/* Simple Tree — shared styles */
:root {
  --bg: #faf8f3;
  --bg-card: #ffffff;
  --bg-accent: #eef3ea;
  --text: #23301f;
  --text-soft: #5b6656;
  --green: #2e6b45;
  --green-deep: #1f4b30;
  --border: #e3e0d6;
  --shadow: 0 1px 3px rgba(31, 60, 40, 0.08), 0 4px 16px rgba(31, 60, 40, 0.06);
  --radius: 14px;
  --good: #2e6b45;
  --near: #a86b0a;
  --below: #8a5a52;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151a14;
    --bg-card: #1d241c;
    --bg-accent: #212b20;
    --text: #e9e8df;
    --text-soft: #a8b0a0;
    --green: #82c398;
    --green-deep: #a5d8b6;
    --border: #313a2f;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    --good: #82c398;
    --near: #d9a94f;
    --below: #cf9188;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: Georgia, "Times New Roman", serif; line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: 2.1rem; margin: 0.4em 0 0.5em; }
h2 { font-size: 1.5rem; margin: 1.8em 0 0.5em; }
h3 { font-size: 1.15rem; margin: 1.4em 0 0.4em; }
p { margin: 0.8em 0; }
a { color: var(--green); text-underline-offset: 3px; }
a:hover { color: var(--green-deep); }
img { max-width: 100%; height: auto; border-radius: 12px; }
.wrap { max-width: 780px; margin: 0 auto; padding: 0 20px; }
.wrap-wide { max-width: 980px; margin: 0 auto; padding: 0 20px; }

/* Header */
header.site {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
header.site .inner {
  max-width: 980px; margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.logo { display: flex; align-items: center; gap: 9px; font-family: Georgia, serif; font-size: 1.15rem; font-weight: 700; color: var(--text); text-decoration: none; }
.logo svg { display: block; }
nav.main { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
nav.main a {
  text-decoration: none; color: var(--text-soft); font-size: 0.95rem;
  padding: 6px 11px; border-radius: 8px;
}
nav.main a:hover, nav.main a[aria-current="page"] { color: var(--text); background: var(--bg-accent); }

/* Mobile hamburger (checkbox toggle, no JS) */
.nav-toggle { display: none; }
.nav-burger { display: none; }
@media (max-width: 700px) {
  .nav-burger {
    display: block; margin-left: auto; cursor: pointer;
    padding: 10px; border-radius: 8px;
  }
  .nav-burger:hover { background: var(--bg-accent); }
  .nav-burger span {
    display: block; width: 22px; height: 2px; background: var(--text);
    border-radius: 2px; transition: transform 0.2s ease, opacity 0.2s ease;
  }
  .nav-burger span + span { margin-top: 5px; }
  .nav-toggle:checked + .nav-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle:checked + .nav-burger span:nth-child(2) { opacity: 0; }
  .nav-toggle:checked + .nav-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  nav.main { display: none; flex-direction: column; gap: 2px; width: 100%; padding-top: 10px; margin-left: 0; }
  .nav-toggle:checked ~ nav.main { display: flex; }
  nav.main a { padding: 11px 12px; font-size: 1.05rem; }
}

/* Hero */
.hero { padding: 52px 0 30px; }
.hero .kicker { color: var(--green); font-weight: 600; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.08em; margin: 0; }
.hero h1 { font-size: 2.5rem; margin: 0.25em 0 0.3em; }
.hero .lede { font-size: 1.2rem; color: var(--text-soft); max-width: 42em; }
@media (max-width: 600px) { .hero h1 { font-size: 1.9rem; } }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; margin: 26px 0; }
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 24px; box-shadow: var(--shadow);
}
.card h3 { margin-top: 0.2em; }
.card p { color: var(--text-soft); font-size: 0.97rem; }
.card .cta { font-weight: 600; text-decoration: none; }
a.card-link { text-decoration: none; color: inherit; display: block; }
a.card-link:hover .card { border-color: var(--green); }

/* Buttons */
.btn {
  display: inline-block; background: var(--green); color: #fff; text-decoration: none;
  padding: 11px 22px; border-radius: 10px; font-weight: 600; border: none; font-size: 1rem; cursor: pointer;
}
.btn:hover { background: var(--green-deep); color: #fff; }
@media (prefers-color-scheme: dark) { .btn { color: #10160f; } .btn:hover { color: #10160f; } }
.btn-soft { background: var(--bg-accent); color: var(--green-deep); }
.btn-soft:hover { background: var(--border); }

/* Tables */
.table-scroll { overflow-x: auto; margin: 1.2em 0; border: 1px solid var(--border); border-radius: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; background: var(--bg-card); }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { background: var(--bg-accent); font-weight: 600; font-size: 0.88rem; }
tr:last-child td { border-bottom: none; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

/* Callouts */
.note {
  background: var(--bg-accent); border-left: 4px solid var(--green);
  padding: 14px 18px; border-radius: 0 10px 10px 0; margin: 1.4em 0; font-size: 0.97rem;
}
.note.amber { border-left-color: var(--near); }
.updated { color: var(--text-soft); font-size: 0.88rem; margin-top: -0.4em; }

/* FAQ */
.faq { margin: 1.5em 0; }
.faq h3 { margin: 1.6em 0 0.3em; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-size: 1.05rem; font-weight: 650; }
.faq p { margin-top: 0.2em; }

/* Screenshots */
.shots { display: flex; gap: 16px; margin: 26px 0; overflow-x: auto; padding-bottom: 8px; }
.shots > * { flex: 0 0 auto; }  /* the flex item is the <picture>, not the <img> */
.shots img { width: 230px; flex-shrink: 0; box-shadow: var(--shadow); }

/* iPad screenshots (2-up grid) */
.shots-ipad { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 22px 0; }
.shots-ipad img { width: 100%; box-shadow: var(--shadow); }
.shots-ipad figure { margin: 0; }
.shots-ipad figcaption { font-size: 0.85rem; color: var(--text-soft); margin-top: 8px; text-align: center; }
@media (max-width: 620px) { .shots-ipad { grid-template-columns: 1fr; } }

/* Calculator */
.calc {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow); margin: 1.5em 0;
}
.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 560px) { .calc-grid { grid-template-columns: 1fr; } }
.calc fieldset { border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; margin: 0; }
.calc legend { font-weight: 650; padding: 0 6px; }
.calc label { display: block; font-size: 0.88rem; color: var(--text-soft); margin: 8px 0 3px; }
.calc input[type="number"], .calc select {
  width: 100%; padding: 9px 10px; font-size: 1.05rem; border: 1px solid var(--border);
  border-radius: 8px; background: var(--bg); color: var(--text);
}
.calc-result { text-align: center; margin: 22px 0 6px; }
.calc-result .composite { font-size: 3rem; font-family: Georgia, serif; font-weight: 700; color: var(--green-deep); line-height: 1.1; }
.calc-result .sections { color: var(--text-soft); font-size: 0.95rem; }
.status-above { color: var(--good); font-weight: 650; }
.status-near { color: var(--near); font-weight: 650; }
.status-below { color: var(--below); }
.smallprint { font-size: 0.85rem; color: var(--text-soft); }

/* Contact form */
form.contact { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); margin: 1.5em 0; }
form.contact .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { form.contact .form-grid { grid-template-columns: 1fr; } }
form.contact label { display: block; font-size: 0.9rem; font-weight: 600; margin: 12px 0 0; }
form.contact label:first-child { margin-top: 0; }
form.contact input[type="text"], form.contact input[type="email"], form.contact select, form.contact textarea {
  width: 100%; margin-top: 5px; padding: 10px; font-size: 1rem; font-family: inherit;
  border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--text);
}
form.contact textarea { resize: vertical; }
form.contact .consent { display: flex; gap: 9px; align-items: flex-start; font-weight: 400; font-size: 0.88rem; color: var(--text-soft); margin: 16px 0; }
form.contact .consent input { margin-top: 3px; }
form.contact .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* Footer */
footer.site {
  margin-top: 70px; border-top: 1px solid var(--border); padding: 34px 0 44px;
  color: var(--text-soft); font-size: 0.92rem;
}
footer.site .inner { max-width: 980px; margin: 0 auto; padding: 0 20px; display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 20px; }
footer.site h4 { margin: 0 0 8px; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text); }
footer.site ul { list-style: none; margin: 0; padding: 0; }
footer.site li { margin: 5px 0; }
footer.site a { color: var(--text-soft); text-decoration: none; }
footer.site a:hover { color: var(--green); }
.copyright { max-width: 980px; margin: 26px auto 0; padding: 0 20px; font-size: 0.85rem; }

/* Article layout */
article.guide { padding-top: 30px; }
article.guide .backlink { font-size: 0.9rem; text-decoration: none; }
.byline { color: var(--text-soft); font-size: 0.92rem; }
.divider { border: none; border-top: 1px solid var(--border); margin: 2.5em 0; }