/* Title-led scroll scenes: the headline, artwork and active caption stay together. */
.experience-scroll { height: 250vh; min-height: 1700px; position: relative; }
.experience-pinned { position: sticky; top: 86px; }
.experience-pinned .section-heading { padding: 24px 0 30px; }
.experience-pinned .section-heading.reveal, .fragment-sticky .fragment-heading.reveal { transform: none; }
.experience-scene { display: grid; grid-template-columns: minmax(0,1.15fr) minmax(0,1fr); gap: 100px; align-items: center; }
.experience-stage { position: relative; top: auto; height: auto; min-height: 0; padding-bottom: 12px; }
.feature-sequence { position: relative; height: 270px; margin-top: 0; }
.feature-chapter { position: absolute; inset: 0; min-height: 0; padding: 0; opacity: 0; transform: translateY(14px); pointer-events: none; transition: opacity .45s,transform .55s var(--ease); }
.feature-chapter.current { opacity: 1; transform: translateY(0); }
.experience .section-heading h2 { margin-top: 12px; }

.fragment-journey { height: 250vh; min-height: 1850px; margin-top: 16px; }
.fragment-sticky { position: sticky; top: 86px; height: auto; padding-top: 13px; }
.fragment-sticky .fragment-heading { margin: 0 auto 10px; width: min(1100px,calc(100% - 60px)); }
.fragment-sticky .fragment-heading h2 { font-size: clamp(30px,4.5vh,44px); line-height: 1.3; margin: 12px 0 13px; }
.fragment-sticky .fragment-heading>p:last-child { font-size: 12px; line-height: 1.8; }
.fragment-viewport { height: clamp(260px,38vh,360px); }
.fragment-tile { top: 10px; width: clamp(165px,24vh,225px); height: auto; }
.fragment-story { min-height: 101px; }
.fragment-story h3 { font-size: 20px; margin-top: 7px; }
.fragment-story p { font-size: 13px; margin-top: 10px; min-height: 44px; }
.fragment-navigation { margin-top: 12px; }
.fragment-hint { margin-top: 12px; }
.story-seal { min-width: 110px; font-size: 45px; white-space: nowrap; }
.story-seal small { font-size: 8px; letter-spacing: .04em; color: #ad95c17a; }
.box-story-label { display: block; font-size: 8px; letter-spacing: .1em; color: #b399d1; margin-bottom: 9px; }

/* Existing public contact destinations from yifanovo.com. */
.hero-contacts { display: flex; align-items: center; flex-wrap: wrap; column-gap: 17px; row-gap: 9px; margin-top: 22px; position: relative; z-index: 8; }
.hero-contacts>a, .wechat-contact>button { display: inline-flex; align-items: center; gap: 6px; padding: 5px 0; font-size: 10px; line-height: 1.5; color: #8e819c; transition: color .25s; white-space: nowrap; }
.hero-contacts>a:hover, .wechat-contact>button:hover, .wechat-contact>button[aria-expanded="true"] { color: #cab1ec; }
[data-contact-icon] { display: inline-flex; align-items: center; flex: none; }
.hero-contacts svg { width: 15px; height: 15px; fill: currentColor; stroke: none; }
.hero-contacts .wechat-contact { position: relative; }
.wechat-popover { position: absolute; left: auto; right: 0; top: calc(100% + 9px); width: 177px; border-radius: 12px; padding: 15px 16px 12px; background: #231a30f5; box-shadow: 0 14px 38px #0006; z-index: 25; animation: qr-enter .25s var(--ease); }
.wechat-popover[hidden] { display: none; }
.wechat-popover::before { content: ''; position: absolute; top: -11px; left: 0; width: 100%; height: 12px; }
.wechat-popover img { width: 143px; height: 143px; border-radius: 4px; background: white; image-rendering: pixelated; }
.wechat-popover p { font-size: 8px; line-height: 1.8; text-align: center; color: #b9a4ce; margin-top: 9px; }
.hero-footnote { margin-top: 19px; }
@keyframes qr-enter { from { opacity: 0; transform: translateY(-5px); } to { opacity: 1; transform: none; } }

@media(max-width:1150px) {
  .experience-scene { gap: 60px; }
  .hero-contacts { column-gap: 14px; }
  .hero-contacts>a, .wechat-contact>button { font-size: 9px; }
}
@media(max-width:850px) {
  .hero-contacts { justify-content: center; }
  .experience-scene { gap: 35px; }
  .experience-pinned { top: 86px; }
  .experience-pinned .section-heading { padding: 20px 0 28px; }
  .fragment-sticky { top: 86px; }
}
@media(min-width:601px) and (max-height:850px) {
  .experience-phone-wrap { width: 208px; height: 435px; }
  .demo-phone { transform-origin: top left; transform: scale(.78) rotate(-3deg); }
  .demo-phone[data-phase="1"] { transform: scale(.78); }
  .demo-phone[data-phase="2"] { transform: scale(.78) rotate(3deg); }
  .experience-pinned .section-heading { padding: 16px 0 20px; }
  .experience-pinned .section-heading h2 { font-size: 30px; }
  .experience-pinned, .fragment-sticky { top: 80px; }
  .fragment-sticky .fragment-heading h2 { font-size: 32px; }
  .fragment-sticky .fragment-heading { margin-bottom: 8px; }
  .fragment-viewport { height: 270px; }
  .fragment-tile { width: 180px; }
  .fragment-navigation button { height: 30px; width: 30px; }
}
@media(max-width:600px) {
  .hero-contacts { display: grid; grid-template-columns: repeat(3,max-content); column-gap: 18px; row-gap: 3px; justify-content: center; margin-top: 17px; }
  .hero-contacts>a, .wechat-contact>button { font-size: 9px; }
  .hero-contacts svg { width: 14px; height: 14px; }
  .hero-footnote { margin-top: 16px; }
  .story-seal { min-width: 77px; font-size: 31px; }
  .story-seal small { font-size: 6px; }
  .experience-scroll { height: 245vh; min-height: 1700px; }
  .experience-pinned { top: 75px; }
  .experience-pinned .section-heading { padding: 10px 0 17px; gap: 10px; }
  .experience-pinned .section-heading h2 { font-size: 24px; margin-top: 8px; }
  .experience-pinned .section-heading .eyebrow { font-size: 9px; }
  .experience-pinned .section-heading>p { font-size: 10px; }
  .experience-scene { grid-template-columns: minmax(0,1fr); gap: 12px; }
  .experience-stage { padding: 0; height: auto; }
  .experience-phone-wrap { width: 160px; height: 334px; }
  .demo-phone { transform: scale(.6) rotate(-3deg); }
  .demo-phone[data-phase="1"] { transform: scale(.6); }
  .demo-phone[data-phase="2"] { transform: scale(.6) rotate(3deg); }
  .experience-orbit { width: 285px; height: 340px; }
  .demo-phase-indicator { margin-top: 13px; }
  .demo-note { margin-top: 7px; font-size: 6px; }
  .feature-sequence { height: 145px; margin-top: 0; }
  .feature-chapter { max-width: none; min-height: 0; padding: 0 5px; justify-content: start; }
  .feature-chapter .chapter-index { display: none; }
  .feature-chapter h3 { font-size: 21px; }
  .feature-chapter p { font-size: 11px; line-height: 1.8; margin-top: 9px; }
  .feature-chapter .feature-tag { font-size: 6px; margin-top: 9px; }
  .fragment-journey { height: 250vh; min-height: 1750px; margin-top: 14px; }
  .fragment-sticky { top: 76px; padding: 7px 0 0; }
  .fragment-sticky .fragment-heading { width: calc(100% - 40px); margin: 0 auto 7px; }
  .fragment-sticky .fragment-heading .eyebrow { font-size: 8px; letter-spacing: .04em; }
  .fragment-sticky .fragment-heading h2, html[lang="en"] .fragment-sticky .fragment-heading h2 { font-size: 26px; line-height: 1.25; margin: 8px 0 9px; }
  .fragment-sticky .fragment-heading>p:last-child { font-size: 10px; line-height: 1.7; }
  .fragment-viewport { height: clamp(225px,33vh,270px); }
  .fragment-tile { width: clamp(150px,22vh,178px); top: 8px; }
  .fragment-story { width: calc(100% - 45px); min-height: 94px; }
  .fragment-story h3 { font-size: 18px; margin-top: 5px; }
  .fragment-story p { font-size: 11px; line-height: 1.75; margin-top: 7px; min-height: 38px; }
  .fragment-navigation { margin-top: 5px; gap: 20px; }
  .fragment-navigation button { width: 30px; height: 30px; font-size: 14px; }
  .fragment-hint { font-size: 7px; margin-top: 9px; }
}
@media(max-width:600px) and (max-height:760px) {
  .experience-pinned { top: 73px; }
  .experience-phone-wrap { width: 145px; height: 301px; }
  .demo-phone { transform: scale(.54) rotate(-3deg); }
  .demo-phone[data-phase="1"] { transform: scale(.54); }
  .demo-phone[data-phase="2"] { transform: scale(.54) rotate(3deg); }
  .experience-pinned .section-heading h2 { font-size: 22px; }
  .feature-sequence { height: 145px; }
}
@media(prefers-reduced-motion:reduce) {
  .experience-scroll, .fragment-journey { height: auto; min-height: 0; }
  .experience-pinned, .fragment-sticky { position: relative; top: auto; }
  .feature-sequence { height: auto; }
  .feature-chapter { position: relative; inset: auto; min-height: 0; padding: 25px 0; opacity: 1; transform: none; }
  .fragment-viewport { height: auto; }
  .fragment-tile { width: auto; top: auto; }
}

/* Composition refinements: optical alignment and a larger viewport-led stage. */
.site-header nav { position: absolute; left: 50%; transform: translateX(-50%); justify-content: center; }
.brand-dot { display: inline-block; padding-left: 6px; letter-spacing: 0; }
.button { position: relative; justify-content: center; gap: 0; min-width: 154px; padding-inline: 42px; text-align: center; }
.button>span[aria-hidden] { position: absolute; right: 20px; }
.header-cta { position: relative; justify-content: center; padding-inline: 30px; }
.header-cta>span[aria-hidden] { position: absolute; right: 13px; }
#memory-sky { opacity: .85; }
.logo-caption p { max-width: 260px; line-height: 1.8; }
.memory-box-story { margin-top: 46px; padding: 34px 0; grid-template-columns: minmax(260px,.9fr) minmax(0,1fr); gap: 50px; align-items: center; border-bottom: 1px solid var(--line); }
.box-design { display: grid; grid-template-columns: 1.1fr 1fr; align-items: center; gap: 22px; }
.box-blueprint { position: relative; display: grid; place-items: center; padding: 14px 6px; border: 1px solid #c2a6fa19; border-radius: 22px; background: radial-gradient(ellipse,#b695ee0a,transparent 70%); }
.box-blueprint::before,.box-blueprint::after { content: ''; position: absolute; background: #c2a6fa13; pointer-events: none; }
.box-blueprint::before { height: 1px; left: 0; right: 0; top: 44%; }
.box-blueprint::after { width: 1px; top: 0; bottom: 0; left: 50%; }
#box-study-art { display: block; width: 140px; height: 140px; }
.box-blueprint .box-monogram { padding: 0 0 7px; font-size: 12px; letter-spacing: .2em; }
.box-icon-study { text-align: center; }
.box-icon-study img { width: 108px; height: 108px; margin: auto; border-radius: 28px; box-shadow: 0 15px 40px #0004,0 0 32px #b295e216; transform: rotate(-8deg); transition: transform .6s var(--ease); }
.box-design:hover .box-icon-study img { transform: rotate(0) translateY(-6px); }
.box-design:hover .memory-box-mark { filter: drop-shadow(0 0 12px #b69be87a); }
.box-icon-study figcaption { color: #9a87af; font: 6px monospace; letter-spacing: .08em; margin-top: 22px; }
.box-story-label { font-size: 12px; margin-bottom: 17px; }
.memory-box-story p { font-size: 13px; line-height: 2.15; }
.experience-scroll { height: 235vh; min-height: 1500px; }
.experience-pinned { min-height: calc(100svh - 108px); display: flex; flex-direction: column; justify-content: center; }
.experience-pinned .section-heading { padding: 12px 0 26px; }
.experience-pinned .section-heading h2 { font-size: clamp(30px,3.3vw,48px); }
.experience-scene { grid-template-columns: 1.15fr 1fr; gap: 70px; }
.experience-phone-wrap { width: calc(267px * var(--demo-scale,1)); height: calc(557px * var(--demo-scale,1)); }
.demo-phone { transform-origin: top left; transform: scale(var(--demo-scale,1)) rotate(-3deg); }
.demo-phone[data-phase="1"] { transform: scale(var(--demo-scale,1)); }
.demo-phone[data-phase="2"] { transform: scale(var(--demo-scale,1)) rotate(3deg); }
.experience-orbit { width: min(580px,43vw); height: 65vh; top: 0; }
.feature-sequence { height: 290px; }
.feature-chapter { max-width: 480px; }
.feature-chapter h3 { font-size: clamp(26px,2.7vw,38px); text-wrap: balance; }
.feature-chapter p { font-size: 15px; line-height: 2; }
.feature-chapter .feature-tag { margin-top: 25px; }
.experience { padding-bottom: 65px; }
.fragment-journey { height: 235vh; min-height: 1500px; }
.fragment-sticky { min-height: calc(100svh - 110px); display: flex; flex-direction: column; justify-content: center; padding-top: 10px; }
.fragment-sticky .fragment-heading h2 { font-size: clamp(32px,5vh,52px); margin: 10px 0 12px; }
.fragment-sticky .fragment-heading>p:last-child { font-size: 13px; }
.fragment-viewport { flex: none; height: clamp(295px,calc(100svh - 470px),585px); perspective: 1400px; margin: 8px 0 12px; }
.fragment-tile { width: clamp(210px,calc((100svh - 510px)*.714),390px); height: auto; top: 8px; border-radius: 9px; background: #17111fff; box-shadow: 0 24px 55px #0007; }
.fragment-tile::after { content: ''; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; opacity: 0; background: radial-gradient(ellipse at var(--light-x,50%) var(--light-y,50%),#dac2ff23,transparent 65%),linear-gradient(115deg,transparent 20%,#e4caff15 46%,transparent 65%); transition: opacity .5s; }
.fragment-tile.active::after { opacity: 1; }
.fragment-tile.active { outline: 1px solid #d8c0ff24; outline-offset: 4px; }
.fragment-story { min-height: 103px; width: min(600px,calc(100% - 50px)); }
.fragment-story h3 { font-size: 23px; }
.fragment-story p { font-size: 14px; }
.fragment-navigation { margin-top: 7px; }
.fragment-hint { margin-top: 10px; }
.motion-paused .fragment-tile::after { animation-play-state: paused; }
@media(min-width:601px) and (max-width:1000px) {
  .site-header nav { gap: 20px; font-size: 11px; }
  .header-actions { gap: 16px; }
  .experience-scene { gap: 35px; }
  .feature-chapter p { font-size: 13px; }
  .memory-box-story { gap: 25px; grid-template-columns: 1fr 1fr; }
  .box-design { gap: 12px; }
  #box-study-art { width: 105px; height: 105px; }
  .box-icon-study img { width: 80px; height: 80px; border-radius: 22px; }
}
@media(max-width:600px) {
  .button { padding-inline: 39px; min-width: 145px; }
  .button>span[aria-hidden] { right: 17px; }
  .header-cta { padding-inline: 25px; }
  .header-cta>span[aria-hidden] { right: 10px; }
  .logo-caption p { font-size: 9px; max-width: 225px; }
  .hero-copy .eyebrow { letter-spacing: .035em; }
  .memory-box-story { grid-template-columns: 1fr; padding: 26px 0; gap: 26px; }
  .box-design { max-width: 320px; width: 100%; margin: auto; gap: 30px; }
  #box-study-art { width: 122px; height: 122px; }
  .box-icon-study img { width: 96px; height: 96px; border-radius: 25px; }
  .box-story-label { font-size: 11px; }
  .memory-box-story p { font-size: 12px; }
  .experience-scroll,.fragment-journey { height: 235vh; min-height: 1500px; }
  .experience-pinned { min-height: calc(100svh - 88px); }
  .experience-pinned .section-heading { padding: 6px 0 16px; }
  .experience-pinned .section-heading h2 { font-size: 24px; }
  .experience-scene { grid-template-columns: 1fr; gap: 15px; }
  .experience-orbit { width: 310px; height: 380px; }
  .feature-sequence { height: 148px; }
  .feature-chapter h3 { font-size: 22px; }
  .feature-chapter p { font-size: 12px; margin-top: 8px; line-height: 1.8; }
  .feature-chapter .feature-tag { margin-top: 10px; }
  .fragment-sticky { min-height: calc(100svh - 92px); }
  .fragment-sticky .fragment-heading h2,html[lang="en"] .fragment-sticky .fragment-heading h2 { font-size: 27px; margin: 8px 0 9px; }
  .fragment-sticky .fragment-heading>p:last-child { font-size: 10px; }
  .fragment-viewport { height: clamp(255px,calc(100svh - 465px),405px); perspective: 950px; margin: 6px 0 8px; }
  .fragment-tile { width: clamp(166px,calc((100svh - 500px)*.714),260px); top: 8px; }
  .fragment-story { min-height: 88px; }
  .fragment-story h3 { font-size: 20px; }
  .fragment-story p { font-size: 12px; }
  .fragment-navigation { margin-top: 5px; }
}
@media(max-width:600px) and (max-height:760px) {
  .experience-pinned .section-heading h2 { font-size: 22px; }
  .feature-sequence { height: 138px; }
  .feature-chapter p { font-size: 11px; }
  .fragment-sticky .fragment-heading h2,html[lang="en"] .fragment-sticky .fragment-heading h2 { font-size: 25px; }
}
@media(prefers-reduced-motion:reduce) {
  .experience-scroll,.fragment-journey { height: auto; min-height: 0; }
  .experience-pinned,.fragment-sticky { min-height: 0; display: block; }
  .feature-sequence,.fragment-viewport { height: auto; }
  .fragment-tile { width: auto; outline: none!important; box-shadow: none; background: none; }
  .fragment-tile::after { display: none; }
}