@charset "UTF-8";

:root {
  color-scheme: light;
  --paper: #f7f6f2;
  --paper-deep: #efeee8;
  --ink: #172b3a;
  --ink-soft: #425462;
  --blue: #587b91;
  --line: #d9dcd8;
  --white: #fffefa;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 6rem; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font); font-size: 16px; line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--blue); outline-offset: 5px; }
.page-shell { width: min(1120px, calc(100% - 64px)); margin-inline: auto; }
.site-header { width: min(1120px, calc(100% - 64px)); height: 78px; margin-inline: auto; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.wordmark { font-size: 20px; font-weight: 650; letter-spacing: -.055em; }
.wordmark-dot, .hero-separator { color: var(--blue); }
.site-nav { display: flex; gap: 34px; color: var(--ink-soft); font-size: 13px; }
.site-nav a, .back-link, .back-top { transition: color .18s ease; }
.site-nav a:hover, .back-link:hover, .back-top:hover { color: var(--blue); }
.hero { min-height: 620px; padding-top: 132px; padding-bottom: 60px; position: relative; }
.eyebrow, .section-kicker { color: var(--blue); font-size: 11px; letter-spacing: .13em; text-transform: uppercase; }
.eyebrow { display: flex; align-items: center; gap: 10px; margin: 0 0 25px; }
.eyebrow-mark { display: inline-block; width: 7px; height: 7px; background: var(--blue); border-radius: 50%; }
.hero h1, .case-intro h1 { max-width: 900px; margin: 0; font-size: clamp(40px, 6vw, 68px); line-height: 1.23; letter-spacing: -.055em; font-weight: 560; }
.hero-subject { font-weight: 420; }
.hero-copy { max-width: 550px; margin: 25px 0 0; color: var(--ink-soft); font-size: 17px; }
.hero-actions { display: flex; gap: 12px; margin-top: 35px; }
.button { display: inline-flex; align-items: center; gap: 18px; min-height: 46px; padding: 0 18px; border: 1px solid var(--ink); font-size: 13px; }
.button-primary { background: var(--ink); color: var(--white); }
.button-primary:hover { background: #263f50; }
.button-secondary { border-color: var(--line); }
.button-secondary:hover { border-color: var(--blue); color: var(--blue); }
.hero-index { position: absolute; right: 0; bottom: 47px; display: flex; align-items: center; gap: 12px; color: var(--blue); font-size: 11px; letter-spacing: .12em; }
.hero-index span { width: 75px; height: 1px; background: var(--line); }
.section { padding-top: 104px; padding-bottom: 104px; border-top: 1px solid var(--line); display: grid; grid-template-columns: 1fr 1.25fr; gap: 80px; }
.section-kicker { display: flex; justify-content: space-between; max-width: 190px; margin: 0 0 24px; }
.section-kicker span { color: #929d9f; }
.section-heading h2 { margin: 0; font-size: clamp(30px, 4vw, 44px); line-height: 1.32; letter-spacing: -.045em; font-weight: 520; }
.about-content { padding-top: 5px; }
.focus-item { display: grid; grid-template-columns: 40px 1fr; gap: 10px; padding: 0 0 25px; border-bottom: 1px solid var(--line); }
.focus-item + .focus-item { padding-top: 23px; }
.focus-number { padding-top: 3px; color: var(--blue); font-size: 11px; }
.focus-item h3 { margin: 0 0 5px; font-size: 18px; font-weight: 530; }
.focus-item p, .about-note { margin: 0; color: var(--ink-soft); font-size: 14px; }
.about-note { max-width: 600px; margin-top: 25px; line-height: 1.9; }
.work-section { background: var(--paper-deep); border-top: 1px solid var(--line); }
.work-layout { padding-top: 94px; padding-bottom: 94px; display: grid; grid-template-columns: 1fr 1.25fr 145px; gap: 56px; align-items: start; }
.work-content { padding-top: 48px; }
.work-description { max-width: 540px; margin: 0; color: var(--ink-soft); font-size: 15px; line-height: 1.9; }
.steps { margin: 29px 0 24px; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); list-style: none; border-top: 1px solid #cfd4d2; border-left: 1px solid #cfd4d2; }
.steps li { min-height: 48px; display: flex; align-items: center; padding: 7px 10px; border-right: 1px solid #cfd4d2; border-bottom: 1px solid #cfd4d2; color: var(--ink-soft); font-size: 12px; }
.text-link { display: inline-flex; align-items: center; gap: 18px; padding-bottom: 4px; border-bottom: 1px solid var(--blue); color: var(--ink); font-size: 13px; }
.text-link:hover { color: var(--blue); }
.work-aside { min-height: 200px; margin-top: 55px; border-left: 1px solid #cfd4d2; padding-left: 20px; display: flex; flex-direction: column; align-items: flex-start; }
.aside-label { color: var(--blue); font-size: 9px; letter-spacing: .14em; }
.aside-mark { margin-top: 10px; color: #aec0c8; font-size: 66px; font-weight: 300; line-height: 1.2; }
.aside-caption { color: var(--ink-soft); font-size: 11px; line-height: 1.6; }
.contact-section { padding-top: 94px; padding-bottom: 102px; }
.contact-content { padding-top: 3px; }
.contact-row { display: grid; grid-template-columns: 80px 1fr 20px; align-items: center; gap: 12px; min-height: 56px; border-bottom: 1px solid var(--line); font-size: 14px; }
.contact-row > span:first-child { color: #849096; font-size: 12px; }
.contact-row > span:last-child { color: var(--blue); }
.contact-row:hover { color: var(--blue); }
.site-footer { min-height: 84px; display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); color: #758188; font-size: 11px; }
.site-footer .wordmark { color: var(--ink); font-size: 17px; }
.site-footer p { margin: 0; }
.back-top { font-size: 11px; }

/* Case study */
.case-main { max-width: 920px; }
.back-link { display: inline-block; margin-top: 24px; color: var(--ink-soft); font-size: 12px; }
.case-intro { padding: 54px 0 40px; }
.case-intro .eyebrow { margin-bottom: 20px; }
.case-id { margin-left: 8px; color: #8c999e; font-size: 10px; }
.case-intro h1 { font-size: clamp(38px, 5.2vw, 58px); }
.case-principle { display: grid; grid-template-columns: 90px 1fr; gap: 12px; max-width: 620px; margin-top: 27px; padding-top: 16px; border-top: 1px solid var(--line); }
.case-principle span { color: var(--blue); font-size: 11px; }
.case-principle p { margin: 0; font-size: 14px; }
.case-lede { margin: 8px 0 0 102px; color: var(--ink-soft); font-size: 13px; }
.conversation, .case-steps, .case-breakdown { padding: 31px 0 34px; border-top: 1px solid var(--line); }
.case-section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 20px; }
.case-section-heading .section-kicker { max-width: 160px; margin-bottom: 6px; }
.case-section-heading h2 { margin: 0; font-size: 23px; font-weight: 520; letter-spacing: -.03em; }
.conversation-note { margin: 0 0 3px; color: #758188; font-size: 11px; line-height: 1.7; text-align: right; }
.chat-thread { display: grid; grid-template-columns: 1fr 1fr; column-gap: 11%; row-gap: 12px; }
.message { max-width: 100%; padding: 12px 15px 13px; background: var(--white); border: 1px solid #e5e5df; }
.message-client { grid-column: 1; }
.message-agent { grid-column: 2; background: #edf1f2; border-color: #dbe2e3; }
.message-role { display: flex; justify-content: space-between; gap: 20px; margin-bottom: 5px; color: var(--blue); font-size: 10px; }
.message-role span { color: #9aa5a8; }
.message p { margin: 0; color: var(--ink); font-size: 12px; line-height: 1.75; }
.case-steps { padding-bottom: 31px; }
.case-steps-list { grid-template-columns: repeat(6, 1fr); margin: 0; }
.case-steps-list li { min-height: 43px; justify-content: center; padding-inline: 6px; text-align: center; font-size: 11px; }
.case-breakdown { padding-bottom: 37px; }
.breakdown-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.breakdown-grid article { min-height: 88px; padding: 12px 14px; border: 1px solid var(--line); background: rgba(255, 254, 250, .5); }
.breakdown-grid article span { color: var(--blue); font-size: 10px; }
.breakdown-grid article p { margin: 6px 0 0; color: var(--ink-soft); font-size: 12px; line-height: 1.7; }
.case-bottom-nav { display: flex; justify-content: space-between; padding: 18px 0 36px; border-top: 1px solid var(--line); }

@media (max-width: 760px) {
  .page-shell, .site-header { width: min(100% - 40px, 540px); }
  .site-header { height: 66px; }
  .site-nav { gap: 18px; font-size: 12px; }
  .hero { min-height: 580px; padding-top: 120px; }
  .hero h1 { font-size: clamp(38px, 10vw, 56px); }
  .hero-copy { max-width: 440px; font-size: 15px; }
  .hero-index { bottom: 35px; }
  .section { grid-template-columns: 1fr; gap: 34px; padding-top: 70px; padding-bottom: 72px; }
  .section-heading h2 br { display: none; }
  .work-layout { grid-template-columns: 1fr; gap: 14px; padding-top: 70px; padding-bottom: 70px; }
  .work-content { padding-top: 5px; }
  .work-aside { display: none; }
  .contact-section { padding-top: 70px; padding-bottom: 75px; }
  .site-footer { min-height: 74px; flex-wrap: wrap; gap: 4px 12px; padding-block: 14px; }
  .site-footer p { order: 3; width: 100%; }
  .case-main { width: min(100% - 40px, 540px); }
  .case-intro { padding-top: 44px; padding-bottom: 30px; }
  .case-principle { grid-template-columns: 76px 1fr; }
  .case-lede { margin-left: 88px; }
  .chat-thread { grid-template-columns: 1fr; gap: 10px; }
  .message-client, .message-agent { grid-column: 1; }
  .message-agent { margin-left: 8%; }
  .case-steps-list { grid-template-columns: repeat(3, 1fr); }
  .breakdown-grid { grid-template-columns: 1fr; gap: 8px; }
  .breakdown-grid article { min-height: 0; }
}

@media (max-width: 420px) {
  .page-shell, .site-header, .case-main { width: calc(100% - 36px); }
  .site-nav { gap: 13px; }
  .hero { min-height: 550px; padding-top: 105px; }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .button { min-width: 190px; justify-content: space-between; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .case-main { width: calc(100% - 36px); }
  .case-section-heading { align-items: flex-start; flex-direction: column; gap: 9px; }
  .conversation-note { text-align: left; }
  .case-lede { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}