:root {
  --ink: #071019;
  --ink-deep: #04080d;
  --ink-soft: #0d1a24;
  --paper: #edf5f6;
  --muted: #a7b9be;
  --signal: #54e7ff;
  --signal-dim: rgba(84, 231, 255, 0.26);
  --stable: #78e0b1;
  --amber: #ffc86a;
  --line: rgba(190, 227, 232, 0.16);
  --shell: min(1240px, calc(100% - 56px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--paper);
  background: var(--ink-deep);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.shell { width: var(--shell); margin: 0 auto; }
.company-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(4, 8, 13, .88);
  backdrop-filter: blur(18px);
}
.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; min-width: 240px; }
.brand-mark { width: 38px; height: 38px; border: 1px solid var(--signal-dim); border-radius: 10px; object-fit: contain; padding: 5px; background: #0a1d29; }
.brand-copy strong { display: block; font-size: .98rem; letter-spacing: .08em; }
.brand-copy span { display: block; color: var(--signal); font-size: .62rem; letter-spacing: .16em; text-transform: uppercase; }
.nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 6px; }
.nav-links a { color: var(--muted); padding: 7px 12px; font-size: .88rem; border: 1px solid transparent; transition: color .2s, border-color .2s, background .2s; }
.nav-links a:hover, .nav-links a:focus-visible, .nav-links a.active { color: var(--paper); border-color: var(--signal-dim); background: rgba(84,231,255,.08); outline: none; }
.nav-cta { color: var(--ink) !important; background: var(--signal); border-color: var(--signal) !important; font-weight: 700; }
.menu-button { display: none; color: var(--paper); background: transparent; border: 1px solid var(--line); padding: 8px 10px; cursor: pointer; }

.company-hero { position: relative; min-height: min(760px, calc(100vh - 76px)); display: grid; align-items: center; overflow: hidden; }
.hero-photo { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .24; filter: saturate(.7) contrast(1.15); }
.hero-scrim { position: absolute; inset: 0; background: rgba(4,8,13,.78); }
.hero-route { position: absolute; inset: 0; opacity: .7; pointer-events: none; }
.hero-route path { fill: none; stroke: var(--signal); stroke-width: 1.1; stroke-dasharray: 4 10; animation: routeFlow 14s linear infinite; }
@keyframes routeFlow { to { stroke-dashoffset: -240; } }
.hero-content { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr); gap: 70px; align-items: end; padding: 92px 0 84px; }
.hero-kicker { color: var(--signal); font-size: .72rem; letter-spacing: .22em; text-transform: uppercase; }
.hero-title { max-width: 760px; margin: 20px 0 22px; font-size: clamp(2.8rem, 6vw, 6.8rem); line-height: 1.02; letter-spacing: -.02em; font-weight: 650; }
.hero-title em { color: var(--signal); font-style: normal; }
.hero-lead { max-width: 690px; color: #c3d1d4; font-size: clamp(1rem, 1.65vw, 1.2rem); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 18px; border: 1px solid var(--signal); color: var(--ink); background: var(--signal); font-weight: 700; transition: transform .2s, box-shadow .2s, background .2s; }
.button:hover, .button:focus-visible { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(84,231,255,.2); outline: none; }
.button-quiet { color: var(--paper); background: transparent; border-color: var(--line); }
.hero-aside { border-top: 1px solid var(--line); padding-top: 18px; }
.hero-aside-logo { width: 152px; height: 150px; object-fit: contain; object-position: left center; background: transparent; padding: 0; margin-bottom: 24px; }
.hero-stat { display: flex; align-items: baseline; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.hero-stat strong { color: var(--signal); font-size: 3.5rem; line-height: 1; font-weight: 650; }
.hero-stat span { color: var(--muted); font-size: .9rem; }
.hero-note { margin-top: 20px; color: var(--muted); font-size: .86rem; }

.section { padding: 110px 0; position: relative; }
.section-heading { display: grid; grid-template-columns: minmax(0, .65fr) minmax(0, 1.35fr); gap: 40px; margin-bottom: 52px; align-items: end; }
.section-label { color: var(--signal); font-size: .72rem; letter-spacing: .2em; text-transform: uppercase; }
h2 { margin: 0; font-size: clamp(2rem, 4vw, 4.2rem); line-height: 1.08; letter-spacing: -.02em; font-weight: 620; }
.section-intro { max-width: 650px; margin: 14px 0 0; color: var(--muted); font-size: 1.05rem; }
.services { background: var(--ink); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.service-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.service-item { display: grid; grid-template-columns: 84px minmax(0, 1fr); gap: 22px; padding: 30px 28px 32px 0; border-bottom: 1px solid var(--line); }
.service-item:nth-child(odd) { padding-right: 38px; border-right: 1px solid var(--line); }
.service-item:nth-child(even) { padding-left: 38px; }
.service-code { color: var(--amber); font-size: .72rem; letter-spacing: .18em; padding-top: 6px; }
.service-copy h3, .case-body h3 { margin: 0 0 10px; font-size: 1.25rem; line-height: 1.25; }
.service-copy p, .case-body > p { color: var(--muted); margin: 0; font-size: .94rem; }
.service-item ul { grid-column: 2; display: flex; gap: 8px; flex-wrap: wrap; padding: 0; margin: 0; list-style: none; }
.service-item li { color: #d9e6e8; font-size: .78rem; border-bottom: 1px solid var(--signal-dim); padding-bottom: 2px; }

.cases { background: #08131b; }
.filter-bar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 28px; }
.filter { color: var(--muted); border: 1px solid var(--line); background: transparent; padding: 8px 14px; cursor: pointer; }
.filter:hover, .filter:focus-visible, .filter.active { color: var(--ink); border-color: var(--signal); background: var(--signal); outline: none; }
.case-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.case-item { display: grid; grid-template-columns: 42% minmax(0, 1fr); min-height: 292px; border: 1px solid var(--line); background: #0c1c26; transition: border-color .25s, transform .25s; }
.case-item:hover { border-color: var(--signal-dim); transform: translateY(-3px); }
.case-media { position: relative; min-height: 100%; margin: 0; overflow: hidden; background: #071019; }
.case-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7,16,25,.08), rgba(7,16,25,.68)); }
.case-media img { width: 100%; height: 100%; object-fit: cover; opacity: .72; filter: saturate(.76) contrast(1.1); }
.case-media figcaption { position: absolute; left: 16px; bottom: 14px; z-index: 1; color: var(--paper); font-size: .74rem; letter-spacing: .08em; }
.case-body { padding: 24px 24px 20px; display: flex; flex-direction: column; min-width: 0; }
.case-client { color: var(--signal) !important; font-size: .76rem !important; letter-spacing: .1em; text-transform: uppercase; }
.case-tags { display: flex; gap: 7px; flex-wrap: wrap; margin-top: 18px; }
.case-tags span { color: var(--stable); font-size: .72rem; border: 1px solid rgba(120,224,177,.34); padding: 3px 7px; }
.case-proof { margin-top: auto !important; padding-top: 18px; color: #82979c !important; font-size: .72rem !important; }

.method { background: var(--paper); color: var(--ink); }
.method .section-label { color: #087b91; }
.method .section-intro { color: #46636a; }
.method-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); border-top: 1px solid rgba(7,16,25,.28); border-bottom: 1px solid rgba(7,16,25,.28); }
.method-step { padding: 24px 20px 26px 0; border-right: 1px solid rgba(7,16,25,.2); }
.method-step + .method-step { padding-left: 20px; }
.method-step:last-child { border-right: 0; }
.method-step strong { display: block; color: #087b91; font-size: .8rem; letter-spacing: .12em; }
.method-step h3 { margin: 36px 0 10px; font-size: 1.28rem; line-height: 1.25; }
.method-step p { margin: 0; color: #46636a; font-size: .9rem; }
.contact-band { padding: 90px 0; background: #061018; border-top: 1px solid var(--line); }
.contact-inner { display: flex; align-items: end; justify-content: space-between; gap: 28px; }
.contact-inner h2 { max-width: 720px; }
.contact-inner p { color: var(--muted); max-width: 580px; margin: 16px 0 0; }
.company-footer { padding: 26px 0 34px; background: #04080d; color: #80949a; border-top: 1px solid var(--line); font-size: .78rem; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.footer-links { display: flex; gap: 16px; }
.footer-links a:hover { color: var(--signal); }
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .65s ease, transform .65s ease; }
.reveal.revealed { opacity: 1; transform: none; }

@media (max-width: 900px) {
  :root { --shell: min(100% - 36px, 720px); }
  .header-inner { min-height: 64px; }
  .brand { min-width: 0; }
  .menu-button { display: inline-flex; }
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; padding: 12px 18px 18px; flex-direction: column; align-items: stretch; background: rgba(4,8,13,.98); border-bottom: 1px solid var(--line); }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 12px; }
  .company-hero { min-height: auto; }
  .hero-content { grid-template-columns: 1fr; gap: 50px; padding: 74px 0 70px; }
  .hero-aside { max-width: 500px; }
  .section { padding: 76px 0; }
  .section-heading { grid-template-columns: 1fr; gap: 16px; margin-bottom: 34px; }
  .case-grid { grid-template-columns: 1fr; }
  .method-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .method-step:nth-child(2) { border-right: 0; }
  .method-step:nth-child(-n+2) { border-bottom: 1px solid rgba(7,16,25,.2); }
  .contact-inner { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 620px) {
  :root { --shell: calc(100% - 28px); }
  .brand-copy strong { font-size: .86rem; letter-spacing: .04em; }
  .brand-copy span { font-size: .52rem; }
  .hero-title { font-size: clamp(2.45rem, 14vw, 4.4rem); }
  .hero-lead { font-size: .96rem; }
  .service-grid { grid-template-columns: 1fr; }
  .service-item, .service-item:nth-child(odd), .service-item:nth-child(even) { grid-template-columns: 62px minmax(0,1fr); padding: 24px 0; border-right: 0; }
  .service-item ul { grid-column: 2; }
  .case-item { grid-template-columns: 1fr; }
  .case-media { min-height: 180px; max-height: 230px; }
  .method-grid { grid-template-columns: 1fr; }
  .method-step, .method-step + .method-step, .method-step:nth-child(2) { padding: 22px 0; border-right: 0; border-bottom: 1px solid rgba(7,16,25,.2); }
  .method-step:last-child { border-bottom: 0; }
  .footer-inner { align-items: flex-start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}