/* ============================================================
   2026SUMMERCAMP — 第四組
   ============================================================ */

:root {
  /* 紙張 — colorhunt 配色 #F7F1DE */
  --bg: #f7f1de;
  --bg2: #f1e9d3;
  --bg3: #e8dcc2;

  /* 調色盤（土系四色：#F7F1DE 米 / #B0BA99 鼠尾草綠 / #9D6638 焦糖棕 / #4E220F 深棕）
     為維持既有變數名，沿用舊名但改為新色。-deep 為文字安全色（對米底 ≥4.5:1），
     base 為裝飾原色，-pale 為淺底。 */

  /* 鼠尾草綠 */
  --cyan: #b0ba99;
  --cyan-deep: #5f6b4e;
  --cyan-pale: #e9ede1;

  /* 焦糖棕（照片中的文字色之一） */
  --salmon: #9d6638;
  --salmon-deep: #8a5729;
  --salmon-pale: #f1e6d4;

  /* 深棕（照片中的文字色之一） */
  --peri: #7a4a2a;
  --peri-deep: #4e220f;
  --peri-pale: #ecdfcd;

  /* 綠（與鼠尾草同系，供光合作用用） */
  --olive: #b0ba99;
  --olive-deep: #5f6b4e;
  --olive-pale: #e9ede1;

  /* 棕（與焦糖同系） */
  --ash: #9d6638;
  --ash-deep: #8a5729;
  --ash-pale: #f1e6d4;

  /* 墨色 */
  --ink: #4e220f;
  --ink2: #5f3418;
  --muted: #7a5a3f;
  --light-muted: #846a4e;

  /* 線條與玻璃 */
  --border: rgba(111, 94, 83, 0.14);
  --border-s: rgba(111, 94, 83, 0.28);
  --border-glass: rgba(255, 255, 255, 0.72);
  --glass-bg: rgba(255, 255, 255, 0.58);
  --glass-bg-strong: rgba(255, 255, 255, 0.78);
  --glass-blur: blur(22px) saturate(160%);

  --shadow-sm: 0 2px 12px rgba(90, 70, 55, 0.08);
  --shadow-md: 0 8px 32px rgba(90, 70, 55, 0.12);
  --shadow-lg: 0 20px 60px rgba(90, 70, 55, 0.16);

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;

  /* 字體 */
  --font-display: "Cormorant Garamond", "Noto Serif TC", Georgia, serif;
  --font-body: "Source Serif 4", "Noto Serif TC", Georgia, serif;
  --font-sans: "DM Sans", "Noto Sans TC", system-ui, sans-serif;

  --nav-h: 68px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-io: cubic-bezier(0.65, 0, 0.35, 1);

  /* 預設主色：焦糖棕 */
  --ca: var(--salmon-deep);
  --ca-base: var(--salmon);
  --ca-pale: var(--salmon-pale);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 24px);
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.85;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body.is-locked { overflow: hidden; }

::selection { background: var(--cyan-pale); color: var(--ink); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb {
  background: rgba(111, 94, 83, 0.28);
  border-radius: 99px;
  border: 2px solid var(--bg2);
}
::-webkit-scrollbar-thumb:hover { background: rgba(111, 94, 83, 0.45); }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--ca);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ============================================================
   載入動畫
   ============================================================ */
.loader {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 30px;
  background: var(--bg);
  transition: opacity 0.7s var(--ease), visibility 0.7s;
}
.loader.is-done { opacity: 0; visibility: hidden; }

.loader__helix { display: flex; gap: 8px; height: 54px; align-items: center; }
.loader__helix span {
  width: 4px;
  height: 4px;
  border-radius: 99px;
  background: var(--cyan);
  animation: helixBar 1.5s var(--ease-io) infinite;
}
.loader__helix span:nth-child(1) { animation-delay: 0s; }
.loader__helix span:nth-child(2) { animation-delay: 0.09s; }
.loader__helix span:nth-child(3) { animation-delay: 0.18s; }
.loader__helix span:nth-child(4) { animation-delay: 0.27s; }
.loader__helix span:nth-child(5) { animation-delay: 0.36s; }
.loader__helix span:nth-child(6) { animation-delay: 0.45s; }
.loader__helix span:nth-child(7) { animation-delay: 0.54s; }
.loader__helix span:nth-child(8) { animation-delay: 0.63s; }
.loader__helix span:nth-child(9) { animation-delay: 0.72s; }
.loader__helix span:nth-child(10) { animation-delay: 0.81s; }

@keyframes helixBar {
  0%, 100% { transform: scaleY(1); background: var(--cyan); }
  50% { transform: scaleY(7); background: var(--peri); }
}

.loader__text {
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.34em;
  color: var(--light-muted);
  text-indent: 0.34em;
  animation: pulseText 2s ease-in-out infinite;
}
@keyframes pulseText { 0%, 100% { opacity: 0.45; } 50% { opacity: 1; } }

/* ============================================================
   背景
   ============================================================ */
.orbs {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.32;
  will-change: transform;
}
.orb--1 {
  width: 46vw; height: 46vw;
  left: -10vw; top: -8vw;
  background: var(--cyan);
  animation: drift1 26s var(--ease-io) infinite;
}
.orb--2 {
  width: 40vw; height: 40vw;
  right: -8vw; top: 18vh;
  background: var(--salmon);
  opacity: 0.26;
  animation: drift2 32s var(--ease-io) infinite;
}
.orb--3 {
  width: 42vw; height: 42vw;
  left: 26vw; bottom: -16vw;
  background: var(--peri);
  opacity: 0.2;
  animation: drift3 29s var(--ease-io) infinite;
}
@keyframes drift1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(6vw, 5vh) scale(1.12); }
}
@keyframes drift2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-7vw, 7vh) scale(0.9); }
}
@keyframes drift3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(4vw, -6vh) scale(1.15); }
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image: radial-gradient(rgba(111, 94, 83, 0.055) 1px, transparent 1px);
  background-size: 3px 3px;
}

/* ============================================================
   捲動進度
   ============================================================ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 100%;
  z-index: 60;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--peri) 50%, var(--salmon));
}

/* ============================================================
   導覽列
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background 0.4s var(--ease), backdrop-filter 0.4s var(--ease),
    box-shadow 0.4s var(--ease), height 0.4s var(--ease);
}
.nav.is-stuck {
  height: 60px;
  background: rgba(250, 246, 241, 0.72);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: 0 1px 0 rgba(111, 94, 83, 0.06), var(--shadow-sm);
}

.nav__inner {
  width: min(1240px, 100%);
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 32px);
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
  transition: transform 0.35s var(--ease);
}
.nav__brand:hover { transform: translateY(-1px); }

.nav__brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(140deg, var(--cyan-deep), var(--peri-deep));
  box-shadow: var(--shadow-sm);
}
.nav__brand-mark svg { width: 19px; height: 19px; animation: spinY 9s linear infinite; }
@keyframes spinY { to { transform: rotateY(360deg); } }

.nav__brand-text { display: flex; flex-direction: column; line-height: 1.3; }
.nav__brand-text b {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
  font-variant-numeric: lining-nums;
}
.nav__brand-text i {
  font-style: normal;
  font-family: var(--font-sans);
  font-size: 0.58rem;
  font-weight: 500;
  color: var(--light-muted);
  letter-spacing: 0.14em;
}

.nav__links {
  position: relative;
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav__link {
  position: relative;
  z-index: 1;
  padding: 8px 13px;
  border-radius: 99px;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
  transition: color 0.3s var(--ease);
}
.nav__link:hover { color: var(--ink); }
.nav__link.is-active { color: #fff; font-weight: 600; }

.nav__pill {
  position: absolute;
  z-index: 0;
  top: 50%;
  left: 0;
  height: 32px;
  border-radius: 99px;
  background: var(--ink);
  transform: translateY(-50%);
  opacity: 0;
  transition: width 0.45s var(--ease), transform 0.45s var(--ease), opacity 0.3s;
  will-change: transform, width;
}

.nav__burger {
  display: none;
  margin-left: auto;
  width: 42px;
  height: 42px;
  border-radius: 11px;
  border: 1px solid var(--border-s);
  background: var(--glass-bg);
  position: relative;
}
.nav__burger span {
  position: absolute;
  left: 11px;
  width: 20px;
  height: 1.5px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform 0.4s var(--ease), opacity 0.25s var(--ease), width 0.4s var(--ease);
}
.nav__burger span:nth-child(1) { top: 14px; }
.nav__burger span:nth-child(2) { top: 20px; width: 14px; }
.nav__burger span:nth-child(3) { top: 26px; }
.nav__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; transform: translateX(-8px); }
.nav__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 行動版抽屜 */
.drawer {
  position: fixed;
  inset: 0;
  z-index: 45;
  visibility: hidden;
  background: rgba(60, 45, 35, 0.24);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  transition: opacity 0.4s var(--ease), visibility 0.4s;
}
.drawer.is-open { visibility: visible; opacity: 1; }

.drawer__panel {
  position: absolute;
  top: 0;
  right: 0;
  width: min(340px, 86vw);
  height: 100%;
  padding: calc(var(--nav-h) + 20px) 22px 32px;
  overflow-y: auto;
  background: var(--bg);
  box-shadow: var(--shadow-lg);
  transform: translateX(100%);
  transition: transform 0.5s var(--ease);
}
.drawer.is-open .drawer__panel { transform: none; }

.drawer__links { display: flex; flex-direction: column; gap: 3px; }
.drawer__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  opacity: 0;
  transform: translateX(24px);
  transition: background 0.3s, color 0.3s;
}
.drawer.is-open .drawer__link { animation: drawerIn 0.5s var(--ease) forwards; }
@keyframes drawerIn { to { opacity: 1; transform: none; } }

.drawer__link:hover { background: var(--bg2); color: var(--ink); }
.drawer__link.is-active { color: var(--ink); background: var(--bg3); }
.drawer__link i {
  font-style: normal;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background: var(--bg2);
  font-size: 0.62rem;
  font-weight: 600;
  color: var(--light-muted);
}
.drawer__link.is-active i { background: var(--ink); color: var(--bg); }

/* ============================================================
   版面
   ============================================================ */
.app { position: relative; z-index: 1; min-height: 70vh; }

.wrap {
  width: min(880px, 100%);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 32px);
}
.wrap--wide { width: min(1240px, 100%); }

/* .page 本身「任何時候」都不能帶 transform：只要 transform 不是 none，它就會變成
   fixed 子元素的定位容器，左側章節欄（.toc-rail）就會脫離視窗、跟著內容一起捲走並
   壓到正文上。所以進場動畫一律下放到子層，並排除章節欄本身。
   （早期版本把 fill-mode 從 both 改成 backwards，只解決了動畫「結束後」的狀態；
   動畫「進行中」的那 0.65 秒 transform 仍然存在，欄位照樣會飄。） */
.page > *:not(.toc-rail) { animation: pageIn 0.65s var(--ease) backwards; }
@keyframes pageIn {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}
.app.is-leaving .page > * { animation: pageOut 0.28s var(--ease-io) both; }
@keyframes pageOut { to { opacity: 0; transform: translateY(-8px); } }

/* ============================================================
   共用：小標籤
   ============================================================ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ca);
}

/* ============================================================
   首頁 Hero
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: center;
  padding-top: var(--nav-h);
  overflow: hidden;
}
.hero__inner {
  width: min(1240px, 100%);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 32px);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px 7px 8px;
  border-radius: 99px;
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  font-family: var(--font-sans);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  animation: fadeUp 0.8s var(--ease) 0.1s both;
}
.hero__badge b {
  width: 20px; height: 20px;
  border-radius: 99px;
  display: grid; place-items: center;
  background: var(--cyan-deep);
  color: #fff;
  font-size: 0.58rem;
}
.hero__badge::after {
  content: "";
  width: 5px; height: 5px;
  border-radius: 99px;
  background: var(--salmon-deep);
  animation: ping 2.4s var(--ease-io) infinite;
}
@keyframes ping {
  0% { box-shadow: 0 0 0 0 rgba(185, 80, 63, 0.5); }
  70% { box-shadow: 0 0 0 8px rgba(185, 80, 63, 0); }
  100% { box-shadow: 0 0 0 0 rgba(185, 80, 63, 0); }
}

.hero__title {
  margin-top: 26px;
  font-family: var(--font-display);
  font-size: clamp(2.9rem, 8vw, 6rem);
  font-weight: 500;
  line-height: 1.06;
  letter-spacing: -0.005em;
  color: var(--ink);
  font-variant-numeric: lining-nums;
  /* 用 flex 排兩行，是為了關掉「相鄰 margin 合併」。
     .line 靠 padding + 等量負 margin 撐出裁切餘裕，但在一般區塊排版下上下兩個負 margin 會
     合併成其中比較負的那一個，抵銷不完全，行距就會跟著 padding 一起變。改成 flex 之後
     margin 不再合併、正負剛好相消，行距完全由下面這個 gap 決定，跟 padding 脫鉤。 */
  display: flex;
  flex-direction: column;
  row-gap: 0.1em;
}
/* padding + 負 margin：給 overflow 裁切框上下留空間，避免「營」等高字身被切到，
   同時用負 margin 抵銷，維持兩行原本的緊密間距。
   這裡要比下面 em 的 padding 再大一點，否則 em 撐開的背景盒會反過來被這層裁掉。 */
.hero__title .line {
  display: block;
  overflow: hidden;
  padding-block: 0.42em;
  margin-block: -0.42em;
}
.hero__title .line > span { display: block; animation: lineUp 1s var(--ease) both; }
.hero__title .line:nth-child(1) > span { animation-delay: 0.15s; }
.hero__title .line:nth-child(2) > span { animation-delay: 0.28s; }
@keyframes lineUp { from { transform: translateY(105%); } to { transform: none; } }

/* 「營」被裁到的原因在這裡，不是外層的 overflow：
   background-clip:text 的漸層只會畫在 em 這個行內盒「之內」，超出盒子的筆畫拿不到顏色，
   而 color 是 transparent，所以超出的部分直接消失（看起來就是被切掉）。

   而這個盒子的高度是用「字型堆疊裡第一個可用字型」的度量算出來的，也就是拉丁字型
   Cormorant Garamond（asc 89 / desc 28），但中文字其實是由後面的 fallback（Noto Serif TC
   或系統的中文字型）畫出來的——用甲字型的盒子去框乙字型的字，本來就不保證框得住。
   實測上方只剩 8px 餘裕，換一台裝置、fallback 換成別的中文字型（或 Google Fonts 沒載到）
   就會超出去被切掉。

   另外中文字型沒有真正的斜體，瀏覽器是把字「切變」成假斜體，最後一個字的右上角會超出
   前進寬度約 0.11em（96px 時實測 10.4px），所以右邊也要留。

   解法：四邊都把背景盒撐開，再用等量負 margin 抵銷，版面完全不受影響
   （行內元素的 padding／margin 不會改變行高）。 */
.hero__title em {
  font-style: italic;
  padding: 0.3em 0.34em 0.3em 0.12em;
  margin: -0.3em -0.34em -0.3em -0.12em;
  background: linear-gradient(100deg, var(--cyan-deep), var(--peri-deep) 55%, var(--salmon-deep));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  background-size: 200% auto;
  animation: shimmer 7s linear infinite;
}
@keyframes shimmer { to { background-position: 200% center; } }

.hero__sub {
  margin-top: 24px;
  max-width: 54ch;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  font-weight: 300;
  line-height: 1.95;
  color: var(--ink2);
  animation: fadeUp 0.9s var(--ease) 0.45s both;
}

.hero__actions {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  animation: fadeUp 0.9s var(--ease) 0.6s both;
}

.hero__stats {
  margin-top: 58px;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(28px, 5vw, 66px);
  animation: fadeUp 0.9s var(--ease) 0.75s both;
}
.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4.4vw, 3.1rem);
  font-weight: 500;
  line-height: 1;
  color: var(--ca);
  font-variant-numeric: lining-nums;
}
.stat span {
  display: block;
  margin-top: 8px;
  font-family: var(--font-sans);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--light-muted);
}

.hero__scroll {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  display: grid;
  justify-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.55rem;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--light-muted);
  animation: fadeUp 1s var(--ease) 1.1s both;
}
.hero__scroll i {
  width: 1px;
  height: 38px;
  background: linear-gradient(180deg, var(--ash), transparent);
  animation: scrollLine 2.2s var(--ease-io) infinite;
  transform-origin: top;
}
@keyframes scrollLine {
  0% { transform: scaleY(0); opacity: 0; }
  40% { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(1) translateY(38px); opacity: 0; }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: none; }
}

.helix3d {
  position: absolute;
  right: -3vw;
  top: 50%;
  transform: translateY(-50%);
  width: 40vw;
  max-width: 520px;
  aspect-ratio: 1;
  pointer-events: none;
  opacity: 0.9;
}
@media (max-width: 980px) { .helix3d { display: none; } }

/* ============================================================
   按鈕
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 13px 24px;
  border-radius: 99px;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), background 0.35s var(--ease);
}
.btn svg { width: 16px; height: 16px; transition: transform 0.35s var(--ease); }
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  color: var(--bg);
  background: var(--ink);
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover { background: var(--ca); box-shadow: var(--shadow-md); }
.btn--primary:hover svg { transform: translateX(3px); }

.btn--ghost {
  color: var(--ink);
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
}
.btn--ghost:hover { background: var(--glass-bg-strong); box-shadow: var(--shadow-md); }

/* ============================================================
   區塊標題
   ============================================================ */
.section { padding-block: clamp(64px, 9vw, 116px); }

.sec-head { margin-bottom: 42px; }
.sec-head__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ca);
}
.sec-head__eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
  opacity: 0.5;
}
.sec-head h2 {
  margin-top: 14px;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  font-weight: 500;
  line-height: 1.2;
  color: var(--ink);
}
.sec-head p {
  margin-top: 12px;
  max-width: 60ch;
  color: var(--muted);
  font-size: 0.98rem;
  font-weight: 300;
}

/* ============================================================
   課程卡片
   ============================================================ */
.grid-courses {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
}

.ccard {
  position: relative;
  display: block;
  padding: 28px 24px 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform 0.5s var(--ease), box-shadow 0.5s var(--ease), background 0.4s var(--ease);
  transform-style: preserve-3d;
  will-change: transform;
}
.ccard::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(300px circle at var(--mx, 50%) var(--my, 0%), var(--ca-pale), transparent 65%);
  opacity: 0;
  transition: opacity 0.45s var(--ease);
  pointer-events: none;
}
.ccard::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--ca-base), transparent);
  transition: transform 0.6s var(--ease);
}
.ccard:hover {
  background: var(--glass-bg-strong);
  box-shadow: var(--shadow-lg);
}
.ccard:hover::before { opacity: 1; }
.ccard:hover::after { transform: scaleX(1); }

.ccard > * { position: relative; }

.ccard__idx {
  font-family: var(--font-sans);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--light-muted);
}
.ccard__icon {
  margin: 16px 0 18px;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  color: var(--ca);
  background: var(--ca-pale);
  transition: transform 0.5s var(--ease), box-shadow 0.5s var(--ease);
}
.ccard__icon svg { width: 22px; height: 22px; }
.ccard:hover .ccard__icon { transform: scale(1.08) rotate(-5deg); box-shadow: var(--shadow-sm); }

.ccard__title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.35;
}
.ccard__teacher {
  margin-top: 4px;
  font-family: var(--font-sans);
  font-size: 0.74rem;
  color: var(--light-muted);
}
.ccard__foot {
  margin-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.ccard__go {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ca);
  transition: gap 0.35s var(--ease);
}
.ccard:hover .ccard__go { gap: 12px; }
.ccard__go svg { width: 13px; height: 13px; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 99px;
  font-family: var(--font-sans);
  font-size: 0.64rem;
  font-weight: 500;
  border: 1px solid var(--border);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.5);
}
.tag--ok { color: var(--olive-deep); border-color: rgba(102, 119, 97, 0.3); background: var(--olive-pale); }
.tag--wip { color: var(--salmon-deep); border-color: rgba(232, 153, 141, 0.4); background: var(--salmon-pale); }

/* ============================================================
   課程頁首
   ============================================================ */
.phead {
  position: relative;
  padding-top: calc(var(--nav-h) + clamp(46px, 8vw, 84px));
  padding-bottom: clamp(32px, 5vw, 50px);
  overflow: hidden;
}
.phead::before {
  content: "";
  position: absolute;
  top: -34%;
  left: 50%;
  transform: translateX(-50%);
  width: 120vw;
  height: 62vh;
  background: radial-gradient(closest-side, var(--ca-pale), transparent);
  opacity: 0.9;
  pointer-events: none;
  animation: breathe 10s var(--ease-io) infinite;
}
@keyframes breathe {
  0%, 100% { opacity: 0.6; transform: translateX(-50%) scale(1); }
  50% { opacity: 1; transform: translateX(-50%) scale(1.07); }
}

.phead > * { position: relative; }

.crumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  color: var(--light-muted);
  animation: fadeUp 0.6s var(--ease) both;
}
.crumb a { transition: color 0.3s; }
.crumb a:hover { color: var(--ca); }

.phead__kicker {
  margin-top: 18px;
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ca);
  animation: fadeUp 0.7s var(--ease) 0.06s both;
}
.phead h1 {
  margin-top: 12px;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 500;
  line-height: 1.1;
  color: var(--ink);
  animation: fadeUp 0.8s var(--ease) 0.12s both;
}
.phead__teacher {
  margin-top: 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px 7px 7px;
  border-radius: 99px;
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--ink2);
  animation: fadeUp 0.8s var(--ease) 0.2s both;
}
.phead__teacher b {
  width: 25px;
  height: 25px;
  border-radius: 99px;
  display: grid;
  place-items: center;
  font-size: 0.68rem;
  font-weight: 500;
  color: #fff;
  background: var(--ca);
}

/* ============================================================
   章節側欄：固定於視窗最左側，內文維持置中
   ============================================================ */
.toc-rail {
  position: fixed;
  z-index: 20;
  top: calc(var(--nav-h) + 46px);
  left: clamp(20px, 2vw, 44px);
  width: 178px;
  max-height: calc(100vh - var(--nav-h) - 92px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: none;
  animation: fadeUp 0.9s var(--ease) 0.3s both;
}
.toc-rail::-webkit-scrollbar { width: 0; }

.toc-rail__label {
  margin-bottom: 14px;
  font-family: var(--font-sans);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--light-muted);
}

.toc-rail__list {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
}
.toc-rail__list a {
  position: relative;
  padding: 9px 0 9px 16px;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--light-muted);
  transition: color 0.3s var(--ease), transform 0.3s var(--ease);
}
.toc-rail__list a::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  border-radius: 2px;
  background: var(--ca);
  transform: scaleY(0);
  transform-origin: 50% 50%;
  transition: transform 0.4s var(--ease);
}
.toc-rail__list a:hover { color: var(--ink); transform: translateX(2px); }
.toc-rail__list a.is-active { color: var(--ca); font-weight: 600; }
.toc-rail__list a.is-active::before { transform: scaleY(1); }

/* 空間不足以在最左側容納側欄時，改回可橫向捲動的膠囊列 */
@media (max-width: 1339px) {
  .toc-rail {
    position: static;
    width: min(880px, 100%);
    max-height: none;
    margin: 0 auto 32px;
    overflow: visible;
  }
  .toc-rail__inner { padding-inline: clamp(18px, 4vw, 32px); }
  .toc-rail__list {
    flex-direction: row;
    gap: 8px;
    border-left: none;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: none;
  }
  .toc-rail__list::-webkit-scrollbar { height: 0; }
  .toc-rail__list a {
    padding: 7px 14px;
    border-radius: 99px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.5);
    white-space: nowrap;
    color: var(--muted);
  }
  .toc-rail__list a::before { display: none; }
  .toc-rail__list a:hover { transform: none; }
  .toc-rail__list a.is-active {
    color: var(--ca);
    border-color: var(--ca);
    background: var(--ca-pale);
  }
}

/* ============================================================
   文章內容
   ============================================================ */
.article { padding-bottom: clamp(60px, 8vw, 100px); }

.blk { scroll-margin-top: calc(var(--nav-h) + 28px); }
.blk + .blk { margin-top: clamp(46px, 6vw, 72px); }

/* 同一章節內、相鄰區塊之間的留白。
   先前完全沒有這條規則（間距為 0），所以圖說卡片會直接貼上下一個區塊的邊框，
   兩張卡片的框線疊在一起，看起來就像重疊。 */
.blk > * + * { margin-top: clamp(22px, 2.6vw, 32px); }

/* 只要相鄰的任一邊是「有邊框的卡片／圖片」類區塊，就再多留一點，
   讓框線之間有明顯的呼吸空間，不會貼死 */
.blk > * + :is(.gallery, .split, .figure, .video, .cards2, .shift, .refs, .photoph, .photos, .quote, .note, .pending),
.blk > :is(.gallery, .split, .figure, .video, .cards2, .shift, .refs, .photoph, .photos, .quote, .note, .pending) + * {
  margin-top: clamp(36px, 4.4vw, 58px);
}

.blk__head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
}
.blk__head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.05rem);
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
  white-space: nowrap;
}
.blk__head i {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--border-s), transparent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 1s var(--ease) 0.15s;
}
.blk.is-in .blk__head i { transform: scaleX(1); }

.prose p {
  color: var(--ink2);
  font-size: clamp(1rem, 1.35vw, 1.06rem);
  font-weight: 400;
  line-height: 2.05;
  text-align: justify;
}
.prose p + p { margin-top: 18px; }

/* 引言 */
.quote {
  position: relative;
  padding: 32px 34px 32px 40px;
  border-radius: var(--radius);
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.quote::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--ca-base), transparent);
}
.quote::after {
  content: "”";
  position: absolute;
  right: 20px;
  top: -6px;
  font-family: var(--font-display);
  font-size: 6rem;
  line-height: 1;
  color: var(--ca-pale);
  pointer-events: none;
}
.quote p {
  position: relative;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.8vw, 1.32rem);
  font-weight: 400;
  font-style: italic;
  line-height: 1.85;
  color: var(--ink2);
  text-align: left;
}

/* 授課老師 */
.teacher {
  margin-bottom: clamp(40px, 6vw, 64px);
  padding: clamp(24px, 3vw, 34px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
}
.teacher__head {
  display: flex;
  gap: clamp(14px, 2.2vw, 20px);
  align-items: center;
}
.teacher__ava {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: #fff;
  background: var(--ca);
  box-shadow: var(--shadow-sm);
}
.teacher__label {
  font-family: var(--font-sans);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ca);
}
.teacher__name {
  margin-top: 3px;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--ink);
}
.teacher__role {
  margin-top: 2px;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--muted);
}
.teacher__intro {
  margin-top: 16px;
  font-size: 0.96rem;
  line-height: 1.95;
  color: var(--ink2);
}

/* 結構化學經歷／研究／現職 */
.teacher__bio {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2.5vw, 30px);
}
@media (max-width: 720px) {
  .teacher__bio { grid-template-columns: 1fr; gap: 20px; }
}
.teacher__col h4 {
  font-family: var(--font-sans);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ca);
  margin-bottom: 11px;
}
.teacher__col ul {
  list-style: none;
  display: grid;
  gap: 7px;
}
.teacher__col li {
  position: relative;
  padding-left: 14px;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--ink2);
}
.teacher__col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--ca-base);
}
.teacher__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.teacher__chips span {
  font-family: var(--font-sans);
  font-size: 0.73rem;
  padding: 3px 10px;
  border-radius: 99px;
  background: var(--ca-pale);
  color: var(--ca);
  border: 1px solid color-mix(in srgb, var(--ca) 22%, transparent);
}
.teacher__focus {
  margin-top: 11px;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--muted);
}

/* 圖片 */
.figure {
  /* max-width 由行內樣式設為圖片原生寬度，避免放大失真 */
  margin-inline: auto;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  box-shadow: var(--shadow-sm);
}
.figure__media {
  position: relative;
  overflow: hidden;
  cursor: zoom-in;
  background: var(--bg3);
}
/* 完整顯示，不裁切 */
.figure__media img {
  width: 100%;
  height: auto;
  object-fit: contain;
  transition: transform 0.9s var(--ease);
}
.figure__media:hover img { transform: scale(1.03); }
.figure__media::after {
  content: "點擊放大";
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 5px 11px;
  border-radius: 99px;
  font-family: var(--font-sans);
  font-size: 0.64rem;
  font-weight: 500;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
  opacity: 0;
  transform: translateY(6px);
  transition: all 0.4s var(--ease);
}
.figure__media:hover::after { opacity: 1; transform: none; }

.figure figcaption {
  padding: 13px 16px;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--light-muted);
  border-top: 1px solid var(--border);
  line-height: 1.7;
}

/* YouTube 內嵌影片：16:9 響應式播放器 */
.video {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  box-shadow: var(--shadow-sm);
}
.video__frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
}
.video__frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
.video figcaption {
  padding: 13px 16px;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--light-muted);
  border-top: 1px solid var(--border);
  line-height: 1.7;
}

/* 放大版圖片：預設佔滿內文欄寬；寬螢幕（固定側欄存在時）向右延伸放大，
   但絕不超過原生尺寸、也不與最左側章節欄重疊 */
.figure--full {
  width: 100%;
  margin-inline: auto;
}
@media (min-width: 1340px) {
  .figure--full {
    width: min(1080px, calc(100vw - 300px));
    margin-inline: 0;
  }
}

/* 圖片並排：一列至少兩張，不單獨佔一整行 */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  align-items: start;
}

/* 一邊文字、一邊圖片 */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(22px, 3vw, 44px);
  align-items: center;
}
.split--wide { grid-template-columns: 0.82fr 1.18fr; }
.split--flip .split__text { order: 2; }
.split--flip .split__media { order: 1; }
.split__media { min-width: 0; }
.split__media .figure,
.split__media .photoph { margin-inline: auto; }

@media (max-width: 760px) {
  .split, .split--wide { grid-template-columns: minmax(0, 1fr); }
  .split--flip .split__text, .split--flip .split__media { order: 0; }
}

/* 化學位移示意 */
.shift {
  padding: 26px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
}
.shift__bar {
  position: relative;
  height: 8px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--cyan), var(--bg3) 45%, var(--bg3) 55%, var(--salmon));
  overflow: hidden;
}
.shift__bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.75), transparent);
  transform: translateX(-100%);
  animation: sweep 3.4s var(--ease-io) infinite;
}
@keyframes sweep { to { transform: translateX(100%); } }

.shift__labels {
  margin-top: 14px;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-sans);
  font-size: 0.72rem;
}
.shift__labels b { display: block; font-size: 0.86rem; margin-bottom: 3px; }
.shift__labels .up { color: var(--cyan-deep); text-align: left; }
.shift__labels .down { color: var(--salmon-deep); text-align: right; }
.shift__labels span { color: var(--light-muted); }

/* 對照卡 */
.cards2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.dcard {
  padding: 26px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  transition: transform 0.45s var(--ease), box-shadow 0.4s;
}
.dcard:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.dcard__t {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--ca);
}
.dcard__s {
  margin-top: 3px;
  font-family: var(--font-sans);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--light-muted);
}
.dcard p { margin-top: 14px; font-size: 0.94rem; color: var(--ink2); line-height: 1.9; }

/* 參考資料 */
.refs { display: grid; gap: 10px; }
.ref {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  padding: 15px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
  transition: all 0.35s var(--ease);
}
a.ref:hover {
  transform: translateX(5px);
  border-color: var(--ca);
  background: var(--ca-pale);
  box-shadow: var(--shadow-sm);
}
.ref__n {
  flex-shrink: 0;
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.66rem;
  font-weight: 600;
  color: var(--ca);
  background: var(--ca-pale);
}
.ref__l { flex: 1; min-width: 0; color: var(--ink2); overflow-wrap: break-word; }
.ref__u {
  flex: 0 1 auto;
  min-width: 0;
  max-width: 100%;
  font-family: var(--font-sans);
  font-size: 0.68rem;
  color: var(--light-muted);
  overflow-wrap: break-word;
  word-break: break-all;
}
.ref__arrow { color: var(--light-muted); font-size: 0.78rem; }

.note { font-family: var(--font-sans); font-size: 0.76rem; color: var(--light-muted); }

/* ============================================================
   照片待補
   ============================================================ */
.photos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.photoph {
  border-radius: var(--radius);
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.photoph__box {
  position: relative;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 10px;
  padding: 30px 20px;
  min-height: 190px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  overflow: hidden;
}
.photoph--wide .photoph__box { min-height: 260px; }

.photoph__box::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1.5px dashed var(--border-s);
  border-radius: 10px;
  pointer-events: none;
}
.photoph__box::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.55), transparent);
  transform: translateX(-100%);
  animation: sweep 4.5s var(--ease-io) infinite;
  pointer-events: none;
}

.photoph__box > * { position: relative; }

.photoph__icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: var(--ca);
  background: var(--ca-pale);
  animation: float 4s var(--ease-io) infinite;
}
.photoph__icon svg { width: 21px; height: 21px; }

.photoph__box b {
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ca);
}
.photoph__box span {
  font-size: 0.9rem;
  color: var(--muted);
  max-width: 32ch;
  line-height: 1.7;
}

.photoph figcaption {
  padding: 14px 16px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--light-muted);
  line-height: 1.8;
}
.photoph figcaption b {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  border-radius: 5px;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--salmon-deep);
  background: var(--salmon-pale);
}

/* ============================================================
   施工中
   ============================================================ */
.pending {
  display: grid;
  justify-items: center;
  gap: 14px;
  padding: clamp(44px, 7vw, 70px) 26px;
  border-radius: var(--radius-lg);
  border: 1px dashed var(--border-s);
  background: var(--bg2);
  text-align: center;
}
.pending__icon {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  font-size: 1.5rem;
  background: var(--salmon-pale);
  animation: float 3.6s var(--ease-io) infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-7px) rotate(3deg); }
}
.pending b {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--salmon-deep);
}
.pending p { font-size: 0.9rem; color: var(--muted); max-width: 40ch; }
.pending__fields {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 4px;
}
.pending__fields span {
  padding: 5px 12px;
  border-radius: 99px;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  color: var(--muted);
  border: 1px dashed var(--border-s);
}

/* ============================================================
   上下頁
   ============================================================ */
.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: clamp(50px, 7vw, 78px);
  padding-top: 34px;
  border-top: 1px solid var(--border);
}
.pager__item {
  padding: 20px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  box-shadow: var(--shadow-sm);
  transition: all 0.4s var(--ease);
}
.pager__item:hover { background: var(--glass-bg-strong); box-shadow: var(--shadow-md); transform: translateY(-3px); }
.pager__item span {
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--light-muted);
}
.pager__item b {
  display: block;
  margin-top: 6px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--ink);
}
.pager__item--next { text-align: right; }
.pager__item--empty { visibility: hidden; }

/* ============================================================
   自我介紹 / 心得
   ============================================================ */
.people { display: grid; gap: 20px; }

.person {
  position: relative;
  padding: clamp(28px, 4vw, 40px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.5s var(--ease), transform 0.5s var(--ease);
}
.person:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.person::before {
  content: "";
  position: absolute;
  right: -70px;
  top: -70px;
  width: 230px;
  height: 230px;
  border-radius: 50%;
  background: radial-gradient(closest-side, var(--pa-pale), transparent);
  pointer-events: none;
  transition: transform 0.8s var(--ease);
}
.person:hover::before { transform: scale(1.2); }

.person > * { position: relative; }

.person__top { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.person__ava {
  width: 52px;
  height: 52px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  border-radius: 15px;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: #fff;
  background: var(--pa, var(--cyan-deep));
  box-shadow: var(--shadow-sm);
  transition: transform 0.5s var(--ease);
}
.person:hover .person__ava { transform: rotate(-6deg) scale(1.05); }

.person__id h3 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--ink);
}
.person__id span { font-family: var(--font-sans); font-size: 0.74rem; color: var(--light-muted); }

.person__tags { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 7px; }
.person__body { margin-top: 22px; }

/* 心得文章標題 */
.person__essay {
  font-family: var(--font-display);
  font-size: clamp(1.24rem, 1.9vw, 1.42rem);
  font-weight: 600;
  line-height: 1.4;
  color: var(--pa, var(--ink));
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-glass);
}

/* ============================================================
   首頁區塊
   ============================================================ */
.members {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}
.mcard {
  padding: 28px 22px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-glass);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: all 0.45s var(--ease);
}
.mcard:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); background: var(--glass-bg-strong); }
.mcard__ava {
  margin: 0 auto 14px;
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: #fff;
  background: var(--pa, var(--cyan-deep));
  box-shadow: var(--shadow-sm);
  transition: transform 0.5s var(--ease);
}
.mcard:hover .mcard__ava { transform: scale(1.08); }
.mcard b { font-family: var(--font-display); font-size: 1.25rem; font-weight: 600; color: var(--ink); }
.mcard span { display: block; margin-top: 4px; font-family: var(--font-sans); font-size: 0.7rem; color: var(--light-muted); }

.cta {
  position: relative;
  margin-block: clamp(20px, 4vw, 40px);
  padding: clamp(40px, 6vw, 66px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-glass);
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  text-align: center;
}
.cta::before {
  content: "";
  position: absolute;
  inset: -50%;
  background: conic-gradient(from 0deg, transparent, var(--cyan-pale), var(--peri-pale) 18%, transparent 34%);
  animation: rotate 16s linear infinite;
  pointer-events: none;
}
@keyframes rotate { to { transform: rotate(360deg); } }
.cta__in { position: relative; }
.cta h2 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.5rem);
  font-weight: 500;
  color: var(--ink);
}
.cta p { margin-top: 12px; color: var(--muted); font-size: 0.96rem; font-weight: 300; }
.cta .btn { margin-top: 26px; }

/* ============================================================
   頁尾
   ============================================================ */
.footer {
  position: relative;
  z-index: 1;
  margin-top: 40px;
  padding-block: 48px;
  border-top: 1px solid var(--border);
  background: var(--bg2);
}
.footer__inner {
  width: min(1240px, 100%);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 32px);
  display: grid;
  gap: 26px;
}
.footer__brand b {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.footer__brand span {
  display: block;
  margin-top: 5px;
  font-family: var(--font-sans);
  font-size: 0.74rem;
  color: var(--light-muted);
}

.footer__links { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer__links a {
  position: relative;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--muted);
  transition: color 0.3s;
}
.footer__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 1px;
  background: var(--ca);
  transform: scaleX(0);
  transform-origin: 100% 50%;
  transition: transform 0.4s var(--ease);
}
.footer__links a:hover { color: var(--ca); }
.footer__links a:hover::after { transform: scaleX(1); transform-origin: 0 50%; }

.footer__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  font-family: var(--font-sans);
  font-size: 0.74rem;
  color: var(--light-muted);
}
.footer__meta a { transition: color 0.3s; }
.footer__meta a:hover { color: var(--ca); }

/* ============================================================
   FAB
   ============================================================ */
.fab {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 40;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--bg);
  background: var(--ink);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.85);
  transition: all 0.45s var(--ease);
}
.fab.is-show { opacity: 1; visibility: visible; transform: none; }
.fab:hover { transform: translateY(-3px) scale(1.06); background: var(--ca); }
.fab svg { width: 18px; height: 18px; }

/* ============================================================
   燈箱
   ============================================================ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: clamp(16px, 4vw, 48px);
  background: rgba(42, 34, 29, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s var(--ease), visibility 0.4s;
  cursor: zoom-out;
}
.lightbox.is-open { opacity: 1; visibility: visible; }

.lightbox__fig {
  max-width: 100%;
  max-height: 100%;
  display: grid;
  gap: 14px;
  justify-items: center;
  transform: scale(0.94);
  transition: transform 0.5s var(--ease);
}
.lightbox.is-open .lightbox__fig { transform: none; }
.lightbox img {
  max-width: 100%;
  max-height: 78vh;
  width: auto;
  border-radius: 10px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
  object-fit: contain;
}
.lightbox figcaption {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.75);
  text-align: center;
  max-width: 62ch;
}
.lightbox__close {
  position: absolute;
  top: 18px;
  right: 22px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  font-size: 1.6rem;
  line-height: 1;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.1);
  transition: all 0.35s var(--ease);
}
.lightbox__close:hover { background: rgba(255, 255, 255, 0.2); transform: rotate(90deg); }

/* ============================================================
   捲動揭示
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.85s var(--ease), transform 0.85s var(--ease);
  will-change: opacity, transform;
}
/* 動畫跑完就把 will-change 收掉，否則每個元素會永久佔一層合成層，白白吃掉繪圖記憶體 */
.reveal.is-in { opacity: 1; transform: none; will-change: auto; }

/* ============================================================
   RWD
   ============================================================ */
@media (max-width: 1080px) {
  .nav__links { display: none; }
  .nav__burger { display: block; }
}

@media (max-width: 640px) {
  .hero { min-height: 92svh; }
  .hero__stats { gap: 22px; }
  .pager { grid-template-columns: 1fr; }
  .pager__item--empty { display: none; }
  .prose p { text-align: left; }
  .blk__head h2 { white-space: normal; }
  .footer__meta { flex-direction: column; }
  .orb { filter: blur(60px); }
}

/* ============================================================
   減少動態
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .orbs { display: none; }
}