/* Site theme: warm off-white paper, ink text, one blue accent. No gradients, no dark mode. */
:root {
  --bg: #faf8f3;
  --surface: #ffffff;
  --surface-2: #f2eee5;
  --text: #1c2230;
  --text-2: #5a6273;
  --border: #e4ded1;
  --accent: #1f4e9e;
  --accent-hover: #173d7e;
  --accent-soft: #e7edf7;
  --excellent: #2e8b57;
  --good: #7cb342;
  --fair: #b8930b;
  --weak: #d9731a;
  --dead: #c0392b;
  --radius: 10px;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Source Sans 3", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 var(--sans); }
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { color: var(--accent-hover); }
h1, h2, h3, .h1, .h3 { font-family: var(--serif); font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; color: var(--text); }
h1, .h1 { font-size: clamp(30px, 4.4vw, 42px); margin: 0 0 12px; }
h2 { font-size: clamp(23px, 3vw, 28px); margin: 40px 0 12px; }
h3, .h3 { font-size: 20px; margin: 24px 0 8px; }
.h3 { margin-top: 0; }
p { margin: 0 0 14px; }
code { font-size: 0.9em; background: var(--surface-2); padding: 1px 6px; border-radius: 4px; }
.muted { color: var(--text-2); }
.small { font-size: 14px; }
.center { text-align: center; }
.lead { font-size: 19px; color: var(--text-2); max-width: 720px; }
.center .lead { margin-left: auto; margin-right: auto; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 99; }
.skip:focus { left: 8px; }
[hidden] { display: none !important; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 780px; }
.narrow-left { max-width: 780px; }
main { min-height: 60vh; padding-bottom: 56px; }

/* Header */
.site-header { background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20; }
.site-header .wrap { display: flex; align-items: center; gap: 20px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 18px; }
.brand:hover { color: var(--text); }
.nav { margin-left: auto; display: flex; gap: 2px; }
.nav a { color: var(--text-2); text-decoration: none; font-weight: 600; font-size: 15px; padding: 8px 12px; border-radius: 8px; }
.nav a:hover { color: var(--text); background: var(--surface-2); }
.nav a[aria-current="page"] { color: var(--accent); }
.nav-toggle { display: none; margin-left: auto; background: none; border: 1px solid var(--border); border-radius: 8px; padding: 6px 8px; color: var(--text); cursor: pointer; }
@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--surface); border-bottom: 1px solid var(--border); flex-direction: column; padding: 8px 12px 12px; }
  .nav.open { display: flex; }
  .nav a { padding: 12px; }
}

/* Buttons & forms */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 10px 18px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text); font: 600 16px var(--sans); text-decoration: none; cursor: pointer; }
.btn:hover { border-color: #cfc7b6; color: var(--text); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.btn.big { min-height: 52px; padding: 12px 24px; font-size: 17px; }
.btn.sm { min-height: 38px; padding: 6px 12px; font-size: 14px; }
.btn.danger { color: var(--dead); }
.btn.link { border-color: transparent; background: transparent; color: var(--accent); }
.btn.grow { flex: 1; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 8px; }
.btn-row.center { justify-content: center; }
input[type="text"], input[type="number"], input[type="email"], select, textarea {
  font: 16px var(--sans); color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 9px 12px; min-height: 44px; width: 100%; }
input:focus, select:focus, textarea:focus, .btn:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.field { display: grid; gap: 6px; font-size: 14px; font-weight: 600; color: var(--text-2); }
.field.sm { width: 120px; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; margin-top: 12px; }
.check input { margin-top: 5px; }
.notice { background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 10px 14px; font-size: 15px; }
.notice.warn { border-color: var(--weak); background: #fdf3e8; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.grid-2 { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-2.tight { gap: 12px; grid-template-columns: 1fr 1fr; }

/* Speed test (home) */
.speed { padding: 40px 0 32px; background: var(--surface); border-bottom: 1px solid var(--border); }
.speed-title { font-family: var(--sans); font-size: 18px; font-weight: 600; color: var(--text-2); margin: 0 0 18px; letter-spacing: 0; }
.speed-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; max-width: 760px; margin: 0 auto; }
.speed-box { display: grid; justify-items: center; align-content: start; gap: 2px; padding: 20px 10px 16px; border: 1px solid var(--border); border-radius: 12px; background: var(--bg); transition: border-color 0.2s, background 0.2s; }
.speed-box.active { border-color: var(--accent); background: var(--surface); box-shadow: 0 0 0 3px var(--accent-soft); }
.speed-label { font-size: 15px; font-weight: 700; color: var(--text-2); text-transform: uppercase; letter-spacing: 0.08em; }
.speed-num { font-size: clamp(46px, 12vw, 104px); font-weight: 700; line-height: 1.05; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; color: var(--text-2); transition: color 0.4s; }
.speed-unit { font-size: clamp(16px, 2.6vw, 22px); color: var(--text-2); font-weight: 600; }
.speed-tier { font-size: 14px; font-weight: 700; color: var(--text-2); min-height: 1.4em; margin-top: 2px; }
.speed-bar { height: 5px; max-width: 760px; margin: 20px auto 8px; background: var(--surface-2); border-radius: 4px; overflow: hidden; }
.speed-bar span { display: block; height: 100%; width: 0; background: var(--accent); transition: width 0.25s linear, background 0.4s; }
.speed-phase { color: var(--text-2); min-height: 1.6em; margin-bottom: 12px; }
.speed-actions { display: flex; justify-content: center; gap: 8px; flex-wrap: wrap; margin: 16px 0 4px; }
.speed .notice { max-width: 560px; margin: 16px auto 0; }
.speed .metrics { max-width: 760px; margin: 0 auto; }
.metrics { display: grid; gap: 10px; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 640px) { .metrics { grid-template-columns: repeat(4, 1fr); } }
.metric { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; display: grid; gap: 0; text-align: center; }
.metric .k { font-size: 13px; color: var(--text-2); font-weight: 600; }
.metric .v { color: var(--text-2); font-size: 14px; }
.metric b { font-size: 26px; color: var(--text); font-variant-numeric: tabular-nums; transition: color 0.4s; }
.metric.sm { padding: 8px 10px; }
.metric.sm b { font-size: 20px; }
.speed .result { max-width: 760px; margin: 20px auto 0; text-align: left; }
@media (max-width: 420px) {
  .speed-pair { gap: 8px; }
  .speed-box { padding: 14px 6px 12px; }
  .speed-label { font-size: 13px; }
}
.result { margin-top: 14px; display: grid; gap: 20px; grid-template-columns: 1fr; align-items: center; }
@media (min-width: 760px) { .result { grid-template-columns: 220px 1fr; } }
.result-score, .score-card { display: grid; justify-items: center; text-align: center; gap: 2px; }
.result-score .k, .score-card .k { font-size: 13px; font-weight: 700; color: var(--text-2); text-transform: uppercase; letter-spacing: 0.06em; }
.score { font-size: 72px; font-weight: 700; line-height: 1; font-variant-numeric: tabular-nums; }
.grade { font-weight: 700; font-size: 18px; }
.uses { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); }
.uses li { display: flex; align-items: center; gap: 10px; font-size: 15px; padding: 8px 10px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; }
.uses .dot { width: 10px; height: 10px; border-radius: 50%; flex: none; }
.tone-excellent { color: var(--excellent); } .tone-good { color: var(--good); } .tone-fair { color: var(--fair); }
.tone-weak { color: var(--weak); } .tone-dead { color: var(--dead); } .tone-muted { color: var(--text-2); }

/* Tool cards */
.tools { padding: 32px 0 8px; }
.tool-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.tool { display: grid; grid-template-columns: auto 1fr auto; gap: 16px; align-items: center; text-decoration: none; color: var(--text); }
.tool:hover { border-color: var(--accent); color: var(--text); }
.tool strong { display: block; font-size: 18px; margin-bottom: 2px; }
.tool .muted { font-size: 15px; display: block; }
.tool-ico { width: 44px; height: 44px; border-radius: 8px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); }
.page-content { padding: 16px 0 8px; }

/* Posts */
.latest { padding: 24px 0 8px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin: 32px 0 16px; }
.section-head h2 { margin: 0; }
.section-head a { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; text-decoration: none; }
.post-grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); }
.post-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; }
.post-card-img img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.post-card-body { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.post-card-title { margin: 0; font-size: 20px; }
.post-card-title a { color: var(--text); text-decoration: none; }
.post-card-title a:hover { color: var(--accent); }
.post-card p { margin: 0; font-size: 15px; }
.post-card .meta { margin-top: auto; padding-top: 6px; font-size: 13px; color: var(--text-2); }
.eyebrow { font-size: 13px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 0.06em; text-decoration: none; }
.list-head { margin: 8px 0 24px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { padding: 6px 14px; border: 1px solid var(--border); border-radius: 999px; background: var(--surface); color: var(--text-2); text-decoration: none; font-weight: 600; font-size: 14px; }
.chip.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.pager { display: flex; align-items: center; justify-content: center; gap: 16px; margin-top: 32px; }

/* Article */
.crumbs { font-size: 14px; color: var(--text-2); padding: 20px 0 8px; }
.crumbs a { color: var(--text-2); }
.crumbs span { margin: 0 4px; }
.post-layout { display: grid; gap: 40px; grid-template-columns: 1fr; }
@media (min-width: 1000px) { .post-layout { grid-template-columns: minmax(0, 760px) 260px; } }
.article-head .meta { color: var(--text-2); font-size: 15px; }
.hero-img { border-radius: var(--radius); margin: 8px 0 24px; border: 1px solid var(--border); }
.post-side .toc { position: sticky; top: 88px; font-size: 15px; }
@media (max-width: 999px) { .post-side { display: none; } } /* on phones it would land below the article */
.toc ol { padding-left: 18px; margin: 10px 0 0; }
.toc li { margin: 6px 0; }
.toc a { color: var(--text-2); text-decoration: none; }
.toc a:hover { color: var(--accent); }
.cta { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; margin: 36px 0 8px; background: var(--accent-soft); border-color: #cfdaee; }
.cta p { margin: 4px 0 0; }
.contact-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin-top: 24px; }
.contact-card { display: grid; gap: 4px; align-content: start; }
.contact-card .k { font-size: 13px; font-weight: 700; color: var(--text-2); text-transform: uppercase; letter-spacing: 0.06em; }
.author-box { display: grid; grid-template-columns: auto 1fr; gap: 16px; margin: 36px 0 0; padding: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.author-avatar { width: 56px; height: 56px; border-radius: 50%; background: var(--accent); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 20px; }
.author-name { display: block; font-size: 19px; margin: 2px 0 6px; }
.author-box p { margin: 0 0 6px; font-size: 16px; }
.author-links { font-size: 15px; }
.notfound { padding: 80px 20px; }

/* Prose */
.prose { font-size: 18px; line-height: 1.7; }
.prose > :first-child { margin-top: 0; }
.prose li { margin: 6px 0; }
.prose ul, .prose ol { padding-left: 24px; margin: 0 0 16px; }
.prose img { border-radius: 8px; }
.prose blockquote { margin: 20px 0; padding: 4px 18px; border-left: 3px solid var(--accent); color: var(--text-2); }
.prose table { width: 100%; border-collapse: collapse; margin: 16px 0 20px; font-size: 16px; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; vertical-align: top; }
.prose th { background: var(--surface-2); }
.prose details { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 14px 16px; margin: 10px 0; }
.prose summary { font-weight: 700; cursor: pointer; }
.prose details p { margin: 10px 0 0; color: var(--text-2); }

/* Tools: walk & heatmap */
.tool-intro { padding-top: 28px; }
.steps { margin: 0; padding-left: 20px; }
.steps li { margin: 6px 0; }
.status { font-weight: 600; color: var(--text-2); margin: 24px 0 12px; }
.live { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 900px) { .live { grid-template-columns: 340px 1fr; } }
.live-side, .live-main { display: grid; gap: 12px; align-content: start; }
.score-card { padding: 24px; }
.meter { width: 100%; height: 8px; background: var(--surface-2); border-radius: 4px; overflow: hidden; margin-top: 12px; }
.meter span { display: block; height: 100%; width: 0; transition: width 0.3s; }
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.mark-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
.tag-list { display: grid; gap: 8px; margin-top: 12px; }
.tag-item { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 9px 12px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; font-size: 15px; }
.canvas-box { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; touch-action: none; }
.canvas-box canvas { display: block; width: 100%; height: 100%; }
.trail-box { height: 420px; }
.chart-box { height: 180px; }
.legend { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; font-size: 13px; color: var(--text-2); }
.legend .sw { width: 14px; height: 10px; border-radius: 2px; display: inline-block; }
.toolbar { display: flex; flex-wrap: wrap; align-items: end; gap: 8px; margin: 12px 0; }
.toolbar select { width: auto; min-width: 170px; }
.hm-layout { display: grid; gap: 16px; }
@media (min-width: 940px) { .hm-layout { grid-template-columns: 1fr 300px; } }
.hm-main, .hm-side { display: grid; gap: 10px; align-content: start; }
.hm-box { aspect-ratio: 4 / 3; cursor: crosshair; }
.seg { display: inline-flex; background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 3px; justify-self: start; }
.seg button { border: 0; background: transparent; font: 600 14px var(--sans); color: var(--text-2); padding: 8px 12px; border-radius: 6px; cursor: pointer; min-height: 38px; }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--accent); box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08); }
.overlay-msg { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; background: rgba(250, 248, 243, 0.88); font-weight: 700; padding: 20px; }
.upload { position: relative; }

/* Footer */
.site-footer { background: var(--surface); border-top: 1px solid var(--border); padding: 40px 0 24px; font-size: 15px; }
.footer-grid { display: grid; gap: 28px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.footer-grid .muted { margin-top: 10px; max-width: 300px; }
.footer-h { font-family: var(--sans); font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-2); margin: 0 0 10px; }
.footer-links { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.footer-links a { color: var(--text); text-decoration: none; }
.footer-links a:hover { color: var(--accent); text-decoration: underline; }
.footer-base { margin-top: 28px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--text-2); font-size: 14px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; }
.footer-base a { color: var(--text); font-weight: 600; }