/* ============================================================
   Vohuman — Field Notes shared stylesheet
   Reused by field-notes.html (index) and article pages.
   Shares the design tokens of the main product page.
   ============================================================ */

/* ---------- DESIGN TOKENS ---------- */
:root {
  --content-default: 960px;
  --content-wide: 1140px;
  --content-read: 720px;          /* article measure */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  --font-display: 'Zodiak', Georgia, serif;
  --font-body: 'General Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'SFMono-Regular', ui-monospace, Menlo, Consolas, monospace;
}

html[data-theme="dark"] {
  --bg-base:    #141312;
  --bg-1:       #1a1918;
  --bg-2:       #201f1d;
  --border:     #2c2a27;
  --border-soft:#242220;

  --color-text:       #e9e6df;
  --color-text-muted: #a6a199;
  --color-text-faint: #6f6a62;

  --accent:      oklch(0.78 0.16 75);
  --accent-soft: oklch(0.78 0.16 75 / 0.14);
  --accent-line: oklch(0.78 0.16 75 / 0.35);
}

html[data-theme="light"] {
  --bg-base:    #f5f4f0;
  --bg-1:       #efeee9;
  --bg-2:       #e8e6e0;
  --border:     #dcd9d1;
  --border-soft:#e4e1da;

  --color-text:       #1c1b17;
  --color-text-muted: #56524b;
  --color-text-faint: #8a857c;

  --accent:      oklch(0.68 0.14 75);
  --accent-soft: oklch(0.68 0.14 75 / 0.12);
  --accent-line: oklch(0.68 0.14 75 / 0.4);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-base);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}
h1, h2, h3, .display { font-family: var(--font-display); font-weight: 500; letter-spacing: -0.01em; }
::selection { background: var(--accent-soft); color: var(--color-text); }
a { color: inherit; text-decoration: none; }

.wrap { max-width: var(--content-default); margin: 0 auto; padding: 0 28px; }
.wrap-read { max-width: var(--content-read); margin: 0 auto; padding: 0 28px; }

.eyebrow {
  font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--accent); font-weight: 600; margin-bottom: 22px;
}

/* ---------- NAV ---------- */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 28px;
  background: color-mix(in srgb, var(--bg-base) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}
nav.scrolled { border-bottom-color: var(--border-soft); }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--font-display); font-size: 20px; font-weight: 600; letter-spacing: -0.01em; }
.brand svg { width: 24px; height: 24px; }
.nav-right { display: flex; align-items: center; gap: 24px; }
.nav-links { display: flex; gap: 22px; }
.nav-links a { font-size: 14px; color: var(--color-text-muted); transition: color 0.2s; }
.nav-links a:hover { color: var(--color-text); }
.nav-links a.current { color: var(--accent); }
.nav-cta {
  font-size: 14px; padding: 8px 16px; border: 1px solid var(--accent-line);
  border-radius: 2px; color: var(--accent); transition: background 0.2s, color 0.2s;
}
.nav-cta:hover { background: var(--accent); color: var(--bg-base); }
.theme-toggle {
  width: 34px; height: 34px; display: grid; place-items: center;
  background: none; border: 1px solid var(--border); border-radius: 2px;
  color: var(--color-text-muted); cursor: pointer; transition: color 0.2s, border-color 0.2s;
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--accent-line); }
.theme-toggle svg { width: 17px; height: 17px; }
html[data-theme="dark"] .icon-sun { display: block; }
html[data-theme="dark"] .icon-moon { display: none; }
html[data-theme="light"] .icon-sun { display: none; }
html[data-theme="light"] .icon-moon { display: block; }

/* mobile menu toggle (hamburger) — hidden on desktop */
.nav-toggle { display: none; width: 34px; height: 34px; position: relative; background: none; border: 1px solid var(--border); border-radius: 2px; cursor: pointer; }
.nav-toggle:hover { border-color: var(--accent-line); }
.nav-toggle span { position: absolute; left: 8px; right: 8px; height: 1.5px; background: var(--color-text-muted); transition: transform 0.25s var(--ease), opacity 0.2s, top 0.25s var(--ease); }
.nav-toggle span:nth-child(1) { top: 11px; }
.nav-toggle span:nth-child(2) { top: 16px; }
.nav-toggle span:nth-child(3) { top: 21px; }
nav.open .nav-toggle span:nth-child(1) { top: 16px; transform: rotate(45deg); }
nav.open .nav-toggle span:nth-child(2) { opacity: 0; }
nav.open .nav-toggle span:nth-child(3) { top: 16px; transform: rotate(-45deg); }
.nav-cta-mobile { display: none; }

/* ---------- PAGE HEADER ---------- */
.page-head { padding: 168px 0 64px; border-bottom: 1px solid var(--border-soft); }
.page-head h1 { font-size: clamp(40px, 6vw, 68px); line-height: 1.0; font-weight: 600; letter-spacing: -0.025em; }
.page-head .lead { margin-top: 26px; color: var(--color-text-muted); max-width: 56ch; font-size: 18px; }

/* ---------- INDEX: entry list ---------- */
.entries { padding: 24px 0 100px; }
.entry {
  display: block; padding: 38px 0; border-bottom: 1px solid var(--border-soft);
  transition: opacity 0.2s;
}
.entry:hover .entry-title { color: var(--accent); }
.entry-meta { display: flex; gap: 14px; align-items: center; font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--color-text-faint); margin-bottom: 14px; }
.entry-meta .tag { color: var(--accent); }
.entry-title { font-family: var(--font-display); font-size: clamp(24px, 3vw, 32px); line-height: 1.15; color: var(--color-text); transition: color 0.2s; max-width: 24ch; }
.entry-dek { margin-top: 14px; color: var(--color-text-muted); max-width: 62ch; font-size: 16.5px; }
.entry-more { margin-top: 16px; display: inline-flex; gap: 8px; align-items: center; font-size: 14px; color: var(--accent); transition: gap 0.2s var(--ease); }
.entry:hover .entry-more { gap: 13px; }

/* ---------- ARTICLE ---------- */
.article-head { padding: 150px 0 48px; }
.article-back { display: inline-flex; gap: 8px; align-items: center; font-size: 14px; color: var(--color-text-muted); margin-bottom: 34px; transition: color 0.2s, gap 0.2s var(--ease); }
.article-back:hover { color: var(--accent); gap: 12px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; font-size: 12px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--color-text-faint); margin-bottom: 22px; }
.article-meta .tag { color: var(--accent); }
.article-title { font-family: var(--font-display); font-weight: 600; font-size: clamp(34px, 5vw, 56px); line-height: 1.05; letter-spacing: -0.02em; max-width: 20ch; }
.article-sub { margin-top: 22px; font-family: var(--font-display); font-weight: 400; font-style: italic; font-size: clamp(18px, 2.4vw, 24px); color: var(--color-text-muted); max-width: 40ch; line-height: 1.35; }

/* editor's note */
.ed-note {
  margin: 8px 0 8px; padding: 22px 24px; border: 1px solid var(--border);
  border-left: 2px solid var(--accent-line); border-radius: 3px; background: var(--bg-1);
  color: var(--color-text-muted); font-size: 15.5px; line-height: 1.6;
}
.ed-note strong { color: var(--color-text); font-weight: 500; }

/* article body typography */
.article-body { padding: 12px 0 90px; }
.article-body > * { max-width: var(--content-read); }
.article-body h2 {
  font-size: clamp(24px, 3.4vw, 32px); line-height: 1.15; margin: 56px 0 6px;
  padding-top: 30px; border-top: 1px solid var(--border-soft);
}
.article-body h2:first-child { margin-top: 14px; border-top: none; padding-top: 0; }
.article-body h3 { font-size: 20px; line-height: 1.25; color: var(--color-text); margin: 38px 0 4px; }
.article-body .sec-sub { color: var(--color-text-faint); font-style: italic; font-family: var(--font-display); font-size: 16px; margin-bottom: 18px; }
.article-body p { color: var(--color-text-muted); margin: 18px 0; font-size: 17.5px; line-height: 1.7; }
.article-body p strong, .article-body li strong { color: var(--color-text); font-weight: 600; }
.article-body em { font-style: italic; }
.article-body a.inline { color: var(--accent); border-bottom: 1px solid var(--accent-line); }

.callout {
  margin: 22px 0; padding: 18px 22px; background: var(--bg-1);
  border: 1px solid var(--border); border-left: 2px solid var(--accent-line);
  border-radius: 3px; color: var(--color-text-muted); font-size: 16px; line-height: 1.6;
}
.callout strong { color: var(--color-text); }

.brief {
  margin: 20px 0; padding-left: 18px; border-left: 2px solid var(--accent-line);
  color: var(--color-text); font-size: 17.5px; line-height: 1.6;
}
.brief .lbl { color: var(--accent); font-weight: 600; }

hr.rule { border: none; border-top: 1px solid var(--border-soft); margin: 50px 0; max-width: var(--content-read); }

pre {
  margin: 22px 0; padding: 16px 18px; background: var(--bg-2); border: 1px solid var(--border);
  border-radius: 4px; overflow-x: auto; font-family: var(--font-mono); font-size: 14px;
  color: var(--color-text); line-height: 1.5;
}
code { font-family: var(--font-mono); font-size: 0.9em; color: var(--accent); }
pre code { color: inherit; }

/* table — breaks out wider than the reading measure so all columns fit */
.table-wrap {
  margin: 30px 0; overflow-x: auto; border: 1px solid var(--border); border-radius: 4px;
  max-width: none; width: min(960px, 92vw); margin-left: 50%; transform: translateX(-50%);
}
table.data { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 860px; }
table.data th, table.data td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--border-soft); vertical-align: top; }
table.data thead th { color: var(--accent); font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; font-size: 11.5px; background: var(--bg-1); }
table.data tbody tr:last-child td { border-bottom: none; }
table.data td:first-child { color: var(--color-text); font-weight: 500; }
table.data td { color: var(--color-text-muted); }

.signoff { margin-top: 40px; padding-top: 26px; border-top: 1px solid var(--border-soft); color: var(--color-text-faint); font-size: 15px; font-style: italic; max-width: var(--content-read); }
.signoff p { margin: 4px 0; }

/* ---------- FOOTER ---------- */
footer { border-top: 1px solid var(--border-soft); padding: 64px 0 56px; }
.footer-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 40px; flex-wrap: wrap; gap: 18px; }
.footer-meta { font-size: 14px; color: var(--color-text-faint); }
.footer-links { display: flex; gap: 20px; font-size: 14px; }
.footer-links a { color: var(--color-text-muted); transition: color 0.2s; }
.footer-links a:hover { color: var(--accent); }

/* ---------- REVEAL ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .nav-cta { display: none; }
  .nav-links {
    display: flex; flex-direction: column; align-items: stretch; gap: 0;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--bg-1);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 22px 44px -22px rgba(0,0,0,0.65);
    padding: 6px 28px 16px;
    opacity: 0; transform: translateY(-8px); pointer-events: none;
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }
  nav.open .nav-links { opacity: 1; transform: none; pointer-events: auto; }
  .nav-links a { padding: 14px 2px; font-size: 16px; border-top: 1px solid var(--border-soft); }
  .nav-links a:first-child { border-top: none; }
  .nav-cta-mobile { display: block; margin-top: 6px; color: var(--accent); }
  .page-head { padding-top: 128px; }
  .article-head { padding-top: 116px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}