/* ── Font ── */
@font-face {
  font-family: 'Line Seed KR';
  src: url('fonts/LINESeedKR-Rg.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* ── Tokens (앱 다크 테마와 동일) ── */
:root {
  --bg-deep:    #0a0a0a;
  --bg-card:    #1a1d1b;

  --green-dim:  #5c6b62;
  --green-mid:  #7fa88e;
  --green-soft: #8ca892;

  --text-primary:   #edefec;
  --text-secondary: #90a198;

  --border-subtle: rgba(255, 255, 255, 0.05);
  --border-faint:  rgba(255, 255, 255, 0.04);

  --maxw: 44rem;
}

/* ── Base ── */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: 'Line Seed KR', -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo',
    'Malgun Gothic', sans-serif;
  font-size: 1rem;
  line-height: 1.75;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

a {
  color: var(--green-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(140, 168, 146, 0.3);
  transition: color 0.15s ease, border-color 0.15s ease;
}

a:hover {
  color: var(--green-mid);
  border-bottom-color: var(--green-mid);
}

a:focus-visible,
:focus-visible {
  outline: 2px solid var(--green-mid);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ── Header ── */
.site-header {
  border-bottom: 1px solid var(--border-subtle);
}

.site-header__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 1.5rem;
}

.site-logo {
  display: block;
  width: 56px;
  height: 56px;
  margin: 0 0 0.85rem;
  border-radius: 13px;
  border: 1px solid var(--border-subtle);
}

.site-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.site-title a {
  color: var(--text-primary);
  border-bottom: none;
}

.site-tagline {
  margin: 0.35rem 0 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* ── Nav ── */
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.site-nav a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-bottom: 1px solid transparent;
  padding-bottom: 0.15rem;
}

.site-nav a:hover {
  color: var(--text-primary);
  border-bottom-color: var(--border-subtle);
}

.site-nav a[aria-current='page'] {
  color: var(--green-soft);
  border-bottom-color: var(--green-soft);
}

/* ── Layout ── */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.page-title {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.page-meta {
  margin: 0 0 2.5rem;
  color: var(--green-dim);
  font-size: 0.8125rem;
}

.lead {
  margin: 0 0 2.5rem;
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.8;
}

section {
  margin-bottom: 2.75rem;
}

h2 {
  margin: 0 0 1rem;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--green-soft);
  letter-spacing: -0.01em;
}

h3 {
  margin: 0 0 0.75rem;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
}

p {
  margin: 0 0 1rem;
  color: var(--text-secondary);
}

p:last-child {
  margin-bottom: 0;
}

ul {
  margin: 0 0 1rem;
  padding-left: 1.125rem;
  color: var(--text-secondary);
}

li {
  margin-bottom: 0.4rem;
}

li:last-child {
  margin-bottom: 0;
}

/* ── Card ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-faint);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.card:last-child {
  margin-bottom: 0;
}

/* ── FAQ ── */
.faq {
  border-top: 1px solid var(--border-subtle);
}

.faq details {
  border-bottom: 1px solid var(--border-subtle);
}

.faq summary {
  padding: 1.125rem 2rem 1.125rem 0;
  cursor: pointer;
  position: relative;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: '+';
  position: absolute;
  right: 0.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--green-dim);
  font-size: 1.125rem;
  line-height: 1;
}

.faq details[open] summary::after {
  content: '−';
}

.faq summary:hover {
  color: var(--green-soft);
}

.faq .faq-answer {
  padding: 0 0 1.25rem;
}

/* ── Feature list ── */
.features {
  list-style: none;
  padding: 0;
  margin: 0;
}

.features li {
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--border-faint);
}

.features li:last-child {
  border-bottom: none;
}

.features strong {
  display: block;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 0.9375rem;
  margin-bottom: 0.15rem;
}

/* ── Definition table (앱 정보) ── */
.info-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.info-table th,
.info-table td {
  text-align: left;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-faint);
  vertical-align: top;
}

.info-table tr:last-child th,
.info-table tr:last-child td {
  border-bottom: none;
}

.info-table th {
  width: 9rem;
  font-weight: 400;
  color: var(--green-dim);
}

.info-table td {
  color: var(--text-secondary);
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--border-subtle);
}

.site-footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  color: var(--green-dim);
  font-size: 0.8125rem;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-bottom: 1rem;
}

.site-footer__links a {
  color: var(--text-secondary);
  border-bottom: none;
}

.site-footer__links a:hover {
  color: var(--green-soft);
}

/* ── Small screens ── */
@media (max-width: 30rem) {
  .page-title {
    font-size: 1.5rem;
  }

  .info-table th {
    width: 7rem;
  }
}