:root {
  --ink: #263039;
  --muted: #68757d;
  --line: #dce8ec;
  --paper: #f6fbfc;
  --white: #ffffff;
  --blue: #84c4d3;
  --blue-soft: #d7f0f4;
  --green: #bde3cf;
  --orange: #f4b860;
  --pink: #efc5d3;
  --shadow: 0 22px 64px rgba(38, 48, 57, .16);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  letter-spacing: 0;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 12px clamp(18px, 4vw, 56px);
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid rgba(220,232,236,.9);
  backdrop-filter: blur(14px);
}
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 900; }
.brand img { border-radius: 14px; box-shadow: 0 10px 24px rgba(38,48,57,.18); }
.nav { display: flex; gap: clamp(12px,2.4vw,28px); color: var(--muted); font-size: 14px; font-weight: 800; }
.nav a:hover { color: var(--ink); }
.hero {
  position: relative;
  min-height: min(760px, calc(100vh - 24px));
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: #1f2a31;
}
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  opacity: .66;
  filter: saturate(.98) contrast(1.02);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(23,31,37,.90), rgba(23,31,37,.45) 56%, rgba(23,31,37,.12));
}
.hero-copy {
  position: relative;
  z-index: 1;
  width: min(760px, calc(100% - 32px));
  margin: 0 clamp(18px, 6vw, 82px) clamp(70px, 12vh, 138px);
  color: var(--white);
}
.eyebrow,.label {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: #315767;
  font-size: 13px;
  font-weight: 900;
}
.hero .eyebrow { background: rgba(215,240,244,.94); }
h1,h2,h3,p { margin: 0; }
h1 { margin-top: 18px; font-size: clamp(42px, 8vw, 96px); line-height: .96; }
h2 { margin-top: 14px; font-size: clamp(30px, 5vw, 58px); line-height: 1.12; }
h3 { margin-top: 14px; margin-bottom: 12px; font-size: clamp(22px, 3vw, 31px); line-height: 1.25; }
.lead { width: min(680px,100%); margin-top: 24px; color: rgba(255,255,255,.88); font-size: clamp(17px,2.2vw,23px); line-height: 1.8; font-weight: 800; }
.hero-actions,.download-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 900;
  box-shadow: 0 8px 0 rgba(38,48,57,.2);
}
.button:hover { transform: translateY(1px); box-shadow: 0 6px 0 rgba(38,48,57,.2); }
.primary { background: var(--orange); color: #2f2b25; }
.secondary { background: var(--white); color: var(--ink); }
.large { min-height: 56px; padding-inline: 28px; }
.intro,.workflow,.download,.overlay-section,.privacy { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.intro { display: grid; grid-template-columns: minmax(260px,.9fr) minmax(280px,1.1fr); gap: clamp(30px,6vw,80px); padding: 86px 0 62px; align-items: start; }
.intro p,.workflow p,.download p,.notes p,.privacy p,.features p,.overlay-section p { color: var(--muted); font-size: 16px; line-height: 1.9; font-weight: 700; }
.features { width: min(1120px, calc(100% - 32px)); margin: 0 auto; display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 18px; padding-bottom: 72px; }
.features article,.note-grid article { min-height: 250px; padding: clamp(22px,4vw,38px); background: var(--white); border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 12px 30px rgba(38,48,57,.07); }
.features article:nth-child(4n + 1) { background: #fff; }
.features article:nth-child(4n + 2) { background: #f2faf4; }
.features article:nth-child(4n + 3) { background: #fff8e1; }
.features article:nth-child(4n) { background: #fef4f7; }
.features .with-image { grid-row: span 2; }
.number { display: block; color: var(--orange); font-size: 15px; font-weight: 900; }
.feature-image { width: 100%; margin-top: 24px; border-radius: 8px; border: 1px solid rgba(38,48,57,.1); box-shadow: var(--shadow); }
.overlay-section { display: grid; grid-template-columns: minmax(280px,.9fr) minmax(260px,1fr); gap: clamp(28px,5vw,70px); align-items: center; padding: 74px 0; border-top: 1px solid var(--line); }
.overlay-preview { padding: clamp(28px,5vw,52px); background: #dfead7; border-radius: 8px; box-shadow: var(--shadow); }
.overlay-preview img { width: min(420px, 100%); image-rendering: auto; }
.workflow { display: grid; grid-template-columns: minmax(280px,.9fr) minmax(280px,1.1fr); gap: clamp(28px,5vw,70px); padding: 72px 0; border-top: 1px solid var(--line); }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.steps li { display: flex; align-items: center; gap: 16px; min-height: 76px; padding: 18px; background: var(--white); border: 1px solid var(--line); border-radius: 8px; font-weight: 900; }
.steps span { display: grid; place-items: center; width: 42px; height: 42px; flex: 0 0 42px; border-radius: 50%; background: var(--blue); color: var(--white); }
.download { display: flex; align-items: center; justify-content: space-between; gap: 28px; padding: clamp(30px,5vw,52px); background: #25313a; color: var(--white); border-radius: 8px; }
.download div:first-child { display: grid; grid-template-columns: 76px minmax(0,1fr); gap: 18px; align-items: center; }
.download img { border-radius: 18px; box-shadow: 0 10px 24px rgba(0,0,0,.28); }
.download h2 { margin: 0; color: var(--white); font-size: clamp(24px,4vw,42px); }
.download p { grid-column: 2; color: rgba(255,255,255,.74); }
.notes,.privacy { padding: 82px 0; }
.section-head { width: min(780px,100%); margin-bottom: 28px; }
.note-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 18px; }
.site-footer { display: flex; justify-content: space-between; gap: 18px; padding: 30px clamp(18px,4vw,56px); background: #25313a; color: rgba(255,255,255,.76); font-weight: 800; }
@media (max-width: 860px) {
  .site-header,.site-footer { align-items: flex-start; flex-direction: column; }
  .nav { width: 100%; overflow-x: auto; padding-bottom: 4px; }
  .hero { min-height: 720px; }
  .hero::after { background: linear-gradient(180deg, rgba(23,31,37,.50), rgba(23,31,37,.92)); }
  .hero-copy { margin-inline: 18px; margin-bottom: 56px; }
  .intro,.workflow,.features,.note-grid,.overlay-section { grid-template-columns: 1fr; }
  .features .with-image { grid-row: span 1; }
  .download,.download div:first-child { display: block; }
  .download img,.download h2,.download p { margin-bottom: 16px; }
}