:root {
  --side: #1f1e1d;
  --bg: #2a2927;
  --card: #343331;
  --hover: rgba(255, 255, 255, .06);
  --sel: rgba(255, 255, 255, .09);
  --ink: #efeeeb;
  --muted: #a9a79f;
  --sep: rgba(255, 255, 255, .08);
  --well: rgba(255, 255, 255, .07);
  --seg: #454441;
  --accent: #15803d;
  --accent-text: #3ccb68;
  --serif: ui-serif, 'New York', Georgia, serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --side: #efede6;
    --bg: #fbfaf7;
    --card: #fff;
    --hover: rgba(40, 30, 10, .05);
    --sel: rgba(40, 30, 10, .08);
    --ink: #23221e;
    --muted: #6b6962;
    --sep: rgba(40, 30, 10, .1);
    --well: rgba(40, 30, 10, .07);
    --seg: #fff;
    --accent-text: #15803d;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--side);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
:focus-visible { outline: 2px solid var(--accent-text); outline-offset: 2px; }

.shell { display: flex; flex-wrap: wrap; min-height: 100vh; padding: 8px; padding-left: 0; }

.side {
  flex: 0 1 280px;
  max-width: 100%;
  padding: 6px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand { font-family: var(--serif); font-size: 19px; font-weight: 500; padding: 8px 10px 14px; }

.item { display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 0 10px; border-radius: 8px; }
.item:hover { background: var(--hover); }
.item-on { background: var(--sel); }
.item svg {
  flex: none;
  width: 18px;
  height: 18px;
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.main {
  flex: 999 1 560px;
  min-width: 0;
  min-height: calc(100vh - 16px);
  padding: 28px 32px 56px;
  background: var(--bg);
  border: 1px solid var(--sep);
  border-radius: 14px;
  box-shadow: 0 1px 6px rgba(0, 0, 0, .18);
}

.col { max-width: 760px; margin: 0 auto; }

.title {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-size: 34px;
  line-height: 1.15;
  font-weight: 500;
  letter-spacing: -.01em;
}

.seg { display: inline-flex; flex-wrap: wrap; gap: 2px; padding: 3px; border-radius: 10px; background: var(--well); margin-bottom: 22px; }

.seg-btn {
  position: relative;
  min-height: 36px;
  padding: 0 16px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: background .12s;
}
.seg-btn::after { content: ""; position: absolute; inset: -4px 0; }
.seg-on { background: var(--seg); box-shadow: 0 1px 3px rgba(0, 0, 0, .25); }

.list { list-style: none; margin: 0; padding: 0; background: var(--card); border: 1px solid var(--sep); border-radius: 12px; overflow: hidden; }

.step { display: flex; gap: 14px; padding: 14px 16px; }
.step + .step { box-shadow: inset 0 1px 0 var(--sep); }
.step h2 { margin: 2px 0; font-size: 16px; font-weight: 600; }
.step p { margin: 0; color: var(--muted); }
.step a { color: var(--accent-text); }

.num {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
}

@media (max-width: 860px) {
  .shell { padding: 0; align-content: flex-start; }
  .side { flex: 1 1 100%; }
  .main { min-height: 0; padding: 22px 16px 40px; border-radius: 14px 14px 0 0; }
}