:root {
  --bg: #f3efe6;
  --ink: #1c1915;
  --muted: #5f574e;
  --line: #ddd4c6;
  --card: #faf7f2;
  --hover: #fffdf9;
  --mark: #1a6243;
  --go-bg: #e7f3ec;
  --go-ink: #145538;
  --shadow: 0 10px 30px rgba(40, 28, 14, 0.06);
  --glow: rgba(31, 107, 74, 0.08);
  --skip-bg: #1c1915;
  --skip-ink: #faf7f2;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #141210;
  --ink: #f6f1e8;
  --muted: #cfc6ba;
  --line: #453d34;
  --card: #221e19;
  --hover: #2e2923;
  --mark: #9ee0bf;
  --go-bg: #1b3b2c;
  --go-ink: #e5f8ee;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --glow: rgba(158, 224, 191, 0.1);
  --skip-bg: #f6f1e8;
  --skip-ink: #141210;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 40% at 50% -10%, var(--glow), transparent 60%),
    var(--bg);
  font-family: Pretendard, "IBM Plex Sans KR", "Malgun Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

a { color: inherit; }

.skip {
  position: absolute;
  left: 16px;
  top: 8px;
  transform: translateY(-140%);
  background: var(--skip-bg);
  color: var(--skip-ink);
  padding: 8px 12px;
  border-radius: 8px;
  z-index: 2;
}

.skip:focus { transform: none; }

.top,
main,
footer {
  width: min(920px, calc(100% - 40px));
  margin-inline: auto;
}

.top { padding: 72px 0 28px; }

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.theme {
  display: inline-flex;
  flex-shrink: 0;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
}

.theme button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.theme button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--bg);
}

.theme button:focus-visible {
  outline: 2px solid var(--mark);
  outline-offset: 2px;
}

.eyebrow {
  margin: 0;
  color: var(--mark);
  font-size: 13px;
  font-weight: 600;
}

h1 {
  margin: 8px 0 0;
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.15;
}

.lead {
  max-width: 38rem;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.6;
}

.cats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}

.cats a {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.cats a:hover,
.cats a:focus-visible {
  border-color: var(--mark);
  color: var(--mark);
  outline: none;
}

main > section { scroll-margin-top: 24px; }

main > section + section { margin-top: 48px; }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  margin: 12px 0 8px;
}

.section-head h2,
.why h2 {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.accounts {
  list-style: none;
  margin: 0;
  padding: 8px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.accounts li + li { border-top: 1px solid var(--line); }

.account {
  display: grid;
  grid-template-columns: 42px minmax(0, 1.3fr) minmax(0, 1fr) auto;
  gap: 12px 18px;
  align-items: center;
  padding: 18px 14px;
  text-decoration: none;
  border-radius: 12px;
}

.account:hover,
.account:focus-visible {
  background: var(--hover);
  outline: none;
}

.account:focus-visible {
  box-shadow: inset 0 0 0 2px var(--mark);
}

.num {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 600;
}

.name {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.name strong {
  font-size: 20px;
  font-weight: 650;
  letter-spacing: -0.03em;
  line-height: 1.3;
}

.name span,
.handle {
  color: var(--muted);
  font-size: 14px;
}

.handle {
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.go {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  justify-self: end;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--go-bg);
  color: var(--go-ink);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.arrow {
  display: inline-block;
  transition: transform 160ms ease;
}

.account:hover .arrow,
.account:focus-visible .arrow { transform: translateX(3px); }

.why {
  margin-top: 48px;
}

.why ol {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.why li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px 16px;
  background: transparent;
  border-top: 2px solid var(--ink);
}

.why strong {
  font-size: 16px;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.why span {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

footer {
  padding: 36px 0 56px;
  color: var(--muted);
  font-size: 13px;
}

footer p { margin: 0; }

footer p + p { margin-top: 6px; }

@media (max-width: 720px) {
  .top { padding-top: 48px; }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .account {
    grid-template-columns: 32px minmax(0, 1fr);
    grid-template-areas:
      "num name"
      "num handle"
      "num go";
    gap: 4px 12px;
    padding: 16px 10px;
  }

  .num { grid-area: num; align-self: start; padding-top: 4px; }
  .name { grid-area: name; }
  .handle { grid-area: handle; }
  .go { grid-area: go; justify-self: start; margin-top: 8px; }

  .why ol { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .arrow { transition: none; }
}