:root {
  --ink: #132a32;
  --ink-deep: #0b2028;
  --muted: #65767b;
  --line: #dce4e3;
  --paper: #ffffff;
  --mist: #f3f7f6;
  --teal: #0b7c78;
  --teal-dark: #075f5c;
  --aqua: #31c5bb;
  --gold: #eab657;
  --shadow: 0 18px 50px rgba(17, 42, 50, 0.12);
  --container: min(1180px, calc(100% - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 78px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif; line-height: 1.65; -webkit-font-smoothing: antialiased; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }
svg { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.container { width: var(--container); margin-inline: auto; }
.section { padding: 108px 0; }

.site-header { position: fixed; z-index: 100; inset: 0 0 auto; background: rgba(255, 255, 255, 0.97); border-bottom: 1px solid transparent; transition: box-shadow .3s, border-color .3s; }
.site-header.scrolled { border-color: #e8edec; box-shadow: 0 10px 30px rgba(13, 43, 50, .08); }
.header-inner { height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; color: var(--teal); border: 1px solid #c9dedd; }
.brand-mark svg { width: 31px; height: 31px; stroke-width: 2; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.08; }
.brand-copy strong { font-size: 21px; letter-spacing: 2px; }
.brand-copy small { font-size: 8px; color: #6e8185; letter-spacing: 1.6px; margin-top: 6px; }
.desktop-nav { display: flex; align-items: center; gap: clamp(22px, 2.4vw, 38px); margin-left: auto; }
.desktop-nav a { position: relative; padding: 27px 0 25px; color: #334b52; font-size: 14px; font-weight: 600; }
.desktop-nav a::after { content: ""; position: absolute; height: 2px; left: 50%; right: 50%; bottom: 18px; background: var(--teal); transition: left .25s, right .25s; }
.desktop-nav a:hover::after { left: 0; right: 0; }
.header-phone { display: flex; align-items: center; gap: 9px; padding-left: 22px; border-left: 1px solid var(--line); color: var(--ink); font: 700 16px/1.15 Arial, sans-serif; }
.header-phone svg { width: 22px; height: 22px; color: var(--teal); }
.header-phone span { display: flex; flex-direction: column; }
.header-phone small { font: 500 11px/1.2 "Microsoft YaHei", sans-serif; color: #728287; margin-bottom: 4px; }
.menu-toggle { display: none; width: 42px; height: 42px; border: 0; background: transparent; align-items: center; justify-content: center; cursor: pointer; }
.menu-toggle svg { width: 25px; height: 25px; }
.close-icon { display: none; }
.mobile-nav { display: none; }

.hero { position: relative; min-height: 780px; height: min(88vh, 900px); margin-top: 78px; overflow: hidden; display: flex; align-items: center; color: white; }
.hero-backdrop { position: absolute; inset: 0; background-image: url("https://images.unsplash.com/photo-1565008447742-97f6f38c985c?auto=format&fit=crop&w=2000&q=90"); background-position: center 52%; background-size: cover; transform: scale(1.02); }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5, 29, 36, .95) 0%, rgba(6, 35, 43, .82) 43%, rgba(6, 35, 43, .35) 72%, rgba(6, 35, 43, .15) 100%), linear-gradient(0deg, rgba(8, 33, 38, .4), transparent 45%); }
.hero-content { position: relative; z-index: 1; padding-top: 12px; }
.hero-kicker { display: flex; align-items: center; gap: 13px; color: #eaf5f3; font-size: 14px; letter-spacing: 2px; }
.hero-kicker span { width: 34px; height: 2px; background: var(--aqua); }
.hero h1 { max-width: 760px; margin: 26px 0 23px; font-size: clamp(48px, 5.6vw, 78px); line-height: 1.16; letter-spacing: 0; font-weight: 750; }
.hero h1 em { color: #c8eeea; font-style: normal; font-size: .78em; font-weight: 600; }
.hero-content > p { max-width: 640px; margin: 0; color: rgba(255,255,255,.78); font-size: 18px; line-height: 1.9; }
.hero-actions { display: flex; gap: 14px; margin-top: 38px; }
.btn { min-height: 50px; padding: 0 28px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; border: 1px solid transparent; border-radius: 3px; cursor: pointer; font-weight: 650; transition: transform .2s, background .2s, border-color .2s; }
.btn:hover { transform: translateY(-2px); }
.btn svg { width: 20px; height: 20px; }
.btn-primary { background: var(--teal); color: white; box-shadow: 0 10px 30px rgba(6, 115, 109, .25); }
.btn-primary:hover { background: var(--teal-dark); }
.btn-outline { color: white; border-color: rgba(255,255,255,.45); background: rgba(255,255,255,.05); backdrop-filter: blur(4px); }
.btn-outline:hover { border-color: white; background: rgba(255,255,255,.12); }
.hero-trust { display: flex; gap: 0; margin-top: 56px; width: min(630px, 100%); border-top: 1px solid rgba(255,255,255,.2); padding-top: 22px; }
.hero-trust > div { display: flex; flex-direction: column; flex: 1; min-width: 0; padding-right: 20px; }
.hero-trust > div + div { border-left: 1px solid rgba(255,255,255,.2); padding-left: 28px; }
.hero-trust strong { color: #fff; font-size: 18px; letter-spacing: 1px; }
.hero-trust span { color: rgba(255,255,255,.58); margin-top: 4px; font-size: 12px; }
.hero-scroll { position: absolute; z-index: 2; right: max(32px, calc((100vw - 1180px) / 2)); bottom: 35px; display: flex; flex-direction: column; align-items: center; color: rgba(255,255,255,.7); }
.hero-scroll span { font-size: 8px; letter-spacing: 3px; writing-mode: vertical-rl; }
.hero-scroll svg { width: 20px; margin-top: 12px; animation: bounce 1.8s infinite; }
@keyframes bounce { 50% { transform: translateY(6px); } }

.section-head { margin-bottom: 46px; }
.section-head h2 { margin: 12px 0 12px; color: var(--ink); font-size: clamp(34px, 4vw, 48px); line-height: 1.25; letter-spacing: 0; }
.section-head > p { max-width: 620px; margin: 0; color: var(--muted); }
.split-head { display: flex; align-items: end; justify-content: space-between; gap: 60px; }
.split-head > p { max-width: 500px; padding-bottom: 8px; }
.eyebrow { color: var(--teal); font-size: 12px; font-weight: 700; letter-spacing: 2.6px; }
.eyebrow.light { color: #68d3cb; }

.services { background: #fff; }
.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.service-card { position: relative; overflow: hidden; padding: 38px 34px 32px; border: 1px solid var(--line); border-top: 3px solid var(--teal); background: white; min-height: 435px; transition: transform .3s, box-shadow .3s; }
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.service-card.featured { color: white; border-color: var(--teal-dark); background: var(--teal-dark); }
.service-card.featured::before { content: ""; position: absolute; width: 200px; height: 200px; right: -100px; top: -100px; border: 1px solid rgba(255,255,255,.12); transform: rotate(45deg); }
.service-index { position: absolute; top: 29px; right: 30px; color: #b8c5c6; font: 500 13px/1 Arial; }
.featured .service-index { color: rgba(255,255,255,.45); }
.service-icon { width: 58px; height: 58px; display: grid; place-items: center; color: var(--teal); background: #ebf7f5; }
.featured .service-icon { color: white; background: rgba(255,255,255,.12); }
.service-icon svg { width: 31px; height: 31px; }
.service-card h3 { margin: 25px 0 13px; font-size: 22px; }
.service-card p { min-height: 82px; margin: 0; color: var(--muted); font-size: 14px; }
.featured p { color: rgba(255,255,255,.7); }
.service-card ul { display: flex; gap: 8px; flex-wrap: wrap; list-style: none; padding: 0; margin: 22px 0 25px; }
.service-card li { padding: 4px 9px; background: var(--mist); color: #587076; font-size: 11px; }
.featured li { color: rgba(255,255,255,.78); background: rgba(255,255,255,.1); }
.service-card > a { display: inline-flex; gap: 14px; align-items: center; color: var(--teal); font-size: 13px; font-weight: 700; }
.service-card > a span { font-size: 18px; transition: transform .2s; }
.service-card > a:hover span { transform: translateX(5px); }
.featured > a { color: #9ce3dd; }
.service-strip { margin-top: 24px; padding: 20px 27px; background: var(--mist); display: flex; align-items: center; justify-content: space-between; gap: 20px; font-size: 14px; }
.service-strip > span { color: var(--muted); font-size: 12px; }
.service-strip div { display: flex; align-items: center; gap: 9px; font-weight: 600; }
.service-strip i { width: 5px; height: 5px; border-radius: 50%; background: var(--gold); }

.process { background: var(--ink-deep); color: white; overflow: hidden; }
.process-layout { display: grid; grid-template-columns: .76fr 1.24fr; gap: 90px; align-items: start; }
.process-intro { position: sticky; top: 130px; padding-top: 8px; }
.process-intro h2 { margin: 13px 0 22px; font-size: clamp(38px, 4vw, 54px); line-height: 1.28; }
.process-intro p { color: rgba(255,255,255,.6); max-width: 420px; }
.text-link { display: inline-flex; align-items: center; gap: 18px; margin-top: 25px; color: #80ddd6; font-weight: 650; font-size: 14px; }
.text-link span { font-size: 20px; }
.process-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid rgba(255,255,255,.12); }
.process-list li { display: grid; grid-template-columns: 76px 1fr; gap: 24px; padding: 28px 0; border-bottom: 1px solid rgba(255,255,255,.12); }
.step-num { color: #5ed0c8; font: 600 14px/1.5 Arial; padding-top: 5px; }
.process-list h3 { margin: 0 0 5px; font-size: 19px; }
.process-list p { margin: 0; color: rgba(255,255,255,.55); font-size: 14px; }

.cases { background: var(--mist); }
.case-grid { display: grid; grid-template-columns: 1.15fr .85fr; grid-template-rows: repeat(2, 300px); gap: 18px; }
.case-card { position: relative; overflow: hidden; color: white; }
.case-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(5,24,29,.84), transparent 65%); }
.case-large { grid-row: 1 / 3; }
.case-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s; }
.case-card:hover img { transform: scale(1.04); }
.case-caption { position: absolute; z-index: 1; left: 30px; right: 30px; bottom: 26px; }
.case-caption span { color: #8de1da; font-size: 11px; letter-spacing: 1.5px; }
.case-caption h3 { margin: 5px 0 0; font-size: 22px; }
.case-large .case-caption h3 { font-size: 28px; }
.case-caption p { margin: 4px 0 0; color: rgba(255,255,255,.65); font-size: 13px; }

.about-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; align-items: center; }
.about-visual { position: relative; padding: 0 36px 36px 0; }
.about-visual::before { content: ""; position: absolute; right: 0; bottom: 0; width: 70%; height: 75%; background: #dfeceb; }
.about-visual img { position: relative; z-index: 1; height: 565px; object-fit: cover; }
.about-badge { position: absolute; z-index: 2; right: 0; bottom: 65px; width: 235px; padding: 22px 24px; color: white; background: var(--teal-dark); box-shadow: var(--shadow); }
.about-badge strong, .about-badge span { display: block; }
.about-badge strong { font-size: 18px; }
.about-badge span { margin-top: 3px; color: rgba(255,255,255,.64); font-size: 11px; }
.about-copy h2 { margin: 14px 0 22px; font-size: clamp(36px, 4vw, 50px); line-height: 1.25; }
.about-copy p { color: var(--muted); }
.about-copy .lead { color: #334b52; font-size: 17px; line-height: 1.9; }
.about-points { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 20px; margin-top: 30px; padding-top: 27px; border-top: 1px solid var(--line); }
.about-points > div { display: flex; align-items: flex-start; gap: 11px; }
.about-points span { flex: 0 0 auto; width: 23px; height: 23px; display: grid; place-items: center; color: white; background: var(--teal); font-size: 12px; }
.about-points p { display: flex; flex-direction: column; margin: 0; font-size: 12px; }
.about-points strong { color: var(--ink); font-size: 14px; }

.faq { background: var(--mist); }
.faq-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 90px; align-items: start; }
.faq .section-head { position: sticky; top: 120px; margin: 0; }
.faq .section-head h2 { font-size: 42px; }
.faq .section-head p { margin-top: 20px; }
.accordion { border-top: 1px solid #cfdad9; }
.accordion details { border-bottom: 1px solid #cfdad9; }
.accordion summary { position: relative; padding: 25px 55px 25px 4px; list-style: none; cursor: pointer; font-weight: 700; }
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary span::before, .accordion summary span::after { content: ""; position: absolute; right: 8px; top: 50%; width: 14px; height: 1px; background: var(--teal); transition: transform .2s; }
.accordion summary span::after { transform: rotate(90deg); }
.accordion details[open] summary span::after { transform: rotate(0); }
.accordion details p { margin: -4px 55px 24px 4px; color: var(--muted); font-size: 14px; }

.contact { padding-top: 90px; background: white; }
.contact-panel { display: grid; grid-template-columns: .82fr 1.18fr; overflow: hidden; background: var(--ink-deep); color: white; box-shadow: 0 24px 60px rgba(14, 42, 49, .16); }
.contact-copy { padding: 56px 50px; background: linear-gradient(145deg, rgba(11,124,120,.35), transparent 60%); }
.contact-copy h2 { margin: 13px 0 18px; font-size: clamp(35px, 3.5vw, 46px); line-height: 1.3; }
.contact-copy > p { color: rgba(255,255,255,.6); }
.contact-number { display: flex; align-items: center; gap: 16px; margin-top: 34px; color: white; }
.contact-number > svg { width: 45px; height: 45px; padding: 11px; color: #8ce1da; border: 1px solid rgba(255,255,255,.25); }
.contact-number span { display: flex; flex-direction: column; font: 700 25px/1.15 Arial; }
.contact-number small { margin-bottom: 5px; color: rgba(255,255,255,.55); font: 500 11px/1.2 "Microsoft YaHei", sans-serif; }
.inquiry-form { padding: 50px; background: white; color: var(--ink); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.inquiry-form label { display: block; margin-bottom: 17px; color: #42575c; font-size: 13px; font-weight: 650; }
.inquiry-form input, .inquiry-form select, .inquiry-form textarea { width: 100%; margin-top: 7px; padding: 12px 14px; color: var(--ink); background: #f4f7f6; border: 1px solid #e1e8e7; border-radius: 2px; outline: none; transition: border .2s, box-shadow .2s; }
.inquiry-form input, .inquiry-form select { height: 46px; }
.inquiry-form textarea { resize: vertical; }
.inquiry-form input:focus, .inquiry-form select:focus, .inquiry-form textarea:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(11,124,120,.1); }
.form-submit { width: 100%; margin-top: 2px; border: 0; }
.form-note { margin: 10px 0 0; text-align: center; color: #829095; font-size: 10px; }

.site-footer { padding-top: 70px; color: rgba(255,255,255,.58); background: #081920; }
.footer-main { display: grid; grid-template-columns: 1.5fr .7fr 1fr; gap: 70px; padding-bottom: 55px; }
.brand.inverted { color: white; }
.inverted .brand-mark { color: #6bd4cc; border-color: rgba(255,255,255,.2); }
.inverted .brand-copy small { color: rgba(255,255,255,.42); }
.footer-brand p { margin-top: 22px; font-size: 13px; line-height: 2; }
.footer-links, .footer-contact { display: flex; flex-direction: column; gap: 9px; font-size: 13px; }
.footer-links strong, .footer-contact strong { color: white; margin-bottom: 11px; font-size: 14px; }
.footer-links a:hover, .footer-contact a:hover { color: #83ddd6; }
.footer-bottom { padding: 20px 0; display: flex; justify-content: space-between; border-top: 1px solid rgba(255,255,255,.08); font-size: 11px; }
.mobile-contact-bar { display: none; }
.toast { position: fixed; z-index: 200; left: 50%; bottom: 35px; transform: translate(-50%, 20px); padding: 13px 20px; color: white; background: var(--ink-deep); box-shadow: var(--shadow); border-radius: 3px; font-size: 13px; opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 1040px) {
  .desktop-nav { gap: 18px; }
  .desktop-nav a { font-size: 13px; }
  .header-phone { display: none; }
  .process-layout, .about-layout, .faq-layout { gap: 55px; }
}

@media (max-width: 820px) {
  :root { --container: min(100% - 32px, 680px); }
  html { scroll-padding-top: 66px; }
  .section { padding: 75px 0; }
  .header-inner { height: 66px; }
  .brand-mark { width: 36px; height: 36px; }
  .brand-mark svg { width: 27px; height: 27px; }
  .brand-copy strong { font-size: 18px; }
  .brand-copy small { font-size: 7px; margin-top: 5px; }
  .desktop-nav { display: none; }
  .menu-toggle { display: flex; }
  .menu-open .menu-icon { display: none; }
  .menu-open .close-icon { display: block; }
  .mobile-nav { position: fixed; inset: 66px 0 0; padding: 25px 24px; display: flex; flex-direction: column; gap: 0; color: var(--ink); background: white; transform: translateX(100%); transition: transform .3s ease; }
  .menu-open .mobile-nav { transform: translateX(0); }
  .mobile-nav a { padding: 18px 4px; border-bottom: 1px solid var(--line); font-size: 17px; font-weight: 650; }
  .hero { height: auto; min-height: 720px; margin-top: 66px; align-items: flex-end; padding: 80px 0 48px; }
  .hero-backdrop { background-position: 61% center; }
  .hero-overlay { background: linear-gradient(90deg, rgba(5, 29, 36, .93), rgba(5,29,36,.55)), linear-gradient(0deg, rgba(5,29,36,.75), transparent); }
  .hero h1 { font-size: clamp(40px, 11vw, 60px); margin-top: 20px; }
  .hero-content > p { font-size: 16px; }
  .hero-trust { margin-top: 43px; }
  .hero-trust > div { padding-right: 10px; }
  .hero-trust > div + div { padding-left: 13px; }
  .hero-trust strong { font-size: 14px; }
  .hero-trust span { font-size: 10px; }
  .hero-scroll { display: none; }
  .split-head { display: block; }
  .split-head > p { margin-top: 8px; }
  .service-grid { grid-template-columns: 1fr; }
  .service-card { min-height: 0; }
  .service-card p { min-height: 0; }
  .service-strip { flex-wrap: wrap; justify-content: flex-start; }
  .service-strip > span { width: 100%; }
  .service-strip div { width: calc(33.333% - 14px); }
  .process-layout, .about-layout, .faq-layout, .contact-panel { grid-template-columns: 1fr; }
  .process-intro, .faq .section-head { position: static; }
  .process-list { margin-top: 20px; }
  .case-grid { grid-template-columns: 1fr; grid-template-rows: 420px 250px 250px; }
  .case-large { grid-row: auto; }
  .about-visual { max-width: 620px; }
  .about-visual img { height: 500px; }
  .about-copy { margin-top: 10px; }
  .contact-copy, .inquiry-form { padding: 42px 36px; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  :root { --container: calc(100% - 28px); }
  body { padding-bottom: 62px; }
  .section { padding: 64px 0; }
  .hero { min-height: 680px; padding-bottom: 35px; }
  .hero h1 { font-size: 40px; }
  .hero h1 em { font-size: .65em; }
  .hero-content > p { font-size: 14px; line-height: 1.8; }
  .hero-actions { gap: 9px; margin-top: 28px; }
  .hero-actions .btn { flex: 1; padding: 0 12px; font-size: 14px; }
  .hero-trust { margin-top: 36px; }
  .hero-trust span { line-height: 1.45; }
  .section-head { margin-bottom: 32px; }
  .section-head h2 { font-size: 32px; }
  .service-card { padding: 31px 25px; }
  .service-strip { padding: 19px 20px; }
  .service-strip div { width: calc(50% - 10px); }
  .process-layout { gap: 30px; }
  .process-intro h2 { font-size: 38px; }
  .process-list li { grid-template-columns: 44px 1fr; gap: 11px; }
  .case-grid { grid-template-rows: 360px 225px 225px; }
  .case-caption { left: 20px; right: 20px; bottom: 20px; }
  .case-large .case-caption h3, .case-caption h3 { font-size: 21px; }
  .about-layout { gap: 42px; }
  .about-visual { padding: 0 20px 20px 0; }
  .about-visual img { height: 400px; }
  .about-badge { right: 0; bottom: 38px; width: 205px; padding: 17px 19px; }
  .about-copy h2 { font-size: 34px; }
  .about-copy .lead { font-size: 15px; }
  .about-points { grid-template-columns: 1fr; }
  .faq-layout { gap: 34px; }
  .faq .section-head h2 { font-size: 32px; }
  .contact { padding: 0; }
  .contact .container { width: 100%; }
  .contact-copy, .inquiry-form { padding: 38px 24px; }
  .contact-copy h2 { font-size: 34px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .footer-main { grid-template-columns: 1fr; gap: 38px; }
  .footer-brand { grid-column: auto; }
  .footer-bottom { flex-direction: column; gap: 5px; }
  .mobile-contact-bar { position: fixed; z-index: 90; display: grid; grid-template-columns: 1fr 1.35fr; left: 0; right: 0; bottom: 0; height: 62px; background: white; box-shadow: 0 -8px 30px rgba(8, 34, 42, .13); }
  .mobile-contact-bar a { display: flex; align-items: center; justify-content: center; gap: 8px; color: var(--ink); font-size: 14px; font-weight: 650; }
  .mobile-contact-bar a:last-child { color: white; background: var(--teal); }
  .mobile-contact-bar svg { width: 20px; height: 20px; }
  .toast { bottom: 80px; max-width: calc(100% - 30px); text-align: center; }
}

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