:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-strong: #eef4f8;
  --text: #17222d;
  --muted: #657282;
  --line: #dce5ec;
  --accent: #0d7f8a;
  --accent-dark: #0b6570;
  --blue: #234a84;
  --gold: #c49345;
  --shadow: 0 22px 50px rgba(24, 44, 68, 0.12);
  --radius: 8px;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  scroll-behavior: smooth;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top right, rgba(13, 127, 138, 0.12), transparent 28rem),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 42%, #ffffff 100%);
}

body.nav-open {
  overflow: hidden;
}

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

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

.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;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 14px clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid rgba(220, 229, 236, 0.8);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  flex: 0 0 auto;
  color: #ffffff;
  font-weight: 800;
  background: linear-gradient(135deg, var(--blue), var(--accent));
  border-radius: var(--radius);
  box-shadow: 0 12px 24px rgba(13, 127, 138, 0.2);
}

.brand-text {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.brand-text strong {
  font-size: 16px;
  line-height: 1.2;
  white-space: nowrap;
}

.brand-text small {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  padding: 10px 14px;
  color: var(--muted);
  font-size: 14px;
  border-radius: var(--radius);
  transition: color 0.2s ease, background 0.2s ease;
}

.site-nav a:hover {
  color: var(--text);
  background: var(--surface-strong);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.nav-toggle span:not(.sr-only) {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--text);
  border-radius: 99px;
}

.section-shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.9fr);
  align-items: center;
  gap: clamp(32px, 7vw, 88px);
  min-height: calc(100vh - 76px);
  padding: 64px 0 72px;
}

.company-line,
.section-heading p,
.contact-copy p {
  margin: 0 0 14px;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 720px;
  font-size: clamp(38px, 6vw, 68px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-summary {
  margin: 24px 0 0;
  max-width: 640px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.9;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 700;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.button.primary {
  color: #ffffff;
  background: var(--accent);
  box-shadow: 0 16px 30px rgba(13, 127, 138, 0.22);
}

.button.secondary {
  color: var(--text);
  background: var(--surface);
  border-color: var(--line);
}

.hero-visual {
  position: relative;
  padding: clamp(10px, 2vw, 20px);
}

.hero-visual::before {
  position: absolute;
  inset: 8% 0 0 14%;
  content: "";
  background: linear-gradient(135deg, rgba(35, 74, 132, 0.13), rgba(13, 127, 138, 0.16));
  border-radius: 40% 60% 48% 52%;
  transform: rotate(-8deg);
}

.hero-visual img {
  position: relative;
  width: 100%;
  filter: drop-shadow(0 24px 36px rgba(24, 44, 68, 0.18));
}

.intro-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  width: min(1120px, calc(100% - 40px));
  margin: -26px auto 0;
  overflow: hidden;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.intro-band div {
  display: grid;
  gap: 8px;
  min-height: 128px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.94);
}

.intro-band strong {
  font-size: 20px;
}

.intro-band span {
  color: var(--muted);
  line-height: 1.8;
}

.section-heading {
  max-width: 680px;
  margin: 96px auto 34px;
  text-align: center;
}

.section-heading.left {
  margin: 0;
  text-align: left;
}

.section-heading h2,
.contact-copy h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.2;
  letter-spacing: 0;
}

.section-heading span,
.contact-copy > span {
  display: block;
  margin-top: 14px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.85;
}

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

.service-card,
.advantage-item {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 14px 28px rgba(24, 44, 68, 0.06);
}

.service-icon {
  display: inline-grid;
  width: 44px;
  height: 44px;
  margin-bottom: 24px;
  place-items: center;
  color: #ffffff;
  font-size: 13px;
  font-weight: 800;
  background: var(--blue);
  border-radius: var(--radius);
}

.service-card h3,
.advantage-item h3,
.process-list h3 {
  margin: 0 0 12px;
  font-size: 21px;
  line-height: 1.35;
}

.service-card p,
.advantage-item p,
.process-list p {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
}

.process-section {
  margin-top: 110px;
  padding: 92px 0;
  background: #162334;
  color: #ffffff;
}

.process-section .section-heading p,
.process-section .section-heading span {
  color: rgba(255, 255, 255, 0.72);
}

.process-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.7fr) minmax(0, 1fr);
  gap: clamp(32px, 7vw, 82px);
  align-items: start;
}

.process-list {
  display: grid;
  gap: 16px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.process-list li {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 18px;
  padding: 22px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
}

.process-list li > span {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  color: #17222d;
  font-weight: 800;
  background: #f1c36e;
  border-radius: var(--radius);
}

.process-list p {
  color: rgba(255, 255, 255, 0.72);
}

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

.contact-section {
  margin-top: 104px;
  padding: 92px 0;
  background:
    linear-gradient(135deg, rgba(13, 127, 138, 0.94), rgba(35, 74, 132, 0.96)),
    #0d7f8a;
  color: #ffffff;
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(320px, 0.72fr);
  gap: clamp(32px, 7vw, 88px);
  align-items: start;
}

.contact-copy p,
.contact-copy > span {
  color: rgba(255, 255, 255, 0.75);
}

.contact-lines {
  display: grid;
  gap: 10px;
  margin-top: 30px;
  color: rgba(255, 255, 255, 0.88);
}

.contact-form {
  display: grid;
  gap: 16px;
  padding: 28px;
  color: var(--text);
  background: #ffffff;
  border-radius: var(--radius);
  box-shadow: 0 22px 52px rgba(4, 20, 32, 0.2);
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 13px 14px;
  color: var(--text);
  font: inherit;
  font-size: 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(13, 127, 138, 0.14);
}

.contact-form textarea {
  resize: vertical;
}

.form-note {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.form-note.success {
  color: var(--accent-dark);
  font-weight: 700;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 24px clamp(20px, 5vw, 72px);
  color: var(--muted);
  font-size: 14px;
  background: #ffffff;
}

@media (max-width: 920px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 76px;
    right: 20px;
    left: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 14px;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
  }

  body.nav-open .site-nav {
    display: flex;
  }

  .site-nav a {
    padding: 14px;
  }

  .hero,
  .process-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 42px;
  }

  .hero-visual {
    max-width: 560px;
    margin: 0 auto;
  }

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

@media (max-width: 640px) {
  .site-header {
    min-height: 68px;
    padding: 10px 16px;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
  }

  .brand-text strong {
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .brand-text small {
    display: none;
  }

  .site-nav {
    top: 68px;
    right: 14px;
    left: 14px;
  }

  .section-shell,
  .intro-band {
    width: min(100% - 28px, 1120px);
  }

  .hero {
    padding: 32px 0 24px;
  }

  .hero-summary {
    font-size: 16px;
    line-height: 1.75;
  }

  .hero-actions {
    margin-top: 24px;
  }

  .hero-visual {
    max-width: 315px;
  }

  .intro-band {
    margin-top: 0;
  }

  .hero-actions,
  .site-footer {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .intro-band,
  .service-grid,
  .advantage-grid {
    grid-template-columns: 1fr;
  }

  .section-heading {
    margin-top: 72px;
  }

  .service-card,
  .advantage-item,
  .contact-form {
    padding: 22px;
  }

  .process-section,
  .contact-section {
    margin-top: 76px;
    padding: 68px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  :root {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}