:root {
  color-scheme: light;
  --bg: #f0f4f9;
  --surface: #ffffff;
  --surface-alt: #e8eef7;
  --text: #0f1d2e;
  --muted: #5a6f8a;
  --line: #c8d6e8;
  --accent: #1a5fb4;
  --accent-strong: #144a8f;
  --warning: #b3541e;
  --info: #1a5fb4;
  --danger: #b23b45;
  --shadow: rgba(15, 29, 46, 0.09);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, "Noto Sans KR", sans-serif;
  background: var(--bg);
  color: var(--text);
  letter-spacing: 0;
}

a {
  color: inherit;
}

.site-header,
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 28px;
}

.site-footer {
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  color: #fff;
  background: var(--accent);
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.site-nav a {
  min-height: 36px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  text-decoration: none;
  font-weight: 700;
}

.page-shell {
  width: min(1160px, 100%);
  margin: 0 auto;
  padding: 44px 28px 60px;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.8fr);
  gap: 24px;
  align-items: stretch;
}

.intro-copy,
.ops-panel,
.section-band,
.admin-panel,
.metric-item,
.feature-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 16px 36px var(--shadow);
}

.intro-copy {
  padding: 42px;
}

.ops-panel {
  padding: 18px;
}

.ops-row {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.ops-row:last-child {
  border-bottom: 0;
}

.ops-row span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.ops-row strong {
  min-width: 0;
  overflow-wrap: anywhere;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0 0 14px;
  font-size: 34px;
  line-height: 1.25;
}

h2 {
  margin: 0;
  font-size: 22px;
}

h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  cursor: pointer;
}

.button.primary {
  color: #ffffff;
  border-color: var(--accent);
  background: var(--accent);
}

.button.primary:hover {
  background: var(--accent-strong);
}

.section-band {
  margin-top: 24px;
  padding: 28px;
}

.section-heading {
  margin-bottom: 18px;
}

.feature-grid,
.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.feature-item,
.metric-item {
  padding: 18px;
  box-shadow: none;
}

.feature-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.admin-body {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  min-height: 100vh;
}

.admin-sidebar {
  position: sticky;
  top: 0;
  /* 사이드바를 화면 끝까지 채운 뒤 내부를 flex column 으로 분할:
     상단=브랜드, 가운데=메뉴(스크롤), 하단=관리자명+로그아웃 */
  height: 100vh;
  padding: 18px;
  background: var(--surface);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
}

/* ── 브랜드: 로고 + Admin 라벨, 한 줄 정렬 ── */
.admin-brand {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  margin-bottom: 22px;
  text-decoration: none;
  color: var(--text);
  flex-shrink: 0;
}
.admin-brand-logo  { height: 32px; width: auto; flex-shrink: 0; display: block; }
.admin-brand-label {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-transform: uppercase;
}

.admin-menu {
  display: grid;
  gap: 8px;
  /* 가운데 영역을 늘려 하단 footer 를 사이드바 맨 아래로 밀어낸다 */
  flex: 1 1 auto;
  align-content: start;
  overflow-y: auto;
  overflow-x: hidden;
}

/* ── 사이드바 하단 고정 영역 (관리자명 + 로그아웃) ── */
.admin-sidebar-footer {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 16px;
  margin-top: 16px;
  border-top: 1px solid var(--line);
}
.admin-sidebar-footer .button { width: 100%; }
.admin-me {
  font-size: 13px;
  color: var(--muted);
  text-align: center;
  padding: 4px 6px;
  word-break: break-all;
}
.admin-me strong { color: var(--text); }

.admin-menu-item {
  min-height: 42px;
  padding: 0 12px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.admin-menu-item:hover,
.admin-menu-item.active {
  color: var(--text);
  border-color: var(--line);
  background: var(--surface-alt);
}

.admin-main {
  min-width: 0;
  padding: 26px;
  /* 탭 콘텐츠가 화면 하단까지 채워지도록 main 자체를 flex column 으로 운영 */
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.admin-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.admin-topbar h1 {
  margin-bottom: 0;
  font-size: 28px;
}

.login-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.input {
  min-height: 42px;
  width: 100%;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  font: inherit;
}

textarea.input {
  padding-top: 12px;
  resize: vertical;
}

.login-strip .input {
  width: 160px;
}

.admin-tab {
  display: none;
}

/* 활성화된 탭은 main 의 남은 세로 공간을 모두 차지하도록 flex 로 펼친다.
   덕분에 짧은 콘텐츠도 페이지 하단 빈 영역이 사라지고 패널이 자연스럽게 늘어남. */
.admin-tab.active {
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1 1 auto;
}
.admin-tab.active > .admin-panel,
.admin-tab.active > .admin-grid {
  /* 마지막 자식 패널/그리드가 남은 공간을 채워 사이드바 끝선과 맞춤 */
  flex: 0 0 auto;
}
.admin-tab.active > .admin-panel:last-child,
.admin-tab.active > .admin-grid:last-child {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
}
.admin-tab.active > .admin-panel:last-child > .table-wrap,
.admin-tab.active > .admin-grid:last-child > .admin-panel { flex: 1 1 auto; }

.metric-grid {
  margin-bottom: 16px;
}

.metric-item span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.metric-item strong {
  display: block;
  margin-top: 8px;
  font-size: 30px;
}

.admin-grid.two {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.admin-panel {
  padding: 20px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.table-filter {
  max-width: 260px;
}

.table-wrap {
  overflow-x: auto;
}

.admin-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}

.admin-table th,
.admin-table td {
  padding: 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
  white-space: nowrap;
}

.admin-table th {
  color: var(--muted);
  font-size: 13px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border-radius: 8px;
  border: 1px solid var(--line);
  font-size: 13px;
  font-weight: 800;
}

.badge.pro {
  color: #fff;
  border-color: var(--accent);
  background: var(--accent);
}

.badge.free {
  color: var(--warning);
  border-color: rgba(179, 84, 30, 0.35);
  background: rgba(179, 84, 30, 0.08);
}

.work-list {
  margin: 14px 0 0;
  padding-left: 20px;
  line-height: 1.8;
}

.endpoint-list,
.settings-list,
.form-grid {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.endpoint-list code {
  display: block;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-alt);
  overflow-wrap: anywhere;
}

.admin-feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.settings-list label {
  display: flex;
  gap: 10px;
  align-items: center;
  min-height: 42px;
}

@media (max-width: 920px) {
  .intro-grid,
  .admin-grid.two,
  .feature-grid,
  .metric-grid,
  .admin-feature-grid {
    grid-template-columns: 1fr;
  }

  .admin-body {
    grid-template-columns: 1fr;
  }

  .admin-sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    /* 모바일에서는 사이드바가 화면 위에 가로로 펼쳐지므로 flex column 효과 해제 */
    display: block;
  }

  .admin-menu {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    overflow: visible;
  }

  .admin-sidebar-footer .button { width: 100%; }

  .admin-main {
    /* 모바일에서는 사이드바 위쪽 공간을 빼야 하므로 100vh 강제 해제 */
    min-height: auto;
  }

  .admin-topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .login-strip {
    justify-content: flex-start;
  }
}

@media (max-width: 560px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px;
  }

  .page-shell,
  .admin-main {
    padding: 18px 16px 36px;
  }

  .intro-copy,
  .section-band,
  .admin-panel {
    padding: 20px;
  }

  h1 {
    font-size: 26px;
  }

  .ops-row {
    grid-template-columns: 1fr;
  }

  .admin-menu {
    grid-template-columns: 1fr;
  }

  .login-strip .input {
    width: 100%;
  }
}