/* ================================================================
   MUSEUM HTML PRESENTATION — PHASE 1 VISUAL SYSTEM
   Source of truth: museum_design_system.md
   All slide measurements are authored for a fixed 1920×1080 stage.
   ================================================================ */

/* === DESIGN TOKENS === */
:root {
  --paper: #f4efe6;
  --paper-highlight: #fbf8f2;
  --ink: #222222;
  --bronze: #b08a52;
  --bronze-light: #d5bd93;
  --history-red: #7a3028;
  --charcoal: #343434;
  --archive-gray: #cfc6b8;
  --dark-brown: #2a241f;
  --stage-bg: #171513;
  --slide-bg: var(--paper);

  --font-display-zh: "Noto Serif SC", serif;
  --font-body-zh: "Noto Sans SC", sans-serif;
  --font-display-en: "Cormorant Garamond", serif;
  --font-label-en: "IBM Plex Sans", sans-serif;

  --hero-size: 132px;
  --title-size: 82px;
  --lead-size: 38px;
  --body-size: 28px;
  --caption-size: 21px;
  --micro-size: 17px;

  --safe-x: 120px;
  --safe-top: 88px;
  --safe-bottom: 80px;
  --space-xs: 8px;
  --space-sm: 24px;
  --space-md: 40px;
  --space-lg: 64px;
  --space-xl: 96px;
  --space-2xl: 144px;

  --ease-museum: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 360ms;
  --duration-base: 700ms;
  --duration-slow: 1200ms;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

button {
  color: inherit;
}

/* ===========================================
   FIXED 16:9 STAGE: MANDATORY BASE STYLES
   Included in full from frontend-slides/viewport-base.css.
   =========================================== */

/* 1. Lock the browser viewport */
html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    overflow: hidden;
    background: var(--stage-bg, #000);
}

/* 2. Full-window deck viewport */
.deck-viewport {
    position: fixed;
    inset: 0;
    overflow: hidden;
    background: var(--stage-bg, #000);
}

/* 3. Fixed 16:9 design canvas.
   JavaScript sets transform: translate(...) scale(...). */
.deck-stage {
    position: absolute;
    left: 0;
    top: 0;
    width: 1920px;
    height: 1080px;
    overflow: hidden;
    transform-origin: 0 0;
    background: var(--slide-bg, #fff);
}

/* 4. Slides stack inside the fixed stage.
   Content must be laid out at 1920×1080, not reflowed per device. */
.slide {
    position: absolute;
    inset: 0;
    width: 1920px;
    height: 1080px;
    overflow: hidden;
    display: block;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    background: var(--slide-bg, #fff);
}

.slide.active,
.slide.visible {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    z-index: 1;
}

/* 5. Keep media inside authored slide bounds */
img,
video,
canvas,
svg {
    max-width: 100%;
    max-height: 100%;
}

/* 6. Presentation chrome stays outside the slide design system */
.deck-controls {
    position: fixed;
    left: 50%;
    bottom: 22px;
    transform: translateX(-50%);
    z-index: 1000;
}

/* 7. Print one fixed-size slide per page */
@media print {
    html,
    body {
        width: 1920px;
        height: auto;
        overflow: visible;
        background: #fff;
    }

    .deck-viewport {
        position: static;
        overflow: visible;
        background: #fff;
    }

    .deck-stage {
        position: static;
        width: auto;
        height: auto;
        transform: none !important;
        background: none;
    }

    .slide {
        position: relative;
        display: block !important;
        visibility: visible !important;
        opacity: 1 !important;
        pointer-events: auto !important;
        width: 1920px;
        height: 1080px;
        break-after: page;
        page-break-after: always;
    }

    .slide:last-child {
        break-after: auto;
        page-break-after: auto;
    }

    .deck-controls {
        display: none !important;
    }
}

/* 8. Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.2s !important;
    }
}

/* === GLOBAL TYPOGRAPHY === */
body {
  color: var(--ink);
  font-family: var(--font-body-zh);
  font-size: var(--body-size);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.slide {
  background-color: var(--paper);
  color: var(--ink);
  transition: opacity var(--duration-base) var(--ease-museum),
              visibility 0s linear var(--duration-base);
}

.slide.active,
.slide.visible {
  transition-delay: 0s;
}

.slide--dark {
  --slide-bg: var(--dark-brown);
  background-color: var(--dark-brown);
  color: var(--paper);
}

.slide-shell {
  width: 100%;
  height: 100%;
  padding: var(--safe-top) var(--safe-x) var(--safe-bottom);
  position: relative;
}

.slide-title,
.display-title {
  margin: 0;
  max-width: 1320px;
  font-family: var(--font-display-zh);
  font-weight: 600;
  letter-spacing: -0.035em;
}

.display-title {
  font-size: var(--hero-size);
  line-height: 1.05;
}

.display-title--timeline {
  font-family: var(--font-display-en), var(--font-display-zh);
  letter-spacing: -0.025em;
}

.slide-title {
  font-size: var(--title-size);
  line-height: 1.12;
}

.slide-eyebrow {
  color: var(--bronze);
  font-family: var(--font-label-en);
  font-size: var(--micro-size);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

/* === PHASE 1 FRAMEWORK PLACEHOLDERS === */
.framework-placeholder {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: var(--space-md);
  background-image:
    linear-gradient(90deg, transparent 0, transparent 119px, rgba(176, 138, 82, 0.18) 120px, transparent 121px),
    linear-gradient(0deg, transparent 0, transparent 79px, rgba(176, 138, 82, 0.12) 80px, transparent 81px);
}

.framework-placeholder::after {
  content: "";
  position: absolute;
  right: 120px;
  top: 88px;
  width: 420px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--bronze));
  opacity: 0.55;
}

.framework-note {
  margin: 8px 0 0;
  color: color-mix(in srgb, currentColor 48%, transparent);
  font-size: var(--caption-size);
  letter-spacing: 0.04em;
}

/* === REUSABLE PHASE 2 LAYOUT PRIMITIVES === */
.layout-split-5-7,
.layout-split-7-5,
.layout-split-4-8,
.layout-triple {
  display: grid;
  width: 100%;
  height: 100%;
  gap: 32px;
}

.layout-split-5-7 { grid-template-columns: 5fr 7fr; }
.layout-split-7-5 { grid-template-columns: 7fr 5fr; }
.layout-split-4-8 { grid-template-columns: 4fr 8fr; }
.layout-triple { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--archive-gray);
}

.media-frame > img,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--contain > img,
.media-frame--contain > video {
  object-fit: contain;
}

.museum-rule {
  width: 96px;
  height: 2px;
  background: var(--bronze);
}

.museum-caption {
  font-family: var(--font-label-en), var(--font-body-zh);
  font-size: var(--caption-size);
  line-height: 1.5;
  color: color-mix(in srgb, currentColor 58%, transparent);
}

/* === SHARED FORMAL SLIDE ELEMENTS === */
.slide-folio {
  position: absolute;
  top: 62px;
  right: 72px;
  z-index: 20;
  color: color-mix(in srgb, currentColor 42%, transparent);
  font-family: var(--font-label-en);
  font-size: var(--micro-size);
  letter-spacing: 0.12em;
}

.content-column {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  min-width: 0;
  padding-top: 32px;
}

.content-column--center {
  justify-content: center;
  padding-top: 0;
}

.lead-copy {
  max-width: 680px;
  margin: 36px 0 0;
  font-size: var(--lead-size);
  font-weight: 400;
  line-height: 1.58;
  letter-spacing: 0.01em;
}

figure {
  margin: 0;
}

figure figcaption {
  font-size: var(--caption-size);
  line-height: 1.45;
}

.keyword-row,
.experience-tags,
.group-strength,
.pillar-values {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.keyword-row span,
.experience-tags span,
.group-strength span,
.pillar-values span {
  padding: 12px 18px;
  border-top: 1px solid currentColor;
  font-size: var(--caption-size);
  letter-spacing: 0.08em;
}

/* === 01 COVER === */
.slide-cover {
  background: var(--dark-brown);
}

.cover-image,
.cover-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.cover-image {
  object-fit: cover;
  object-position: 57% center;
  filter: saturate(0.54) sepia(0.14) brightness(0.64) contrast(1.08);
}

.cover-shade {
  background:
    linear-gradient(90deg, rgba(31, 27, 23, 0.96) 0%, rgba(31, 27, 23, 0.78) 38%, rgba(31, 27, 23, 0.22) 72%, rgba(31, 27, 23, 0.18) 100%),
    linear-gradient(0deg, rgba(25, 22, 19, 0.48), transparent 52%);
}

.cover-content {
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.cover-title {
  margin: 34px 0 0;
  font-family: var(--font-display-zh);
  font-size: 142px;
  font-weight: 600;
  line-height: 1.03;
  letter-spacing: -0.05em;
}

.cover-subtitle {
  margin: 40px 0 0;
  color: rgba(244, 239, 230, 0.7);
  font-size: 25px;
  line-height: 1.65;
  letter-spacing: 0.07em;
}

.cover-axis {
  position: absolute;
  right: 124px;
  bottom: 112px;
  display: flex;
  align-items: center;
  width: 650px;
  color: var(--bronze-light);
  font-family: var(--font-display-en), var(--font-display-zh);
  font-size: 44px;
  letter-spacing: 0.02em;
}

.cover-axis i {
  flex: 1;
  height: 1px;
  margin: 0 18px;
  background: currentColor;
}

/* === 02 POSITIONING === */
.slide-positioning .layout-split-5-7 {
  grid-template-columns: 5fr 7fr;
  gap: 72px;
}

.slide-positioning .slide-title {
  margin-top: 36px;
}

.slide-positioning .lead-copy {
  max-width: 610px;
  font-size: 32px;
}

.slide-positioning .museum-caption {
  margin-top: 54px;
  padding-top: 22px;
  border-top: 1px solid var(--bronze);
  color: var(--history-red);
}

.positioning-visual {
  position: relative;
  min-width: 0;
  overflow: hidden;
}

.positioning-visual > img {
  position: absolute;
  right: 0;
  top: 0;
  width: 52%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: grayscale(0.72) sepia(0.17) contrast(0.92);
  opacity: 0.34;
}

.positioning-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--paper) 4%, transparent 66%);
}

.positioning-sequence {
  position: absolute;
  z-index: 2;
  left: 70px;
  top: 80px;
  bottom: 80px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.positioning-sequence::before {
  content: "";
  position: absolute;
  left: 27px;
  top: 54px;
  bottom: 54px;
  width: 1px;
  background: var(--bronze);
}

.positioning-sequence article {
  position: relative;
  display: grid;
  grid-template-columns: 116px 220px;
  grid-template-rows: auto auto;
  align-items: baseline;
}

.positioning-sequence article::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 25px;
  width: 15px;
  height: 15px;
  border: 3px solid var(--paper);
  border-radius: 50%;
  background: var(--bronze);
  box-shadow: 0 0 0 1px var(--bronze);
}

.positioning-sequence b {
  font-family: var(--font-display-en), var(--font-display-zh);
  font-size: 52px;
  font-weight: 500;
}

.positioning-sequence span {
  font-family: var(--font-display-zh);
  font-size: 34px;
}

.positioning-sequence small {
  grid-column: 2;
  color: rgba(34, 34, 34, 0.56);
  font-size: 20px;
  letter-spacing: 0.04em;
}

/* === 03 CONCEPT === */
.concept-ghost {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 1200px;
  height: 690px;
  object-fit: cover;
  object-position: bottom right;
  mix-blend-mode: screen;
  opacity: 0.12;
  filter: grayscale(1) sepia(0.25);
}

.concept-content {
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.concept-content .slide-title {
  margin-top: 34px;
}

.concept-statement {
  margin: 52px 0 0 340px;
  color: var(--bronze-light);
  font-family: var(--font-display-zh);
  font-size: 44px;
  line-height: 1.72;
}

.concept-translation {
  position: absolute;
  left: 120px;
  bottom: 92px;
  display: flex;
  align-items: center;
  color: rgba(244, 239, 230, 0.58);
  font-size: 21px;
  letter-spacing: 0.1em;
}

.concept-translation i {
  width: 84px;
  height: 1px;
  margin: 0 22px;
  background: var(--bronze);
}

/* === 04 CORE TIMELINE === */
.slide-timeline .slide-eyebrow {
  position: absolute;
  left: 120px;
  top: 90px;
}

.timeline-thesis {
  position: absolute;
  right: 120px;
  top: 88px;
  margin: 0;
  font-family: var(--font-display-zh);
  font-size: 30px;
  color: rgba(34, 34, 34, 0.58);
}

.timeline-track {
  position: absolute;
  left: 150px;
  right: 70px;
  top: 580px;
  height: 2px;
  background: linear-gradient(90deg, var(--ink) 0 30%, var(--history-red) 47%, var(--bronze) 70%, transparent 100%);
  transform-origin: left center;
}

.timeline-era {
  position: absolute;
  top: 200px;
  width: 500px;
}

.timeline-era::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 368px;
  width: 17px;
  height: 17px;
  border: 5px solid var(--paper);
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 1px currentColor;
}

.timeline-era--1902 { left: 120px; color: var(--ink); }
.timeline-era--1997 { left: 720px; color: var(--history-red); }
.timeline-era--future { left: 1325px; width: 480px; color: var(--bronze); }

.timeline-image {
  width: 430px;
  height: 245px;
  overflow: hidden;
  background: var(--archive-gray);
}

.timeline-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.62) sepia(0.08);
}

.timeline-image--crop img { object-position: center 58%; }

.timeline-era b {
  display: block;
  margin-top: 98px;
  font-family: var(--font-display-en), var(--font-display-zh);
  font-size: 116px;
  font-weight: 500;
  line-height: 0.9;
  letter-spacing: -0.04em;
}

.timeline-era h2 {
  margin: 25px 0 0;
  color: var(--ink);
  font-family: var(--font-display-zh);
  font-size: 38px;
  font-weight: 600;
}

.timeline-era p {
  margin: 9px 0 0;
  color: rgba(34, 34, 34, 0.48);
  font-size: 21px;
  letter-spacing: 0.12em;
}

/* === 05 SPATIAL STRATEGY === */
.slide-strategy .slide-title {
  margin-top: 34px;
}

.strategy-list {
  width: 100%;
  margin-top: 64px;
}

.strategy-list article {
  display: grid;
  grid-template-columns: 56px 1fr;
  grid-template-rows: auto auto;
  padding: 24px 0;
  border-top: 1px solid var(--archive-gray);
}

.strategy-list b {
  grid-row: 1 / 3;
  color: var(--bronze);
  font-family: var(--font-display-en);
  font-size: 25px;
}

.strategy-list h3,
.strategy-list p {
  margin: 0;
}

.strategy-list h3 {
  font-family: var(--font-display-zh);
  font-size: 29px;
}

.strategy-list p {
  margin-top: 6px;
  color: rgba(34, 34, 34, 0.5);
  font-size: 20px;
}

.strategy-plan {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: var(--paper-highlight);
}

.strategy-plan > img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.plan-overlay {
  position: absolute;
  left: 54px;
  right: 54px;
  bottom: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 15px 20px;
  background: rgba(244, 239, 230, 0.88);
  font-size: 17px;
  letter-spacing: 0.08em;
}

.plan-overlay i {
  flex: 1;
  height: 1px;
  margin: 0 16px;
  background: var(--bronze);
}

/* === 06 ENTRANCE === */
.entrance-copy {
  position: absolute;
  left: 120px;
  top: 128px;
  width: 560px;
  z-index: 3;
}

.entrance-copy .slide-title {
  margin-top: 30px;
}

.entrance-copy .lead-copy {
  font-size: 29px;
}

.entrance-copy .keyword-row { margin-top: 48px; }

.entrance-main {
  position: absolute;
  right: 120px;
  top: 88px;
  width: 1040px;
  height: 770px;
}

.entrance-main img,
.entrance-detail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.entrance-main figcaption,
.entrance-detail figcaption {
  margin-top: 12px;
  color: rgba(34, 34, 34, 0.48);
}

.entrance-detail {
  position: absolute;
  left: 540px;
  bottom: 80px;
  width: 360px;
  height: 240px;
  padding: 12px 12px 48px;
  background: var(--paper-highlight);
  box-shadow: 0 18px 45px rgba(62, 52, 42, 0.12);
  z-index: 4;
}

/* === 07 HERITAGE === */
.heritage-bg,
.heritage-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.heritage-bg {
  object-fit: cover;
  filter: saturate(0.7) brightness(0.72);
}

.heritage-shade {
  background: linear-gradient(90deg, rgba(34, 28, 23, 0.96) 0%, rgba(34, 28, 23, 0.77) 31%, rgba(34, 28, 23, 0.15) 65%, rgba(34, 28, 23, 0.06) 100%);
}

.heritage-copy {
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.heritage-copy .slide-title {
  margin-top: 34px;
}

.heritage-copy .lead-copy {
  width: 560px;
  font-size: 31px;
}

.history-years {
  position: absolute;
  left: 120px;
  right: 120px;
  bottom: 74px;
  display: flex;
  align-items: center;
  padding: 20px 30px;
  background: rgba(31, 27, 23, 0.72);
  color: var(--bronze-light);
  font-family: var(--font-display-en);
  font-size: 28px;
  backdrop-filter: blur(12px);
}

.history-years i {
  flex: 1;
  height: 1px;
  margin: 0 24px;
  background: rgba(213, 189, 147, 0.6);
}

/* === 08 IMMERSIVE CLASSROOM === */
.classroom-bg,
.classroom-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.classroom-bg {
  object-fit: cover;
  object-position: center 54%;
  filter: saturate(0.82) brightness(0.68);
}

.classroom-shade {
  background: linear-gradient(90deg, rgba(28, 24, 21, 0.97) 0%, rgba(28, 24, 21, 0.83) 29%, rgba(28, 24, 21, 0.16) 52%, rgba(28, 24, 21, 0.05) 100%);
}

.classroom-copy {
  position: relative;
  z-index: 3;
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 640px;
}

.classroom-copy .slide-title { margin-top: 34px; }
.classroom-copy .lead-copy { width: 550px; font-size: 29px; }
.experience-tags { margin-top: 46px; color: var(--bronze-light); }

.window-label {
  position: absolute;
  z-index: 4;
  top: 298px;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--paper);
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.72);
}

.window-label--past { left: 810px; }
.window-label--now { left: 1018px; }

.window-label b {
  font-family: var(--font-display-zh);
  font-size: 30px;
}

.window-label span {
  margin-top: 8px;
  font-size: 17px;
}

.window-bridge {
  position: absolute;
  z-index: 4;
  left: 850px;
  top: 454px;
  width: 250px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--bronze-light), transparent);
  transform-origin: left center;
}

/* === 09 YOUTHFUL SCHOOL === */
.youth-image {
  position: absolute;
  inset: 0 0 auto;
  height: 760px;
  overflow: hidden;
}

.youth-image::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(27, 24, 21, 0.9) 0%, rgba(27, 24, 21, 0.2) 55%, rgba(27, 24, 21, 0.05)), linear-gradient(0deg, var(--dark-brown), transparent 32%);
}

.youth-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.74) brightness(0.8);
}

.youth-copy {
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding-top: 104px;
}

.youth-copy .slide-title { margin-top: 26px; }
.youth-copy .lead-copy { width: 590px; font-size: 29px; }

.youth-years {
  position: absolute;
  left: 120px;
  right: 120px;
  bottom: 72px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  color: var(--paper);
}

.youth-years::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 13px;
  height: 1px;
  background: linear-gradient(90deg, var(--history-red), var(--bronze));
}

.youth-years article {
  position: relative;
  padding-top: 44px;
}

.youth-years article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--bronze);
}

.youth-years b {
  display: block;
  font-family: var(--font-display-en), var(--font-display-zh);
  font-size: 46px;
  font-weight: 500;
}

.youth-years span { color: rgba(244, 239, 230, 0.62); font-size: 19px; }

/* === 10 PILLAR INNOVATION === */
.pillar-grid {
  display: grid;
  grid-template-columns: 610px 360px 1fr;
  grid-template-rows: 1fr 74px;
  gap: 28px;
}

.pillar-copy {
  min-width: 0;
  padding-top: 10px;
}

.pillar-copy .slide-title {
  margin-top: 24px;
  font-size: 70px;
}

.pillar-thesis {
  margin: 28px 0 0;
  color: var(--history-red);
  font-family: var(--font-display-zh);
  font-size: 28px;
  line-height: 1.55;
}

.pillar-logic {
  display: grid;
  grid-template-columns: repeat(7, auto);
  align-items: center;
  gap: 10px;
  margin-top: 44px;
}

.pillar-logic article {
  width: 108px;
  text-align: center;
}

.pillar-logic em {
  color: var(--bronze);
  font-size: 24px;
  font-style: normal;
  transform: rotate(-90deg);
}

.pillar-logic span {
  display: block;
  margin-top: 12px;
  font-size: 18px;
  white-space: nowrap;
}

.pillar-icon {
  position: relative;
  display: block;
  width: 35px;
  height: 100px;
  margin: 0 auto;
  border: 2px solid var(--charcoal);
  background: rgba(52, 52, 52, 0.05);
}

.pillar-icon--wrapped {
  box-shadow: 0 0 0 8px rgba(176, 138, 82, 0.2), 0 0 0 10px var(--bronze);
}

.pillar-icon--info::before,
.pillar-icon--media::before,
.pillar-icon--media::after {
  content: "";
  position: absolute;
  left: -22px;
  right: -22px;
  border: 2px solid var(--bronze);
  background: rgba(176, 138, 82, 0.08);
}

.pillar-icon--info::before { top: 18px; height: 62px; }
.pillar-icon--media::before { top: 12px; height: 45px; }
.pillar-icon--media::after { left: -36px; right: -36px; bottom: -10px; height: 24px; }

.pillar-axo,
.pillar-result {
  position: relative;
  align-self: stretch;
  min-width: 0;
  overflow: hidden;
  background: var(--paper-highlight);
}

.pillar-axo img,
.pillar-result img {
  width: 100%;
  height: calc(100% - 48px);
}

.pillar-axo img { object-fit: contain; mix-blend-mode: multiply; }
.pillar-result img { object-fit: cover; object-position: 65% center; }

.pillar-axo figcaption,
.pillar-result figcaption {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 14px;
  color: rgba(34, 34, 34, 0.56);
  font-size: 17px;
}

.axo-mark {
  position: absolute;
  width: 14px;
  height: 14px;
  border: 3px solid var(--paper);
  border-radius: 50%;
  background: var(--bronze);
  box-shadow: 0 0 0 1px var(--bronze);
}

.axo-mark--1 { left: 38%; top: 43%; }
.axo-mark--2 { left: 51%; top: 38%; }
.axo-mark--3 { left: 61%; top: 47%; }
.axo-mark--4 { left: 47%; top: 53%; }

.pillar-values {
  grid-column: 1 / 4;
  align-items: end;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--archive-gray);
}

.pillar-values span {
  width: 31%;
  padding: 0;
  border: 0;
  color: var(--history-red);
  font-family: var(--font-display-zh);
  font-size: 24px;
  text-align: center;
}

/* === 11 GROUP DEVELOPMENT === */
.slide-group .slide-title {
  position: absolute;
  left: 120px;
  top: 128px;
  width: 720px;
  font-size: 66px;
}

.slide-group .slide-eyebrow { position: absolute; left: 120px; top: 88px; }

.group-thesis {
  position: absolute;
  left: 120px;
  top: 336px;
  width: 650px;
  margin: 0;
  font-size: 28px;
  line-height: 1.62;
}

.group-map {
  position: absolute;
  left: 100px;
  bottom: 74px;
  width: 940px;
  height: 540px;
  padding: 18px 18px 48px;
  background: var(--paper-highlight);
}

.group-map img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.group-space {
  position: absolute;
  right: 120px;
  top: 88px;
  width: 710px;
  height: 790px;
  overflow: hidden;
}

.group-space img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.group-map figcaption,
.group-space figcaption {
  position: absolute;
  left: 18px;
  bottom: 14px;
  color: rgba(34, 34, 34, 0.54);
  font-size: 17px;
}

.group-space figcaption {
  right: 18px;
  padding: 13px 16px;
  background: rgba(244, 239, 230, 0.88);
}

.group-strength {
  position: absolute;
  left: 1100px;
  right: 120px;
  bottom: 78px;
  z-index: 4;
  justify-content: space-between;
  color: var(--paper);
}

.group-strength span {
  border-color: var(--bronze-light);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
}

/* === 12 FIVE EDUCATIONS === */
.slide-five .slide-title { margin-top: 28px; }
.slide-five .lead-copy { position: absolute; right: 120px; top: 122px; width: 680px; margin: 0; font-size: 29px; }

.five-arches {
  position: absolute;
  left: 120px;
  right: 120px;
  top: 320px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  height: 420px;
}

.five-arches article {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--bronze);
  border-radius: 180px 180px 0 0;
  background: linear-gradient(180deg, rgba(176, 138, 82, 0.08), transparent 74%);
}

.five-arches article.is-primary {
  border-color: var(--history-red);
  background: linear-gradient(180deg, rgba(122, 48, 40, 0.14), transparent 74%);
}

.five-arches b {
  font-family: var(--font-display-zh);
  font-size: 82px;
  font-weight: 600;
}

.five-arches span {
  margin-top: 24px;
  color: rgba(34, 34, 34, 0.62);
  font-size: 24px;
}

.five-reference {
  position: absolute;
  right: 120px;
  bottom: 58px;
  width: 460px;
  height: 180px;
  overflow: hidden;
  opacity: 0.56;
}

.five-reference img { width: 100%; height: 130px; object-fit: cover; object-position: center 44%; }
.five-reference figcaption { color: rgba(34, 34, 34, 0.5); font-size: 16px; }

/* === 13 DIGITAL EXPERIENCE === */
.slide-digital .slide-title { margin-top: 28px; font-size: 68px; }
.slide-digital .lead-copy { position: absolute; right: 120px; top: 128px; width: 580px; margin: 0; font-size: 28px; }

.digital-gallery {
  position: absolute;
  left: 120px;
  right: 120px;
  top: 340px;
  bottom: 80px;
  display: grid;
  grid-template-columns: 1.55fr 0.9fr;
  grid-template-rows: 1fr 1fr;
  gap: 22px;
}

.digital-gallery figure {
  position: relative;
  overflow: hidden;
  background: var(--charcoal);
}

.digital-main { grid-row: 1 / 3; }

.digital-gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.75) brightness(0.84);
}

.digital-gallery figcaption {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 16px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 14px 16px;
  background: rgba(34, 34, 34, 0.78);
  color: var(--paper);
  backdrop-filter: blur(10px);
}

.digital-gallery figcaption b { color: var(--bronze-light); font-size: 20px; }
.digital-gallery figcaption span { font-size: 17px; }

/* === 14 MATERIALS === */
.slide-materials .slide-title { margin-top: 28px; font-size: 68px; }
.slide-materials .lead-copy { position: absolute; right: 120px; top: 130px; width: 720px; margin: 0; font-size: 27px; }

.material-strips {
  position: absolute;
  left: 120px;
  right: 120px;
  top: 360px;
  bottom: 100px;
  display: grid;
  grid-template-columns: 1.25fr 1fr 0.72fr 1.08fr;
  gap: 28px;
}

.material-strips figure {
  position: relative;
  overflow: hidden;
}

.material-strips img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(0.95);
}

.material-strips figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 20px 18px;
  background: linear-gradient(0deg, rgba(34, 34, 34, 0.84), transparent);
  color: var(--paper);
}

.material-strips figcaption b,
.material-strips figcaption span { display: block; }
.material-strips figcaption b { font-size: 23px; }
.material-strips figcaption span { margin-top: 5px; color: rgba(244, 239, 230, 0.64); font-size: 16px; }

/* === 15 SUMMARY === */
.slide-summary .slide-title { margin-top: 28px; }

.summary-columns {
  position: absolute;
  left: 120px;
  right: 120px;
  top: 300px;
  bottom: 90px;
  display: grid;
  grid-template-columns: 1fr 1.14fr 1fr;
  gap: 32px;
  align-items: end;
}

.summary-columns article {
  position: relative;
  padding-top: 24px;
  border-top: 1px solid var(--archive-gray);
}

.summary-columns figure {
  height: 390px;
  margin-bottom: 28px;
  overflow: hidden;
}

.summary-columns .is-core figure { height: 460px; }

.summary-columns img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72);
}

.summary-columns b { color: var(--bronze); font-family: var(--font-display-en); font-size: 23px; }
.summary-columns h3 { margin: 8px 0 0; font-family: var(--font-display-zh); font-size: 35px; }
.summary-columns p { margin: 9px 0 0; color: rgba(34, 34, 34, 0.54); font-size: 20px; }

/* === 16 SPATIAL GALLERY === */
.gallery-title {
  position: absolute;
  left: 120px;
  top: 88px;
  z-index: 5;
}

.gallery-title .slide-title { margin-top: 24px; font-size: 64px; }

.gallery-grid {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1.75fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 8px;
}

.gallery-grid figure { position: relative; overflow: hidden; }
.gallery-main { grid-row: 1 / 3; }
.gallery-grid img { width: 100%; height: 100%; object-fit: cover; filter: saturate(0.77) brightness(0.72); }
.gallery-grid figcaption { position: absolute; left: 26px; bottom: 24px; color: var(--paper); font-family: var(--font-display-zh); font-size: 28px; text-shadow: 0 3px 18px rgba(0,0,0,0.8); }

/* === 17 MASTER VIEW === */
.master-copy {
  position: absolute;
  left: 120px;
  top: 120px;
  width: 520px;
}

.master-copy .slide-title { margin-top: 28px; font-size: 68px; }

.master-list {
  margin: 54px 0 0;
  padding: 0;
  list-style: none;
  columns: 2;
  column-gap: 30px;
  counter-reset: master;
}

.master-list li {
  margin-bottom: 24px;
  color: rgba(34, 34, 34, 0.68);
  font-size: 21px;
  counter-increment: master;
}

.master-list li::before {
  content: "0" counter(master);
  display: inline-block;
  width: 34px;
  color: var(--bronze);
  font-family: var(--font-display-en);
}

.master-view {
  position: absolute;
  right: 80px;
  top: 80px;
  width: 1160px;
  height: 880px;
}

.master-view > img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.master-view figcaption {
  position: absolute;
  right: 40px;
  bottom: 12px;
  color: rgba(34,34,34,0.5);
}

.route-line {
  position: absolute;
  left: 265px;
  top: 520px;
  width: 650px;
  height: 130px;
  border-top: 4px solid var(--bronze);
  border-radius: 50%;
  transform: rotate(-11deg);
}

.route-line i {
  position: absolute;
  top: -9px;
  width: 16px;
  height: 16px;
  border: 3px solid var(--paper);
  border-radius: 50%;
  background: var(--bronze);
  box-shadow: 0 0 0 1px var(--bronze);
}

.route-line i:nth-child(1) { left: 0; background: var(--history-red); }
.route-line i:nth-child(2) { left: 18%; }
.route-line i:nth-child(3) { left: 37%; }
.route-line i:nth-child(4) { left: 57%; }
.route-line i:nth-child(5) { left: 77%; }
.route-line i:nth-child(6) { right: 0; }

/* === 18 VISITOR JOURNEY === */
.slide-journey .slide-title { margin-top: 26px; font-size: 62px; }
.slide-journey .lead-copy { position: absolute; right: 120px; top: 132px; width: 500px; margin: 0; font-size: 27px; }

.journey-line {
  position: absolute;
  left: 150px;
  right: 80px;
  top: 648px;
  height: 2px;
  background: linear-gradient(90deg, var(--history-red), var(--bronze), transparent);
  transform: rotate(-4deg);
  transform-origin: left center;
}

.journey-steps {
  position: absolute;
  left: 120px;
  right: 120px;
  top: 330px;
  bottom: 96px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 26px;
  align-items: center;
}

.journey-steps article {
  position: relative;
  align-self: center;
}

.journey-steps article:nth-child(2) { transform: translateY(-30px); }
.journey-steps article:nth-child(3) { transform: translateY(-62px); }
.journey-steps article:nth-child(4) { transform: translateY(-90px); }
.journey-steps article:nth-child(5) { transform: translateY(-116px); }

.journey-steps img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  filter: saturate(0.65);
}

.journey-steps .is-major img { height: 285px; }
.journey-steps b { position: absolute; top: 10px; left: 12px; z-index: 2; color: var(--paper); font-family: var(--font-display-en); font-size: 26px; text-shadow: 0 2px 12px rgba(0,0,0,0.7); }
.journey-steps h3 { margin: 16px 0 0; font-family: var(--font-display-zh); font-size: 30px; }
.journey-steps p { margin: 7px 0 0; color: rgba(34,34,34,0.52); font-size: 18px; }

/* Phase 2 asset integration: evidence -> overview -> experience */
.strategy-board { position: relative; min-width: 0; height: 100%; }
.strategy-plan { width: 100%; height: 100%; margin: 0; }
.strategy-plan figcaption { position: absolute; right: 32px; bottom: 24px; padding: 12px 18px; background: rgba(244,239,230,0.92); font-size: 17px; letter-spacing: 0.08em; }
.strategy-origin { position: absolute; left: 28px; bottom: 28px; width: 360px; margin: 0; padding: 10px; background: rgba(244,239,230,0.97); box-shadow: 0 18px 48px rgba(34,34,34,0.16); }
.strategy-origin img { display: block; width: 100%; height: 184px; object-fit: cover; object-position: left center; }
.strategy-origin figcaption { display: flex; justify-content: space-between; gap: 16px; padding: 12px 4px 4px; font-size: 15px; line-height: 1.45; }
.strategy-origin b { flex: 0 0 auto; color: var(--history-red); }
.strategy-origin span { color: rgba(34,34,34,0.58); }

.gallery-grid { grid-template-rows: repeat(3, 1fr); }
.gallery-main { grid-row: 1 / 4; }

.master-copy { width: 420px; }
.master-lead { margin: 48px 0 0; width: 360px; color: rgba(34,34,34,0.68); font-size: 23px; line-height: 1.8; }
.master-guide { position: absolute; left: 505px; top: 185px; width: 300px; height: 700px; margin: 0; }
.master-guide img { width: 100%; height: 100%; object-fit: contain; mix-blend-mode: multiply; }
.master-guide figcaption,
.master-view figcaption { position: absolute; left: 0; bottom: -28px; color: var(--bronze); font-size: 17px; letter-spacing: 0.08em; }
.master-view { right: 80px; top: 105px; width: 940px; height: 500px; }
.route-line { left: 210px; top: 285px; width: 530px; height: 105px; }
.master-nodes { position: absolute; right: 80px; bottom: 80px; width: 940px; height: 300px; overflow: hidden; border-top: 1px solid var(--bronze); background: var(--paper-highlight); color: inherit; text-decoration: none; }
.master-nodes img { width: 100%; height: 100%; object-fit: cover; object-position: center top; mix-blend-mode: multiply; }
.master-nodes::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, transparent 58%, rgba(244,239,230,0.95)); }
.master-nodes span { position: absolute; z-index: 2; right: 26px; bottom: 24px; display: grid; gap: 7px; color: rgba(34,34,34,0.52); font-size: 15px; text-align: right; }
.master-nodes b { color: var(--history-red); font-family: var(--font-display-zh); font-size: 22px; }

/* === INSERTED EVIDENCE SLIDES === */
.evidence-copy { position: absolute; left: 120px; top: 118px; width: 500px; }
.evidence-copy .slide-title { margin-top: 30px; font-size: 64px; line-height: 1.12; }
.evidence-copy .lead-copy { margin-top: 36px; width: 430px; font-size: 24px; }
.evidence-points { display: grid; gap: 0; margin-top: 45px; border-top: 1px solid var(--archive-gray); }
.evidence-points span { display: flex; gap: 22px; padding: 20px 0; border-bottom: 1px solid var(--archive-gray); font-size: 20px; }
.evidence-points b { color: var(--bronze); font-family: var(--font-display-en); }
.evidence-board { position: absolute; right: 90px; top: 90px; width: 1130px; height: 860px; margin: 0; background: var(--paper-highlight); }
.evidence-board img { width: 100%; height: 100%; object-fit: contain; mix-blend-mode: multiply; }
.evidence-board figcaption { position: absolute; right: 28px; bottom: 22px; padding: 12px 18px; background: rgba(244,239,230,0.92); color: var(--bronze); font-size: 17px; letter-spacing: 0.08em; }

.option-copy { position: absolute; left: 120px; top: 135px; width: 500px; }
.option-copy .slide-title { margin-top: 32px; font-size: 68px; }
.option-copy .lead-copy { margin-top: 42px; width: 430px; font-size: 24px; }
.option-copy .keyword-row { margin-top: 48px; }
.option-visual { position: absolute; right: 80px; top: 95px; width: 1180px; height: 850px; margin: 0; background: var(--paper-highlight); }
.option-visual img { width: 100%; height: 100%; object-fit: cover; object-position: center; filter: saturate(0.75); }
.option-visual figcaption { position: absolute; left: 24px; bottom: 22px; padding: 11px 16px; background: rgba(244,239,230,0.9); color: rgba(34,34,34,0.62); font-size: 17px; }

.wall-heading { position: absolute; left: 120px; top: 88px; width: 600px; z-index: 2; }
.wall-heading .slide-title { margin-top: 25px; font-size: 60px; line-height: 1.12; }
.wall-heading .lead-copy { position: absolute; left: 670px; top: 42px; width: 650px; margin: 0; font-size: 24px; }
.wall-board { position: absolute; left: 120px; right: 120px; top: 330px; bottom: 90px; margin: 0; background: var(--paper-highlight); overflow: hidden; }
.wall-board img { width: 100%; height: 100%; object-fit: cover; object-position: center; mix-blend-mode: multiply; }
.wall-board figcaption { position: absolute; left: 42px; right: 42px; bottom: 24px; display: flex; align-items: center; gap: 18px; padding: 13px 20px; background: rgba(244,239,230,0.9); color: var(--history-red); font-family: var(--font-display-zh); font-size: 21px; }
.wall-board figcaption i { flex: 1; height: 1px; background: var(--bronze); }

.slide-master .master-copy { width: 450px; }
.slide-master .master-view { right: 70px; top: 90px; width: 1200px; height: 870px; }
.slide-master .route-line { left: 275px; top: 505px; width: 670px; height: 135px; }

.guide-copy { position: absolute; left: 120px; top: 130px; width: 510px; }
.guide-copy .slide-title { margin-top: 30px; font-size: 68px; }
.guide-copy .lead-copy { margin-top: 40px; width: 410px; font-size: 24px; }
.guide-zones { display: grid; gap: 14px; margin-top: 48px; width: 330px; }
.guide-zones span { padding: 14px 18px; border-left: 3px solid var(--bronze); background: rgba(176,138,82,0.07); font-size: 20px; }
.guide-board { position: absolute; left: 690px; top: 70px; width: 760px; height: 900px; margin: 0; }
.guide-board img { width: 100%; height: 100%; object-fit: contain; mix-blend-mode: multiply; }
.guide-board figcaption { position: absolute; left: 790px; top: 220px; width: 300px; color: rgba(34,34,34,0.54); font-size: 18px; line-height: 1.8; }

.nodes-heading { position: absolute; left: 120px; right: 120px; top: 72px; display: grid; grid-template-columns: 1fr 1fr; align-items: end; }
.nodes-heading .slide-eyebrow { grid-column: 1 / 3; }
.nodes-heading .slide-title { margin-top: 20px; font-size: 54px; white-space: nowrap; }
.nodes-heading .lead-copy { justify-self: end; width: 520px; margin: 0 0 5px; font-size: 22px; }
.nodes-board { position: absolute; left: 95px; right: 95px; top: 260px; bottom: 110px; margin: 0; overflow: hidden; background: var(--paper-highlight); }
.nodes-board img { width: 100%; height: 100%; object-fit: contain; mix-blend-mode: multiply; }
.nodes-legend { position: absolute; right: 120px; bottom: 62px; display: flex; gap: 28px; color: var(--bronze); font-size: 17px; }

/* === 19 FUTURE === */
.future-image {
  position: absolute;
  right: 0;
  top: 0;
  width: 66%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.52) brightness(1.05);
}

.future-fade {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--paper) 0%, var(--paper) 34%, rgba(244,239,230,0.84) 49%, transparent 76%);
}

.future-copy {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 780px;
}

.future-copy .slide-title { margin-top: 28px; }
.future-copy .lead-copy { width: 640px; font-size: 28px; }

.future-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px 30px;
  width: 600px;
  margin-top: 46px;
  color: var(--history-red);
  font-family: var(--font-display-zh);
  font-size: 23px;
}

.future-axis {
  position: absolute;
  left: 120px;
  width: 980px;
  bottom: 82px;
  height: 2px;
  background: linear-gradient(90deg, var(--bronze), transparent);
  transform-origin: left center;
}

/* === 20 CLOSING === */
.closing-ghost {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 970px;
  height: 620px;
  object-fit: cover;
  filter: grayscale(1) sepia(0.15);
  opacity: 0.095;
}

.closing-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  z-index: 2;
}

.closing-copy .slide-title { margin-top: 30px; }
.closing-copy .museum-rule { margin-top: 42px; }
.closing-copy .lead-copy { width: 600px; font-size: 31px; }
.closing-name { position: absolute; left: 120px; bottom: 92px; margin: 0; color: rgba(34,34,34,0.5); font-size: 20px; letter-spacing: 0.08em; }

/* === CALM / EDITORIAL REVEALS === */
.reveal,
.reveal-left,
.reveal-scale,
.reveal-line {
  opacity: 0;
  will-change: opacity, transform;
  transition-timing-function: var(--ease-museum);
}

.reveal {
  transform: translateY(28px);
  transition-property: opacity, transform;
  transition-duration: var(--duration-base);
}

.reveal-left {
  transform: translateX(-40px);
  transition-property: opacity, transform;
  transition-duration: var(--duration-base);
}

.reveal-scale {
  transform: scale(0.975);
  transition-property: opacity, transform;
  transition-duration: var(--duration-slow);
}

.reveal-line {
  transform: scaleX(0);
  transform-origin: left center;
  transition-property: opacity, transform;
  transition-duration: var(--duration-slow);
}

.slide.visible .reveal,
.slide.visible .reveal-left,
.slide.visible .reveal-scale,
.slide.visible .reveal-line {
  opacity: 1;
  transform: none;
}

.slide.visible .reveal:nth-child(1) { transition-delay: 80ms; }
.slide.visible .reveal:nth-child(2) { transition-delay: 160ms; }
.slide.visible .reveal:nth-child(3) { transition-delay: 240ms; }
.slide.visible .reveal:nth-child(4) { transition-delay: 320ms; }

/* === PRESENTATION CHROME === */
.deck-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px;
  border: 1px solid rgba(244, 239, 230, 0.18);
  border-radius: 999px;
  background: rgba(34, 34, 34, 0.76);
  box-shadow: 0 10px 34px rgba(0, 0, 0, 0.18);
  color: var(--paper);
  opacity: 0.2;
  backdrop-filter: blur(18px);
  transition: opacity var(--duration-fast) ease;
}

.deck-controls:hover,
.deck-controls:focus-within {
  opacity: 1;
}

.control-button,
.page-indicator {
  min-width: 42px;
  height: 36px;
  padding: 0 12px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font-family: var(--font-label-en), var(--font-body-zh);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.control-button:hover,
.control-button:focus-visible,
.page-indicator:hover,
.page-indicator:focus-visible {
  outline: none;
  background: rgba(244, 239, 230, 0.12);
}

.control-button:disabled {
  cursor: default;
  opacity: 0.32;
}

.control-button--wide {
  min-width: 58px;
}

.deck-progress {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  z-index: 1001;
  background: rgba(244, 239, 230, 0.08);
}

.deck-progress span {
  display: block;
  width: 5%;
  height: 100%;
  background: var(--bronze);
  transform-origin: left center;
  transition: width var(--duration-base) var(--ease-museum);
}

.chapter-nav {
  position: fixed;
  top: 50%;
  right: 18px;
  z-index: 1002;
  display: flex;
  flex-direction: column;
  gap: 9px;
  transform: translateY(-50%);
}

.chapter-nav__item {
  position: relative;
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.chapter-nav__item::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(244, 239, 230, 0.38);
  transition: width var(--duration-fast) ease,
              height var(--duration-fast) ease,
              background var(--duration-fast) ease;
}

.chapter-nav__item:hover::before,
.chapter-nav__item:focus-visible::before {
  width: 9px;
  height: 9px;
  background: var(--bronze-light);
}

.chapter-nav__item.is-active::before {
  width: 11px;
  height: 11px;
  background: var(--bronze);
}

.chapter-nav__label {
  position: absolute;
  right: 28px;
  top: 50%;
  width: max-content;
  padding: 6px 9px;
  border-radius: 2px;
  background: rgba(34, 34, 34, 0.9);
  color: var(--paper);
  font-size: 12px;
  opacity: 0;
  pointer-events: none;
  transform: translate(8px, -50%);
  transition: opacity 180ms ease, transform 180ms ease;
}

.chapter-nav__item:hover .chapter-nav__label,
.chapter-nav__item:focus-visible .chapter-nav__label {
  opacity: 1;
  transform: translate(0, -50%);
}

/* === PHASE 2.5 / NEW SLIDES VISUAL RECONSTRUCTION === */
.slide-evidence .evidence-heading { position: absolute; left: 120px; top: 82px; width: 720px; z-index: 4; }
.slide-evidence .evidence-heading .slide-title { margin-top: 22px; font-size: 58px; line-height: 1.08; }
.slide-evidence .evidence-plan { position: absolute; left: 650px; top: 82px; width: 1140px; height: 680px; overflow: hidden; background: var(--ink); }
.slide-evidence .evidence-plan > img { width: 100%; height: 100%; object-fit: cover; opacity: 0.72; }
.evidence-route { position: absolute; left: 245px; top: 375px; width: 690px; height: 120px; border-top: 4px solid var(--bronze-light); border-radius: 50%; transform: rotate(-4deg); }
.evidence-route i { position: absolute; top: -11px; width: 17px; height: 17px; border: 3px solid var(--ink); border-radius: 50%; background: var(--bronze-light); box-shadow: 0 0 0 1px var(--bronze-light); }
.evidence-route i:nth-child(1) { left: 0; background: var(--history-red); }
.evidence-route i:nth-child(2) { left: 32%; }.evidence-route i:nth-child(3) { left: 64%; }.evidence-route i:nth-child(4) { right: 0; }
.evidence-route span { position: absolute; left: -25px; top: 22px; color: var(--paper); font-size: 14px; letter-spacing: 0.16em; }
.plan-size { position: absolute; right: 26px; top: 24px; color: rgba(244,239,230,0.55); font-family: var(--font-display-en); font-size: 17px; font-weight: 400; }
.evidence-photo { position: absolute; z-index: 3; margin: 0; overflow: hidden; border: 8px solid var(--paper); box-shadow: 0 18px 42px rgba(34,34,34,0.16); }
.evidence-photo img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(1) contrast(0.88); }
.evidence-photo figcaption { position: absolute; left: 14px; bottom: 12px; color: var(--paper); font-size: 15px; text-shadow: 0 2px 10px rgba(0,0,0,0.8); }
.evidence-photo--wide { left: 120px; top: 420px; width: 465px; height: 260px; }
.evidence-photo--entry { left: 455px; top: 650px; width: 390px; height: 230px; }
.evidence-strategies { position: absolute; left: 880px; right: 120px; bottom: 86px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 42px; }
.evidence-strategies article { padding-top: 18px; border-top: 1px solid var(--bronze); }
.evidence-strategies b { color: var(--bronze); font-family: var(--font-display-en); font-size: 17px; }
.evidence-strategies h3 { margin: 12px 0 5px; font-family: var(--font-display-zh); font-size: 27px; }
.evidence-strategies p { margin: 0; color: rgba(34,34,34,0.52); font-size: 18px; }

.slide-entrance-option .option-heading { position: absolute; left: 120px; right: 120px; top: 72px; z-index: 4; display: grid; grid-template-columns: 1fr 540px; align-items: end; }
.option-heading .slide-eyebrow { grid-column: 1 / 3; }
.option-heading .slide-title { margin-top: 18px; font-size: 58px; white-space: nowrap; }
.option-heading .lead-copy { justify-self: end; width: 510px; margin: 0 0 5px; font-size: 23px; }
.slide-entrance-option .option-visual { left: 120px; right: 120px; top: 250px; width: auto; height: 700px; overflow: hidden; }
.slide-entrance-option .option-visual > img { width: 100%; height: 100%; object-fit: cover; object-position: center 47%; filter: saturate(0.72) contrast(0.96); }
.option-mark { position: absolute; color: var(--paper); font-size: 16px; text-shadow: 0 2px 10px rgba(0,0,0,0.8); }
.option-mark i { display: block; width: 13px; height: 13px; margin-bottom: 8px; border: 3px solid var(--paper); border-radius: 50%; background: var(--history-red); box-shadow: 0 0 0 1px var(--history-red); }
.option-mark::after { content: ""; position: absolute; left: 6px; bottom: 100%; width: 1px; height: 70px; background: rgba(244,239,230,0.65); }
.option-mark--logo { left: 30%; top: 34%; }.option-mark--name { left: 57%; top: 27%; }.option-mark--relief { left: 74%; top: 67%; }
.slide-five-wall .wall-heading { left: 120px; right: 120px; top: 70px; width: auto; display: grid; grid-template-columns: 1fr 600px; align-items: end; }
.slide-five-wall .wall-heading .slide-eyebrow { grid-column: 1 / 3; }
.slide-five-wall .wall-heading .slide-title { margin-top: 18px; font-size: 56px; white-space: nowrap; }
.slide-five-wall .wall-heading .lead-copy { position: static; justify-self: end; width: 520px; margin: 0 0 4px; font-size: 23px; }
.slide-five-wall .wall-board { left: 90px; right: 90px; top: 285px; bottom: 105px; background: transparent; overflow: visible; }
.slide-five-wall .wall-board > img { width: 100%; height: 585px; object-fit: cover; object-position: center; mix-blend-mode: normal; filter: saturate(0.82); box-shadow: 0 18px 50px rgba(34,34,34,0.12); }
.wall-axis { position: absolute; left: 250px; right: 40px; bottom: 26px; display: grid; grid-template-columns: repeat(5,1fr); }
.wall-axis span { display: grid; gap: 5px; padding-top: 14px; border-top: 1px solid var(--bronze); color: var(--ink); font-size: 17px; }
.wall-axis b { color: var(--bronze); font-family: var(--font-display-en); font-size: 14px; }
.wall-measure { position: absolute; left: 220px; right: 30px; top: -28px; display: flex; align-items: center; gap: 18px; color: var(--bronze); font-family: var(--font-display-en); font-size: 15px; letter-spacing: 0.12em; }
.wall-measure i { flex: 1; height: 1px; background: var(--bronze); }

.slide-guide .guide-heading { position: absolute; left: 120px; top: 85px; z-index: 4; width: 650px; }
.slide-guide .guide-heading .slide-title { margin-top: 22px; font-size: 62px; line-height: 1.08; }
.guide-plan { position: absolute; left: 610px; top: 245px; width: 760px; height: 610px; margin: 0; overflow: hidden; }
.guide-plan > img { position: absolute; left: -10px; top: -155px; width: 780px; height: auto; mix-blend-mode: multiply; }
.guide-plan::after { content: ""; position: absolute; z-index: 1; left: 0; right: 0; top: 435px; bottom: 0; background: var(--paper); }
.guide-route { position: absolute; z-index: 2; left: 245px; top: 300px; width: 385px; height: 295px; border: 4px dashed rgba(176,138,82,0.82); border-left-color: transparent; border-radius: 45%; transform: rotate(-8deg); }
.guide-route i { position: absolute; width: 17px; height: 17px; border: 3px solid var(--paper); border-radius: 50%; background: var(--bronze); box-shadow: 0 0 0 1px var(--bronze); }
.guide-route i:nth-child(1){right:25px;bottom:-8px;background:var(--history-red)}.guide-route i:nth-child(2){right:-9px;top:40%}.guide-route i:nth-child(3){right:20%;top:-9px}.guide-route i:nth-child(4){left:45%;top:-9px}.guide-route i:nth-child(5){left:-9px;top:32%}.guide-route i:nth-child(6){left:15%;bottom:-9px}.guide-route i:nth-child(7){left:55%;bottom:-9px}
.guide-entry { position: absolute; z-index: 2; right: 84px; top: 525px; color: var(--history-red); font-family: var(--font-display-en); font-size: 14px; letter-spacing: 0.16em; }
.guide-sequence { position: absolute; right: 110px; top: 165px; width: 420px; display: grid; gap: 0; }
.guide-sequence span { display: flex; align-items: baseline; gap: 16px; padding: 18px 0; font-family: var(--font-display-zh); font-size: 24px; }
.guide-sequence b { width: 58px; color: var(--bronze); font-family: var(--font-display-en); font-size: 16px; }
.guide-sequence i { height: 1px; background: var(--archive-gray); }
.slide-guide .guide-zones { position: absolute; left: 120px; bottom: 105px; display: flex; width: auto; gap: 12px; }
.slide-guide .guide-zones span { padding: 12px 17px; border: 1px solid var(--bronze); border-left-width: 1px; background: transparent; color: var(--bronze); font-size: 16px; }

.slide-nodes .nodes-heading { left: 120px; right: 120px; top: 76px; display: grid; grid-template-columns: 1fr 540px; align-items: end; }
.slide-nodes .nodes-heading .slide-eyebrow { grid-column: 1 / 3; }
.slide-nodes .nodes-heading .slide-title { margin-top: 18px; font-size: 56px; line-height: 1.08; white-space: normal; }
.slide-nodes .nodes-heading .lead-copy { justify-self: end; width: 510px; margin: 0 0 6px; font-size: 22px; }
.nodes-route { position: absolute; left: 170px; right: 170px; top: 650px; height: 3px; background: linear-gradient(90deg,var(--history-red),var(--bronze),rgba(176,138,82,0.25)); }
.nodes-grid { position: absolute; left: 120px; right: 120px; top: 395px; display: grid; grid-template-columns: repeat(11,1fr); gap: 10px; }
.nodes-grid article { position: relative; display: grid; justify-items: center; align-content: start; min-width: 0; text-align: center; }
.nodes-grid article:nth-child(even) { transform: translateY(105px); }
.slide-nodes.visible .nodes-grid .reveal { transition-delay: 0ms; }
.nodes-grid img { width: 62px; height: 62px; object-fit: contain; mix-blend-mode: multiply; }
.nodes-grid b { margin-top: 20px; color: var(--bronze); font-family: var(--font-display-en); font-size: 16px; }
.nodes-grid span { margin-top: 7px; font-family: var(--font-display-zh); font-size: 18px; white-space: nowrap; }
.slide-nodes .nodes-legend { right: 120px; bottom: 88px; gap: 12px; }
.slide-nodes .nodes-legend span { padding: 11px 15px; border: 1px solid var(--bronze); font-size: 15px; }

/* === IMMERSIVE AUDIO CONTROL === */
.audio-control {
  position: fixed;
  right: 26px;
  bottom: 22px;
  z-index: 1002;
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 52px;
  padding: 7px 9px 7px 16px;
  border: 1px solid rgba(176,138,82,0.42);
  border-radius: 999px;
  background: rgba(244,239,230,0.9);
  box-shadow: 0 12px 36px rgba(34,34,34,0.13);
  color: var(--ink);
  opacity: 0.34;
  backdrop-filter: blur(18px);
  transition: opacity var(--duration-fast) ease, transform var(--duration-fast) ease;
}

.audio-control:hover,
.audio-control:focus-within { opacity: 1; transform: translateY(-2px); }
.audio-control__meta { display: grid; gap: 2px; width: 205px; padding-right: 12px; border-right: 1px solid rgba(176,138,82,0.28); }
.audio-control__chapter { overflow: hidden; color: var(--history-red); font-family: var(--font-display-zh); font-size: 13px; line-height: 1.2; text-overflow: ellipsis; white-space: nowrap; }
.audio-control__meta small { overflow: hidden; color: rgba(34,34,34,0.48); font-size: 10px; letter-spacing: 0.05em; text-overflow: ellipsis; white-space: nowrap; }
.audio-icon-button { display: grid; place-items: center; width: 36px; height: 36px; padding: 0; border: 1px solid transparent; border-radius: 50%; background: transparent; color: var(--bronze); cursor: pointer; }
.audio-icon-button:hover,
.audio-icon-button:focus-visible { outline: none; border-color: rgba(176,138,82,0.38); background: rgba(176,138,82,0.08); }
.audio-icon-button.is-active { background: var(--bronze); color: var(--paper); }
.audio-icon-button svg { width: 18px; height: 18px; overflow: visible; fill: currentColor; }
.audio-pause-shape { display: none; }
.audio-icon-button.is-active .audio-play-shape { display: none; }
.audio-icon-button.is-active .audio-pause-shape { display: block; }
.audio-icon-button .mute-slash { fill: none; stroke: var(--history-red); stroke-linecap: round; stroke-width: 1.8; }
.audio-icon-button[aria-pressed="false"] .mute-slash { opacity: 0; }
.audio-volume { display: flex; align-items: center; gap: 8px; padding: 0 7px; color: rgba(34,34,34,0.46); font-family: var(--font-label-en); font-size: 9px; letter-spacing: 0.12em; }
.audio-volume input { width: 72px; height: 2px; appearance: none; border: 0; border-radius: 999px; background: rgba(176,138,82,0.3); cursor: pointer; }
.audio-volume input::-webkit-slider-thumb { width: 10px; height: 10px; appearance: none; border: 2px solid var(--paper); border-radius: 50%; background: var(--bronze); box-shadow: 0 0 0 1px var(--bronze); }
.audio-volume input::-moz-range-thumb { width: 8px; height: 8px; border: 2px solid var(--paper); border-radius: 50%; background: var(--bronze); box-shadow: 0 0 0 1px var(--bronze); }

/* === ACCESSIBILITY === */
.skip-link {
  position: fixed;
  left: 16px;
  top: 16px;
  z-index: 10010;
  padding: 10px 14px;
  background: var(--paper);
  color: var(--ink);
  transform: translateY(-160%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

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

/* Chrome may adapt to small devices; the slide stage itself never reflows. */
@media (max-width: 720px) {
  .chapter-nav { right: 6px; gap: 4px; }
  .deck-controls { bottom: 10px; }
  .control-button--wide { display: none; }
  .audio-control { right: 8px; bottom: 64px; padding-left: 8px; }
  .audio-control__meta,
  .audio-volume { display: none; }
}

@media print {
  .chapter-nav,
  .deck-progress,
  .audio-control,
  .skip-link {
    display: none !important;
  }
}