/* ============================================================
   Occamly. Premium-minimal editorial.
   System font stacks only. Zero external requests.
   ============================================================ */

:root {
  --serif: Charter, "Bitstream Charter", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Segoe UI Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* Light theme */
  --bg: #faf8f4;
  --bg-soft: #f3efe7;
  --ink: #1a1916;
  --ink-soft: #57534a;
  --ink-faint: #8a8479;
  --rule: #e3ddd1;
  --accent: #b8742b;
  --accent-ink: #fbfaf7;
  --card: #ffffff;
  --shadow: 0 1px 2px rgba(26, 25, 22, .04), 0 8px 24px rgba(26, 25, 22, .05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f0e;
    --bg-soft: #16150f;
    --ink: #f2efe8;
    --ink-soft: #b3ada1;
    --ink-faint: #837d72;
    --rule: #2a2823;
    --accent: #e09a4e;
    --accent-ink: #14130f;
    --card: #17160f;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 12px 28px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent); color: var(--accent-ink); }

a { color: inherit; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding-inline: clamp(20px, 5vw, 56px); }
.wrap-rule { max-width: 1080px; margin-inline: auto; padding-inline: clamp(20px, 5vw, 56px); }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; z-index: 100; border-radius: 0 0 8px 0;
  font-family: var(--mono); font-size: 13px;
}
.skip-link:focus { left: 0; }

/* ---------- Hairline rules ---------- */
.rule { border: 0; border-top: 1px solid var(--rule); height: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--rule);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand-mark { color: var(--accent); display: block; }
.brand-word { font-family: var(--serif); font-size: 21px; letter-spacing: .2px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 13px; letter-spacing: .04em;
  text-decoration: none; cursor: pointer;
  padding: 11px 20px; border-radius: 999px;
  transition: transform .15s ease, background .15s ease, color .15s ease, border-color .15s ease;
  border: 1px solid transparent; white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-solid { background: var(--accent); color: var(--accent-ink); }
.btn-solid:hover { background: color-mix(in srgb, var(--accent) 86%, #000); }
.btn-line { border-color: var(--rule); color: var(--ink); background: transparent; }
.btn-line:hover { border-color: var(--accent); color: var(--accent); }
.btn-ghost { color: var(--ink-soft); padding-inline: 14px; }
.btn-ghost:hover { color: var(--accent); }
.btn-lg { font-size: 15px; padding: 15px 28px; }

/* ---------- Hero ---------- */
.hero { padding-top: clamp(64px, 12vw, 132px); padding-bottom: clamp(56px, 10vw, 104px); }
.eyebrow {
  font-family: var(--mono); font-size: 13px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 24px;
}
.hero-title {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  line-height: 1.04; letter-spacing: -.015em;
  margin: 0; max-width: 16ch;
}
.hero-title em { font-style: italic; color: var(--accent); }
.lede {
  font-size: clamp(1.05rem, 2.4vw, 1.32rem); color: var(--ink-soft);
  max-width: 54ch; margin: 28px 0 0; line-height: 1.55;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 40px; }

/* ---------- Sections ---------- */
.section { padding-block: clamp(56px, 9vw, 96px); }
.section-head { max-width: 60ch; margin-bottom: clamp(36px, 5vw, 56px); }
.kicker {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--ink-faint); margin: 0 0 16px;
}
.section-title {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(1.7rem, 4vw, 2.5rem); line-height: 1.1;
  letter-spacing: -.01em; margin: 0;
}
.section-lede { color: var(--ink-soft); margin: 18px 0 0; max-width: 50ch; }

/* ---------- Grids & cards ---------- */
.grid { display: grid; gap: clamp(20px, 3vw, 32px); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 820px) { .grid-3 { grid-template-columns: 1fr; } }

.card {
  background: var(--card); border: 1px solid var(--rule);
  border-radius: 14px; padding: clamp(24px, 3vw, 32px);
  box-shadow: var(--shadow);
}
.card-title {
  font-family: var(--serif); font-weight: 400; font-size: 1.32rem;
  line-height: 1.2; margin: 0 0 12px;
}
.card p { margin: 0; color: var(--ink-soft); font-size: 1rem; }
.card-index {
  font-family: var(--mono); font-size: 13px; color: var(--accent);
  margin: 0 0 18px; letter-spacing: .1em;
}

/* ---------- Whitepapers ---------- */
.papers {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: clamp(18px, 2.4vw, 26px);
}
@media (max-width: 700px) { .papers { grid-template-columns: 1fr; } }

.paper {
  border: 1px solid var(--rule); border-radius: 14px;
  background: var(--card); box-shadow: var(--shadow);
  transition: transform .18s ease, border-color .18s ease;
}
.paper-link {
  display: block; text-decoration: none; color: inherit;
  padding: clamp(22px, 3vw, 30px);
}
.paper:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 50%, var(--rule)); }
.paper-meta {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--ink-faint); margin: 0 0 12px;
}
.paper-title { font-family: var(--serif); font-weight: 400; font-size: 1.32rem; margin: 0 0 10px; line-height: 1.2; }
.paper-blurb { color: var(--ink-soft); margin: 0 0 18px; font-size: 1rem; }
.paper-cta { font-family: var(--mono); font-size: 13px; color: var(--accent); }
.paper-static { padding: clamp(22px, 3vw, 30px); }
.paper-soon { padding: clamp(22px, 3vw, 30px); opacity: .92; }
.paper-soon .paper-title { color: var(--ink-soft); }
.paper-cta-link { font-family: var(--mono); font-size: 13px; color: var(--accent); text-decoration: none; }
.paper-cta-link:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Principal ---------- */
.principal-body { max-width: 60ch; }
.principal-body p { color: var(--ink-soft); margin: 0 0 18px; }
.principal-links { font-family: var(--mono); font-size: 14px; display: flex; gap: 12px; align-items: center; }
.principal-links a { color: var(--accent); text-decoration: none; }
.principal-links a:hover { text-decoration: underline; text-underline-offset: 3px; }
.principal-links span { color: var(--ink-faint); }

/* ---------- Contact ---------- */
.contact-inner {
  background: var(--bg-soft); border: 1px solid var(--rule);
  border-radius: 18px; padding: clamp(36px, 6vw, 64px);
  text-align: center;
}
.contact-inner .kicker { margin-bottom: 18px; }
.contact-lede { color: var(--ink-soft); max-width: 46ch; margin: 18px auto 30px; font-size: 1.1rem; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--rule); margin-top: clamp(40px, 8vw, 80px); }
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 8px 24px;
  align-items: baseline; justify-content: space-between;
  padding-block: 32px;
}
.footer-tag { font-family: var(--serif); font-style: italic; color: var(--ink-soft); margin: 0; }
.footer-meta { font-family: var(--mono); font-size: 12.5px; color: var(--ink-faint); margin: 0; }

/* ---------- Focus states ---------- */
a:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px;
}

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; transition: none; }
}