:root {
  --ink: #071e31;
  --ink-2: #0b2941;
  --blue: #0856d8;
  --cyan: #0bb9e9;
  --red: #e1252e;
  --gold: #d9b260;
  --paper: #f8f7f3;
  --mist: #edf2f5;
  --text: #122638;
  --muted: #647381;
  --line: rgba(14, 40, 61, .16);
  --line-dark: rgba(255, 255, 255, .15);
  --shell: min(91vw, 1440px);
  --sans: "Avenir Next", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
}

* { box-sizing: border-box; }
html { overflow-x: clip; scroll-behavior: smooth; background: var(--ink); }
body { overflow-x: clip; margin: 0; color: var(--text); background: var(--paper); font-family: var(--sans); font-size: 16px; line-height: 1.75; -webkit-font-smoothing: antialiased; }
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; overflow-wrap: anywhere; text-decoration: none; }
button { color: inherit; font: inherit; }
::selection { color: white; background: var(--blue); }
.shell { width: var(--shell); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }
.skip-link { position: fixed; top: -100%; left: 1rem; z-index: 1000; padding: .7rem 1rem; color: white; background: var(--red); }
.skip-link:focus { top: 1rem; }

.site-header { position: fixed; inset: 0 0 auto; z-index: 100; display: flex; align-items: center; justify-content: space-between; height: 88px; padding: 0 4.5vw; color: white; border-bottom: 1px solid rgba(255,255,255,.18); transition: height .3s ease, background .3s ease, backdrop-filter .3s ease; }
.site-header.is-scrolled { height: 72px; background: rgba(7, 30, 49, .94); backdrop-filter: blur(16px); }
.brand { display: flex; align-items: center; width: 118px; height: 64px; }
.brand img { width: 108px; height: auto; }
.site-nav { display: flex; align-items: center; gap: clamp(1rem, 2vw, 2.2rem); font-size: .86rem; letter-spacing: .08em; }
.site-nav a { opacity: .82; transition: opacity .2s ease, color .2s ease; }
.site-nav a:hover, .site-nav a:focus-visible { opacity: 1; color: #7ee8ff; }
.site-nav .nav-cta { padding: .55rem 1.05rem; color: white; border: 1px solid rgba(255,255,255,.55); opacity: 1; }
.menu-toggle { display: none; width: 46px; height: 46px; padding: 0; border: 0; background: transparent; }
.menu-toggle span:not(.sr-only) { display: block; width: 26px; height: 1px; margin: 7px auto; background: white; transition: transform .25s ease; }

.hero { position: relative; min-height: 760px; height: 100vh; height: 100svh; overflow: hidden; color: white; background: var(--ink); }
.hero-media, .hero-wash, .hero-lines { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-media { object-fit: cover; object-position: 50% 48%; filter: saturate(.82) contrast(1.04); }
.hero-wash { background: linear-gradient(90deg, rgba(4, 22, 38, .96) 0%, rgba(5, 31, 52, .8) 42%, rgba(0, 68, 160, .18) 75%), linear-gradient(0deg, rgba(3, 24, 40, .82), transparent 45%); }
.hero-lines { opacity: .2; background-image: linear-gradient(110deg, transparent 0 56%, rgba(0,174,239,.9) 56% 56.3%, transparent 56.3% 61%, rgba(0,87,216,.9) 61% 61.7%, transparent 61.7%); }
.hero-content { position: relative; z-index: 2; display: flex; flex-direction: column; justify-content: center; height: 100%; padding: 8rem 0 9rem; }
.kicker, .overline { margin: 0 0 1.2rem; color: var(--blue); font-size: .73rem; font-weight: 750; letter-spacing: .22em; text-transform: uppercase; }
.hero .kicker { color: #65dcff; }
.hero h1 { max-width: 1050px; margin: 0; font-family: var(--serif); font-size: clamp(3.8rem, 6.8vw, 7.4rem); font-weight: 600; line-height: 1.08; letter-spacing: -.045em; text-wrap: balance; }
.hero-lead { margin: 2rem 0 0; color: rgba(255,255,255,.74); font-size: clamp(1rem, 1.3vw, 1.22rem); letter-spacing: .12em; }
.hero-actions { display: flex; gap: 1rem; margin-top: 2.6rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: .75rem 1.35rem; border: 1px solid transparent; font-size: .9rem; font-weight: 700; letter-spacing: .06em; transition: transform .22s ease, background .22s ease, border-color .22s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { gap: 2.8rem; color: white; background: var(--blue); }
.button-primary:hover { background: #0a64ef; }
.button-ghost { border-color: rgba(255,255,255,.45); }
.button-ghost:hover { border-color: white; background: rgba(255,255,255,.07); }
.hero-foot { position: absolute; z-index: 2; right: 0; bottom: 0; left: 0; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid rgba(255,255,255,.2); }
.hero-foot span { padding: 1.05rem; color: rgba(255,255,255,.62); border-right: 1px solid rgba(255,255,255,.16); font-size: .74rem; letter-spacing: .08em; text-align: center; }
.hero-foot span:last-child { border-right: 0; }

.section-paper { background: var(--paper); }
.section-mist { background: var(--mist); }
.section-ink { color: white; background: var(--ink); }
.positioning, .services, .cases, .process, .advantages, .media-section { padding: 9rem 0; }
.split-head { display: grid; grid-template-columns: .72fr 2.28fr; gap: 4vw; align-items: start; }
.split-head-dark .display-title { color: white; }
.section-label { display: flex; align-items: center; gap: 1rem; padding-top: .7rem; color: var(--muted); font-size: .75rem; font-weight: 650; letter-spacing: .1em; }
.section-label b { display: inline-grid; width: 34px; height: 34px; color: white; background: var(--blue); place-items: center; font-size: .7rem; }
.display-title { max-width: 1030px; margin: 0; font-family: var(--serif); font-size: clamp(2.8rem, 4.7vw, 5.4rem); font-weight: 600; line-height: 1.16; letter-spacing: -.04em; text-wrap: balance; }
.lead { max-width: 940px; margin: 2rem 0 0; color: #526372; font-size: clamp(1.05rem, 1.45vw, 1.34rem); line-height: 1.9; }
.lead.compact { max-width: 760px; font-size: 1rem; }
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 6rem; border: 1px solid var(--line); }
.value-card { min-height: 280px; padding: 2rem 2.2rem; border-right: 1px solid var(--line); }
.value-card:last-child { border-right: 0; }
.value-card > span, .cooperation-grid span, .advantage-grid span { color: var(--blue); font-size: .73rem; font-weight: 750; }
.value-card h3 { margin: 4.3rem 0 .75rem; font-family: var(--serif); font-size: 2rem; }
.value-card p { margin: 0; color: var(--muted); }

.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 5.5rem; border-top: 1px solid var(--line-dark); border-left: 1px solid var(--line-dark); }
.service-card { position: relative; min-height: 335px; padding: 1.8rem 1.7rem 2rem; border-right: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); background: rgba(255,255,255,.01); transition: background .25s ease, transform .25s ease; }
.service-card:hover { z-index: 1; background: linear-gradient(145deg, rgba(8,86,216,.26), rgba(11,185,233,.08)); transform: translateY(-4px); }
.service-no { color: #45d7ff; font-size: .72rem; font-weight: 750; }
.service-card h3 { margin: 4.3rem 0 .8rem; font-family: var(--serif); font-size: clamp(1.45rem, 1.8vw, 2rem); font-weight: 600; }
.service-card p { margin: 0; color: rgba(255,255,255,.58); font-size: .92rem; }
.service-card small { position: absolute; right: 1.7rem; bottom: 1.55rem; left: 1.7rem; color: #6edfff; font-size: .68rem; letter-spacing: .05em; }

.esg { position: relative; min-height: 760px; display: flex; align-items: end; overflow: hidden; color: white; background: var(--ink); }
.esg > img, .esg-shade { position: absolute; inset: 0; width: 100%; height: 100%; }
.esg > img { object-fit: cover; }
.esg-shade { background: linear-gradient(90deg, rgba(4,24,39,.96), rgba(5,37,60,.72) 48%, rgba(5,37,60,.18) 78%), linear-gradient(0deg, rgba(4,24,39,.8), transparent 55%); }
.esg-copy { position: relative; z-index: 1; padding-bottom: 7rem; }
.esg-copy .overline { color: #66e0ff; }
.esg-copy h2 { margin: 0; font-family: var(--serif); font-size: clamp(3.2rem, 6vw, 6.8rem); line-height: 1.12; letter-spacing: -.045em; }
.esg-copy > p:not(.overline) { max-width: 700px; margin: 1.7rem 0 0; color: rgba(255,255,255,.72); font-size: 1.12rem; }
.esg-steps { display: grid; grid-template-columns: repeat(4, 1fr); max-width: 920px; margin-top: 3rem; border-top: 1px solid rgba(255,255,255,.3); border-bottom: 1px solid rgba(255,255,255,.3); }
.esg-steps span { display: flex; gap: .8rem; padding: .9rem .7rem; border-right: 1px solid rgba(255,255,255,.2); font-size: .82rem; }
.esg-steps span:last-child { border-right: 0; }
.esg-steps b { color: #5bdfff; }

.filter-bar { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 4rem; }
.filter-bar button { padding: .55rem .9rem; border: 1px solid var(--line); border-radius: 999px; background: transparent; cursor: pointer; font-size: .76rem; }
.filter-bar button:hover, .filter-bar button.is-active { color: white; border-color: var(--blue); background: var(--blue); }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 1.5rem; background: var(--line); }
.case-card { position: relative; min-height: 390px; overflow: hidden; color: white; background: var(--ink); transition: opacity .25s ease, transform .25s ease; }
.case-card.case-wide { grid-column: span 2; }
.case-card[hidden] { display: none; }
.case-card > img, .case-overlay, .case-solid { position: absolute; inset: 0; width: 100%; height: 100%; }
.case-card > img { object-fit: cover; transition: transform .6s cubic-bezier(.2,.7,.2,1); }
.case-card:hover > img { transform: scale(1.035); }
.case-overlay { background: linear-gradient(0deg, rgba(4,19,31,.93), rgba(4,19,31,.12) 70%); }
.case-copy { position: absolute; z-index: 1; right: 1.8rem; bottom: 1.8rem; left: 1.8rem; }
.case-copy span, .case-solid span { color: #75e3ff; font-size: .68rem; font-weight: 750; letter-spacing: .1em; }
.case-copy h3, .case-solid h3 { max-width: 780px; margin: .45rem 0 0; font-family: var(--serif); font-size: clamp(1.5rem, 2vw, 2.35rem); line-height: 1.25; }
.case-copy p, .case-solid p { margin: .45rem 0 0; color: rgba(255,255,255,.63); font-size: .82rem; }
.case-solid { display: flex; flex-direction: column; justify-content: flex-end; padding: 1.8rem; }
.case-solid.blue { background: linear-gradient(145deg, #0b69df, #082f76); }
.case-solid.navy { background: linear-gradient(145deg, #0d3555, #051726); }
.case-solid.cyan { background: linear-gradient(145deg, #009ad3, #075487); }
.case-solid.red { background: linear-gradient(145deg, #d83239, #7c0e1c); }
.case-solid.gold { background: linear-gradient(145deg, #a77b2f, #5e3f13); }
.case-solid.light { color: var(--ink); background: linear-gradient(145deg, #e9eef1, #c6d8e3); }
.case-solid.light span { color: var(--blue); }
.case-solid.light p { color: #4f6575; }

.media-head { max-width: 900px; }
.media-wall { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .85rem; margin-top: 4.5rem; }
.media-card { display: flex; flex-direction: column; justify-content: space-between; min-height: 164px; padding: 1.1rem; border: 1px solid rgba(14, 40, 61, .12); background: rgba(255,255,255,.88); box-shadow: 0 12px 30px rgba(9,37,58,.05); transition: transform .24s ease, box-shadow .24s ease; }
.media-card:hover { z-index: 1; box-shadow: 0 17px 36px rgba(9,37,58,.12); transform: translateY(-3px); }
.media-card img { width: 100%; height: 78px; object-fit: contain; object-position: center; }
.media-card h3 { margin: .7rem 0 0; color: #526372; font-size: .71rem; font-weight: 650; letter-spacing: .04em; line-height: 1.35; text-align: center; }

.cooperation-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 5rem; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.cooperation-grid article { min-height: 250px; padding: 1.8rem 2rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.cooperation-grid h3 { margin: 3.2rem 0 .7rem; font-family: var(--serif); font-size: 1.7rem; }
.cooperation-grid p { margin: 0; color: var(--muted); }
.process-track { display: grid; grid-template-columns: repeat(6, 1fr); margin-top: 3rem; padding: 0; list-style: none; border-top: 2px solid var(--blue); }
.process-track li { position: relative; padding: 1.3rem .7rem; border-right: 1px solid var(--line); }
.process-track li::before { content: ""; position: absolute; top: -6px; left: 0; width: 10px; height: 10px; background: var(--blue); border-radius: 50%; }
.process-track b { color: var(--blue); font-size: .66rem; }
.process-track span { display: block; margin-top: 1.3rem; font-size: .88rem; font-weight: 650; }

.advantage-grid { display: grid; grid-template-columns: repeat(2, 1fr); margin-top: 5rem; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.advantage-grid article { min-height: 260px; padding: 2rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.advantage-grid h3 { margin: 3rem 0 .7rem; font-family: var(--serif); font-size: 2rem; }
.advantage-grid p { max-width: 560px; margin: 0; color: var(--muted); }

.portfolio { padding: 7rem 0; color: white; background: linear-gradient(115deg, #0755d4, #0aa9dc); }
.portfolio-grid { display: grid; grid-template-columns: 1fr auto; gap: 6vw; align-items: center; }
.portfolio .overline { color: rgba(255,255,255,.75); }
.portfolio h2 { margin: 0; font-family: var(--serif); font-size: clamp(3rem, 5.2vw, 6rem); line-height: 1.12; }
.portfolio p:not(.overline) { color: rgba(255,255,255,.7); }
.qr-card { width: 280px; padding: 1rem; color: var(--ink); background: white; box-shadow: 0 28px 80px rgba(4,33,61,.25); }
.qr-card img { width: 100%; }
.qr-card span { display: block; margin-top: .55rem; font-size: .72rem; text-align: center; }

.contact { position: relative; overflow: hidden; padding: 9rem 0 8rem; color: white; background: var(--ink); }
.contact-lines { position: absolute; inset: 0; opacity: .18; background: repeating-linear-gradient(115deg, transparent 0 95px, #0879e8 96px 97px); }
.contact-inner { position: relative; z-index: 1; }
.contact .overline { color: #64e2ff; }
.contact h2 { max-width: 1150px; margin: 0; font-family: var(--serif); font-size: clamp(3rem, 5.5vw, 6.3rem); line-height: 1.14; letter-spacing: -.045em; }
.contact-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 3rem; margin-top: 4rem; padding-top: 2rem; border-top: 1px solid rgba(255,255,255,.35); }
.contact-row div { display: flex; flex-direction: column; }
.contact-row span { color: rgba(255,255,255,.45); font-size: .7rem; letter-spacing: .12em; }
.contact-row a { margin-top: .6rem; font-size: clamp(1rem, 1.5vw, 1.3rem); font-weight: 650; }
.site-footer { padding: 2.4rem 0; color: rgba(255,255,255,.55); background: #03121e; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.footer-inner img { width: 145px; }
.footer-inner p, .footer-inner a { margin: 0; font-size: .7rem; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .75s cubic-bezier(.2,.7,.2,1), transform .75s cubic-bezier(.2,.7,.2,1); }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1100px) {
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .media-wall { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .contact-row { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 780px) {
  :root { --shell: min(89vw, 680px); }
  .site-header { height: 72px; padding-inline: 5.5vw; }
  .brand { width: 104px; }
  .brand img { width: 96px; }
  .menu-toggle { display: block; position: relative; z-index: 2; }
  .site-nav { position: fixed; inset: 0; flex-direction: column; justify-content: center; gap: 1.3rem; padding: 6rem 8vw; background: rgba(7,30,49,.98); transform: translateX(100%); transition: transform .3s ease; font-size: 1.35rem; }
  .site-nav.is-open { transform: none; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }
  .hero { min-height: 720px; }
  .hero-media { object-position: 63% center; }
  .hero-wash { background: linear-gradient(90deg, rgba(4,22,38,.95), rgba(5,31,52,.35)), linear-gradient(0deg, rgba(3,24,40,.9), transparent 55%); }
  .hero-content { justify-content: flex-end; padding-bottom: 11rem; }
  .hero h1 { font-size: clamp(3.2rem, 13vw, 5rem); }
  .hero-lead { font-size: .88rem; letter-spacing: .07em; }
  .hero-actions { flex-wrap: wrap; }
  .button { min-height: 48px; }
  .hero-foot { grid-template-columns: repeat(2, 1fr); }
  .hero-foot span:nth-child(n+3) { display: none; }
  .positioning, .services, .cases, .process, .advantages, .media-section { padding: 6.5rem 0; }
  .split-head { grid-template-columns: 1fr; gap: 1.6rem; }
  .display-title { font-size: clamp(2.7rem, 11vw, 4.4rem); }
  .value-grid, .service-grid, .case-grid, .cooperation-grid, .advantage-grid { grid-template-columns: 1fr; }
  .value-card { min-height: 230px; border-right: 0; border-bottom: 1px solid var(--line); }
  .value-card h3 { margin-top: 3rem; }
  .service-card { min-height: 300px; }
  .esg { min-height: 720px; }
  .esg-shade { background: linear-gradient(0deg, rgba(4,24,39,.96), rgba(5,37,60,.35) 78%); }
  .esg-copy { padding-bottom: 4.5rem; }
  .esg-steps { grid-template-columns: repeat(2, 1fr); }
  .case-card.case-wide { grid-column: auto; }
  .case-card { min-height: 350px; }
  .media-wall { grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 3rem; }
  .media-card { min-height: 146px; padding: .85rem; }
  .media-card img { height: 66px; }
  .process-track { grid-template-columns: repeat(2, 1fr); }
  .portfolio-grid { grid-template-columns: 1fr; }
  .qr-card { width: min(70vw, 280px); margin-top: 2rem; }
  .contact { padding: 6.5rem 0; }
  .contact-row { grid-template-columns: 1fr; gap: 1.8rem; }
  .footer-inner { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 520px) {
  :root { --shell: min(90vw, 460px); }
  body { font-size: 15px; }
  .hero { min-height: 680px; }
  .hero-content { padding-top: 7.5rem; padding-bottom: 10.25rem; }
  .hero h1 { font-size: clamp(2.7rem, 13vw, 4rem); }
  .hero-actions { gap: .7rem; margin-top: 2rem; }
  .button { width: 100%; }
  .button-primary { gap: 1.6rem; }
  .hero-foot span { padding: .8rem .3rem; font-size: .65rem; }
  .display-title, .contact h2 { overflow-wrap: anywhere; }
  .esg-copy h2 { font-size: clamp(2.7rem, 12vw, 4rem); }
  .esg-steps { margin-top: 2rem; }
  .esg-steps span { gap: .5rem; padding: .75rem .45rem; font-size: .73rem; }
  .filter-bar { gap: .4rem; margin-top: 2.5rem; }
  .filter-bar button { padding: .48rem .68rem; font-size: .69rem; }
  .case-copy { right: 1.25rem; bottom: 1.3rem; left: 1.25rem; }
  .case-copy h3 { font-size: 1.65rem; }
  .media-wall { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .65rem; }
  .media-card { min-height: 132px; padding: .75rem; }
  .media-card img { height: 58px; }
  .media-card h3 { margin-top: .5rem; font-size: .65rem; }
  .contact-row { grid-template-columns: 1fr; gap: 1.35rem; margin-top: 2.7rem; }
  .contact-row a { font-size: 1rem; }
  .qr-card { width: min(78vw, 280px); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}