:root {
  color-scheme: light;
  --paper: #fffaf3;
  --surface: #ffffff;
  --ink: #262626;
  --muted: #6f6a61;
  --line: #e9ded1;
  --sage: #788f59;
  --sage-dark: #52663d;
  --coral: #ef7d6c;
  --gold: #dcae42;
  --sky: #7ba5b7;
  --shadow: 0 24px 60px rgba(59, 46, 28, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Hiragino Sans",
    "Noto Sans JP",
    sans-serif;
  line-height: 1.7;
  letter-spacing: 0;
  background:
    linear-gradient(135deg, rgba(239, 125, 108, 0.12), transparent 34%),
    linear-gradient(220deg, rgba(120, 143, 89, 0.16), transparent 38%),
    var(--paper);
}

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

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(233, 222, 209, 0.82);
  background: rgba(255, 250, 243, 0.88);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 36px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: var(--surface);
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 10px 22px rgba(239, 125, 108, 0.28);
}

.site-nav {
  display: flex;
  gap: clamp(14px, 3vw, 34px);
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 700;
}

.site-nav a {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
}

.site-nav a:hover {
  color: var(--sage-dark);
}

.hero {
  display: grid;
  grid-template-columns: minmax(280px, 0.72fr) minmax(420px, 1.28fr);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  min-height: calc(88svh - 73px);
  padding: clamp(44px, 7vw, 92px) clamp(20px, 5vw, 72px) clamp(22px, 4vw, 52px);
}

.hero-copy {
  max-width: 580px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--sage-dark);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(3.8rem, 7.8vw, 7rem);
  line-height: 0.95;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(2rem, 4.2vw, 4rem);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.45;
}

.lead {
  max-width: 34rem;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.6vw, 1.28rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 800;
}

.primary-button {
  color: var(--surface);
  background: var(--sage);
  box-shadow: 0 16px 28px rgba(82, 102, 61, 0.24);
}

.secondary-button {
  color: var(--sage-dark);
  border: 1px solid rgba(82, 102, 61, 0.28);
  background: rgba(255, 255, 255, 0.58);
}

.hero-visual,
.wide-visual {
  margin: 0;
}

.hero-visual img,
.wide-visual img {
  width: 100%;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.intro {
  padding: clamp(28px, 5vw, 56px) clamp(20px, 5vw, 72px);
  background: var(--ink);
}

.intro p {
  max-width: 980px;
  margin: 0 auto;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(1.18rem, 2.3vw, 2rem);
  font-weight: 700;
  line-height: 1.75;
}

.section {
  padding: clamp(72px, 9vw, 128px) clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: clamp(28px, 5vw, 48px);
}

.section-heading p:not(.eyebrow) {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.feature-card {
  min-height: 260px;
  padding: 26px;
  border: 1px solid rgba(233, 222, 209, 0.9);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 16px 36px rgba(59, 46, 28, 0.08);
}

.feature-icon {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  margin-bottom: 22px;
  color: var(--surface);
  border-radius: 50%;
  background: var(--sage);
  font-size: 1.3rem;
  font-weight: 800;
}

.feature-card:nth-child(2) .feature-icon {
  background: var(--sky);
}

.feature-card:nth-child(3) .feature-icon {
  background: var(--gold);
}

.feature-card:nth-child(4) .feature-icon {
  background: var(--coral);
}

.feature-card p {
  margin: 12px 0 0;
  color: var(--muted);
}

.device-section {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.8), rgba(255, 250, 243, 0.92)),
    #f7fbf8;
}

.wide-visual {
  margin-top: 10px;
}

.flow-section {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(320px, 1.2fr);
  gap: clamp(28px, 7vw, 96px);
  align-items: start;
}

.flow-list {
  display: grid;
  gap: 16px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.flow-list li {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
}

.flow-list span {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  color: var(--surface);
  border-radius: 50%;
  background: var(--ink);
  font-weight: 900;
}

.flow-list p {
  margin: 8px 0 0;
  color: var(--muted);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(20px, 5vw, 72px);
  color: rgba(255, 255, 255, 0.72);
  background: var(--ink);
}

.site-footer p {
  margin: 0;
}

.site-footer p:first-child {
  color: var(--surface);
  font-weight: 900;
}

@media (max-width: 1040px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 760px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .flow-section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .site-nav {
    width: 100%;
    justify-content: space-between;
    gap: 8px;
    font-size: 0.86rem;
  }

  .hero {
    min-height: auto;
    padding-top: 38px;
  }

  h1 {
    font-size: clamp(3.2rem, 16vw, 5rem);
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .feature-card {
    min-height: auto;
  }

  .flow-list li {
    grid-template-columns: 40px minmax(0, 1fr);
    padding: 18px;
  }

  .flow-list span {
    width: 40px;
    height: 40px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}