:root {
  --ink: #0b1220;
  --muted: #5f6f86;
  --line: rgba(15, 34, 62, 0.12);
  --panel: rgba(255, 255, 255, 0.86);
  --blue: #1769ff;
  --cyan: #10c8e8;
  --green: #18b981;
  --amber: #f5a524;
  --deep: #07111f;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(8, 22, 48, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  background:
    linear-gradient(180deg, #f6fbff 0%, #ffffff 42%, #f2f7fb 100%);
}

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

button,
input,
textarea {
  font: inherit;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 18px clamp(20px, 5vw, 72px);
  color: var(--white);
  transition: background 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 40px rgba(8, 22, 48, 0.08);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 230px;
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.38);
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: var(--white);
  font-weight: 800;
  letter-spacing: 0;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 16px;
  font-weight: 800;
}

.brand small {
  margin-top: 2px;
  font-size: 10px;
  color: currentColor;
  opacity: 0.72;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
  font-size: 15px;
  font-weight: 600;
}

.site-nav a {
  opacity: 0.78;
}

.site-nav a:hover {
  opacity: 1;
}

.nav-action,
.primary-button,
.secondary-button,
.contact-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 46px;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
}

.nav-action {
  padding: 0 18px;
  color: var(--white);
  background: linear-gradient(135deg, var(--blue), var(--cyan));
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 8px;
  color: currentColor;
  background: transparent;
}

.hero {
  position: relative;
  display: grid;
  min-height: 92vh;
  padding: 150px clamp(20px, 5vw, 72px) 56px;
  overflow: hidden;
  color: var(--white);
  background: var(--deep);
}

.hero-canvas,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-canvas {
  width: 100%;
  height: 100%;
}

.hero-shade {
  background:
    radial-gradient(circle at 82% 30%, rgba(16, 200, 232, 0.34), transparent 32%),
    radial-gradient(circle at 24% 22%, rgba(23, 105, 255, 0.34), transparent 28%),
    linear-gradient(90deg, rgba(7, 17, 31, 0.94), rgba(7, 17, 31, 0.68) 48%, rgba(7, 17, 31, 0.28));
}

.hero-content {
  position: relative;
  z-index: 1;
  align-self: center;
  max-width: 790px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
}

.hero h1,
.section-heading h2,
.contact-section h2 {
  margin: 0;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 800px;
  font-size: clamp(42px, 6vw, 82px);
  line-height: 1.08;
  font-weight: 800;
}

.hero-copy {
  max-width: 680px;
  margin: 26px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
}

.primary-button,
.secondary-button {
  padding: 0 24px;
}

.primary-button {
  color: var(--white);
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  box-shadow: 0 18px 44px rgba(16, 133, 255, 0.28);
}

.secondary-button {
  border: 1px solid rgba(255, 255, 255, 0.24);
  color: var(--white);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
}

.hero-panel {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  align-self: end;
  width: min(760px, 100%);
  margin-top: 80px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(16px);
}

.hero-panel div {
  padding: 24px;
  background: rgba(255, 255, 255, 0.08);
}

.hero-panel strong {
  display: block;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1;
}

.hero-panel span {
  display: block;
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.68);
  font-size: 14px;
}

.section {
  padding: 96px clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 940px;
  margin-bottom: 42px;
}

.section-heading h2,
.contact-section h2 {
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.16;
}

.section-heading.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 0.72fr);
  gap: 46px;
  align-items: end;
  max-width: none;
}

.section-heading.split > p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.9;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
  gap: 18px;
}

.about-card {
  min-height: 280px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 18px 50px rgba(15, 35, 66, 0.08);
}

.about-card.wide {
  background:
    linear-gradient(135deg, rgba(23, 105, 255, 0.1), rgba(24, 185, 129, 0.1)),
    var(--white);
}

.card-icon,
.proof-band span {
  display: inline-grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border-radius: 8px;
  color: var(--blue);
  background: rgba(23, 105, 255, 0.1);
}

.about-card h3,
.service-item h3 {
  margin: 24px 0 12px;
  font-size: 22px;
}

.about-card p,
.service-item p,
.timeline p,
.contact-section p {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
}

.services-section {
  background: #f5f9fc;
}

.service-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.service-item {
  display: flex;
  min-height: 310px;
  gap: 24px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 50px rgba(15, 35, 66, 0.07);
}

.service-item > span {
  color: var(--cyan);
  font-size: 14px;
  font-weight: 800;
}

.proof-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  color: var(--white);
  background:
    linear-gradient(135deg, rgba(23, 105, 255, 0.94), rgba(7, 17, 31, 0.94)),
    var(--deep);
}

.proof-band div {
  padding: 46px clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.04);
}

.proof-band span {
  color: var(--white);
  background: rgba(255, 255, 255, 0.13);
}

.proof-band strong {
  display: block;
  margin-top: 18px;
  font-size: 22px;
}

.proof-band p {
  margin: 10px 0 0;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.75;
}

.client-cloud {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
}

.client-cloud span {
  display: grid;
  min-height: 116px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #21324a;
  background: var(--white);
  box-shadow: 0 14px 36px rgba(15, 35, 66, 0.06);
  font-size: clamp(19px, 2vw, 26px);
  font-weight: 800;
}

.method-section {
  padding-top: 20px;
}

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

.timeline div {
  position: relative;
  padding: 30px;
  border-top: 3px solid var(--blue);
  border-radius: 0 0 8px 8px;
  background: var(--white);
  box-shadow: 0 14px 36px rgba(15, 35, 66, 0.06);
}

.timeline b {
  display: block;
  margin-bottom: 12px;
  font-size: 20px;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 0.7fr);
  gap: 58px;
  align-items: center;
  margin: 34px clamp(20px, 5vw, 72px) 80px;
  padding: 58px;
  border-radius: 8px;
  color: var(--white);
  background:
    radial-gradient(circle at 90% 20%, rgba(245, 165, 36, 0.32), transparent 24%),
    linear-gradient(135deg, #08203f, #0c1322 68%);
  box-shadow: var(--shadow);
}

.contact-section p {
  margin-top: 20px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 17px;
}

.contact-form {
  display: grid;
  gap: 16px;
}

.contact-form label {
  display: grid;
  gap: 8px;
}

.contact-form span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  color: var(--white);
  background: rgba(255, 255, 255, 0.09);
  outline: 0;
}

.contact-form input {
  min-height: 48px;
  padding: 0 14px;
}

.contact-form textarea {
  resize: vertical;
  padding: 14px;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(255, 255, 255, 0.42);
}

.contact-form button {
  min-height: 52px;
  color: var(--white);
  background: linear-gradient(135deg, var(--blue), var(--green));
}

.form-note {
  min-height: 24px;
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  line-height: 1.7;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(20px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.lucide {
  width: 19px;
  height: 19px;
  stroke-width: 2.2;
}

@media (max-width: 980px) {
  .site-nav,
  .nav-action {
    display: none;
  }

  .menu-button {
    display: grid;
  }

  .site-header.is-open .site-nav {
    position: absolute;
    top: 76px;
    left: 20px;
    right: 20px;
    display: grid;
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--white);
    box-shadow: var(--shadow);
  }

  .site-header.is-open .site-nav a {
    padding: 15px 12px;
  }

  .section-heading.split,
  .about-grid,
  .service-list,
  .proof-band,
  .timeline,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .client-cloud {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .site-header {
    padding: 14px 18px;
  }

  .brand {
    min-width: 0;
  }

  .brand small {
    display: none;
  }

  .hero {
    min-height: 100vh;
    padding: 118px 20px 34px;
  }

  .hero-panel {
    grid-template-columns: 1fr;
    margin-top: 46px;
  }

  .hero-panel div {
    padding: 20px;
  }

  .hero-actions {
    display: grid;
  }

  .section {
    padding: 68px 20px;
  }

  .about-card,
  .service-item,
  .timeline div {
    padding: 26px;
  }

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

  .client-cloud span {
    min-height: 88px;
  }

  .contact-section {
    margin: 20px 20px 58px;
    padding: 32px 22px;
  }

  .site-footer {
    display: grid;
  }
}