/* A restrained product-page hierarchy. AI Access is deliberately outside
   this revision while its replacement illustration is being prepared. */
#main > :not(.ai-section) {
  --ink: #1d1d1f;
  --muted: #626269;
  --line: #e4e4e8;
  --wash: #f5f5f7;
  color: var(--ink);
  letter-spacing: 0;
}
.site-header { height: 68px; border-color: #e8e8ed; background: #ffffffeb; }
.nav-wrap { max-width: 1320px; }
.site-header .brand { font-size: 19px; letter-spacing: -.02em; }
.site-header .brand img { width: 34px; height: 34px; }
.desktop-nav { font-weight: 400; gap: 24px; }
.site-header .button { border-radius: 99px; min-height: 38px; padding: 8px 18px; font-weight: 400; }
#main > :not(.ai-section).container,
#main > :not(.ai-section) > .container { max-width: 1200px; }
#main > :not(.ai-section) .small-label { font-size: .875rem; font-weight: 500; letter-spacing: .04em; }
#main > :not(.ai-section) h2 {
  font-family: var(--heading); font-size: clamp(2rem, 3.3vw, 2.75rem);
  font-weight: 600; line-height: 1.18; letter-spacing: -.035em; text-wrap: balance;
}
html[lang='zh-CN'] #main > :not(.ai-section) h2 { font-weight: 500; line-height: 1.4; letter-spacing: -.015em; }
#main > :not(.ai-section) h3 { font-size: 1.5rem; line-height: 1.35; letter-spacing: -.025em; text-wrap: balance; }
html[lang='zh-CN'] #main > :not(.ai-section) h3 { font-weight: 500; line-height: 1.5; letter-spacing: 0; }
#main > :not(.ai-section) .text-link { font-size: 1rem; font-weight: 400; line-height: 1.6; }
#main > :not(.ai-section) .button { border-radius: 99px; min-height: 50px; padding: 12px 24px; font-size: 1rem; font-weight: 400; box-shadow: none; }
#main > :not(.ai-section) .button:hover { transform: none; }
#main > :not(.ai-section) .button-white { color: var(--blue); border-color: #bfcaf0; }
.hero { padding: 76px 24px 76px; }
.hero-overline, html[lang='zh-CN'] .hero-overline { font-size: .875rem; letter-spacing: .045em; font-weight: 500; }
.hero-overline .short-line { display: none; }
#main .hero h1 { font-size: clamp(3rem, 5.2vw, 4.5rem); font-weight: 600; line-height: 1.09; letter-spacing: -.055em; margin: 24px 0 28px; }
html[lang='zh-CN'] #main .hero h1 { font-size: clamp(2.5rem, 4.65vw, 4rem); font-weight: 500; letter-spacing: -.025em; line-height: 1.3; }
#main .hero h1 em { color: #626269; font-weight: inherit; }
#main .hero .hero-description { font-size: 1.125rem; line-height: 1.75; max-width: 47rem; margin-bottom: 28px; text-wrap: pretty; }
html[lang='en'] .hero-description .hero-sentence { display: block; text-wrap: balance; }
.hero-secondary { margin-top: 20px; gap: 28px; }
.hero-secondary .text-link { color: var(--blue); }
.hero .access-note { margin-top: 24px; font-size: .8125rem; color: #6e6e73; }
.hero .hero-note, html[lang='zh-CN'] .hero .hero-note { color: #6e6e73; font-size: .8125rem; letter-spacing: 0; margin-top: 7px; }
.tour-section { margin-bottom: 96px; }
.tour-title-row { gap: 64px; margin-bottom: 32px; }
#main .tour-title-row h2 { font-size: 2rem; line-height: 1.28; font-weight: 500; letter-spacing: -.025em; }
html[lang='zh-CN'] #main .tour-title-row h2 { font-size: 2rem; line-height: 1.4; }
.tour-title-row > div, html[lang='zh-CN'] .tour-title-row > div { flex: 1 1 60%; min-width: 0; }
.tour-title-row > p, html[lang='zh-CN'] .tour-title-row > p { flex: 1 1 40%; font-size: 1rem; text-align: left; line-height: 1.75; }
.video-frame { border-radius: 18px; box-shadow: 0 8px 36px #1d1d1f08; }
.video-under { margin: 20px 0 24px; }
.video-under p { color: #6e6e73; max-width: 880px; }
.tour-chapters { border-color: #e4e4e8; margin-bottom: 24px; }
.tour-chapters button { padding: 16px 12px; }
.tour-chapters strong { line-height: 1.5; }
.workspace::before { display: none; }
.workspace-top { align-items: flex-end; gap: 40px; margin-bottom: 32px; padding-inline: 0; }
.workspace-top > div { min-width: 0; }
#main .workspace-top h2 { font-size: 2rem; line-height: 1.28; font-weight: 500; letter-spacing: -.025em; margin: 11px 0 0; }
html[lang='zh-CN'] #main .workspace-top h2 { line-height: 1.4; }
.workspace-top > .quiet { flex: 0 0 auto; margin: 0; line-height: 1.75; }
.workspace .quiet { font-size: .875rem; }
.workspace-tabs { background: #f5f5f7; border: 0; border-radius: 18px 18px 0 0; padding: 10px; gap: 3px; }
.workspace-tabs button { padding-block: 12px; border-radius: 9px; }
.workspace-tabs button[aria-selected=true] { font-weight: 500; box-shadow: 0 2px 8px #00000006; }
#workspace-panel { border: 1px solid #e8e8ed; border-radius: 0 0 18px 18px; box-shadow: 0 10px 40px #1d1d1f07; }
.workspace-caption { padding: 18px 32px; min-height: 0; border-top: 0; grid-template-columns: minmax(0, 1fr) auto; align-content: start; }
#workspace-panel > .screenshot-button { border-top: 1px solid #e8e8ed; aspect-ratio: 2940 / 1888; overflow: hidden; }
#workspace-image { display: block; width: 100%; height: 100%; aspect-ratio: 2940 / 1888; object-fit: cover; object-position: center top; }
#workspace-status { margin: 0; color: var(--muted); font-size: .875rem; }
#workspace-status:not(:empty) { padding: 8px 32px; }
.caption-count { width: 5.5em; text-align: right; font-variant-numeric: tabular-nums; }
.workspace-caption strong { display: block; font-size: 1.25rem; line-height: 1.4; min-height: var(--workspace-title-height, 0px); align-self: start; }
.workspace-caption p { font-size: 1rem; line-height: 1.5; max-width: 52em; margin-top: 6px; min-height: var(--workspace-description-height, 0px); align-self: start; }
.view-details { padding: 16px 32px 18px; background: #fafafa; gap: 28px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.view-detail { display: grid; align-content: start; gap: 4px; }
.view-detail, .view-detail strong { font-size: .9375rem; line-height: 1.5; }
.view-detail strong { margin: 0; min-height: var(--workspace-detail-title-height, 0px); }
.view-detail p { min-height: var(--workspace-detail-body-height, 0px); }
.principles { font-size: .875rem; padding-block: 32px; gap: 24px; }
.principles span+span::before { display: none; }
.workflow-section, .discovery-section { padding-block: 104px; }
.section-heading { grid-template-columns: 1.3fr 1fr; gap: 72px; margin-bottom: 48px; }
.section-heading > p { max-width: 440px; font-size: 1.0625rem; line-height: 1.8; }
.workflow-steps { margin-top: 52px; gap: 48px; }
.workflow-steps h3 { margin-top: 18px; }
.workflow-steps p { max-width: none; }
.files-section { background: #f5f5f7; border: 0; padding-block: 104px; }
.feature-grid { gap: 80px; grid-template-columns: 1fr 1.1fr; }
.feature-copy > p { max-width: 29em; }
.feature-copy > p, .workflow-steps p, .scenario-text > p, .capability-card p, .ownership-grid p, .origin-copy > p { font-size: 1.0625rem; line-height: 1.8; }
.paper-diagram { border: 0; border-radius: 20px; padding: 32px; box-shadow: 0 4px 24px #00000005; }
.diagram-heading { letter-spacing: .02em; }
.paper-object { background: #f5f7ff; }
.file-list > div { border-color: #e8e8ed; }
.placement-row { flex-wrap: wrap; }
.paper-diagram figcaption { color: #6e6e73; font-size: .8125rem; }
.image-trigger { border-color: #e4e4e8; border-radius: 14px; box-shadow: 0 8px 30px #1d1d1f06; }
.discovery-layout { gap: 48px; }
.monitor-list strong { font-size: 1.1875rem; }
.monitor-list button > span > span { font-size: .9375rem; }
.discovery-image figcaption, .scenario-panel figcaption { font-size: .8125rem; color: #6e6e73; }
.scenarios-section { background: #f5f5f7; border: 0; padding-block: 104px; }
.scenario-tabs { gap: 32px; border-color: #d8d8de; }
.scenario-tabs button { color: #626269; padding-block: 16px; }
.scenario-text li { font-size: 1rem; }
.scenario-panel { gap: 64px; }
.capabilities-section { padding-top: 104px; }
.capability-grid { gap: 24px; }
.capability-card { border: 0; border-radius: 20px; background: #f5f5f7; padding: 36px; }
.capability-card p { margin-bottom: 24px; }
.capability-card h3 { margin-block: 20px 16px; }
.capability-index { color: #6e6e73; font-size: .8125rem; letter-spacing: .025em; }
.capability-wide { padding: 40px; gap: 56px; background: #f0f3fa; max-height: none; }
.capability-shot { border-radius: 10px; }
.ownership-section { padding-block: 104px 88px; }
.ownership-grid { grid-template-columns: 1.2fr 1fr 1fr; gap: 48px; margin-top: 24px; }
#main .ownership-grid h2 { font-size: 2rem; }
#main .ownership-grid h3 { font-size: 1.1875rem; }
.resources-section { padding-top: 96px; }
.resource-grid > a { border: 0; background: #f5f5f7; border-radius: 20px; padding: 32px; }
.resource-grid > a:hover { transform: none; background: #ededf1; }
.resource-grid h3 { margin-top: 30px; }
.resource-type, .repository-note { font-size: .8125rem; color: #6e6e73; }
.resource-action { font-size: 1rem; font-weight: 400; }
.faq-section { padding-block: 104px; gap: 72px; }
#main .faq-intro h2 { font-size: 2rem; }
.faq-list summary { font-size: 1.0625rem; padding-block: 24px; }
.faq-list p { font-size: 1rem; line-height: 1.8; }
.origin-section { gap: 72px; padding-block: 80px; }
#main .origin-copy h2 { font-size: 2rem; }
.start-section { margin-top: 24px; padding-block: 88px; }
.start-section > p { font-size: 1.0625rem; }
.start-section > .setup-note { font-size: .875rem; }
.download-layout { gap: 64px; }
.download-layout p { font-size: 1rem; }
.download-steps li { font-size: .9375rem; }
.download-project > .access-note { font-size: .8125rem; }
.prompt-label { font-size: .875rem; color: #626269; }
#install-prompt { font-size: .9375rem; line-height: 1.8; border-radius: 14px; padding: 20px; color: #424249; background: #f5f5f7; border-color: #e4e4e8; }
.site-footer { padding-block: 28px; }
@media (max-width: 1050px) {
  .desktop-nav { gap: 18px; }
  .section-heading, .feature-grid, .scenario-panel { gap: 40px; }
  .ownership-grid { gap: 28px; }
  .tour-title-row { gap: 36px; }
  .capability-wide, .download-layout { gap: 36px; }
  .tour-chapters { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 900px) {
  .section-heading { grid-template-columns: 1fr; gap: 24px; }
  .section-heading > p { max-width: 38em; }
  .feature-grid { grid-template-columns: 1fr; gap: 36px; }
  .feature-copy > p { max-width: 42em; }
  .paper-diagram { width: 100%; max-width: 540px; margin-inline: auto; }
  .diagram-heading { display: flex; font-size: .75rem; }
  .diagram-key { margin-top: 0; }
  .file-list > div { font-size: .875rem; }
  .placement-row span { font-size: .75rem; }
  .discovery-layout { grid-template-columns: 1fr; gap: 32px; }
  .scenario-panel { grid-template-columns: 1fr; gap: 32px; }
  .ownership-grid { grid-template-columns: 1fr 1fr; }
  .ownership-grid h2 { grid-column: 1/-1; }
  .faq-section { gap: 40px; }
}
@media (max-width: 720px) {
  .site-header { height: 62px; }
  .nav-wrap { padding-inline: 20px; }
  .site-header .brand { font-size: 1.0625rem; gap: 7px; }
  .site-header .brand img { width: 30px; height: 30px; }
  .site-header .button { font-size: .8125rem; padding-inline: 13px; min-height: 36px; }
  #main > :not(.ai-section).container, #main > :not(.ai-section) > .container { width: calc(100% - 40px); }
  .hero { padding: 56px 20px 60px; }
  #main .hero h1 { font-size: clamp(2.5rem, 8vw, 3.5rem); line-height: 1.12; letter-spacing: -.045em; margin-block: 22px 24px; }
  html[lang='zh-CN'] #main .hero h1 { font-size: clamp(1.75rem, 7.9vw, 2.875rem); line-height: 1.36; letter-spacing: -.025em; }
  .hero-overline, html[lang='zh-CN'] .hero-overline { font-size: .8125rem; letter-spacing: .02em; }
  #main .hero .hero-description { font-size: 1.0625rem; line-height: 1.8; max-width: 30em; }
  #main > :not(.ai-section) .button { font-size: .9375rem; min-height: 48px; }
  #main > :not(.ai-section) .text-link { font-size: .9375rem; }
  .hero-secondary { gap: 24px; }
  .hero .access-note { max-width: 28em; margin-inline: auto; line-height: 1.7; font-size: .8125rem; }
  .hero .hero-note { max-width: 28em; line-height: 1.7; }
  #main > :not(.ai-section) h2 { font-size: 2rem; letter-spacing: -.03em; }
  #main .tour-title-row h2, html[lang='zh-CN'] #main .tour-title-row h2 { font-size: 1.75rem; }
  #main > :not(.ai-section) h3 { font-size: 1.375rem; }
  .tour-title-row { display: block; margin-bottom: 26px; }
  .tour-title-row > p { margin-top: 18px; font-size: 1rem; }
  .tour-section { margin-bottom: 64px; }
  .video-frame { border-radius: 12px; }
  .video-under { margin-top: 16px; flex-wrap: wrap; gap: 8px; }
  .video-under > span { font-size: .8125rem; }
  .tour-chapters { grid-template-columns: repeat(2, 1fr); }
  .tour-chapters button { display: flex; flex-direction: row; align-items: baseline; gap: 10px; padding: 14px 8px; }
  .tour-chapters strong { font-size: .8125rem; }
  .tour-chapters span { font-size: .75rem; }
  .workspace-top { display: block; margin-bottom: 26px; }
  #main .workspace-top h2, html[lang='zh-CN'] #main .workspace-top h2 { font-size: 1.75rem; }
  .workspace-top > .quiet { margin-top: 18px; max-width: none; font-size: .875rem; }
  .workspace-tabs { border-radius: 12px 12px 0 0; padding: 7px; }
  .workspace-tabs button { min-width: 148px; }
  .workspace-caption { padding: 16px 20px; }
  .workspace-caption strong { font-size: 1.125rem; }
  .workspace-caption p { font-size: 1rem; }
  .view-details { padding: 16px 20px 18px; gap: 14px; grid-template-columns: 1fr; }
  .principles { font-size: .8125rem; gap: 10px; }
  .workflow-section, .discovery-section, .files-section, .scenarios-section { padding-block: 72px; }
  .section-heading { margin-bottom: 36px; }
  .workflow-steps { gap: 28px; margin-top: 36px; }
  .workflow-steps h3 { margin-top: 0; }
  .paper-diagram { padding: 24px 20px; }
  .diagram-heading { font-size: .6875rem; }
  .scenario-tabs { gap: 24px; }
  .scenario-tabs button { font-size: .9375rem; padding-block: 12px; }
  .scenario-text li { font-size: .9375rem; }
  .capabilities-section, .resources-section { padding-top: 72px; }
  .capability-grid { grid-template-columns: 1fr; gap: 20px; }
  .capability-card, .capability-wide { padding: 28px; border-radius: 18px; }
  .capability-wide { grid-template-columns: 1fr; gap: 28px; }
  .ownership-section, .faq-section { padding-block: 72px; }
  .ownership-grid { grid-template-columns: 1fr; gap: 32px; }
  #main .ownership-grid h2, #main .faq-intro h2, #main .origin-copy h2 { font-size: 1.875rem; }
  .resource-grid > a { padding: 28px; }
  .origin-section { gap: 40px; padding-block: 64px; }
  .start-section { padding-block: 72px; }
  html[lang='zh-CN'] #main > .start-section h2 { font-size: clamp(1.5rem, 7.2vw, 1.875rem); }
  .download-layout { margin-top: 36px; }
  .download-layout h3 { margin-top: 16px; }
  .site-footer { padding-inline: 8px; }
}
@media (max-width: 380px) {
  .nav-wrap { padding-inline: 12px; }
  .site-header .brand { font-size: 1rem; }
  .site-header .button { font-size: .75rem; padding-inline: 10px; }
  .hero-actions .button { min-width: 240px; }
  .diagram-heading { display: block; }
  .diagram-key { margin-top: 8px; }
  .file-list { margin-left: 4px; padding-left: 12px; }
  .file-list > div::before { width: 13px; left: -13px; }
}

/* Long AI Access screenshot: readable width with a pinned close control. */
#lightbox.long-image { width: min(860px, 96vw); padding: 0 12px 12px; overflow-y: auto; overscroll-behavior: contain; }
#lightbox.long-image #close-lightbox { position: sticky; top: 0; z-index: 1; display: block; margin-left: auto; background: #f6f8fc; border-radius: 0 0 8px 8px; }
#lightbox.long-image img { width: 100%; height: auto; max-height: none; object-fit: contain; }
@media (max-width: 720px) { #lightbox.long-image { padding-inline: 6px; padding-bottom: 6px; } }

/* Font-independent play mark: its visual center sits at the circle center. */
.video-play .play-circle {
  position: relative; padding: 0; flex: none; line-height: 1;
  background: transparent; transform: none; transition: none;
}
/* Animate only the blue disc; the SVG stays on a fixed, unscaled layer. */
.video-play .play-circle::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit;
  background: #4553c5; pointer-events: none; transform: scale(1);
  transition: transform .2s;
}
.video-play:hover .play-circle { transform: none; }
.video-play:hover .play-circle::before { transform: scale(1.07); }
.video-play .play-circle svg {
  position: relative; display: block; width: 28px; height: 28px;
  pointer-events: none;
}
@media (max-width: 720px) {
  .video-play .play-circle svg { width: 18px; height: 18px; }
}