:root {
  --sea: #0D7377;
  --sea-deep: #08484b;
  --coral: #E84545;
  --foam: #f4fbfb;
  --white: #ffffff;
  --ink: #163033;
  --muted: #4a6466;
  --line: #c5d9da;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: Tahoma, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--white);
  color: var(--ink);
  line-height: 1.7;
}

a { color: var(--sea); text-decoration: none; }
a:hover { color: var(--coral); }

.mast {
  background: var(--sea);
  color: #fff;
  padding: 0;
}

.mast-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  max-width: 1080px;
  margin: 0 auto;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.mast nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-size: 0.88rem;
}

.mast nav a { color: #d7f3f3; }
.mast nav a:hover { color: #fff; }

.hero-strip {
  background: var(--foam);
  border-bottom: 6px solid var(--coral);
  padding: 40px 24px 32px;
}

.hero-strip .inner, .band .inner { max-width: 1080px; margin: 0 auto; }

.hero-strip h1 {
  font-size: 1.9rem;
  line-height: 1.35;
  color: var(--sea-deep);
  max-width: 900px;
}

.hero-strip p {
  margin-top: 14px;
  max-width: 820px;
  color: var(--muted);
}

.band { padding: 36px 24px 10px; }

.band h2 {
  font-size: 1.4rem;
  color: var(--sea);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--coral);
  display: inline-block;
}

.band > .inner > p { color: var(--muted); margin-bottom: 14px; }

.tiles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 8px 0 16px;
}

.tile {
  background: var(--foam);
  border: 1px solid var(--line);
  padding: 16px 14px 12px;
  min-height: 150px;
}

.tile svg { margin-bottom: 8px; }

.tile h3 {
  font-size: 1rem;
  color: var(--sea-deep);
  margin-bottom: 6px;
}

.tile p { font-size: 0.92rem; color: var(--muted); }

.dual {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 10px 0 16px;
}

.lane {
  border: 1px solid var(--line);
  background: var(--white);
}

.lane header {
  padding: 10px 14px;
  font-weight: 700;
  color: #fff;
}

.lane.send header { background: var(--sea); }
.lane.recv header { background: var(--coral); }

.lane ol { padding: 12px 14px 12px 36px; }
.lane li { margin-bottom: 10px; }
.lane p { padding: 0 14px 12px; color: var(--muted); }

.steps {
  counter-reset: send;
  list-style: none;
  margin: 8px 0 16px;
}

.steps li {
  counter-increment: send;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px dashed var(--line);
}

.steps li::before {
  content: counter(send);
  width: 42px;
  height: 42px;
  background: var(--coral);
  color: #fff;
  text-align: center;
  line-height: 42px;
  font-weight: 700;
}

.drop-note {
  background: var(--foam);
  padding: 14px 16px;
  margin-bottom: 14px;
  border-left: 5px solid var(--sea);
}

.limit-table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 16px;
  font-size: 0.94rem;
}

.limit-table th, .limit-table td {
  border: 1px solid var(--line);
  padding: 11px 12px;
  text-align: left;
  vertical-align: top;
}

.limit-table th { background: var(--sea-deep); color: #fff; }
.limit-table tr:nth-child(odd) td { background: var(--foam); }

.phone-back {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.phone-back article {
  padding: 14px 16px;
  background: var(--white);
  box-shadow: inset 0 0 0 1px var(--line);
}

.phone-back h3 { color: var(--coral); font-size: 1rem; margin-bottom: 6px; }

.qa {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.qa article {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.qa h3 { font-size: 1rem; color: var(--sea-deep); margin-bottom: 6px; }
.qa p { color: var(--muted); }

.colophon {
  background: var(--sea-deep);
  color: #d5ecec;
  padding: 26px 24px 34px;
}

.colophon .inner { max-width: 1080px; margin: 0 auto; }
.colophon p { margin-bottom: 8px; font-size: 0.9rem; }
.colophon time { color: #f5b4b4; }

@media (min-width: 800px) {
  .tiles { grid-template-columns: 1fr 1fr 1fr; }
  .dual { grid-template-columns: 1fr 1fr; }
  .phone-back { grid-template-columns: 1fr 1fr; }
}