* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  background: #f0fdfa;
  color: #134e4a;
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

a {
  color: #0f766e;
}

img,
svg {
  vertical-align: middle;
}

.site-header {
  background: #0f766e;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  border-bottom: 2px solid #134e4a;
}

.brand {
  color: #fff;
  text-decoration: none;
  font-size: 22px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.site-nav a {
  color: #fff;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}

.site-nav a:hover,
.site-nav a.current {
  border-bottom-color: #fff;
}

.hero {
  display: flex;
  width: 100%;
  border-bottom: 2px solid #134e4a;
}

.hero-left {
  width: 42%;
  background: #0d9488;
  color: #fff;
  padding: 40px 32px 44px;
}

.hero-left h1 {
  font-size: 30px;
  line-height: 1.35;
  margin-bottom: 16px;
  font-weight: 700;
}

.hero-left .lead {
  font-size: 16px;
  line-height: 1.75;
  color: #f0fdfa;
}

.hero-right {
  width: 58%;
  background: #f7faf9;
  padding: 36px 32px 40px;
}

.hero-right .dl-note {
  margin-bottom: 14px;
  font-size: 15px;
}

.btn-win {
  display: block;
  width: 100%;
  background: #0f766e;
  color: #fff;
  text-decoration: none;
  text-align: center;
  font-size: 24px;
  font-weight: 700;
  padding: 22px 18px;
  border: 2px solid #134e4a;
  margin-bottom: 14px;
}

.btn-win:hover {
  background: #134e4a;
}

.btn-win svg {
  margin-right: 8px;
}

.os-row {
  display: flex;
  gap: 10px;
}

.btn-os {
  flex: 1;
  display: block;
  text-align: center;
  text-decoration: none;
  color: #0f766e;
  background: #fff;
  border: 2px solid #0f766e;
  padding: 12px 8px;
  font-size: 15px;
  font-weight: 700;
}

.btn-os:hover {
  background: #ccfbf1;
}

main {
  width: 100%;
  padding: 28px 32px 48px;
}

section {
  margin-bottom: 36px;
}

h2 {
  font-size: 22px;
  line-height: 1.4;
  margin-bottom: 12px;
  padding: 8px 0 8px 12px;
  border-left: 4px solid #0d9488;
  color: #134e4a;
}

h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

p {
  margin-bottom: 12px;
}

.zebra {
  width: 100%;
  border-collapse: collapse;
  border: 2px solid #0f766e;
  margin: 12px 0 8px;
}

.zebra th,
.zebra td {
  border: 2px solid #0d9488;
  padding: 9px 12px;
  text-align: left;
  vertical-align: top;
}

.zebra th {
  background: #0f766e;
  color: #fff;
  font-weight: 700;
}

.zebra tr:nth-child(even) td {
  background: #ccfbf1;
}

.zebra tr:nth-child(odd) td {
  background: #ffffff;
}

.review {
  width: 100%;
  border-collapse: collapse;
  border: 2px solid #0f766e;
  margin: 0 0 10px;
}

.review td {
  border: 2px solid #0d9488;
  padding: 8px 12px;
  vertical-align: top;
}

.review td:nth-child(1) {
  width: 16%;
  background: #99f6e4;
  font-weight: 700;
}

.review td:nth-child(2) {
  width: 58%;
  background: #ffffff;
}

.review td:nth-child(3) {
  width: 26%;
  background: #ccfbf1;
}

.timeline {
  margin: 14px 0;
  padding-left: 22px;
  border-left: 4px solid #0d9488;
}

.t-item {
  position: relative;
  margin: 0 0 18px;
  padding-left: 16px;
}

.t-item .t-dot {
  position: absolute;
  left: -31px;
  top: 4px;
}

.t-item p {
  margin-bottom: 0;
}

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

.faq-item {
  border: 2px solid #0f766e;
  padding: 12px 14px;
  background: #ffffff;
}

.faq-item:nth-child(even) {
  background: #ccfbf1;
}

.faq-item .q {
  font-weight: 700;
  margin-bottom: 8px;
}

.faq-item .a {
  margin-bottom: 0;
}

.inline-dl {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 12px 0;
}

.inline-dl .btn-win {
  width: auto;
  flex: 1 1 280px;
  margin-bottom: 0;
  font-size: 18px;
  padding: 16px 14px;
}

.inline-dl .btn-os {
  flex: 1 1 140px;
}

.site-footer {
  background: #134e4a;
  color: #ecfdf5;
  padding: 22px 28px;
  border-top: 2px solid #0f766e;
}

.site-footer p {
  margin: 0;
  line-height: 1.8;
}

@media (max-width: 900px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .hero {
    flex-direction: column;
  }

  .hero-left,
  .hero-right {
    width: 100%;
  }

  .os-row {
    flex-direction: column;
  }

  .faq-grid {
    grid-template-columns: 1fr;
  }

  main {
    padding: 20px 14px 36px;
  }
}