/* =============================================================================
   marketing-animation.css — 4K 3D 動畫服務頁
   -----------------------------------------------------------------------------
   滿版圖片輪播 → 三段捲動動畫（sticky 舞台）→ 五分類工學影片 → 案例展示 → CTA。
   深色區塊（輪播、捲動、工學、CTA）以 action-ink 為底、on-dark 系列為文字；
   品牌色只用於選中狀態、進度與主要按鈕。
   捲動區預設為一般流程排版（手機、減少動態、沒有 JS）；js/marketing-animation.js
   判斷可做逐格捲動時才在區塊加上 .is-scrub，切換成 sticky 舞台。
   ============================================================================= */

:root {
  --container-max: var(--ds-container-max);
  --container-gutter: clamp(16px, 4vw, 24px);
  --header-height: 64px;
  --stage-gutter: clamp(20px, 5.5vw, 88px);
  --animation-section-space: clamp(var(--ds-space-2xl), 8vw, var(--ds-space-4xl));
  --anim-ease-out: cubic-bezier(.22, 1, .36, 1);
  --anim-dark: var(--ds-color-surface-dark);
  --anim-line: var(--ds-color-on-dark-hairline);
}

@media (min-width: 1024px) { :root { --container-gutter: 32px; --header-height: 72px; } }

/* base.css 的全站平滑捲動會讓 ScrollTrigger 重新量測時讀到錯誤位置（非頂端重新整理後觸發點整段偏移）；
   本頁改回瞬間捲動，頁內錨點由 js/marketing-animation.js 另做平滑捲動 */
html:has(.animation-page) { scroll-behavior: auto; }

.animation-page {
  --ds-font-sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  font-family: var(--ds-font-sans);
  background: var(--ds-color-page);
}

/* 頁首在頂端為透明，疊在滿版 Hero 上；尚未捲動（白底未淡入）時導覽改用淺色，捲動後恢復預設深色 */
.animation-page .ds-site-header[data-scrolled="false"] .ds-site-header__brand img { filter: brightness(0) invert(1); }

.animation-page .ds-site-header[data-scrolled="false"] .ds-site-nav__item > .ds-navbar__link--plain:not([aria-current="page"]),
.animation-page .ds-site-header[data-scrolled="false"] .ds-site-header__whitepaper,
.animation-page .ds-site-header[data-scrolled="false"] .ds-site-header__partner { color: var(--ds-color-on-dark); }

.animation-page .ds-site-header[data-scrolled="false"] .ds-site-header__partner { border-left-color: rgba(255, 255, 255, .3); }

.animation-page .ds-site-header[data-scrolled="false"] .ds-site-nav__item > .ds-navbar__link--plain:hover { color: var(--ds-color-on-dark-strong); }
.animation-page .ds-site-header[data-scrolled="false"] .ds-site-nav__item > .ds-navbar__link--plain[aria-current="page"] { color: var(--ds-color-cyan); }

.animation-page .ds-site-header[data-scrolled="false"] .ds-mobile-nav__bar { background: var(--ds-color-on-dark); }

.animation-container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-gutter);
}

/* 深色區塊共用的焦點樣式 */
.anim-hero :focus-visible,
.anim-chapters :focus-visible,
.anim-eng :focus-visible,
.anim-cta :focus-visible {
  outline: 2px solid var(--ds-color-primary);
  outline-offset: 3px;
}

.anim-icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: var(--ds-radius-full);
  background: transparent;
  color: var(--ds-color-on-dark);
  transition: background-color var(--ds-duration-fast) var(--ds-ease),
              border-color var(--ds-duration-fast) var(--ds-ease);
}

.anim-icon-button:hover { background: rgba(255, 255, 255, .12); border-color: rgba(255, 255, 255, .6); }
.anim-icon-button .ds-icon { font-size: 20px; }

/* ---------------------------------------------------------------------------
   進場動效（案例區沿用舊版行為）
   --------------------------------------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s var(--anim-ease-out), transform .7s var(--anim-ease-out);
  transition-delay: calc(var(--reveal-index, 0) * 90ms);
}

[data-reveal].is-revealed { opacity: 1; transform: none; }

.anim-mask { display: block; overflow: hidden; padding-bottom: .1em; margin-bottom: -.1em; }
.anim-mask > span { display: inline-block; }

body.has-motion [data-hero-in],
body.has-motion [data-head-in] { opacity: 0; }
body.has-motion [data-hero-line] { transform: translateY(110%); }
body.has-motion [data-split] { visibility: hidden; }

/* =============================================================================
   1. Hero：滿版靜態圖片輪播，文案固定在左下，控制列在下緣
   ============================================================================= */
.anim-hero {
  position: relative;
  height: 100vh;
  height: 100svh;
  min-height: 600px;
  overflow: hidden;
  background: var(--anim-dark);
  color: var(--ds-color-on-dark);
}

.anim-hero__slides { position: absolute; inset: 0; }

.anim-hero__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity .9s var(--ds-ease), visibility 0s linear .9s;
  visibility: hidden;
}

.anim-hero__slide.is-active {
  opacity: 1;
  visibility: visible;
  transition: opacity .9s var(--ds-ease), visibility 0s;
}

.anim-hero__slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: var(--focus-x, 50%) 50%;
  transform-origin: var(--focus-x, 50%) 55%;
}

/* 推鏡：換上後朝焦點緩慢推近；淡出中的上一張（.is-leaving）沿用同一個動畫，不會跳回原尺寸 */
.anim-hero__slide.is-active img,
.anim-hero__slide.is-leaving img {
  animation: anim-push-in 7.5s linear both;
}

.anim-hero.is-held .anim-hero__slide img { animation-play-state: paused; }

@keyframes anim-push-in {
  from { transform: scale(1) translate3d(0, 0, 0); }
  to { transform: scale(1.12) translate3d(0, -1%, 0); }
}

/* 只加深左下文字區與下緣控制列，不把整張作品壓暗 */
.anim-hero__shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(8, 8, 8, .5) 0, rgba(8, 8, 8, 0) calc(var(--header-height) + 80px)),
    linear-gradient(to top, rgba(8, 8, 8, .78) 0%, rgba(8, 8, 8, .42) 22%, rgba(8, 8, 8, 0) 48%),
    radial-gradient(120% 90% at 0% 100%, rgba(8, 8, 8, .5) 0%, rgba(8, 8, 8, 0) 55%);
  pointer-events: none;
}

.anim-hero__inner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: clamp(var(--ds-space-xl), 6vh, var(--ds-space-3xl));
  padding: 0 var(--stage-gutter) clamp(var(--ds-space-md), 3.5vh, var(--ds-space-xl));
}

.anim-hero__content { max-width: 34em; }

.anim-crumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--ds-space-xs);
  margin-bottom: var(--ds-space-lg);
  color: var(--ds-color-on-dark-muted);
  font-size: var(--ds-text-caption-size);
  line-height: var(--ds-text-caption-line);
}

.anim-crumbs a { transition: color var(--ds-duration-fast) var(--ds-ease); }
.anim-crumbs a:hover { color: var(--ds-color-on-dark); }
.anim-crumbs [aria-current] { color: var(--ds-color-on-dark-strong); }

/* 章節與展示區眉標沿用元件庫 .ds-eyebrow--inline（圓球＋圓角線段）；Hero 小標用細線 */
.anim-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--ds-space-sm);
  color: var(--ds-color-on-dark-strong);
  font-size: var(--ds-text-body-sm-size);
  line-height: var(--ds-text-body-sm-line);
  font-weight: var(--ds-weight-medium);
  letter-spacing: .16em;
}

.anim-hero__eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: currentColor;
  opacity: .7;
}

.anim-hero__title {
  margin-top: var(--ds-space-md);
  color: var(--ds-color-on-dark);
  font-size: clamp(34px, 4.6vw, var(--ds-text-display-hero-size));
  line-height: 1.22;
  font-weight: var(--ds-weight-bold);
  letter-spacing: var(--ds-tracking-hero);
  text-shadow: 0 2px 24px rgba(0, 0, 0, .25);
}

.anim-hero__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ds-space-lg);
  padding-top: var(--ds-space-md);
  border-top: 1px solid rgba(255, 255, 255, .2);
}

.anim-hero__scroll {
  display: inline-flex;
  align-items: center;
  gap: var(--ds-space-sm);
  min-height: 44px;
  color: var(--ds-color-on-dark-strong);
  font-size: var(--ds-text-body-sm-size);
  letter-spacing: .12em;
}

.anim-hero__scroll:hover { color: var(--ds-color-on-dark); }

.anim-hero__scroll-line {
  position: relative;
  width: 1px;
  height: 28px;
  overflow: hidden;
  background: rgba(255, 255, 255, .25);
}

.anim-hero__scroll-line::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--ds-color-on-dark);
  transform: translateY(-100%);
  animation: anim-scroll-cue 2.4s var(--anim-ease-out) infinite;
}

@keyframes anim-scroll-cue {
  0% { transform: translateY(-100%); }
  55% { transform: translateY(0); }
  100% { transform: translateY(100%); }
}

.anim-hero__controls {
  display: flex;
  align-items: center;
  gap: var(--ds-space-lg);
  min-width: 0;
}

.anim-hero__caption {
  display: flex;
  align-items: baseline;
  gap: var(--ds-space-xs);
  min-width: 8em;
  color: var(--ds-color-on-dark);
  font-size: var(--ds-text-body-sm-size);
  font-weight: var(--ds-weight-medium);
  white-space: nowrap;
  text-align: right;
  justify-content: flex-end;
}

.anim-hero__caption-note {
  color: var(--ds-color-on-dark-muted);
  font-size: var(--ds-text-caption-size);
  font-weight: 400;
}

.anim-hero__dots { display: flex; align-items: center; }

.anim-hero__dot {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 30px;
  height: 44px;
  padding: 0 3px;
  border: 0;
  background: transparent;
}

.anim-hero__dot::before {
  content: "";
  position: absolute;
  inset: 21px 3px;
  background: rgba(255, 255, 255, .3);
  transition: background-color var(--ds-duration-fast) var(--ds-ease);
}

.anim-hero__dot:hover::before { background: rgba(255, 255, 255, .6); }

.anim-hero__dot-fill {
  position: absolute;
  inset: 21px 3px;
  background: var(--ds-color-on-dark);
  transform: scaleX(0);
  transform-origin: left center;
}

.anim-hero__dot[aria-current="true"]::before { inset-block: 20px; }
.anim-hero__dot[aria-current="true"] .anim-hero__dot-fill { inset-block: 20px; transform: scaleX(var(--fill, 1)); }

.anim-hero__buttons { display: flex; gap: var(--ds-space-xs); }

@media (max-width: 767px) {
  .anim-hero { min-height: 520px; }
  .anim-hero__shade {
    background:
      linear-gradient(to bottom, rgba(8, 8, 8, .5) 0, rgba(8, 8, 8, 0) calc(var(--header-height) + 64px)),
      linear-gradient(to top, rgba(8, 8, 8, .85) 0%, rgba(8, 8, 8, .5) 35%, rgba(8, 8, 8, 0) 65%);
  }
  .anim-hero__bar { flex-wrap: wrap; gap: var(--ds-space-xs); }
  .anim-hero__scroll { display: none; }
  .anim-hero__controls { width: 100%; justify-content: space-between; gap: var(--ds-space-sm); }
  .anim-hero__caption { display: none; }
  .anim-hero__dots { flex: 1; min-width: 0; }
  .anim-hero__dot { flex: 1; width: auto; max-width: 30px; }
}

/* =============================================================================
   2. 三段捲動動畫
   預設：章節列 → 各章「影片＋文案」依序排列（手機、減少動態、沒有 JS）。
   .is-scrub：一個 sticky 舞台＋三章疊放，影片進度對應各章自己的捲動進度。
   ============================================================================= */
.anim-chapters {
  --bar-h: 48px;
  position: relative;
  z-index: 1;
  background: var(--anim-dark);
  color: var(--ds-color-on-dark);
}

.anim-chapters__stage {
  --chapters-gap: var(--ds-space-3xl);
  display: flex;
  flex-direction: column;
  gap: var(--chapters-gap);
  padding-bottom: var(--animation-section-space);
}

.anim-chapter { scroll-margin-top: calc(var(--header-height) + 72px); }

.anim-chapter__media {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #000;
}

.anim-chapter__video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.anim-chapter__play {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--ds-space-sm);
  border: 0;
  background: rgba(0, 0, 0, .25);
  color: var(--ds-color-on-dark);
  font-size: var(--ds-text-body-sm-size);
  font-weight: var(--ds-weight-semibold);
}

.anim-chapter__play-icon,
.anim-player__play-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: clamp(56px, 6vw, 76px);
  height: clamp(56px, 6vw, 76px);
  border-radius: var(--ds-radius-full);
  background: var(--ds-color-on-dark);
  color: var(--anim-dark);
  transition: transform .5s var(--anim-ease-out);
}

.anim-chapter__play-icon .ds-icon,
.anim-player__play-icon .ds-icon { font-size: clamp(28px, 3vw, 36px); font-variation-settings: "FILL" 1; }

.anim-chapter__play:hover .anim-chapter__play-icon { transform: scale(1.08); }

.anim-chapter__text { padding: var(--ds-space-lg) var(--container-gutter) 0; max-width: 40rem; }

.anim-chapter__title {
  margin-top: var(--ds-space-sm);
  color: var(--ds-color-on-dark);
  font-size: clamp(22px, 2.2vw, 30px);
  line-height: 1.35;
  font-weight: var(--ds-weight-semibold);
  letter-spacing: var(--ds-tracking-headline);
  text-wrap: balance;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

.anim-chapter__body {
  margin-top: var(--ds-space-md);
  color: var(--ds-color-on-dark-strong);
  font-size: var(--ds-text-body-md-size);
  line-height: 1.85;
}

.anim-chapter__note {
  margin-top: var(--ds-space-md);
  padding-top: var(--ds-space-sm);
  border-top: 1px solid rgba(255, 255, 255, .18);
  color: var(--ds-color-on-dark-muted);
  font-size: var(--ds-text-body-sm-size);
}

/* 章節列：手機在區塊頂端、一般流程中；桌機逐格模式改為舞台底部控制區 */
.anim-bar {
  order: -1;
  position: relative;
  margin-bottom: calc(var(--ds-space-lg) - var(--chapters-gap));
  z-index: 3;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas: "now toggle" "track track";
  align-items: center;
  gap: var(--ds-space-xs) var(--ds-space-lg);
  padding: var(--ds-space-md) var(--container-gutter);
  border-bottom: 1px solid var(--anim-line);
  background: var(--anim-dark);
}

.anim-bar__now {
  grid-area: now;
  display: flex;
  align-items: baseline;
  gap: var(--ds-space-sm);
  min-width: 0;
  white-space: nowrap;
}

.anim-bar__now-label {
  color: var(--ds-color-on-dark-muted);
  font-size: var(--ds-text-caption-size);
  letter-spacing: .12em;
}

.anim-bar__now-name {
  color: var(--ds-color-on-dark);
  font-size: var(--ds-text-body-sm-size);
  font-weight: var(--ds-weight-semibold);
}

.anim-bar__track { grid-area: track; min-width: 0; }

.anim-bar__chapters {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.anim-bar__chapter {
  display: inline-flex;
  align-items: center;
  gap: var(--ds-space-xs);
  min-height: 40px;
  color: var(--ds-color-on-dark-muted);
  font-size: var(--ds-text-body-sm-size);
  font-weight: var(--ds-weight-medium);
  transition: color var(--ds-duration-slow) var(--ds-ease);
}

.anim-bar__chapter::before {
  content: "";
  width: 0;
  height: 1px;
  background: var(--ds-color-primary);
  transition: width var(--ds-duration-slow) var(--anim-ease-out);
}

.anim-bar__chapter:hover { color: var(--ds-color-on-dark); }
.anim-bar__chapter[aria-current="step"] { color: var(--ds-color-on-dark); font-weight: var(--ds-weight-semibold); }
.anim-bar__chapter[aria-current="step"]::before { width: 14px; }

.anim-bar__line {
  position: relative;
  height: 2px;
  margin-top: var(--ds-space-xxs);
  background:
    linear-gradient(to right, transparent calc(33.333% - 1px), rgba(255, 255, 255, .5) calc(33.333% - 1px), rgba(255, 255, 255, .5) calc(33.333% + 1px), transparent calc(33.333% + 1px)),
    linear-gradient(to right, transparent calc(66.666% - 1px), rgba(255, 255, 255, .5) calc(66.666% - 1px), rgba(255, 255, 255, .5) calc(66.666% + 1px), transparent calc(66.666% + 1px)),
    rgba(255, 255, 255, .16);
}

.anim-bar__fill {
  position: absolute;
  inset: 0;
  background: var(--ds-color-primary);
  transform: scaleX(var(--progress, 0));
  transform-origin: left center;
}

.anim-bar__dot {
  position: absolute;
  top: 50%;
  left: calc(var(--progress, 0) * 100%);
  width: 9px;
  height: 9px;
  border-radius: var(--ds-radius-full);
  background: var(--ds-color-on-dark);
  box-shadow: 0 0 0 4px rgba(0, 180, 216, .28);
  transform: translate(-50%, -50%);
}

.anim-bar__toggle {
  grid-area: toggle;
  display: inline-flex;
  align-items: center;
  gap: var(--ds-space-xs);
  min-height: 40px;
  padding: 0 var(--ds-space-md);
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: var(--ds-radius-full);
  background: transparent;
  color: var(--ds-color-on-dark-strong);
  font-size: var(--ds-text-caption-size);
  font-weight: var(--ds-weight-medium);
  white-space: nowrap;
  transition: background-color var(--ds-duration-fast) var(--ds-ease), color var(--ds-duration-fast) var(--ds-ease);
}

.anim-bar__toggle:hover { background: rgba(255, 255, 255, .1); color: var(--ds-color-on-dark); }
.anim-bar__toggle .ds-icon { font-size: 18px; }

@media (min-width: 768px) {
  .anim-chapters__stage { --chapters-gap: var(--ds-space-4xl); }
  .anim-chapter {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: center;
    gap: var(--ds-space-2xl);
    padding-inline: var(--container-gutter);
  }
  .anim-chapter__media { border-radius: var(--ds-radius-lg); }
  .anim-chapter__text { padding: 0; }
}

/* ---------- 桌機逐格捲動：sticky 舞台＋三章疊放＋底部控制區 ---------- */
.anim-chapters.is-scrub {
  --stage-h: 100vh;
  --chapter-len: 3.4;
  --chapter-hold: 1.7;
}

/* 舞台 1 + 三章 + 停留緩衝（最後一段播完後先停住）+ 最後 1 個視窗高度讓工學區疊上 */
.anim-chapters.is-scrub .anim-chapters__track {
  height: calc(var(--stage-h) * (2 + 3 * var(--chapter-len) + var(--chapter-hold)));
}

.anim-chapters.is-scrub .anim-chapters__stage {
  position: sticky;
  top: 0;
  display: block;
  height: var(--stage-h);
  padding: 0;
  overflow: hidden;
  border-radius: calc(var(--cover, 0) * var(--ds-radius-lg) * 2);
  transform: scale(calc(1 - var(--cover, 0) * .06));
  transform-origin: center top;
}

/* 被工學區蓋上時的壓暗層 */
.anim-chapters.is-scrub .anim-chapters__stage::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 5;
  background: #000;
  opacity: calc(var(--cover, 0) * .55);
  pointer-events: none;
}

/* 工學區上移一個視窗高度，疊在仍釘住的捲動舞台上 */
.anim-chapters.is-scrub + .anim-eng { margin-top: -100vh; }

.anim-chapters.is-scrub .anim-chapter {
  position: absolute;
  inset: 0;
  display: block;
  padding: 0;
  pointer-events: none;
}

.anim-chapters.is-scrub .anim-chapter.is-current { pointer-events: auto; }

.anim-chapters.is-scrub .anim-chapter__media {
  position: absolute;
  inset: 0;
  aspect-ratio: auto;
  border-radius: 0;
  opacity: var(--media-opacity, 0);
  will-change: opacity;
}

/* 文案背後只做局部由深至透明的漸層 */
.anim-chapters.is-scrub .anim-chapter__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(85% 95% at 0% 100%, rgba(6, 6, 6, .82) 0%, rgba(6, 6, 6, .55) 35%, rgba(6, 6, 6, 0) 68%),
    linear-gradient(to right, rgba(6, 6, 6, .35) 0%, rgba(6, 6, 6, 0) 50%),
    linear-gradient(to top, rgba(6, 6, 6, .6) 0, rgba(6, 6, 6, 0) calc(var(--bar-h) + 80px));
  pointer-events: none;
}

.anim-chapters.is-scrub .anim-chapter__text {
  position: absolute;
  left: var(--stage-gutter);
  bottom: calc(var(--bar-h) + clamp(28px, 5vh, 56px));
  z-index: 2;
  width: min(540px, 42vw);
  max-width: none;
  padding: 0;
  opacity: var(--text-opacity, 0);
  transform: translateY(var(--text-y, 12px));
  text-shadow: 0 1px 14px rgba(0, 0, 0, .45);
  will-change: opacity, transform;
}

.anim-chapters.is-scrub .anim-chapter__title { font-size: clamp(24px, 2.3vw, 34px); }
.anim-chapters.is-scrub .anim-chapter__body { text-wrap: balance; word-break: keep-all; overflow-wrap: anywhere; }

.anim-chapters.is-scrub .anim-chapter--end .anim-chapter__text { left: auto; right: var(--stage-gutter); width: min(400px, 28vw); }

.anim-chapters.is-scrub .anim-chapter--end .anim-chapter__media::after {
  background:
    radial-gradient(85% 95% at 100% 100%, rgba(6, 6, 6, .82) 0%, rgba(6, 6, 6, .55) 35%, rgba(6, 6, 6, 0) 68%),
    linear-gradient(to left, rgba(6, 6, 6, .35) 0%, rgba(6, 6, 6, 0) 50%),
    linear-gradient(to top, rgba(6, 6, 6, .6) 0, rgba(6, 6, 6, 0) calc(var(--bar-h) + 80px));
}

.anim-chapters.is-scrub .anim-chapter__note {
  max-width: 24em;
  border-top-color: rgba(255, 255, 255, .24);
}

/* 底部章節列：細線與小字，背景交給影片底部的漸層，不另加色塊 */
.anim-chapters.is-scrub .anim-bar {
  position: absolute;
  inset: auto 0 0;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-areas: "now track toggle";
  gap: var(--ds-space-lg);
  height: var(--bar-h);
  padding: 0 var(--stage-gutter) var(--ds-space-xxs);
  margin: 0;
  border: 0;
  background: none;
}

.anim-chapters.is-scrub .anim-bar__now { min-width: 9.5em; gap: var(--ds-space-xs); }
.anim-chapters.is-scrub .anim-bar__now-label { font-size: 11px; letter-spacing: .14em; }
.anim-chapters.is-scrub .anim-bar__now-name { font-size: var(--ds-text-caption-size); }
.anim-chapters.is-scrub .anim-bar__chapter { min-height: 24px; font-size: var(--ds-text-caption-size); }
.anim-chapters.is-scrub .anim-bar__chapter[aria-current="step"]::before { width: 10px; }
.anim-chapters.is-scrub .anim-bar__line { height: 1px; margin-top: 2px; }
.anim-chapters.is-scrub .anim-bar__dot { width: 7px; height: 7px; box-shadow: 0 0 0 3px rgba(0, 180, 216, .3); }

.anim-chapters.is-scrub .anim-bar__toggle {
  justify-content: center;
  width: 32px;
  min-height: 32px;
  padding: 0;
  border-color: rgba(255, 255, 255, .24);
}

.anim-chapters.is-scrub .anim-bar__toggle .ds-icon { font-size: 16px; }

.anim-chapters.is-scrub .anim-bar__toggle-label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* 捲動區佔滿視窗時收起頂部導覽（上下捲動皆同），鍵盤聚焦導覽時再露出 */
.animation-page .ds-site-header { transition: transform .45s var(--anim-ease-out); }

.animation-page.is-immersive .ds-site-header:not(:focus-within) {
  transform: translateY(-100%);
}

/* 矮視窗：縮小留白與字級，仍放不下時由 JS 退回一般排版 */
@media (max-height: 760px) {
  .anim-chapters.is-scrub .anim-chapter__title { font-size: clamp(22px, 2vw, 28px); }
  .anim-chapters.is-scrub .anim-chapter__body { font-size: var(--ds-text-body-sm-size); line-height: 1.75; }
  .anim-chapters.is-scrub .anim-chapter__note { display: none; }
}

/* =============================================================================
   3. 3D 工學動畫：淺色引言頁片 → 雙色展示舞台
   整區以圓角頂邊的淺色頁片由下方疊上；桌機逐格模式下，捲動舞台在被蓋上的過程中保持釘住，
   並由 js/marketing-animation.js 依覆蓋進度微縮、壓暗（見捲動區 --cover）；
   展示舞台右側延續同一淺色，左側深色塊為右緣圓角的獨立色塊，影片跨越色塊交界。
   桌機：左上目前片名與上一段／下一段，右上分類與片名子選單，下方大影片＋右側當前影片介紹。
   手機：深色片名帶 → 分類與子選單 → 播放器 → 介紹 → 上一段／下一段。自然高度，不硬塞一屏。
   ============================================================================= */
.anim-eng {
  --anim-deep: var(--ds-color-surface-dark);
  --anim-warm: var(--ds-color-surface-inner);
  --sheet-radius: clamp(20px, 3vw, 40px);
  position: relative;
  z-index: 2;
  margin-top: calc(var(--sheet-radius) * -1);
  border-radius: var(--sheet-radius) var(--sheet-radius) 0 0;
  background: var(--anim-warm);
  box-shadow: 0 -24px 60px -20px rgba(0, 0, 0, .35);
  scroll-margin-top: var(--header-height);
}

.anim-eng__intro {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: calc(var(--animation-section-space) + var(--sheet-radius)) var(--container-gutter) clamp(var(--ds-space-3xl), 8vw, 128px);
}

.anim-eng__head { display: grid; gap: var(--ds-space-lg); }

/* 大字標題：字重降到 500、行高 1.42 並略加字距，維持呼吸感 */
.anim-eng__title {
  margin-top: var(--ds-space-xs);
  color: var(--ds-color-action-ink);
  font-size: clamp(34px, 5vw, 72px);
  line-height: 1.42;
  font-weight: var(--ds-weight-medium);
  letter-spacing: .02em;
}

.anim-eng__lead {
  max-width: 30em;
  color: var(--ds-color-text-secondary);
  font-size: var(--ds-text-body-md-size);
  line-height: 1.95;
}

.anim-uses {
  display: grid;
  gap: var(--ds-space-2xl);
  margin-top: clamp(var(--ds-space-3xl), 7vw, 112px);
}

.anim-use {
  position: relative;
  padding-top: var(--ds-space-xl);
}

/* 頂端細線：進場時由 JS 以 --use-line 0 → 1 由左畫出 */
.anim-use::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  background: rgba(17, 17, 17, .14);
  transform: scaleX(var(--use-line, 1));
  transform-origin: left center;
}

.anim-use__label {
  display: flex;
  align-items: center;
  gap: var(--ds-space-xs);
  color: var(--ds-color-text-secondary);
  font-size: var(--ds-text-caption-size);
  letter-spacing: .16em;
}

.anim-use__label::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--ds-color-primary);
}

.anim-use__title {
  margin-top: var(--ds-space-md);
  color: var(--ds-color-text-primary);
  font-size: clamp(20px, 1.7vw, 24px);
  line-height: 1.45;
  font-weight: var(--ds-weight-semibold);
  word-break: keep-all;
  overflow-wrap: anywhere;
}

.anim-use__text {
  margin-top: var(--ds-space-md);
  color: var(--ds-color-text-secondary);
  font-size: var(--ds-text-body-sm-size);
  line-height: 1.95;
}

@media (min-width: 900px) {
  .anim-uses { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--ds-space-2xl); }
}

/* 桌機：標題三行階梯式內縮，引言對齊最後一行置右 */
@media (min-width: 1024px) {
  .anim-eng__head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 26rem);
    align-items: end;
    gap: 0 var(--ds-space-3xl);
  }
  .anim-eng__eyebrow { grid-column: 1 / -1; grid-row: 1; }
  .anim-eng__title { grid-column: 1 / -1; grid-row: 2; margin-top: var(--ds-space-lg); }
  .anim-eng__title > span { display: block; }
  .anim-eng__title > span:nth-child(2) { padding-left: 1.5em; }
  .anim-eng__title > span:nth-child(3) { padding-left: 3em; }
  .anim-eng__lead { grid-column: 2; grid-row: 3; justify-self: end; margin-top: var(--ds-space-2xl); }
}

@media (min-width: 1280px) {
  /* 引言上移與標題最後一行並排；標題本身不受影響 */
  .anim-eng__lead { grid-row: 2; margin-top: 0; padding-bottom: .5em; }
  .anim-eng__title { grid-column: 1; }
  .anim-eng__title > span { white-space: nowrap; }
}

/* ---------- 展示舞台 ---------- */
.anim-showroom {
  position: relative;
  background: var(--anim-warm);
  color: var(--ds-color-text-secondary);
}

.anim-showroom__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 0 var(--container-gutter) var(--animation-section-space);
}

.anim-showroom__current {
  order: 1;
  margin-inline: calc(var(--container-gutter) * -1);
  padding: var(--ds-space-lg) var(--container-gutter) var(--ds-space-xl);
  border-radius: 0 var(--sheet-radius) var(--sheet-radius) 0;
  margin-right: 0;
  background: var(--anim-deep);
  color: var(--ds-color-on-dark);
}

.anim-showroom__name {
  margin-top: var(--ds-space-sm);
  word-break: keep-all;
  overflow-wrap: anywhere;
  overflow: hidden;
  color: var(--ds-color-on-dark);
  font-size: clamp(26px, 2.6vw, 40px);
  line-height: 1.3;
  font-weight: var(--ds-weight-semibold);
  letter-spacing: var(--ds-tracking-headline);
}

.anim-showroom__name-text { display: inline-block; }

.anim-showroom__steps {
  order: 4;
  display: flex;
  gap: var(--ds-space-lg);
  margin-top: var(--ds-space-xl);
}

.anim-showroom__steps[hidden] { display: none; }

.anim-step {
  display: inline-flex;
  align-items: center;
  gap: var(--ds-space-xs);
  min-height: 44px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--ds-color-text-primary);
  font-size: var(--ds-text-body-sm-size);
  font-weight: var(--ds-weight-medium);
  letter-spacing: .06em;
  transition: opacity var(--ds-duration-fast) var(--ds-ease), gap var(--ds-duration-slow) var(--anim-ease-out);
}

.anim-step .ds-icon { font-size: 18px; }
.anim-step:not(:disabled):hover { gap: var(--ds-space-sm); }
.anim-step:disabled { opacity: .3; cursor: not-allowed; }

.anim-showroom__nav { order: 2; padding-top: var(--ds-space-lg); }

.anim-showroom__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ds-space-xxs) var(--ds-space-lg);
  border-bottom: 1px solid rgba(17, 17, 17, .12);
}

.anim-showroom__tab {
  position: relative;
  min-height: 44px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--ds-color-text-secondary);
  font-size: var(--ds-text-body-md-size);
  font-weight: var(--ds-weight-medium);
  transition: color var(--ds-duration-fast) var(--ds-ease);
}

.anim-showroom__tab::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px;
  height: 2px;
  background: var(--ds-color-secondary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--ds-duration-slow) var(--anim-ease-out);
}

.anim-showroom__tab:hover { color: var(--ds-color-text-primary); }
.anim-showroom__tab[aria-selected="true"] { color: var(--ds-color-text-primary); font-weight: var(--ds-weight-semibold); }
.anim-showroom__tab[aria-selected="true"]::after { transform: scaleX(1); }

.anim-showroom__sub {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ds-space-xxs) var(--ds-space-lg);
  margin-top: var(--ds-space-sm);
}

.anim-showroom__clip {
  min-height: 40px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--ds-color-text-secondary);
  font-size: var(--ds-text-body-sm-size);
  text-align: left;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 6px;
  transition: color var(--ds-duration-fast) var(--ds-ease), text-decoration-color var(--ds-duration-fast) var(--ds-ease);
}

.anim-showroom__clip:hover { color: var(--ds-color-text-primary); }

.anim-showroom__clip[aria-pressed="true"] {
  color: var(--ds-color-text-primary);
  font-weight: var(--ds-weight-semibold);
  text-decoration-color: currentColor;
}

.anim-showroom__panel { order: 3; display: grid; gap: var(--ds-space-xl); margin-top: var(--ds-space-xl); }

.anim-player {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--ds-radius-lg);
  background: #000;
  box-shadow: 0 40px 80px -36px rgba(8, 12, 16, .55), 0 12px 24px -12px rgba(8, 12, 16, .3);
}

/* 完整保留原比例，不裁掉剖面、管線與字幕 */
.anim-player__poster,
.anim-player__ghost,
.anim-player__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.anim-player__ghost { pointer-events: none; }

.anim-player__video {
  z-index: 2;
  background: #000;
  opacity: 0;
  transition: opacity .5s var(--ds-ease);
}

.anim-player__video.is-visible { opacity: 1; }
.anim-player.is-playing .anim-player__play { visibility: hidden; }

.anim-player__play {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--ds-space-sm);
  background: radial-gradient(circle at center, rgba(0, 0, 0, .35), rgba(0, 0, 0, .05) 60%);
  color: var(--ds-color-on-dark);
}

.anim-player__play:hover .anim-player__play-icon { transform: scale(1.08); }
.anim-player__play:focus-visible { outline: 2px solid var(--ds-color-primary); outline-offset: -4px; border-radius: var(--ds-radius-lg); }

.anim-player__play-label {
  font-size: var(--ds-text-body-sm-size);
  font-weight: var(--ds-weight-semibold);
  text-shadow: 0 1px 10px rgba(0, 0, 0, .6);
}

.anim-player__play-label span::before { content: "："; }

/* 八段介紹疊在同一格，高度取最長的一段，切換時版面不跳動；只顯示目前這段 */
.anim-showroom__copies { display: grid; align-content: start; }

.anim-showroom__copy {
  grid-area: 1 / 1;
  visibility: hidden;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .5s var(--ds-ease), transform .6s var(--anim-ease-out), visibility 0s linear .5s;
}

.anim-showroom__copy.is-current {
  visibility: visible;
  opacity: 1;
  transform: none;
  transition: opacity .6s var(--ds-ease) .1s, transform .8s var(--anim-ease-out) .1s, visibility 0s;
}

.anim-showroom__copy-name {
  padding-bottom: var(--ds-space-md);
  border-bottom: 1px solid rgba(17, 17, 17, .14);
  color: var(--ds-color-text-secondary);
  font-size: var(--ds-text-caption-size);
  letter-spacing: .12em;
}

.anim-showroom__copy-name span { margin-inline: var(--ds-space-xxs); opacity: .5; }

.anim-showroom__headline {
  margin-top: var(--ds-space-lg);
  word-break: keep-all;
  overflow-wrap: anywhere;
  color: var(--ds-color-text-primary);
  font-size: clamp(20px, 1.7vw, 24px);
  line-height: 1.5;
  font-weight: var(--ds-weight-semibold);
  text-wrap: balance;
}

.anim-showroom__text {
  margin-top: var(--ds-space-md);
  color: var(--ds-color-text-secondary);
  font-size: var(--ds-text-body-sm-size);
  line-height: 1.95;
}

.anim-showroom :focus-visible { outline: 2px solid var(--ds-color-secondary); outline-offset: 3px; }

/* 桌機：24 欄格線，左上片名、右上分類，影片自標題區內縮一欄並跨過色塊交界 */
@media (min-width: 1024px) {
  .anim-showroom::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: calc((100% - min(100%, var(--container-max))) / 2 + min(100%, var(--container-max)) * .4);
    border-radius: 0 var(--sheet-radius) var(--sheet-radius) 0;
    background: var(--anim-deep);
  }

  .anim-showroom__inner {
    display: grid;
    grid-template-columns: repeat(24, minmax(0, 1fr));
    column-gap: var(--ds-space-md);
    align-items: start;
    padding-top: var(--ds-space-lg);
  }

  .anim-showroom__current {
    grid-column: 1 / 10;
    grid-row: 1;
    margin: 0;
    padding: 0;
    background: none;
  }

  .anim-showroom__steps { grid-column: 1 / 10; grid-row: 2; margin-top: var(--ds-space-md); }
  .anim-showroom__steps .anim-step { color: var(--ds-color-on-dark); }

  .anim-showroom__nav {
    grid-column: 12 / 25;
    grid-row: 1 / 3;
    align-self: start;
    padding-top: var(--ds-space-md);
  }

  .anim-showroom__tabs,
  .anim-showroom__sub { justify-content: flex-end; }

  .anim-showroom__tabs { column-gap: var(--ds-space-xl); }

  .anim-showroom__panel {
    grid-column: 1 / 25;
    grid-row: 3;
    grid-template-columns: repeat(24, minmax(0, 1fr));
    column-gap: var(--ds-space-md);
    margin-top: clamp(var(--ds-space-2xl), 5vw, var(--ds-space-3xl));
  }

  .anim-player { grid-column: 2 / 17; }
  .anim-showroom__copies { grid-column: 18 / 25; }
}

/* =============================================================================
   4. 案例：版面與舊版相同
   ============================================================================= */
.animation-section-head { max-width: 46rem; }
.animation-section-head__title { margin-block: var(--ds-space-sm) var(--ds-space-md); }

@media (min-width: 768px) {
  .animation-section-head__title > span { display: block; }
}

.animation-cases { padding-block: var(--animation-section-space); }

.animation-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--ds-space-xl);
  margin-top: var(--ds-space-2xl);
}

@media (max-width: 1023px) { .animation-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--ds-space-lg); } }
@media (max-width: 599px) { .animation-grid { grid-template-columns: 1fr; } }

.animation-card { justify-content: flex-start; color: inherit; }

/* 案例卡進場只漸入、不位移（沒有 GSAP 時走 [data-reveal] 的 CSS 轉場） */
.animation-card[data-reveal] { transform: none; }

.animation-card:hover { border-color: var(--ds-color-primary-55); box-shadow: var(--ds-shadow-cyan); }
.animation-card:focus-visible { outline: none; box-shadow: var(--ds-shadow-focus); }

.animation-card__media { display: block; aspect-ratio: 16 / 9; overflow: hidden; background: var(--ds-color-surface-inner); }

.animation-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--ds-duration-media) var(--ds-ease);
}

.animation-card:hover .animation-card__media img { transform: scale(1.05); }

.animation-card__body {
  display: flex;
  flex: 1;
  flex-direction: column;
  align-items: flex-start;
  padding: var(--ds-space-md) var(--ds-space-lg) var(--ds-space-xs);
}

.animation-card__tags { display: flex; flex-wrap: wrap; gap: var(--ds-space-xs); }

.animation-card__title { display: block; margin-top: var(--ds-space-sm); }

.animation-card__more { margin-top: auto; padding-top: var(--ds-space-xs); }
.animation-card:hover .animation-card__more { color: var(--ds-color-secondary-hover); }
.animation-card:hover .animation-card__more .ds-icon { transform: translateX(4px); }

/* =============================================================================
   5. CTA：深色底＋單張低干擾的作品局部
   ============================================================================= */
.anim-cta {
  position: relative;
  display: flex;
  align-items: center;
  min-height: clamp(440px, 70vh, 680px);
  overflow: hidden;
  background: var(--anim-dark);
  color: var(--ds-color-on-dark);
}

.anim-cta__media { position: absolute; inset: 0; }

.anim-cta__media img {
  position: absolute;
  top: -10%;
  left: 0;
  width: 100%;
  height: 120%;
  object-fit: cover;
  opacity: .42;
}

.anim-cta__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(10, 10, 10, .92) 0%, rgba(10, 10, 10, .6) 45%, rgba(10, 10, 10, .2) 100%);
}

.anim-cta__inner {
  position: relative;
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--animation-section-space) var(--container-gutter);
}

.anim-cta__title {
  color: var(--ds-color-on-dark);
  font-size: var(--ds-text-headline-lg-size);
  line-height: var(--ds-text-headline-lg-line);
  font-weight: var(--ds-text-headline-lg-weight);
  letter-spacing: var(--ds-tracking-headline);
}

@media (min-width: 768px) {
  .anim-cta__title > span { display: block; }
}

.anim-cta__text {
  max-width: 32em;
  margin-top: var(--ds-space-lg);
  color: var(--ds-color-on-dark-strong);
  line-height: 1.85;
}

.anim-cta__button { margin-top: var(--ds-space-xl); }
.anim-cta__button .ds-icon { transition: transform var(--ds-duration-slow) var(--anim-ease-out); }
.anim-cta__button:hover .ds-icon { transform: translateX(4px); }

/* =============================================================================
   減少動態效果：關閉轉場與裝飾動畫，內容直接可見
   ============================================================================= */
@media (prefers-reduced-motion: reduce) {
  .animation-page [data-reveal] { transition: none; opacity: 1; transform: none; }
  .anim-hero__slide,
  .anim-hero__slide.is-active,
  .anim-hero__slide img,
  .anim-player__video,
  .anim-showroom__copy,
  .anim-showroom__copy.is-current,
  .animation-page .animation-card__media img { transition: none; }
  .anim-hero__slide.is-active img,
  .anim-hero__slide.is-leaving img { animation: none; }
  .anim-hero__scroll-line::after { animation: none; transform: none; }
}