:root {
  --page: #f5fbff;
  --soft-blue: #e9f5fc;
  --blue: #2e6489;
  --blue-deep: #173c59;
  --ink: #18334b;
  --muted: #526e83;
  --line: #d5e5f0;
  --white: #ffffff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--page); color: var(--ink); font: 1rem/1.6 Arial, "PingFang SC", "Microsoft YaHei", sans-serif; }
img { max-width: 100%; }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 3px solid #268ac4; outline-offset: 4px; border-radius: 4px; }
section[id], footer[id], div[id] { scroll-margin-top: 90px; }

.section-shell { width: min(100%, 1600px); margin-inline: auto; padding: clamp(64px, 7vw, 112px) clamp(20px, 5vw, 80px); }
.eyebrow, .section-index { margin: 0; color: #507c99; font-size: .78rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
.site-header { height: 76px; position: sticky; top: 0; z-index: 20; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 20px; padding-inline: clamp(20px, 5vw, 80px); border-bottom: 1px solid var(--line); background: rgba(245, 251, 255, .88); backdrop-filter: blur(18px); }
.brand { display: inline-flex; align-items: center; gap: 11px; width: fit-content; font-weight: 700; font-size: 1rem; }
.brand-mark { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px; background: #dceffc; color: var(--blue); font-size: .88rem; }
.main-nav { display: flex; align-items: center; gap: clamp(20px, 3vw, 46px); color: var(--muted); font-size: .88rem; }
.main-nav a:hover, .header-cta:hover, .text-link:hover { color: #167cb8; }
.header-cta { justify-self: end; display: inline-flex; align-items: center; gap: 8px; font-size: .88rem; font-weight: 700; color: var(--blue); }

.hero { min-height: min(660px, calc(100vh - 76px)); display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: clamp(36px, 5vw, 84px); }
.hero-copy { max-width: 690px; }
.hero h1 { margin: 24px 0 26px; font-size: clamp(4rem, 7vw, 7rem); font-weight: 750; line-height: 1.08; letter-spacing: -.02em; }
.hero h1 span { display: block; margin-top: 12px; font-size: clamp(2.2rem, 4vw, 4.1rem); font-weight: 650; color: var(--blue); letter-spacing: -.02em; }
.hero-intro { margin: 0; max-width: 610px; color: var(--muted); font-size: clamp(1rem, 1.35vw, 1.2rem); line-height: 1.8; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 27px; margin-top: 34px; }
.button { min-height: 52px; display: inline-flex; align-items: center; gap: 24px; padding: 0 22px; border-radius: 100px; font-size: .9rem; font-weight: 700; transition: background .2s ease, transform .2s ease; }
.button-primary { background: var(--blue); color: var(--white); }
.button-primary:hover { background: var(--blue-deep); transform: translateY(-2px); }
.text-link { display: inline-flex; align-items: center; gap: 8px; padding-bottom: 3px; border-bottom: 1px solid #8ba9bd; color: var(--blue); font-size: .9rem; }
.capabilities { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 54px; }
.capabilities span, .case-badges span, .skill-tags span { padding: 7px 12px; border: 1px solid var(--line); border-radius: 100px; background: var(--white); color: #4c718a; font-size: .82rem; }
.hero-visual { position: relative; aspect-ratio: 4 / 3; min-height: 440px; overflow: hidden; border: 1px solid #cfe3f0; border-radius: 28px; background: #dceffc; box-shadow: 0 25px 70px rgba(46, 100, 137, .12); }
.hero-visual img { width: 100%; height: 100%; display: block; object-fit: cover; object-position: 52% 50%; }
.visual-label { position: absolute; inset: 25px 28px auto; display: flex; justify-content: space-between; gap: 14px; color: var(--blue-deep); font-size: .7rem; font-weight: 700; letter-spacing: .12em; }

.impact { display: grid; grid-template-columns: .22fr .78fr; gap: 32px; align-items: start; padding-top: 0; }
.impact-heading h2 { margin: 13px 0 0; font-size: 1.5rem; letter-spacing: -.04em; }
.impact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.impact-item { min-width: 0; padding: 19px 24px 22px; border-left: 1px solid var(--line); }
.impact-item:first-child { border-left: 0; }
.impact-item strong { display: block; white-space: nowrap; color: var(--blue); font-size: clamp(1.6rem, 2.4vw, 2.5rem); line-height: 1.15; letter-spacing: -.05em; }
.impact-item strong span { margin-left: 2px; font-size: .48em; letter-spacing: 0; }
.impact-item p { margin: 8px 0 0; color: var(--muted); font-size: .9rem; line-height: 1.6; }

.work-section { background: var(--white); border: 1px solid #e7eff5; border-radius: 36px; box-shadow: 0 20px 80px rgba(56,104,137,.06); }
.section-heading { display: grid; grid-template-columns: 1fr minmax(250px, 410px); gap: 50px; align-items: end; margin-bottom: 50px; }
.section-heading h2, .about-intro h2 { margin: 10px 0 0; color: var(--blue-deep); font-size: clamp(2.6rem, 5vw, 5rem); line-height: 1.1; letter-spacing: -.02em; }
.section-heading > p { margin: 0 0 4px; color: var(--muted); font-size: .97rem; }
.case-feature { display: grid; grid-template-columns: 1.2fr .8fr; overflow: hidden; border: 1px solid #cde3f0; border-radius: 24px; background: #eef8fe; }
.case-feature-intro { padding: clamp(28px, 4vw, 55px); }
.case-category { margin: 0; color: #5d829b; font-size: .78rem; font-weight: 700; letter-spacing: .07em; }
.case-feature h3 { margin: 15px 0 19px; color: var(--blue-deep); font-size: clamp(2.4rem, 4vw, 4.2rem); line-height: 1.1; letter-spacing: -.02em; }
.case-feature-intro > p:nth-of-type(2) { max-width: 560px; margin: 0; color: var(--muted); line-height: 1.8; }
.case-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 34px; }
.case-feature-stats { display: flex; flex-direction: column; justify-content: center; padding: clamp(30px, 4vw, 54px); background: #dceffc; }
.case-feature-stats p { margin: 0 0 4px; color: #567b95; font-size: .85rem; }
.case-feature-stats strong { color: var(--blue); font-size: clamp(2.3rem, 4vw, 4.5rem); line-height: 1.18; letter-spacing: -.07em; white-space: nowrap; }
.case-feature-stats strong:last-child { font-size: clamp(2rem, 3.2vw, 3.4rem); }
.stat-divider { height: 1px; margin: 24px 0; background: #bbd7e8; }
.work-subheading { display: grid; grid-template-columns: 1fr minmax(250px, 410px); gap: 50px; align-items: end; margin: 76px 0 25px; }
.work-subheading h3, .work-subheading h4, .additional-title h3 { margin: 9px 0 0; color: var(--blue-deep); font-size: clamp(1.9rem, 3vw, 3rem); line-height: 1.2; letter-spacing: -.02em; }
.work-subheading > p { margin: 0; color: var(--muted); font-size: .93rem; }
.headline-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.headline-card, .category-card { display: flex; flex-direction: column; border: 1px solid #d7e8f2; border-radius: 20px; background: #f6fbff; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
.headline-card:hover, .category-card:hover { transform: translateY(-3px); border-color: #9ccbe5; box-shadow: 0 15px 35px rgba(46,100,137,.08); }
.headline-card { min-height: 270px; justify-content: space-between; padding: clamp(25px, 3vw, 38px); }
.headline-meta { display: flex; justify-content: space-between; gap: 14px; color: #67869b; font-size: .78rem; }
.headline-card h4 { margin: 32px 0; max-width: 520px; color: var(--blue-deep); font-size: clamp(1.4rem, 2.15vw, 2.15rem); line-height: 1.35; letter-spacing: -.01em; }
.headline-bottom { display: flex; align-items: end; justify-content: space-between; gap: 10px; border-top: 1px solid var(--line); padding-top: 18px; }
.headline-bottom span { color: var(--blue); font-size: .9rem; font-weight: 700; }
.headline-bottom strong { color: var(--blue); font-size: 1.7rem; line-height: 1; white-space: nowrap; }
.headline-bottom small { margin-left: 5px; color: var(--muted); font-size: .76rem; font-weight: 400; }
.category-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.category-card { min-height: 285px; padding: 27px; background: #fff; }
.category-card-top { display: flex; justify-content: space-between; gap: 14px; color: #67869b; font-size: .78rem; }
.category-card-top span:first-child { color: var(--blue); font-weight: 700; }
.category-card h4 { margin: 26px 0 11px; color: var(--blue-deep); font-size: clamp(1.2rem, 1.55vw, 1.5rem); line-height: 1.4; }
.category-card p { margin: 0 0 24px; color: var(--muted); font-size: .9rem; line-height: 1.65; }
.category-card-foot { display: flex; justify-content: space-between; align-items: end; flex-wrap: wrap; gap: 8px 14px; margin-top: auto; padding-top: 15px; border-top: 1px solid var(--line); color: var(--muted); font-size: .83rem; }
.category-card-foot span:last-child { color: var(--blue); font-size: .9rem; font-weight: 700; white-space: nowrap; }
.special-list { border-top: 1px solid var(--line); }
.special-row { display: grid; grid-template-columns: minmax(150px, .3fr) minmax(0, 1fr) 140px 18px; gap: 18px; align-items: center; min-height: 78px; padding: 15px 20px; border-bottom: 1px solid var(--line); }
.special-row:hover { color: #167cb8; background: #f6fbff; }
.special-row-context { background: #f6fbff; }
.special-row > span:first-child { color: #67869b; font-size: .85rem; }
.special-row strong { font-size: 1rem; font-weight: 600; line-height: 1.5; }
.special-row > span:nth-of-type(2) { color: var(--blue); font-size: .9rem; white-space: nowrap; }
.special-row > span:last-child { justify-self: end; }
.miyou-section { margin-top: clamp(90px, 9vw, 140px); padding-top: clamp(70px, 7vw, 105px); border-top: 1px solid var(--line); }
.miyou-intro { display: grid; grid-template-columns: 1fr minmax(250px, 410px); gap: 50px; align-items: end; margin-bottom: 35px; }
.miyou-intro h3 { margin: 9px 0 0; color: var(--blue-deep); font-size: clamp(2.4rem, 4vw, 4rem); line-height: 1.12; }
.miyou-intro > p { margin: 0; color: var(--muted); font-size: .97rem; }
.social-feature-heading { display: grid; grid-template-columns: 1fr minmax(250px, 410px); gap: 12px 50px; align-items: end; margin: 50px 0 25px; }
.social-feature-heading .section-index { grid-column: 1 / -1; }
.social-feature-heading h4 { margin: 0; color: var(--blue-deep); font-size: clamp(1.9rem, 3vw, 3rem); line-height: 1.2; }
.social-feature-heading > p:last-child { margin: 0; color: var(--muted); font-size: .93rem; }
.social-feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.social-feature-card { min-height: 270px; display: flex; flex-direction: column; padding: clamp(25px, 3vw, 36px); border: 1px solid #d7e8f2; border-radius: 20px; background: #f7fbff; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
.social-feature-card:first-child { background: #eaf6fd; border-color: #b7d9eb; }
.social-feature-card:hover { transform: translateY(-3px); border-color: #9ccbe5; box-shadow: 0 15px 35px rgba(46,100,137,.08); }
.social-feature-meta { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 4px 14px; color: #67869b; font-size: .82rem; }
.social-feature-meta span:first-child { color: var(--blue); font-weight: 700; }
.social-feature-card h5 { margin: 25px 0 12px; color: var(--blue-deep); font-size: clamp(1.3rem, 2vw, 1.8rem); font-weight: 650; line-height: 1.35; }
.social-feature-card > p { margin: 0 0 24px; color: var(--muted); font-size: .93rem; line-height: 1.7; }
.social-feature-link { margin-top: auto; padding-top: 15px; border-top: 1px solid var(--line); color: var(--blue); font-size: .9rem; font-weight: 700; }
.topic-heading { margin-top: 75px; }
.topic-heading-secondary { margin-top: 42px; }
.topic-list { margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.topic-list a, .topic-list-entry { display: grid; grid-template-columns: 130px minmax(0, 1fr) 18px; gap: 18px; align-items: center; min-height: 74px; padding: 14px 4px; border-bottom: 1px solid var(--line); }
.topic-list a:hover { color: #167cb8; }
.topic-list a > span:first-child, .topic-list-entry > span:first-child { color: #64849a; font-size: .88rem; }
.topic-list a > span:first-child small, .topic-list-entry > span:first-child small { display: block; margin-top: 4px; font-size: .8rem; }
.topic-list strong { font-size: 1rem; font-weight: 600; line-height: 1.5; }
.topic-list a > span:last-child { justify-self: end; color: var(--blue); }
.additional-work { display: grid; grid-template-columns: .3fr .7fr; gap: 44px; margin-top: 88px; }
.additional-list { border-top: 1px solid var(--line); }
.additional-list a { display: grid; grid-template-columns: 100px minmax(0, 1fr) minmax(120px, .65fr) 18px; gap: 16px; align-items: center; min-height: 86px; padding: 17px 0; border-bottom: 1px solid var(--line); transition: color .2s ease; }
.additional-list a:hover { color: #167cb8; }
.additional-list a > span:first-child { color: #64849a; font-size: .8rem; }
.additional-list strong { font-size: .98rem; font-weight: 600; line-height: 1.45; }
.additional-list small { color: var(--muted); font-size: .76rem; line-height: 1.5; }
.additional-list a > span:last-child { grid-column: 4; justify-self: end; color: var(--blue); }

.experience-section { padding-top: clamp(90px, 9vw, 145px); }
.timeline { border-top: 1px solid var(--line); }
.timeline-row { display: grid; grid-template-columns: 165px minmax(0, 1fr) 40px; gap: clamp(20px, 4vw, 65px); align-items: start; padding: 34px 0; border-bottom: 1px solid var(--line); }
.timeline-date, .timeline-index { color: #64859b; font-size: .82rem; }
.timeline-index { justify-self: end; }
.timeline-row h3 { margin: -3px 0 5px; color: var(--blue-deep); font-size: clamp(1.22rem, 1.9vw, 1.85rem); letter-spacing: -.015em; }
.timeline-row div > p { margin: 0; color: var(--muted); font-size: .92rem; line-height: 1.7; }
.timeline-row div > p:nth-of-type(1) { margin-bottom: 12px; color: #3a6e91; font-size: .85rem; font-weight: 700; }

.about-section { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(45px, 8vw, 130px); margin-bottom: 60px; border: 1px solid #d6e8f2; border-radius: 36px; background: #eaf6fd; }
.about-intro > p:last-child { margin: 28px 0 0; max-width: 570px; color: var(--muted); font-size: 1rem; line-height: 1.85; }
.about-details { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.detail-block { padding-top: 14px; border-top: 1px solid #bdd9e9; }
.detail-block h3 { margin: 0 0 26px; color: var(--blue-deep); font-size: 1.1rem; }
.detail-block p { margin: 0 0 5px; color: var(--muted); font-size: .92rem; line-height: 1.6; }
.detail-block p strong { color: var(--ink); }
.detail-block > span { display: block; margin-bottom: 27px; color: #66859b; font-size: .78rem; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.skill-tags span { font-size: .78rem; }

.site-footer { padding: clamp(66px, 7vw, 110px) clamp(20px, 5vw, 80px) 28px; background: var(--blue-deep); color: #fff; }
.site-footer > div:first-child { max-width: 1500px; margin-inline: auto; }
.site-footer .section-index { color: #b5d8ed; }
.site-footer h2 { margin: 17px 0 28px; max-width: 900px; font-size: clamp(2.5rem, 5vw, 5.4rem); line-height: 1.15; letter-spacing: -.02em; }
.footer-mail { display: inline-flex; gap: 14px; padding-bottom: 4px; border-bottom: 1px solid #b3d7e9; color: #d5edfb; font-size: clamp(1.2rem, 2.2vw, 2rem); }
.footer-mail:hover { color: #fff; }
.footer-bottom { max-width: 1500px; display: grid; grid-template-columns: 1fr auto 1fr; gap: 20px; margin: clamp(100px, 10vw, 160px) auto 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.3); color: #aecfe2; font-size: .78rem; }
.footer-bottom a { justify-self: end; color: #fff; }

@media (max-width: 1000px) {
  .hero { min-height: auto; grid-template-columns: 1fr; }
  .hero-copy { max-width: 800px; }
  .hero-visual { min-height: 480px; aspect-ratio: 16 / 9; }
  .impact { grid-template-columns: 1fr; }
  .impact-grid { grid-template-columns: repeat(2, 1fr); }
  .impact-item:nth-child(3) { border-left: 0; }
  .impact-item:nth-child(n+3) { border-top: 1px solid var(--line); }
  .category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about-section { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .site-header { grid-template-columns: 1fr auto; grid-template-rows: auto auto; height: auto; gap: 2px 12px; padding-block: 9px 5px; }
  .main-nav { grid-column: 1 / -1; grid-row: 2; display: flex; gap: 24px; overflow-x: auto; white-space: nowrap; scrollbar-width: none; font-size: .88rem; }
  .main-nav::-webkit-scrollbar { display: none; }
  .main-nav a { display: inline-flex; align-items: center; min-height: 40px; }
  section[id], footer[id], div[id] { scroll-margin-top: 112px; }
  .section-shell { padding-top: 62px; padding-bottom: 62px; }
  .hero { gap: 28px; padding-top: 42px; padding-bottom: 42px; }
  .hero h1 { margin: 17px 0 18px; font-size: clamp(3.2rem, 13vw, 5.6rem); }
  .hero h1 span { font-size: clamp(1.9rem, 6.5vw, 3.2rem); }
  .hero-actions { margin-top: 24px; }
  .capabilities { margin-top: 27px; }
  .hero-visual { min-height: 0; aspect-ratio: 16 / 10; border-radius: 20px; }
  .visual-label { inset-block-start: 17px; }
  .work-section { border-radius: 24px; }
  .section-heading, .work-subheading, .miyou-intro, .social-feature-heading, .additional-work { grid-template-columns: 1fr; gap: 16px; }
  .social-feature-heading .section-index { grid-column: 1; }
  .case-feature { grid-template-columns: 1fr; }
  .headline-grid, .category-grid, .social-feature-grid, .about-details { grid-template-columns: 1fr; }
  .headline-card, .category-card, .social-feature-card { min-height: 0; padding: 23px; }
  .headline-card h4 { margin: 22px 0; }
  .category-card h4, .social-feature-card h5 { margin-top: 18px; }
  .miyou-section { margin-top: 80px; padding-top: 65px; }
  .special-row { grid-template-columns: minmax(0, 1fr) 18px; gap: 5px 12px; }
  .special-row > span:first-child { grid-column: 1; }
  .special-row strong { grid-column: 1 / -1; grid-row: 2; }
  .special-row > span:nth-of-type(2) { grid-column: 1; grid-row: 3; }
  .special-row > span:last-child { grid-column: 2; grid-row: 1; }
  .topic-list a, .topic-list-entry { grid-template-columns: 100px minmax(0, 1fr) 18px; gap: 10px; }
  .additional-list a { grid-template-columns: 80px 1fr 18px; }
  .additional-list a small { grid-column: 2; }
  .additional-list a > span:last-child { grid-column: 3; grid-row: 1; }
  .timeline-row { grid-template-columns: 1fr 25px; gap: 8px 20px; }
  .timeline-date { grid-column: 1; }
  .timeline-row > div { grid-column: 1 / -1; grid-row: 2; }
  .timeline-index { grid-column: 2; grid-row: 1; }
  .footer-bottom { grid-template-columns: 1fr; margin-top: 90px; }
  .footer-bottom a { justify-self: start; }
}
@media (max-width: 420px) {
  .header-cta { font-size: .8rem; }
  .main-nav { gap: 20px; }
  .section-shell { padding-inline: 18px; }
  .hero { padding-top: 35px; padding-bottom: 34px; }
  .hero h1 { font-size: clamp(2.9rem, 12vw, 3.8rem); }
  .hero h1 span { font-size: clamp(1.72rem, 6.4vw, 2.2rem); }
  .hero-actions { gap: 18px; }
  .impact-item { padding-inline: 14px; }
  .impact-item strong { font-size: 1.42rem; }
  .headline-card h4 { font-size: 1.35rem; }
  .headline-bottom strong { font-size: 1.36rem; }
  .category-card p, .social-feature-card > p { margin-bottom: 16px; }
  .topic-list a, .topic-list-entry { grid-template-columns: minmax(0, 1fr) 18px; gap: 5px 12px; }
  .topic-list a > span:first-child, .topic-list-entry > span:first-child { grid-column: 1; grid-row: 1; }
  .topic-list strong { grid-column: 1; grid-row: 2; }
  .topic-list a > span:last-child { grid-column: 2; grid-row: 2; }
  .visual-label { inset-inline: 17px; font-size: .62rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}