:root {
  --bg: #fafafa;
  --ink: #18181b;
  --muted: #52525b;
  --green: #16a34a;
  --green-deep: #15803d;
  --green-soft: #dcfce7;
  --card: #ffffff;
  --line: #e4e4e7;
  --shadow: 0 10px 28px rgba(22, 163, 74, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.75;
}

img,
svg {
  display: block;
}

a {
  color: inherit;
}

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

.topbar-inner,
.hero-inner,
.stack,
.foot-inner {
  width: min(680px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar-inner {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px 0 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  text-decoration: none;
}

.brand svg {
  flex: 0 0 auto;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav a {
  display: block;
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--green-soft);
  color: var(--green-deep);
  font-weight: 600;
  text-decoration: none;
  font-size: 16px;
}

.hero {
  background: var(--green);
  color: #ffffff;
  padding: 36px 0 44px;
}

.hero-kicker {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.86;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 7vw, 38px);
  line-height: 1.25;
}

.hero p {
  margin: 0 0 14px;
  font-size: 17px;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 58px;
  padding: 16px 20px;
  border-radius: 16px;
  background: #ffffff;
  color: var(--green-deep);
  font-size: 19px;
  font-weight: 800;
  text-decoration: none;
  box-shadow: var(--shadow);
}

.btn-hero {
  margin-top: 22px;
  width: 100%;
}

.stack {
  padding: 28px 0 8px;
}

.block {
  margin: 0 0 22px;
}

.block h2 {
  margin: 0 0 12px;
  font-size: 24px;
  line-height: 1.35;
}

.lead,
.note {
  margin: 0 0 14px;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 22px 20px 20px;
  margin: 0 0 14px;
  box-shadow: var(--shadow);
}

.card .ico {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--green-soft);
  display: grid;
  place-items: center;
  margin-bottom: 12px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 19px;
}

.card p,
.card li {
  color: var(--muted);
}

.card ul {
  margin: 0;
  padding-left: 18px;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step {
  width: 100%;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 20px;
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 14px;
  align-items: start;
}

.num {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: var(--green);
  color: #fff;
  font-size: 28px;
  font-weight: 800;
  display: grid;
  place-items: center;
}

.step h3 {
  margin: 0 0 6px;
  font-size: 18px;
}

.step p {
  margin: 0;
  color: var(--muted);
}

.compare {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.compare-pane {
  padding: 22px 20px;
  border-radius: 20px;
}

.compare-pane.good {
  background: var(--green-soft);
  border: 1px solid #bbf7d0;
}

.compare-pane.alt {
  background: #ffffff;
  border: 1px solid var(--line);
}

.compare-pane h3 {
  margin: 0 0 10px;
}

.compare-pane p {
  margin: 0 0 8px;
  color: var(--muted);
}

.limit-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.limit-list li {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 18px;
  margin: 0 0 10px;
}

.faq details {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 16px;
  margin: 0 0 10px;
}

.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 20px;
  min-height: 64px;
  display: flex;
  align-items: center;
  font-weight: 700;
  font-size: 16px;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq details p {
  margin: 0;
  padding: 0 20px 18px;
  color: var(--muted);
}

.footer {
  margin-top: 20px;
  background: #14532d;
  color: #dcfce7;
  padding: 28px 0 36px;
}

.footer p {
  margin: 0 0 10px;
  font-size: 14px;
}

@media (min-width: 720px) {
  .topbar-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .nav {
    flex-direction: row;
  }

  .nav a {
    padding: 10px 14px;
  }
}

#news .news-list { display: grid; gap: 14px; }
#news article { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px 18px 16px; box-shadow: var(--shadow); }
#news time { display: block; color: var(--green); font-weight: 700; font-size: 13px; margin-bottom: 6px; }
#news h3 { margin: 0 0 8px; font-size: 18px; color: var(--ink); }
#news p { margin: 0; color: var(--muted); font-size: 15px; }