/* Base layout & components — XKCD edition. Everything is ink on paper (or
   chalk on board). Boxes get the classic uneven-radius hand-drawn border.
   Logical properties throughout so RTL locales mirror automatically. */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.55;
  font-size: clamp(1.05rem, 1rem + 0.3vw, 1.3rem); /* handwriting reads smaller; scale up */
}
img, svg { max-width: 100%; }
a { color: var(--link); text-decoration-style: wavy; text-decoration-thickness: 1px; text-underline-offset: 4px; }
a:hover { text-decoration-style: solid; text-decoration-thickness: 2px; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.2; text-wrap: balance; font-weight: 400; }
h1 { font-size: clamp(2rem, 1.5rem + 2.4vw, 3.6rem); }
h2 { font-size: clamp(1.45rem, 1.2rem + 1vw, 2.2rem); }
h3 { font-size: clamp(1.2rem, 1.05rem + 0.5vw, 1.6rem); }
:focus-visible { outline: var(--stroke) dashed var(--focus); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: absolute; inset-block-start: -3.5rem; inset-inline-start: 1rem;
  background: var(--bg); color: var(--text); border: var(--stroke) solid var(--ink);
  border-radius: var(--wobble-2);
  padding: 0.5rem 1rem; z-index: 100; transition: inset-block-start 0.15s;
}
.skip-link:focus { inset-block-start: 0.4rem; }

/* ---------- header / navbar ---------- */
.site-header {
  border-block-end: var(--stroke) solid var(--ink);
  background: var(--bg);
  position: sticky; inset-block-start: 0; z-index: 50;
}
.navbar {
  max-width: var(--maxw); margin-inline: auto; padding: 0.55rem 1rem;
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 0.55rem; text-decoration: none; color: var(--text); }
.brand-name { font-family: var(--font-display); font-size: 1.35rem; letter-spacing: 0.02em; }
.nav-links {
  display: flex; gap: 0.15rem; list-style: none; margin: 0; padding: 0;
  margin-inline-start: auto; flex-wrap: wrap;
}
.nav-links a {
  display: block; padding: 0.4rem 0.55rem; border-radius: 8px;
  color: var(--text-dim); text-decoration: none; font-size: 1rem;
  white-space: nowrap;
  border: var(--stroke) solid transparent;
}
.nav-links a:hover { color: var(--text); border-color: var(--line); border-radius: var(--wobble-2); }
/* the tuned-in station: circled by hand, like an answer on a worksheet */
.nav-links a[aria-current="page"] {
  color: var(--text);
  border: var(--stroke) solid var(--accent);
  border-radius: var(--wobble);
}
.nav-tools { display: flex; align-items: center; gap: 0.4rem; }
.nav-toggle { display: none; }
.nav-toggle-btn { display: none; }

.theme-toggle {
  background: var(--bg); color: var(--text); border: var(--stroke) solid var(--ink);
  border-radius: 50% 45% 55% 48% / 48% 55% 45% 52%;
  inline-size: 2.5rem; block-size: 2.5rem;
  display: grid; place-items: center; cursor: pointer;
}
:root[data-theme="dark"] .icon-moon { display: none; }
:root:not([data-theme="dark"]) .icon-sun { display: none; }

.locale-switcher { position: relative; }
.locale-switcher summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; gap: 0.4rem;
  background: var(--bg); border: var(--stroke) solid var(--ink);
  border-radius: var(--wobble-2);
  padding: 0.4rem 0.8rem; font-size: 1rem;
  white-space: nowrap;
}
.locale-flag { font-size: 1.05rem; line-height: 1; }
.locale-switcher summary::-webkit-details-marker { display: none; }
.locale-menu {
  position: absolute; inset-inline-end: 0; inset-block-start: calc(100% + 6px);
  background: var(--bg); border: var(--stroke) solid var(--ink); border-radius: 14px;
  list-style: none; margin: 0; padding: 0.4rem; inline-size: max-content;
  max-block-size: 60vh; overflow-y: auto; z-index: 60;
  box-shadow: 4px 4px 0 var(--accent-soft);
}
.locale-menu a { display: block; padding: 0.35rem 0.7rem; border-radius: 8px; text-decoration: none; color: var(--text); white-space: nowrap; }
.locale-menu a:hover { background: var(--accent-soft); }
.locale-menu a[aria-current="true"] { color: var(--accent); }

@media (max-width: 960px) {
  .nav-toggle-btn {
    display: flex; flex-direction: column; gap: 5px; cursor: pointer;
    padding: 0.6rem; margin-inline-start: auto; order: 2;
  }
  .nav-toggle-btn span { display: block; inline-size: 22px; block-size: 2.5px; background: var(--text); border-radius: 2px; transform: rotate(-1deg); }
  .nav-toggle-btn span:nth-child(2) { transform: rotate(1.5deg); }
  .nav-tools { order: 3; }
  .nav-links { order: 4; display: none; flex-basis: 100%; flex-direction: column; padding-block: 0.5rem; }
  .nav-toggle:checked ~ .nav-links { display: flex; }
}

/* ---------- page scaffolding ---------- */
main { max-width: var(--maxw); margin-inline: auto; padding: 1.5rem 1rem 4rem; }
.prose { max-width: 46rem; }
.section { margin-block: 2.5rem; }
.answer-lead { font-size: 1.1em; }
.kicker {
  font-family: var(--font-display); font-size: 0.95rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--text-dim);
}

.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: 1.1rem; padding: 0; list-style: none; }
.card {
  background: var(--bg); border: var(--stroke) solid var(--ink);
  border-radius: var(--wobble);
  padding: 1.1rem 1.2rem; display: block; text-decoration: none; color: var(--text);
  transition: transform 0.15s, box-shadow 0.15s;
}
.card:nth-child(even) { border-radius: var(--wobble-2); }
.card:hover { transform: translateY(-2px) rotate(-0.4deg); box-shadow: 4px 5px 0 var(--accent-soft); }
.card .card-num { font-family: var(--font-display); color: var(--text-dim); font-size: 0.95rem; }
.card h3 { margin: 0.2rem 0 0.3rem; }
.card p { margin: 0; color: var(--text-dim); font-size: 1rem; }
.card .jp { color: var(--text-dim); font-size: 0.9rem; }

.faq-item { border-block-end: var(--stroke) solid var(--line); padding-block: 1rem; }
.faq-item h2, .faq-item h3 { margin-block: 0 0.4rem; }
.faq-item p { margin-block: 0; color: var(--text-dim); }

.breadcrumbs { font-size: 0.95rem; color: var(--text-dim); margin-block-end: 1rem; }
.breadcrumbs a { color: var(--text-dim); }
.breadcrumbs [aria-current] { color: var(--text); }

.pager { display: flex; justify-content: space-between; gap: 1rem; margin-block-start: 2.5rem; flex-wrap: wrap; }

.notice {
  border: var(--stroke) dashed var(--ink); border-radius: var(--wobble-2);
  padding: 1rem 1.2rem; color: var(--text-dim); font-size: 1rem;
}
.notice strong { color: var(--text); }

/* ---------- footer (kept short: two lines on desktop) ---------- */
.site-footer { border-block-start: var(--stroke) solid var(--ink); background: var(--bg-deep); }
.footer-inner { max-width: var(--maxw); margin-inline: auto; padding: 0.8rem 1rem 0.9rem; color: var(--text-dim); font-size: 0.9rem; }
.footer-about { margin-block: 0 0.35rem; }
.footer-row {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 1rem; flex-wrap: wrap;
}
.footer-row p { margin-block: 0; }
.footer-sign { font-family: var(--font-display); color: var(--text); margin-inline-start: auto; }
.footer-sun { color: #f5a623; } /* the sun is yellow-orange, obviously */
.footer-legal { font-size: 0.9rem; }
.mt-note { font-style: italic; }

/* ---------- stamp card ---------- */
.stamp-summary { display: flex; gap: 1rem; flex-wrap: wrap; margin-block: 1.5rem; }
.stat {
  background: var(--bg); border: var(--stroke) solid var(--ink); border-radius: var(--wobble);
  padding: 0.9rem 1.4rem; min-inline-size: 8rem;
}
.stat:nth-child(even) { border-radius: var(--wobble-2); }
.stat .num { font-family: var(--font-display); font-size: 2.4rem; color: var(--accent); display: block; line-height: 1.1; }
.stat .lbl { color: var(--text-dim); font-size: 0.95rem; }
.stamp-grid {
  display: grid; grid-template-columns: repeat(7, minmax(2.2rem, 3.4rem)); gap: 0.5rem;
  margin-block: 1.5rem; padding: 1.2rem; background: var(--bg);
  border: var(--stroke) solid var(--ink); border-radius: var(--wobble);
  inline-size: fit-content;
}
.stamp-cell {
  aspect-ratio: 1; border: 1.5px dashed var(--line);
  border-radius: 48% 52% 55% 45% / 52% 48% 45% 55%;
  display: grid; place-items: center; font-size: 0.8rem; color: var(--text-dim);
  position: relative;
}
.stamp-cell.stamped { border-style: solid; border-color: var(--stamp); border-width: var(--stroke); }
/* the mark says which routine: 一 = No. 1, 二 = No. 2, 済 = both */
.stamp-cell.stamped::after {
  content: attr(data-mark); position: absolute; inset: 0; display: grid; place-items: center;
  color: var(--stamp); font-family: var(--font-display);
  font-size: 1.3rem; transform: rotate(-12deg);
}
.stamp-legend { color: var(--text-dim); font-size: 0.95rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--btn-bg); color: #fff; border: var(--stroke) solid var(--btn-bg); cursor: pointer;
  font-family: var(--font-display); font-size: 1.15rem;
  padding: 0.55rem 1.3rem; border-radius: var(--wobble);
  text-decoration: none;
}
.btn:hover { filter: brightness(1.08); transform: rotate(-0.5deg); }
.btn.secondary { background: var(--bg); color: var(--text); border-color: var(--ink); border-radius: var(--wobble-2); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .card, .btn { transition: none; }
  .card:hover, .btn:hover { transform: none; }
}

/* ---------- contact form (About page) ---------- */
.contact-form textarea, .contact-form input[type="email"], .contact-form input[type="text"] {
  inline-size: 100%; max-inline-size: 34rem;
  background: var(--bg); color: var(--text);
  border: var(--stroke) solid var(--ink); border-radius: 10px;
  padding: 0.55rem 0.7rem; font-family: var(--font-body); font-size: 1rem;
}
.contact-form label { color: var(--text-dim); font-size: 0.95rem; }
.contact-form .hp-wrap { position: absolute; inset-inline-start: -9999px; block-size: 0; overflow: hidden; }
#cf-status { margin-inline-start: 0.6rem; color: var(--text-dim); }