:root {
  --color-primary: #2563eb;
  --color-primary-deep: #1d4ed8;
  --color-accent: #f97316;
  --color-ink: #152033;
  --color-muted: #52627a;
  --color-soft: #eef4ff;
  --color-surface: #ffffff;
  --color-line: #dbe5f4;
  --color-bg: #f8fafc;
  --shadow-soft: 0 18px 48px rgba(27, 58, 112, 0.12);
  --shadow-panel: 0 24px 70px rgba(20, 39, 78, 0.18);
  --radius: 8px;
  --container: 1180px;
  --header-height: 72px;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--color-bg);
  color: var(--color-ink);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0;
}

body.nav-open {
  overflow: hidden;
}

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

button,
a {
  touch-action: manipulation;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(249, 115, 22, 0.78);
  outline-offset: 4px;
}

svg {
  display: block;
  width: 1.25rem;
  height: 1.25rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

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

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 2000;
  transform: translateY(-140%);
  padding: 10px 14px;
  border-radius: var(--radius);
  background: var(--color-ink);
  color: #fff;
  font-weight: 700;
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(100% - 40px, var(--container));
  margin: 0 auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(219, 229, 244, 0.78);
  backdrop-filter: blur(18px);
  transition: box-shadow 220ms ease, background-color 220ms ease;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 14px 36px rgba(38, 70, 120, 0.1);
}

.nav-shell {
  width: min(100% - 40px, var(--container));
  height: var(--header-height);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-ink);
  font-weight: 800;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), #38bdf8);
  color: #fff;
  font-size: 15px;
  box-shadow: 0 12px 26px rgba(37, 99, 235, 0.28);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 13px;
  border-radius: var(--radius);
  color: #334155;
  font-size: 15px;
  font-weight: 700;
  transition: background-color 180ms ease, color 180ms ease;
}

.nav-links a:hover,
.nav-links a.is-active {
  background: var(--color-soft);
  color: var(--color-primary-deep);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-ink);
  cursor: pointer;
}

.nav-toggle svg {
  margin: auto;
}

.hero {
  position: relative;
  min-height: 100dvh;
  padding: calc(var(--header-height) + 72px) 0 84px;
  display: grid;
  align-items: center;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 20%, rgba(59, 130, 246, 0.2), transparent 26rem),
    linear-gradient(135deg, #f8fbff 0%, #edf5ff 48%, #f9fbff 100%);
}

.hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 96px;
  background: linear-gradient(180deg, transparent, var(--color-bg));
  pointer-events: none;
}

.hero-canvas,
.hero-grid {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-canvas {
  z-index: 0;
  opacity: 0.9;
}

.hero-grid {
  z-index: 1;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.09) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(90deg, rgba(0, 0, 0, 0.18), rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.2));
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(100% - 40px, var(--container));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(320px, 0.72fr);
  gap: 56px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--color-primary-deep);
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.18;
}

h1 {
  max-width: 760px;
  font-size: clamp(2.35rem, 6vw, 4.85rem);
  font-weight: 900;
  color: #0f1b2d;
}

h2 {
  color: #172033;
  font-size: clamp(1.75rem, 3vw, 2.75rem);
  font-weight: 900;
}

h3 {
  color: #182236;
  font-size: 1.13rem;
  font-weight: 850;
}

.hero-lede {
  max-width: 700px;
  margin: 24px 0 0;
  color: #334155;
  font-size: 1.08rem;
  line-height: 1.86;
}

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

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 20px;
  border-radius: var(--radius);
  font-weight: 800;
  transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 15px 32px rgba(249, 115, 22, 0.28);
}

.button-primary:hover {
  background: #ea580c;
}

.button-secondary {
  border: 1px solid rgba(37, 99, 235, 0.34);
  background: rgba(255, 255, 255, 0.76);
  color: var(--color-primary-deep);
}

.button-secondary:hover {
  border-color: var(--color-primary);
  box-shadow: 0 12px 26px rgba(37, 99, 235, 0.14);
}

.hero-panel {
  display: grid;
  gap: 16px;
}

.signal-card,
.signal-item,
.feature-card,
.scenario-grid article,
.contact-card {
  border: 1px solid rgba(219, 229, 244, 0.95);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow-soft);
}

.signal-card-main {
  position: relative;
  padding: 28px;
  min-height: 246px;
  overflow: hidden;
  box-shadow: var(--shadow-panel);
}

.signal-card-main::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), #38bdf8, var(--color-accent));
}

.signal-kicker {
  display: inline-flex;
  margin-bottom: 28px;
  padding: 6px 10px;
  border-radius: var(--radius);
  background: var(--color-soft);
  color: var(--color-primary-deep);
  font-size: 12px;
  font-weight: 900;
}

.signal-card strong {
  display: block;
  color: #111827;
  font-size: 1.6rem;
  line-height: 1.25;
}

.signal-card p,
.feature-card p,
.scenario-grid p,
.capability-list p,
.section-heading p,
.about-band p,
.contact-card dd {
  color: var(--color-muted);
}

.signal-card p {
  margin: 16px 0 0;
}

.signal-list {
  display: grid;
  gap: 12px;
}

.signal-item {
  min-height: 68px;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.signal-item span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 7px rgba(37, 99, 235, 0.12);
}

.signal-item p {
  margin: 0;
  color: #243149;
  font-weight: 800;
}

.section {
  padding: 96px 0;
  background: var(--color-bg);
}

.section-light {
  background: #fff;
}

.section-blue {
  background:
    linear-gradient(180deg, rgba(14, 53, 118, 0.94), rgba(20, 59, 124, 0.96)),
    linear-gradient(135deg, #123a84, #2563eb);
  color: #fff;
}

.section-heading {
  max-width: 780px;
  margin-bottom: 40px;
}

.section-heading.compact {
  max-width: 520px;
  margin-bottom: 0;
}

.section-heading p {
  margin: 14px 0 0;
  font-size: 1rem;
}

.section-blue .eyebrow,
.section-blue h2,
.section-blue .section-heading p {
  color: #fff;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  min-height: 288px;
  padding: 26px;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: 0 18px 44px rgba(27, 58, 112, 0.16);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  margin-bottom: 24px;
  border-radius: var(--radius);
  background: var(--color-soft);
  color: var(--color-primary-deep);
}

.feature-icon svg {
  width: 26px;
  height: 26px;
}

.feature-card p {
  margin: 14px 0 0;
}

.split-layout,
.contact-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.72fr) minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

.capability-list {
  display: grid;
  gap: 12px;
}

.capability-list article {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--color-line);
}

.capability-list article:first-child {
  padding-top: 0;
}

.capability-list span {
  color: var(--color-primary);
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}

.capability-list p {
  margin: 8px 0 0;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.scenario-grid article {
  min-height: 218px;
  padding: 26px;
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.22);
  box-shadow: none;
}

.scenario-grid h3,
.scenario-grid p {
  color: #fff;
}

.scenario-grid p {
  margin: 14px 0 0;
  opacity: 0.84;
}

.about-band {
  display: grid;
  grid-template-columns: minmax(260px, 0.54fr) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

.about-band p {
  margin: 0;
  font-size: 1.05rem;
}

.contact-section {
  padding-bottom: 112px;
  background:
    linear-gradient(180deg, #f8fafc 0%, #eef5ff 100%);
}

.contact-card {
  padding: 30px;
}

.contact-email {
  display: inline-flex;
  max-width: 100%;
  margin-bottom: 26px;
  color: var(--color-primary-deep);
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 900;
  overflow-wrap: anywhere;
}

.contact-card dl {
  display: grid;
  gap: 0;
  margin: 0;
}

.contact-card div {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--color-line);
}

.contact-card dt {
  color: #1f2a44;
  font-weight: 900;
}

.contact-card dd {
  margin: 0;
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 900;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: 50%;
  background: #fff;
  color: var(--color-primary-deep);
  box-shadow: 0 14px 34px rgba(27, 58, 112, 0.18);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.site-footer {
  background: #111827;
  color: #cbd5e1;
}

.footer-inner {
  min-height: 96px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0;
}

.footer-inner p {
  margin: 0;
}

.footer-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 16px;
}

.footer-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: #e5e7eb;
  font-weight: 700;
}

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

@media (max-width: 1040px) {
  .hero-content,
  .split-layout,
  .contact-layout,
  .about-band {
    grid-template-columns: 1fr;
  }

  .hero-content {
    gap: 38px;
  }

  .hero-panel {
    max-width: 640px;
  }

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

  .section-heading.compact {
    max-width: 760px;
    margin-bottom: 34px;
  }
}

@media (max-width: 760px) {
  :root {
    --header-height: 66px;
  }

  .container,
  .nav-shell,
  .hero-content {
    width: min(100% - 32px, var(--container));
  }

  .brand {
    max-width: calc(100vw - 92px);
    font-size: 14px;
    line-height: 1.3;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .nav-toggle {
    display: grid;
    place-items: center;
    flex: 0 0 auto;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    display: grid;
    gap: 4px;
    padding: 14px 16px 18px;
    background: #fff;
    border-bottom: 1px solid var(--color-line);
    box-shadow: 0 18px 42px rgba(27, 58, 112, 0.14);
    transform: translateY(-120%);
    visibility: hidden;
    transition: transform 220ms ease, visibility 220ms ease;
  }

  .nav-links.is-open {
    transform: translateY(0);
    visibility: visible;
  }

  .nav-links a {
    justify-content: center;
    min-height: 48px;
  }

  .hero {
    min-height: auto;
    padding: calc(var(--header-height) + 56px) 0 68px;
  }

  .hero-grid {
    background-size: 44px 44px;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .signal-card-main {
    min-height: auto;
    padding: 24px;
  }

  .section {
    padding: 72px 0;
  }

  .feature-grid,
  .scenario-grid {
    grid-template-columns: 1fr;
  }

  .feature-card,
  .scenario-grid article {
    min-height: auto;
  }

  .capability-list article {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 14px;
  }

  .contact-card {
    padding: 24px;
  }

  .contact-card div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

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

@media (max-width: 420px) {
  .brand span:last-child {
    max-width: 220px;
  }

  h1 {
    font-size: 2.18rem;
  }

  .hero-lede {
    font-size: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}