/* ==========================================================================
   伽利略計畫 — 一頁式網站
   色彩：#D8D8D8 / #FFA742 / #4D4D4D / #3895FF / #C3EB00
   ========================================================================== */

:root {
  --c-bg: #f4f4f5;
  --c-paper: rgba(255, 255, 255, 0.9);
  --c-gray: #d8d8d8;
  --c-ink: #4d4d4d;
  --c-ink-strong: #2c2c2c;
  --c-blue: #3895ff;
  --c-lime: #c3eb00;
  --c-orange: #ffa742;
  --font-serif: "Noto Serif TC", "Songti TC", serif;
  --font-sans: "Noto Sans TC", "PingFang TC", sans-serif;
  --nav-h: 56px;
  --pad: 20px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: 0.03em;
  font-size: 16px;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

/* ---- 動態背景 ---- */
#bg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}
/* 使用者關閉動畫時的靜態備援漸層（canvas 仍會定格一幀，此為雙保險） */
@media (prefers-reduced-motion: reduce) {
  body {
    background: linear-gradient(160deg, #ffffff 0%, #eef3f6 40%, #e9eecf 75%, #f4f4f5 100%);
  }
}

/* ---- 頂部導覽 ---- */
.topnav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--pad);
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-gray);
  z-index: 50;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
}
.brand strong {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--c-ink-strong);
  letter-spacing: 0.12em;
}
.brand span {
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  color: var(--c-ink);
  text-transform: uppercase;
}
.topnav-links { display: none; }

@media (min-width: 860px) {
  .topnav-links {
    display: flex;
    gap: 4px;
    list-style: none;
  }
  .topnav-links a {
    display: block;
    padding: 6px 14px;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
  }
  .topnav-links a:hover { color: var(--c-blue); }
  .topnav-links a.active {
    color: var(--c-ink-strong);
    border-bottom-color: var(--c-blue);
  }
  .topnav-links a.join-link {
    border: 1px solid var(--c-ink);
    border-radius: 999px;
    margin-left: 10px;
  }
  .topnav-links a.join-link:hover {
    background: var(--c-ink-strong);
    color: #fff;
  }
}

/* ---- 手機底部導覽 ---- */
.bottomnav {
  position: fixed;
  left: 12px; right: 12px; bottom: 12px;
  display: flex;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--c-gray);
  border-radius: 999px;
  box-shadow: 0 6px 24px rgba(77, 77, 77, 0.14);
  z-index: 50;
}
.bottomnav a {
  flex: 1;
  text-align: center;
  padding: 10px 0 11px;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--c-ink);
  border-radius: 999px;
  transition: color 0.2s, background 0.2s;
}
.bottomnav a small {
  display: block;
  font-size: 0.56rem;
  letter-spacing: 0.14em;
  color: #9a9a9a;
  text-transform: uppercase;
  line-height: 1.2;
}
.bottomnav a.active {
  background: var(--c-ink-strong);
  color: #fff;
}
.bottomnav a.active small { color: var(--c-lime); }

@media (min-width: 860px) {
  .bottomnav { display: none; }
}

/* ---- 首屏 ---- */
.hero {
  min-height: 88svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: calc(var(--nav-h) + 24px) var(--pad) 40px;
  position: relative;
}
.hero-kicker {
  font-size: 0.72rem;
  letter-spacing: 0.42em;
  text-indent: 0.42em;
  color: var(--c-ink);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.hero h1 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(3rem, 11vw, 6.2rem);
  letter-spacing: 0.14em;
  color: var(--c-ink-strong);
  line-height: 1.15;
}
.hero-couplet {
  margin-top: 18px;
  font-family: var(--font-serif);
  font-size: clamp(0.95rem, 3.4vw, 1.25rem);
  letter-spacing: 0.22em;
  color: var(--c-ink);
}
.hero-meta {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  font-size: 0.78rem;
}
.hero-meta span {
  border: 1px solid var(--c-ink);
  border-radius: 999px;
  padding: 3px 14px;
  background: rgba(255, 255, 255, 0.66);
}
.hero-scroll {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.66rem;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  color: var(--c-ink);
  text-decoration: none;
  text-transform: uppercase;
}
.hero-scroll::after {
  content: "";
  display: block;
  width: 1px;
  height: 34px;
  margin: 8px auto 0;
  background: linear-gradient(var(--c-ink), transparent);
  animation: drip 2.2s ease-in-out infinite;
}
@keyframes drip {
  0% { transform: scaleY(0); transform-origin: top; }
  55% { transform: scaleY(1); transform-origin: top; }
  100% { transform: scaleY(1); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .hero-scroll::after { animation: none; }
}

/* ---- 區塊共用 ---- */
.section {
  padding: 64px 0 72px;
  position: relative;
}
.wrap {
  width: min(1080px, 100% - var(--pad) * 2);
  margin-inline: auto;
}
.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 8px;
}
.section-no {
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--c-ink);
}
.section-head h2 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.6rem, 5.4vw, 2.3rem);
  letter-spacing: 0.18em;
  color: var(--c-ink-strong);
}
.section-head .en {
  font-size: 0.66rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: #9a9a9a;
}
.section-rule {
  height: 2px;
  background: linear-gradient(90deg, var(--accent, var(--c-blue)) 0 72px, var(--c-gray) 72px);
  margin-bottom: 14px;
}
.section-intro {
  max-width: 42em;
  margin-bottom: 30px;
  font-size: 0.95rem;
}
#news    { --accent: var(--c-blue); }
#about   { --accent: var(--c-orange); }
#research{ --accent: var(--c-lime); }
#events  { --accent: var(--c-blue); }

/* ---- 卡片 ---- */
.card {
  background: var(--c-paper);
  border: 1px solid var(--c-gray);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 2px 14px rgba(77, 77, 77, 0.06);
}
.card-body { padding: 22px var(--pad) 24px; }
.card h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.22rem;
  letter-spacing: 0.08em;
  color: var(--c-ink-strong);
  line-height: 1.5;
  margin: 6px 0 10px;
}
.card p { margin-bottom: 0.9em; font-size: 0.94rem; }
.card p:last-child { margin-bottom: 0; }
.card img { width: 100%; height: auto; object-fit: cover; }

.tagline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--c-ink);
}
.tagline::before {
  content: "";
  width: 10px; height: 10px;
  background: var(--accent, var(--c-blue));
  border-radius: 2px;
}
.meta-line {
  font-size: 0.8rem;
  color: #8a8a8a;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.quote {
  font-family: var(--font-serif);
  border-left: 3px solid var(--accent, var(--c-blue));
  padding: 4px 0 4px 16px;
  margin: 14px 0 18px;
  color: var(--c-ink-strong);
  font-size: 1.02rem;
  letter-spacing: 0.06em;
}
.quote cite {
  display: block;
  font-family: var(--font-sans);
  font-style: normal;
  font-size: 0.76rem;
  color: #8a8a8a;
  margin-top: 4px;
}

/* ---- 展開閱讀（native details） ---- */
details.fold { margin-top: 14px; border-top: 1px dashed var(--c-gray); }
details.fold > summary {
  list-style: none;
  cursor: pointer;
  padding: 12px 0;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  color: var(--c-ink-strong);
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}
details.fold > summary::-webkit-details-marker { display: none; }
details.fold > summary::before {
  content: "＋";
  color: var(--accent, var(--c-blue));
  font-weight: 700;
}
details.fold[open] > summary::before { content: "－"; }
details.fold > summary:hover { color: var(--c-blue); }
details.fold .fold-body { padding: 2px 0 14px; }
details.fold .fold-body p { font-size: 0.9rem; }
details.fold .fold-body .fold-credit { font-size: 0.8rem; color: #888; }
details.fold details.fold { margin-left: 2px; }

/* ---- 最新消息 ---- */
.news-grid { display: grid; gap: 26px; }
.news-feature .kv { aspect-ratio: 2 / 1; object-fit: cover; }
.news-pair { display: grid; gap: 26px; }
@media (min-width: 760px) {
  .news-pair { grid-template-columns: 1fr 1fr; }
}
.news-pair .card img { aspect-ratio: 3 / 2; }

/* 節目一覽 */
.prog-list {
  columns: 1;
  gap: 28px;
  font-size: 0.86rem;
  list-style: none;
}
@media (min-width: 700px) { .prog-list { columns: 2; } }
.prog-list li {
  break-inside: avoid;
  padding: 7px 0;
  border-bottom: 1px solid #ececec;
}
.prog-list .unit {
  display: block;
  font-size: 0.72rem;
  color: #9a9a9a;
  letter-spacing: 0.08em;
}

/* 橫向滑動海報帶 */
.strip-hint {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: #8a8a8a;
}
.strip-hint::after {
  content: "";
  flex: 0 0 44px;
  height: 1px;
  background: var(--accent, var(--c-blue));
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}
.strip-shell { position: relative; }
/* 右緣漸淡：暗示還有內容可往右滑；滑到底或無溢出時由 JS 關閉 */
.strip-shell::after {
  content: "";
  position: absolute;
  top: 0; right: 0; bottom: 12px;
  width: 64px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0.95));
  pointer-events: none;
  transition: opacity 0.3s;
}
.strip-shell.at-end::after { opacity: 0; }
.strip {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding: 4px 2px 12px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}
/* 手機上約可見 2.5 張（半張露出引導滑動），桌機固定寬 */
.strip > a,
.strip > figure {
  flex: 0 0 clamp(104px, 30vw, 156px);
  scroll-snap-align: start;
}
.strip figure { width: 100%; }
.strip img, .strip .prog-ph {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border: 1px solid var(--c-gray);
  border-radius: 4px;
}
.strip figcaption {
  font-size: 0.68rem;
  color: #8a8a8a;
  padding-top: 5px;
  line-height: 1.5;
  letter-spacing: 0.02em;
}
.strip figcaption .unit {
  display: block;
  font-size: 0.6rem;
  color: #adadad;
  letter-spacing: 0.06em;
}
.strip.strip-lg > a,
.strip.strip-lg > figure { flex-basis: clamp(180px, 56vw, 220px); }
.strip.strip-lg img { aspect-ratio: 3 / 4; }
/* 連結佔位：尚無 href；補上 href 後自動出現 hover 效果 */
a.prog-link { display: block; text-decoration: none; }
a.prog-link[href] { cursor: pointer; }
a.prog-link[href]:hover img,
a.prog-link[href]:hover .prog-ph { border-color: var(--c-blue); }
a.prog-link[href]:hover figcaption { color: var(--c-blue); }
/* 缺圖節目的文字佔位卡 */
.prog-ph {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  color: var(--c-ink);
  background: repeating-linear-gradient(90deg, #fff 0 5px, #f0f0f1 5px 7px);
  border-style: dashed;
  writing-mode: vertical-rl;
}

/* ---- 計畫介紹 ---- */
.about-grid { display: grid; gap: 26px; }
@media (min-width: 860px) {
  .about-grid { grid-template-columns: 3fr 2fr; align-items: start; }
}
.couplet {
  display: flex;
  justify-content: center;
  gap: 26px;
  padding: 26px 12px;
  background: var(--c-paper);
  border: 1px solid var(--c-gray);
  border-radius: 6px;
  margin-top: 26px;
}
.couplet span {
  writing-mode: vertical-rl;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.05rem, 3.6vw, 1.4rem);
  letter-spacing: 0.42em;
  color: var(--c-ink-strong);
}
.couplet .banner {
  font-size: clamp(0.85rem, 3vw, 1.05rem);
  color: var(--c-blue);
  letter-spacing: 0.3em;
}

/* 成員名單 */
.member-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  padding-top: 4px;
}
.member-tags span {
  font-size: 0.82rem;
  border: 1px solid var(--c-gray);
  border-radius: 999px;
  padding: 2px 12px;
  background: #fff;
  letter-spacing: 0.06em;
}

/* 時間軸 */
.timeline {
  list-style: none;
  margin-top: 10px;
  border-left: 2px solid var(--c-gray);
  padding-left: 22px;
}
.timeline li { position: relative; padding: 0 0 22px; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 9px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--c-bg);
  border: 2px solid var(--c-orange);
}
.timeline li.milestone::before { background: var(--c-orange); }
.timeline .year {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--c-ink-strong);
  letter-spacing: 0.1em;
}
.timeline .year em {
  font-style: normal;
  font-size: 0.74rem;
  color: #9a9a9a;
  margin-left: 8px;
  letter-spacing: 0.08em;
}
.timeline p { font-size: 0.88rem; }

/* ---- 專題研究 ---- */
.research-grid { display: grid; gap: 26px; }
@media (min-width: 860px) {
  .research-grid { grid-template-columns: 1fr 1fr; align-items: start; }
}
.research-note {
  margin-top: 22px;
  font-size: 0.84rem;
  color: #8a8a8a;
  border: 1px dashed var(--c-gray);
  border-radius: 6px;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.6);
}
.book-row { display: flex; gap: 12px; margin: 12px 0; }
.book-row img {
  width: 84px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 1px solid var(--c-gray);
  border-radius: 3px;
}
.version-list {
  list-style: none;
  font-size: 0.88rem;
  margin: 8px 0 4px;
}
.version-list li {
  display: flex;
  gap: 14px;
  padding: 5px 0;
  border-bottom: 1px solid #ececec;
}
.version-list .yr { color: #9a9a9a; font-size: 0.8rem; min-width: 88px; }

/* ---- 活動與演出 ---- */
.event-grid { display: grid; gap: 26px; }
@media (min-width: 760px) {
  .event-grid { grid-template-columns: 1fr 1fr; align-items: start; }
}
.event-grid .card img { aspect-ratio: 16 / 10; }
.schedule {
  list-style: none;
  font-size: 0.86rem;
  margin: 6px 0;
}
.schedule li {
  display: flex;
  gap: 12px;
  padding: 4px 0;
}
.schedule .t {
  color: var(--c-blue);
  min-width: 118px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}
.status-chip {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  border-radius: 999px;
  padding: 2px 12px;
  background: var(--c-lime);
  color: var(--c-ink-strong);
  margin-left: 8px;
  vertical-align: 2px;
}

/* ---- 加入與贊助 ---- */
.join {
  padding: 88px 0 120px;
  text-align: center;
}
.join h2 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.8rem, 7vw, 2.8rem);
  letter-spacing: 0.2em;
  color: var(--c-ink-strong);
  margin-bottom: 16px;
}
.join p {
  max-width: 34em;
  margin: 0 auto 10px;
  font-size: 0.95rem;
}
.join-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 30px;
}
.btn {
  display: inline-block;
  padding: 12px 34px;
  border-radius: 999px;
  border: 1px solid var(--c-ink-strong);
  font-size: 0.92rem;
  letter-spacing: 0.18em;
  text-indent: 0.18em;
  text-decoration: none;
  color: var(--c-ink-strong);
  background: rgba(255, 255, 255, 0.8);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  cursor: pointer;
}
.btn:hover { background: var(--c-ink-strong); color: #fff; }
.btn-primary { background: var(--c-ink-strong); color: #fff; }
.btn-primary:hover { background: var(--c-blue); border-color: var(--c-blue); }

/* ---- 頁尾 ---- */
footer {
  border-top: 1px solid var(--c-gray);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  padding: 30px var(--pad) calc(30px + 64px); /* 底部留出手機導覽高度 */
  text-align: center;
  font-size: 0.76rem;
  color: #8a8a8a;
  letter-spacing: 0.08em;
  line-height: 2;
}
@media (min-width: 860px) {
  footer { padding-bottom: 30px; }
}
footer .foot-brand {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--c-ink-strong);
  font-size: 0.95rem;
  letter-spacing: 0.2em;
}

/* ---- 進場顯示 ---- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}