/* ==========================================================================
   기차와 철도 배움터 — 전역 리셋 / 타이포그래피 (Toss 계층 기준)
   ========================================================================== */

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--c-bg);
  color: var(--c-ink);
  font-size: 16px;
  line-height: 1.5;
}

h1, h2, h3, .title-font {
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.35;
  margin: 0 0 .55em;
  letter-spacing: -.01em;
}

h1 { font-size: 1.75rem; }   /* 28px — Toss Display Large */
h2 { font-size: 1.375rem; }  /* 22px — Toss Heading Large */
h3 { font-size: 1.125rem; font-weight: 600; } /* 18px — Toss Heading */
p { margin: 0 0 1em; color: var(--c-ink); }

a { color: var(--c-primary); text-decoration: none; }
img, svg { max-width: 100%; display: block; }
button { font-family: var(--font-sans); cursor: pointer; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}