@font-face {
  font-family: "XinChao Noto Sans KR";
  src: url("/fonts/NotoSansKR-VF.ttf") format("truetype");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

:root {
  color-scheme: light;
  --canvas: #f3f5f8;
  --surface: #ffffff;
  --text: #172033;
  --text-soft: #667085;
  --blue: #2b5bd7;
  --ink: #343941;
  --line: #d8dee8;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  min-height: 100%;
  background: var(--canvas);
}

body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  color: var(--text);
  background: var(--canvas);
  font-family: "XinChao Noto Sans KR", "Noto Sans KR", "Malgun Gothic", "Apple SD Gothic Neo", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

h1,
h2,
p {
  margin: 0;
  overflow-wrap: anywhere;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 12px;
  left: 12px;
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 16px;
  border-radius: var(--radius);
  color: var(--surface);
  background: var(--ink);
  font-weight: 700;
  transform: translateY(calc(-100% - 24px));
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.site-header__inner {
  display: flex;
  width: min(calc(100% - 48px), 1120px);
  min-height: 72px;
  margin: 0 auto;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  object-fit: contain;
}

.brand-name {
  color: var(--ink);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.home-main {
  display: grid;
  min-height: calc(100vh - 73px);
  min-height: calc(100dvh - 73px);
  align-items: center;
  padding: 64px 24px 88px;
}

.course-selection {
  width: min(100%, 880px);
  margin: 0 auto;
}

.page-heading {
  margin-bottom: 32px;
  text-align: center;
}

.page-heading h1 {
  font-size: clamp(28px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.025em;
}

.course-list {
  width: min(100%, 560px);
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.course-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.course-card__body {
  display: grid;
  gap: 28px;
  padding: 36px;
}

.course-card h2 {
  color: var(--text);
  font-size: 24px;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.02em;
  text-align: center;
}

.course-card__action {
  display: inline-flex;
  width: 100%;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border: 1px solid var(--blue);
  border-radius: var(--radius);
  color: var(--surface);
  background: var(--blue);
  font-weight: 700;
  line-height: 1.25;
  text-align: center;
  transition: border-color 140ms ease, background-color 140ms ease;
}

.course-card__action:focus-visible,
.skip-link:focus-visible {
  outline: 3px solid var(--text);
  outline-offset: 3px;
}

@media (hover: hover) {
  .course-card__action:hover {
    border-color: var(--ink);
    background: var(--ink);
  }
}

@media (max-width: 600px) {
  .site-header__inner {
    width: calc(100% - 32px);
    min-height: 64px;
    gap: 10px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .brand-name {
    font-size: 18px;
  }

  .home-main {
    min-height: calc(100vh - 65px);
    min-height: calc(100dvh - 65px);
    padding: 40px 16px 56px;
  }

  .page-heading {
    margin-bottom: 24px;
  }

  .page-heading h1 {
    font-size: 24px;
    line-height: 1.4;
  }

  .course-card__body {
    gap: 24px;
    padding: 28px 24px;
  }

  .course-card h2 {
    font-size: 21px;
  }

  .course-card__action {
    min-height: 48px;
    padding-inline: 18px;
  }
}

@media (max-width: 359px) {
  .home-main {
    padding-right: 12px;
    padding-left: 12px;
  }

  .course-card__body {
    padding-right: 20px;
    padding-left: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .course-card__action {
    transition: none;
  }
}