/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

/* ── Variables ── */
:root {
  --nav-h: 52px;
  --black: #1a1a1a;
  --white: #ffffff;
  --off: #f5f5f3;
  --gray: #767676;
  --light: #d8d8d8;
  --font: 'Helvetica Neue', Helvetica, Arial, 'PingFang TC', 'Noto Sans TC', sans-serif;
}

body {
  font-family: var(--font);
  background: var(--white);
  color: var(--black);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 200;
  background: var(--white);
  border-bottom: 1px solid var(--light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.8rem;
}
.nav-name {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--black);
  white-space: nowrap;
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}
.nav-right li > a {
  display: block;
  padding: 0 1.1rem;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--gray);
  transition: color 0.15s;
  line-height: var(--nav-h);
  border-bottom: 2px solid transparent;
}
.nav-right li > a:hover { color: var(--black); }
.nav-right li > a.active { color: var(--black); border-bottom-color: var(--black); }

/* Lang toggle in nav */
.lang-toggle {
  display: flex;
  margin-left: 1rem;
  border-left: 1px solid var(--light);
  padding-left: 1rem;
}
.lang-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--gray);
  padding: 0 0.4rem;
  line-height: var(--nav-h);
  transition: color 0.15s;
}
.lang-btn:hover { color: var(--black); }
.lang-btn.active { color: var(--black); }

/* Page body offset */
.page { padding-top: var(--nav-h); min-height: 100vh; }

/* ── FOOTER ── */
footer {
  background: var(--white);
  color: var(--gray);
  border-top: 1px solid var(--light);
  padding: 1.5rem 1.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  margin-top: 4rem;
}
footer a { color: var(--gray); text-decoration: none; }
footer a:hover { color: var(--black); }

/* ── LANG HIDE ── */
body.en [data-lang="zh"] { display: none !important; }
body.zh [data-lang="en"] { display: none !important; }

/* ── LIGHTBOX ── */
#lightbox {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.96);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}
#lightbox.open { display: flex; }
#lb-img { max-height: 85vh; max-width: 90vw; object-fit: contain; }
#lb-caption {
  color: rgba(255,255,255,0.7);
  font-size: 0.78rem;
  margin-top: 1.2rem;
  text-align: center;
  letter-spacing: 0.04em;
}
#lb-caption strong { color: #fff; display: block; margin-bottom: 0.2rem; font-size: 0.9rem; }
#lb-close {
  position: fixed; top: 1.2rem; right: 1.6rem;
  color: #fff; font-size: 1.1rem;
  cursor: pointer; background: none; border: none;
  font-family: var(--font); letter-spacing: 0.05em;
  opacity: 0.6; transition: opacity 0.2s;
}
#lb-close:hover { opacity: 1; }

/* ── EXHIBITION DETAIL ── */
.exh-detail { max-width: 900px; margin: 0 auto; padding: 3rem 2rem 0; }
.exh-back {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray);
  text-decoration: none;
  margin-bottom: 2rem;
  transition: color 0.15s;
}
.exh-back:hover { color: var(--black); }
.exh-head { margin-bottom: 2.4rem; }
.exh-head .kind {
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 0.7rem;
}
.exh-head h1 {
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  font-weight: 400;
  line-height: 1.25;
  margin-bottom: 0.5rem;
}
.exh-head .meta {
  font-size: 0.85rem;
  color: var(--gray);
  letter-spacing: 0.03em;
}
.exh-film { margin: 0 0 2.6rem; }
.exh-film iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
  display: block;
  background: #000;
}
.exh-sub {
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gray);
  border-top: 1px solid var(--light);
  padding-top: 1rem;
  margin-bottom: 1.2rem;
}
.exh-note {
  font-size: 0.75rem;
  color: var(--gray);
  line-height: 1.7;
  margin-bottom: 1.6rem;
}
/* 展場照：單欄置中，圖置中、文字齊圖左緣 */
#gallery {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3.4rem;
  margin-bottom: 3rem;
}
.shot {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.55rem;
  max-width: 100%;
}
.shot img {
  display: block;
  max-width: 100%;
  max-height: 82vh;
  width: auto; height: auto;
  cursor: zoom-in;
}
.shot .cap {
  width: 100%;
  text-align: left;
  font-size: 0.8rem;
  color: var(--gray);
  letter-spacing: 0.02em;
}
.exh-empty {
  font-size: 0.85rem;
  color: var(--gray);
  padding: 1rem 0 3rem;
}
/* Lightbox stage (detail pages) */
#lb-stage { position: relative; display: flex; align-items: center; justify-content: center; }
#lb-prev, #lb-next {
  position: absolute;
  top: 50%; transform: translateY(-50%);
  background: rgba(255,255,255,0.14);
  border: none; color: #fff; font-size: 1.2rem;
  width: 2.6rem; height: 2.6rem;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: background 0.15s;
}
#lb-prev:hover, #lb-next:hover { background: rgba(255,255,255,0.32); }
#lb-prev { left: -3.2rem; }
#lb-next { right: -3.2rem; }
#lb-counter { display: block; font-size: 0.7rem; color: rgba(255,255,255,0.5); margin-top: 0.5rem; letter-spacing: 0.1em; }

/* ── MOBILE ── */
@media (max-width: 700px) {
  nav { padding: 0 0.7rem; }
  /* 名字可縮、選單與語言鈕固定不縮 → 英文版也不會把中/EN擠出畫面 */
  .nav-name { font-size: 0.72rem; letter-spacing: 0.06em; flex: 0 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .nav-right { flex: none; }
  .nav-right li > a { padding: 0 0.4rem; font-size: 0.62rem; letter-spacing: 0.04em; }
  .lang-toggle { margin-left: 0.4rem; padding-left: 0.4rem; }
  .lang-btn { padding: 0 0.25rem; font-size: 0.62rem; }
  .exh-detail { padding: 2rem 1.2rem 0; }
  #gallery { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  #lb-prev { left: 0.3rem; background: rgba(255,255,255,0.25); }
  #lb-next { right: 0.3rem; background: rgba(255,255,255,0.25); }
}