/* Set 4 CN — first-run path: white canvas, emerald marks, centered hero circles */
:root {
  --green: #059669;
  --green-deep: #047857;
  --mint: #ecfdf5;
  --ink: #064e3b;
  --text: #134e4a;
  --muted: #3f6b63;
  --line: #bbf7d0;
  --card: #ffffff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "Avenir Next", "PingFang SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  background: #ffffff;
  color: var(--text);
  line-height: 1.72;
  font-size: 16.5px;
}

a { color: inherit; text-decoration: none; }
svg { display: block; }

.page { width: min(1000px, calc(100% - 28px)); margin: 0 auto; }

.masthead {
  background: var(--mint);
  border-bottom: 1px solid var(--line);
}

.mast-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--green-deep);
}

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 14px;
  font-size: 13.5px;
}

.links a {
  color: var(--muted);
  padding: 6px 0;
}

.links a:hover,
.links a:focus {
  color: var(--green);
}

.hero-center {
  text-align: center;
  padding: 48px 0 20px;
}

.hero-center h1 {
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.3;
  color: var(--ink);
  max-width: 16em;
  margin: 0 auto 16px;
}

.hero-center p {
  max-width: 40em;
  margin: 0 auto 10px;
  color: var(--muted);
}

.circles {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 28px;
  text-align: center;
}

.circles li {
  list-style: none;
}

.circles span {
  width: 64px;
  height: 64px;
  margin: 0 auto 10px;
  border-radius: 50%;
  background: var(--green);
  color: #ecfdf5;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
}

.circles b { display: block; color: var(--ink); font-size: 15px; }

.chunk { padding: 38px 0; }
.chunk h2 {
  font-size: clamp(21px, 2.3vw, 28px);
  color: var(--ink);
  line-height: 1.4;
  margin-bottom: 12px;
}
.note { color: var(--muted); max-width: 48em; margin-bottom: 20px; }

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

.prep article {
  background: var(--mint);
  padding: 22px 20px;
  border: 1px solid var(--line);
}

.prep h3 { color: var(--green-deep); margin-bottom: 10px; }
.prep ul { padding-left: 18px; color: var(--muted); }
.prep li { margin-bottom: 8px; }

.horizon {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}

.horizon::after {
  content: "";
  position: absolute;
  left: 6%;
  right: 6%;
  top: 22px;
  height: 3px;
  background: #a7f3d0;
}

.horizon article {
  padding: 0 10px;
  position: relative;
}

.horizon em {
  width: 18px;
  height: 18px;
  background: var(--green);
  border-radius: 50%;
  display: block;
  margin: 14px auto 16px;
  position: relative;
  z-index: 1;
  font-style: normal;
}

.horizon h3 { font-size: 16px; text-align: center; margin-bottom: 8px; }
.horizon p {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 12px;
  font-size: 14px;
  color: var(--muted);
}

.checks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

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

.checks h3 { font-size: 16px; color: var(--green-deep); margin-bottom: 8px; }
.checks p { font-size: 14.5px; color: var(--muted); }

.stuck {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.stuck article {
  background: var(--mint);
  padding: 18px 16px;
  min-height: 160px;
}

.stuck h3 { font-size: 16px; margin-bottom: 8px; }
.stuck p { font-size: 14.5px; color: var(--muted); }

.able {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.able article {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  border: 1px solid var(--line);
  padding: 16px;
}

.able .ico {
  width: 48px;
  height: 48px;
  background: var(--mint);
  color: var(--green-deep);
  display: flex;
  align-items: center;
  justify-content: center;
}

.able h3 { font-size: 16px; margin-bottom: 6px; }
.able p { font-size: 14px; color: var(--muted); }

.who {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.who article {
  background: var(--green-deep);
  color: #ecfdf5;
  padding: 20px 16px;
  min-height: 190px;
}

.who h3 { font-size: 16px; margin-bottom: 8px; }
.who p { font-size: 14px; }

.next-card {
  background: var(--mint);
  border-left: 8px solid var(--green);
  padding: 24px 22px;
}

.next-card h3 { color: var(--ink); margin-bottom: 10px; }
.next-card p { color: var(--muted); margin-bottom: 10px; }

.ask details {
  border-bottom: 1px solid var(--line);
  padding: 4px 0;
}

.ask summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--ink);
  padding: 12px 0;
}

.ask details p { color: var(--muted); padding-bottom: 12px; }

.bottom {
  background: #064e3b;
  color: #bbf7d0;
  padding: 30px 0 22px;
  font-size: 14px;
}

.bottom-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 14px;
}

.bottom h3 { color: #6ee7b7; font-size: 13px; margin-bottom: 6px; }
.legal { border-top: 1px solid #047857; padding-top: 12px; }

@media (max-width: 840px) {
  .circles,
  .prep,
  .horizon,
  .checks,
  .stuck,
  .able,
  .who,
  .bottom-grid,
  .mast-row { grid-template-columns: 1fr; }
  .horizon::after { display: none; }
  .mast-row { padding: 10px 0; }
  .hero-center { text-align: left; }
  .hero-center h1 { margin-left: 0; }
}