/* =============================================================
   한시의모든것 — 공용 스타일시트
   모든 페이지가 공유하는 CSS (네비, 푸터, 타이포, 레이아웃)
   4색 팔레트: bright-snow / silver / powder-blue / slate-grey
   ============================================================= */

/* ===== Typography System ===== */
:root {
  /* --- Font Families (2종) --- */
  --font-ko: 'Noto Serif KR', serif;
  --font-zh: 'adobe-fangsong-std', fangsong, 'LXGW WenKai Mono TC', 'Noto Serif TC', serif;

  /* --- Font Scale (8단계, Major Third 1.25 기반) --- */
  --fs-number: 64px;   /* 장식 넘버링: 01, 02 등 */
  --fs-display: 48px;  /* 페이지 타이틀: 爲何唐詩 등 한자 대제목 */
  --fs-h1: 36px;       /* 섹션 부제목: 絶句與律詩 등 */
  --fs-h2: 28px;       /* 카드/박스 제목: 平仄與四聲, 山水田園 등 */
  --fs-h3: 22px;       /* 소제목: 四聲, 切韻 등 */
  --fs-lead: 20px;     /* 리드/강조 본문: 인트로, 결론 */
  --fs-body: 16px;     /* 일반 본문 */
  --fs-small: 14px;    /* UI·캡션·메타 */
  --fs-xs: 13px;       /* 드롭다운·트리 하위 */

  /* --- Site Palette (4색) --- */
  --c-bright-snow: #fcfafa;
  --c-silver: #c8d3d5;
  --c-powder-blue: #a4b8c4;
  --c-slate-grey: #6e8387;

  /* --- Color Tokens (텍스트: 블랙 계열, 장식: 팔레트) --- */
  --c-ink: #000;
  --c-heading: #000;
  --c-muted: #333;
  --c-faint: #999;
  --c-warm-bg: var(--c-bright-snow);
  --c-border: var(--c-silver);
}

/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-ko);
  background: #fff;
  color: var(--c-ink);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* ===== 스크롤바 숨기기 ===== */
::-webkit-scrollbar {
  width: 0;
  height: 0;
  display: none;
}
* {
  scrollbar-width: none;   /* Firefox */
  -ms-overflow-style: none; /* IE/Edge */
}

/* ===== Font Stacks ===== */
.zh, .font-zh {
  font-family: var(--font-zh);
}

/* ===== Navigation ===== */
.top-nav {
  position: fixed; top: 0; left: 50%; transform: translateX(-50%); z-index: 100;
  width: 100%; max-width: 1300px;
  padding: 16px 0;
  transition: background 0.4s, box-shadow 0.4s, padding 0.4s;
}

/* 서브페이지: 기본 어두운 배경 */
.top-nav--dark {
  background: #1C2122;
  box-shadow: 5px 0 15px rgba(0,0,0,0.06), -5px 0 15px rgba(0,0,0,0.06), 0 5px 15px rgba(0,0,0,0.3);
}

/* 메인페이지: 투명 → 스크롤 시 어두운 배경 */
.top-nav.is-scrolled {
  background: #1C2122;
  box-shadow: 5px 0 15px rgba(0,0,0,0.06), -5px 0 15px rgba(0,0,0,0.06), 0 5px 15px rgba(0,0,0,0.3);
  padding: 10px 0;
}

.nav-inner {
  max-width: 100%; margin: 0 auto; padding: 0 32px;
  display: flex; justify-content: space-between; align-items: center;
}

.nav-brand {
  font-family: var(--font-zh);
  font-size: var(--fs-lead); color: #fff; text-decoration: none;
  white-space: nowrap;
}

.nav-links {
  display: flex; gap: 6px; align-items: center;
}

.nav-links > a,
.nav-dropdown > .nav-link {
  color: rgba(255,255,255,0.75); text-decoration: none;
  font-size: var(--fs-body); padding: 8px 12px;
  display: inline-block;
  transition: color 0.3s, transform 0.2s ease;
  cursor: pointer;
  white-space: nowrap;
}
.nav-links > a:hover,
.nav-dropdown > .nav-link:hover {
  color: #fff;
  transform: scale(1.1);
}
.nav-links > a.active,
.nav-dropdown > .nav-link.active {
  color: #fff;
}

/* 비활성 메뉴 */
.nav-links > a.disabled,
.nav-dropdown > .nav-link.disabled {
  opacity: 0.4; cursor: default; pointer-events: none;
}

/* ===== Dropdown ===== */
.nav-dropdown {
  position: relative;
}

.dropdown-arrow {
  font-size: 10px; margin-left: 2px;
  display: inline-block; transition: transform 0.2s;
}

.dropdown-panel {
  position: absolute;
  top: 100%; left: 50%;
  min-width: 180px;
  background: #1C2122;
  border-radius: 0 0 8px 8px;
  padding: 6px 0;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  z-index: 200;
  /* 숨김 → 말풍선 애니메이션 */
  opacity: 0;
  transform: translateX(-50%) scale(0.5) translateY(-8px);
  transform-origin: top center;
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.3s ease, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), visibility 0s 0.3s;
}

.nav-dropdown:hover .dropdown-panel,
.nav-dropdown.open .dropdown-panel {
  opacity: 1;
  transform: translateX(-50%) scale(1) translateY(0);
  pointer-events: auto;
  visibility: visible;
  transition: opacity 0.3s ease, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), visibility 0s 0s;
}
.nav-dropdown:hover .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-panel a {
  display: block;
  padding: 8px 20px;
  color: #fff;
  text-decoration: none;
  font-size: var(--fs-xs);
  font-weight: bold;
  transition: transform 0.2s ease;
  transform-origin: center;
  white-space: nowrap;
}
.dropdown-panel a:hover {
  background: transparent;
  color: #fff;
  transform: scale(1.1);
}
.dropdown-panel a.disabled {
  opacity: 0.4;
  cursor: default;
  pointer-events: none;
}
.dropdown-panel a.disabled::after {
  content: ' (준비 중)';
  font-size: 11px;
}

/* ===== 검색 (네비 내) ===== */
.nav-search-wrap {
  position: relative;
}
.nav-search-link {
  display: inline-flex; align-items: center;
  color: rgba(255,255,255,0.75);
  background: none; border: none;
  padding: 8px;
  cursor: pointer;
  transition: color 0.3s;
}
.nav-search-link:hover { color: #fff; }

/* 말풍선 검색 드롭다운 */
.nav-search-bubble {
  position: absolute;
  top: calc(100% + 12px);
  right: -8px;
  width: 280px;
  background: #1C2122;
  border-radius: 12px;
  padding: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
  z-index: 300;

  /* 숨김 상태 */
  opacity: 0;
  transform: scale(0.5) translateY(-8px);
  transform-origin: top right;
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.3s ease, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), visibility 0s 0.3s;
}
/* 말풍선 꼬리 (삼각형) */
.nav-search-bubble::before {
  content: '';
  position: absolute;
  top: -8px; right: 16px;
  width: 16px; height: 16px;
  background: #1C2122;
  transform: rotate(45deg);
  border-radius: 3px 0 0 0;
}
/* 보이기 */
.nav-search-bubble.show {
  opacity: 1;
  transform: scale(1) translateY(0);
  pointer-events: auto;
  visibility: visible;
  transition: opacity 0.3s ease, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), visibility 0s 0s;
}
/* 검색 입력 폼 */
.nav-search-form {
  display: flex;
}
.nav-search-input {
  width: 100%;
  padding: 10px 14px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 8px;
  color: #fff;
  font-family: var(--font-ko);
  font-size: var(--fs-small);
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}
.nav-search-input::placeholder {
  color: rgba(255,255,255,0.4);
}
.nav-search-input:focus {
  background: rgba(255,255,255,0.15);
  border-color: var(--c-powder-blue);
}

/* ===== 네비 우측: 로그인 ===== */
.nav-actions {
  display: flex; align-items: center; gap: 4px;
  flex-shrink: 0;
}

/* 로그인 버튼 (비로그인 상태) */
.nav-login-btn {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.35);
  color: #fff;
  padding: 6px 16px;
  border-radius: 6px;
  font-family: var(--font-ko);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.nav-login-btn:hover {
  background: rgba(255,255,255,0.25);
  border-color: rgba(255,255,255,0.5);
}

/* 아바타 버튼 (로그인 상태) */
.nav-user-wrap { position: relative; display: flex; align-items: center; }
.nav-login-btn[hidden],
.nav-avatar-btn[hidden] { display: none !important; }
.nav-avatar-btn {
  background: none;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  width: 32px; height: 32px;
  padding: 0;
  cursor: pointer;
  overflow: hidden;
  transition: border-color 0.2s;
  display: flex; align-items: center; justify-content: center;
}
.nav-avatar-btn:hover { border-color: rgba(255,255,255,0.7); }
.nav-avatar-img {
  width: 100%; height: 100%;
  object-fit: cover; border-radius: 50%;
}
/* 아바타 없을 때 이니셜 대체 */
.nav-avatar-initial {
  font-size: 14px; font-weight: 600;
  color: #fff; line-height: 1;
}

/* 사용자 드롭다운 */
.nav-user-bubble {
  position: absolute;
  top: calc(100% + 12px);
  right: -4px;
  min-width: 200px;
  background: #1C2122;
  border-radius: 12px;
  padding: 8px 0;
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
  z-index: 300;
  /* 말풍선 애니메이션 */
  opacity: 0;
  transform: scale(0.5) translateY(-8px);
  transform-origin: top right;
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.3s ease, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), visibility 0s 0.3s;
}
.nav-user-bubble::before {
  content: '';
  position: absolute;
  top: -8px; right: 12px;
  width: 16px; height: 16px;
  background: #1C2122;
  transform: rotate(45deg);
  border-radius: 3px 0 0 0;
}
.nav-user-bubble.show {
  opacity: 1;
  transform: scale(1) translateY(0);
  pointer-events: auto;
  visibility: visible;
  transition: opacity 0.3s ease, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), visibility 0s 0s;
}
/* 드롭다운 내 사용자 정보 */
.nav-user-info {
  padding: 12px 16px 10px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.nav-user-display-name {
  font-size: 14px; font-weight: 600; color: #fff;
}
.nav-user-email {
  font-size: 12px; color: rgba(255,255,255,0.45);
  margin-top: 2px;
}
/* 드롭다운 메뉴 항목 */
.nav-user-bubble a,
.nav-user-bubble button.nav-user-menu-item {
  display: block; width: 100%;
  padding: 10px 16px;
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  font-family: var(--font-ko);
  font-size: 13px;
  background: none; border: none;
  text-align: left;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}
.nav-user-bubble a:hover,
.nav-user-bubble button.nav-user-menu-item:hover {
  color: #fff;
  background: rgba(255,255,255,0.06);
}
.nav-user-divider {
  border-top: 1px solid rgba(255,255,255,0.1);
  margin: 4px 0;
}

/* ===== Footer ===== */
.site-footer {
  max-width: 1300px;
  margin: 0 auto;
  padding: 40px;
  background: var(--c-slate-grey);
  color: rgba(252, 250, 250, 0.6);
  text-align: center;
  font-size: var(--fs-xs);
  line-height: 1.8;
  box-shadow: 5px 0 15px rgba(0,0,0,0.06), -5px 0 15px rgba(0,0,0,0.06);
}
.site-footer a {
  color: rgba(252, 250, 250, 0.8);
  text-decoration: none;
}
.site-footer a:hover {
  color: var(--c-bright-snow);
}
.site-footer .footer-brand {
  font-family: var(--font-zh);
  font-size: 16px; color: rgba(252, 250, 250, 0.8);
  margin-bottom: 8px;
}

/* ===== Fade-in Animation ===== */
.fade-in {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-in.visible {
  opacity: 1; transform: translateY(0);
}

/* ===== Section Helpers ===== */
.section { padding: 72px 32px; }
.section--warm { background: var(--c-warm-bg); }
.section--white { background: #fff; }
.section-inner {
  max-width: 900px; margin: 0 auto;
}

/* ===== 1300px 콘텐츠 컨테이너 ===== */
.page-container {
  max-width: 1300px;
  margin: 0 auto;
  background: #fff;
  box-shadow: 5px 0 15px rgba(0,0,0,0.06), -5px 0 15px rgba(0,0,0,0.06);
}

/* ===== 에디토리얼 2컬럼 (era-grid) ===== */
.era-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 48px;
  max-width: 1100px;
  margin: 0 auto;
}
.era-sidebar {
  position: sticky; top: 80px; align-self: start;
}
.era-sidebar-title {
  font-family: var(--font-zh);
  font-size: var(--fs-h1); color: var(--c-heading); margin-bottom: 8px;
}
.era-sidebar-subtitle {
  font-size: var(--fs-small); color: var(--c-faint); margin-bottom: 16px;
}
.era-content { min-width: 0; }

/* ===== Layout 5-a: 사이드바 트리 + 콘텐츠 ===== */
.layout-5a {
  display: flex;
}
.layout-5a .sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--c-bright-snow);
  border-right: 1px solid var(--c-silver);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.layout-5a .sidebar-header {
  padding: 16px; border-bottom: 1px solid var(--c-silver); flex-shrink: 0;
}
.layout-5a .sidebar-tree {
  flex: 1; overflow-y: auto; padding: 8px 0;
}
.layout-5a .content-area {
  flex: 1; overflow-y: auto; background: #fff;
}

/* 시대 트리 */
.era-tree-item {
  padding: 10px 20px;
  font-size: var(--fs-small); color: var(--c-slate-grey);
  cursor: pointer; transition: background 0.15s, color 0.15s;
  display: flex; align-items: center; gap: 8px;
}
.era-tree-item:hover { background: var(--c-silver); color: #fff; }
.era-tree-item.active { color: #fff; font-weight: 700; background: var(--c-slate-grey); }
.era-tree-item.disabled { opacity: 0.4; cursor: default; }
.era-tree-item .tree-arrow {
  font-size: 10px; color: var(--c-powder-blue); transition: transform 0.2s;
}
.era-tree-sub {
  display: none; padding-left: 16px;
}
.era-tree-item.active + .era-tree-sub,
.era-tree-item.expanded + .era-tree-sub {
  display: block;
}
.era-tree-sub-item {
  padding: 6px 20px; font-size: var(--fs-xs); color: var(--c-powder-blue);
  cursor: pointer; transition: background 0.15s, color 0.15s;
}
.era-tree-sub-item:hover { background: var(--c-silver); color: #fff; }
.era-tree-sub-item.active { color: var(--c-slate-grey); font-weight: 600; }

/* ===== Layout 5-b: 상단 시대 탭 + 콘텐츠 (기본값, 페이지에서 오버라이드) ===== */
.era-tab-bar {
  display: flex; gap: 0;
  flex-wrap: nowrap;
  background: var(--c-silver);
}
.era-tab {
  padding: 14px 22px;
  font-size: var(--fs-small); color: rgba(0, 0, 0, 0.4);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: color 0.25s, border-color 0.25s;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.era-tab:hover { color: rgba(0, 0, 0, 0.65); }
.era-tab.active {
  color: #000;
  border-bottom-color: #000;
  font-weight: 700;
}
.era-tab.active:hover { background: rgba(0,0,0,0.03); }

/* 5-b 콘텐츠 영역 */
.content-5b {
  overflow: hidden;
}
.content-5b iframe {
  width: 100%; height: 100%; border: none;
}

/* ===== 플레이스홀더 페이지 ===== */
.placeholder-hero {
  padding: 120px 32px 60px;
  text-align: center;
  background: linear-gradient(to bottom, var(--c-slate-grey), var(--c-powder-blue));
  color: #fff;
}
.placeholder-title {
  font-family: var(--font-zh);
  font-size: clamp(var(--fs-h1), 6vw, 56px);
  margin-bottom: 8px;
}
.placeholder-subtitle {
  font-size: var(--fs-body); color: rgba(255,255,255,0.7);
}
.placeholder-body {
  display: flex; justify-content: center; align-items: center;
  min-height: 50vh; padding: 48px 32px;
}
.placeholder-card {
  max-width: 480px; text-align: center;
  padding: 48px 32px;
  background: var(--c-bright-snow);
  border: 1px solid var(--c-silver);
  border-radius: 16px;
}
.placeholder-icon {
  font-size: 48px; margin-bottom: 16px;
}
.placeholder-card h2 {
  font-size: var(--fs-lead); color: var(--c-heading); margin-bottom: 12px;
}
.placeholder-card p {
  font-size: var(--fs-small); color: var(--c-powder-blue); line-height: 1.8; margin-bottom: 24px;
}
.placeholder-back {
  display: inline-block; padding: 10px 24px;
  background: var(--c-slate-grey); color: #fff;
  text-decoration: none; border-radius: 8px;
  font-size: 14px; transition: background 0.2s;
}
.placeholder-back:hover { background: var(--c-powder-blue); }

/* ===== 커뮤니티 UI 껍데기 ===== */
.coming-soon-banner {
  background: var(--c-bright-snow); border: 1px solid var(--c-silver);
  border-radius: 8px; padding: 14px 20px;
  text-align: center; font-size: var(--fs-small); color: var(--c-slate-grey);
  margin-bottom: 24px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  /* 네비 */
  .nav-inner { padding: 0 16px; }
  .nav-brand { font-size: 17px; }
  .nav-links { gap: 2px; }
  .nav-links > a,
  .nav-dropdown > .nav-link {
    font-size: 12px; padding: 6px 8px;
  }
  .dropdown-panel {
    position: fixed;
    top: auto; left: 16px; right: 16px;
    transform: none;
    border-radius: 8px;
  }

  /* 레이아웃 */
  .era-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .era-sidebar {
    position: static;
  }
  .layout-5a {
    flex-direction: column;
  }
  .layout-5a .sidebar {
    width: 100%; min-width: 100%;
    height: auto; max-height: 40vh;
    border-right: none; border-bottom: 1px solid var(--c-silver);
  }
  .section { padding: 48px 20px; }
  .era-tab { padding: 10px 12px; font-size: 12px; }
}

/* 햄버거 메뉴 (모바일) — 차후 구현 */
.nav-hamburger {
  display: none;
  background: none; border: none;
  color: #fff; cursor: pointer; padding: 8px;
}
@media (max-width: 640px) {
  .nav-hamburger { display: flex; align-items: center; }
  .nav-links { display: none; }
  .nav-links.mobile-open {
    display: flex; flex-direction: column;
    position: fixed; top: 56px; left: 0; right: 0;
    background: #1C2122;
    padding: 16px 0; gap: 0;
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
    z-index: 150;
  }
  .nav-links.mobile-open > a,
  .nav-links.mobile-open .nav-dropdown > .nav-link {
    padding: 12px 24px; font-size: 15px;
  }
  .nav-links.mobile-open .dropdown-panel {
    position: static; transform: none;
    background: #1C2122;
    box-shadow: none; border-radius: 0;
    opacity: 1; visibility: visible; pointer-events: auto;
    transition: none;
  }
  .nav-links.mobile-open .dropdown-panel a {
    color: rgba(255,255,255,0.75);
  }
  /* nav-actions 모바일 */
  .nav-actions { gap: 2px; }
  .nav-login-btn { padding: 5px 12px; font-size: 12px; }
  .nav-avatar-btn { width: 28px; height: 28px; }
}