:root {
  --color-primary: #1677ff;
  --color-primary-dark: #0f63dc;
  --color-ink: #111827;
  --color-muted: #667085;
  --color-surface: #f9fafb;
  --color-panel: #f6f8fc;
  --color-border: #e7eaf0;
  --color-success: #55c77a;
  --color-footer: #111827;
  --shadow-card: 0 12px 30px rgb(17 24 39 / 7%);
  --radius-card: 16px;
  --content-width: 1216px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--color-ink);
  background: #fff;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  line-height: 1.65;
}

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

button, a { -webkit-tap-highlight-color: transparent; }

.container {
  width: min(calc(100% - 48px), var(--content-width));
  margin-inline: auto;
}

.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;
}

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 64px;
  background: rgb(255 255 255 / 94%);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(14px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.site-header__actions .button {
  min-height: 44px;
  padding: 8px 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  color: var(--color-ink);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand__logo { display: block; width: auto; max-width: 156px; height: 34px; object-fit: contain; object-position: left center; }
.brand__name { color: var(--color-ink); font-size: 22px; font-weight: 800; letter-spacing: -0.04em; }
.site-footer .brand__name { color: #fff; }

.site-navigation ul,
.mobile-navigation ul,
.site-footer ul {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-navigation a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 600;
  transition: color 160ms ease;
}

.site-navigation a:hover,
.site-navigation a[aria-current="page"] { color: var(--color-primary); }

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  color: var(--color-ink);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  cursor: pointer;
}

.mobile-navigation { display: none; }

#steps,
#services,
#channels,
#contact,
#faq,
#footer-contact { scroll-margin-top: 80px; }

.hero {
  display: grid;
  align-items: center;
  min-height: 466px;
  overflow: hidden;
  background: linear-gradient(120deg, #fff 0%, #f7faff 100%);
  text-align: center;
}

.hero .container { max-width: 840px; padding-block: 80px; }
.hero h1,
section h2 { margin: 0; color: var(--color-ink); letter-spacing: -0.045em; }
.hero h1 { font-size: clamp(42px, 4vw, 48px); line-height: 1.16; }
.hero p { max-width: 660px; margin: 24px auto 0; color: var(--color-muted); font-size: 18px; }

.hero__actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  border: 1px solid var(--color-primary);
  border-radius: 9px;
  background: var(--color-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.button:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); transform: translateY(-1px); }
.button--outline { background: #fff; color: var(--color-primary); }
.button--outline:hover { background: #f4f8ff; }
.hero__actions .button + .button { background: #fff; color: var(--color-primary); }
.hero__actions .button + .button:hover { background: #f4f8ff; }

section:not(.hero) { padding: 80px 0; }
section > .container > h2 { font-size: clamp(30px, 3vw, 40px); line-height: 1.25; text-align: center; }
section > .container > h2 + p { max-width: 640px; margin: 14px auto 48px; color: var(--color-muted); text-align: center; }

.steps { background: var(--color-surface); }
.card-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }

.step-card,
.service-card,
.channel-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: #fff;
  box-shadow: var(--shadow-card);
}

.step-card { padding: 28px 24px; background: var(--color-panel); border-color: transparent; box-shadow: none; }
.step-card > i { display: grid; place-items: center; width: 46px; height: 46px; color: var(--color-primary); background: #eaf3ff; border-radius: 12px; font-size: 20px; }
.step-card h3,
.service-card h3,
.channel-card h3 { margin: 20px 0 8px; font-size: 18px; line-height: 1.35; }
.step-card h3 { display: flex; align-items: center; gap: 10px; }
.step-card__sequence {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 24px;
  padding: 0 7px;
  border-radius: 999px;
  background: var(--color-primary);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  line-height: 1;
}
.step-card p,
.service-card > p { margin: 0; color: var(--color-muted); font-size: 14px; }

.services { background: var(--color-surface); }
.services .card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); max-width: 1120px; margin: 0 auto; }
.service-card {
  display: flex;
  flex-direction: column;
  min-height: 360px;
  padding: 32px;
  transition: transform 200ms ease, box-shadow 200ms ease;
}
.service-card--primary { border-color: #b9d7ff; box-shadow: 0 16px 38px rgb(22 119 255 / 12%); }
.service-card--dark { background: var(--color-ink); color: #fff; border-color: var(--color-ink); box-shadow: 0 16px 38px rgb(17 24 39 / 16%); }
.service-card--dark > p,
.service-card--dark ul { color: #d0d5dd; }
.service-card--dark .service-card__price { color: #a8ccff !important; }
.service-card--dark .button { background: #fff; border-color: #fff; color: var(--color-ink); }
.service-card--dark .button:hover { background: #eaf3ff; border-color: #eaf3ff; }
.service-card__price { margin: 16px 0 5px !important; color: var(--color-primary) !important; font-size: 28px !important; font-weight: 800; }
.service-card ul { display: grid; gap: 10px; margin: 24px 0; padding: 0; color: var(--color-muted); list-style: none; font-size: 14px; }
.service-card li::before { margin-right: 9px; color: var(--color-success); content: "✓"; font-weight: 800; }
.service-card .button { width: fit-content; margin-top: auto; }

@media (hover: hover) and (pointer: fine) {
  .service-card:hover { transform: translateY(-6px); box-shadow: 0 24px 50px rgb(17 24 39 / 18%); }
  .service-card--primary:hover { box-shadow: 0 24px 50px rgb(22 119 255 / 18%); }
}

.channels { background: #fff; }
.channel-list { display: flex; flex-wrap: nowrap; justify-content: center; gap: 16px; }
.channel-card { display: flex; flex: 0 0 110px; flex-direction: column; align-items: center; gap: 8px; min-width: 0; padding: 12px 18px; border-color: transparent; background: transparent; box-shadow: none; }
.channel-card__icon { display: block; width: 34px; height: 34px; object-fit: contain; }
.channel-card h3 { margin: 0; font-size: 16px; }
.channels__notice {
  max-width: 720px;
  margin: 30px auto 0;
  padding: 13px 18px;
  border: 1px solid #cfe2ff;
  border-radius: 10px;
  background: #f1f7ff;
  color: #315783;
  font-size: 14px;
  line-height: 1.7;
  text-align: center;
}

section.faq {
  padding: 88px 0;
  background: var(--color-panel);
}

.faq .container > h2,
.faq__description {
  text-align: center;
}

.faq__description {
  margin: 14px auto 38px;
  color: var(--color-muted);
}

.faq__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.faq-card {
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: #fff;
  box-shadow: var(--shadow-card);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.faq-card:active { transform: translateY(2px) scale(.99); box-shadow: 0 8px 20px rgb(17 24 39 / 8%); }

.faq-card h3 {
  margin: 0 0 12px;
  font-size: 18px;
}

.faq-card p {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.8;
}

.contact { align-items: stretch; text-align: left; }
.contact-section .contact { max-width: 560px; padding: 36px; border: 1px solid var(--color-border); border-radius: var(--radius-card); background: #fff; box-shadow: var(--shadow-card); }
.contact-section .contact h2 { margin: 18px 0 0; font-size: 28px; }
.contact__icon { display: grid; place-items: center; width: 50px; height: 50px; color: var(--color-primary); background: #eaf3ff; border-radius: 14px; font-size: 21px; }
.contact h3 { margin: 18px 0 0; font-size: 22px; }
.contact img { display: block; width: 64px; height: 64px; margin: 20px 0 10px; border: 3px solid #fff; border-radius: 50%; box-shadow: 0 5px 18px rgb(17 24 39 / 12%); object-fit: cover; }
.contact p { margin: 7px 0; color: var(--color-muted); }
.contact .contact__name { margin-top: 14px; color: var(--color-ink); font-size: 17px; font-weight: 750; }
.contact .contact__description { max-width: 400px; line-height: 1.75; }
.contact a { display: inline-flex; align-items: center; min-height: 44px; color: var(--color-primary); }
.contact__methods,
.site-footer__contact-methods { display: grid !important; gap: 0 !important; margin: 18px 0 0 !important; padding: 14px 0 0 !important; border-top: 1px solid var(--color-border); list-style: none; }
.contact__methods li,
.site-footer__contact-methods li { display: grid; grid-template-columns: minmax(92px, auto) 1fr; align-items: center; gap: 12px; min-height: 42px; }
.contact-method__label { display: inline-flex; align-items: center; gap: 8px; color: var(--color-muted); font-size: 13px; font-weight: 650; }
.contact-method__label i { width: 16px; color: var(--color-primary); text-align: center; }
.contact__methods li > :last-child { min-width: 0; overflow-wrap: anywhere; color: var(--color-ink); font-size: 14px; }
.contact--service h3 { margin: 20px 0 8px; font-size: 18px; }
.contact--service .contact__description { margin: 0; font-size: 14px; line-height: 1.7; }
.contact--service .contact__action { margin-top: auto; }
.site-footer { padding: 40px 0 30px; background: var(--color-footer); color: #98a2b3; }
.site-footer .container { display: grid; width: min(calc(100% - 108px), var(--content-width)); gap: 0; }
.site-footer__grid { display: grid; grid-template-columns: 1.25fr .78fr 1.05fr .9fr; align-items: start; column-gap: 24px; row-gap: 28px; }
.site-footer__brand { display: grid; align-content: start; gap: 18px; }
.site-footer__brand .brand { width: fit-content; color: #fff; }
.site-footer h2 { margin: 0 0 20px; color: #fff; font-size: 18px; line-height: 1.4; }
.site-footer p { margin: 0; max-width: 720px; font-size: 14px; line-height: 1.8; }
.site-footer ul { flex-direction: column; gap: 0; }
.site-footer a { display: inline-flex; align-items: center; min-height: 44px; color: #98a2b3; font-size: 14px; }
.site-footer a:hover { color: #a8ccff; }
.site-footer__quick-links h2 { margin-bottom: 12px; }
.site-footer__partners h2 { margin-bottom: 12px; }
.site-footer__quick-links ul,
.site-footer__partners ul { display: flex; gap: 2px; }
.site-footer__quick-links a { min-height: 36px; }
.site-footer .site-footer__partner-text-link { min-height: 30px; line-height: 1.45; }
.site-footer__partners ul { gap: 6px; }
.site-footer__partner-logo-link {
  justify-content: center;
  width: 148px;
  height: 52px;
  min-height: 48px !important;
  padding: 8px 12px;
  overflow: hidden;
  background: #fff;
  border: 1px solid rgb(255 255 255 / 18%);
  border-radius: 9px;
  transition: border-color 160ms ease, transform 160ms ease;
}
.site-footer__partner-logo-link:hover { border-color: rgb(22 119 255 / 70%); transform: translateY(-2px); }
.site-footer__partner-logo { display: block; width: 100%; height: 100%; max-width: 124px; max-height: 36px; object-fit: contain; }
.site-footer .site-footer__contact-icons { display: flex; flex-flow: row wrap; gap: 10px; margin-top: 14px; }
.site-footer__contact-icons li { display: block; }
.site-footer .contact-method__icon-link {
  justify-content: center;
  width: 44px;
  height: 44px;
  min-height: 44px;
  padding: 0;
  color: #a8ccff;
  background: rgb(255 255 255 / 6%);
  border: 1px solid rgb(255 255 255 / 12%);
  border-radius: 12px;
  font-size: 19px;
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}
.site-footer .contact-method__icon-link:hover { color: #fff; background: rgb(22 119 255 / 22%); border-color: rgb(22 119 255 / 56%); }
.contact-method__icon-link i { pointer-events: none; }
.site-footer__contact-methods { margin-top: 0 !important; padding-top: 0 !important; border-top: 0; }
.site-footer__contact-methods li { grid-template-columns: 82px 1fr; min-height: 44px; }
.site-footer__contact-methods .contact-method__label { color: #98a2b3; }
.site-footer__contact-methods li > :last-child { min-width: 0; overflow-wrap: anywhere; color: #98a2b3; font-size: 14px; }
.site-footer__merchant { display: grid; align-content: start; justify-items: start; }
.site-footer__merchant-action { justify-content: center; min-width: 154px; min-height: 52px !important; padding-inline: 24px; color: #fff !important; font-size: 16px !important; }
.site-footer__contact-icons + .site-footer__merchant-action { margin-top: 12px; }
.site-footer__friends {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 20px;
  margin-top: 26px;
  padding: 12px 0;
  border-top: 1px solid rgb(255 255 255 / 10%);
  border-bottom: 1px solid rgb(255 255 255 / 10%);
}
.site-footer__friends h2 { flex: 0 0 auto; margin: 0; font-size: 14px; }
.site-footer .site-footer__friends ul { display: flex; flex-flow: row wrap; gap: 4px 20px; }
.site-footer__friends a { min-height: 32px; }
.site-footer__meta { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 24px; margin-top: 24px; padding-top: 24px; border-top: 1px solid rgb(255 255 255 / 10%); text-align: center; }
.site-footer__friends + .site-footer__meta { margin-top: 0; padding-top: 18px; border-top: 0; }

.back-to-top {
  position: fixed;
  inset-inline-end: max(20px, env(safe-area-inset-right));
  bottom: max(20px, env(safe-area-inset-bottom));
  z-index: 30;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  color: #fff;
  background: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: 12px;
  box-shadow: 0 12px 30px rgb(22 119 255 / 28%);
  cursor: pointer;
  transition: transform 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}
.back-to-top[hidden] { display: none; }

@media (hover: hover) and (pointer: fine) {
  .faq-card:hover { transform: translateY(-3px); box-shadow: 0 16px 34px rgb(17 24 39 / 11%); }
  .back-to-top:hover { transform: translateY(-2px); background: var(--color-primary-dark); box-shadow: 0 16px 36px rgb(22 119 255 / 34%); }
}

body.menu-open { overflow: hidden; }

@media (max-width: 900px) {
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 32px; }
}

@media (max-width: 768px) {
  .container { width: min(calc(100% - 32px), var(--content-width)); }
  .site-navigation { display: none; }
  .site-header__actions { display: none; }
  .menu-toggle { display: inline-flex; }
  .mobile-navigation { position: static; display: block; padding: 12px 16px 16px; background: #fff; border-bottom: 1px solid var(--color-border); box-shadow: 0 12px 24px rgb(17 24 39 / 10%); }
  [data-mobile-menu][hidden] { display: none; }
  .mobile-navigation ul { flex-direction: column; gap: 3px; }
  .mobile-navigation a { display: flex; align-items: center; min-height: 44px; padding: 0 12px; color: var(--color-ink); border-radius: 8px; font-weight: 650; }
  .mobile-navigation a[aria-current="page"], .mobile-navigation a:hover { color: var(--color-primary); background: #f1f7ff; }
  .mobile-navigation__actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 10px; }
  .mobile-navigation__actions .button { padding-inline: 10px; }
  .mobile-navigation__actions .button--primary { color: #fff; }
  .hero { min-height: 466px; }
  .hero .container { padding-block: 64px; }
  .hero p { font-size: 16px; }
  section:not(.hero) { padding: 64px 0; }
  section > .container > h2 + p { margin-bottom: 32px; }
  .card-grid, .services .card-grid { grid-template-columns: 1fr; }
  section.faq { padding: 64px 0; }
  .faq__grid { grid-template-columns: 1fr; }
  .faq-card { padding: 22px; }
  .step-card, .service-card { padding: 26px 22px; }
  .service-card { min-height: auto; }
  .site-footer { padding-top: 42px; }
  .site-footer .container { width: min(calc(100% - 32px), var(--content-width)); }
  .site-footer__grid { grid-template-columns: 1fr; gap: 20px; }
  .site-footer ul { flex-direction: column; gap: 0; }
  .site-footer__partners ul { gap: 6px; }
  .site-footer__friends { align-items: flex-start; margin-top: 24px; }
  .site-footer .site-footer__friends ul { flex-flow: row wrap; }
  .site-footer .site-footer__contact-icons { flex-direction: row; gap: 10px; }
  .back-to-top { inset-inline-end: max(16px, env(safe-area-inset-right)); bottom: max(16px, env(safe-area-inset-bottom)); }
}

@media (max-width: 420px) {
  .hero h1 { font-size: 36px; }
  .hero__actions { flex-direction: column; }
  .hero__actions .button { width: 100%; }
  .channel-list { flex-direction: row; flex-wrap: nowrap; gap: 8px; }
  .channel-card { flex: 0 1 114px; padding-inline: 4px; }
  .channel-card h3 { font-size: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
  .service-card:hover { transform: none; }
  .faq-card:hover, .faq-card:active { transform: none; }
  .back-to-top:hover { transform: none; }
}