:root {
  --paper: #faf9f6;
  --white: #fff;
  --ink: #12243b;
  --body: #48566a;
  --line: #d8dee5;
  --blue: #075ac8;
  --pale: #eaf1fc;
  --navy: #122d51;
  --muted: #586577;
  --green: #167051;
  --radius: 14px;
  --font: "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scrollbar-color: #a7b7ca var(--paper);
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.7 var(--font);
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: #cdf;
  color: var(--ink);
}

a {
  color: inherit;
  text-decoration: none;
  text-underline-offset: 5px;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1,
h2,
h3 {
  font-weight: 650;
  line-height: 1.24;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

h1 {
  font-size: 64px;
  max-width: 900px;
}

h2 {
  font-size: 40px;
}

h3 {
  font-size: 24px;
}

p {
  color: var(--body);
}

.wrap {
  width: min(1200px, calc(100% - 96px));
  margin-inline: auto;
}

.skip {
  position: fixed;
  left: 20px;
  top: -100px;
  background: white;
  padding: 10px;
  z-index: 100;
}

.skip:focus {
  top: 20px;
}

svg {
  width: 20px;
  height: 20px;
  flex: none;
  fill: none;
  stroke: currentcolor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.question-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--blue);
  margin-bottom: 14px;
}

details {
  border-top: 1px solid var(--line);
  padding: 20px 0;
}

details:last-child {
  border-bottom: 1px solid var(--line);
}

summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-size: 18px;
  font-weight: 550;
  min-height: 44px;
}

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

summary svg {
  transition: transform 0.18s;
}

details[open] summary svg {
  transform: rotate(45deg);
}

details p {
  font-size: 15px;
  padding: 14px 36px 6px 0;
}

.english .intro {
  font-size: 18px;
}

.stage-2 .question-label {
  color: var(--muted);
}

.stage-1 {
  min-height: 360px;
}

main:focus {
  outline: none;
}

[hidden] {
  display: none !important;
}