:root {
  --paper: oklch(0.965 0.018 82);
  --paper-2: oklch(0.94 0.022 78);
  --ink: oklch(0.24 0.028 45);
  --ink-soft: oklch(0.42 0.02 50);
  --rule: oklch(0.86 0.02 80);
  --lacquer: oklch(0.46 0.13 32);
  --lacquer-deep: oklch(0.38 0.12 30);
  --sage: oklch(0.42 0.055 145);
  --sage-soft: oklch(0.93 0.025 145);
  --note: oklch(0.955 0.035 85);
  --focus: oklch(0.55 0.12 40);
  --shadow: 0 1px 0 oklch(0.24 0.03 45 / 0.06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, oklch(0.97 0.03 75 / 0.9), transparent 50%),
    var(--paper);
  font-family: "Sora", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

.page {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 0;
  max-width: 1120px;
  margin: 0 auto;
  min-height: 100vh;
}

.rail {
  padding: 2.25rem 1.25rem 3rem;
  border-right: 1px solid var(--rule);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
}

.mark {
  font-family: "Fraunces", Georgia, serif;
  font-optical-sizing: auto;
  font-weight: 620;
  font-size: 1.5rem;
  letter-spacing: 0.04em;
  line-height: 1.15;
  margin: 0 0 0.35rem;
}

.mark span { color: var(--lacquer); }

.rail-kicker {
  margin: 0 0 1.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.rail a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.45rem 0;
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  font-size: 0.92rem;
}

.rail a:hover { color: var(--lacquer-deep); }

.rail a .n {
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
  color: var(--ink-soft);
}

.progress {
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.bar {
  height: 4px;
  background: var(--rule);
  margin: 0.45rem 0 0.35rem;
  overflow: hidden;
}

.bar > i {
  display: block;
  height: 100%;
  width: 0;
  background: var(--lacquer);
  transition: width 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.save {
  margin-top: 1.25rem;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.save.ok { color: var(--sage); }

main {
  padding: 2.25rem 2.5rem 5rem;
}

.lede {
  max-width: 62ch;
  margin: 0 0 2rem;
}

h1 {
  font-family: "Fraunces", Georgia, serif;
  font-weight: 620;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 0.6rem;
}

.lede p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 58ch;
}

.lede .subname {
  font-family: "Fraunces", Georgia, serif;
  font-size: 1.05rem;
  color: var(--lacquer);
  margin: 0 0 0.7rem;
  letter-spacing: -0.01em;
}

.add {
  display: grid;
  grid-template-columns: 1fr 180px auto;
  gap: 0.5rem;
  margin: 0 0 2.25rem;
  padding: 0.85rem 0 0;
  border-top: 1px solid var(--rule);
}

.add input, .add select, .add button, .note textarea {
  font: inherit;
  color: inherit;
  background: oklch(0.99 0.01 82);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 0.55rem 0.7rem;
}

.add input:focus, .add select:focus, .add button:focus-visible,
.item input:focus-visible, .note textarea:focus {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.add button {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
  cursor: pointer;
  padding-inline: 1rem;
}

.add button:hover { background: var(--lacquer-deep); border-color: var(--lacquer-deep); }

.chapter {
  margin: 0 0 2.75rem;
}

.chapter h2 {
  font-family: "Fraunces", Georgia, serif;
  font-weight: 600;
  font-size: 1.35rem;
  margin: 0 0 0.2rem;
  letter-spacing: -0.02em;
}

.kicker {
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.pres {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.85rem;
  margin: 0 0 1rem;
}
.pres a {
  color: var(--lacquer-deep);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid oklch(0.46 0.13 32 / 0.35);
}
.pres a:hover { border-bottom-color: var(--lacquer); }

.list { display: flex; flex-direction: column; }

.item {
  display: grid;
  grid-template-columns: 1.35rem minmax(0, 1fr) auto;
  gap: 0.7rem 0.85rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--rule);
  align-items: start;
}

.item:first-of-type { border-top: 1px solid var(--rule); }

.item label {
  cursor: pointer;
}

.item input[type="checkbox"] {
  appearance: none;
  width: 1.15rem;
  height: 1.15rem;
  margin: 0.15rem 0 0;
  border: 1.5px solid var(--ink);
  border-radius: 2px;
  background: oklch(0.99 0.01 82);
  cursor: pointer;
  display: grid;
  place-items: center;
}

.item input[type="checkbox"]::after {
  content: "";
  width: 0.55rem;
  height: 0.3rem;
  border-left: 2px solid var(--paper);
  border-bottom: 2px solid var(--paper);
  transform: rotate(-45deg) scale(0);
  translate: 0 -0.08rem;
  transition: transform 0.16s cubic-bezier(0.16, 1, 0.3, 1);
}

.item input[type="checkbox"]:checked {
  background: var(--lacquer);
  border-color: var(--lacquer);
}

.item input[type="checkbox"]:checked::after { transform: rotate(-45deg) scale(1); }

.item.done label {
  color: var(--ink-soft);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
  text-decoration-color: oklch(0.24 0.03 45 / 0.45);
}

.item .hint {
  grid-column: 2;
  margin: 0.15rem 0 0;
  font-size: 0.82rem;
  color: var(--ink-soft);
  max-width: 62ch;
}

.item.done .hint { text-decoration: none; }

.del {
  appearance: none;
  background: none;
  border: 0;
  color: var(--ink-soft);
  cursor: pointer;
  font: inherit;
  font-size: 0.75rem;
  padding: 0.1rem 0;
}

.del:hover { color: var(--lacquer); }

.facts {
  margin: 1.25rem 0 0;
  padding: 1rem 1.1rem 0.85rem;
  background: var(--paper-2);
  border: 1px solid var(--rule);
}

.facts h3 {
  margin: 0 0 0.7rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--lacquer-deep);
}

.facts dl {
  margin: 0;
  display: grid;
  gap: 0.55rem 1rem;
}

.facts dt {
  font-weight: 600;
  font-size: 0.88rem;
}

.facts dd {
  margin: 0.15rem 0 0;
  font-size: 0.84rem;
  color: var(--ink-soft);
  max-width: 70ch;
}

.reflections {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--ink);
}

.reflections h2 {
  font-family: "Fraunces", Georgia, serif;
  font-size: 1.5rem;
  margin: 0 0 0.35rem;
}

.reflections > p {
  margin: 0 0 1.25rem;
  color: var(--ink-soft);
  max-width: 58ch;
}

.note {
  padding: 1rem 0 1.2rem;
  border-bottom: 1px solid var(--rule);
}

.note h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
}

.note .seed {
  margin: 0 0 0.6rem;
  font-size: 0.88rem;
  color: var(--ink-soft);
  max-width: 65ch;
}

.note textarea {
  width: 100%;
  min-height: 5.5rem;
  resize: vertical;
  background: var(--note);
  line-height: 1.45;
}

.filter {
  display: flex;
  gap: 0.5rem;
  margin: 0 0 1.5rem;
}

.filter button {
  appearance: none;
  background: none;
  border: 1px solid var(--rule);
  padding: 0.3rem 0.65rem;
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
  color: var(--ink-soft);
}

.filter button[aria-pressed="true"] {
  border-color: var(--ink);
  color: var(--ink);
}

@media (max-width: 840px) {
  .page { grid-template-columns: 1fr; }
  .rail {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
    padding: 1.25rem 1.25rem 1rem;
  }
  .rail nav {
    display: flex;
    gap: 0.85rem;
    overflow-x: auto;
    padding-bottom: 0.4rem;
  }
  .rail a { white-space: nowrap; border: 0; }
  .progress { display: none; }
  main { padding: 1.5rem 1.25rem 4rem; }
  .add { grid-template-columns: 1fr; }
}