/* ============================================================
   PSST-PR 2027 — Base: reset, typography, layout, header/footer
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
/* 오프캔버스 모바일 메뉴(translateX(100%))가 만드는 가로 스크롤 차단 — 루트 overflow-x:hidden(세로 스크롤·sticky 정상) */
html { overflow-x: hidden; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: var(--font-sans);
  font-size: var(--fs-18);
  line-height: 1.7;
  color: var(--ink-900);
  background: var(--navy-050);
  -webkit-font-smoothing: antialiased;
}

img, video, canvas { max-width: 100%; display: block; }
a { color: var(--teal-700); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

h1, h2, h3 { font-family: var(--font-serif); font-weight: 600; line-height: 1.2; color: var(--navy-900); }
h1 { font-size: clamp(var(--fs-39), 5vw, var(--fs-61)); letter-spacing: -0.01em; }
h2 { font-size: clamp(var(--fs-31), 3.6vw, var(--fs-49)); letter-spacing: -0.01em; }
h3 { font-size: clamp(var(--fs-20), 2.2vw, var(--fs-31)); }
h4, h5 { font-family: var(--font-sans); font-weight: 600; letter-spacing: 0.02em; color: var(--navy-900); }
.on-dark h1, .on-dark h2, .on-dark h3 { color: #fff; }

.num, .tabular { font-variant-numeric: tabular-nums; }

/* ---- Focus (전 인터랙티브 요소) ---- */
:focus-visible {
  outline: 2px solid var(--teal-500);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px var(--teal-glow);
  border-radius: 4px;
}
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--navy-900); color: #fff; padding: 12px 20px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ---- Layout ---- */
.container { max-width: var(--content-max); margin-inline: auto; padding-inline: var(--gutter); }
.container--narrow { max-width: 820px; }
.section { padding-block: clamp(72px, 9vw, var(--section-gap)); }
.section--band { background: var(--navy-100); }
.section--dark { background: var(--navy-900); color: var(--navy-200); }
.section--dark p { color: var(--navy-200); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: var(--fs-14); font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--teal-700); margin-bottom: var(--sp-2);
}
.eyebrow::before { content: ""; width: 12px; height: 14px; background: var(--teal-500); clip-path: var(--hex-clip); }
.section--dark .eyebrow { color: var(--teal-300); }
.section-head { margin-bottom: var(--sp-5); max-width: 720px; }
.section-head--wide { max-width: none; } /* 조직위 의견: 제목·설명 한 줄 처리 (데스크톱) */
.section-head p { margin-top: var(--sp-2); color: var(--ink-600); }
.section--dark .section-head p { color: var(--navy-200); }

/* ---- Pore texture (다크 밴드·히어로 전용, opacity 상한 준수) ---- */
.pore-bg { position: relative; isolation: isolate; }
.pore-bg::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    radial-gradient(circle 3px at 8% 22%, rgba(111,204,195,.10) 0 3px, transparent 3px),
    radial-gradient(circle 9px at 23% 64%, rgba(111,204,195,.07) 0 9px, transparent 9px),
    radial-gradient(circle 2px at 36% 30%, rgba(111,204,195,.11) 0 2px, transparent 2px),
    radial-gradient(circle 12px at 52% 78%, rgba(111,204,195,.06) 0 12px, transparent 12px),
    radial-gradient(circle 5px at 64% 18%, rgba(111,204,195,.09) 0 5px, transparent 5px),
    radial-gradient(circle 3px at 78% 52%, rgba(111,204,195,.10) 0 3px, transparent 3px),
    radial-gradient(circle 10px at 90% 80%, rgba(111,204,195,.06) 0 10px, transparent 10px),
    radial-gradient(circle 6px at 94% 28%, rgba(111,204,195,.08) 0 6px, transparent 6px),
    radial-gradient(circle 4px at 15% 88%, rgba(111,204,195,.08) 0 4px, transparent 4px),
    radial-gradient(circle 7px at 43% 8%, rgba(111,204,195,.07) 0 7px, transparent 7px);
}

/* ---- Pore dot divider (섹션 경계 기본형) ---- */
.pore-divider { display: flex; gap: 14px; justify-content: center; padding: 6px 0; }
.pore-divider i { width: 5px; height: 5px; border-radius: 50%; background: var(--teal-400); opacity: .45; }
.pore-divider i:nth-child(2n) { width: 8px; height: 8px; opacity: .3; }
.pore-divider i:nth-child(3n) { width: 3px; height: 3px; opacity: .6; }

/* ============================================================
   Header (스티키 · 밝은 배경 전용 — 로고 제약)
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--navy-100);
  transition: box-shadow var(--dur-fast) var(--ease-standard), transform var(--dur-base) var(--ease-standard);
}
.site-header.is-scrolled { box-shadow: 0 4px 24px rgba(10,24,48,.08); }
.header-inner {
  max-width: var(--content-max); margin-inline: auto; padding: 0 var(--gutter);
  display: flex; align-items: center; gap: var(--sp-3); min-height: 92px;
}
.brand { display: flex; align-items: center; flex-shrink: 0; }
.brand img { height: 68px; width: auto; display: block; }
@media (max-width: 992px) { .brand img { height: 56px; } }

.main-nav { margin-left: auto; }
.main-nav > ul { display: flex; list-style: none; gap: 4px; }
.nav-item { position: relative; }
.nav-item > button, .nav-item > a {
  display: inline-flex; align-items: center; gap: 6px;
  font: 600 var(--fs-16)/1 var(--font-sans); color: var(--navy-900);
  background: none; border: 0; padding: 14px 14px; cursor: pointer; border-radius: 8px;
}
.nav-item > button:hover, .nav-item > a:hover { background: var(--navy-050); text-decoration: none; }
.nav-item.is-active > button, .nav-item.is-active > a { color: var(--teal-700); }
.nav-item .caret { width: 8px; height: 8px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(45deg) translateY(-2px); transition: transform var(--dur-fast); }
.nav-item > button[aria-expanded="true"] .caret { transform: rotate(225deg) translateY(-1px); }

.dropdown {
  position: absolute; top: calc(100% + 6px); left: 0; min-width: 250px;
  background: #fff; border: 1px solid var(--navy-100); border-radius: var(--radius);
  box-shadow: 0 18px 40px rgba(10,24,48,.14); padding: 8px; list-style: none;
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity var(--dur-fast) var(--ease-standard), transform var(--dur-fast) var(--ease-standard), visibility var(--dur-fast);
}
.nav-item > button[aria-expanded="true"] + .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown a { display: block; padding: 11px 14px; border-radius: 7px; color: var(--ink-900); font-size: var(--fs-16); }
.dropdown a:hover { background: var(--teal-100); color: var(--teal-700); text-decoration: none; }

.header-ctas { display: flex; gap: 10px; margin-left: var(--sp-2); }

.nav-toggle { display: none; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 12px 26px; border-radius: 999px;
  font: 600 var(--fs-16)/1.2 var(--font-sans); cursor: pointer; border: 2px solid transparent;
  transition: transform var(--dur-instant) var(--ease-standard), box-shadow var(--dur-fast) var(--ease-standard),
              background var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard);
  text-decoration: none !important;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--primary { background: var(--teal-500); color: #fff; }
.btn--primary:hover { background: var(--teal-400); box-shadow: 0 8px 24px var(--teal-glow); }
.btn--outline { border-color: var(--teal-500); color: var(--teal-700); background: transparent; }
.btn--outline:hover { background: var(--teal-100); }
.on-dark .btn--outline, .section--dark .btn--outline { border-color: var(--teal-300); color: var(--teal-300); }
.on-dark .btn--outline:hover, .section--dark .btn--outline:hover { background: rgba(111,204,195,.12); }
.btn--ghost { color: var(--navy-900); }
/* 비활성(예정) 버튼 — '명백히 아직 아님'으로 읽히게: 점선 아웃라인 + 흐린 톤 + 시계 아이콘 + not-allowed */
.btn[aria-disabled="true"], .btn--disabled {
  background: transparent; color: var(--navy-500); cursor: not-allowed; pointer-events: none;
  border: 1.5px dashed var(--navy-200); box-shadow: none;
}
.btn[aria-disabled="true"]:hover, .btn--disabled:hover { transform: none; }
.btn[aria-disabled="true"] svg, .btn--disabled svg { opacity: .8; }
.on-dark .btn--disabled, .section--dark .btn--disabled {
  color: var(--navy-200); border-color: rgba(255,255,255,.22); background: rgba(255,255,255,.03);
}
.btn--lg { min-height: 56px; padding: 16px 34px; font-size: var(--fs-18); }
/* 브랜드(다크/틸) 배경 위 CTA 버튼 2종 — 인라인 스타일 대체 */
.btn--on-brand { background: #fff; color: var(--navy-900); }
.btn--on-brand:hover { background: var(--navy-050); }
.btn--outline-light { border-color: rgba(255,255,255,.6); color: #fff; }
.btn--outline-light:hover { background: rgba(255,255,255,.12); }

/* Register pulse (1회) */
@keyframes ctaGlowOnce { 0%,100% { box-shadow: 0 0 0 0 var(--teal-glow); } 50% { box-shadow: 0 0 0 14px rgba(61,181,171,0); } }
.btn--pulse-once { animation: ctaGlowOnce 1.4s var(--ease-standard) 1; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer { background: var(--navy-950); color: var(--navy-200); font-size: var(--fs-16); }
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: var(--sp-5);
  padding-block: var(--sp-6) var(--sp-4);
}
.site-footer h2 { color: #fff; margin-bottom: var(--sp-2); font-size: var(--fs-14); text-transform: uppercase; letter-spacing: .12em; font-weight: 600; }
.site-footer a { color: var(--teal-300); }
.site-footer ul { list-style: none; display: grid; gap: 10px; }
/* 푸터 링크 터치 히트영역 확장 (시각 피치 유지) */
.site-footer ul a { display: inline-block; padding-block: 10px; margin-block: -6px; }
.footer-brandline { font-family: var(--font-serif); font-size: var(--fs-25); color: #fff; margin-bottom: var(--sp-2); }
.footer-disclaimer { font-size: var(--fs-14); color: var(--navy-200); line-height: 1.6; border-top: 1px solid var(--navy-800); padding-block: var(--sp-3); }
.footer-bottom { display: flex; justify-content: space-between; gap: var(--sp-2); flex-wrap: wrap; padding-bottom: var(--sp-3); font-size: var(--fs-14); color: var(--navy-200); }

/* ============================================================
   Reveal (스크롤 등장 — 요소당 평생 1회, JS가 .reveal 부여)
   ============================================================ */
.reveal { opacity: 0; transform: translateY(16px); }
.reveal.in-view {
  opacity: 1; transform: none;
  transition: opacity var(--dur-slow) var(--ease-entrance), transform var(--dur-slow) var(--ease-entrance);
  transition-delay: var(--reveal-delay, 0ms);
}

/* ============================================================
   Sub-page hero (공통 규격)
   ============================================================ */
.page-hero {
  background:
    radial-gradient(ellipse 60% 90% at 85% 10%, rgba(30,156,147,.16), transparent 60%),
    radial-gradient(ellipse 40% 70% at 8% 95%, rgba(61,181,171,.08), transparent 65%),
    linear-gradient(135deg, var(--navy-950), var(--navy-800));
  color: #fff; padding-block: clamp(72px, 10vw, 120px) clamp(48px, 6vw, 72px);
  position: relative; overflow: hidden;
}
.page-hero::after { /* 우상단 대형 육각 스트로크 장식 — 무지 히어로의 빈곤 해소 */
  content: ""; position: absolute; right: -60px; top: -80px; width: 280px; height: 320px;
  clip-path: var(--hex-clip); border: 0; pointer-events: none;
  background: linear-gradient(135deg, rgba(111,204,195,.10), rgba(111,204,195,.02));
}
.page-hero .breadcrumb { font-size: var(--fs-14); color: var(--navy-200); margin-bottom: var(--sp-2); }
.page-hero .breadcrumb a { color: var(--teal-300); }
.page-hero h1 { color: #fff; }
.page-hero .lede { margin-top: var(--sp-2); color: var(--navy-200); max-width: 640px; font-size: var(--fs-20); }

/* 사진 히어로 공통 (Tier A) — 배경 img/video + 다크 오버레이 */
.page-hero--photo { isolation: isolate; }
.page-hero--photo .hero-photo { position: absolute; inset: 0; z-index: -1; }
.page-hero--photo .hero-photo img, .page-hero--photo .hero-photo video { width: 100%; height: 100%; object-fit: cover; }
.page-hero--photo .hero-photo::after { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(5,12,28,.88), rgba(10,24,48,.62) 55%, rgba(15,42,64,.78)); }

/* ============================================================
   Mobile
   ============================================================ */
@media (max-width: 992px) {
  /* 헤더의 backdrop-filter는 fixed 자손의 containing block이 되어(Filter Effects L2)
     .main-nav 패널이 뷰포트가 아닌 92px 헤더 기준으로 잡혀 48px 띠로 붕괴한다 — 모바일에선 블러 해제 */
  .site-header { backdrop-filter: none; -webkit-backdrop-filter: none; }
  .main-nav {
    position: fixed; inset: 92px 0 0 0; background: #fff; padding: var(--sp-3);
    transform: translateX(100%); overflow-y: auto; z-index: 99;
    /* 닫힘 상태는 visibility로도 차단 — 화면 밖 메뉴로 키보드 포커스가 튀는 것 방지 */
    visibility: hidden;
    transition: transform var(--dur-base) var(--ease-standard), visibility 0s linear var(--dur-base);
  }
  .main-nav.is-open { transform: none; visibility: visible; transition: transform var(--dur-base) var(--ease-standard); }
  .main-nav > ul { flex-direction: column; gap: 0; }
  .nav-item > button, .nav-item > a { width: 100%; justify-content: space-between; padding: 18px 10px; font-size: var(--fs-20); border-bottom: 1px solid var(--navy-100); border-radius: 0; }
  .dropdown { position: static; opacity: 1; visibility: hidden; transform: none; box-shadow: none; border: 0; display: none; padding: 0 0 10px 14px; }
  .nav-item > button[aria-expanded="true"] + .dropdown { display: block; visibility: visible; }
  .nav-toggle {
    display: inline-flex; align-items: center; gap: 8px; margin-left: auto;
    background: none; border: 1.5px solid var(--navy-100); border-radius: 8px;
    padding: 10px 14px; font: 600 var(--fs-14)/1 var(--font-sans); color: var(--navy-900); cursor: pointer;
    min-height: 44px; /* 터치 최소 타깃 */
  }
  .header-ctas .btn--outline { display: none; } /* Submit Abstract는 메뉴/히어로로 */
  .header-ctas { margin-left: 8px; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--sp-4); }
}

/* 소형 화면(≤560px): 헤더가 375px에 들어가도록 로고·여백·CTA 압축 */
@media (max-width: 560px) {
  .header-inner { padding-inline: 16px; gap: 12px; min-height: 72px; }
  .brand img { height: 44px; }
  .main-nav { inset-block-start: 72px; }
  .nav-toggle { padding: 9px 11px; gap: 6px; }
  .header-ctas { margin-left: 6px; }
  .header-ctas .btn { padding: 11px 18px; min-height: 44px; }
}

/* ============================================================
   Print (Program·Dates 인쇄 시나리오)
   ============================================================ */
@media print {
  .site-header, .site-footer, .pore-divider, .btn, .nav-toggle, .page-hero::before, #cursor-ring, .bg-video, video { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .section--dark { background: #fff; color: #000; }
  .section--dark p, .section--dark h2, .section--dark h3 { color: #000; }
  .reveal { opacity: 1 !important; transform: none !important; }
  /* Program at a Glance 표 — 다크 배경용 밝은 글자를 인쇄용 검정으로 (화면의 '인쇄 친화' 약속 이행) */
  .glance th, .glance td { color: #000 !important; background: #fff !important; border-color: #999 !important; }
  .glance td .cell-title { color: #000 !important; }
  .glance td .cell-desc { color: #333 !important; }
  .glance td.tag-gala, .glance td.tag-social { box-shadow: none !important; }
  .indicative-note { color: #000 !important; background: #fff !important; border-color: #999 !important; }
  .section--dark .disclaimer-text, .section--dark .cd-num, .section--dark .cd-label { color: #000 !important; }
}

/* ============================================================
   S6 "Membrane Pass" — MPA View Transitions (지원 브라우저 한정)
   나가는 페이지 250ms 페이드 → 새 페이지 350ms 12px 상승 등장
   ============================================================ */
@view-transition { navigation: auto; }
::view-transition-old(root) { animation: vtFadeOut 250ms var(--ease-exit) both; }
::view-transition-new(root) { animation: vtRiseIn 350ms var(--ease-entrance) both; }
@keyframes vtFadeOut { to { opacity: 0; } }
@keyframes vtRiseIn { from { opacity: 0; transform: translateY(12px); } }

/* ============================================================
   Figure — 이미지 + 무드 캡션 (호버 줌, 캡션 상승)
   ============================================================ */
.figure { position: relative; border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-card); }
.figure img { width: 100%; height: 100%; object-fit: cover; transition: transform .8s var(--ease-standard); }
.figure:hover img { transform: scale(1.04); }
.figure figcaption {
  position: absolute; inset: auto 0 0 0; padding: 40px 22px 16px;
  background: linear-gradient(to top, rgba(5,12,28,.78), transparent);
  color: #fff; font: 500 var(--fs-14)/1.4 var(--font-sans); letter-spacing: .04em;
  transform: translateY(6px); opacity: .85;
  transition: transform var(--dur-fast) var(--ease-standard), opacity var(--dur-fast);
}
.figure:hover figcaption { transform: none; opacity: 1; }
.figure--tall { aspect-ratio: 3 / 4; }
.figure--wide { aspect-ratio: 16 / 10; }

/* 하단 무드 캡션 (오버레이형 .figure figcaption과 구분되는 2번째 공식형) */
.caption-mood { margin-top: 12px; font-family: var(--font-serif); font-style: italic; font-size: var(--fs-18); color: var(--ink-600); text-align: center; }
.caption-mood--left { text-align: left; }
/* 무클래스 figure의 콘텐츠 이미지 — width/height 속성이 지정된 경우 비율 유지·공간 예약(CLS 방지) */
figure.reveal:not(.figure) img { width: 100%; height: auto; }

/* 배경 비디오 (다크 밴드 앰비언트) */
.bg-video { position: absolute; inset: 0; overflow: hidden; z-index: -1; }
.bg-video video { width: 100%; height: 100%; object-fit: cover; opacity: .32; }
.bg-video::after { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(5,12,28,.55), rgba(10,24,48,.35)); }
/* 모바일: 앰비언트 배경영상(히어로 포함)은 내려받지 않음 — 포스터/그라디언트만 유지 (해외 80%·데이터 절약)
   display:none → IO 미교차 → fx.js가 play()하지 않아 preload="none" 상태로 다운로드 자체가 없음 */
@media (max-width: 768px) { .bg-video video, .hero-media video, .page-hero--photo .hero-photo video { display: none; } }

/* ============================================================
   Reduced motion — 모든 전환·등장 즉시 표시
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
  video[autoplay], .bg-video video, .hero-media video, .page-hero--photo .hero-photo video { display: none !important; } /* 앰비언트 영상 전부 정지 — 포스터/텍스처 폴백 표시 */
  ::view-transition-old(root), ::view-transition-new(root) { animation: none !important; } /* S6 전환도 무효화 */
}