:root {
  --chalk: #f3eee4;
  --oxide: #9a3412;
  --oxide-soft: #c2410c;
  --navy: #1b2744;
  --navy-ink: #12192c;
  --rule: #c4b8a4;
  --mute: #5c564c;
  --bad: #9f1239;
  --ok: #365314;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }

body.notebook {
  margin: 0;
  min-height: 100vh;
  background-color: var(--chalk);
  background-image:
    radial-gradient(ellipse at 20% 10%, rgba(27, 39, 68, 0.05) 0 40%, transparent 42%),
    radial-gradient(ellipse at 80% 30%, rgba(154, 52, 18, 0.06) 0 35%, transparent 38%),
    repeating-radial-gradient(circle at 10% 80%, transparent 0 28px, rgba(27, 39, 68, 0.04) 29px 30px),
    linear-gradient(90deg, transparent 56px, rgba(154, 52, 18, 0.45) 56px, rgba(154, 52, 18, 0.45) 58px, transparent 58px),
    repeating-linear-gradient(180deg, transparent 0 27px, rgba(27, 39, 68, 0.06) 27px 28px);
  color: var(--navy-ink);
  font-family: "Source Serif 4", "Times New Roman", serif;
  font-size: 17.5px;
  line-height: 1.7;
  padding-left: 72px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }

h1, h2, h3, .mark-word {
  font-family: Syne, "Arial Narrow", sans-serif;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0 0 0.7rem;
  text-transform: uppercase;
}

h1 { font-size: clamp(1.8rem, 4vw, 3rem); }

p { margin: 0 0 1rem; }

.skip-note {
  position: absolute;
  left: 80px;
  top: -44px;
  background: var(--navy);
  color: var(--chalk);
  padding: 8px 12px;
  z-index: 70;
  text-decoration: none;
  font-family: Syne, sans-serif;
  font-size: 12px;
}
.skip-note:focus { top: 12px; }

:focus { outline: none; }
:focus-visible { outline: 2px solid var(--oxide); outline-offset: 3px; }

.field-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 4vw 10px 0;
  border-bottom: 1px dashed var(--rule);
}

.mark-word {
  font-size: 1.1rem;
  text-decoration: none;
}

.mark-word em {
  font-style: normal;
  color: var(--oxide);
}

.fold-burger {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--navy);
  background: transparent;
  cursor: pointer;
  padding: 8px;
}

.fold-burger i {
  display: block;
  height: 2px;
  background: var(--navy);
  margin: 6px 0;
}

.sheet-nav {
  display: flex;
  gap: 20px;
  font-family: Syne, sans-serif;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.sheet-nav a { text-decoration: none; }
.sheet-nav a[aria-current="page"] { color: var(--oxide); }

.field-main {
  width: min(1080px, 92%);
  padding: 36px 0 80px;
}

.sec-no {
  font-family: Syne, sans-serif;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--oxide);
}

.lede-note {
  font-size: 1.15rem;
  max-width: 58ch;
  color: var(--mute);
}

.topo {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 36px 0 48px;
  border: 1px solid var(--navy);
}

.topo figure {
  margin: 0;
  grid-column: 1 / -1;
  border-bottom: 1px solid var(--navy);
}

.topo figcaption {
  font-family: Syne, sans-serif;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 8px 10px;
  background: var(--navy);
  color: var(--chalk);
}

.cell {
  padding: 16px 14px 20px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  min-height: 150px;
}

.cell:nth-child(3n) { border-right: 0; }

.elev {
  font-family: Syne, sans-serif;
  font-size: 11px;
  color: var(--oxide);
  letter-spacing: 0.08em;
}

.note-cols {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 18px;
  margin: 28px 0;
}

.note-cols .sec-no { padding-top: 4px; }

.book-foot {
  border-top: 1px solid var(--navy);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding: 24px 4vw 40px 0;
  font-size: 15px;
}

.book-foot h3 {
  font-size: 12px;
  color: var(--oxide);
}

.book-foot a { color: var(--navy); }

.sheet-form {
  display: grid;
  gap: 12px;
  max-width: 460px;
  border: 1px solid var(--navy);
  padding: 18px;
  background: rgba(255, 255, 255, 0.45);
}

.sheet-form label {
  font-family: Syne, sans-serif;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.sheet-form input,
.sheet-form textarea {
  width: 100%;
  border: 0;
  border-bottom: 1px dashed var(--navy);
  background: transparent;
  padding: 8px 0;
  font: 16px/1.4 "Source Serif 4", serif;
}

.sheet-form textarea { min-height: 110px; resize: vertical; }

.check-n {
  display: flex;
  gap: 8px;
  text-transform: none;
  letter-spacing: 0;
  font-family: "Source Serif 4", serif;
  font-size: 15px;
  align-items: flex-start;
}
.check-n input { width: auto; }

.hint { display: none; color: var(--bad); font-size: 14px; margin: 0; }
.is-bad .hint { display: block; }

.send-oxide {
  justify-self: start;
  background: var(--oxide);
  color: var(--chalk);
  border: 0;
  padding: 10px 14px;
  font-family: Syne, sans-serif;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 11px;
  cursor: pointer;
}

.ok-fold {
  border: 1px solid var(--ok);
  background: #ecfccb;
  padding: 18px;
  max-width: 460px;
}

.pair-note {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.cookie-fold {
  position: fixed;
  left: 72px;
  bottom: 16px;
  z-index: 40;
  max-width: 340px;
  background: var(--navy);
  color: var(--chalk);
  padding: 14px;
  font-size: 14px;
}

.cookie-fold p { margin: 0 0 10px; }
.cookie-fold a { color: #fdba74; }
.cookie-fold button {
  font-family: Syne, sans-serif;
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-right: 6px;
  border: 1px solid var(--chalk);
  background: transparent;
  color: var(--chalk);
  padding: 7px 9px;
  cursor: pointer;
}
.cookie-fold [data-cookie="accepted"] { background: var(--oxide); border-color: var(--oxide); }

body.lock-fold { overflow: hidden; }

@media (max-width: 920px) {
  body.notebook { padding-left: 20px; }
  .fold-burger { display: block; }
  .field-bar { position: relative; padding-right: 16px; }
  .sheet-nav {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    background: var(--chalk);
    border: 1px solid var(--navy);
    flex-direction: column;
    padding: 14px 16px 20px;
    z-index: 20;
  }
  .sheet-nav.is-open { display: flex; }
  .topo,
  .pair-note,
  .book-foot { grid-template-columns: 1fr; }
  .note-cols { grid-template-columns: 1fr; }
  .cookie-fold { left: 16px; right: 16px; max-width: none; }
}

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