:root {
  --paper: #f5f8fc;
  --ink: #1c2b3a;
  --deep: #0f4c9a;
  --accent: #1677ff;
  --accent-dark: #0e5fd4;
  --card: #ffffff;
  --line: #d9e4f0;
  --muted: #5c6d7e;
  --deep-muted: #5c6d7e;
  --max: 1120px;
  --header: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header);
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

a {
  color: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #ffffff;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}

.header-bar {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: var(--header);
}

.logo {
  color: var(--accent);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: 22px;
  margin-left: auto;
}

.site-nav a {
  color: #3e5166;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--accent);
}

.header-phone {
  order: 3;
  padding: 8px 14px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--accent);
  color: #ffffff;
  text-decoration: none;
  white-space: nowrap;
}

.header-phone:hover,
.header-phone:focus-visible {
  border-color: var(--accent-dark);
  background: var(--accent-dark);
  color: #ffffff;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  cursor: pointer;
}

.nav-toggle-lines,
.nav-toggle-lines::before,
.nav-toggle-lines::after {
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
  content: "";
}

.nav-toggle-lines {
  position: relative;
}

.nav-toggle-lines::before,
.nav-toggle-lines::after {
  position: absolute;
  left: 0;
}

.nav-toggle-lines::before {
  top: -5px;
}

.nav-toggle-lines::after {
  top: 5px;
}

.hero {
  background: linear-gradient(180deg, #e8f1ff 0%, var(--paper) 100%);
  color: var(--ink);
  padding: 48px 0 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.95fr);
  gap: 40px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 0.08em;
}

.hero .eyebrow {
  color: var(--accent);
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 700;
  line-height: 1.25;
}

h1 {
  font-size: clamp(36px, 5vw, 56px);
  letter-spacing: -0.02em;
}

h2 {
  max-width: 22em;
  margin-bottom: 28px;
  font-size: clamp(28px, 3vw, 36px);
}

h3 {
  font-size: 18px;
}

.lede {
  max-width: 34em;
  margin: 18px 0 28px;
  color: var(--deep-muted);
  font-size: 18px;
}

.lede.dark {
  color: var(--muted);
}

.button {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 6px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
}

.button:hover,
.button:focus-visible {
  background: var(--accent-dark);
}

.hero-art svg {
  width: 100%;
}

.band {
  padding: 80px 0;
}

.band-tight {
  padding-top: 8px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.cards li {
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--card);
}

.cards h3 {
  margin-bottom: 8px;
}

.cards p,
.steps p,
.note {
  margin: 0;
  color: var(--muted);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  padding: 20px 18px 22px;
  border-top: 2px solid var(--accent);
  background: var(--card);
}

.steps span {
  display: block;
  margin-bottom: 12px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.steps h3 {
  margin-bottom: 8px;
  font-size: 17px;
}

.note {
  margin-top: 20px;
  padding: 14px 16px;
  border-radius: 6px;
  background: #e7f1ff;
  color: var(--ink);
}

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 32px;
  align-items: end;
}

.contact-card {
  margin: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--card);
  font-style: normal;
}

.contact-card p {
  display: grid;
  gap: 4px;
  margin: 0;
}

.contact-card p + p {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.contact-card span {
  color: var(--muted);
  font-size: 14px;
}

.contact-card a {
  color: var(--ink);
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
}

.contact-card a:hover,
.contact-card a:focus-visible {
  color: var(--accent);
}

.site-footer {
  background: #ffffff;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.footer-bar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 0;
}

.footer-bar p {
  margin: 0;
}

.footer-bar a {
  color: var(--muted);
  text-decoration: none;
}

.footer-bar a:hover,
.footer-bar a:focus-visible {
  color: var(--accent);
}

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

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
    order: 4;
    margin-left: 10px;
  }

  .header-phone {
    margin-left: auto;
    padding: 8px 10px;
    font-size: 14px;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    margin: 0;
    padding: 8px 20px 16px;
    background: #ffffff;
    border-top: 1px solid var(--line);
  }

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

  .site-nav a {
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }

  .hero-grid,
  .cards,
  .steps,
  .contact-grid,
  .footer-bar {
    grid-template-columns: 1fr;
  }

  .footer-bar {
    display: grid;
  }

  .hero {
    padding-top: 28px;
  }

  .band {
    padding: 56px 0;
  }

  h1 {
    font-size: 34px;
  }
}