:root {
  --bg: #E8EEF4;
  --ink: #1B2833;
  --muted: #5A6B78;
  --header: #2C3E50;
  --step: #3A7CA5;
  --step-soft: #D6E6F0;
  --card: #FFFFFF;
  --line: #C9D4DE;
  --warn: #A65B2B;
  --ok: #2F6B4F;
}

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

html {
  scroll-behavior: auto;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Trebuchet MS", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  font-size: 16px;
}

img,
svg {
  display: block;
}

a {
  color: var(--step);
  text-decoration: none;
}

.wrap {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  background: var(--header);
  color: #F4F7FA;
  width: 100%;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #F4F7FA;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brand svg {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  justify-content: flex-end;
}

.nav a {
  color: #D5DEE6;
  font-size: 14px;
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
}

.nav a:hover,
.nav a:focus {
  color: #FFFFFF;
  border-bottom-color: #7EB6D4;
}

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

.hero h1 {
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1.25;
  margin-bottom: 12px;
}

.hero p {
  max-width: 46em;
  color: var(--muted);
  margin-bottom: 8px;
}

.section {
  padding: 28px 0;
}

.section h2 {
  font-size: 24px;
  margin-bottom: 16px;
}

.lead {
  color: var(--muted);
  margin-bottom: 18px;
  max-width: 48em;
}

.steps-bar {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  margin-top: 8px;
}

.step-node {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 12px 18px;
  text-align: center;
}

.step-dot {
  width: 42px;
  height: 42px;
  margin: 0 auto 10px;
  border-radius: 50%;
  background: var(--step);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.step-node h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.step-node p {
  font-size: 14px;
  color: var(--muted);
}

.cards-3,
.cards-4 {
  display: grid;
  gap: 16px;
}

.cards-3 {
  grid-template-columns: repeat(3, 1fr);
}

.cards-4 {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 16px;
}

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

.card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.card p,
.card li {
  font-size: 15px;
  color: #32414C;
}

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

.card li + li {
  margin-top: 6px;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
}

.panel.keep {
  border-top: 4px solid var(--ok);
}

.panel.leave {
  border-top: 4px solid var(--warn);
}

.panel h3 {
  margin-bottom: 10px;
}

.panel p + p {
  margin-top: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid var(--line);
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  font-size: 15px;
}

th {
  background: var(--step-soft);
  color: var(--ink);
}

.checklist {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 8px 20px 16px;
}

.checklist li {
  list-style: none;
  padding: 12px 0 12px 28px;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.checklist li:last-child {
  border-bottom: 0;
}

.checklist li::before {
  content: "";
  width: 14px;
  height: 14px;
  border: 2px solid var(--step);
  border-radius: 3px;
  position: absolute;
  left: 0;
  top: 16px;
}

.bound {
  background: #F7FBFD;
  border: 1px dashed var(--step);
  border-radius: 12px;
  padding: 18px 20px;
}

.bound p + p {
  margin-top: 8px;
}

.faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 10px;
}

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

.faq details p {
  margin-top: 8px;
  color: #32414C;
}

.site-footer {
  background: var(--header);
  color: #D7E0E8;
  padding: 28px 0 32px;
  margin-top: 20px;
  font-size: 14px;
}

.site-footer p + p {
  margin-top: 8px;
}

@media (max-width: 960px) {
  .steps-bar,
  .cards-3,
  .cards-4,
  .split {
    grid-template-columns: 1fr;
  }

  .site-header .wrap {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 0;
  }

  .nav {
    justify-content: flex-start;
  }
}