:root {
  color-scheme: light;
  --ink: #17202a;
  --muted: #66717c;
  --paper: #f3f5f7;
  --panel: #ffffff;
  --line: #d8dee6;
  --blue: #1a5fb4;
  --green: #16784e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
  font-family: ui-sans-serif, "PingFang SC", "Microsoft YaHei", sans-serif;
}

.shell {
  width: min(1040px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 42px 0 60px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 14px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(44px, 8vw, 96px);
  line-height: 0.9;
}

.hero p {
  max-width: 680px;
  color: var(--muted);
  line-height: 1.75;
}

.app {
  margin-top: 26px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 22px 70px rgb(23 32 42 / 0.14);
}

.tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--line);
  padding: 14px;
}

button {
  min-height: 40px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  padding: 9px 14px;
  font: inherit;
  font-weight: 900;
}

button.active {
  border-color: var(--blue);
  background: #e8f0ff;
  color: var(--blue);
}

.panel {
  display: grid;
  gap: 18px;
  min-height: 380px;
  padding: 22px;
  view-transition-name: demo-panel;
}

.summary {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
}

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

.card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 34px;
}

::view-transition-old(demo-panel),
::view-transition-new(demo-panel) {
  animation-duration: 320ms;
  animation-timing-function: cubic-bezier(0.2, 0, 0, 1);
}

@media (max-width: 760px) {
  .tabs,
  .summary {
    display: grid;
    grid-template-columns: 1fr;
  }
}