/* miBooks Help Centre. Same tokens and themes as the app (public/assets/css/app.css):
   light (default) · dark · contrast, or System via the device's settings. */

:root {
    --bg: #f8fafc; --surface: #ffffff; --surface-2: #f1f5f9; --border: #e2e8f0; --border-strong: #cbd5e1;
    --text: #0f172a; --text-2: #334155; --muted: #64748b; --faint: #94a3b8;
    --accent: #4f46e5; --accent-hover: #4338ca; --accent-fg: #fff; --accent-soft: #eef2ff; --accent-soft-2: #e0e7ff;
    --accent-text: #4338ca; --accent-border: #c7d2fe; --brand-1: #6366f1; --brand-2: #4338ca;
    --ring: 0 0 0 3px rgba(79, 70, 229, .28);
    --good: #047857; --good-soft: #ecfdf5; --good-border: #a7f3d0;
    --warn: #92400e; --warn-soft: #fffbeb; --warn-border: #fde68a;
    --danger: #be123c; --danger-soft: #fff1f2; --danger-border: #fecdd3;
    --mark: #e11d48;
    --hero-1: #eef2ff; --hero-2: #f5f3ff;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, .05);
    --shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 8px 24px -8px rgba(15, 23, 42, .1);
    --shadow-lg: 0 24px 48px -12px rgba(15, 23, 42, .25), 0 4px 12px rgba(15, 23, 42, .06);
    --bw: 1px;
    --radius: 12px; --radius-lg: 16px;
    --top-h: 64px; --side-w: 272px; --toc-w: 220px;
    --tap: 40px;
    color-scheme: light;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-feature-settings: "cv11", "ss01";
    -webkit-font-smoothing: antialiased;
}
:root[data-theme="dark"] {
    --bg: #0b1120; --surface: #111a2e; --surface-2: #1b263b; --border: #263247; --border-strong: #3b4a63;
    --text: #f8fafc; --text-2: #e2e8f0; --muted: #94a3b8; --faint: #64748b;
    --accent: #6366f1; --accent-hover: #818cf8; --accent-soft: rgba(129, 140, 248, .14); --accent-soft-2: rgba(129, 140, 248, .24);
    --accent-text: #a5b4fc; --accent-border: rgba(129, 140, 248, .45); --brand-1: #818cf8; --brand-2: #6366f1;
    --ring: 0 0 0 3px rgba(129, 140, 248, .4);
    --good: #34d399; --good-soft: rgba(16, 185, 129, .1); --good-border: rgba(16, 185, 129, .35);
    --warn: #fcd34d; --warn-soft: rgba(245, 158, 11, .1); --warn-border: rgba(245, 158, 11, .35);
    --danger: #fb7185; --danger-soft: rgba(244, 63, 94, .1); --danger-border: rgba(244, 63, 94, .35);
    --mark: #f43f5e;
    --hero-1: rgba(99, 102, 241, .16); --hero-2: rgba(139, 92, 246, .1);
    --shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 8px 24px -8px rgba(0, 0, 0, .5);
    color-scheme: dark;
}
:root[data-theme="contrast"] {
    --bg: #fff; --surface: #fff; --surface-2: #fff; --border: #000; --border-strong: #000;
    --text: #000; --text-2: #000; --muted: #000; --faint: #000;
    --accent: #0000c8; --accent-hover: #000080; --accent-soft: #fff; --accent-soft-2: #e8e8ff; --accent-text: #0000c8; --accent-border: #000;
    --brand-1: #000; --brand-2: #000; --ring: 0 0 0 3px #000;
    --good: #005a00; --good-soft: #fff; --good-border: #005a00;
    --warn: #000; --warn-soft: #ffff00; --warn-border: #000;
    --danger: #a00000; --danger-soft: #fff; --danger-border: #a00000;
    --mark: #c00000; --hero-1: #fff; --hero-2: #fff;
    --shadow-sm: none; --shadow: none; --shadow-lg: 0 0 0 2px #000;
    --bw: 2px;
}
@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
        --bg: #0b1120; --surface: #111a2e; --surface-2: #1b263b; --border: #263247; --border-strong: #3b4a63;
        --text: #f8fafc; --text-2: #e2e8f0; --muted: #94a3b8; --faint: #64748b;
        --accent: #6366f1; --accent-hover: #818cf8; --accent-soft: rgba(129, 140, 248, .14); --accent-soft-2: rgba(129, 140, 248, .24);
        --accent-text: #a5b4fc; --accent-border: rgba(129, 140, 248, .45); --brand-1: #818cf8; --brand-2: #6366f1;
        --ring: 0 0 0 3px rgba(129, 140, 248, .4);
        --good: #34d399; --good-soft: rgba(16, 185, 129, .1); --good-border: rgba(16, 185, 129, .35);
        --warn: #fcd34d; --warn-soft: rgba(245, 158, 11, .1); --warn-border: rgba(245, 158, 11, .35);
        --danger: #fb7185; --danger-soft: rgba(244, 63, 94, .1); --danger-border: rgba(244, 63, 94, .35);
        --mark: #f43f5e; --hero-1: rgba(99, 102, 241, .16); --hero-2: rgba(139, 92, 246, .1);
        --shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 8px 24px -8px rgba(0, 0, 0, .5);
        color-scheme: dark;
    }
}
@media (prefers-contrast: more) {
    :root:not([data-theme]) {
        --bg: #fff; --surface: #fff; --surface-2: #fff; --border: #000; --border-strong: #000;
        --text: #000; --text-2: #000; --muted: #000; --faint: #000;
        --accent: #0000c8; --accent-hover: #000080; --accent-soft: #fff; --accent-soft-2: #e8e8ff; --accent-text: #0000c8; --accent-border: #000;
        --brand-1: #000; --brand-2: #000; --ring: 0 0 0 3px #000;
        --good: #005a00; --good-soft: #fff; --good-border: #005a00; --warn: #000; --warn-soft: #ffff00; --warn-border: #000;
        --danger: #a00000; --danger-soft: #fff; --danger-border: #a00000; --mark: #c00000; --hero-1: #fff; --hero-2: #fff;
        --shadow-sm: none; --shadow: none; --bw: 2px; color-scheme: light;
    }
}
@media (pointer: coarse) { :root { --tap: 48px; } }

*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--top-h) + 20px); -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font-size: 16px; line-height: 1.6; }
a { color: var(--accent-text); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 100; background: var(--accent); color: var(--accent-fg); padding: 10px 14px; border-radius: 10px; }
.skip:focus { top: 12px; }
svg.i { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
kbd { font: 600 11px/1 "Inter", sans-serif; color: var(--muted); border: var(--bw) solid var(--border); border-bottom-width: 2px; border-radius: 6px; padding: 3px 6px; background: var(--surface); }

.icon-btn { display: inline-grid; place-items: center; width: var(--tap); height: var(--tap); border: 0; background: transparent; color: var(--text-2);
    border-radius: 10px; cursor: pointer; }
.icon-btn:hover { background: var(--surface-2); }

/* ---------------------------------------------------------------- top bar */
.topbar { position: sticky; top: 0; z-index: 30; height: var(--top-h); display: flex; align-items: center; gap: 16px;
    padding: 0 max(20px, env(safe-area-inset-right)) 0 max(20px, env(safe-area-inset-left));
    background: color-mix(in srgb, var(--surface) 86%, transparent); backdrop-filter: saturate(1.6) blur(14px); -webkit-backdrop-filter: saturate(1.6) blur(14px);
    border-bottom: var(--bw) solid var(--border); }
.menu-btn { display: none; margin-left: -8px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; width: calc(var(--side-w) - 36px); flex: none; }
.brand-mark { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 18px;
    background: linear-gradient(135deg, var(--brand-1), var(--brand-2)); box-shadow: 0 4px 12px -4px var(--brand-2); }
.brand-name { font-weight: 700; font-size: 17px; letter-spacing: -.01em; }
.brand-tag { font-size: 12px; font-weight: 600; color: var(--accent-text); background: var(--accent-soft); border: var(--bw) solid var(--accent-border);
    padding: 2px 8px; border-radius: 999px; }
.search { position: relative; flex: 1; max-width: 560px; }
.search-box { display: flex; align-items: center; gap: 10px; height: 42px; padding: 0 10px 0 14px; border-radius: 12px; color: var(--muted);
    background: var(--surface-2); border: var(--bw) solid transparent; transition: border-color .15s, box-shadow .15s, background .15s; cursor: text; }
.search-box:focus-within { background: var(--surface); border-color: var(--accent); box-shadow: var(--ring); }
.search-box input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--text); font: 500 16px/1 inherit; font-family: inherit; }
.search-box input::placeholder { color: var(--muted); }
.search-box input::-webkit-search-cancel-button { display: none; }
.search-results { position: absolute; top: calc(100% + 8px); left: 0; right: 0; max-height: min(70vh, 520px); overflow: auto; padding: 6px;
    background: var(--surface); border: var(--bw) solid var(--border); border-radius: 14px; box-shadow: var(--shadow-lg); }
.sr-item { display: block; padding: 10px 12px; border-radius: 10px; color: var(--text); text-decoration: none; }
.sr-item[aria-selected="true"], .sr-item:hover { background: var(--accent-soft); }
.sr-item .sr-where { display: block; font-size: 12px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.sr-item .sr-title { display: block; font-weight: 600; }
.sr-item .sr-text { display: block; font-size: 14px; color: var(--text-2); overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.sr-item mark { background: color-mix(in srgb, var(--accent) 22%, transparent); color: inherit; border-radius: 3px; padding: 0 1px; }
.sr-empty { padding: 18px 14px; color: var(--muted); font-size: 15px; }
.theme { margin-left: auto; display: flex; padding: 3px; gap: 2px; background: var(--surface-2); border: var(--bw) solid var(--border); border-radius: 12px; }
.theme button { width: 34px; height: 32px; display: grid; place-items: center; border: 0; border-radius: 9px; background: transparent; color: var(--muted); cursor: pointer; }
.theme button svg { width: 16px; height: 16px; }
.theme button[aria-pressed="true"] { background: var(--surface); color: var(--text); box-shadow: var(--shadow-sm); outline: var(--bw) solid var(--border); }

/* ----------------------------------------------------------------- layout */
.layout { display: grid; grid-template-columns: var(--side-w) minmax(0, 1fr) var(--toc-w); gap: 0 48px; max-width: 1440px; margin: 0 auto;
    padding: 0 max(24px, env(safe-area-inset-right)) 0 max(24px, env(safe-area-inset-left)); }
.layout.no-toc { grid-template-columns: var(--side-w) minmax(0, 1fr); }
.layout.no-toc .content { max-width: 1080px; }
.sidebar { position: sticky; top: var(--top-h); align-self: start; height: calc(100vh - var(--top-h)); overflow: auto; padding: 24px 8px 40px 0;
    border-right: var(--bw) solid var(--border); scrollbar-width: thin; }
.sidebar-head { display: none; }
.nav-home { display: block; padding: 8px 12px; margin: 0 8px 14px 0; border-radius: 10px; font-weight: 600; color: var(--text-2); text-decoration: none; }
.nav-home:hover { background: var(--surface-2); }
.nav-home.active { background: var(--accent-soft); color: var(--accent-text); }
.nav-group { margin-bottom: 20px; }
.nav-title { display: flex; align-items: center; gap: 8px; padding: 0 12px 6px; font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.nav-title svg { width: 15px; height: 15px; }
.nav-group ul { list-style: none; margin: 0; padding: 0 16px 0 0; }
.nav-group a { display: block; padding: 7px 12px; border-radius: 9px; color: var(--text-2); text-decoration: none; font-size: 15px; line-height: 1.35; position: relative; }
.nav-group a:hover { background: var(--surface-2); color: var(--text); }
.nav-group a.active { background: var(--accent-soft); color: var(--accent-text); font-weight: 600; }
.nav-group a.active::before { content: ""; position: absolute; left: -9px; top: 8px; bottom: 8px; width: 3px; border-radius: 3px; background: var(--accent); }
.scrim { display: none; }

.content { min-width: 0; padding: 40px 0 64px; outline: 0; }
.toc { position: sticky; top: calc(var(--top-h) + 40px); align-self: start; padding-top: 40px; font-size: 14px; }
.toc-title { font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.toc ul { list-style: none; margin: 0; padding: 0; border-left: var(--bw) solid var(--border); }
.toc a { display: block; padding: 5px 0 5px 14px; margin-left: -1px; border-left: 2px solid transparent; color: var(--muted); text-decoration: none; line-height: 1.4; }
.toc a:hover { color: var(--text); }
.toc a.active { color: var(--accent-text); border-left-color: var(--accent); font-weight: 600; }

/* ---------------------------------------------------------------- article */
.article { max-width: 760px; }
.crumbs { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 14px; color: var(--muted); margin-bottom: 14px; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--text); }
.crumbs span { display: inline-flex; align-items: center; gap: 6px; }
.crumbs svg { width: 15px; height: 15px; }
h1 { font-size: clamp(30px, 4.2vw, 40px); line-height: 1.12; letter-spacing: -.025em; font-weight: 800; margin: 0 0 12px; text-wrap: balance; }
.lede { font-size: 19px; line-height: 1.55; color: var(--text-2); margin: 0 0 18px; text-wrap: pretty; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 32px; padding-bottom: 28px; border-bottom: var(--bw) solid var(--border); }
.chip { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600; padding: 5px 11px; border-radius: 999px;
    background: var(--accent-soft); color: var(--accent-text); border: var(--bw) solid var(--accent-border); }
.chip.quiet { background: var(--surface); color: var(--muted); border-color: var(--border); font-weight: 500; }
.chip svg { width: 14px; height: 14px; }

.prose { color: var(--text-2); font-size: 16.5px; }
.prose > :first-child { margin-top: 0; }
.prose p { margin: 0 0 16px; }
.prose h2 { font-size: 24px; letter-spacing: -.015em; line-height: 1.25; color: var(--text); margin: 48px 0 14px; position: relative; }
.prose h3 { font-size: 18px; color: var(--text); margin: 30px 0 10px; position: relative; }
.anchor { position: absolute; left: -24px; color: var(--faint); text-decoration: none; opacity: 0; font-weight: 500; }
h2:hover .anchor, h3:hover .anchor { opacity: 1; }
.prose strong { color: var(--text); font-weight: 650; }
.prose code { font: 500 .88em ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--surface-2); border: var(--bw) solid var(--border); padding: 1px 6px; border-radius: 6px; }
.prose ul { padding-left: 22px; margin: 0 0 18px; }
.prose ul li { margin: 6px 0; }
.prose ul li::marker { color: var(--accent); }
svg.ext { width: 13px; height: 13px; margin-left: 2px; vertical-align: -1px; fill: none; stroke: currentColor; stroke-width: 2.2; }

/* numbered marker that matches the red dots on screenshots */
.mk { display: inline-grid; place-items: center; min-width: 22px; height: 22px; padding: 0 5px; border-radius: 999px; background: var(--mark); color: #fff;
    font: 700 12px/1 "Inter", sans-serif; vertical-align: 2px; margin: 0 2px; box-shadow: 0 0 0 2px var(--surface); }

/* steps */
ol.steps { list-style: none; margin: 8px 0 24px; padding: 0; counter-reset: s; position: relative; }
ol.steps > li { display: grid; grid-template-columns: 36px minmax(0, 1fr); gap: 16px; position: relative; padding-bottom: 18px; }
ol.steps > li:not(:last-child)::before { content: ""; position: absolute; left: 17px; top: 38px; bottom: 2px; width: 2px; background: var(--border); border-radius: 2px; }
.step-n { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; font-weight: 700; font-size: 15px;
    background: var(--surface); color: var(--accent-text); border: 2px solid var(--accent-border); box-shadow: var(--shadow-sm); position: relative; z-index: 1; }
.step-body { padding-top: 5px; min-width: 0; }
.step-body > p:first-child { color: var(--text); }
.step-body p { margin: 0 0 8px; }
.step-body ul { margin-bottom: 8px; }
.step-body .shot { margin: 14px 0 8px; }
.step-body .callout { margin: 12px 0 6px; }

/* screenshots */
.shot { margin: 28px 0; }
.shot-frame { display: block; border-radius: 14px; overflow: hidden; border: var(--bw) solid var(--border); background: var(--surface);
    box-shadow: var(--shadow); cursor: zoom-in; transition: transform .2s, box-shadow .2s; }
.shot-frame:hover { box-shadow: var(--shadow-lg); }
.shot img { display: block; width: 100%; height: auto; }
.shot figcaption { margin-top: 10px; font-size: 14px; color: var(--muted); text-align: center; text-wrap: balance; }
.shot.phone { max-width: 300px; margin-left: auto; margin-right: auto; }
.shot.phone .shot-frame { border-radius: 34px; border: 8px solid #0f172a; box-shadow: var(--shadow-lg); }
:root[data-theme="dark"] .shot.phone .shot-frame { border-color: #334155; }
.shots-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; }

/* callouts */
.callout { margin: 24px 0; padding: 16px 18px; border-radius: 14px; border: var(--bw) solid var(--accent-border); background: var(--accent-soft); color: var(--text-2); }
.callout-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 6px; color: var(--accent-text); }
.callout-kind { font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }
.callout-head strong { color: var(--text); font-size: 16px; flex-basis: 100%; }
.callout p:last-child, .callout ul:last-child { margin-bottom: 0; }
.callout.good { background: var(--good-soft); border-color: var(--good-border); }
.callout.good .callout-head { color: var(--good); }
.callout.trouble, .callout.warn { background: var(--warn-soft); border-color: var(--warn-border); }
.callout.trouble .callout-head, .callout.warn .callout-head { color: var(--warn); }
.callout.admin { background: var(--surface); border-color: var(--border-strong); border-left: 4px solid var(--accent); }

/* tables */
.table-wrap { overflow-x: auto; margin: 20px 0 24px; border: var(--bw) solid var(--border); border-radius: 14px; background: var(--surface); }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 11px 14px; border-bottom: var(--bw) solid var(--border); vertical-align: top; }
th { font-size: 13px; font-weight: 700; color: var(--muted); background: var(--surface-2); letter-spacing: .02em; }
tr:last-child td { border-bottom: 0; }

/* prev / next */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 56px; padding-top: 28px; border-top: var(--bw) solid var(--border); }
.pg { display: flex; flex-direction: column; gap: 4px; padding: 16px 18px; border-radius: 14px; border: var(--bw) solid var(--border); background: var(--surface);
    text-decoration: none; color: var(--text); transition: border-color .15s, box-shadow .15s, transform .15s; }
.pg:hover { border-color: var(--accent-border); box-shadow: var(--shadow); transform: translateY(-1px); }
.pg span { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); font-weight: 600; }
.pg span svg { width: 15px; height: 15px; }
.pg.next { text-align: right; align-items: flex-end; }
.pg strong { font-size: 16px; color: var(--accent-text); }

/* ------------------------------------------------------------------- home */
.hero { position: relative; padding: 56px 48px; margin: 0 0 36px; border-radius: 24px; overflow: hidden; border: var(--bw) solid var(--border);
    background: radial-gradient(1200px 400px at 0% 0%, var(--hero-1), transparent 60%), radial-gradient(900px 400px at 100% 100%, var(--hero-2), transparent 60%), var(--surface); }
.hero::after { content: ""; position: absolute; right: -60px; top: -60px; width: 260px; height: 260px; border-radius: 50%;
    background: linear-gradient(135deg, var(--brand-1), var(--brand-2)); opacity: .08; }
.eyebrow { margin: 0 0 10px; font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent-text); }
.hero h1 { font-size: clamp(32px, 5vw, 48px); max-width: 16ch; }
.hero .lede { max-width: 56ch; }
.hero-search { display: flex; align-items: center; gap: 12px; width: 100%; max-width: 560px; height: 56px; padding: 0 14px 0 18px; margin-top: 8px;
    border-radius: 14px; border: var(--bw) solid var(--border-strong); background: var(--surface); color: var(--muted); font: 500 16px/1 inherit; font-family: inherit;
    cursor: text; box-shadow: var(--shadow); text-align: left; position: relative; z-index: 1; }
.hero-search span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hero-search:hover { border-color: var(--accent); }
.cats { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.cat { padding: 24px; border-radius: 18px; border: var(--bw) solid var(--border); background: var(--surface); box-shadow: var(--shadow-sm); }
.cat-icon { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; color: var(--accent-text); background: var(--accent-soft);
    border: var(--bw) solid var(--accent-border); margin-bottom: 14px; }
.cat-icon svg { width: 22px; height: 22px; }
.cat h2 { font-size: 19px; margin: 0 0 6px; letter-spacing: -.01em; }
.cat p { margin: 0 0 14px; color: var(--muted); font-size: 15px; }
.cat ul { list-style: none; margin: 0; padding: 0; border-top: var(--bw) solid var(--border); }
.cat li a { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 11px 2px; border-bottom: var(--bw) solid var(--border);
    color: var(--text); text-decoration: none; font-weight: 500; font-size: 15px; }
.cat li:last-child a { border-bottom: 0; padding-bottom: 0; }
.cat li a svg { width: 16px; height: 16px; color: var(--faint); transition: transform .15s, color .15s; }
.cat li a:hover { color: var(--accent-text); }
.cat li a:hover svg { transform: translateX(3px); color: var(--accent); }
.home-prose { max-width: 760px; margin-top: 40px; }

/* ------------------------------------------------------------- zoom, etc. */
.zoom { border: 0; padding: 0; background: transparent; max-width: 96vw; max-height: 94vh; overflow: visible; }
.zoom::backdrop { background: rgba(2, 6, 23, .82); backdrop-filter: blur(4px); }
.zoom img { display: block; max-width: 96vw; max-height: 92vh; border-radius: 12px; box-shadow: var(--shadow-lg); }
.zoom .icon-btn { position: fixed; top: 16px; right: 16px; background: rgba(15, 23, 42, .7); color: #fff; }
.footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; max-width: 1440px; margin: 0 auto;
    padding: 28px max(24px, env(safe-area-inset-right)) calc(28px + env(safe-area-inset-bottom)) max(24px, env(safe-area-inset-left));
    border-top: var(--bw) solid var(--border); color: var(--muted); font-size: 14px; }
.footer a { color: var(--muted); }

/* ------------------------------------------------------------- responsive */
@media (max-width: 1180px) {
    .layout { grid-template-columns: var(--side-w) minmax(0, 1fr); }
    .toc { display: none; }
}
@media (max-width: 900px) {
    :root { --top-h: 60px; }
    .layout { display: block; padding: 0 16px; }
    .menu-btn { display: inline-grid; }
    .brand { width: auto; }
    .brand-name { display: none; }
    .topbar { gap: 10px; padding: 0 12px; }
    .theme { display: none; }
    .sidebar { position: fixed; z-index: 50; top: 0; left: 0; bottom: 0; height: auto; width: min(86vw, 320px); padding: 0 12px 32px 16px;
        padding-top: env(safe-area-inset-top); background: var(--surface); border-right: var(--bw) solid var(--border); box-shadow: var(--shadow-lg);
        transform: translateX(-104%); transition: transform .25s cubic-bezier(.2, .8, .2, 1); visibility: hidden; }
    .sidebar.open { transform: none; visibility: visible; }
    .sidebar-head { display: flex; align-items: center; justify-content: space-between; height: 60px; margin-bottom: 8px; font-weight: 700; }
    .sidebar .theme-mobile { display: flex; }
    .scrim { display: block; position: fixed; inset: 0; z-index: 40; background: rgba(15, 23, 42, .4); }
    .scrim[hidden] { display: none; }
    .nav-group a { padding: 11px 12px; }
    .content { padding: 28px 0 48px; }
    .hero { padding: 36px 22px; border-radius: 20px; }
    .prose h2 { margin-top: 40px; }
    .anchor { display: none; }
    .lede { font-size: 17.5px; }
    .search-box kbd, .hero-search kbd { display: none; }
    .search-results { position: fixed; top: calc(var(--top-h) + 6px); left: 10px; right: 10px; }
    .pager { grid-template-columns: 1fr; }
    .pg.next { text-align: left; align-items: flex-start; }
    ol.steps > li { grid-template-columns: 30px minmax(0, 1fr); gap: 12px; }
    .step-n { width: 30px; height: 30px; font-size: 14px; }
    ol.steps > li:not(:last-child)::before { left: 14px; top: 32px; }
}
.theme-mobile { display: none; margin: 4px 0 18px; justify-content: space-between; }
.theme-mobile button { flex: 1; }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; } }
@media print {
    .topbar, .sidebar, .toc, .pager, .footer, .scrim { display: none !important; }
    .layout { display: block; }
    .shot-frame { box-shadow: none; }
}
:root[data-theme="dark"] .shot-frame img { filter: brightness(.92); }
@media (prefers-color-scheme: dark) { :root:not([data-theme]) .shot-frame img { filter: brightness(.92); } }
.shot.narrow { max-width: 520px; margin-left: auto; margin-right: auto; }
.step-body .shot.narrow { margin-left: 0; }