* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; background: var(--surface-base); color: var(--text-primary); font-family: var(--font-japanese); font-size: 16px; font-weight: 400; line-height: 1.85; letter-spacing: 0; -webkit-font-smoothing: antialiased; }
h1, h2, h3, .lead, .closing p { font-feature-settings: "palt"; text-wrap: pretty; word-break: normal; overflow-wrap: anywhere; }
.brand, .eyebrow, .diagram-overline, .ai-node, .section-marker, footer > span { font-family: var(--font-latin); }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; }
a { -webkit-tap-highlight-color: transparent; }
::selection { background: var(--accent-subtle); color: var(--text-primary); }
p, h1, h2, h3, figure { margin: 0; }
.skip-link { position: fixed; top: -100px; left: 20px; padding: 14px; background: var(--surface-raised); z-index: 20; }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 10; background: var(--surface-base); max-width: 1200px; margin: auto; min-height: 64px; padding: 12px 36px; display: flex; align-items: center; gap: 40px; border-bottom: 1px solid var(--border-subtle); }
.site-header .brand { line-height: 1; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-size: 24px; letter-spacing: -.9px; font-weight: 600; flex-shrink: 0; }
.brand-symbol { font-size: 31px; font-weight: 400; transform: translateY(-2px); }
nav { display: flex; gap: 30px; margin-left: auto; }
nav a, .header-link { font-size: 14px; color: var(--text-secondary); transition: color .2s; }
nav a:hover, .text-link:hover { color: var(--text-primary); }
.header-link { display: inline-flex; align-items: center; justify-content: center; min-height: 32px; color: var(--button-text); padding: 6px 14px; background: var(--button-background); border: 0; border-radius: 999px; font-size: 12px; line-height: 1.5; font-weight: 600; transition: background .2s; }
.header-link:hover { background: color-mix(in srgb, var(--button-background) 90%, var(--button-text)); }
.header-link span { margin-left: 10px; }
.hero { max-width: 1200px; padding: 140px 36px 0; margin: auto; text-align: left; overflow: hidden; }
.eyebrow { font-size: 13px; letter-spacing: .6px; color: var(--text-secondary); line-height: 1.6; }
.hero .eyebrow { display: flex; align-items: center; justify-content: center; gap: 9px; }
.status-dot { width: 5px; height: 5px; background: var(--accent); border-radius: 50%; box-shadow: 0 0 9px var(--accent); }
h1 { font-size: clamp(40px, 4.5vw, 60px); font-weight: 500; line-height: 1.35; letter-spacing: 0; margin: 0 0 32px; }
h1 span { color: var(--text-primary); }
.hero-bottom { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.hero-bottom .text-link { white-space: nowrap; }
.hero-description { color: var(--text-secondary); font-size: 16px; line-height: 1.85; letter-spacing: 0; }
.button { display: inline-flex; align-items: center; gap: 32px; margin-top: 30px; padding: 13px 18px; background: var(--button-background); color: var(--button-text); font-size: 14px; font-weight: 550; border-radius: 7px; box-shadow: 0 0 24px color-mix(in srgb, var(--text-primary) 6%, transparent); transition: transform .2s; }
.button:hover { transform: translateY(-2px); }
.relationship { margin: 44px auto 0; max-width: 1128px; padding: 20px 0 0; border-top: 1px solid var(--border-subtle); }
.diagram-overline { display: flex; justify-content: space-between; color: var(--text-tertiary); font-size: 12px; letter-spacing: .7px; }
.diagram-stage { position: relative; height: 340px; }
.flow-lines { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.flow-tracks { fill: none; stroke: url(#line-light); stroke-width: 1; }
.line-start, .line-end { stop-color: var(--text-primary); stop-opacity: .08; }
.line-center { stop-color: var(--text-primary); stop-opacity: .55; }
.flow-pulses { fill: none; stroke: var(--text-primary); stroke-width: 1; stroke-dasharray: 40 1150; stroke-dashoffset: 1190; opacity: .65; animation: flow 16s linear infinite; }
.flow-pulses path:nth-child(2) { stroke-dasharray: 25 1165; }
.ai-node { position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%); width: 80px; height: 80px; display: grid; place-items: center; border: 1px solid color-mix(in srgb, var(--text-primary) 30%, transparent); border-radius: 16px; background: var(--surface-base); color: var(--text-primary); font-size: 23px; font-weight: 400; letter-spacing: -.02em; }
.diagram-label { position: absolute; z-index: 1; display: flex; align-items: center; gap: 10px; background: var(--surface-base); color: var(--text-secondary); padding: 10px 14px; font-size: 13px; }
.label-left { left: 5%; }.label-right { right: 5%; }.label-one { top: 26.5625%; transform: translateY(-50%); }.label-two { top: 73.4375%; transform: translateY(-50%); }
figcaption { color: var(--text-secondary); font-size: 13px; line-height: 1.9; padding-top: 6px; text-align: center; }
figcaption span { color: var(--text-tertiary); margin-left: 8px; }
.section-marker { display: flex; justify-content: space-between; text-align: left; margin-top: 45px; padding: 22px 0; border-bottom: 1px solid var(--border-subtle); color: var(--text-tertiary); font-size: 12px; letter-spacing: .3px; }
.section-wrap { max-width: 1128px; width: calc(100% - 72px); margin: auto; }
.support { padding: 105px 0 96px; display: grid; grid-template-columns: 1fr 1fr; column-gap: 68px; }
h2 { font-size: clamp(30px, 3vw, 40px); line-height: 1.5; font-weight: 500; letter-spacing: 0; margin-top: 22px; }
h2 span { color: var(--text-secondary); }
.support-copy { padding-top: 40px; }
.lead { font-size: 22px; font-weight: 500; line-height: 1.65; letter-spacing: 0; }
.support-copy > p:not(.lead) { font-size: 15px; line-height: 1.95; color: var(--text-secondary); margin-top: 23px; }
.text-link { display: inline-flex; align-items: center; gap: 20px; font-size: 14px; color: var(--text-secondary); line-height: 1.8; }
.support-copy .text-link { margin-top: 28px; color: var(--text-primary); }
.principles { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 0; grid-column: 1 / -1; margin-top: 76px; padding-top: 33px; border-top: 1px solid var(--border-subtle); }
.principles article { display: flex; flex-direction: column; padding: 0 32px; border-left: 1px solid var(--border-subtle); }
.principles article:first-child { padding-left: 0; border-left: 0; }.principles article:last-child { padding-right: 0; }
.step-number { color: var(--text-tertiary); font-family: ui-monospace, monospace; font-size: 13px; }
h3 { font-size: 18px; font-weight: 500; letter-spacing: 0; line-height: 1.6; }
.principles h3 { margin: 24px 0 12px; }
.principles p { flex: 1; color: var(--text-secondary); font-size: 15px; line-height: 1.9; }
.step-label { display: block; color: var(--text-tertiary); font-size: 12px; margin-top: 23px; }
.use-cases { border-top: 1px solid var(--border-subtle); padding: 96px 0; display: grid; grid-template-columns: 1fr 1.15fr; gap: 68px; }
.use-cases-intro > p:last-child { color: var(--text-secondary); font-size: 15px; line-height: 1.9; margin-top: 25px; }
.case-list article { display: flex; gap: 20px; padding: 27px 0; border-bottom: 1px solid var(--border-subtle); }.case-list article:first-child { padding-top: 0; }.case-list article:last-child { border-bottom: 0; padding-bottom: 0; }
.case-icon { width: 38px; height: 38px; flex-shrink: 0; display: grid; place-items: center; font-size: 22px; color: var(--text-secondary); background: var(--surface-raised); border: 1px solid var(--border-subtle); border-radius: 8px; }
.case-list p { color: var(--text-secondary); font-size: 14px; line-height: 1.9; margin-top: 8px; }
.closing { border-top: 1px solid var(--border-subtle); text-align: center; padding: 75px 0 84px; }
.closing-mark { font-size: 36px; color: var(--accent); }.closing p { font-size: 32px; font-weight: 500; letter-spacing: 0; margin: 20px 0; line-height: 1.5; }
.mobile-break { display: none; }
footer { display: flex; align-items: center; gap: 25px; padding: 25px 0 35px; border-top: 1px solid var(--border-subtle); }footer p, footer > span { font-size: 12px; color: var(--text-tertiary); }footer > span { margin-left: auto; }footer .brand { font-size: 20px; }footer .brand-symbol { font-size: 26px; }
@keyframes flow { to { stroke-dashoffset: 0; } }
@media (min-width: 1450px) { .hero { padding-top: 165px; } }
@media (max-width: 800px) {
  .site-header { padding-inline: 24px; gap: 20px; }nav { gap: 18px; }.header-link { margin-left: auto; }
  .hero { padding: 64px 24px 0; }.relationship { margin-top: 32px; }.diagram-stage { height: 220px; }.label-left { left: 0; }.label-right { right: 0; }
  .hero-bottom { align-items: flex-start; }.hero-description { max-width: 420px; }
  .section-wrap { width: calc(100% - 48px); }.support, .use-cases { gap: 35px; padding-block: 70px; }.support-copy { padding-top: 35px; }.lead { font-size: 20px; }.desktop-break { display: none; }
  .principles { margin-top: 22px; }.principles article { padding-inline: 20px; }.principles h3 { font-size: 16px; }.case-list p br { display: none; }
}
@media (max-width: 600px) {
  .site-header { min-height: 60px; padding: 10px 20px; }.brand { font-size: 22px; }nav { display: none; }.header-link { padding: 6px 12px; }.header-link span { margin-left: 6px; }
  .hero { padding: 56px 20px 0; }.hero .eyebrow { font-size: 12px; letter-spacing: .2px; }h1 { font-size: clamp(32px, 7.8vw, 44px); margin-block: 27px 22px; line-height: 1.4; }.hero-description { font-size: 15px; }.button { margin-top: 26px; font-size: 13px; }
  .hero-bottom { display: block; }.hero-bottom .text-link { margin-top: 20px; }.diagram-overline span:last-child { display: none; }
  .relationship { margin-top: 32px; }.diagram-overline { padding: 0; font-size: 12px; }.diagram-stage { height: 200px; }.ai-node { width: 66px; height: 66px; border-radius: 18px; font-size: 18px; gap: 5px; }
  .diagram-label { padding: 6px 8px; gap: 5px; font-size: 12px; }.label-right.label-two { max-width: 117px; text-align: left; }.label-left { left: 0; }.label-right { right: 0; }
  figcaption { padding-top: 0; font-size: 12px; }figcaption span { display: block; margin-left: 0; }.section-marker { margin-top: 24px; padding-block: 20px; font-size: 12px; }
  .section-wrap { width: calc(100% - 40px); }.support, .use-cases { grid-template-columns: 1fr; padding-block: 58px; gap: 30px; }h2 { font-size: 31px; margin-top: 17px; }.support-copy { padding-top: 0; }.support-copy > p:not(.lead) { font-size: 16px; }.lead { font-size: 22px; }
  .principles { grid-template-columns: 1fr; margin-top: 12px; padding-top: 0; }.principles article, .principles article:first-child, .principles article:last-child { padding: 27px 0; border-left: 0; border-bottom: 1px solid var(--border-subtle); }.principles article:last-child { padding-bottom: 0; border-bottom: 0; }.principles h3 { margin-top: 14px; font-size: 18px; }.principles p { font-size: 16px; }.step-label { margin-top: 16px; }
  .use-cases { gap: 38px; }.use-cases-intro > p:last-child { font-size: 16px; }.case-list { min-width: 0; }.case-list article { gap: 14px; }.case-list h3 { font-size: 17px; }.case-list p { font-size: 15px; }
  .closing { padding: 52px 0; }.closing p { font-size: 29px; }.mobile-break { display: block; }.closing .text-link { font-size: 13px; gap: 12px; }
  footer { flex-wrap: wrap; column-gap: 20px; row-gap: 16px; }footer p { flex: 1; text-align: right; }footer > span { margin: 0; width: 100%; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; }.flow-pulses { animation: none; }a { transition: none; }.button:hover { transform: none; } }