/* One stylesheet, system fonts, no external resources. Colours follow the app's emerald brand. */
:root {
  --bg: #F4F7F6; --surface: #FFFFFF; --text: #14201D; --muted: #475753; --line: #D5E0DC;
  --accent: #0A7A5F; --accent-ink: #FFFFFF; --deep: #063F37; --focus: #0A7A5F;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0B1412; --surface: #13211E; --text: #E8F1EE; --muted: #9FB5AF; --line: #25372F;
    --accent: #2BD4A4; --accent-ink: #04261F; --deep: #0A5C50; --focus: #2BD4A4;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 1rem/1.6 var(--font); }
.wrap { width: 100%; max-width: 46rem; margin: 0 auto; padding: 0 1rem; }
a { color: var(--accent); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
.skip { position: absolute; left: -999px; top: 0; background: var(--surface); color: var(--text); padding: .75rem 1rem; z-index: 10; }
.skip:focus { left: 0; }

.site-header { border-bottom: 1px solid var(--line); }
.bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .25rem 1rem; padding-top: .5rem; padding-bottom: .5rem; }
.brand { display: inline-flex; align-items: center; gap: .6rem; min-height: 44px; font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.brand img { border-radius: 7px; }
nav { display: flex; flex-wrap: wrap; gap: 0 .25rem; }
nav a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 .6rem; color: var(--text); text-decoration: none; border-radius: 8px; }
nav a:hover { color: var(--accent); }
nav a[aria-current="page"] { font-weight: 700; text-decoration: underline; text-decoration-color: var(--accent); text-decoration-thickness: 3px; text-underline-offset: .35em; }

main { padding-top: 1.5rem; padding-bottom: 3rem; }
h1, h2, h3 { line-height: 1.25; }
h1 { font-size: clamp(1.9rem, 6vw, 2.6rem); margin: 0 0 .5rem; }
h2 { font-size: 1.4rem; margin: 2.2rem 0 .5rem; }
h3 { font-size: 1.1rem; margin: 0 0 .5rem; }
p, ul, ol { margin: 0 0 1rem; }
ul, ol { padding-left: 1.3rem; }
li { margin-bottom: .35rem; }
.small { font-size: .9rem; color: var(--muted); }
.updated { color: var(--muted); font-weight: 600; }

.hero { text-align: center; padding: 1.5rem 0 .5rem; }
.app-icon { border-radius: 22px; box-shadow: 0 2px 10px rgba(0,0,0,.18); }
.lead { font-size: 1.2rem; max-width: 34rem; margin: 0 auto 1.25rem; }
.soon { display: inline-block; margin: 0 0 .5rem; padding: .55rem 1.1rem; border: 2px solid var(--accent); border-radius: 999px; color: var(--text); }
.button { display: inline-flex; align-items: center; min-height: 44px; padding: 0 1.2rem; background: var(--accent); color: var(--accent-ink); font-weight: 700; border-radius: 12px; text-decoration: none; }

.grid { display: grid; gap: 1rem; grid-template-columns: 1fr; margin: 1rem 0; }
@media (min-width: 40rem) { .grid { grid-template-columns: 1fr 1fr; } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 1rem 1.1rem .5rem; }

.email { font-family: var(--mono); font-size: .95em; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: .1em .4em; -webkit-user-select: all; user-select: all; overflow-wrap: anywhere; }
.prose { overflow-wrap: break-word; }
.prose h2 { margin-top: 1.8rem; }
.toc { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: .25rem .5rem; }
.toc li { margin: 0; }
.toc a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 .8rem; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); text-decoration: none; }

details { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; margin: 0 0 .6rem; padding: 0 1rem; }
details[open] { padding-bottom: .4rem; }
summary { min-height: 44px; display: flex; align-items: center; cursor: pointer; font-weight: 600; padding: .5rem 0; }
:target { scroll-margin-top: 1rem; }
details:target { border-color: var(--accent); }

.site-footer { border-top: 1px solid var(--line); padding: 1.25rem 0 2rem; color: var(--muted); font-size: .9rem; }
.site-footer p { margin: 0 0 .4rem; }
.site-footer a { color: var(--muted); }
@media (max-width: 26rem) { .wrap { padding: 0 1rem; } nav a { padding: 0 .45rem; } }