@charset "UTF-8";
/* 长春记忆 · 3号建筑牌：浅蓝色探索手记。原深色样式保留在 style.css。 */
:root {
  color-scheme: light;
  --navy: #214b70; --blue: #477b9f; --muted: #5b7385;
  --line: #b9cfde; --paper: #f9fbfa; --sky: #e7f0f5;
  --rose: #b2526e; --mint: #357b67; --orange: #a35e34;
  --serif: "Songti SC", "STSong", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  --safe-nav: calc(66px + env(safe-area-inset-bottom, 0px));
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 20px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--sky); color: var(--navy); font: 16px/1.8 var(--sans); -webkit-tap-highlight-color: transparent; }
body.modal-open { overflow: hidden; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { font-family: var(--serif); font-weight: 400; }
h2 { font-size: 28px; line-height: 1.5; letter-spacing: .035em; }
h3 { font-size: 22px; line-height: 1.6; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; cursor: pointer; background: none; border: 0; }
button, a, summary, label { touch-action: manipulation; }
button:focus-visible, a:focus-visible, summary:focus-visible, input:focus-visible, [tabindex]:focus-visible { outline: 3px solid #527f9e; outline-offset: 4px; }
button:disabled { cursor: default; }
img { display: block; max-width: 100%; }
p { overflow-wrap: break-word; }
section[id], div[id] { scroll-margin-top: 22px; }
.wrap { width: calc(100% - 40px); max-width: 1120px; margin-inline: auto; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 60; padding: 10px 18px; background: white; transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.eyebrow { color: #5c7c94; font: 11px/1.8 var(--sans); letter-spacing: .1em; }
.site-header { display: flex; justify-content: space-between; align-items: center; gap: 15px; padding-block: calc(18px + env(safe-area-inset-top, 0px)) 16px; border-bottom: 1px solid #acc5d24f; }
.brand { display: flex; align-items: center; gap: 11px; font: 21px/1.3 var(--serif); letter-spacing: .09em; min-height: 44px; }
.brand small { font: 10px/1.6 var(--sans); display: block; color: var(--muted); letter-spacing: .02em; margin-top: 4px; }
.brand-seal { display: flex; flex-direction: column; justify-content: center; align-items: center; font: 18px/1.4 Georgia, serif; width: 34px; height: 43px; color: var(--blue); border: 1px solid #759bb68c; border-radius: 7px; background: #fff8; }
.desktop-nav { display: none; }
.motion-toggle { display: inline-flex; align-items: center; gap: 6px; font-size: 11px; white-space: nowrap; min-height: 44px; color: var(--muted); padding: 5px 9px; border: 1px solid #a9c2d35e; border-radius: 8px; }
.motion-toggle>span:first-child { font-size: 21px; }
.hero { position: relative; display: grid; gap: 5px; padding-top: 34px; }
.hero-copy { position: relative; z-index: 1; }
.tiny-star { color: #b2935d; margin-right: 6px; font-size: 16px; }
.hero h1 { font-size: 40px; line-height: 1.4; letter-spacing: .05em; margin-top: 16px; }
.hero h1>span { display: block; font-size: .8em; color: #587e9c; margin-top: 4px; }
.hero-description { font-size: 16px; color: var(--muted); line-height: 1.9; margin-top: 18px; }
.primary-button { display: inline-flex; align-items: center; justify-content: space-between; gap: 34px; min-height: 48px; padding: 9px 21px; margin-top: 24px; border-radius: 25px; background: #285b83; color: white; font-size: 15px; box-shadow: 0 4px 0 #b7cfdf; transition: transform .2s, background .2s; }
.primary-button:hover { background: #1e4c70; transform: translateY(-2px); }
.primary-button span { font-size: 23px; line-height: 1; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px; margin-top: 24px; }
.hero-actions .primary-button { margin-top: 0; gap: 20px; }
.hero-actions .text-button { min-height: 48px; gap: 8px; font-size: 15px; }
.hero-note { font-size: 11px; color: #6b8190; margin-top: 17px; }
.hero-art { position: relative; margin-inline: -10px; min-height: 230px; }
.hero-art img { width: 100%; height: auto; position: relative; z-index: 1; animation: float-note 7s ease-in-out infinite alternate; }
.hero-art figcaption { text-align: center; font-size: 10px; color: #6d8493; margin-top: -17px; position: relative; z-index: 2; }
.hero-sticker { position: absolute; top: 4%; right: 3%; padding: 5px 12px; font-size: 11px; background: #f7e8c7; border: 1px solid #d9c38e; border-radius: 7px; transform: rotate(8deg); z-index: 2; }
.hero-sticker i { font-style: normal; margin-left: 8px; font-size: 17px; }
.hero-fallback { display: none; }
.hero-art.failed img { visibility: hidden; }
.hero-art.failed .hero-fallback { display: grid; place-items: center; position: absolute; inset: 20% 15%; border: 1px dashed var(--line); border-radius: 20px; background: #f5f9fc; }
.chapter-shortcuts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 27px; }
.chapter-shortcuts a { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; min-height: 98px; padding: 11px 2px; border: 1px solid #c1d4df; border-radius: 13px; background: #f9fcffcf; box-shadow: 0 4px 0 #c9dbe43d; transition: transform .2s; }
.chapter-shortcuts a:hover { transform: translateY(-3px); }
.chapter-shortcuts a>span { font-size: 24px; line-height: 1.2; }
.chapter-shortcuts strong { font-weight: 500; font-size: 13px; white-space: nowrap; }
.chapter-shortcuts small { font-size: 9px; color: #6b7d8a; }
.spades { color: #42789e; } .hearts { color: var(--rose); } .clubs { color: var(--mint); } .diamonds { color: var(--orange); }
.chapter-shortcuts a.hearts { background: #fbf1f3; border-color: #e4cad3; }
.chapter-shortcuts a.clubs { background: #edf6ef; border-color: #bfd8ca; }
.chapter-shortcuts a.diamonds { background: #fcf3e7; border-color: #e4d3b7; }
.chapter { position: relative; padding-block: 53px; }
.anchor-alias { display: block; height: 0; position: relative; top: -12px; }
.chapter-heading { display: flex; align-items: center; gap: 12px; margin-bottom: 28px; position: relative; }
.chapter-symbol { display: grid; place-items: center; font: 28px/1 Georgia, serif; height: 50px; width: 44px; border: 1px solid currentColor; border-radius: 10px; background: #fff7; flex-shrink: 0; transform: rotate(-6deg); }
.chapter-heading h2 { font-size: 25px; margin-top: 5px; }
.chapter-number { display: none; }
.overview-intro, .detail-intro, .today-intro { display: grid; gap: 24px; }
.study-figure { min-width: 0; }
.card-crop { position: relative; width: 100%; aspect-ratio: 10/7; background: #d5e6ef; overflow: hidden; border-radius: 17px; border: 5px solid #fff; box-shadow: 0 5px 18px #2c536110; }
.card-crop img { position: absolute; width: 112.2%; max-width: none; height: auto; left: -6.1%; top: -53%; }
.study-figure figcaption { font-size: 10px; color: #657d8b; margin-top: 9px; }
.section-copy h3, .observation-notes h3 { font-size: 24px; margin-top: 12px; }
.section-copy>p, .observation-notes>p { font-size: 16px; color: var(--muted); line-height: 2; margin-top: 15px; }
.note-tag { display: inline-flex; align-items: center; min-height: 29px; background: #e0edf6; color: #3f6a88; border-radius: 6px; padding: 3px 10px; font-size: 11px; }
.note-tag.rose { color: #99516a; background: #f7e5eb; }
.note-tag.mint { color: #39745d; background: #e2f0e6; }
.note-tag.peach { color: #8c5e37; background: #f7e7cf; }
.source-link, .scene-source-inline, .detail-source { display: inline-flex; align-items: center; min-height: 44px; font-size: 11px; color: #466d86; border-bottom: 1px solid #a5c0d0; margin-top: 9px; }
.building-profiles { display: grid; gap: 13px; margin-top: 30px; }
.building-profiles article { display: flex; align-items: flex-start; gap: 15px; background: #fbfdff; border: 1px solid #c2d5e2; border-radius: 15px; padding: 22px 20px 14px; }
.building-index { display: grid; place-items: center; width: 39px; height: 39px; flex-shrink: 0; border-radius: 50%; font: 17px Georgia, serif; background: #e8f1f8; color: #587e99; }
.profile-label { font-size: 10px; color: #5d7c90; margin-bottom: 3px; }
.building-profiles h3 { font-size: 25px; }
.building-profiles p:not(.profile-label) { color: var(--muted); font-size: 15px; margin-top: 8px; }
.building-profiles a { display: inline-flex; align-items: center; justify-content: space-between; gap: 25px; min-height: 44px; margin-top: 6px; font-size: 12px; }
.building-profiles a span { font-size: 19px; }
.context-note { display: flex; gap: 15px; border: 1px dashed #a6becb; border-radius: 15px; padding: 23px 20px 18px; margin-top: 23px; background: #f3f7fa; }
.context-note>span { height: 26px; width: 26px; border: 1px solid #819db0; border-radius: 50%; font: 18px/1 Georgia, serif; display: grid; place-items: center; flex-shrink: 0; margin-top: 4px; }
.context-note h3 { font: 500 16px/1.8 var(--sans); }
.context-note p { font-size: 15px; color: #526d80; line-height: 2; margin-top: 8px; }
.details-background { background: #f9f5f5; border-block: 1px solid #e5dce0; }
.details-section .chapter-heading .eyebrow { color: #9b6175; }
.observation-notes details { border-top: 1px dashed #d8c0ca; margin-top: 17px; padding-top: 4px; }
summary { cursor: pointer; min-height: 44px; font-size: 14px; padding-block: 10px; }
details p { font-size: 15px; color: var(--muted); line-height: 2; }
.scene-heading { display: flex; align-items: center; justify-content: space-between; gap: 15px; margin-top: 36px; margin-bottom: 16px; }
.scene-heading h3 { font-size: 21px; }
.scene-heading p { color: #6c7e8b; font-size: 12px; margin-top: 6px; }
.scene-heading .note-tag { flex-shrink: 0; }
.scene-shell { min-width: 0; }
.scene-tabs { display: flex; gap: 5px; padding: 6px; border: 1px solid #cbdbe4; border-radius: 13px; background: #eaf1f5; margin-bottom: 15px; }
.scene-tabs button { flex: 1; min-height: 46px; padding: 8px 2px; font-size: 16px; border: 1px solid transparent; border-radius: 9px; white-space: nowrap; }
.scene-tabs button>span { font: 10px Georgia, serif; color: #718ca0; margin-right: 7px; }
.scene-tabs button[aria-selected=true] { background: #fff; border-color: #c1d4e1; box-shadow: 0 2px 6px #315d7510; }
.scene-panel { display: grid; border: 1px solid #bed1dd; border-radius: 18px; overflow: hidden; background: #fff; }
.scene-stage { position: relative; aspect-ratio: 4/3; overflow: hidden; touch-action: pan-y; min-width: 0; background: #d9eaf4; }
.scene-track { display: flex; width: 100%; height: 100%; transition: transform .5s cubic-bezier(.2,.7,.3,1); will-change: transform; }
.scene-slide { flex: 0 0 100%; width: 100%; height: 100%; position: relative; overflow: hidden; }
.scene-slide>img { width: 100%; height: 100%; object-fit: cover; }
.scene-image-label { position: absolute; left: 12px; top: 12px; padding: 4px 8px; border: 1px solid #a7c0d177; background: #f9fcffeb; border-radius: 5px; font-size: 9px; color: #52738b; z-index: 2; }
.hotspot { position: absolute; z-index: 3; display: flex; flex-direction: column; align-items: center; justify-content: center; transform: translate(-50%,-50%); min-height: 67px; min-width: 72px; padding: 8px; white-space: nowrap; }
.hotspot-dot { width: 31px; height: 31px; border: 2px solid #fff; outline: 1px solid #386c92; background: #386c92; color: white; display: grid; place-items: center; border-radius: 50%; box-shadow: 0 0 0 6px #ffffff80; font: 24px/1 var(--sans); }
.hotspot-label { background: #fffef5f0; color: #3c617a; border: 1px solid #b6cddd; border-radius: 5px; padding: 3px 7px; font-size: 10px; margin-top: 8px; }
.scene-swipe-toast { display: none; position: absolute; z-index: 4; bottom: 15px; left: 50%; transform: translateX(-50%); background: #fffef5ed; color: #4b6c83; border: 1px solid #adc9d9; border-radius: 18px; padding: 6px 13px; font-size: 11px; white-space: nowrap; pointer-events: none; }
.scene-swipe-toast.is-visible { display: block; }
.scene-info { padding: 23px 20px 16px; }
.scene-info h3 { font-size: 30px; letter-spacing: .06em; }
.scene-subtitle { font-size: 15px; color: #658196; margin-top: 5px; }
.scene-more { margin-top: 17px; border-top: 1px solid #d9e4ec; border-bottom: 1px solid #d9e4ec; }
.scene-more>summary { font-size: 14px; }
.scene-more-body { padding-bottom: 14px; }
.scene-more-scroll>p { font-size: 15px; line-height: 2; }
.reading-hint { color: #688195; font-size: 11px!important; margin-top: 15px; }
.scene-actions { display: flex; gap: 12px 22px; align-items: center; flex-wrap: wrap; margin-top: 14px; }
.text-button { display: inline-flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 44px; font-size: 13px; border-bottom: 1px solid #9bbace; padding: 5px 0; }
.text-button>span { font-size: 20px; }
.scene-swipe-hint { font-size: 10px; color: #748c9c; }
.scene-foot { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: 18px; padding-top: 10px; border-top: 1px dashed #c9dce7; color: #6c8495; font-size: 9px; }
.scene-foot a { padding-block: 10px; min-height: 44px; }
.explore-legend { font-size: 11px; color: #718492; line-height: 1.9; margin-top: 14px; }
.status { color: #8d5d3e; font-size: 14px; }.status:empty { display: none; }
.image-fallback { display: none; }.media-frame.failed { min-height: 170px; position: relative; }
.media-frame.failed>img { visibility: hidden; }.media-frame.failed>.image-fallback { display: block; position: absolute; top: 40%; left: 20px; right: 20px; text-align: center; font-size: 14px; color: #526f85; }
.section-lead { color: var(--muted); font-size: 16px; line-height: 2; }
.timeline { list-style: none; padding: 0; margin: 25px 0 0; position: relative; }
.timeline:before { content: ""; position: absolute; top: 18px; bottom: 20px; left: 10px; border-left: 1px dashed #91b4a6; }
.timeline li { position: relative; padding: 5px 0 25px 37px; }
.timeline li:before { content: ""; position: absolute; width: 11px; height: 11px; top: 18px; left: 5px; border: 2px solid #edf6ee; border-radius: 50%; outline: 1px solid #81a996; background: #81a996; }
.timeline-year { color: #3d7764; font: 31px/1.4 Georgia, serif; }
.timeline-year small { font-size: 19px; margin-left: 5px; }
.timeline h3 { font-size: 22px; margin-top: 6px; }
.timeline li>div>p { font-size: 15px; color: var(--muted); margin-top: 8px; line-height: 2; }
.timeline-more { margin-top: 5px; }
.timeline-more summary { font-size: 11px; color: #467560; }
.timeline-detail a { display: inline-flex; align-items: center; min-height: 44px; font-size: 11px; text-decoration: underline; text-underline-offset: 4px; }
.interpretation { display: block; font-size: 10px; color: #6f8782; }
.history-question { background: #f5faf6; border: 1px solid #bfd5c7; border-radius: 17px; padding: 23px 20px; margin-top: 6px; }
.history-question h3 { margin-top: 12px; font-size: 22px; }
.answer-options { display: grid; gap: 10px; margin-top: 16px; }
.answer-options button { min-height: 48px; padding: 11px 13px; border: 1px solid #b2ccbc; border-radius: 10px; background: white; text-align: left; font-size: 14px; }
.answer-options button[aria-pressed=true] { background: #e3f0e6; border-color: #659c7e; }
#history-answer { margin-top: 15px; font-size: 15px; color: #506f60; line-height: 2; }
.today-background { background: #fbf8f1; border-top: 1px solid #e5ddc8; }
.today-section .chapter-heading .eyebrow { color: #947344; }
.notebook { padding: 25px 20px; background: #fffefb; border: 1px solid #ddcfb3; border-radius: 17px; margin-top: 32px; position: relative; }
.notebook:before { content: ""; position: absolute; height: 14px; width: 70px; background: #a8c4d867; top: -7px; left: 27px; transform: rotate(-3deg); }
.notebook-top { display: flex; gap: 15px; align-items: center; justify-content: space-between; }
.notebook-top h3 { font-size: 24px; margin-top: 6px; }.notebook-top .eyebrow { font-size: 9px; }
.postcard-mark { white-space: nowrap; color: #997143; font: 28px Georgia, serif; }
.notebook-hint { color: #7b765f; font-size: 14px; margin-top: 13px; line-height: 1.9; }
.postcard-label { display: block; margin: 22px 0 8px; font-size: 16px; }
#postcard-message { display: block; width: 100%; min-height: 150px; resize: vertical; border: 1px solid #bacdda; border-radius: 12px; padding: 14px 15px; background: #f7fafb; color: var(--navy); font: 16px/1.9 var(--sans); }
#postcard-message::placeholder { color: #657c8a; }
#postcard-message:focus-visible { outline: 3px solid #527f9e; outline-offset: 3px; }
.postcard-input-foot { display: flex; flex-wrap: wrap; gap: 5px 16px; justify-content: space-between; margin-top: 9px; font-size: 13px; color: #607887; }
#postcard-counter { white-space: nowrap; margin-left: auto; }
.postcard-button { display: inline-flex; align-items: center; justify-content: center; gap: 18px; min-height: 48px; padding: 12px 20px; border-radius: 10px; background: #3c6c8b; color: #fff; font: 16px/1.5 var(--sans); text-align: center; }
#postcard-generate { margin-top: 22px; width: 100%; }
.postcard-button:disabled { opacity: .6; }
.postcard-result { margin-top: 24px; padding-top: 24px; border-top: 1px dashed #d3c8b3; }
.postcard-result[hidden], .postcard-share[hidden] { display: none; }
.postcard-result figure { max-width: 390px; margin-inline: auto; }
#postcard-image { width: 100%; height: auto; border-radius: 5px; box-shadow: 0 8px 24px #244a6514; -webkit-touch-callout: default; user-select: auto; }
.postcard-result figcaption, .postcard-save-hint { color: #607887; font-size: 13px; line-height: 1.9; margin-top: 12px; }
.postcard-save-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.postcard-save-actions>* { flex: 1 1 180px; }
.postcard-share { min-height: 48px; padding: 11px 16px; border: 1px solid #a7c0d0; border-radius: 10px; font-size: 16px; }
.notebook-result { font-size: 13px; color: #667b7d; line-height: 1.9; margin-top: 13px; }
.media-notebook { border-block: 1px solid #dacfb7; margin-top: 28px; }.media-notebook>summary { display: flex; align-items: center; justify-content: space-between; list-style: none; gap: 15px; padding: 15px 0; font-size: 15px; min-height: 58px; }.media-notebook>summary::-webkit-details-marker { display: none; }
.media-notebook-body { padding-bottom: 24px; }.archive-notice { font-size: 12px; color: #7c7967; line-height: 1.9; margin-bottom: 17px; }
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.gallery-card { padding: 0; text-align: left; min-width: 0; border: 1px solid #d3dfe4; border-radius: 9px; overflow: hidden; background: #fff; }
.gallery-frame { position: relative; }.gallery-frame img { width: 100%; height: auto; aspect-ratio: 4/3; object-fit: cover; }
.gallery-tag { display: none; }.gallery-caption { padding: 9px 7px; display: flex; justify-content: space-between; gap: 5px; }
.gallery-caption strong { display: block; font-size: 14px; font-family: var(--serif); font-weight: 400; }.gallery-caption small { display: block; font-size: 8px; color: #708391; margin-top: 3px; }.gallery-arrow { display: none; }
.archive-video { width: 100%; border: 1px solid #d7d1bd; border-radius: 11px; background: #fffdfa; display: flex; align-items: center; gap: 13px; padding: 18px 13px; margin-top: 17px; text-align: left; }
.archive-video .play-icon { display: grid; place-items: center; width: 40px; height: 40px; flex-shrink: 0; border: 1px solid #bfac88; border-radius: 50%; font-size: 24px; }
.archive-video strong { display: block; font: 20px var(--serif); }.archive-video small { display: block; font-size: 10px; color: #7e7d6c; margin-top: 5px; }.archive-video>span:last-child { margin-left: auto; font-size: 22px; }
.closing-note { text-align: center; padding-top: 44px; }.closing-note>span { font-size: 28px; color: #bba172; }.closing-note>p { font: 23px/1.9 var(--serif); margin-top: 10px; }.closing-note strong { font-weight: 400; color: #54798a; }.closing-note>.text-button { margin-top: 22px; }.back-home { display: block; font-size: 11px; margin: 10px auto 0; padding: 10px; width: max-content; min-height: 44px; color: #688291; }
.site-footer { display: flex; flex-direction: column; gap: 12px; padding-block: 26px calc(26px + var(--safe-nav)); color: #69818f; font-size: 10px; }.site-footer>span { font: 18px var(--serif); letter-spacing: .1em; }
.mobile-nav { position: fixed; left: 0; right: 0; bottom: 0; z-index: 15; display: grid; grid-template-columns: repeat(4, 1fr); gap: 2px; padding: 6px 8px calc(6px + env(safe-area-inset-bottom, 0px)); background: #f8fcffef; backdrop-filter: blur(12px); border-top: 1px solid #b6cedd; }
.mobile-nav a { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 52px; border-radius: 10px; font-size: 11px; color: #658297; line-height: 1.6; }.mobile-nav a>span { font: 21px/1.3 Georgia, serif; margin-bottom: 3px; }.mobile-nav a[data-section=details]>span { color: #ac617b; }.mobile-nav a[data-section=history]>span { color: #4c876d; }.mobile-nav a[data-section=today]>span { color: #b18750; }.mobile-nav a[aria-current] { background: #dfedf7; color: #2c5c7d; }
.modal[hidden] { display: none; }.modal { position: fixed; inset: 0; z-index: 40; display: flex; align-items: flex-end; justify-content: center; }.modal-shade { position: absolute; inset: 0; background: #21415c94; backdrop-filter: blur(6px); }
.modal-card { position: relative; width: 100%; max-height: 92vh; max-height: 92dvh; overflow-y: auto; overscroll-behavior: contain; background: #f9fcfe; border: 1px solid #b7d0e0; border-radius: 23px 23px 0 0; padding: 15px 22px calc(24px + env(safe-area-inset-bottom, 0px)); animation: sheet-in .25s ease-out; scrollbar-width: thin; }
.modal-top { display: flex; justify-content: space-between; align-items: center; gap: 15px; position: sticky; top: -15px; padding-block: 8px; margin-bottom: 15px; background: #f9fcfe; z-index: 3; }
.close-button { display: grid; place-items: center; min-height: 44px; min-width: 44px; border: 1px solid #bfd2df; border-radius: 50%; font: 26px/1 var(--sans); color: #4a718d; }
.detail-classification { font-size: 11px; color: #64879e; margin-top: 15px; }.modal-body h2 { font-size: 28px; margin: 11px 0 17px; }.modal-body p:not([class]) { color: #536f82; font-size: 16px; line-height: 2; margin-bottom: 15px; }
.modal-body img { width: 100%; height: auto; max-height: 45vh; object-fit: contain; border-radius: 12px; background: #e8f2f8; }.modal-body .media-frame { position: relative; min-height: 150px; }.modal-return { margin-top: 25px; }
.photo-tools { display: flex; justify-content: space-between; gap: 12px; margin-top: 14px; }.photo-tools button, .retry-button, .video-back { display: inline-flex; align-items: center; min-height: 44px; border: 1px solid #b5cddb; border-radius: 9px; padding: 7px 13px; font-size: 13px; background: #edf5fa; }
.video-player { width: 100%; max-height: 46vh; background: #21394c; display: block; border-radius: 12px; }.video-status { font-size: 14px!important; color: #557b92!important; margin-top: 14px; }.retry-button[hidden] { display: none; }
.media-empty { text-align: center; background: #edf5f9; border: 1px dashed #b2cbd9; border-radius: 15px; padding: 32px 18px; }.media-empty>span { display: block; font-size: 34px; }.media-empty strong { display: block; font: 23px var(--serif); margin: 10px 0 16px; }.media-empty p { font-size: 14px!important; }
.video-index { display: grid; gap: 10px; margin-top: 15px; }.video-index-item { display: flex; align-items: center; justify-content: space-between; width: 100%; border: 1px solid #c3d6e1; border-radius: 12px; text-align: left; padding: 16px; background: #f1f7fa; }.video-index-item strong { display: block; font: 22px var(--serif); }.video-index-item small { display: block; color: #678296; font-size: 11px; margin-top: 7px; }.video-index-item>span:last-child { font-size: 28px; }.video-back { margin-top: 15px; }
.noscript-message { padding: 20px; margin: 0 20px calc(20px + var(--safe-nav)); background: #fff; border-radius: 10px; font-size: 14px; color: #536f82; }
.motion-reduced { scroll-behavior: auto; }.motion-reduced *, .motion-reduced *:before, .motion-reduced *:after { animation: none!important; transition: none!important; }
@keyframes float-note { from { transform: translateY(0); } to { transform: translateY(-5px); } }
@keyframes sheet-in { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@media (min-width: 600px) {
  .wrap { width: calc(100% - 80px); }.hero { grid-template-columns: 1fr 1.1fr; align-items: center; gap: 15px; padding-top: 50px; }.hero h1 { font-size: 42px; }.hero-art { margin-right: -15px; margin-left: -20px; }.hero-sticker { top: 0; }
  .chapter-shortcuts { gap: 14px; margin-top: 38px; }.chapter-shortcuts a { min-height: 108px; }.chapter-shortcuts strong { font-size: 16px; }.chapter-shortcuts small { font-size: 11px; }
  .chapter-heading h2 { font-size: 32px; }.overview-intro, .detail-intro, .today-intro { grid-template-columns: 1fr 1fr; gap: 30px; align-items: center; }.building-profiles { grid-template-columns: repeat(3,1fr); gap: 13px; }.building-profiles article { flex-direction: column; gap: 12px; padding: 22px 18px 13px; }.building-profiles a { font-size: 11px; gap: 15px; }.building-profiles p:not(.profile-label) { min-height: 115px; }
  .scene-info { padding: 27px; }.gallery { gap: 15px; }.gallery-caption { padding: 12px; }.gallery-caption strong { font-size: 20px; }.gallery-caption small { font-size: 10px; }.gallery-arrow { display: block; }
  .modal { align-items: center; padding: 24px; }.modal-card { max-width: 720px; border-radius: 20px; padding-inline: 30px; }.answer-options { grid-template-columns: 1fr 1fr; }.notebook { padding: 30px; }
}
@media (min-width: 900px) {
  .chapter-heading h2 br { display: none; }
  .wrap { width: calc(100% - 120px); }.site-header { padding-block: 22px; }.desktop-nav { display: flex; gap: 27px; font-size: 12px; }.desktop-nav a { display: flex; align-items: center; min-height: 44px; }
  .hero { padding-block: 50px 20px; gap: 30px; }.hero h1 { font-size: 55px; margin-top: 19px; }.hero-description { font-size: 17px; }.hero-art { margin-right: -25px; }.hero-sticker { right: 6%; top: 2%; font-size: 12px; }.hero-note { font-size: 12px; }
  .chapter-shortcuts { margin-top: 18px; }.chapter-shortcuts a { flex-direction: row; justify-content: flex-start; gap: 14px; padding: 23px; min-height: 88px; }.chapter-shortcuts small { margin-left: auto; }.chapter-shortcuts a>span { font-size: 29px; }.chapter-shortcuts strong { font-size: 17px; }
  .chapter { padding-block: 70px; }.chapter-heading { margin-bottom: 35px; gap: 17px; }.chapter-heading h2 { font-size: 35px; }.chapter-number { display: block; margin-left: auto; color: #b7cddb88; font: 56px Georgia,serif; }.chapter-symbol { width: 50px; height: 57px; font-size: 33px; }
  .overview-intro, .detail-intro, .today-intro { grid-template-columns: 1.1fr 1fr; gap: 55px; }.section-copy h3, .observation-notes h3 { font-size: 29px; }.section-copy>p { font-size: 16px; }.building-profiles { gap: 20px; }.building-profiles article { display: flex; flex-direction: row; padding: 25px 23px 16px; }.building-profiles p:not(.profile-label) { min-height: 88px; }.building-profiles h3 { font-size: 28px; }
  .context-note { margin-top: 28px; padding: 25px; }.scene-heading { margin-top: 43px; }.scene-heading h3 { font-size: 26px; }.scene-tabs { max-width: 590px; }.scene-panel { grid-template-columns: 1.25fr 1fr; }.scene-stage { min-height: 455px; height: 100%; aspect-ratio: auto; }.scene-info { display: flex; flex-direction: column; justify-content: center; padding: 34px; }.scene-info h3 { font-size: 38px; }.scene-actions { gap: 15px 25px; }.scene-swipe-hint { display: none; }
  .timeline { display: grid; grid-template-columns: repeat(4,1fr); gap: 25px; margin-top: 34px; }.timeline:before { top: 10px; bottom: auto; left: 0; right: 0; border-left: 0; border-top: 1px dashed #91b4a6; }.timeline li { padding: 34px 0 0; }.timeline li:before { left: 1px; top: 5px; }.timeline-year { display: block; min-height: 66px; }.timeline h3 { font-size: 23px; }.timeline-year small { font-size: 17px; }.history-question { margin-top: 35px; padding: 29px; }.history-question h3 { font-size: 25px; }
  .notebook { margin-top: 42px; padding: 32px 36px; }.notebook-top h3 { font-size: 29px; }.notebook-hint { font-size: 15px; }.notebook-result { font-size: 14px; }.media-notebook { margin-top: 35px; }.gallery-caption strong { font-size: 23px; }
  .closing-note { padding-top: 58px; }.closing-note>p { font-size: 29px; }.site-footer { padding-block: 28px; flex-direction: row; justify-content: space-between; align-items: center; }.site-footer>p { text-align: right; }.mobile-nav { display: none; }
}
@media (max-width: 359px) {
  .wrap { width: calc(100% - 32px); }.site-header { gap: 10px; }.brand { font-size: 19px; gap: 8px; }.motion-toggle { font-size: 10px; padding-inline: 6px; }.hero h1 { font-size: 36px; }.hero { padding-top: 28px; }.hero-note { font-size: 10px; }.chapter-shortcuts { gap: 6px; }.chapter-shortcuts strong { font-size: 12px; }.chapter-shortcuts small { font-size: 8px; }.chapter-heading { gap: 10px; }.chapter-heading h2 { font-size: 22px; }.chapter-symbol { width: 39px; height: 46px; }.scene-tabs button { font-size: 14px; }.scene-tabs button>span { margin-right: 4px; }.scene-info { padding-inline: 17px; }.hotspot { min-width: 63px; }.hotspot-label { font-size: 9px; }.scene-heading h3 { font-size: 19px; }.building-profiles article { padding-inline: 17px; }.context-note { gap: 11px; padding-inline: 16px; }.notebook { padding-inline: 17px; }.notebook-top h3 { font-size: 22px; }.notebook-top .eyebrow { font-size: 8px; }.gallery-caption strong { font-size: 12px; }.mobile-nav a { font-size: 10px; }
}
@media (max-width: 899px) { html { scrollbar-width: none; } html::-webkit-scrollbar { display: none; } }
@media (max-width: 599px) {
  .hero { padding-top: 28px; }.hero h1 { margin-top: 13px; }
  .hero-description { margin-top: 14px; }.primary-button { margin-top: 20px; }.hero-note { margin-top: 14px; }
  .hero-art { width: 100%; max-width: 300px; min-height: 0; margin: 0 auto; }
  .chapter-shortcuts { margin-top: 22px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *:before, *:after { animation: none!important; transition: none!important; } }