:root {
  --bg: #0b0d12;
  --fg: #e9ecf2;
  --muted: #8a93a6;
  --card: rgba(255,255,255,0.04);
  --card-border: rgba(255,255,255,0.09);
  --accent: var(--base-accent, #7aa2ff);
  --ease: cubic-bezier(.2,.7,.2,1);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Noto Sans KR", system-ui, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}
/* 시대별 색이 배경에 은은하게 번지도록 */
body::before {
  content: "";
  position: fixed; inset: 0;
  background: radial-gradient(60vw 60vw at 85% 20%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 70%);
  transition: background 0.8s var(--ease);
  pointer-events: none;
  z-index: 0;
}
main, header.hero { position: relative; z-index: 1; }

/* ---------- 상단 진행바 ---------- */
.progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--accent);
  z-index: 50;
  transition: background 0.6s;
}

/* ---------- 고정 연도 카운터 ---------- */
.year-counter {
  position: fixed; right: 28px; bottom: 20px;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: clamp(48px, 9vw, 120px);
  line-height: 1;
  color: var(--accent);
  opacity: 0;
  transition: opacity 0.4s, color 0.6s;
  pointer-events: none;
  z-index: 5;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 40px color-mix(in srgb, var(--accent) 40%, transparent);
}
.year-counter.show { opacity: 0.9; }

/* ---------- 사이드 점 내비 ---------- */
.dots {
  position: fixed; left: 20px; top: 50%; transform: translateY(-50%);
  display: flex; flex-direction: column; gap: 14px;
  z-index: 20;
  opacity: 0; transition: opacity 0.4s;
}
.dots.show { opacity: 1; }
.dots button {
  all: unset; cursor: pointer;
  display: flex; align-items: center; gap: 10px;
  font-size: 12px; color: var(--muted);
}
.dots .dot {
  width: 10px; height: 10px; border-radius: 50%;
  border: 2px solid var(--muted);
  transition: all 0.3s var(--ease);
}
.dots .label { opacity: 0; transform: translateX(-6px); transition: all 0.25s; white-space: nowrap; }
.dots button:hover .label, .dots button.active .label { opacity: 1; transform: none; }
.dots button.active .dot { background: var(--accent); border-color: var(--accent); transform: scale(1.3); }
.dots button.active { color: var(--fg); }

/* ---------- 히어로 ---------- */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center; padding: 0 16px;
}
.hero h1 {
  font-family: "Space Grotesk", "Noto Sans KR", sans-serif;
  font-size: clamp(40px, 8vw, 96px);
  margin: 0; letter-spacing: -0.03em; line-height: 1.05;
}
.hero h1 span { color: var(--accent); }
.hero p { color: var(--muted); font-size: clamp(16px, 2vw, 20px); margin: 20px 0 0; }
.scroll-hint {
  margin-top: 60px; color: var(--muted); font-size: 13px;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.scroll-hint .mouse {
  width: 22px; height: 36px; border: 2px solid var(--muted); border-radius: 12px; position: relative;
}
.scroll-hint .mouse::after {
  content: ""; position: absolute; left: 50%; top: 6px; width: 4px; height: 8px;
  background: var(--muted); border-radius: 2px; transform: translateX(-50%);
  animation: wheel 1.6s infinite;
}
@keyframes wheel { 0% { opacity: 1; top: 6px; } 100% { opacity: 0; top: 18px; } }

/* ---------- 시대 섹션 ---------- */
#timeline { padding-bottom: 15vh; }
.era {
  max-width: 1080px; margin: 0 auto;
  padding: 18vh 16px 10vh 72px;
  min-height: 100vh;
}
.era-head { position: relative; margin-bottom: 48px; }
.era-range {
  font-family: "Space Grotesk", sans-serif;
  font-size: 14px; letter-spacing: 0.2em; color: var(--accent);
}
.era-title { font-size: clamp(30px, 5vw, 56px); font-weight: 900; margin: 6px 0 10px; letter-spacing: -0.02em; line-height: 1.15; }
.era-desc { color: var(--muted); max-width: 640px; margin: 0; font-size: 17px; }

/* 타임라인 세로선 */
.events { position: relative; padding-left: 32px; }
.events::before {
  content: ""; position: absolute; left: 6px; top: 0; bottom: 0; width: 2px;
  background: linear-gradient(var(--accent), transparent);
  opacity: 0.4;
}

.event {
  position: relative; margin-bottom: 22px;
  opacity: 0; transform: translateY(40px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.event.in { opacity: 1; transform: none; }
.event::before {
  content: ""; position: absolute; left: -32px; top: 26px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent);
}

.card {
  all: unset; display: block; width: 100%; box-sizing: border-box;
  cursor: pointer;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 20px 22px;
  transition: border-color 0.25s, background 0.25s, transform 0.25s var(--ease);
}
.card:hover { border-color: color-mix(in srgb, var(--accent) 60%, transparent); transform: translateX(4px); }
.card:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.card-top { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
.card-year { font-family: "Space Grotesk", sans-serif; font-weight: 700; color: var(--accent); font-size: 20px; }
.card-title { font-size: 20px; font-weight: 700; flex: 1; min-width: 180px; }
.card-summary { color: var(--muted); margin: 8px 0 0; }
.card-people, .era-people { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.card-people span, .era-people span {
  font-size: 12px; padding: 2px 10px; border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  color: color-mix(in srgb, var(--accent) 70%, var(--fg));
}
.era-people { margin-top: 18px; align-items: center; }
.era-people span { font-size: 13px; padding: 3px 12px; }
.era-people .era-people-label {
  border: none; padding: 0 6px 0 0; color: var(--muted);
  font-size: 12px; letter-spacing: 0.1em;
}
.card-more {
  display: grid; grid-template-rows: 0fr;
  transition: grid-template-rows 0.4s var(--ease);
}
.card-more > div { overflow: hidden; }
.card.open .card-more { grid-template-rows: 1fr; }
.card-more > div > p { margin: 12px 0 0; }
.card-more > div > :first-child { margin-top: 14px; padding-top: 14px; border-top: 1px dashed var(--card-border); }
.card-more .impact { font-size: 14px; color: var(--accent); margin-top: 8px; }
.toggle-hint { font-size: 12px; color: var(--muted); margin-top: 10px; }
.card.open .toggle-hint { display: none; }

/* 링크 */
.card a { color: var(--accent); text-underline-offset: 3px; }
.card-links { list-style: none; margin: 14px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.card-links a {
  display: inline-block; font-size: 13px; text-decoration: none;
  padding: 4px 12px; border-radius: 8px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  transition: background 0.2s;
}
.card-links a:hover { background: color-mix(in srgb, var(--accent) 24%, transparent); }
.card-share {
  display: inline-block; margin-top: 14px;
  font-size: 12px; color: var(--muted) !important; text-decoration: none;
}
.card-share:hover { color: var(--fg) !important; }
.card-share::before { content: "🔗 "; }

/* 주소로 바로 들어온 사건 강조 */
.event.target .card { animation: flash 2s var(--ease); }
@keyframes flash {
  0%, 30% { border-color: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 25%, transparent); }
  100% { box-shadow: 0 0 0 0 transparent; }
}


/* ---------- 2줄 배치 (front matter에 lanes가 있을 때) ----------
   넓은 화면: 가운데 세로선을 시간축으로 왼쪽/오른쪽 줄, 표시 없는 사건은 가운데 넓은 카드
   위치(top)는 timeline.js가 계산. 좁은 화면에서는 한 줄로 합치고 점 색으로만 구분 */
:root { --lane-right: #6fc7d6; }
.lane-head { display: none; }
.lanes .event[data-lane="right"]::before { border-color: var(--lane-right); }
.lanes .event[data-lane="both"]::before { background: var(--accent); }

@media (min-width: 860px) {
  .lane-head {
    display: grid; grid-template-columns: 1fr 1fr; gap: 80px;
    margin-bottom: 28px;
    font-size: 12px; letter-spacing: 0.12em; color: var(--muted);
  }
  .lane-head span:first-child { text-align: right; }

  .events.lanes { padding-left: 0; }
  .events.lanes::before { left: 50%; transform: translateX(-1px); }

  .lanes .event { position: absolute; margin: 0; width: calc(50% - 40px); }
  .lanes .event[data-lane="left"] { left: 0; }
  .lanes .event[data-lane="right"] { right: 0; }
  .lanes .event[data-lane="both"] { left: 14%; width: 72%; }

  /* 점 중심이 정확히 축 위에 오도록 테두리 포함 14px (전역 box-sizing은 ::before에 안 걸림) */
  .lanes .event::before { box-sizing: border-box; z-index: 1; }
  .lanes .event[data-lane="left"]::before { left: auto; right: -47px; }
  .lanes .event[data-lane="right"]::before { left: -47px; }
  .lanes .event[data-lane="both"]::before { left: 50%; top: -24px; transform: translateX(-50%); }
  .lanes .event::after {
    content: ""; position: absolute; top: 33px; width: 33px; height: 1px;
    background: var(--card-border);
  }
  .lanes .event[data-lane="left"]::after { right: -33px; }
  .lanes .event[data-lane="right"]::after { left: -33px; }
  .lanes .event[data-lane="both"]::after { display: none; }

  .lanes .event[data-lane="left"] .card:hover { transform: translateX(-4px); }
  /* 가운데 카드: 불투명 배경으로 세로선을 가림 */
  .lanes .event[data-lane="both"] .card {
    text-align: center;
    background: linear-gradient(var(--card), var(--card)), var(--bg);
  }
  .lanes .event[data-lane="both"] .card:hover { transform: none; }
  .lanes .event[data-lane="both"] .card-top,
  .lanes .event[data-lane="both"] .card-people,
  .lanes .event[data-lane="both"] .card-links { justify-content: center; }
  .lanes .event[data-lane="both"] .card-title { flex: none; }
}

@media (max-width: 700px) {
  .dots { display: none; }
  .era { padding-left: 16px; }
  .year-counter { right: 12px; bottom: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .event { opacity: 1; transform: none; transition: none; }
}

/* ---------- 홈으로 돌아가기 ---------- */
.back {
  position: fixed; top: 14px; left: 16px; z-index: 60;
  font-size: 13px; color: var(--muted); text-decoration: none;
  padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--card-border);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  backdrop-filter: blur(8px);
  transition: color 0.2s, border-color 0.2s;
}
.back:hover { color: var(--fg); border-color: var(--accent); }
@media (max-width: 700px) {
  .back { position: absolute; }
}

/* ---------- 언어 전환 (English | 한국어) ---------- */
.lang-switch {
  position: fixed; top: 12px; right: 16px; z-index: 60;
  display: flex; align-items: center; gap: 2px;
  padding: 4px 4px 4px 12px; border-radius: 999px;
  border: 1px solid var(--card-border);
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  backdrop-filter: blur(10px);
  font-size: 13px; font-weight: 500;
}
.lang-switch svg {
  width: 15px; height: 15px; margin-right: 6px;
  fill: none; stroke: var(--muted); stroke-width: 1.6;
}
.lang-switch a {
  padding: 6px 14px; border-radius: 999px;
  color: var(--muted); text-decoration: none;
  transition: color 0.2s, background 0.2s;
}
.lang-switch a[href]:hover { color: var(--fg); background: rgba(255,255,255,0.06); }
.lang-switch a.on { color: var(--bg); background: var(--fg); }
@media (max-width: 700px) {
  .lang-switch { position: absolute; }
}