/* ==========================================================================
   Sentinel Wiki — 토큰 · 기본 · 전역 shell
   규범: docs/design.md §6 §7 §8 §14 §17
   외부 폰트/이미지/스크립트 요청 0건. 웹폰트 선언 없음.
   ========================================================================== */

:root {
  color-scheme: only light;

  /* §6 색 */
  --desk: #e8eef4;
  --paper: #fafcfd;
  --sheet: #f1f5f9;
  --ink: #121820;
  --ink-soft: #3d4a58;
  --mute: #566575;
  --rule: #b8c5d2;
  --rule-firm: #8fa3b8;
  --navy: #1b2a4a;
  --navy-hot: #243a66;
  --signal: #9f4f00;
  --up: #b91c1c;
  --down: #1d4ed8;
  --flat: #566575;
  --ok: #0f766e;
  --danger: #991b1b;
  --warn-bg: #fff4e5;
  --err-bg: #fef1f1;

  /* §7 서체 — 로컬 설치 폰트 우선, 없으면 시스템. 네트워크 요청 없음 */
  --font-display: "IBM Plex Sans KR", "Apple SD Gothic Neo", "Pretendard",
    "Noto Sans KR", "Malgun Gothic", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo,
    "Noto Sans KR", monospace;

  --fs-micro: 0.8125rem;
  --fs-meta: 1rem;
  --fs-body: 1.0625rem;
  --fs-lede: 1.1875rem;
  --fs-h4: 1.125rem;
  --fs-h3: 1.3125rem;
  --fs-h2: clamp(1.375rem, 1.2rem + 0.6vw, 1.625rem);
  --fs-h1: clamp(1.75rem, 1.35rem + 1.7vw, 2.5rem);
  --fs-display: clamp(2.125rem, 1.5rem + 2.6vw, 3.25rem);
  --fs-num: 1.3125rem;
  --fs-num-lg: clamp(1.625rem, 1.4rem + 1vw, 2.125rem);

  /* §8 간격 */
  --shell-max: 1400px;
  --rail-nav: 240px;
  --rail-ctx: 288px;
  --reading-max: 760px;
  --gap-rail: 32px;
  --pad-x: clamp(16px, 3vw, 32px);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  --shadow-flat: 4px 4px 0 rgba(27, 42, 74, 0.06);
  --dur-fast: 120ms;
  --dur-base: 240ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-display);
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--desk);
  background-image:
    linear-gradient(180deg, rgba(197, 210, 223, 0.55) 0%, transparent 320px),
    repeating-linear-gradient(
      -12deg,
      transparent,
      transparent 11px,
      rgba(27, 42, 74, 0.022) 11px,
      rgba(27, 42, 74, 0.022) 12px
    );
  background-attachment: fixed;
  overflow-wrap: break-word;
}

@media (pointer: coarse) {
  body {
    background-attachment: scroll;
  }
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--navy);
}

h1 {
  font-size: var(--fs-h1);
  letter-spacing: -0.035em;
}
h2 {
  font-size: var(--fs-h2);
}
h3 {
  font-size: var(--fs-h3);
}
h4 {
  font-size: var(--fs-h4);
}

p {
  margin: 0 0 var(--space-4);
}

ul,
ol {
  margin: 0 0 var(--space-4);
  padding-left: 1.35em;
}

li {
  margin-bottom: var(--space-2);
}

a {
  color: var(--navy);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--navy-hot);
  text-decoration-thickness: 2px;
}

code,
.mono,
time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* §14 focus — 색 변화만으로 대체 금지 */
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--navy);
  outline-offset: 3px;
  border-radius: 0;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  min-height: 44px;
  background: var(--navy);
  color: var(--paper);
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus-visible {
  left: var(--space-2);
  top: var(--space-2);
  outline-color: var(--signal);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ── 최상단 재단선 ───────────────────────────────────────────────────────── */

.shell-top {
  height: 3px;
  background: var(--navy);
}

/* ── 전역 header (Relume topbar2 3영역 그리드 번안) ──────────────────────── */

.site-head {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.site-head__inner {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: var(--space-3) var(--pad-x);
  display: grid;
  grid-template-columns: minmax(0, 1fr) max-content;
  align-items: center;
  gap: var(--space-3);
}

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
  min-height: 44px;
  justify-content: center;
}

.brand__name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--navy);
  line-height: 1.2;
}

.brand__mark {
  font-size: var(--fs-meta);
  color: var(--mute);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.head-search {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) max-content;
  border: 2px solid var(--rule-firm);
  background: var(--paper);
}

.head-search:focus-within {
  border-color: var(--navy);
}

.head-search[data-collapsed="true"] {
  display: none;
}

.head-search__input {
  min-width: 0;
  min-height: 44px;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-display);
  font-size: var(--fs-body);
  color: var(--ink);
  background: transparent;
  border: 0;
}

.head-search__input::placeholder {
  color: var(--mute);
}

.head-search__input:focus-visible {
  outline-offset: -3px;
}

.head-search__submit {
  min-height: 44px;
  padding-inline: var(--space-4);
  border: 0;
  border-left: 1px solid var(--rule);
  background: var(--sheet);
  color: var(--navy);
  font-family: inherit;
  font-size: var(--fs-meta);
  font-weight: 700;
  cursor: pointer;
}

.head-search__submit:hover {
  background: var(--desk);
}

.head-search__hint {
  display: none;
}

.head-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-btn {
  min-width: 44px;
  min-height: 44px;
  padding: var(--space-2);
  border: 1px solid var(--rule-firm);
  background: var(--paper);
  color: var(--navy);
  font-family: inherit;
  font-size: var(--fs-meta);
  font-weight: 700;
  cursor: pointer;
}

.icon-btn:hover {
  background: var(--sheet);
}

.icon-btn[aria-expanded="true"] {
  background: var(--navy);
  color: var(--paper);
}

.site-nav {
  border-top: 1px solid var(--rule);
  background: var(--sheet);
}

.site-nav__list {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 0 var(--pad-x);
  list-style: none;
  display: flex;
  gap: var(--space-5);
  overflow-x: auto;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: var(--fs-meta);
  font-weight: 600;
  color: var(--navy);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}

.site-nav__link:hover {
  border-bottom-color: var(--rule-firm);
}

.site-nav__link[aria-current="page"] {
  border-bottom-color: var(--navy);
}

.acct {
  display: flex;
  gap: var(--space-2);
  margin-left: auto;
  padding-left: var(--space-4);
}

.acct__btn {
  min-height: 44px;
  padding-inline: var(--space-3);
  border: 1px dashed var(--signal);
  background: transparent;
  color: var(--signal);
  font-family: inherit;
  font-size: var(--fs-meta);
  white-space: nowrap;
}

.acct__btn[disabled] {
  opacity: 0.75;
  cursor: not-allowed;
}

/* ── shell 그리드 ───────────────────────────────────────────────────────── */

.shell {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: var(--space-5) var(--pad-x) var(--space-8);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-5);
}

/* ── 좌측 지식 탐색 rail ─────────────────────────────────────────────────── */

.nav-rail {
  min-width: 0;
}

.nav-rail__group + .nav-rail__group {
  margin-top: var(--space-5);
}

.rail-title {
  margin: 0 0 var(--space-2);
  font-size: var(--fs-meta);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--navy);
  padding-bottom: var(--space-1);
  border-bottom: 2px solid var(--navy);
}

.nav-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-rail__link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: var(--space-1) var(--space-3);
  border-left: 3px solid transparent;
  font-size: var(--fs-meta);
  color: var(--ink-soft);
  text-decoration: none;
}

.nav-rail__link:hover {
  border-left-color: var(--rule-firm);
  background: var(--sheet);
  color: var(--navy);
}

.nav-rail__link[aria-current="page"] {
  border-left-color: var(--navy);
  background: var(--sheet);
  color: var(--navy);
  font-weight: 700;
}

/* 모바일 drawer */
.nav-rail[data-drawer="closed"] {
  display: none;
}

.nav-rail[data-drawer="open"] {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 60;
  width: min(84vw, 320px);
  padding: var(--space-5) var(--space-4) var(--space-8);
  overflow-y: auto;
  background: var(--paper);
  border-right: 2px solid var(--navy);
  box-shadow: var(--shadow-flat);
}

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(18, 24, 32, 0.42);
  border: 0;
  cursor: pointer;
}

.nav-scrim[hidden] {
  display: none;
}

.nav-rail__close {
  display: block;
  width: 100%;
  min-height: 44px;
  margin-bottom: var(--space-4);
  border: 2px solid var(--navy);
  background: transparent;
  color: var(--navy);
  font-family: inherit;
  font-size: var(--fs-meta);
  font-weight: 700;
  cursor: pointer;
}

/* ── main ───────────────────────────────────────────────────────────────── */

.main {
  min-width: 0;
  animation: fade-rise var(--dur-base) var(--ease-out) both;
}

.main:focus {
  outline: none;
}

.main:focus-visible {
  outline: 3px solid var(--navy);
  outline-offset: 6px;
}

@keyframes fade-rise {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ── footer ─────────────────────────────────────────────────────────────── */

.site-foot {
  border-top: 1px solid var(--rule);
  background: var(--sheet);
}

.site-foot__inner {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: var(--space-6) var(--pad-x) var(--space-7);
  display: grid;
  gap: var(--space-6);
}

.site-foot__cols {
  display: grid;
  gap: var(--space-5);
}

.foot-ident__name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--navy);
}

.foot-ident__note {
  margin: var(--space-2) 0 0;
  max-width: 42ch;
  font-size: var(--fs-meta);
  color: var(--mute);
}

.foot-col__title {
  margin: 0 0 var(--space-2);
  font-size: var(--fs-meta);
  font-weight: 700;
  color: var(--navy);
}

.foot-col__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.foot-col__list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: var(--fs-meta);
}

.site-foot__rule {
  height: 1px;
  background: var(--rule);
}

.site-foot__bottom {
  display: grid;
  gap: var(--space-3);
  font-size: var(--fs-meta);
  color: var(--mute);
}

.site-foot__bottom p {
  margin: 0;
}

/* ── 반응형 ─────────────────────────────────────────────────────────────── */

@media (min-width: 768px) {
  .site-head__inner {
    grid-template-columns: max-content minmax(0, 1fr) max-content;
    gap: var(--space-5);
  }

  .head-search {
    grid-column: auto;
    max-width: 520px;
    justify-self: stretch;
  }

  .head-search[data-collapsed="true"] {
    display: grid;
  }

  .head-search__hint {
    display: flex;
    align-items: center;
    padding-inline: var(--space-3);
    border-left: 1px solid var(--rule);
    background: var(--sheet);
    color: var(--mute);
    font-family: var(--font-mono);
    font-size: var(--fs-meta);
  }

  .head-search {
    grid-template-columns: minmax(0, 1fr) max-content max-content;
  }

  .icon-btn--search,
  .icon-btn--menu {
    display: none;
  }

  .shell {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: var(--gap-rail);
    padding-top: var(--space-6);
  }

  .nav-rail[data-drawer="closed"],
  .nav-rail[data-drawer="open"] {
    display: block;
    position: sticky;
    top: 132px;
    inset: auto;
    width: auto;
    max-height: calc(100vh - 156px);
    overflow-y: auto;
    padding: 0;
    background: transparent;
    border-right: 0;
    box-shadow: none;
  }

  .nav-rail__close,
  .nav-scrim {
    display: none;
  }

  .site-foot__cols {
    grid-template-columns: minmax(0, 1fr) max-content max-content;
    gap: var(--space-7);
  }

  .site-foot__bottom {
    grid-template-columns: minmax(0, 1fr) max-content;
    align-items: center;
  }
}

@media (min-width: 1180px) {
  .shell {
    grid-template-columns: var(--rail-nav) minmax(0, 1fr);
  }
}

/* ── 200% 확대·감소 모션·인쇄 ────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

@media (prefers-contrast: more) {
  .nav-rail__link,
  .site-nav__link {
    color: var(--ink);
  }

  .badge {
    border-width: 2px;
  }
}

@media (forced-colors: active) {
  .badge,
  .btn,
  .stat-cell,
  .head-search {
    border: 1px solid CanvasText;
  }
}

@media print {
  .site-head,
  .nav-rail,
  .skip-link,
  .nav-scrim,
  .ctx-rail {
    display: none !important;
  }

  body {
    background: #fff;
  }

  .shell {
    display: block;
    padding: 0;
  }
}