/* longnoteai.com — shared styles. Bump ?v= in every page after changing this file. */
:root {
  --bg: #F4F5F2;
  --card: #FFFFFF;
  --text: #1C1C1E;
  --muted: #5E6066;
  --line: #E3E4E0;
  --brand: #5B3FD6;
  --brand-soft: #ECE8FB;
  --radius: 18px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --card: #1B1B1F;
    --text: #F2F2F5;
    --muted: #A3A3AD;
    --line: #2C2C33;
    --brand: #A493F7;
    --brand-soft: #241F3A;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--brand); text-underline-offset: 2px; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

header.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 20px 0; }
.brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--text); text-decoration: none; font-weight: 700; font-size: 19px;
  font-family: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, sans-serif;
}
.brand img { width: 32px; height: 32px; border-radius: 9px; }
nav { display: flex; gap: 18px; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }

h1, h2, h3 { font-family: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, sans-serif; line-height: 1.2; }
h1 { font-size: clamp(34px, 7vw, 52px); letter-spacing: -0.02em; margin: 36px 0 12px; }
.lead { font-size: 20px; color: var(--muted); margin: 0 0 28px; }
.pill {
  display: inline-block; margin-top: 28px;
  background: var(--brand-soft); color: var(--brand);
  border-radius: 999px; padding: 6px 14px; font-size: 15px; font-weight: 600;
}

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 28px 0; }
@media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15.5px; }

article h1 { font-size: clamp(30px, 6vw, 42px); margin-top: 28px; }
article h2 { font-size: 22px; margin: 36px 0 8px; }
article ul { padding-left: 22px; }
article li { margin: 6px 0; }
.muted { color: var(--muted); }
.note { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 18px; }

table { width: 100%; border-collapse: collapse; font-size: 15.5px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; }

details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 18px; margin: 10px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 2px; color: var(--muted); }

footer { padding: 40px 0 48px; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); margin-right: 16px; }