:root {
  --ink: #1e293b;
  --muted: #64748b;
  --navy: #0a1628;
  --blue: #1e3a8a;
  --accent: #4a5bff;
  --violet: #7b3ff2;
  --soft: #f8fafc;
  --line: rgba(30, 58, 138, 0.14);
  --shadow: 0 20px 55px rgba(10, 22, 40, 0.12);
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: 72px;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 0 clamp(20px, 5vw, 72px);
  color: #fff;
  background: rgba(10, 22, 40, 0.72);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: max-content;
  font-weight: 900;
}

.brand-mark {
  position: relative;
  width: 42px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--violet));
  box-shadow: 0 12px 28px rgba(74, 91, 255, 0.35);
  overflow: hidden;
}

.brand-mark span {
  position: absolute;
  height: 3px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
}

.brand-mark span:nth-child(1) {
  width: 24px;
  left: 8px;
  top: 11px;
}

.brand-mark span:nth-child(2) {
  width: 18px;
  left: 14px;
  top: 18px;
}

.brand-mark span:nth-child(3) {
  width: 8px;
  height: 8px;
  right: 7px;
  bottom: 7px;
}

.brand-text {
  font-size: 20px;
  letter-spacing: 0;
}

.nav-menu {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(18px, 3vw, 38px);
  flex: 1;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.84);
}

.nav-menu a {
  position: relative;
  transition: color 260ms var(--ease);
}

.nav-menu a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 2px;
  transform: scaleX(0);
  transform-origin: center;
  background: linear-gradient(90deg, var(--accent), var(--violet));
  transition: transform 260ms var(--ease);
}

.nav-menu a:hover {
  color: #fff;
}

.nav-menu a:hover::after {
  transform: scaleX(1);
}

.header-cta,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 8px;
  min-height: 46px;
  padding: 0 22px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 260ms var(--ease), box-shadow 260ms var(--ease), border-color 260ms var(--ease), background 260ms var(--ease);
}

.header-cta,
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--violet));
  box-shadow: 0 16px 34px rgba(74, 91, 255, 0.32);
}

.btn-secondary {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.32);
  background: rgba(255, 255, 255, 0.08);
}

.btn-secondary.light {
  background: rgba(255, 255, 255, 0.1);
}

.header-cta:hover,
.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 46px rgba(74, 91, 255, 0.36);
}

.header-cta:active,
.btn:active {
  transform: scale(0.98);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  background: transparent;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  border-radius: 999px;
  background: #fff;
}

.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.72fr);
  align-items: center;
  gap: clamp(34px, 5vw, 78px);
  padding: 120px clamp(20px, 6vw, 86px) 70px;
  color: #fff;
  overflow: hidden;
  background:
    radial-gradient(circle at 18% 24%, rgba(74, 91, 255, 0.34), transparent 30%),
    radial-gradient(circle at 72% 22%, rgba(123, 63, 242, 0.28), transparent 32%),
    linear-gradient(135deg, #0a1628 0%, #1e3a8a 55%, #4a5bff 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(90deg, rgba(10, 22, 40, 0.86) 0%, rgba(10, 22, 40, 0.66) 38%, rgba(30, 58, 138, 0.34) 100%),
    linear-gradient(180deg, rgba(10, 22, 40, 0.16), rgba(74, 91, 255, 0.12));
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  z-index: 1;
  height: 18vh;
  background: linear-gradient(180deg, transparent, rgba(10, 22, 40, 0.18));
  pointer-events: none;
}

.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.9;
  filter: saturate(1.12) contrast(1.12) brightness(0.82);
}

.hero-grid {
  position: absolute;
  inset: 0;
  z-index: 1;
  opacity: 0.18;
  background-image:
    linear-gradient(rgba(255,255,255,0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.16) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, black, transparent 88%);
}

.hero-orbit {
  position: absolute;
  z-index: 1;
  right: -130px;
  top: 120px;
  width: 520px;
  height: 520px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
}

.hero-orbit::before,
.hero-orbit::after {
  content: "";
  position: absolute;
  border-radius: 50%;
}

.hero-orbit::before {
  inset: 70px;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-orbit::after {
  width: 12px;
  height: 12px;
  top: 108px;
  left: 96px;
  background: #9cc7ff;
  box-shadow: 0 0 28px #9cc7ff;
}

.hero-content,
.hero-panel {
  position: relative;
  z-index: 2;
}

.eyebrow {
  margin: 0 0 16px;
  color: #4a5bff;
  font-size: 14px;
  font-weight: 900;
  text-transform: uppercase;
}

.hero .eyebrow,
.section-dark .eyebrow {
  color: #9cc7ff;
}

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

h1 {
  max-width: 790px;
  margin-bottom: 24px;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.08;
  letter-spacing: 0;
  font-weight: 900;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.18;
  letter-spacing: 0;
  font-weight: 900;
}

h3 {
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.25;
  letter-spacing: 0;
}

.hero-subtitle {
  max-width: 700px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-panel {
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(18px);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.24);
}

.panel-line {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
}

.panel-line span {
  color: #9cc7ff;
}

.panel-line strong {
  font-size: 20px;
}

.signal-map {
  position: relative;
  height: 220px;
  margin: 18px 0;
  border-radius: 8px;
  overflow: hidden;
  background:
    linear-gradient(120deg, rgba(74, 91, 255, 0.22), rgba(123, 63, 242, 0.12)),
    repeating-linear-gradient(0deg, transparent 0 26px, rgba(255,255,255,0.08) 27px);
}

.signal-map::before {
  content: "";
  position: absolute;
  left: 10%;
  right: 8%;
  top: 50%;
  height: 2px;
  background: linear-gradient(90deg, transparent, #9cc7ff, transparent);
}

.signal-map span {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 24px #9cc7ff;
}

.signal-map span:nth-child(1) { left: 18%; top: 30%; }
.signal-map span:nth-child(2) { left: 36%; top: 58%; }
.signal-map span:nth-child(3) { left: 54%; top: 38%; }
.signal-map span:nth-child(4) { left: 70%; top: 64%; }
.signal-map span:nth-child(5) { left: 84%; top: 28%; }

.panel-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.panel-stats div {
  padding: 16px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
}

.panel-stats strong {
  display: block;
  font-size: 22px;
}

.panel-stats span {
  color: rgba(255, 255, 255, 0.7);
  font-size: 13px;
}

.section-pad {
  padding: clamp(72px, 9vw, 118px) clamp(20px, 6vw, 86px);
}

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

.section-dark {
  color: #fff;
  background:
    radial-gradient(circle at 16% 20%, rgba(74, 91, 255, 0.22), transparent 28%),
    linear-gradient(145deg, #0a1628, #101f3a 60%, #172554);
}

.section-head,
.section-banner {
  max-width: 820px;
  margin: 0 auto 44px;
  text-align: center;
}

.section-head p,
.section-banner p {
  color: var(--muted);
}

.section-dark .section-head p,
.section-dark .section-banner p {
  color: rgba(255, 255, 255, 0.72);
}

.value-grid,
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.value-card,
.case-card,
.contact-info,
.contact-form,
.timeline,
.about-copy {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
  transition: transform 300ms var(--ease), box-shadow 300ms var(--ease), border-color 300ms var(--ease);
}

.value-card {
  padding: 30px;
}

.value-card:hover,
.case-card:hover {
  transform: translateY(-4px) perspective(900px) rotateX(2deg);
  border-color: rgba(74, 91, 255, 0.38);
  box-shadow: 0 24px 70px rgba(30, 58, 138, 0.18);
}

.icon-wrap {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  margin-bottom: 22px;
  color: #fff;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--violet));
  font-weight: 900;
}

.value-card p,
.about-copy p,
.timeline p,
.service-panel p,
.case-body p,
.contact-info p,
.faq p {
  color: var(--muted);
}

.about-layout,
.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 28px;
  align-items: stretch;
}

.about-copy,
.timeline {
  padding: 34px;
}

.text-link {
  display: inline-flex;
  margin-top: 12px;
  color: var(--accent);
  font-weight: 800;
}

.timeline {
  display: grid;
  gap: 20px;
}

.timeline-item {
  position: relative;
  padding-left: 28px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 7px rgba(74, 91, 255, 0.12);
}

.timeline-item span {
  display: block;
  margin-bottom: 4px;
  font-weight: 900;
  color: var(--navy);
}

.service-tabs,
.case-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.tab-btn,
.filter-btn {
  min-height: 44px;
  padding: 0 20px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  transition: all 260ms var(--ease);
}

.tab-btn.active,
.filter-btn.active {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent), var(--violet));
}

.service-panel {
  display: none;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 0.8fr);
  gap: 32px;
  align-items: center;
  padding: clamp(28px, 5vw, 48px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(248,250,252,0.96), #fff);
  box-shadow: var(--shadow);
}

.service-panel.active {
  display: grid;
}

.feature-list {
  display: grid;
  gap: 10px;
  margin: 24px 0 28px;
  padding: 0;
  list-style: none;
}

.feature-list li {
  position: relative;
  padding-left: 22px;
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.tech-wall {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.tech-wall span {
  min-height: 72px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(74, 91, 255, 0.18);
  border-radius: 8px;
  color: var(--blue);
  background: rgba(255, 255, 255, 0.72);
  font-weight: 900;
}

.process-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  margin-top: 26px;
}

.process-strip span {
  min-height: 58px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: var(--blue);
  background: var(--soft);
  font-weight: 800;
}

.case-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.case-card {
  overflow: hidden;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.94);
}

.case-card.is-hidden {
  display: none;
}

.case-visual {
  min-height: 180px;
  background-size: cover;
  background-position: center;
}

.visual-a {
  background:
    linear-gradient(135deg, rgba(74,91,255,0.72), rgba(10,22,40,0.42)),
    linear-gradient(90deg, transparent 20%, rgba(255,255,255,0.26) 21% 22%, transparent 23%),
    repeating-linear-gradient(0deg, #203b78 0 16px, #27499a 17px 32px);
}

.visual-b {
  background:
    radial-gradient(circle at 50% 38%, rgba(255,255,255,0.65), transparent 14%),
    radial-gradient(circle at 50% 40%, rgba(123,63,242,0.78), transparent 34%),
    linear-gradient(135deg, #0a1628, #4a5bff);
}

.visual-c {
  background:
    linear-gradient(135deg, rgba(10,22,40,0.46), rgba(74,91,255,0.4)),
    repeating-linear-gradient(45deg, #172554 0 16px, #1e3a8a 17px 32px);
}

.visual-d {
  background:
    linear-gradient(135deg, rgba(74,91,255,0.55), rgba(123,63,242,0.45)),
    linear-gradient(90deg, #0a1628 0 18%, transparent 18% 22%, #1e3a8a 22% 42%, transparent 42% 48%, #334db5 48%);
}

.case-body {
  padding: 24px;
}

.case-body span {
  color: var(--accent);
  font-size: 14px;
  font-weight: 900;
}

.case-body h3 {
  margin: 8px 0 10px;
  font-size: 22px;
}

.center-action {
  margin-top: 36px;
  text-align: center;
}

.contact-info,
.contact-form {
  padding: 34px;
}

.mail-link {
  display: inline-flex;
  margin: 8px 0 22px;
  color: var(--accent);
  font-size: 24px;
  font-weight: 900;
  overflow-wrap: anywhere;
}

.map-placeholder {
  min-height: 220px;
  display: grid;
  place-content: center;
  margin-top: 28px;
  border: 1px solid rgba(74, 91, 255, 0.18);
  border-radius: 8px;
  color: #fff;
  text-align: center;
  background:
    radial-gradient(circle at 50% 45%, rgba(255,255,255,0.35), transparent 12%),
    linear-gradient(135deg, var(--navy), var(--blue), var(--accent));
}

.map-placeholder span {
  color: rgba(255, 255, 255, 0.72);
}

.form-row {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.form-row.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

label {
  font-weight: 800;
}

input,
select,
textarea {
  width: 100%;
  min-height: 48px;
  padding: 11px 13px;
  color: var(--ink);
  border: 1px solid rgba(30, 58, 138, 0.18);
  border-radius: 8px;
  outline: 0;
  background: #fff;
  transition: border-color 220ms var(--ease), box-shadow 220ms var(--ease);
}

textarea {
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(74, 91, 255, 0.12);
}

.form-row.error input,
.form-row.error select,
.form-row.error textarea {
  border-color: #dc2626;
}

.form-row small {
  min-height: 18px;
  color: #dc2626;
  font-size: 13px;
}

.form-submit {
  width: 100%;
}

.form-status {
  min-height: 24px;
  margin: 16px 0 0;
  color: var(--blue);
  font-weight: 800;
}

.faq {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

summary {
  min-height: 56px;
  display: flex;
  align-items: center;
  padding: 0 20px;
  cursor: pointer;
  font-weight: 900;
}

details p {
  padding: 0 20px 18px;
}

.site-footer {
  padding: 56px clamp(20px, 6vw, 86px) 26px;
  color: rgba(255, 255, 255, 0.72);
  background: var(--navy);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1fr;
  gap: 36px;
}

.footer-brand {
  color: #fff;
}

.footer-grid h3 {
  color: #fff;
  font-size: 18px;
}

.footer-grid a {
  display: block;
  margin-bottom: 10px;
  transition: color 220ms var(--ease);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 14px;
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 600ms var(--ease), transform 600ms var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1023px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-panel {
    max-width: 680px;
  }

  .value-grid,
  .case-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .service-panel,
  .about-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .process-strip {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 767px) {
  .site-header {
    height: 66px;
    padding: 0 18px;
  }

  .brand-text {
    font-size: 18px;
  }

  .nav-menu {
    position: fixed;
    top: 66px;
    right: 14px;
    left: 14px;
    display: grid;
    justify-content: stretch;
    gap: 0;
    padding: 12px;
    color: var(--ink);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow);
    transform: translateY(-14px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 240ms var(--ease), transform 240ms var(--ease);
  }

  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-menu a {
    padding: 13px 12px;
  }

  .nav-menu a::after {
    display: none;
  }

  .header-cta {
    display: none;
  }

  .menu-toggle {
    display: block;
    margin-left: auto;
  }

  .hero {
    padding-top: 112px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-actions,
  .hero-actions .btn {
    width: 100%;
  }

  .panel-stats,
  .value-grid,
  .case-grid,
  .footer-grid,
  .form-row.two-col,
  .tech-wall,
  .process-strip {
    grid-template-columns: 1fr;
  }

  .service-tabs,
  .case-filters {
    justify-content: stretch;
  }

  .tab-btn,
  .filter-btn {
    flex: 1 1 42%;
  }

  .mail-link {
    font-size: 20px;
  }

  .footer-bottom {
    flex-direction: column;
  }

  .value-card:hover,
  .case-card:hover {
    transform: translateY(-3px);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }

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