:root {
  --orange: #f04421;
  --orange-dark: #d73216;
  --ink: #16191d;
  --muted: #646b73;
  --line: #e4e6e8;
  --soft: #f5f6f7;
  --white: #fff;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif; line-height: 1.65; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; }
.container { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
.section { padding: 104px 0; }

.site-header { position: fixed; z-index: 50; top: 0; left: 0; width: 100%; border-bottom: 1px solid transparent; transition: .3s ease; }
.site-header.scrolled { background: rgba(255,255,255,.96); border-color: var(--line); box-shadow: 0 8px 30px rgba(12,16,20,.08); backdrop-filter: blur(12px); }
.nav-shell { width: min(1280px, calc(100% - 48px)); height: 82px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--white); }
.site-header.scrolled .brand { color: var(--ink); }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 6px; background: var(--orange); color: #fff; font: 800 30px/1 Arial; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.15; }
.brand-copy b { font-size: 20px; letter-spacing: 0; }
.brand-copy small { margin-top: 4px; font-size: 10px; text-transform: uppercase; opacity: .75; }
.main-nav { display: flex; align-items: center; gap: 38px; color: var(--white); font-size: 15px; }
.site-header.scrolled .main-nav { color: var(--ink); }
.main-nav > a:not(.nav-cta) { position: relative; }
.main-nav > a:not(.nav-cta)::after { content: ""; position: absolute; left: 0; bottom: -8px; width: 0; height: 2px; background: var(--orange); transition: width .2s; }
.main-nav > a:hover::after { width: 100%; }
.nav-cta { padding: 10px 18px; border: 1px solid rgba(255,255,255,.6); border-radius: 4px; }
.site-header.scrolled .nav-cta { color: #fff; background: var(--orange); border-color: var(--orange); }
.menu-toggle { display: none; border: 0; background: transparent; padding: 8px; }
.menu-toggle span { display: block; width: 24px; height: 2px; margin: 5px 0; background: currentColor; }

.hero { position: relative; min-height: 760px; height: 92vh; max-height: 930px; display: flex; align-items: center; color: #fff; overflow: hidden; }
.hero-bg, .hero-overlay { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-bg { object-fit: cover; object-position: 58% center; }
.hero-overlay { background: linear-gradient(90deg, rgba(10,13,17,.88) 0%, rgba(10,13,17,.72) 43%, rgba(10,13,17,.18) 75%, rgba(10,13,17,.18) 100%); }
.hero-content { position: relative; z-index: 2; padding-top: 56px; }
.eyebrow, .section-kicker { margin: 0 0 16px; color: var(--orange); font-size: 13px; font-weight: 700; letter-spacing: 2px; }
.eyebrow { color: #ffb29f; }
.hero h1 { margin: 0; font-size: clamp(64px, 7vw, 106px); line-height: 1; letter-spacing: 0; }
.hero-lead { margin: 24px 0 8px; font-size: 30px; font-weight: 600; }
.hero-desc { max-width: 610px; margin: 0; color: rgba(255,255,255,.78); font-size: 18px; }
.hero-actions { display: flex; gap: 14px; margin-top: 36px; }
.btn { min-height: 52px; padding: 0 24px; display: inline-flex; align-items: center; justify-content: center; gap: 28px; border: 1px solid transparent; border-radius: 4px; font-weight: 600; transition: transform .2s, background .2s; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--orange); color: #fff; }
.btn-primary:hover { background: var(--orange-dark); }
.btn-ghost { border-color: rgba(255,255,255,.55); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.1); }
.hero-proof { position: absolute; z-index: 3; right: 0; bottom: 0; width: min(680px, 54vw); display: grid; grid-template-columns: repeat(3,1fr); background: rgba(255,255,255,.96); color: var(--ink); }
.hero-proof div { padding: 26px 28px; border-left: 1px solid var(--line); }
.hero-proof strong, .hero-proof span { display: block; }
.hero-proof strong { font-size: 20px; }
.hero-proof span { margin-top: 2px; color: var(--muted); font-size: 12px; }

.intro { padding: 92px 0; }
.intro-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 100px; align-items: end; }
h2 { margin: 0; font-size: 42px; line-height: 1.28; letter-spacing: 0; }
.intro-copy { margin: 0; color: var(--muted); font-size: 17px; }
.solutions { background: var(--soft); }
.section-head { margin-bottom: 42px; display: flex; align-items: end; justify-content: space-between; gap: 40px; }
.section-head > p { max-width: 360px; margin: 0 0 6px; color: var(--muted); }
.solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.solution-card { min-height: 330px; padding: 30px; position: relative; background: #fff; border: 1px solid #eceeef; transition: transform .25s, box-shadow .25s, border-color .25s; }
.solution-card:hover { transform: translateY(-5px); border-color: #ffd0c5; box-shadow: 0 18px 40px rgba(27,33,38,.09); }
.solution-card.featured { background: var(--orange); color: #fff; border-color: var(--orange); }
.icon-box { width: 46px; height: 46px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 4px; color: var(--orange); font-size: 22px; }
.featured .icon-box { border-color: rgba(255,255,255,.4); color: #fff; }
.card-number { position: absolute; right: 26px; top: 17px; margin: 0; color: #c5c9cc; font: 700 38px/1 Arial; opacity: .5; }
.featured .card-number { color: #fff; }
.solution-card h3 { margin: 31px 0 10px; font-size: 22px; }
.solution-card > p:not(.card-number) { margin: 0; color: var(--muted); font-size: 15px; }
.featured > p:not(.card-number) { color: rgba(255,255,255,.83); }
.card-link { position: absolute; left: 30px; bottom: 26px; color: var(--orange); font-size: 13px; font-weight: 700; }
.featured .card-link { color: #fff; }

.workflow { color: #fff; background: #191d21; }
.workflow-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 100px; align-items: center; }
.section-kicker.light { color: #ff9f89; }
.workflow-copy > p:not(.section-kicker) { margin: 24px 0 28px; color: #abb0b5; }
.text-link { color: #fff; font-weight: 600; }
.text-link span { margin-left: 12px; color: var(--orange); }
.steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid #383d42; }
.steps li { display: grid; grid-template-columns: 70px 1fr; padding: 24px 0; border-bottom: 1px solid #383d42; }
.steps > li > span { color: var(--orange); font: 700 14px Arial; }
.steps h3, .steps p { margin: 0; }
.steps h3 { font-size: 21px; }
.steps p { margin-top: 2px; color: #9ca2a8; }

.scenario-layout { display: grid; grid-template-columns: 1.15fr .85fr; min-height: 520px; }
.scenario-image { position: relative; overflow: hidden; }
.scenario-image img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.8) contrast(1.05); }
.scenario-image::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(10,13,17,.7), transparent 48%); }
.scenario-image span { position: absolute; z-index: 2; left: 32px; bottom: 28px; color: #fff; font-weight: 600; }
.scenario-list { background: var(--soft); }
.scenario-list article { min-height: 173px; padding: 33px 36px; display: grid; grid-template-columns: 52px 1fr; border-bottom: 1px solid var(--line); }
.scenario-list article:last-child { border-bottom: 0; }
.scenario-list b { color: var(--orange); font: 700 13px Arial; }
.scenario-list h3, .scenario-list p { margin: 0; }
.scenario-list h3 { font-size: 21px; }
.scenario-list p { margin-top: 7px; color: var(--muted); font-size: 14px; }

.metrics { padding-top: 0; }
.metrics-grid { display: grid; grid-template-columns: 1.4fr repeat(3, .65fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.metric-intro, .metric { padding: 50px 34px; }
.metric-intro { padding-left: 0; }
.metric-intro h2 { font-size: 34px; }
.metric-intro > p:last-child { max-width: 390px; color: var(--muted); }
.metric { display: flex; flex-direction: column; justify-content: center; border-left: 1px solid var(--line); }
.metric strong { color: var(--orange); font: 700 42px/1 Arial; }
.metric span { margin-top: 15px; color: var(--muted); font-size: 14px; }

.contact { padding-top: 0; }
.contact-box { min-height: 280px; padding: 56px 64px; display: flex; align-items: center; justify-content: space-between; gap: 60px; color: #fff; background: var(--orange); }
.contact-box h2 { font-size: 38px; }
.contact-box p:last-child { margin-bottom: 0; color: rgba(255,255,255,.8); }
.btn-white { flex: 0 0 auto; color: var(--ink); background: #fff; }

.site-footer { padding: 72px 0 24px; color: #bbc0c4; background: #111418; }
.footer-main { display: grid; grid-template-columns: 1.7fr repeat(3,1fr); gap: 60px; }
.brand-light { color: #fff; }
.footer-brand p { max-width: 280px; margin-top: 22px; }
.footer-main h3 { margin: 3px 0 20px; color: #fff; font-size: 15px; }
.footer-main > div:not(.footer-brand) { display: flex; flex-direction: column; gap: 10px; font-size: 13px; }
.footer-main a:hover { color: #fff; }
.footer-bottom { margin-top: 58px; padding-top: 20px; display: flex; justify-content: space-between; border-top: 1px solid #30343a; font-size: 12px; }
.footer-bottom a { color: #fff; }
.footer-bottom a:hover { color: var(--orange); }
.back-top { position: fixed; z-index: 40; right: 24px; bottom: 24px; width: 44px; height: 44px; border: 0; border-radius: 4px; color: #fff; background: var(--orange); opacity: 0; pointer-events: none; transform: translateY(10px); transition: .2s; cursor: pointer; }
.back-top.visible { opacity: 1; pointer-events: auto; transform: none; }
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 920px) {
  .section { padding: 78px 0; }
  .main-nav { gap: 20px; }
  .solution-grid { grid-template-columns: repeat(2, 1fr); }
  .workflow-grid { gap: 55px; }
  .scenario-layout { grid-template-columns: 1fr; }
  .scenario-image { min-height: 430px; }
  .metrics-grid { grid-template-columns: 1fr repeat(3, .55fr); }
  .metric-intro, .metric { padding: 38px 22px; }
  .footer-main { grid-template-columns: 1.5fr repeat(3, 1fr); gap: 28px; }
}

@media (max-width: 720px) {
  .container, .nav-shell { width: min(100% - 32px, var(--max)); }
  .section { padding: 64px 0; }
  .nav-shell { height: 70px; }
  .menu-toggle { z-index: 2; display: block; color: #fff; }
  .site-header.scrolled .menu-toggle, .site-header.menu-open .menu-toggle { color: var(--ink); }
  .main-nav { position: absolute; top: 0; left: 0; width: 100%; padding: 88px 24px 28px; display: none; align-items: stretch; flex-direction: column; gap: 0; color: var(--ink); background: #fff; box-shadow: 0 12px 25px rgba(0,0,0,.12); }
  .site-header.menu-open .main-nav { display: flex; }
  .main-nav a { padding: 13px 0; border-bottom: 1px solid var(--line); }
  .main-nav .nav-cta { margin-top: 14px; padding: 12px 18px; text-align: center; color: #fff; background: var(--orange); border: 0; }
  .hero { min-height: 690px; height: 88vh; align-items: flex-end; padding-bottom: 146px; }
  .hero-bg { object-position: 62% center; }
  .hero-overlay { background: linear-gradient(90deg, rgba(10,13,17,.9), rgba(10,13,17,.58)); }
  .hero-content { padding-top: 0; }
  .hero h1 { font-size: 58px; }
  .hero-lead { margin-top: 18px; font-size: 23px; }
  .hero-desc { font-size: 15px; }
  .hero-actions { align-items: stretch; flex-direction: column; margin-top: 26px; }
  .btn { width: 100%; }
  .hero-proof { width: 100%; }
  .hero-proof div { padding: 18px 12px; }
  .hero-proof strong { font-size: 15px; }
  .hero-proof span { font-size: 10px; }
  .intro-grid, .workflow-grid { grid-template-columns: 1fr; gap: 28px; }
  h2 { font-size: 31px; }
  .intro { padding: 60px 0; }
  .section-head { align-items: start; flex-direction: column; gap: 12px; }
  .solution-grid { grid-template-columns: 1fr; }
  .solution-card { min-height: 290px; }
  .scenario-image { min-height: 300px; }
  .scenario-list article { min-height: 150px; padding: 28px 24px; }
  .metrics { padding-top: 0; }
  .metrics-grid { grid-template-columns: 1fr 1fr; }
  .metric-intro { grid-column: 1 / -1; padding-left: 0; }
  .metric { min-height: 160px; border-top: 1px solid var(--line); }
  .metric:nth-child(2) { border-left: 0; }
  .metric:last-child { grid-column: 1 / -1; border-left: 0; }
  .contact { padding-top: 0; }
  .contact-box { padding: 38px 28px; align-items: flex-start; flex-direction: column; gap: 28px; }
  .contact-box h2 { font-size: 30px; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { align-items: flex-start; flex-direction: column; gap: 6px; }
}

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