/* ============================================================
   CEO AI Lab — Global Styles
   reset + 基礎排版 + 區塊樣式 + utility
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }

html {
  background: var(--lab-void);
  -webkit-text-size-adjust: 100%;
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  overflow-x: hidden;
}

img, canvas, svg, video { display: block; max-width: 100%; }

h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }

a { color: inherit; text-decoration: none; }

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

input, select, textarea {
  font-family: inherit;
  font-size: var(--fs-body);
  color: var(--text-primary);
}

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

::selection { background: rgba(0, 201, 106, 0.30); }

/* ---------- utility ---------- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.mono {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  color: var(--text-secondary);
}

.prism-text {
  background: var(--lab-prism);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 區塊外殼 ---------- */
.section {
  position: relative;
  padding-block: var(--space-section);
  scroll-margin-top: 84px;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-3);
  margin-bottom: var(--space-5);
}
.section-head .sec-no {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide);
  color: var(--text-tertiary);
}
.section-head h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 600;
  line-height: var(--lh-snug);
  letter-spacing: var(--ls-tight);
}
.section-head .sec-sub {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  color: var(--text-secondary);
  letter-spacing: var(--ls-wide);
}
.section-head .sec-line {
  flex: 1 1 120px;
  height: 1px;
  background: var(--rule);
  align-self: center;
}

/* ---------- 進場動畫 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

.hp-field {
  position: absolute !important;
  left: -9999px !important;
  top: auto !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
}
/* v1.1 改用 class 而非 inline style；
   join 公式 chips 沒出現是因為舊 fallback 的 display 規則被覆蓋 */
.formula-note:not([hidden]) { display: block; }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  border-bottom: 1px solid transparent;
  transition:
    transform 320ms var(--ease-out),
    background-color var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out);
}
/* 隱藏式狀態機三態：top / hidden / pinned */
.site-header[data-state="top"]    { transform: translateY(0); }
.site-header[data-state="hidden"] { transform: translateY(-110%); }
.site-header[data-state="pinned"] {
  transform: translateY(0);
  background: rgba(8, 9, 12, 0.78);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--rule);
}
@media (prefers-reduced-motion: reduce) {
  .site-header { transition-duration: 1ms; }
}
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 64px;
}
.logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: var(--ls-tight);
  white-space: nowrap;
}
.logo .logo-mark {
  display: inline-block;
  width: 10px; height: 10px;
  margin-right: 8px;
  background: var(--lab-prism);
  border-radius: 2px;
  vertical-align: 2px;
}
.main-nav {
  display: flex;
  gap: var(--space-1);
  margin-inline: auto;
}
.main-nav a {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  color: var(--text-secondary);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: color var(--dur-fast) var(--ease-out);
}
.main-nav a:hover { color: var(--text-primary); }
.main-nav a.is-active { color: var(--nav-ch, var(--text-primary)); }
.header-actions { display: flex; align-items: center; gap: var(--space-2); }

.lang-switch {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  color: var(--text-secondary);
  border: 1px solid var(--control-line);
  border-radius: 999px;
  padding: 6px 14px;
  transition: color var(--dur-fast), border-color var(--dur-fast);
}
.lang-switch:hover { color: var(--text-primary); border-color: var(--rule-strong); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  padding: 10px 20px;
  border-radius: 999px;
  border: 1px solid var(--control-line);
  color: var(--text-primary);
  transition: border-color var(--dur-fast), background var(--dur-fast), transform var(--dur-fast);
}
.btn:hover { border-color: var(--rule-strong); background: var(--surface-hover); }
.btn-primary {
  border: none;
  background: var(--lab-prism);
  color: #0a0a0f;
  font-weight: 700;
}
.btn-primary:hover { filter: brightness(1.1); background: var(--lab-prism); transform: translateY(-1px); }
.btn-primary:disabled { opacity: 0.55; cursor: progress; transform: none; }
.btn-primary.is-muted {
  background: var(--surface-raised);
  color: var(--text-primary);
  border: 1px solid var(--rule-strong);
}

.menu-btn { display: none; }

@media (max-width: 900px) {
  .main-nav { display: none; }
  .menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px; height: 40px;
    border: 1px solid var(--control-line);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    margin-left: auto;
  }
  .header-actions .btn:not(.menu-btn) { display: none; }
}

/* 漢堡選單（原生 dialog 全屏展開） */
.menu-dialog {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 0;
  border: none;
  background: rgba(8, 9, 12, 0.97);
  color: var(--text-primary);
}
.menu-dialog::backdrop { background: transparent; }
.menu-dialog-inner {
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: var(--space-3) var(--container-pad);
}
.menu-dialog-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 64px;
}
.menu-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-1);
}
.menu-nav a {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  padding: var(--space-1) 0;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}
.menu-nav a .mono { color: var(--text-tertiary); }
.menu-foot { display: flex; gap: var(--space-2); padding-bottom: var(--space-3); }

/* ============================================================
   01 Hero
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
}
#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}
/* 非對稱分割版面：標題釘在左上、副標釘在右下，中央留給發光線框。
   桌機用 space-between 撐開高度；手機收回單欄直式排列（見下方 720px 斷點）。 */
.hero-content {
  position: relative;
  z-index: 2;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-6);
  padding-top: calc(var(--header-h) + var(--space-5));
  padding-bottom: 68px;   /* 讓出底部 .hero-legend 的高度 */
}
.hero-top { max-width: 44rem; }
.hero-bottom {
  align-self: flex-end;
  max-width: 26rem;
  text-align: right;
}
.hero-eyebrow { margin-bottom: var(--space-3); }
.hero-title {
  font-family: var(--font-display);
  font-size: var(--fs-display);
  font-weight: 600;
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
  animation: hero-in var(--dur-base) var(--ease-out) both;
}
.hero-title .hero-line2 {
  display: block;
  font-size: 0.42em;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  margin-top: 0.35em;
}
.hero-subtitle {
  font-size: var(--fs-lead);
  font-weight: 500;
  animation: hero-in var(--dur-base) var(--ease-out) 120ms both;
}
@keyframes hero-in {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .hero-title, .hero-subtitle { animation: none; }
}
@media (max-width: 720px) {
  .hero-content { padding-top: calc(var(--header-h) + var(--space-4)); gap: var(--space-4); }
  .hero-bottom { align-self: flex-start; text-align: left; max-width: none; }
}

/* 中央發光線框：靜態 SVG + CSS 慢速旋轉，零 JS、零逐幀成本 */
.hero-emblem {
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
  width: clamp(240px, 34vw, 480px);
  height: clamp(240px, 34vw, 480px);
  transform: translate(-50%, -50%);
  opacity: 0.5;
  pointer-events: none;
  filter: drop-shadow(0 0 22px rgba(0, 201, 106, 0.45));
}
.hero-emblem polygon, .hero-emblem line {
  fill: none;
  stroke: var(--neon-bright);
  stroke-width: 0.6;
  vector-effect: non-scaling-stroke;
}
.hero-emblem polygon:last-of-type { stroke: var(--neon); opacity: 0.7; }
.hero-emblem-spin { transform-origin: 100px 100px; animation: hero-emblem-spin 70s linear infinite; }
@keyframes hero-emblem-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .hero-emblem-spin { animation: none; }
}
@media (max-width: 720px) {
  .hero-emblem { opacity: 0.32; }
}

.hero-scroll {
  position: absolute;
  right: var(--container-pad);
  bottom: 80px;
  z-index: 2;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-eyebrow);
  color: var(--text-tertiary);
}

/* 底部裝飾錨點列：與參考站「首屏底邊固定導覽」的視覺呼應，
   目的地跟 Header 完全一樣，純粹是首屏內的捷徑，不是第二套導覽系統。 */
.hero-legend {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  padding: 14px var(--container-pad);
  border-top: 1px solid var(--rule);
  background: linear-gradient(to top, rgba(8, 9, 12, 0.5), transparent);
}
.hero-legend a {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--text-tertiary);
  padding: 6px 12px;
  border-radius: 999px;
  transition: color var(--dur-fast);
}
.hero-legend a:hover { color: var(--text-primary); }
.hero-legend a.is-active { color: var(--nav-ch, var(--neon)); }
@media (max-width: 720px) {
  .hero-legend { display: none; }
  .hero-content { padding-bottom: var(--space-3); }
  .hero-scroll { bottom: var(--space-3); }
}

/* ============================================================
   02 Positioning + 貪吃蛇
   ============================================================ */
.positioning-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: center;
}
@media (max-width: 900px) {
  .positioning-grid { grid-template-columns: 1fr; }
  .game-wrap { order: -1; max-width: 480px; margin-inline: auto; width: 100%; }
}
.game-wrap {
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  background: var(--surface-raised);
  padding: var(--space-3);
  box-shadow: var(--shadow-sm);
}
.game-score {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}
.game-score strong { color: var(--text-primary); font-weight: 600; }
.game-stage {
  position: relative;
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--lab-carbon);
  /* 觸控熱點：讓整塊 stage（含 overlay）都能 tap，並關閉瀏覽器預設 300ms 雙擊延遲 */
  touch-action: manipulation;
}
.game-stage canvas { width: 100%; height: 100%; }
.game-stage.glitch canvas { animation: glitch-shift 200ms steps(4) 2; }
/* Flappy Bird 死亡時的全螢幕 RGB split，比 snake 撞牆更狠 */
.game-stage.glitch-hard canvas { animation: glitch-rgb 240ms steps(3) 1; }
@keyframes glitch-shift {
  0%   { transform: translateX(0); filter: none; }
  25%  { transform: translateX(-6px); filter: hue-rotate(40deg); }
  50%  { transform: translateX(5px) scaleY(0.98); filter: hue-rotate(-30deg); }
  75%  { transform: translateX(-3px); filter: none; }
  100% { transform: translateX(0); }
}
@keyframes glitch-rgb {
  0%   { transform: translateX(0); filter: none; }
  25%  { transform: translateX(-4px); filter: hue-rotate(20deg) saturate(1.6); }
  50%  { transform: translateX(5px);  filter: hue-rotate(-30deg) saturate(1.4); }
  75%  { transform: translateX(-3px); filter: hue-rotate(40deg) saturate(1.2); }
  100% { transform: translateX(0); filter: none; }
}
@media (prefers-reduced-motion: reduce) {
  .game-stage.glitch canvas { animation: none; }
  .game-stage.glitch-hard canvas { animation: none; }
}
.game-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  text-align: center;
  background: rgba(8, 9, 12, 0.72);
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  color: var(--text-secondary);
  padding: var(--space-2);
  /* 預設讓事件穿透，canvas 才能接收鍵盤焦點與滑鼠點擊 */
  pointer-events: none;
  cursor: pointer;
}
/* 重新吃回事件的，只有明確可點的按鈕 */
.game-overlay .again-btn { pointer-events: auto; }
/* over 狀態：整個 overlay 變成可點的「重新開始」CTA */
.game-overlay.is-block { pointer-events: auto; }
.game-overlay.is-block { cursor: pointer; }
.game-overlay .big {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  color: var(--text-primary);
}
.game-overlay .again-btn {
  margin-top: var(--space-1);
  border: 1px solid var(--control-line);
  border-radius: 999px;
  padding: 10px 22px;
  color: var(--text-primary);
}
.game-overlay .again-btn:hover { background: var(--surface-hover); }
.game-caption {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide);
  color: var(--text-tertiary);
  display: flex;
  justify-content: space-between;
}

.positioning-copy .eyebrow { margin-bottom: var(--space-2); }
.positioning-copy h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: var(--lh-snug);
  margin-bottom: var(--space-3);
}
.positioning-copy p { color: var(--text-secondary); margin-bottom: var(--space-2); }
.positioning-copy .four-labs {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 600;
  margin: var(--space-3) 0;
  background: var(--lab-prism);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.four-labs-fallback { /* 不支援 background-clip 時的備援 */
  color: var(--text-primary);
}
.lab-underline { text-decoration: none; }
.lab-underline.u-creative  { border-bottom: 2px solid var(--ch-creative); }
.lab-underline.u-business  { border-bottom: 2px solid var(--ch-business); }
.lab-underline.u-ai        { border-bottom: 2px solid var(--ch-ai); }
.lab-underline.u-growth    { border-bottom: 2px solid var(--ch-growth); }

/* ============================================================
   03 Works 瀑布流
   ============================================================ */
.works-columns {
  columns: 4;
  column-gap: var(--space-2);
}
@media (max-width: 1200px) { .works-columns { columns: 3; } }
@media (max-width: 720px)  { .works-columns { columns: 2; } }
.work-card {
  break-inside: avoid;
  margin-bottom: var(--space-2);
  position: relative;
  display: block;
  width: 100%;
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface-raised);
  padding: 0;
  text-align: left;
  cursor: zoom-in;
  transition: border-color var(--dur-fast), transform var(--dur-fast);
}
.work-card:hover { border-color: var(--rule-strong); transform: translateY(-2px); }
.work-cover {
  position: relative;
  display: block;
  width: 100%;
}
.work-cover .ph {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.work-cover .ph svg { width: 42%; height: auto; opacity: 0.85; }
.work-ph-badge {
  position: absolute;
  top: 8px; right: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide);
  color: var(--text-secondary);
  background: rgba(8, 9, 12, 0.7);
  border: 1px solid var(--rule);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
}
.work-meta {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 28px var(--space-2) var(--space-2);
  background: linear-gradient(to top, rgba(8,9,12,.92), rgba(8,9,12,0));
  transform: translateY(35%);
  opacity: 0;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base) var(--ease-out);
}
.work-card:hover .work-meta,
.work-card:focus-visible .work-meta { transform: none; opacity: 1; }
@media (hover: none) { .work-meta { transform: none; opacity: 1; } }
.work-meta h3 { font-size: var(--fs-body); font-weight: 600; line-height: var(--lh-snug); }
.work-tags {
  display: flex;
  gap: 8px;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide);
  color: var(--text-secondary);
}
.cat-chip { color: var(--cat, var(--text-secondary)); }

/* 燈箱 */
.lightbox-dialog {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  margin: 0;
  border: none;
  background: rgba(8, 9, 12, 0.96);
  color: var(--text-primary);
}
.lightbox-dialog::backdrop { background: transparent; }
.lightbox-inner {
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: var(--space-3) var(--container-pad);
}
.lightbox-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.lightbox-count { font-family: var(--font-mono); font-size: var(--fs-caption); color: var(--text-secondary); letter-spacing: var(--ls-wide); }
.lightbox-close {
  border: 1px solid var(--control-line);
  border-radius: 999px;
  padding: 8px 18px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
}
.lightbox-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  min-height: 0;
}
.lightbox-figure {
  max-width: min(760px, 100%);
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  min-height: 0;
}
.lightbox-art {
  width: 100%;
  max-height: 62vh;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.lightbox-art svg { width: 100%; height: auto; max-height: 62vh; }
.lightbox-cap { text-align: center; }
.lightbox-cap h3 { font-family: var(--font-display); font-size: var(--fs-h3); }
.lightbox-cap p { font-family: var(--font-mono); font-size: var(--fs-caption); color: var(--text-secondary); letter-spacing: var(--ls-wide); margin-top: 6px; }
.lightbox-nav {
  border: 1px solid var(--control-line);
  border-radius: 999px;
  width: 48px; height: 48px;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-secondary);
  transition: color var(--dur-fast), border-color var(--dur-fast);
}
.lightbox-nav:hover { color: var(--text-primary); border-color: var(--rule-strong); }
@media (max-width: 720px) {
  .lightbox-body { gap: var(--space-1); }
  .lightbox-nav { width: 40px; height: 40px; }
}

/* ============================================================
   04 四大人才池
   ============================================================ */
.pool {
  display: grid;
  grid-template-columns: minmax(260px, 420px) 1fr;
  gap: var(--space-5);
  align-items: center;
  padding-block: var(--space-5);
  border-top: 1px solid var(--rule);
}
.pool:first-of-type { border-top: none; }
.pool:nth-child(even) .pool-visual { order: 2; }
@media (max-width: 900px) {
  .pool { grid-template-columns: 1fr; }
  .pool:nth-child(even) .pool-visual { order: 0; }
}
.pool-visual {
  position: relative;
  aspect-ratio: 1;
  max-width: 420px;
  width: 100%;
  margin-inline: auto;
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface-raised);
}
.pool-visual canvas { width: 100%; height: 100%; }
.pool-visual .anno {
  position: absolute;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide);
  color: var(--text-tertiary);
  pointer-events: none;
}
.pool-visual .anno.tl { top: 10px; left: 12px; }
.pool-visual .anno.br { bottom: 10px; right: 12px; text-align: right; }
.pool-info .pool-name {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 600;
  color: var(--pool-ch, var(--text-primary));
}
.pool-info .pool-lang {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  color: var(--text-secondary);
  margin-top: 4px;
}
.pool-count {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
  letter-spacing: var(--ls-wide);
  margin-top: var(--space-1);
}
.role-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-1);
  margin-top: var(--space-3);
}
@media (max-width: 720px) { .role-grid { grid-template-columns: repeat(2, 1fr); } }
.role-card {
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  background: var(--surface-raised);
  padding: 14px 16px;
  transition: border-color var(--dur-fast), transform var(--dur-fast);
}
.role-card:hover { border-color: var(--pool-ch, var(--rule-strong)); transform: translateY(-2px); }
.role-card .role-en { font-weight: 600; font-size: var(--fs-caption); }
.role-card .role-zh { font-size: var(--fs-body); margin-top: 2px; }
.role-card .role-sub {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide);
  color: var(--text-tertiary);
  margin-top: 4px;
}

/* ============================================================
   05 元素週期表
   ============================================================ */
.periodic-hint {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  color: var(--text-secondary);
  letter-spacing: var(--ls-wide);
  margin: calc(-1 * var(--space-4)) 0 var(--space-4);
}
.element-group-title {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-eyebrow);
  color: var(--group-ch, var(--text-secondary));
  margin: var(--space-4) 0 var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.element-group-title::after { content: ''; flex: 1; height: 1px; background: var(--rule); }
.periodic-grid {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: var(--space-1);
}
@media (max-width: 1000px) { .periodic-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); } }
@media (max-width: 640px)  { .periodic-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }

.element-cell {
  aspect-ratio: 1;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  background: var(--lab-carbon);
  padding: 6px 7px;
  display: flex;
  flex-direction: column;
  text-align: left;
  position: relative;
  transition: border-color var(--dur-fast), background var(--dur-fast), transform var(--dur-fast);
  overflow: hidden;
}
.element-cell:hover {
  border-color: var(--el-ch);
  background: var(--el-ch-dim);
  transform: translateY(-1px);
}
.element-cell .el-no {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
}
.element-cell .el-symbol {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 0.8rem + 1vw, 2rem);
  font-weight: 600;
  color: var(--el-ch);
  line-height: 1.1;
  margin-top: auto;
  transition: text-shadow var(--dur-fast);
}
.element-cell .el-name, .element-cell .el-zh {
  font-size: var(--fs-micro);
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.element-cell .el-name { font-family: var(--font-mono); color: var(--text-secondary); }
.element-cell .el-zh { color: var(--text-secondary); }
.element-cell[aria-pressed="true"] {
  border: 2px solid transparent;
  background:
    linear-gradient(var(--lab-slate), var(--lab-slate)) padding-box,
    var(--lab-prism) border-box;
}
.element-cell[aria-pressed="true"] .el-symbol { text-shadow: 0 0 18px var(--el-ch); }

/* ============================================================
   06 公式區
   ============================================================ */
.formula-intro {
  max-width: var(--content-max);
  color: var(--text-secondary);
  margin-bottom: var(--space-5);
}
.formula-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
@media (max-width: 1100px) { .formula-cards { grid-template-columns: 1fr; } }
.formula-card {
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  background: var(--surface-raised);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.formula-card .f-no {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-eyebrow);
  color: var(--text-tertiary);
}
.formula-card .f-need { color: var(--text-secondary); font-size: var(--fs-caption); }
.formula-card .f-need-label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide);
  color: var(--text-tertiary);
  display: block;
  margin-bottom: 4px;
}
.formula-svg { width: 100%; height: auto; }
.formula-svg .bond { stroke: var(--rule-strong); stroke-width: 1; }
.formula-svg .bond.draw { stroke-dasharray: 220; stroke-dashoffset: 220; }
.formula-svg .f-node { opacity: 1; transform-origin: center; transform-box: fill-box; }
.formula-svg .f-node.pop { opacity: 0; transform: scale(0.6); }
.formula-svg text { font-family: var(--font-mono); }
.formula-svg .node-symbol { font-family: var(--font-display); font-weight: 600; }
.formula-output {
  margin-top: auto;
  border-top: 1px solid var(--rule);
  padding-top: var(--space-2);
}
.formula-output .f-out-label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide);
  color: var(--text-tertiary);
}
.formula-output .f-out-name {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 600;
  margin-top: 4px;
  background: var(--lab-prism);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.formula-output .f-out-zh { color: var(--text-secondary); font-size: var(--fs-caption); }

/* 公式列（黏底 bar） */
.formula-bar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 55;
  background: rgba(16, 18, 24, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--rule-strong);
  transform: translateY(100%);
  visibility: hidden;
  transition: transform var(--dur-base) var(--ease-out), visibility 0s linear var(--dur-base);
}
.formula-bar.is-open { transform: none; visibility: visible; transition: transform var(--dur-base) var(--ease-out); }
.formula-bar-inner {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  padding-block: 12px;
}
.formula-bar .fb-count {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  color: var(--text-secondary);
  white-space: nowrap;
}
.fb-chips { display: flex; gap: 8px; flex-wrap: wrap; flex: 1; min-width: 0; }
.fb-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  border: 1px solid var(--control-line);
  border-radius: 999px;
  padding: 4px 6px 4px 12px;
  color: var(--text-primary);
  background: var(--surface-hover);
}
.fb-chip .chip-x {
  width: 20px; height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  color: var(--text-secondary);
  font-size: 0.8rem;
}
.fb-chip .chip-x:hover { background: var(--surface-active); color: var(--text-primary); }
.fb-clear {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  color: var(--text-secondary);
  border: 1px solid var(--control-line);
  border-radius: 999px;
  padding: 6px 14px;
}
.fb-clear:hover { color: var(--text-primary); border-color: var(--rule-strong); }

/* ============================================================
   07 About / Lab Director
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-6);
  align-items: start;
}
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .director-card { order: -1; max-width: 420px; margin-inline: auto; width: 100%; }
}
.about-copy h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  margin-bottom: var(--space-3);
}
.about-copy p { color: var(--text-secondary); margin-bottom: var(--space-2); }
.lab-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
  margin-top: var(--space-4);
}
@media (max-width: 640px) { .lab-cards { grid-template-columns: 1fr; } }
.lab-card {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--lc-ch, var(--rule-strong));
  border-radius: var(--radius-md);
  background: var(--surface-raised);
  padding: var(--space-2) var(--space-3);
}
.lab-card h3 { font-size: var(--fs-body); font-weight: 600; }
.lab-card p { color: var(--text-secondary); font-size: var(--fs-caption); margin-top: 6px; }

.director-card {
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  background: var(--surface-raised);
  overflow: hidden;
}
.director-photo {
  position: relative;
  aspect-ratio: 3 / 4;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  overflow: hidden;
}
.director-photo .glow {
  position: absolute;
  inset: auto 0 0 0;
  height: 45%;
  background: var(--lab-prism-soft);
  filter: blur(42px);
  opacity: 0.55;
}
.director-photo svg { position: relative; height: 92%; width: auto; }
.director-pending {
  position: absolute;
  top: 10px; right: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide);
  color: var(--text-secondary);
  border: 1px solid var(--rule);
  background: rgba(8,9,12,.7);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
}
.director-meta { padding: var(--space-3); }
.director-meta .d-title {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-eyebrow);
  color: var(--text-tertiary);
}
.director-meta h3 {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  margin-top: 4px;
}

/* ============================================================
   08 Insights
   ============================================================ */
.insights-note {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  color: var(--text-secondary);
  margin: calc(-1 * var(--space-4)) 0 var(--space-4);
}
.insights-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-2);
}
@media (max-width: 900px) { .insights-grid { grid-template-columns: 1fr; } }
.insight-wide { grid-row: span 3; }
.insight-card {
  position: relative;
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface-raised);
  width: 100%;
  padding: 0;
  text-align: left;
}
.insight-card .thumb {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background: var(--lab-slate);
}
.insight-wide .thumb { aspect-ratio: 16 / 9; }
.insight-short .thumb { aspect-ratio: 9 / 16; max-height: 260px; margin-inline: auto; }
.insight-card img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--dur-base) var(--ease-out); }
.insight-card:hover img { transform: scale(1.03); }
.insight-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.insight-play .play-icon {
  width: 56px; height: 56px;
  border-radius: 999px;
  background: rgba(8, 9, 12, 0.62);
  border: 1px solid var(--rule-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--dur-fast), background var(--dur-fast);
}
.insight-card:hover .play-icon { transform: scale(1.08); background: rgba(8, 9, 12, 0.85); }
.insight-cap {
  padding: 10px 14px;
  font-size: var(--fs-caption);
  display: flex;
  justify-content: space-between;
  gap: 10px;
}
.insight-cap .mono { color: var(--text-tertiary); }
.insight-card .iframe-wrap { position: absolute; inset: 0; }
.insight-card .iframe-wrap iframe { width: 100%; height: 100%; border: 0; }
.insights-shorts { display: grid; gap: var(--space-2); }
@media (min-width: 901px) {
  .insights-shorts { grid-template-columns: repeat(3, 1fr); align-items: start; }
  .insight-short .thumb { max-height: none; }
}

/* ============================================================
   09 Join
   ============================================================ */
.join-wrap { max-width: var(--content-max); margin-inline: auto; }
.join-lead {
  font-size: var(--fs-lead);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}
.apply-form {
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  background: var(--surface-raised);
  padding: var(--space-4);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2); }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
.form-field { margin-bottom: var(--space-3); }
.form-field label {
  display: block;
  font-size: var(--fs-caption);
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-field label .req { color: var(--ch-creative); }
.form-field label .opt {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
  margin-left: 6px;
}
.form-field input[type="text"],
.form-field input[type="tel"],
.form-field input[type="email"],
.form-field input[type="password"],
.form-field select,
.form-field textarea {
  width: 100%;
  background: var(--control-bg);
  border: 1px solid var(--control-line);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  transition: border-color var(--dur-fast);
}
.form-field textarea { resize: vertical; min-height: 120px; }
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none;
  border-color: var(--focus-ring);
}
.form-field select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--lab-mute) 50%), linear-gradient(135deg, var(--lab-mute) 50%, transparent 50%); background-position: calc(100% - 20px) 50%, calc(100% - 14px) 50%; background-size: 6px 6px; background-repeat: no-repeat; }
.field-error {
  font-size: var(--fs-caption);
  color: var(--ch-creative);
  margin-top: 6px;
  min-height: 1.2em;
}
.form-field.has-error input, .form-field.has-error select, .form-field.has-error textarea { border-color: var(--ch-creative); }
.consent-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: var(--fs-caption);
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
}
.consent-row input { margin-top: 3px; accent-color: var(--accent); }
.formula-note {
  display: none;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  color: var(--ch-ai);
  border: 1px dashed rgba(177, 140, 255, 0.4);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  margin-bottom: var(--space-3);
}
.formula-note.is-on { display: block; }
.form-progress {
  height: 2px;
  margin-top: var(--space-2);
  border-radius: 2px;
  overflow: hidden;
  opacity: 0;
  background: var(--rule);
}
.form-progress.is-on { opacity: 1; }
.form-progress .bar {
  height: 100%;
  width: 40%;
  background: var(--lab-prism);
  animation: progress-slide 1.1s var(--ease-inout) infinite;
}
@keyframes progress-slide {
  from { transform: translateX(-110%); }
  to   { transform: translateX(280%); }
}
@media (prefers-reduced-motion: reduce) { .form-progress .bar { animation: none; width: 100%; } }
.join-success {
  border: 1px solid rgba(124, 242, 155, 0.4);
  background: rgba(124, 242, 155, 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
}
.join-success h2,
.join-success h3 {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  color: var(--ch-growth);
  margin-bottom: var(--space-2);
}
.join-success p { color: var(--text-secondary); }
.join-success .js-mark {
  font-size: 2rem;
  color: var(--ch-growth);
  margin-bottom: var(--space-2);
}
.join-success .js-actions { margin-top: var(--space-4); }
.join-success .js-stamp   { margin-top: var(--space-3); color: var(--text-tertiary); }

/* ============================================================
   分頁通用：讓出 fixed Header 高度、頁首標題區
   ============================================================ */
main {
  /* 預設 main 不留頂 padding（首頁 Hero 是全屏沉浸）。
     分頁的 <main> 會加上 .has-page-hero，由 .page-hero 自行處理 sticky 互動。 */
}
main:not(.is-immersive) { padding-top: var(--header-h); }

.page-hero {
  padding-block: clamp(3.5rem, 5vw, 6rem) clamp(2rem, 3vw, 3rem);
  border-bottom: 1px solid var(--rule);
}
.page-hero .eyebrow { display: block; margin-bottom: var(--space-2); }
.page-hero .page-title {
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 600;
  line-height: var(--lh-snug);
  letter-spacing: var(--ls-tight);
}
.page-hero .page-sub {
  color: var(--text-secondary);
  font-size: var(--fs-lead);
  margin-top: var(--space-2);
  max-width: 60ch;
}
.page-hero .page-rule {
  display: block;
  margin-top: var(--space-3);
  height: 1px;
  width: 96px;
  background: var(--lab-prism);
}

.section-tight { padding-block: var(--space-6); }
.section-last { padding-bottom: var(--space-7); }

.section-more {
  margin-top: var(--space-4);
  text-align: left;
}
.arrow-link {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  color: var(--text-secondary);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
  transition: color var(--dur-fast), border-color var(--dur-fast);
}
.arrow-link:hover {
  color: var(--text-primary);
  border-bottom-color: var(--lab-prism);
}
.arrow-link span:last-child {
  font-family: var(--font-sans);
  transition: transform var(--dur-fast);
}
.arrow-link:hover span:last-child { transform: translateX(4px); }

/* ============================================================
   About 頁：品牌敘事 / 四池卡（wide 版）/ Director / Group Map
   ============================================================ */
.about-narrative {
  max-width: 72ch;
  margin-inline: auto;
}
.about-narrative .lede { font-size: var(--fs-lead); color: var(--text-primary); }
.about-narrative p { margin-bottom: var(--space-3); color: var(--text-secondary); }

.lab-cards-wide {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}
.lab-cards-wide .lab-card {
  position: relative;
  border: 1px solid var(--rule);
  border-left: 2px solid var(--lc-ch);
  background: var(--lab-carbon);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}
.lab-cards-wide .lab-card .lab-card-no {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--text-tertiary);
  letter-spacing: var(--ls-wide);
}

.director-block {
  display: grid;
  grid-template-columns: minmax(220px, 280px) 1fr;
  gap: var(--space-5);
  align-items: center;
  margin-top: var(--space-4);
}
.director-photo { position: relative; aspect-ratio: 3 / 4; }
.director-photo svg { width: 100%; height: 100%; }
.director-photo .glow {
  position: absolute; inset: -10%;
  background: var(--lab-prism-soft);
  filter: blur(40px);
  z-index: -1;
  opacity: 0.7;
}
.director-photo .director-pending {
  position: absolute; left: 50%; bottom: 8px; transform: translateX(-50%);
  font-family: var(--font-mono); font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide); color: var(--text-tertiary);
}
.director-meta .d-title {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  color: var(--text-tertiary);
  margin-bottom: var(--space-2);
}
.director-meta h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  letter-spacing: var(--ls-tight);
  margin-bottom: var(--space-3);
}
.director-meta .d-quote {
  font-size: var(--fs-lead);
  color: var(--text-secondary);
}
@media (max-width: 720px) {
  .director-block { grid-template-columns: 1fr; }
  .director-photo { max-width: 260px; }
}

/* Group Map：純 CSS 流程圖 */
.group-map {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  margin-top: var(--space-4);
}
.gm-row { display: flex; gap: var(--space-2); justify-content: center; flex-wrap: wrap; width: 100%; }
.gm-link {
  width: 1px;
  height: 26px;
  background: var(--rule-strong);
  position: relative;
}
.gm-link::after {
  content: '';
  position: absolute;
  left: 50%; bottom: -1px;
  transform: translateX(-50%);
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 6px solid var(--rule-strong);
}
.gm-node {
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  background: var(--lab-carbon);
  padding: var(--space-2) var(--space-3);
  min-width: 180px;
  text-align: center;
}
.gm-node b {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  letter-spacing: var(--ls-wide);
  margin-bottom: 4px;
}
.gm-node span { font-size: var(--fs-caption); color: var(--text-secondary); }
.gm-node.is-self {
  border-color: transparent;
  background-image: linear-gradient(var(--lab-carbon), var(--lab-carbon)), var(--lab-prism);
  background-origin: border-box;
  background-clip: padding-box, border-box;
}
.gm-node.is-self b { background: var(--lab-prism); -webkit-background-clip: text; background-clip: text; color: transparent; }
.group-sub { max-width: 64ch; color: var(--text-secondary); margin-bottom: var(--space-4); }

/* ============================================================
   Insights 頁
   ============================================================ */
.insights-note { color: var(--text-secondary); margin-bottom: var(--space-5); }

/* ============================================================
   /join 頁：公式 chips / 備援聯絡 / 成功狀態
   ============================================================ */
.formula-note {
  border: 1px solid var(--rule);
  background: var(--lab-carbon);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-4);
}
.formula-note[hidden] { display: none; }
.fn-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: var(--space-2);
}
.fn-clear {
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  color: var(--text-secondary);
  padding: 4px 10px;
  border: 1px solid var(--control-line);
  border-radius: 999px;
}
.fn-clear:hover { color: var(--text-primary); border-color: var(--rule-strong); }
.fn-chips {
  display: flex; flex-wrap: wrap; gap: var(--space-1);
  margin-bottom: var(--space-2);
}
.fn-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--chip-ch, var(--rule-strong));
  background: var(--chip-dim, var(--lab-slate));
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
}
.fn-chip-label { display: inline-flex; align-items: baseline; gap: 8px; }
.fn-chip b { font-weight: 600; color: var(--chip-ch, var(--text-primary)); }
.fn-chip i { font-style: normal; color: var(--text-secondary); font-family: var(--font-sans); font-size: var(--fs-caption); }
.fn-chip .chip-x {
  margin-left: 4px;
  color: var(--text-secondary);
  padding: 0 4px;
}
.fn-chip .chip-x:hover { color: var(--text-primary); }
.fn-hint { font-size: var(--fs-caption); color: var(--text-secondary); }

.join-alt { margin-top: var(--space-4); }
.join-alt[hidden] { display: none; }
.join-fallback {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-left: 2px solid var(--accent);
  background: rgba(0, 201, 106, 0.06);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--fs-caption);
  color: var(--text-secondary);
}
.join-fallback a { color: var(--accent); border-bottom: 1px solid var(--rule); }

.form-status[role="status"] {
  margin-top: var(--space-2);
  font-size: var(--fs-caption);
  color: var(--text-secondary);
}
.form-status.is-on { color: var(--ch-creative); }
.form-status a {
  color: var(--accent);
  border-bottom: 1px solid rgba(0, 201, 106, 0.3);
}

/* ============================================================
   Footer：CTA + 多欄 + 稜鏡分隔線
   ============================================================ */
.site-footer {
  background: var(--lab-carbon);
  padding-block: var(--space-7) var(--space-5);
  border-top: 1px solid var(--rule);
}

.footer-cta {
  background: var(--lab-void);
  padding-block: var(--space-7);
}
.footer-cta-inner {
  max-width: 880px;
  text-align: center;
  margin-inline: auto;
}
.footer-cta .eyebrow { margin-bottom: var(--space-3); }
.footer-cta h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 600;
  line-height: var(--lh-snug);
  letter-spacing: var(--ls-tight);
  margin-bottom: var(--space-2);
}
.footer-cta-sub {
  color: var(--text-secondary);
  font-size: var(--fs-lead);
  margin-bottom: var(--space-4);
  max-width: 52ch;
  margin-inline: auto;
}
.footer-cta-actions {
  display: inline-flex; flex-wrap: wrap; gap: var(--space-2);
  justify-content: center;
}

.footer-rule {
  height: 1px;
  background: var(--lab-prism);
  opacity: 0.6;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}
.footer-col .eyebrow { display: block; margin-bottom: var(--space-2); }
.footer-col p { font-size: var(--fs-caption); color: var(--text-secondary); margin-bottom: 6px; }
.footer-links li { margin-bottom: 6px; }
.footer-links a {
  font-size: var(--fs-caption);
  color: var(--text-secondary);
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast), border-color var(--dur-fast);
}
.footer-links a:hover { color: var(--text-primary); border-bottom-color: var(--rule); }
.footer-mail { color: var(--text-primary); border-bottom: 1px solid var(--rule); }
.footer-mail:hover { border-bottom-color: var(--accent); }
.footer-brand { text-align: right; }
.footer-logo { display: inline-flex; align-items: center; margin-top: var(--space-2); }
.footer-brand .footer-group { margin-top: var(--space-2); }
@media (max-width: 720px) { .footer-brand { text-align: left; } }

.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: var(--space-3);
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wide);
  color: var(--text-tertiary);
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ============================================================
   Toast：表單錯誤 / 元素週期表選取提示
   ============================================================ */
.toast {
  position: fixed;
  left: 50%; bottom: 96px;
  transform: translateX(-50%) translateY(8px);
  z-index: 70;
  background: var(--lab-slate);
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  padding: 8px 18px;
  color: var(--text-primary);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base), transform var(--dur-base);
}
.toast.is-on { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============================================================
   404 頁
   ============================================================ */
.section-404 { padding-block: var(--space-8); }
.error-wrap {
  text-align: center;
  max-width: 56ch;
  margin-inline: auto;
}
.error-wrap .eyebrow { display: block; margin-bottom: var(--space-3); }
.error-wrap .page-title { margin-bottom: var(--space-3); }
.error-wrap .page-sub { margin-bottom: var(--space-5); color: var(--text-secondary); }
.error-actions { display: inline-flex; gap: var(--space-2); flex-wrap: wrap; justify-content: center; }


/* ============================================================
   v1.1 修補 — 略過連結、Hero 暈影、手機主 CTA
   ============================================================ */

/* Skip link：先前完全沒有樣式，導致「跳到主要內容」常駐在左上角。
   平時移出畫面，只有鍵盤聚焦時才滑進來。 */
.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translate(-50%, -120%);
  z-index: 200;
  padding: 10px 20px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  background: var(--lab-prism);
  color: #0a0a0f;
  font-family: var(--font-mono);
  font-size: var(--fs-caption);
  font-weight: 700;
  letter-spacing: var(--ls-wide);
  transition: transform var(--dur-fast) var(--ease-out);
}
.skip-link:focus-visible,
.skip-link:focus {
  transform: translate(-50%, 0);
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Hero 暈影：純 CSS 疊層，每幀零成本。
   讓字元雨在四角自然收掉，中央的標題區更聚焦。 */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 85% at 50% 42%, transparent 38%, rgba(8, 9, 12, 0.55) 78%, rgba(8, 9, 12, 0.9) 100%),
    linear-gradient(to bottom, rgba(8, 9, 12, 0.55) 0%, transparent 22%, transparent 72%, var(--lab-void) 100%);
}

/* 捲動提示現在是連結，要有可聚焦的樣式 */
.hero-scroll:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

/* 手機不該把唯一的主要 CTA 整個藏進漢堡選單裡 */
@media (max-width: 900px) {
  .header-actions .btn-join {
    display: inline-flex;
    padding: 8px 14px;
    font-size: 11px;
  }
  .menu-btn { margin-left: 0; }
}
@media (max-width: 380px) {
  .header-actions .btn-join { display: none; }
}