:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5c667a;
  --line: #dfe4ec;
  --surface: #ffffff;
  --canvas: #f5f7fa;
  --accent: #2457d6;
  --accent-soft: #edf3ff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: Inter, Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}
a { color: var(--accent); }
img { max-width: 100%; height: auto; }
.public-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px max(20px, calc((100vw - 1120px) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.96);
}
.brand { color: var(--ink); font-weight: 800; text-decoration: none; }
.public-nav { display: flex; flex-wrap: wrap; gap: 16px; font-size: .94rem; }
.public-nav a { color: var(--muted); text-decoration: none; }
.public-main { width: min(1120px, calc(100% - 32px)); margin: 0 auto; padding: 56px 0 72px; }
.hero { max-width: 820px; margin-bottom: 48px; }
.eyebrow { color: var(--accent); font-weight: 750; letter-spacing: .04em; text-transform: uppercase; }
h1 { margin: 8px 0 16px; font-size: clamp(2.2rem, 6vw, 4.2rem); line-height: 1.08; letter-spacing: -.045em; }
h2 { margin: 0 0 12px; font-size: clamp(1.55rem, 3vw, 2.2rem); line-height: 1.2; }
h3 { margin: 0 0 8px; }
.lead { color: var(--muted); font-size: 1.1rem; }
.jump-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.jump-links a, .button {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}
.button.primary { border-color: var(--accent); background: var(--accent); color: white; }
.app-guide {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, .95fr);
  gap: 34px;
  margin: 0 0 28px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
}
.app-guide:nth-of-type(even) .app-shot { order: -1; }
.app-meta { color: var(--muted); font-size: .92rem; }
.feature-list { padding-left: 20px; }
.app-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.app-shot { align-self: center; margin: 0; }
.app-shot img { display: block; width: 100%; border: 1px solid var(--line); border-radius: 16px; background: #eef1f6; }
.app-shot figcaption { margin-top: 8px; color: var(--muted); font-size: .85rem; }
.info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 48px 0; }
.info-card { padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.faq { margin-top: 56px; }
.faq details { margin-bottom: 10px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.faq summary { cursor: pointer; font-weight: 750; }
.public-footer { padding: 28px max(20px, calc((100vw - 1120px) / 2)); border-top: 1px solid var(--line); background: white; color: var(--muted); }
.public-footer nav { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 8px; }
.policy-note { padding: 18px 20px; border-radius: 14px; background: var(--accent-soft); }
@media (max-width: 760px) {
  .public-header { align-items: flex-start; flex-direction: column; gap: 7px; padding: 12px 16px; }
  .public-nav { gap: 12px; overflow-x: auto; width: 100%; flex-wrap: nowrap; }
  .public-main { padding-top: 38px; }
  .app-guide { grid-template-columns: 1fr; padding: 22px; }
  .app-guide:nth-of-type(even) .app-shot { order: initial; }
  .info-grid { grid-template-columns: 1fr; }
}