:root {
  --bg: #F3EEE4;
  --ink: #1A1916;
  --plum: #5C3148;
  --mustard: #A6853C;
  --slate: #5E6770;
  --moss: #5D6A48;
  --line: #DDD4C6;
  --max: 1170px;
  --read: 720px;
  --serif: Georgia, "Palatino Linotype", Palatino, serif;
  --sans: "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, Consolas, monospace;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.55;
  background-color: var(--bg);
  background-image: url("/assets/svg/rules.svg");
  background-size: 28px 28px;
  background-blend-mode: multiply;
}
body { background-color: #F3EEE4; }
a { color: var(--plum); }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; line-height: 1.2; }
h1 { font-size: 2.2rem; margin: 0 0 0.6rem; }
h2 { font-size: 1.6rem; margin: 0 0 0.7rem; }
p { margin: 0 0 0.75rem; }
.kicker { margin: 0 0 0.35rem; font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--plum); }
.page { max-width: var(--max); margin: 0 auto; padding: 18px 16px 48px; }
.read { max-width: var(--read); background: rgba(243,238,228,0.94); }
.mast-wrap { border-bottom: 1px solid var(--line); background: rgba(243,238,228,0.96); position: relative; }
.mast { height: 56px; max-width: var(--max); margin: 0 auto; padding: 0 16px; display: flex; align-items: center; justify-content: space-between; }
.brand { color: var(--ink); text-decoration: none; font-family: var(--serif); font-size: 1.15rem; }
.nav { display: flex; gap: 14px; }
.nav a { color: var(--ink); text-decoration: none; font-size: 0.92rem; }
.nav a[aria-current="page"] { color: var(--plum); }
.nav-toggle { display: none; background: transparent; border: 1px solid var(--ink); font-family: var(--mono); font-size: 0.75rem; padding: 4px 8px; }
.block { margin: 36px 0; }
.daily { display: grid; grid-template-columns: repeat(12, 1fr); gap: 20px; background: rgba(243,238,228,0.94); border-top: 3px solid var(--plum); padding-top: 12px; }
.daily-main { grid-column: span 9; }
.daily-side { grid-column: span 3; }
.riddle-q { font-family: var(--serif); font-size: 1.8rem; line-height: 1.3; }
.meta b { display: block; font-size: 0.7rem; letter-spacing: 0.06em; color: var(--slate); font-weight: 600; }
.bar { display: flex; gap: 10px; flex-wrap: wrap; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 10px 0; margin-top: 12px; }
button, .text-btn { font-family: var(--sans); background: transparent; border: 1px solid var(--plum); color: var(--plum); padding: 6px 10px; cursor: pointer; }
.answer { color: var(--moss); }
.row { display: grid; gap: 8px 16px; align-items: center; border-top: 1px solid var(--line); padding: 10px 0; }
.row-1 { grid-template-columns: 1fr auto; }
.row-2 { grid-template-columns: 3rem 1fr auto; }
.row-3 { grid-template-columns: 1fr; }
.row-4 { grid-template-columns: 7rem 1fr auto; }
.row-5 { grid-template-columns: 1fr 8rem auto; }
.row-6 { grid-template-columns: 4rem 1fr auto; }
.row [data-box] { grid-column: 1 / -1; }
.num { font-family: var(--mono); color: var(--mustard); font-size: 1.4rem; }
.stair { display: flex; flex-direction: column; gap: 12px; }
.step-card { border-top: 1px solid var(--line); padding: 10px 0; background: rgba(243,238,228,0.94); }
.step-card:nth-child(1) { margin-right: 28%; }
.step-card:nth-child(2) { margin-left: 14%; margin-right: 14%; }
.step-card:nth-child(3) { margin-left: 28%; }
.step-card h3 { font-family: var(--mono); color: var(--plum); letter-spacing: 0.04em; }
.drawer { display: grid; grid-template-columns: 180px 1fr auto; gap: 8px 16px; border: 1px solid var(--line); border-left: 6px solid var(--mustard); padding: 10px 12px; margin: 0 0 8px; background: rgba(243,238,228,0.92); }
.drawer h3 { margin: 0; font-size: 0.95rem; letter-spacing: 0.06em; }
.count { font-family: var(--mono); color: var(--slate); }
.logic-1 { display: grid; grid-template-columns: 1.4fr 0.6fr; gap: 18px; }
.logic-2 { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 18px; }
.logic-3 { text-align: center; }
.seq { font-family: var(--mono); font-size: 1.4rem; letter-spacing: 0.04em; }
.boxes { display: flex; gap: 8px; }
.box { border: 1px solid var(--ink); padding: 10px; min-width: 90px; text-align: center; font-size: 0.85rem; }
.rail { display: flex; gap: 16px; overflow-x: auto; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 8px 0; }
.rail article { flex: 0 0 220px; }
.think { display: grid; grid-template-columns: 5fr 7fr; gap: 24px; }
.method { font-family: var(--mono); color: var(--plum); }
.method div { border-top: 1px solid var(--line); padding: 8px 0; }
.lib { list-style: none; padding: 0; margin: 0; }
.lib li { border-top: 1px solid var(--line); padding: 8px 0; display: grid; grid-template-columns: 2rem 1fr; }
.lib a { font-family: var(--serif); font-size: 1.15rem; color: var(--ink); }
.split { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 24px; }
.foot { border-top: 1px solid var(--line); padding: 14px 16px 28px; }
.foot-in { max-width: var(--max); margin: 0 auto; }
.foot nav { display: flex; flex-wrap: wrap; gap: 8px 14px; }
.foot a { color: var(--ink); }
.lib-item { border-top: 1px solid var(--line); padding: 10px 0; }
.layout-8 { display: grid; grid-template-columns: 8fr 4fr; gap: 28px; }
@media (max-width: 760px) {
  .nav-toggle { display: inline-block; }
  .nav { display: none; position: absolute; top: 56px; left: 8px; right: 8px; flex-direction: column; background: var(--bg); border: 1px solid var(--line); padding: 10px; z-index: 2; }
  .nav.is-open { display: flex; }
  .daily, .logic-1, .logic-2, .think, .split, .layout-8, .drawer, .row-1, .row-2, .row-4, .row-5, .row-6 { display: block; }
  .step-card { margin: 0 !important; }
  h1 { font-size: 1.7rem; }
  .riddle-q { font-size: 1.35rem; }
}