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

html {
  scroll-behavior: auto;
}

body {
  font-family: Tahoma, "Microsoft YaHei", sans-serif;
  background: #ffffff;
  color: #2a2a2a;
  line-height: 1.75;
  font-size: 16px;
}

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

a {
  color: #E8772E;
  text-decoration: none;
}

.wrap {
  width: min(1100px, calc(100% - 36px));
  margin: 0 auto;
}

.topbar {
  background: #ffffff;
  border-bottom: 1px solid #f0e4d8;
}

.topbar-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  min-height: 70px;
  padding: 14px 0 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: #2E8B57;
}

.brand svg {
  width: 28px;
  height: 28px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  padding-bottom: 4px;
}

.nav a {
  color: #444;
  font-size: 14px;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}

.nav a:hover {
  color: #E8772E;
  border-bottom-color: #E8772E;
  text-decoration: none;
}

.hero {
  background: #FFF4EC;
  padding: 40px 0 28px;
}

.hero h1 {
  font-size: 30px;
  line-height: 1.4;
  margin-bottom: 14px;
  color: #2a2a2a;
}

.hero p {
  margin-bottom: 12px;
  max-width: 760px;
}

.file-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.file-chip {
  background: #fff;
  border-radius: 10px;
  padding: 14px 12px;
  text-align: center;
  border: 1px solid #f3d8c4;
}

.file-chip svg {
  width: 30px;
  height: 30px;
  margin: 0 auto 8px;
}

.file-chip strong {
  display: block;
  font-size: 14px;
  color: #E8772E;
}

.section {
  padding: 36px 0;
}

.section h2 {
  font-size: 23px;
  line-height: 1.45;
  margin-bottom: 14px;
  color: #2E8B57;
}

.section p {
  margin-bottom: 12px;
}

.feat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 16px;
}

.feat-card {
  background: #fff;
  border-radius: 10px;
  padding: 18px 16px;
  border-top: 4px solid #E8772E;
  box-shadow: 0 6px 18px rgba(232, 119, 46, 0.08);
}

.feat-card svg {
  width: 28px;
  height: 28px;
  margin-bottom: 10px;
}

.feat-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.flow {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-top: 18px;
}

.flow-item {
  flex: 1;
  background: #FFF4EC;
  border-radius: 10px;
  padding: 16px;
}

.flow-item h3 {
  font-size: 15px;
  margin-bottom: 8px;
  color: #E8772E;
}

.flow-arrow {
  width: 0;
  height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 12px solid #E8772E;
  align-self: center;
  margin: 0 8px;
  flex-shrink: 0;
}

table.limits {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
  border-radius: 10px;
  overflow: hidden;
}

table.limits th,
table.limits td {
  border: 1px solid #eadfd4;
  padding: 11px 12px;
  text-align: left;
  font-size: 14px;
  vertical-align: top;
}

table.limits th {
  background: #FFF4EC;
  color: #E8772E;
}

.faq details {
  border: 1px solid #f0e0d2;
  border-radius: 10px;
  padding: 12px 14px 12px 52px;
  margin-bottom: 10px;
  position: relative;
  background: #fffaf6;
}

.faq details::before {
  content: attr(data-n);
  position: absolute;
  left: 12px;
  top: 12px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #E8772E;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 26px;
  text-align: center;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
}

.faq details p {
  margin-top: 8px;
  margin-bottom: 0;
}

.site-footer {
  background: #ffffff;
  border-top: 3px solid #E8772E;
  padding: 28px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 18px;
}

.site-footer p {
  font-size: 14px;
  color: #555;
  margin-bottom: 8px;
}

@media (max-width: 880px) {
  .topbar-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .file-row,
  .feat-grid,
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .flow {
    flex-direction: column;
  }

  .flow-arrow {
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-top: 12px solid #E8772E;
    border-bottom: 0;
    margin: 8px auto;
  }

  .hero h1 {
    font-size: 24px;
  }
}

@media (max-width: 560px) {
  .file-row,
  .feat-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }
}