:root {
  --bg: #f6f5ef;
  --ink: #23231f;
  --muted: #6b6a61;
  --line: #e2e0d6;
  --card: #ffffff;
  --blue: #2f6df6;
  --blue-ink: #ffffff;
  --radius: 16px;
  --phone-w: 236px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Segoe UI", Roboto, sans-serif;
  line-height: 1.7;
  font-size: 16px;
}

img { max-width: 100%; display: block; }

a { color: var(--blue); }

.wrap {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}

.hero {
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #fbfaf5 0%, var(--bg) 100%);
}

.eyebrow {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(30px, 6vw, 48px);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.lead {
  max-width: 720px;
  margin: 0 0 24px;
  font-size: clamp(15px, 2.4vw, 18px);
  color: #3c3b35;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 8px 0 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.08s ease, background 0.15s ease;
}

.btn:active { transform: translateY(1px); }

.btn.primary { background: var(--blue); color: var(--blue-ink); }
.btn.primary:hover { background: #2559d8; }

.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { background: #ffffff; }

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

.toc {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246, 245, 239, 0.92);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--line);
}

.toc-inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-top: 10px;
  padding-bottom: 10px;
  scrollbar-width: none;
}

.toc-inner::-webkit-scrollbar { display: none; }

.toc a {
  flex: 0 0 auto;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: #3c3b35;
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
}

.toc a:hover { border-color: var(--blue); color: var(--blue); }

.block {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 64px;
}

.block-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 12px;
}

.num {
  font-size: 14px;
  font-weight: 700;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.block h2 {
  margin: 0;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.desc {
  max-width: 760px;
  margin: 0 0 26px;
  font-size: clamp(15px, 2.2vw, 17px);
  color: #3c3b35;
}

/* Horizontal, phone-framed gallery: keeps the page short while showing
   full-height screenshots at a readable size. */
.gallery {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: var(--phone-w);
  gap: 18px;
  overflow-x: auto;
  padding: 6px 2px 18px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.gallery::after { content: ""; width: 2px; }

.gallery::-webkit-scrollbar { height: 8px; }
.gallery::-webkit-scrollbar-thumb { background: #cfcdc2; border-radius: 999px; }
.gallery::-webkit-scrollbar-track { background: transparent; }
.gallery { scrollbar-width: thin; scrollbar-color: #cfcdc2 transparent; }

.gallery-hint {
  margin: -14px 0 12px;
  font-size: 12.5px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.phone {
  margin: 0;
  scroll-snap-align: start;
  background: #111;
  border-radius: 26px;
  padding: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08), 0 12px 28px rgba(0, 0, 0, 0.10);
}

.phone img {
  width: 100%;
  height: auto;
  border-radius: 18px;
  background: #ecebe3;
}

.phone figcaption {
  padding: 8px 6px 4px;
  font-size: 12.5px;
  line-height: 1.4;
  color: #d7d6cf;
  text-align: center;
}

.summary { border-bottom: 0; }

.checklist {
  list-style: none;
  padding: 0;
  margin: 0 0 26px;
  display: grid;
  gap: 10px;
}

.checklist li {
  position: relative;
  padding-left: 30px;
  font-size: 16px;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--blue);
}

.checklist li::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 11px;
  width: 5px;
  height: 9px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.foot {
  padding: 40px 0 56px;
  background: #fbfaf5;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--muted);
}

.foot nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 10px 0 16px;
}

.foot .fine { font-size: 12px; color: #8a897f; }

@media (max-width: 640px) {
  :root { --phone-w: 200px; }
  .hero { padding: 44px 0 32px; }
  .block { padding: 40px 0; }
}

@media (min-width: 900px) {
  :root { --phone-w: 260px; }
}