/* 일본각. The heatmap is the page; everything else stays quiet around it.
   Numbers are set in B612 (drawn for aircraft cockpit displays), Korean in the system face. */

@font-face {
  font-family: "B612";
  src: url("/fonts/b612-latin-400-normal.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "B612";
  src: url("/fonts/b612-latin-700-normal.woff2") format("woff2");
  font-weight: 700;
  font-display: swap;
}

:root {
  --bg: #fafbfb;
  --panel: #ffffff;
  --ink: #16283a;
  --muted: #5d6b78;
  --faint: #a9b3bb;
  --rule: #dfe4e8;
  --hatch: #cfd6db;
  --kr: #c2362f;
  --jp: #3f4fbf;

  /* Cheap is deep teal, dear is burnt orange: a blue–orange pair stays apart for colour-blind eyes. */
  --l0: #0e5f6e; --l0-ink: #e8f6f7;
  --l1: #8acfd0; --l1-ink: #063b43;
  --l2: #e9edec; --l2-ink: #3d4a4f;
  --l3: #f4c7a1; --l3-ink: #5a2c08;
  --l4: #b5501a; --l4-ink: #fff1e6;

  --ko: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Noto Sans KR", "Malgun Gothic", sans-serif;
  --num: "B612", var(--ko);
  --city-w: 112px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1720;
    --panel: #16212c;
    --ink: #e6edf2;
    --muted: #9aa8b4;
    --faint: #56636f;
    --rule: #2a3742;
    --hatch: #33414d;
    --kr: #ff8a80;
    --jp: #9aa8ff;
    --l0: #5fd4da; --l0-ink: #05343a;
    --l1: #2a7f88; --l1-ink: #dff6f7;
    --l2: #27323b; --l2-ink: #b9c4cc;
    --l3: #7a4a26; --l3-ink: #ffe3c9;
    --l4: #e07a38; --l4-ink: #2a1203;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.5 var(--ko);
}
.top, main, .foot { max-width: 1160px; margin: 0 auto; padding: 0 20px; }

/* Header */
.top { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 16px; padding-top: 22px; padding-bottom: 14px; }
.mark { margin: 0; font-size: 26px; font-weight: 800; letter-spacing: -0.02em; line-height: 1; }
/* 각 means "angle": the mark carries one. */
.gak {
  display: inline-block; width: 11px; height: 11px; margin-left: 5px;
  border-top: 4px solid var(--l4); border-right: 4px solid var(--l4);
  transform: translateY(-9px);
}
.lede { margin: 0; color: var(--muted); }

/* Controls */
.controls { display: flex; flex-wrap: wrap; gap: 10px 28px; padding: 4px 0 12px; }
fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }
legend { padding: 0; margin-bottom: 5px; font-size: 12px; color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 5px; }
.chip {
  font: inherit; font-size: 13px; line-height: 1;
  padding: 7px 12px; border-radius: 999px;
  border: 1px solid var(--rule); background: transparent; color: var(--ink);
  cursor: pointer;
}
.chip:hover { border-color: var(--muted); }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--bg); }

.how { margin: 0 0 8px; color: var(--muted); font-size: 13px; }
.how.error { color: var(--kr); }

/* Heatmap */
.grid-wrap { overflow-x: auto; margin: 0 -20px; padding: 0 20px 6px; }
.grid { border-collapse: separate; border-spacing: 2px; font-family: var(--num); }
.grid th, .grid td { padding: 0; }

.grid .corner { position: sticky; left: 0; z-index: 2; background: var(--bg); min-width: var(--city-w); }
.grid .month {
  text-align: left; font: 600 12px/1 var(--ko); color: var(--ink);
  padding: 0 0 5px 4px; border-left: 1px solid var(--rule);
}
.grid .wk { font: 400 11px/1 var(--num); color: var(--muted); padding-bottom: 3px; min-width: 30px; }
/* Weeks after the timetable change: low-cost fares may not be on sale yet. */
.grid .wk.late { text-decoration: underline dotted var(--muted); text-underline-offset: 3px; }
.grid .mk { height: 15px; font: 700 10px/1 var(--ko); vertical-align: top; }
.kr { color: var(--kr); }
.jp { color: var(--jp); }

.grid .city {
  position: sticky; left: 0; z-index: 1; background: var(--bg);
  text-align: left; white-space: nowrap; padding-right: 10px;
  font: 500 13px/1.1 var(--ko);
}
.grid .city small { margin-left: 4px; font-weight: 400; font-size: 11px; color: var(--muted); }
.grid .city .rt { margin-left: 3px; font-size: 11px; color: var(--muted); text-decoration: none; cursor: help; }
.grid .region th {
  position: sticky; left: 0; text-align: left; padding: 9px 0 2px;
  font: 600 11px/1 var(--ko); color: var(--muted); background: var(--bg);
}

.c {
  display: block; width: 100%; min-width: 30px; height: 26px; padding: 0;
  border: 0; border-radius: 3px;
  font: 400 12px/1 var(--num); cursor: pointer;
}
.c:hover { outline: 1px solid var(--ink); outline-offset: 1px; }
.c[aria-pressed="true"] { outline: 2px solid var(--ink); outline-offset: 1px; font-weight: 700; }
.c:focus-visible, .chip:focus-visible, .day:focus-visible, .links a:focus-visible { outline: 2px solid var(--jp); outline-offset: 2px; }
.l0 { background: var(--l0); color: var(--l0-ink); }
.l1 { background: var(--l1); color: var(--l1-ink); }
.l2 { background: var(--l2); color: var(--l2-ink); }
.l3 { background: var(--l3); color: var(--l3-ink); }
.l4 { background: var(--l4); color: var(--l4-ink); }

.grid td.none { text-align: center; color: var(--faint); font-size: 12px; }
.grid td.unsold, .swatch.unsold {
  border-radius: 3px;
  background: repeating-linear-gradient(135deg, transparent 0 3px, var(--hatch) 3px 4px);
}

/* Legend */
.legend { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 18px; margin: 8px 0 18px; font-size: 12px; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: 5px; }
.swatch { width: 18px; height: 12px; border-radius: 3px; }
.legend b { font-weight: 700; }

/* Detail dock: stays at the bottom of the window while you move around the grid. */
.dock {
  position: sticky; bottom: 0; z-index: 3;
  margin: 0 -20px; padding: 14px 20px 16px;
  background: var(--panel); border-top: 1px solid var(--rule);
  box-shadow: 0 -10px 24px -20px rgb(22 40 58 / 0.55);
  display: grid; gap: 12px 28px;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  grid-template-areas: "head sum" "days sum" "notes links";
  align-items: start;
}
.dock-head { grid-area: head; }
.dock h2 { margin: 0; font-size: 17px; font-weight: 700; letter-spacing: -0.01em; }
.dock h2 small { margin-left: 6px; font-size: 13px; font-weight: 400; color: var(--muted); }
.dock .hol { margin: 3px 0 0; font-size: 12px; color: var(--muted); }

.days { grid-area: days; display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 3px; max-width: 420px; }
.day {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  padding: 6px 0 5px; border: 0; border-radius: 4px;
  font: 400 12px/1 var(--num); cursor: pointer;
}
.day i { font: normal 400 11px/1 var(--ko); opacity: 0.85; }
.day:disabled { background: transparent; color: var(--faint); cursor: default; }
.day[aria-pressed="true"] { outline: 2px solid var(--ink); outline-offset: 1px; font-weight: 700; }

.sum { grid-area: sum; margin: 0; display: grid; grid-template-columns: auto 1fr auto; gap: 5px 14px; align-items: baseline; }
.sum dt { color: var(--muted); font-size: 13px; }
.sum dd { margin: 0; }
.sum .when { font-size: 13px; }
.sum .amt { font-family: var(--num); text-align: right; white-space: nowrap; }
.sum .total { padding-top: 6px; border-top: 1px solid var(--rule); }
.sum .total.amt { font-size: 22px; font-weight: 700; line-height: 1.1; }
.sum .down { color: var(--l0); }
.sum .up { color: var(--l4); }

.notes { grid-area: notes; margin: 0; font-size: 12px; color: var(--muted); }
.notes p { margin: 0 0 3px; }
.links { grid-area: links; display: flex; flex-wrap: wrap; gap: 6px; justify-content: flex-end; }
.links a {
  padding: 8px 13px; border-radius: 6px; border: 1px solid var(--ink);
  color: var(--ink); text-decoration: none; font-size: 13px; line-height: 1;
}
.links a:first-child { background: var(--ink); color: var(--bg); }
.links a:hover { border-color: var(--jp); }

.foot { padding-top: 22px; padding-bottom: 40px; font-size: 12px; color: var(--muted); max-width: 1160px; }
.foot p { margin: 0 0 4px; max-width: 76ch; }

.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

@media (max-width: 760px) {
  :root { --city-w: 86px; }
  .top, main, .foot { padding: 0 14px; }
  .top { padding-top: 16px; padding-bottom: 10px; }
  .mark { font-size: 22px; }
  .controls { gap: 8px 18px; }
  .grid-wrap { margin: 0 -14px; padding: 0 14px 6px; }
  .dock {
    margin: 0 -14px; padding: 12px 14px 14px; gap: 10px;
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "head" "days" "sum" "links" "notes";
    max-height: 62dvh; overflow-y: auto;
  }
  .links { justify-content: flex-start; }
  .sum .total.amt { font-size: 20px; }
}

@media (prefers-reduced-motion: no-preference) {
  .c, .chip, .day { transition: outline-color 0.08s; }
}