:root {
  --purple: #6D28D9;
  --purple-deep: #4C1D95;
  --purple-mid: #7C3AED;
  --purple-soft: #EDE9FE;
  --purple-wash: #F5F3FF;
  --ink: #1E1B4B;
  --muted: #5B5678;
  --card: #FFFFFF;
  --line: #DDD6FE;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--purple-wash);
  line-height: 1.75;
}

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

a:hover {
  text-decoration: underline;
}

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

.site-header {
  background: var(--purple);
  color: #F8F5FF;
  position: sticky;
  top: 0;
  z-index: 20;
  box-shadow: 0 8px 24px rgba(109, 40, 217, 0.28);
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  padding: 14px 0;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.04em;
}

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
}

.site-header nav a {
  color: #F8F5FF;
  font-size: 14px;
}

.hero {
  padding: 48px 0 28px;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.35;
  color: var(--purple-deep);
}

.hero p {
  margin: 0;
  max-width: 46em;
  color: var(--muted);
}

.ladder-board {
  margin: 8px 0 40px;
  padding: 28px 24px;
  background: linear-gradient(180deg, #FFFFFF 0%, var(--purple-soft) 100%);
  border: 1px solid var(--line);
  border-radius: 8px 28px 8px 28px;
}

.ladder-board h3 {
  margin: 0 0 8px;
  font-size: 22px;
  color: var(--purple-deep);
}

.cost-ladder {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.cost-ladder li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  align-items: stretch;
  background: var(--card);
  border-left: 8px solid var(--purple);
  padding: 16px 18px;
  box-shadow: 8px 8px 0 var(--purple-soft);
}

.cost-ladder li:nth-child(1) { margin-left: 0; border-left-color: #C4B5FD; }
.cost-ladder li:nth-child(2) { margin-left: 28px; border-left-color: #A78BFA; }
.cost-ladder li:nth-child(3) { margin-left: 56px; border-left-color: #8B5CF6; }
.cost-ladder li:nth-child(4) { margin-left: 84px; border-left-color: #7C3AED; }
.cost-ladder li:nth-child(5) { margin-left: 112px; border-left-color: #6D28D9; }

.cost-ladder .rung {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--purple-wash);
  color: var(--purple-deep);
  font-weight: 800;
}

.cost-ladder .rung b {
  font-size: 28px;
  line-height: 1;
}

.cost-ladder .rung span {
  font-size: 12px;
  letter-spacing: 0.08em;
}

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

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

section {
  margin: 0 0 48px;
}

section h2 {
  margin: 0 0 14px;
  font-size: 24px;
  line-height: 1.4;
  color: var(--purple-deep);
}

.card-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 20px 0;
}

.svg-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  min-height: 220px;
}

.svg-card svg {
  display: block;
  width: 100%;
  height: 110px;
}

.svg-card h3 {
  margin: 12px 0 6px;
  font-size: 16px;
}

.svg-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

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

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 18px 20px;
}

.panel h3 {
  margin: 0 0 8px;
  color: var(--purple);
}

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

.steps li {
  counter-increment: step;
  position: relative;
  padding: 12px 0 12px 52px;
  border-bottom: 1px dashed var(--line);
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 12px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--purple);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
}

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

th, td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--purple-soft);
  color: var(--purple-deep);
}

.faq dt {
  font-weight: 700;
  margin: 18px 0 6px;
  color: var(--purple-deep);
}

.faq dd {
  margin: 0;
  color: var(--muted);
}

.site-footer {
  background: var(--purple-deep);
  color: #DDD6FE;
  padding: 28px 0 36px;
  font-size: 14px;
}

.site-footer p {
  margin: 0 0 10px;
}

@media (max-width: 900px) {
  .cost-ladder li,
  .cost-ladder li:nth-child(n) {
    margin-left: 0;
    grid-template-columns: 56px 1fr;
  }

  .card-row,
  .two-col {
    grid-template-columns: 1fr;
  }
}