:root {
  --slate: #334155;
  --slate-deep: #1e293b;
  --ink: #0f172a;
  --cyan: #22d3ee;
  --cyan-dim: #155e75;
  --paper: #e2e8f0;
  --muted: #94a3b8;
  --line: #475569;
  --card: #334155;
  --danger: #fda4af;
}

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

html {
  scroll-behavior: auto;
}

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--ink);
  color: var(--paper);
  line-height: 1.7;
  min-height: 100vh;
}

img,
svg {
  display: block;
}

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

a:hover {
  text-decoration: underline;
}

.wrap {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  background: var(--ink);
  border-bottom: 3px solid var(--cyan);
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
}

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

.brand svg {
  width: 28px;
  height: 28px;
  color: var(--cyan);
}

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

.nav a {
  color: var(--paper);
  font-size: 14px;
}

.hero {
  padding: 48px 0 28px;
  border-bottom: 1px solid var(--line);
}

.hero-panel {
  border-left: 6px solid var(--cyan);
  background: var(--slate);
  padding: 28px 32px;
}

.hero h1 {
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.35;
  margin-bottom: 16px;
  color: #fff;
}

.hero p {
  max-width: 46em;
  margin-bottom: 10px;
  color: var(--paper);
}

.hero p:last-child {
  margin-bottom: 0;
}

.section {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

.section h2 {
  font-size: 24px;
  line-height: 1.4;
  margin-bottom: 20px;
  color: #fff;
}

.lead {
  margin-bottom: 18px;
  color: var(--paper);
}

.timeline {
  position: relative;
  padding-left: 36px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--cyan);
}

.tl-item {
  position: relative;
  margin-bottom: 18px;
  background: var(--slate);
  padding: 16px 18px;
}

.tl-item:last-child {
  margin-bottom: 0;
}

.tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 20px;
  width: 14px;
  height: 14px;
  background: var(--ink);
  border: 3px solid var(--cyan);
  border-radius: 50%;
}

.tl-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.tl-kicker svg {
  width: 16px;
  height: 16px;
}

.tl-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

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

.table-scroll {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--slate-deep);
  font-size: 15px;
}

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

th {
  background: var(--cyan-dim);
  color: #fff;
  font-weight: 700;
}

.steps {
  display: grid;
  gap: 12px;
}

.step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  background: var(--slate);
  padding: 14px 16px;
  align-items: start;
}

.step-num {
  width: 48px;
  height: 48px;
  background: var(--ink);
  color: var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 20px;
  border: 2px solid var(--cyan);
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.card {
  background: var(--slate);
  padding: 16px;
  border-top: 3px solid var(--cyan);
}

.card h3 {
  font-size: 17px;
  margin: 10px 0;
}

.card svg {
  width: 22px;
  height: 22px;
  color: var(--cyan);
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.panel {
  background: var(--slate);
  padding: 18px;
}

.panel h3 {
  margin-bottom: 10px;
  font-size: 18px;
}

.list {
  padding-left: 18px;
}

.list li {
  margin-bottom: 8px;
}

.note {
  margin-top: 14px;
  padding: 12px 14px;
  background: var(--slate-deep);
  border-left: 3px solid var(--cyan);
}

.faq details {
  background: var(--slate);
  border: 1px solid var(--line);
  margin-bottom: 10px;
}

.faq summary {
  cursor: pointer;
  padding: 14px 16px;
  font-weight: 700;
  list-style: none;
}

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

.faq summary::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  margin-right: 10px;
}

.faq details p {
  padding: 0 16px 14px;
  color: var(--paper);
}

.faq details p + p {
  padding-top: 0;
  margin-top: -6px;
}

.site-footer {
  background: #020617;
  color: var(--muted);
  padding: 28px 0 36px;
  font-size: 14px;
}

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

@media (max-width: 860px) {
  .header-row {
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 0;
  }

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

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