2430;--inline-code:#eef1f6;
  --tok-kw:#cf222e;--tok-str:#0a3069;--tok-com:#6e7781;--tok-num:#0550ae;--tok-attr:#116329;--tok-fn:#953800;--tok-sub:#8250df;
  --img-bg:#fff;--shadow:0 1px 2px rgba(20,30,50,.06),0 4px 16px rgba(20,30,50,.06);
  --note-bg:#eef4ff;--note-line:#3b82f6;--warn-bg:#fff4e5;--warn-line:#f59e0b;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){
  --bg:#0d111a;--surface:#151b28;--fg:#e7ebf3;--muted:#9aa5b8;--line:#263044;
  --accent:#ff4a86;--accent-fg:#1a0610;--link:#ff7aa6;--chip-bg:#35142a;--chip-fg:#ff9bbc;
  --code-bg:#090c13;--code-fg:#e6eaf2;--inline-code:#1d2536;
  --tok-kw:#ff7b72;--tok-str:#a5d6ff;--tok-com:#8b949e;--tok-num:#79c0ff;--tok-attr:#7ee787;--tok-fn:#ffa657;--tok-sub:#d2a8ff;
  --img-bg:#f6f7fa;--shadow:0 1px 2px rgba(0,0,0,.4),0 6px 20px rgba(0,0,0,.35);
  --note-bg:#14213d;--note-line:#4f8df7;--warn-bg:#33240b;--warn-line:#e0a030;
  color-scheme:dark}}
:root[data-theme=dark]{
  --bg:#0d111a;--surface:#151b28;--fg:#e7ebf3;--muted:#9aa5b8;--line:#263044;
  --accent:#ff4a86;--accent-fg:#1a0610;--link:#ff7aa6;--chip-bg:#35142a;--chip-fg:#ff9bbc;
  --code-bg:#090c13;--code-fg:#e6eaf2;--inline-code:#1d2536;
  --tok-kw:#ff7b72;--tok-str:#a5d6ff;--tok-com:#8b949e;--tok-num:#79c0ff;--tok-attr:#7ee787;--tok-fn:#ffa657;--tok-sub:#d2a8ff;
  --img-bg:#f6f7fa;--shadow:0 1px 2px rgba(0,0,0,.4),0 6px 20px rgba(0,0,0,.35);
  --note-bg:#14213d;--note-line:#4f8df7;--warn-bg:#33240b;--warn-line:#e0a030;
  color-scheme:dark}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.7 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--link);text-underline-offset:3px}
a:hover{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
.skip-link{position:absolute;left:-999px;top:8px;z-index:20;background:var(--accent);color:var(--accent-fg);padding:8px 14px;border-radius:8px}
.skip-link:focus{left:8px}

/* header */
.site-header{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bar{max-width:1080px;margin:0 auto;padding:12px 16px;display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px}
.brand{display:inline-flex;color:var(--fg);line-height:0}
.logo{height:22px;width:auto;display:block}
.site-header nav{display:flex;flex-wrap:wrap;gap:4px 6px;flex:1;font-size:.93rem}
.site-header nav a{color:var(--muted);text-decoration:none;padding:4px 10px;border-radius:999px}
.site-header nav a:hover{color:var(--fg);background:var(--chip-bg)}
.site-header nav a[aria-current=page]{color:var(--chip-fg);background:var(--chip-bg);font-weight:600}
.theme-toggle{margin-left:0;background:none;border:1px solid var(--line);color:var(--fg);width:38px;height:38px;border-radius:50%;display:grid;place-items:center;cursor:pointer}
.search-link{margin-left:auto;width:38px;height:38px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;color:var(--fg)}
.search-link:hover{border-color:var(--accent);color:var(--accent)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.search-form{display:flex;gap:10px;margin:1rem 0}
.search-form input{flex:1;min-width:0;font:inherit;padding:10px 16px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--fg)}
.search-form input:focus{outline:2px solid var(--accent);outline-offset:1px}
.search-form .button{cursor:pointer;font:inherit;font-weight:600}
.search-status{color:var(--muted)}
.search-results{list-style:none;padding:0;margin:1rem 0;display:grid;gap:14px}
.search-results li{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 20px}
.search-results h2{margin:0 0 .3rem;font-size:1.1rem}
.search-results p{margin:0;color:var(--muted);font-size:.95rem;line-height:1.55}
.search-results mark{background:color-mix(in srgb,var(--accent) 25%,transparent);color:inherit;border-radius:3px;padding:0 2px}
.search-more{cursor:pointer;font:inherit;font-weight:600}
.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}
.i-sun{display:none}
:root[data-theme=dark] .i-sun{display:block}:root[data-theme=dark] .i-moon{display:none}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .i-sun{display:block}:root:not([data-theme=light]) .i-moon{display:none}}

/* layout */
.wrap{max-width:1080px;margin:0 auto;padding:0 16px 48px}
.prose{max-width:760px;margin:0 auto}
h1{font-size:clamp(1.8rem,4.5vw,2.6rem);line-height:1.15;letter-spacing:-.02em;margin:1.2rem 0 .6rem}
h2{font-size:1.55rem;line-height:1.25;margin:2.6rem 0 .6rem;letter-spacing:-.01em}
h3{font-size:1.2rem;line-height:1.3;margin:2rem 0 .5rem}
h4{margin:1.6rem 0 .4rem}
.meta,time{color:var(--muted);font-size:.88rem}
.anchor{margin-left:.35em;font-weight:400;text-decoration:none;opacity:0;color:var(--muted)}
:is(h2,h3,h4):hover .anchor,.anchor:focus{opacity:1}
.breadcrumb{font-size:.85rem;margin-top:1.2rem}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:2px 0;margin:0;padding:0;color:var(--muted)}
.breadcrumb li+li::before{content:"›";margin:0 .5em;color:var(--muted)}
.breadcrumb a{color:var(--muted)}
.tags{margin-top:2.5rem;padding-top:1rem;border-top:1px solid var(--line)}
.tags a{display:inline-block;margin:0 8px 6px 0;font-size:.88rem;color:var(--muted)}

/* hero + featured series */
.hero{padding:3rem 0 1.5rem}
.hero h1{margin-top:.3rem;max-width:18ch}
.eyebrow{color:var(--accent);font-weight:700;font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;margin:0}
.lead{font-size:1.2rem;color:var(--muted);max-width:60ch}
.topics{display:flex;flex-wrap:wrap;gap:10px;margin-top:1.4rem}
.topic,.button{display:inline-block;text-decoration:none;font-weight:600;padding:9px 18px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--fg)}
.topic:hover{border-color:var(--accent);color:var(--accent)}
.button{background:var(--accent);border-color:var(--accent);color:var(--accent-fg)}
.button:hover{filter:brightness(1.08);color:var(--accent-fg)}
.featured{display:grid;grid-template-columns:1.3fr 1fr;gap:28px;margin:2rem 0;padding:26px 28px;background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}
.featured h2{margin:.2rem 0 .4rem}
.featured ol{margin:0;padding-left:1.4rem;align-self:center}
@media (max-width:760px){.featured{grid-template-columns:1fr}}
.section-title{margin-top:2.4rem}.more{text-align:center;margin-top:2rem}
.prose-wide{max-width:1080px}

/* cards */
.cards{list-style:none;padding:0;margin:1rem 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;transition:transform .15s,box-shadow .15s,border-color .15s}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:var(--accent)}
.card-link{display:flex;flex-direction:column;height:100%;padding:18px 20px;color:inherit;text-decoration:none}
.card h2,.card h3{margin:.6rem 0 .4rem;font-size:1.08rem;line-height:1.35;color:var(--fg)}
.card p{margin:0 0 .8rem;color:var(--muted);font-size:.93rem;line-height:1.55;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{margin-top:auto;color:var(--muted);font-size:.85rem}
.chip{align-self:flex-start;background:var(--chip-bg);color:var(--chip-fg);font-size:.75rem;font-weight:700;letter-spacing:.03em;padding:3px 10px;border-radius:999px}
.related{margin-top:3rem}.related h2{margin-top:0}

/* article content */
.content{overflow-wrap:break-word}
.content p,.content li{margin:.9rem 0}
.content li>p{margin:.4rem 0}
.content ul,.content ol{padding-left:1.4rem}
/* Screenshots and diagrams are drawn for light backgrounds: keep them on a light card in dark mode */
.content img,.content svg.diagram{max-width:100%;height:auto;background:var(--img-bg);border:1px solid var(--line);border-radius:10px;padding:6px;box-shadow:var(--shadow)}
.content figure{margin:1.8rem 0;text-align:center}
.content figure.code{text-align:left}
.content figcaption{color:var(--muted);font-size:.85rem;margin-top:.5rem}
.content figure.code figcaption{margin:0;padding:6px 14px;background:var(--inline-code);border:1px solid var(--line);border-bottom:0;border-radius:12px 12px 0 0;font:600 12.5px ui-monospace,SFMono-Regular,Menlo,monospace}
.content figure.code pre{margin-top:0;border-top-left-radius:0;border-top-right-radius:0}
.content a img{transition:filter .15s}.content a:hover img{filter:brightness(.97)}
pre,code{font:14px/1.6 ui-monospace,SFMono-Regular,"JetBrains Mono",Menlo,Consolas,monospace}
code{background:var(--inline-code);padding:.12em .4em;border-radius:5px;font-size:.9em}
pre{position:relative;background:var(--code-bg);color:var(--code-fg);padding:16px 18px;border-radius:12px;overflow-x:auto;border:1px solid var(--line);margin:1.4rem 0;tab-size:2}
pre code{background:none;padding:0;color:inherit;font-size:inherit}
.copy{position:absolute;top:8px;right:8px;font:600 12px system-ui,sans-serif;padding:3px 10px;border-radius:6px;border:1px solid var(--line);background:var(--surface);color:var(--muted);cursor:pointer;opacity:0;transition:opacity .15s}
pre:hover .copy,.copy:focus{opacity:1}
@media (hover:none){.copy{opacity:1}}
.hljs-keyword,.hljs-literal,.hljs-selector-tag,.hljs-name{color:var(--tok-kw)}
.hljs-string,.hljs-regexp,.hljs-addition{color:var(--tok-str)}
.hljs-comment,.hljs-quote{color:var(--tok-com);font-style:italic}
.hljs-number,.hljs-symbol,.hljs-bullet{color:var(--tok-num)}
.hljs-attr,.hljs-attribute,.hljs-variable,.hljs-property{color:var(--tok-attr)}
.hljs-built_in,.hljs-type,.hljs-title,.hljs-section,.hljs-meta{color:var(--tok-fn)}
.hljs-subst,.hljs-template-variable{color:var(--tok-sub)}
.hljs-deletion{color:var(--tok-kw)}
.table-wrap{overflow-x:auto;margin:1.4rem 0}
table{border-collapse:collapse;width:100%}
td,th{border:1px solid var(--line);padding:8px 12px;text-align:left;vertical-align:top}th{background:var(--surface)}
tbody tr:nth-child(even){background:color-mix(in srgb,var(--surface) 60%,transparent)}
blockquote{margin:1.4rem 0;padding:.2rem 1.1rem;border-left:4px solid var(--accent);background:var(--surface);border-radius:0 8px 8px 0;color:var(--muted)}
.note{margin:1.5rem 0;padding:.4rem 1.1rem;background:var(--note-bg);border-left:4px solid var(--note-line);border-radius:0 10px 10px 0}
.note-warning,.note-caution{background:var(--warn-bg);border-left-color:var(--warn-line)}
.note-title{font-weight:700;margin:.5rem 0 0!important;font-size:.85rem;letter-spacing:.06em;text-transform:uppercase}
.note p{margin:.4rem 0}
hr{border:0;border-top:1px solid var(--line);margin:2.5rem 0}
mark{background:color-mix(in srgb,var(--accent) 22%,transparent);color:inherit;padding:0 .2em;border-radius:3px}
.asciicast{margin:1.6rem 0;min-height:120px}

/* table of contents */
.toc{margin:1.8rem 0;padding:14px 20px;background:var(--surface);border:1px solid var(--line);border-radius:12px}
.toc summary{cursor:pointer;font-weight:700}
.toc ol{list-style:none;margin:.6rem 0 0;padding:0;font-size:.95rem}
.toc li{margin:.25rem 0}.toc .l1{padding-left:1.1rem}

/* tutorial series navigation */
.series{margin:2.5rem 0 0;padding:18px 22px;background:var(--surface);border:1px solid var(--line);border-radius:14px}
.series h2{margin:0 0 .6rem;font-size:1.05rem}
.series ol{columns:2 260px;column-gap:28px;margin:0;padding-left:1.5rem}
.series li{margin:.15rem 0;break-inside:avoid}
.series strong{color:var(--accent)}
.series-pager{display:flex;justify-content:space-between;gap:12px;margin:1rem 0 0;font-weight:600}

/* author box */
.author{display:flex;gap:16px;align-items:center;margin:2.5rem 0 0;padding:16px 20px;background:var(--surface);border:1px solid var(--line);border-radius:14px}
.author img{border-radius:50%;object-fit:cover;flex:none}
.author p{margin:.1rem 0;font-size:.93rem}

/* about page */
.about-head{display:flex;flex-wrap:wrap;gap:24px;align-items:center;margin:1.5rem 0}
.about-head img{border-radius:50%;object-fit:cover;box-shadow:var(--shadow);padding:0;border:0;background:none}
.about-head>div{flex:1 1 300px}

/* footer */
.site-footer{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}
.site-footer .bar{justify-content:space-between;padding-top:22px;padding-bottom:22px;gap:10px 28px}
.site-footer nav{display:flex;flex-wrap:wrap;gap:6px 18px}
.site-footer a{color:var(--muted)}
.ai-note{text-decoration:none;font-weight:600}.ai-note span{color:var(--accent)}.site-footer a:hover{color:var(--accent)}
@media (max-width:640px){body{font-size:16px}.hero{padding-top:1.5rem}.cards{grid-template-columns:1fr}.author{align-items:flex-start}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.site-header,.site-footer,.theme-toggle,.copy,.series,.related,.author,.toc,.skip-link{display:none!important}body{background:#fff;color:#000}a{color:#000}.content img{box-shadow:none}pre{white-space:pre-wrap;border:1px solid #ccc}}

/* clickable SVG diagrams */
svg.diagram{display:inline-block;max-width:100%;height:auto}
svg.diagram a{cursor:pointer}
svg.diagram a:hover{opacity:.88}
svg.diagram a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* glossary: tutorials that use a service */
.used-in{margin:2.5rem 0 0;padding:16px 22px;background:var(--surface);border:1px solid var(--line);border-radius:14px}
.used-in h2{margin:0 0 .5rem;font-size:1.05rem}
.used-in ul{margin:0;padding-left:1.3rem}.used-in li{margin:.25rem 0}

/* 404 */
.notfound{max-width:760px;margin:0 auto;padding-top:2rem}
.nf-code{font-size:clamp(5rem,22vw,9rem);font-weight:800;line-height:1;margin:0;letter-spacing:-.04em;background:linear-gradient(120deg,var(--accent),#7b42bc);-webkit-background-clip:text;background-clip:text;color:transparent}
.nf-term{margin:1.5rem 0}
.t-prompt{color:var(--tok-attr)}.t-dim{color:var(--tok-com)}.t-del{color:var(--tok-kw)}.t-add{color:var(--tok-attr)}
.nf-suggest{margin:1.2rem 0;padding:14px 20px;background:var(--note-bg);border-left:4px solid var(--note-line);border-radius:0 10px 10px 0}
.nf-suggest p{margin:0 0 .4rem;font-weight:700}.nf-suggest ul{margin:0;padding-left:1.2rem}
.nf-actions{margin:1.6rem 0}
.notfound .cards{margin-top:.5rem}

/* phones: compact header (logo + toggle, nav on one swipeable row) */
@media (max-width:640px){
  .bar{padding:8px 16px;gap:6px 12px}
  .brand{order:1}
  .search-link{order:2;margin-left:auto;width:34px;height:34px}
  .theme-toggle{order:2;margin-left:0;width:34px;height:34px}
  .site-header nav{order:3;flex:0 0 100%;flex-wrap:nowrap;overflow-x:auto;gap:2px;margin:0 -16px;padding:0 16px 2px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
  .site-header nav::-webkit-scrollbar{display:none}
  .site-header nav a{white-space:nowrap;flex:none}
  .site-footer .bar{flex-direction:column;align-items:flex-start}
  .featured{padding:20px}
  h2{font-size:1.35rem;margin-top:2rem}
  pre{padding:14px;margin-left:-4px;margin-right:-4px;font-size:13px}
}

/* cookie consent banner */
.consent{position:fixed;left:12px;right:12px;bottom:12px;z-index:30;max-width:720px;margin:0 auto;padding:16px 18px;background:var(--surface);color:var(--fg);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow),0 8px 32px rgba(0,0,0,.18);display:flex;flex-wrap:wrap;gap:12px 18px;align-items:center;font-size:.92rem}
.consent[hidden]{display:none}
.consent p{margin:0;flex:1 1 300px;line-height:1.5}
.consent-actions{display:flex;gap:10px;flex:none}
.consent .button{cursor:pointer;font:inherit;font-weight:600;padding:8px 20px}
.consent .consent-no{background:var(--surface);color:var(--fg);border-color:var(--fg)}
.consent .consent-no:hover{color:var(--accent);border-color:var(--accent)}
@media print{.consent{display:none!important}}
.topic[aria-pressed=true]{background:var(--chip-bg);color:var(--chip-fg);border-color:var(--accent)}
.browse button.topic{cursor:pointer;font:inherit;font-weight:600}
.search-page .browse{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:.5rem 0}
.search-page .browse .topic{padding:3px 12px;font-size:.85rem}