* {
  box-sizing: border-box;
}

:root {
  color-scheme: light;
  --bg: #f5f1e8;
  --surface: rgba(255, 252, 247, 0.9);
  --line: rgba(28, 33, 37, 0.12);
  --text: #182126;
  --muted: #5e6a6f;
  --accent: #14706d;
  --accent-soft: rgba(20, 112, 109, 0.1);
  --shadow: 0 20px 60px rgba(24, 33, 38, 0.08);
}

html {
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(20, 112, 109, 0.12), transparent 34%),
    radial-gradient(circle at top right, rgba(218, 165, 32, 0.16), transparent 26%),
    linear-gradient(180deg, #f8f5ee 0%, var(--bg) 100%);
}

body {
  margin: 0;
  font-family: "Pretendard", "Noto Sans KR", sans-serif;
  color: var(--text);
  line-height: 1.7;
}

a {
  color: inherit;
}

.page {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.hero {
  margin-bottom: 28px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.hero h1 {
  margin: 18px 0 10px;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.08;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  margin: 24px 0 34px;
}

.nav a,
.back-link {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.nav a:hover,
.back-link:hover {
  transform: translateY(-2px);
  border-color: rgba(20, 112, 109, 0.34);
  background: rgba(255, 255, 255, 0.92);
}

.nav strong {
  display: block;
  margin-bottom: 6px;
  font-size: 17px;
}

.nav span {
  color: var(--muted);
  font-size: 14px;
}

.card {
  padding: 30px 28px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.doc-header {
  margin-bottom: 24px;
}

.doc-header h1 {
  margin: 14px 0 8px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.1;
}

.doc-header p {
  margin: 0;
  color: var(--muted);
}

.doc p,
.doc ul {
  margin: 0 0 16px;
}

.doc ul {
  padding-left: 20px;
}

.doc h2 {
  margin: 28px 0 10px;
  font-size: 22px;
  line-height: 1.3;
}

.doc strong {
  font-weight: 700;
}

.footer {
  margin-top: 20px;
  color: var(--muted);
  font-size: 14px;
}

.invite-page {
  width: min(560px, calc(100% - 24px));
  min-height: 100vh;
  display: grid;
  align-content: center;
}

.invite-hero {
  margin-bottom: 18px;
  text-align: center;
}

.invite-hero h1 {
  margin: 16px 0 10px;
  font-size: clamp(30px, 8vw, 44px);
  line-height: 1.12;
}

.invite-hero p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.invite-card {
  padding: 28px 24px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
  text-align: center;
}

.invite-code-label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.invite-code {
  margin: 12px 0 10px;
  font-size: clamp(32px, 10vw, 52px);
  line-height: 1;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.invite-copy {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.invite-actions {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.invite-primary,
.invite-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 17px;
  font-weight: 700;
}

.invite-primary {
  background: #186cdb;
  color: #fff;
}

.invite-secondary {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
}

.invite-help {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 640px) {
  .page {
    width: min(100% - 20px, 920px);
    padding: 20px 0 40px;
  }

  .hero,
  .card,
  .nav a,
  .back-link {
    border-radius: 20px;
  }

  .hero,
  .card {
    padding: 24px 18px;
  }

  .invite-card {
    border-radius: 24px;
    padding: 24px 18px;
  }
}