/* Mojoo Office - product website
   Layout concept: an operations console. Each page is a stack of full-width bands; inside them a 12-column grid,
   hairline rules and a product "console" mock that shows real screens (repairs, invoices, VAT boxes). */
:root {
  --paper: #f5f7fa;        /* page ground: cool, faintly blue */
  --surface: #ffffff;      /* cards, console */
  --sunk: #eef2f7;         /* inset areas, table heads */
  --ink: #0f1b2d;          /* headings and body */
  --ink-2: #46526b;        /* secondary text */
  --line: #dde3ec;         /* hairlines */
  --accent: #145da0;       /* Mojoo blue - links, buttons, key marks */
  --accent-ink: #0c3e6d;   /* accent hover / on-tint text */
  --tint: #e6eff9;         /* accent wash */
  --signal: #b3175a;       /* Mojoo magenta - used once per screen at most */
  --ok: #1d7a4c; --warn: #9a5b00; --bad: #b3261e;
  --band-dark: #0f1b2d; --band-dark-ink: #e9eef6; --band-dark-2: #a9b6cc; --band-dark-line: #24324c;
  --font-display: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  --step--1: 0.8125rem; --step-0: 1rem; --step-1: 1.125rem; --step-2: 1.375rem; --step-3: 1.75rem; --step-4: 2.375rem; --step-5: clamp(2.25rem, 4.6vw, 3.5rem);
  --radius: 6px; --wrap: 1180px;
  --shadow: 0 1px 2px rgba(15, 27, 45, .06), 0 8px 24px rgba(15, 27, 45, .06);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0b1220; --surface: #111a2b; --sunk: #0e1626; --ink: #e8edf5; --ink-2: #a5b1c6; --line: #24314a;
    --accent: #5ea5ea; --accent-ink: #a7cdf3; --tint: #13253f; --signal: #f0679b;
    --ok: #4cc38a; --warn: #e3a64a; --bad: #f2867f;
    --band-dark: #060b15; --band-dark-ink: #e8edf5; --band-dark-2: #a5b1c6; --band-dark-line: #1d2940;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0b1220; --surface: #111a2b; --sunk: #0e1626; --ink: #e8edf5; --ink-2: #a5b1c6; --line: #24314a;
  --accent: #5ea5ea; --accent-ink: #a7cdf3; --tint: #13253f; --signal: #f0679b;
  --ok: #4cc38a; --warn: #e3a64a; --bad: #f2867f;
  --band-dark: #060b15; --band-dark-ink: #e8edf5; --band-dark-2: #a5b1c6; --band-dark-line: #1d2940;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font-body); font-size: var(--step-0); line-height: 1.6; }
img { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { color: var(--accent-ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.15; margin: 0; text-wrap: balance; letter-spacing: -0.015em; }
h1 { font-size: var(--step-5); font-weight: 600; letter-spacing: -0.025em; }
h2 { font-size: var(--step-4); font-weight: 600; }
h3 { font-size: var(--step-2); font-weight: 600; }
h4 { font-size: var(--step-1); font-weight: 600; }
p { margin: 0; }
.mono, code, kbd { font-family: var(--font-mono); font-size: .92em; }
.num { font-variant-numeric: tabular-nums; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.measure { max-width: 64ch; }
.muted { color: var(--ink-2); }
.eyebrow { font-family: var(--font-mono); font-size: var(--step--1); text-transform: uppercase; letter-spacing: .08em; color: var(--accent); font-weight: 500; }
.lead { font-size: var(--step-1); color: var(--ink-2); max-width: 60ch; }
.stack { display: flex; flex-direction: column; gap: 1rem; }
.stack-lg { display: flex; flex-direction: column; gap: 1.75rem; }
.row { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }

/* preview ribbon - remove when the site goes live */
.ribbon { background: var(--sunk); border-bottom: 1px solid var(--line); font-size: var(--step--1); color: var(--ink-2); }
.ribbon .wrap { padding-block: 6px; display: flex; gap: .5rem; flex-wrap: wrap; }
.ribbon b { color: var(--signal); font-weight: 600; }

/* header */
.site-head { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: saturate(1.4) blur(8px); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; gap: 1.5rem; min-height: 64px; padding-block: 8px; }
.brand { display: flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--ink); font-weight: 600; font-size: 1.125rem; letter-spacing: -0.01em; white-space: nowrap; }
.brand:hover { color: var(--ink); }
.mark { display: grid; grid-template-columns: repeat(2, 9px); gap: 2px; }
.mark i { width: 9px; height: 9px; border-radius: 1.5px; background: var(--accent); }
.mark i:nth-child(2) { background: var(--signal); }
.mark i:nth-child(3) { opacity: .55; }
.brand small { font-weight: 400; color: var(--ink-2); font-size: .8125rem; }
.nav { display: flex; gap: .25rem; margin-left: auto; align-items: center; }
.nav a { color: var(--ink-2); text-decoration: none; padding: .45rem .7rem; border-radius: var(--radius); font-size: .9375rem; font-weight: 500; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); background: var(--sunk); }
.nav .btn { margin-left: .5rem; }
.menu-btn { display: none; margin-left: auto; background: none; border: 1px solid var(--line); color: var(--ink); border-radius: var(--radius); padding: .45rem .7rem; font: inherit; font-size: .875rem; cursor: pointer; }
@media (max-width: 920px) {
  .menu-btn { display: inline-flex; }
  .nav { display: none; position: absolute; left: 0; right: 0; top: 100%; flex-direction: column; align-items: stretch; background: var(--surface); border-bottom: 1px solid var(--line); padding: .5rem max(16px, env(safe-area-inset-right, 0px)) 1rem max(16px, env(safe-area-inset-left, 0px)); box-shadow: var(--shadow); }
  .nav.open { display: flex; }
  .nav .btn { margin: .5rem 0 0; justify-content: center; }
}

/* buttons */
.btn { display: inline-flex; align-items: center; gap: .5rem; padding: .7rem 1.15rem; border-radius: var(--radius); font: inherit; font-weight: 600; font-size: .9375rem; text-decoration: none; border: 1px solid transparent; cursor: pointer; line-height: 1.2; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-ink); color: #fff; }
:root:not([data-theme="light"]) .btn-primary { color: var(--paper); }
@media (prefers-color-scheme: light) { :root:not([data-theme="dark"]) .btn-primary { color: #fff; } }
:root[data-theme="light"] .btn-primary { color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink-2); color: var(--ink); }
.nav .btn-primary { color: #fff; }

/* bands */
.band { padding-block: clamp(3rem, 7vw, 5.5rem); border-bottom: 1px solid var(--line); }
.band-tight { padding-block: clamp(2rem, 4vw, 3rem); }
.band-surface { background: var(--surface); }
.band-dark { background: var(--band-dark); color: var(--band-dark-ink); border-bottom-color: var(--band-dark-line); }
.band-dark .muted, .band-dark .lead { color: var(--band-dark-2); }
.band-dark .eyebrow { color: var(--accent); }
.section-head { display: grid; gap: .75rem; margin-bottom: 2.25rem; max-width: 760px; }

/* hero */
.hero { padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(2.5rem, 6vw, 4rem); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.hero h1 { margin-block: .75rem 1.1rem; }
.hero .row { margin-top: 1.75rem; }
.hero-facts { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; margin-top: 1.75rem; color: var(--ink-2); font-size: var(--step--1); }
.hero-facts span::before { content: ""; display: inline-block; width: 6px; height: 6px; background: var(--ok); border-radius: 50%; margin-right: .5rem; vertical-align: middle; }
@media (max-width: 920px) { .hero-grid { grid-template-columns: minmax(0, 1fr); } }

/* product console mock */
.console { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); overflow: hidden; min-width: 0; font-size: .875rem; }
.console-bar { display: flex; align-items: center; gap: .5rem; padding: .55rem .9rem; border-bottom: 1px solid var(--line); background: var(--sunk); font-size: .8125rem; color: var(--ink-2); }
.console-bar .dots { display: flex; gap: 5px; margin-right: .5rem; }
.console-bar .dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--line); }
.console-bar .tabs { display: flex; gap: .25rem; overflow-x: auto; }
.console-bar .tabs span { padding: .15rem .55rem; border-radius: 4px; white-space: nowrap; }
.console-bar .tabs .on { background: var(--surface); color: var(--ink); border: 1px solid var(--line); }
.console-body { padding: 1rem 1.1rem 1.15rem; display: grid; gap: .9rem; }
.console-title { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.console-title b { font-size: 1rem; }
.kv { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .5rem; }
.kv div { background: var(--sunk); border-radius: 5px; padding: .5rem .6rem; min-width: 0; }
.kv dt, .kv .k { font-size: .6875rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-2); font-family: var(--font-mono); }
.kv .v { font-weight: 600; overflow-wrap: anywhere; }
.pill { display: inline-flex; align-items: center; gap: .35rem; padding: .12rem .55rem; border-radius: 999px; font-size: .75rem; font-weight: 600; border: 1px solid currentColor; white-space: nowrap; }
.pill.ok { color: var(--ok); } .pill.warn { color: var(--warn); } .pill.info { color: var(--accent); } .pill.bad { color: var(--bad); }
.timeline { display: grid; gap: 0; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.timeline > div { display: grid; grid-template-columns: 5.6rem minmax(0, 1fr) auto; gap: .75rem; padding: .55rem .7rem; border-top: 1px solid var(--line); align-items: start; }
.timeline > div:first-child { border-top: 0; }
.timeline time { font-family: var(--font-mono); font-size: .75rem; color: var(--ink-2); padding-top: 2px; }
.timeline .sent { font-size: .75rem; color: var(--ink-2); white-space: nowrap; }
@media (max-width: 520px) { .timeline > div { grid-template-columns: minmax(0, 1fr); gap: .25rem; } .kv { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }

/* grids and cards */
.grid { display: grid; gap: 1.25rem; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 980px) { .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .g3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .g2, .g3, .g4 { grid-template-columns: minmax(0, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.35rem 1.4rem; display: flex; flex-direction: column; gap: .6rem; min-width: 0; }
.card h3 { font-size: var(--step-1); }
.card p { color: var(--ink-2); font-size: .9375rem; }
.card .more { margin-top: auto; padding-top: .4rem; font-weight: 600; font-size: .9rem; text-decoration: none; }
.card-flat { background: transparent; border: 0; border-top: 2px solid var(--ink); border-radius: 0; padding: 1rem 0 0; }
.band-dark .card-flat { border-top-color: var(--band-dark-ink); }
.band-dark .card-flat p { color: var(--band-dark-2); }

/* modules - the building blocks */
.blocks { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.blocks .blk { padding: 1.1rem 1.15rem 1.25rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); display: grid; gap: .35rem; align-content: start; min-width: 0; }
.blocks .blk:nth-child(4n) { border-right: 0; }
.blk .sw { display: flex; justify-content: space-between; align-items: center; gap: .5rem; }
.blk .sw b { font-size: .975rem; }
.toggle { width: 30px; height: 17px; border-radius: 999px; background: var(--accent); position: relative; flex: none; }
.toggle::after { content: ""; position: absolute; top: 2px; right: 2px; width: 13px; height: 13px; border-radius: 50%; background: var(--surface); }
.toggle.core { background: var(--ink-2); }
.blk p { color: var(--ink-2); font-size: .875rem; line-height: 1.5; }
.blk .tag { font-family: var(--font-mono); font-size: .6875rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-2); }
@media (max-width: 980px) { .blocks { grid-template-columns: repeat(2, minmax(0, 1fr)); } .blocks .blk:nth-child(4n) { border-right: 1px solid var(--line); } .blocks .blk:nth-child(2n) { border-right: 0; } }
@media (max-width: 560px) { .blocks { grid-template-columns: minmax(0, 1fr); } .blocks .blk { border-right: 0 !important; } }

/* feature rows */
.feature { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: clamp(1.5rem, 4vw, 3.5rem); align-items: center; }
.feature + .feature { margin-top: clamp(3rem, 7vw, 5rem); }
.feature.flip > :first-child { order: 2; }
@media (max-width: 900px) { .feature { grid-template-columns: minmax(0, 1fr); } .feature.flip > :first-child { order: 0; } }
.ticks { list-style: none; padding: 0; margin: 0; display: grid; gap: .55rem; }
.ticks li { padding-left: 1.6rem; position: relative; }
.ticks li::before { content: ""; position: absolute; left: 0; top: .45em; width: .8rem; height: .45rem; border-left: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(-45deg); }
.band-dark .ticks li::before { border-color: var(--accent); }

/* tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: .9375rem; }
th, td { text-align: left; padding: .7rem .9rem; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--sunk); font-size: .8125rem; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-2); font-weight: 600; }
tbody tr:last-child td { border-bottom: 0; }
td.c, th.c { text-align: center; }
.yes { color: var(--ok); font-weight: 700; }
.no { color: var(--ink-2); }

/* VAT box mock */
.vat { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.vat div { background: var(--surface); padding: .6rem .7rem; }
.vat .k { font-family: var(--font-mono); font-size: .6875rem; color: var(--ink-2); text-transform: uppercase; letter-spacing: .05em; }
.vat .v { font-family: var(--font-mono); font-weight: 500; font-variant-numeric: tabular-nums; }
@media (max-width: 520px) { .vat { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }

/* pricing */
.plans { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.25rem; align-items: stretch; }
@media (max-width: 920px) { .plans { grid-template-columns: minmax(0, 1fr); max-width: 520px; } }
.plan { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 1.6rem; display: flex; flex-direction: column; gap: 1rem; min-width: 0; }
.plan.featured { border: 2px solid var(--accent); box-shadow: var(--shadow); }
.plan .price { font-size: 2.25rem; font-weight: 600; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.plan .price small { font-size: .875rem; font-weight: 400; color: var(--ink-2); letter-spacing: 0; }
.plan .ticks { font-size: .9375rem; }
.plan .btn { justify-content: center; margin-top: auto; }
.draft-tag { display: inline-block; align-self: flex-start; width: max-content;font-family: var(--font-mono); font-size: .6875rem; text-transform: uppercase; letter-spacing: .06em; color: var(--signal); border: 1px solid currentColor; border-radius: 3px; padding: .05rem .4rem; }

/* faq */
.faq { display: grid; gap: 0; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 1rem 0; }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--font-mono); color: var(--ink-2); }
.faq details[open] summary::after { content: "\2212"; }
.faq details p { margin-top: .6rem; color: var(--ink-2); max-width: 70ch; }

/* heading beside content */
.split { display: grid; gap: 2rem; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }
@media (max-width: 820px) { .split { grid-template-columns: minmax(0, 1fr); } }

/* call to action band */
.cta { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2rem; align-items: center; }
@media (max-width: 760px) { .cta { grid-template-columns: minmax(0, 1fr); } }

/* forms */
.form { display: grid; gap: 1rem; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 1.5rem; min-width: 0; }
.form .two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1rem; }
@media (max-width: 560px) { .form .two { grid-template-columns: minmax(0, 1fr); } }
label { display: grid; gap: .35rem; font-size: .875rem; font-weight: 500; }
input, select, textarea { font: inherit; font-size: 1rem; padding: .65rem .75rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); color: var(--ink); width: 100%; min-width: 0; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent; }
.check { display: flex; gap: .6rem; align-items: flex-start; font-weight: 400; }
.check input { width: auto; margin-top: .3rem; }
.notice { border: 1px solid var(--line); border-left: 3px solid var(--accent); background: var(--tint); padding: .9rem 1rem; border-radius: 4px; font-size: .9375rem; }
.notice.warn { border-left-color: var(--warn); }

/* footer */
.site-foot { background: var(--band-dark); color: var(--band-dark-2); font-size: .9rem; }
.site-foot .wrap { padding-block: 3rem 2rem; display: grid; gap: 2rem; }
.foot-cols { display: grid; grid-template-columns: 1.4fr repeat(4, minmax(0, 1fr)); gap: 2rem; }
@media (max-width: 860px) { .foot-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.site-foot h4 { color: var(--band-dark-ink); font-size: .8125rem; text-transform: uppercase; letter-spacing: .08em; font-family: var(--font-mono); font-weight: 500; margin-bottom: .75rem; }
.site-foot ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .4rem; }
.site-foot a { color: var(--band-dark-2); text-decoration: none; }
.site-foot a:hover { color: var(--band-dark-ink); }
.site-foot .brand { color: var(--band-dark-ink); }
.legal { border-top: 1px solid var(--band-dark-line); padding-top: 1.25rem; font-size: .8125rem; display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; justify-content: space-between; }

/* manual / docs */
.docs { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 2.5rem; align-items: start; padding-block: 2rem 4rem; }
@media (max-width: 900px) { .docs { grid-template-columns: minmax(0, 1fr); } }
.toc { position: sticky; top: calc(80px + env(safe-area-inset-top, 0px)); max-height: calc(100vh - 100px); overflow: auto; font-size: .9rem; display: grid; gap: .75rem; }
@media (max-width: 900px) { .toc { position: static; max-height: none; border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; background: var(--surface); } }
.toc input { font-size: .9rem; padding: .5rem .65rem; }
.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: .1rem; }
.toc .grp { font-family: var(--font-mono); font-size: .6875rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-2); margin-top: .75rem; padding: 0 .5rem; }
.toc a { display: block; padding: .3rem .5rem; border-radius: 4px; text-decoration: none; color: var(--ink-2); }
.toc a:hover, .toc a.on { background: var(--sunk); color: var(--ink); }
.doc { min-width: 0; display: grid; gap: 3rem; }
.doc section { display: grid; gap: 1rem; padding-top: .5rem; scroll-margin-top: 90px; }
.doc section + section { border-top: 1px solid var(--line); padding-top: 2.5rem; }
.doc h2 { font-size: var(--step-3); }
.doc h3 { font-size: var(--step-1); margin-top: .75rem; }
.doc p, .doc li { max-width: 72ch; }
.doc ol, .doc ul { margin: 0; padding-left: 1.3rem; display: grid; gap: .4rem; }
.ui { font-family: var(--font-body); font-weight: 600; background: var(--sunk); border: 1px solid var(--line); border-radius: 4px; padding: 0 .35rem; font-size: .9em; white-space: nowrap; }
.path { font-family: var(--font-mono); font-size: .875em; color: var(--accent-ink); }
.limits { border: 1px solid var(--line); border-radius: var(--radius); padding: .9rem 1rem; background: var(--surface); }
.limits h4 { font-size: .8125rem; text-transform: uppercase; letter-spacing: .06em; font-family: var(--font-mono); color: var(--warn); font-weight: 500; margin-bottom: .4rem; }
.limits ul { color: var(--ink-2); font-size: .9375rem; }
.meta { display: flex; flex-wrap: wrap; gap: .5rem 1rem; font-size: .8125rem; color: var(--ink-2); font-family: var(--font-mono); }
.hidden-by-filter { display: none !important; }

@media (prefers-reduced-motion: no-preference) {
  .btn, .nav a, .toc a { transition: background-color .15s ease, color .15s ease, border-color .15s ease; }
}