:root {
  color: #132037;
  background: #f5f3ec;
  font-family:
    ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
    "Noto Sans KR", "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  --ink: #07152f;
  --blue: #145f9f;
  --teal: #1f918c;
  --gold: #b7781f;
  --paper: #fffdf7;
  --line: rgba(7, 21, 47, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background: #f5f3ec;
}

a {
  color: inherit;
  text-decoration: none;
}

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

h1,
h2,
p {
  margin: 0;
}

h1,
h2 {
  color: var(--ink);
  letter-spacing: 0;
  line-height: 1.12;
}

.hero {
  position: relative;
  display: grid;
  min-height: 88svh;
  overflow: hidden;
  color: #ffffff;
  background: var(--ink);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(4, 13, 31, 0.92), rgba(4, 13, 31, 0.7) 42%, rgba(4, 13, 31, 0.26)),
    url("assets/mesbook-cover.jpg") center right 20% / cover no-repeat;
}

.topbar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 22px 0;
}

.brand {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 900;
}

.topbar div {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
}

.topbar a:not(.brand) {
  color: rgba(255, 255, 255, 0.84);
  font-size: 0.92rem;
  font-weight: 800;
}

.hero-content {
  position: relative;
  z-index: 1;
  align-self: end;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 0 0 12svh;
}

.eyebrow {
  margin-bottom: 12px;
  color: var(--gold);
  font-size: 0.85rem;
  font-weight: 950;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 760px;
  color: #ffffff;
  font-size: clamp(2.55rem, 8vw, 5.9rem);
  word-break: keep-all;
}

.subtitle {
  margin-top: 18px;
  color: #d7ecff;
  font-size: clamp(1.1rem, 2.4vw, 1.65rem);
  font-weight: 800;
}

.lead {
  max-width: 620px;
  margin-top: 24px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 1.05rem;
  line-height: 1.75;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.primary,
.secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 900;
}

.primary {
  color: #07152f;
  background: #ffffff;
}

.secondary {
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.42);
}

.info-band,
.license-band {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 76px 0;
}

.info-band {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 56px;
  align-items: center;
}

.book-cover img {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 26px 70px rgba(7, 21, 47, 0.24);
}

.book-info h2,
.license-band h2 {
  font-size: clamp(2rem, 4vw, 3.35rem);
  word-break: keep-all;
}

.book-info p,
.license-band p {
  max-width: 760px;
  margin-top: 22px;
  color: #3c4a61;
  font-size: 1rem;
  line-height: 1.8;
}

dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 30px 0 0;
}

dl div {
  min-height: 92px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

dt {
  color: var(--blue);
  font-size: 0.83rem;
  font-weight: 950;
}

dd {
  margin: 9px 0 0;
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 850;
}

.license-band {
  border-top: 1px solid var(--line);
}

.license-band ul {
  display: grid;
  gap: 10px;
  max-width: 840px;
  margin: 28px 0 0;
  padding-left: 20px;
  color: #2f3e56;
  line-height: 1.75;
}

footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 30px 0 42px;
  border-top: 1px solid var(--line);
  color: #58677f;
  font-size: 0.92rem;
  font-weight: 700;
}

@media (max-width: 760px) {
  .hero {
    min-height: 92svh;
  }

  .hero-bg {
    background:
      linear-gradient(180deg, rgba(4, 13, 31, 0.7), rgba(4, 13, 31, 0.93) 56%, rgba(4, 13, 31, 0.98)),
      url("assets/mesbook-cover.jpg") top center / cover no-repeat;
  }

  .topbar {
    align-items: flex-start;
  }

  .topbar div {
    display: none;
  }

  .hero-content {
    padding-bottom: 8svh;
  }

  .lead {
    font-size: 0.98rem;
  }

  .actions a {
    width: 100%;
  }

  .info-band {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 54px 0;
  }

  .book-cover {
    max-width: 280px;
  }

  dl {
    grid-template-columns: 1fr;
  }

  .license-band {
    padding: 54px 0;
  }
}