:root {
  --bg: #f8fafc;
  --bg-soft: #eef2ff;
  --surface: #ffffff;
  --surface-dark: #0f172a;
  --surface-card: rgba(15, 23, 42, 0.72);
  --ink: #0f172a;
  --ink-soft: #334155;
  --muted: #64748b;
  --line: rgba(15, 23, 42, 0.08);
  --accent: #2563eb;
  --accent-2: #06b6d4;
  --accent-warm: #f97316;
  --ok: #059669;
  --err: #dc2626;
  --radius: 20px;
  --radius-sm: 14px;
  --shadow: 0 24px 48px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 32px 64px rgba(15, 23, 42, 0.14);
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; }

button, input, select, textarea { font: inherit; color: inherit; }

h1, h2, h3, p { margin: 0; }

h1, h2, h3 { line-height: 1.15; font-weight: 700; letter-spacing: -0.02em; }

h1 { font-size: clamp(2.1rem, 6.5vw, 3.75rem); }

h2 { font-size: clamp(1.6rem, 3.2vw, 2.35rem); }

h3 { font-size: 1.12rem; }

.skip {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 50;
  background: #fff;
  padding: 8px 12px;
  border-radius: 8px;
}

.skip:focus { top: 12px; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.wrap {
  width: min(1140px, calc(100% - 32px));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  padding: 12px 0;
}

.header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  position: relative;
  min-height: 52px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  backdrop-filter: blur(16px);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
  line-height: 1;
}

.brand-name {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.brand-sep {
  width: 1px;
  height: 18px;
  background: rgba(15, 23, 42, 0.16);
}

.brand-sub {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav-toggle {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.nav-btn {
  width: 44px;
  height: 44px;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  margin-left: auto;
}

.nav-btn span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  border-radius: 99px;
}

.site-nav {
  display: none;
  width: 100%;
  flex-direction: column;
  gap: 4px;
  padding: 8px 0 4px;
}

.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  padding: 10px 6px;
  border-radius: 12px;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--ink);
  background: rgba(37, 99, 235, 0.08);
}

.site-nav .nav-cta {
  margin-top: 4px;
  text-align: center;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #1d4ed8);
}

.site-nav .nav-cta:hover,
.site-nav .nav-cta.is-active {
  color: #fff;
  background: linear-gradient(135deg, #1d4ed8, #1e40af);
}

#nav-toggle:checked ~ .site-nav { display: flex; }

/* Hero */
.hero {
  position: relative;
  padding: 28px 0 56px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    url("mesh.svg") center / cover no-repeat,
    linear-gradient(180deg, #eef2ff 0%, var(--bg) 72%);
  opacity: 0.95;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.lead {
  margin-top: 16px;
  max-width: 36em;
  color: var(--muted);
  font-size: 1.05rem;
}

.gradient-text {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s var(--ease);
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), #1d4ed8);
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.28);
}

.btn-primary:hover { box-shadow: 0 16px 32px rgba(37, 99, 235, 0.34); }

.btn-ghost {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.85);
  border-color: var(--line);
}

.btn-block { width: 100%; }

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.hero-tags li {
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.hero-visual {
  position: relative;
  min-height: 280px;
}

.orbit-card {
  position: relative;
  padding: 22px 20px;
  border-radius: 24px;
  color: #e2e8f0;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.08), transparent 40%),
    linear-gradient(160deg, #0f172a 0%, #1e293b 55%, #0c4a6e 100%);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.orbit-label {
  margin-bottom: 12px;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #94a3b8;
}

.orbit-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.orbit-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid rgba(148, 163, 184, 0.18);
  font-size: 0.95rem;
}

.orbit-list li:first-child { border-top: 0; padding-top: 0; }

.orbit-list span {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  font-size: 0.72rem;
  font-weight: 700;
  color: #bfdbfe;
  background: rgba(37, 99, 235, 0.22);
}

.float-chip {
  position: absolute;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  animation: float 5s ease-in-out infinite;
}

.chip-a { top: -8px; right: 8px; }

.chip-b { bottom: 12px; left: 0; animation-delay: -2s; }

/* Sections */
.section {
  padding: 72px 0;
  scroll-margin-top: 88px;
}

.section-soft { background: var(--bg-soft); }

.section-dark {
  color: #e2e8f0;
  background:
    radial-gradient(900px 420px at 10% -10%, rgba(37, 99, 235, 0.22), transparent 60%),
    radial-gradient(700px 380px at 100% 0%, rgba(6, 182, 212, 0.16), transparent 55%),
    linear-gradient(180deg, #0b1220 0%, #111827 100%);
}

.section-label {
  margin-bottom: 10px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.section-dark .section-label { color: #7dd3fc; }

.section-head {
  max-width: 40em;
  margin-bottom: 28px;
}

.section-head p {
  margin-top: 10px;
  color: var(--muted);
}

.section-dark .section-head p { color: #94a3b8; }

.about-shell {
  display: grid;
  gap: 20px;
}

.about-head h2 { margin-top: 8px; }

.about-body {
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
}

.about-body p {
  margin-top: 12px;
  color: var(--muted);
}

.about-lead {
  margin-top: 0;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.about-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}

.about-list li {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  padding: 18px 16px;
  border-top: 1px solid var(--line);
}

.about-list li:first-child { border-top: 0; }

.about-no {
  display: grid;
  place-items: center;
  align-self: start;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  background: rgba(37, 99, 235, 0.08);
}

.about-list h3 {
  margin-bottom: 6px;
  font-size: 1rem;
}

.about-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Services */
.services-top {
  display: grid;
  gap: 12px;
  margin-bottom: 28px;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.services-top h2 { margin-top: 8px; }

.services-top p {
  margin: 0;
  max-width: 34em;
  color: #94a3b8;
  font-size: 1.02rem;
}

.service-matrix {
  display: grid;
  gap: 14px;
}

.service-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 100%;
  padding: 22px 20px 18px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border: 1px solid rgba(148, 163, 184, 0.18);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.service-card:hover {
  transform: translateY(-3px);
  border-color: rgba(125, 211, 252, 0.42);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
}

.service-top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.service-card .num {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  font-size: 0.76rem;
  font-weight: 700;
  color: #bae6fd;
  background: rgba(37, 99, 235, 0.22);
}

.service-card h3 {
  margin: 0;
  font-size: 1.08rem;
}

.service-card .tagline {
  color: #e2e8f0;
  font-weight: 600;
  font-size: 0.92rem;
}

.service-desc {
  flex: 1;
  color: #94a3b8;
  font-size: 0.95rem;
}

.link-btn {
  margin-top: 8px;
  align-self: flex-start;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid rgba(125, 211, 252, 0.35);
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.12);
  color: #bae6fd;
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.link-btn:hover {
  background: rgba(37, 99, 235, 0.22);
  border-color: rgba(125, 211, 252, 0.55);
}

/* Metrics */
.metric-grid {
  display: grid;
  gap: 14px;
}

.metric {
  padding: 22px 20px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8) inset;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.metric:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.metric p {
  margin-top: 8px;
  color: var(--muted);
}

/* Timeline */
.timeline {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.timeline li {
  position: relative;
  padding: 18px 18px 18px 56px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--line);
}

.step-no {
  position: absolute;
  left: 16px;
  top: 18px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.timeline p {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Contact */
.contact-shell {
  display: grid;
  gap: 18px;
  padding: 24px 20px;
  border-radius: calc(var(--radius) + 4px);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
}

.contact-intro p {
  margin-top: 10px;
  color: var(--muted);
}

.pitch {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.pitch li {
  position: relative;
  margin-top: 10px;
  padding-left: 18px;
  color: var(--ink-soft);
}

.pitch li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.consult-panel form {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

input, select, textarea {
  width: 100%;
  min-height: 48px;
  padding: 11px 13px;
  border-radius: 12px;
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: #f8fafc;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: rgba(37, 99, 235, 0.45);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
  background: #fff;
}

textarea { min-height: 128px; resize: vertical; }

.form-note:empty { display: none; }

.form-note.err { color: var(--err); }

.form-note.ok { color: var(--ok); }

/* Footer */
.site-footer {
  margin-top: 8px;
  padding: 28px 0 36px;
  color: #cbd5e1;
  background: #0b1220;
}

.footer-top {
  display: grid;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.16);
}

.footer-brand strong { display: block; margin-bottom: 6px; }

.footer-brand p { color: #94a3b8; font-size: 0.92rem; }

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
}

.footer-links a {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 0.92rem;
}

.footer-links a:hover { color: #fff; }

.footer-bottom {
  display: grid;
  gap: 10px;
  padding-top: 18px;
  text-align: center;
}

.copyright {
  color: #64748b;
  font-size: 0.86rem;
}

.footer-icp {
  justify-self: center;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: #e2e8f0;
}

.footer-icp:hover { color: #fff; }

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.delay-1 { transition-delay: 0.08s; }

.delay-2 { transition-delay: 0.16s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@media (min-width: 720px) {
  .hero-actions { flex-direction: row; flex-wrap: wrap; }
  .service-matrix { grid-template-columns: repeat(2, 1fr); }
  .services-top { grid-template-columns: 1fr 1fr; align-items: end; }
  .metric-grid { grid-template-columns: repeat(3, 1fr); }
  .timeline { grid-template-columns: repeat(2, 1fr); }
  .contact-shell { grid-template-columns: 0.95fr 1.05fr; padding: 28px; }
}

@media (min-width: 960px) {
  .header-shell {
    flex-wrap: nowrap;
    padding-inline: 18px;
  }

  .nav-btn { display: none; }

  .site-nav {
    display: flex;
    flex-direction: row;
    align-items: center;
    width: auto;
    gap: 4px;
    padding: 0;
    margin-left: auto;
  }

  .site-nav .nav-cta {
    margin-top: 0;
    margin-left: 6px;
    padding: 8px 14px;
  }

  .hero { padding: 48px 0 72px; }

  .hero-inner {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 40px;
  }

  .about-shell {
    grid-template-columns: 220px 1fr;
    column-gap: 40px;
    row-gap: 24px;
  }

  .about-head { grid-column: 1; grid-row: 1; }

  .about-body {
    grid-column: 2;
    grid-row: 1;
    padding: 4px 0 0;
    border-top: 0;
  }

  .about-list {
    grid-column: 1 / -1;
    grid-template-columns: repeat(3, 1fr);
  }

  .about-list li {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 22px 20px;
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .about-list li:first-child { border-left: 0; }

  .service-matrix {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .timeline { grid-template-columns: repeat(4, 1fr); }

  .footer-top {
    grid-template-columns: 1fr auto;
    align-items: end;
  }

  .footer-links { justify-content: flex-end; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}