:root {
  --bg: #F3EEE4;
  --ink: #2C2A26;
  --brick: #8C4A3A;
  --teal: #5E7472;
  --guide: #C9C3B6;
  --line: #D5CFC3;
  --max: 1160px;
  --read: 720px;
  --serif: Georgia, "Palatino Linotype", Palatino, serif;
  --sans: "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.02rem;
  line-height: 1.55;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(44, 42, 38, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(44, 42, 38, 0.045) 1px, transparent 1px);
  background-size: 24px 24px;
}
img, svg { max-width: 100%; height: auto; }
a { color: var(--brick); text-decoration-thickness: 1px; text-underline-offset: 0.15em; }
a:hover { color: #632e24; }
p { margin: 0 0 0.8rem; }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; line-height: 1.2; }
h1 { font-size: 2.35rem; margin: 0 0 0.7rem; }
h2 { font-size: 1.7rem; margin: 0 0 0.8rem; }
h3 { font-size: 1.15rem; margin: 0 0 0.4rem; }
.kicker {
  margin: 0 0 0.4rem;
  color: var(--brick);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.mono, .time, .num { font-family: var(--mono); }
.page { max-width: var(--max); margin: 0 auto; padding: 22px 18px 56px; }
.read, .panel, .step, .tile, .level, .dir-row, .note-block, .shape-card {
  background: rgba(243, 238, 228, 0.94);
}
.read { max-width: var(--read); }

.mast-wrap {
  border-bottom: 1px solid var(--line);
  background: rgba(243, 238, 228, 0.96);
  position: relative;
}
.mast {
  height: 58px;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.15rem;
  text-decoration: none;
}
.nav { display: flex; gap: 16px; align-items: center; }
.nav a { color: var(--ink); text-decoration: none; font-size: 0.95rem; }
.nav a[aria-current="page"] { color: var(--brick); }
.nav-toggle {
  display: none;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  padding: 4px 8px;
  border-radius: 2px;
}

.block { margin: 42px 0; }
.pick {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 28px 32px;
  align-items: start;
}
.pick-copy { grid-column: span 7; }
.pick-result { grid-column: span 5; }
.filters { display: flex; flex-wrap: wrap; gap: 14px 22px; margin: 16px 0; }
.filters label { display: block; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--teal); margin-bottom: 4px; }
select, .pick-btn {
  font-family: var(--sans);
  font-size: 1rem;
  color: var(--ink);
  background: rgba(243, 238, 228, 0.96);
  border: 1px solid var(--ink);
  border-radius: 2px;
  padding: 7px 10px;
}
.pick-btn {
  background: var(--brick);
  color: #F3EEE4;
  border-color: var(--brick);
  cursor: pointer;
  margin-top: 6px;
}
.pick-btn:hover { background: #743c2f; }
.panel {
  border-top: 2px solid var(--brick);
  padding: 14px 0 0;
}
.panel h2 { font-size: 1.8rem; margin-bottom: 0.6rem; }
.meta { margin: 0 0 0.35rem; }
.meta b { font-family: var(--mono); font-weight: 500; font-size: 0.78rem; letter-spacing: 0.04em; color: var(--teal); }

.today {
  display: grid;
  grid-template-columns: 180px 1fr 1.1fr;
  gap: 12px 20px;
  align-items: center;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
  background: rgba(243, 238, 228, 0.94);
}
.today strong { font-family: var(--serif); font-weight: 500; }
.today a { font-family: var(--serif); font-size: 1.35rem; color: var(--ink); }

.mosaic {
  display: grid;
  grid-template-columns: 1.25fr 0.9fr 0.95fr;
  grid-template-areas:
    "mug cactus cloud"
    "cat house berry";
  gap: 22px 26px;
}
.t1 { grid-area: mug; }
.t2 { grid-area: cactus; }
.t3 { grid-area: cloud; }
.t4 { grid-area: cat; }
.t5 { grid-area: house; }
.t6 { grid-area: berry; }
.tile { padding: 4px 0 8px; border-top: 1px solid var(--line); }
.t1 h3, .t5 h3 { font-size: 2rem; }
.t3 { border-top: 0; padding-top: 0; }
.mini-steps { margin: 0; padding-left: 1.1rem; }
.mini-steps li { margin: 0.15rem 0; }
.formula { font-family: var(--mono); color: var(--teal); }

.ladder { display: flex; flex-direction: column; }
.level {
  display: grid;
  grid-template-columns: 150px 1fr 1.4fr;
  gap: 10px 22px;
  align-items: baseline;
  border-top: 1px solid var(--line);
  padding: 14px 0;
}
.level h3 { margin: 0; color: var(--brick); font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.06em; }
.level .ex { font-family: var(--serif); font-size: 1.15rem; }

.seq {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.step { padding: 8px 8px 12px; border-top: 1px solid var(--teal); }
.step .num { color: var(--brick); font-size: 0.8rem; }
.step svg, .sketch svg { display: block; width: 100%; background: transparent; }
.used { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 10px; }
.used span { display: inline-block; margin-right: 16px; }

.directory {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 40px;
}
.dir-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 12px;
  border-top: 1px solid var(--line);
  padding: 10px 0 12px;
}
.dir-row p { margin: 0; }
.dir-row .count { font-family: var(--mono); color: var(--teal); }

.fivemin {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 10px 0 14px;
}
.five { flex: 0 0 120px; }
.five svg { width: 88px; height: 72px; }
.five strong { display: block; font-family: var(--serif); font-weight: 500; }
.five span { font-family: var(--mono); font-size: 0.75rem; color: var(--teal); }

.shapes { display: flex; flex-direction: column; gap: 16px; }
.shape-row {
  display: grid;
  grid-template-columns: 140px 36px 140px 1fr;
  gap: 8px 14px;
  align-items: center;
  border-top: 1px solid var(--line);
  padding-top: 10px;
}
.shape-row svg { width: 120px; height: 90px; }
.arrow { font-family: var(--mono); color: var(--brick); font-size: 1.3rem; }
.shape-label { font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.05em; text-transform: uppercase; color: var(--teal); }

.lib { list-style: none; margin: 0; padding: 0; counter-reset: lib; }
.lib li {
  counter-increment: lib;
  display: grid;
  grid-template-columns: 2.2rem 1fr auto;
  gap: 8px;
  border-top: 1px solid var(--line);
  padding: 8px 0;
  align-items: baseline;
}
.lib li::before {
  content: counter(lib, decimal-leading-zero);
  font-family: var(--mono);
  color: var(--teal);
}
.lib a { font-family: var(--serif); font-size: 1.2rem; color: var(--ink); }

.notes { list-style: none; margin: 0; padding: 0; }
.notes li { border-top: 1px solid var(--line); padding: 8px 0; }
.notes a { font-family: var(--serif); font-size: 1.2rem; color: var(--ink); }

.split { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 28px 40px; }
address { font-style: normal; }

.foot { border-top: 1px solid var(--line); background: rgba(243, 238, 228, 0.96); padding: 16px 18px 28px; }
.foot-in { max-width: var(--max); margin: 0 auto; }
.foot p { margin: 0 0 0.35rem; font-family: var(--serif); }
.foot nav { display: flex; flex-wrap: wrap; gap: 8px 14px; margin: 6px 0; }
.foot a { color: var(--ink); }

.idea-list { list-style: none; margin: 0 0 1.4rem; padding: 0; }
.idea-list li { border-top: 1px solid var(--line); padding: 7px 0; display: grid; grid-template-columns: 1.2fr 0.7fr 1fr; gap: 8px; }
.idea-list a { color: var(--ink); font-family: var(--serif); }

.steps-page .step { margin-bottom: 18px; }
.steps-page .step svg { max-width: 280px; }
.finished { max-width: 320px; border-top: 1px solid var(--brick); padding-top: 8px; }

@media (max-width: 760px) {
  h1 { font-size: 1.85rem; }
  .nav-toggle { display: inline-block; }
  .nav {
    display: none;
    position: absolute;
    top: 58px;
    left: 8px;
    right: 8px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 10px 12px 12px;
    background: var(--bg);
    border: 1px solid var(--line);
    z-index: 2;
  }
  .nav.is-open { display: flex; }
  .pick, .today, .mosaic, .level, .seq, .directory, .split, .shape-row, .idea-list li {
    display: block;
  }
  .pick-copy, .pick-result { grid-column: auto; }
  .today strong, .today a { display: block; }
  .level { padding: 12px 0; }
  .fivemin { flex-wrap: nowrap; }
  .shape-row .arrow { display: inline-block; transform: rotate(90deg); margin: 4px 0; }
  .lib li { grid-template-columns: 2rem 1fr; }
  .lib .time { grid-column: 2; }
}