:root {
  --bg: #f5f0e7;
  --bg-soft: #fcf8f0;
  --ink: #1d271f;
  --muted: #667166;
  --line: rgba(29, 39, 31, 0.12);
  --card: rgba(255, 252, 246, 0.84);
  --green: #1f6b4d;
  --green-soft: #dff0e5;
  --orange: #c96d36;
  --orange-soft: #f8e3d6;
  --shadow: 0 16px 40px rgba(31, 45, 35, 0.08);
  --font: "Space Grotesk", "Noto Sans JP", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(201, 109, 54, 0.12), transparent 28rem),
    radial-gradient(circle at bottom right, rgba(31, 107, 77, 0.14), transparent 32rem),
    var(--bg);
}

a { color: inherit; }
.bg-orb {
  position: fixed;
  z-index: -1;
  width: 28rem;
  height: 28rem;
  border-radius: 999px;
  filter: blur(28px);
  opacity: .35;
}
.orb-a { top: -10rem; right: -8rem; background: #d9f0e1; }
.orb-b { bottom: -12rem; left: -8rem; background: #ffe3d0; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  backdrop-filter: blur(14px);
  background: rgba(245, 240, 231, 0.84);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .85rem;
  text-decoration: none;
  font-weight: 700;
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: .8rem;
  background: linear-gradient(135deg, var(--green), var(--orange));
  color: white;
}
.nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.lang-switch {
  display: inline-flex;
  gap: .35rem;
  padding: .25rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.5);
}
.lang-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: .82rem;
  font-weight: 700;
  padding: .45rem .7rem;
  border-radius: 999px;
  cursor: pointer;
}
.lang-btn.is-active {
  background: var(--green);
  color: white;
}
.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: .95rem;
}

main {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}
.hero {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 1.5rem;
  padding: 4.5rem 0 2.5rem;
}
.eyebrow {
  margin: 0 0 .75rem;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: .78rem;
  font-weight: 700;
}
.hero h1 {
  margin: 0;
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  line-height: .95;
  max-width: 11ch;
}
.lede {
  max-width: 56ch;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}
.hero-actions {
  display: flex;
  gap: .8rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .9rem 1.2rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
}
.btn-primary {
  background: var(--green);
  color: white;
}
.btn-secondary {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.55);
}

.hero-panel {
  display: grid;
  gap: 1rem;
}
.panel-card, .feature-card, .crop-card, .device-card, .doc-card {
  background: var(--card);
  border: 1px solid rgba(255,255,255,.55);
  box-shadow: var(--shadow);
  border-radius: 1.4rem;
}
.panel-card {
  padding: 1.25rem;
}
.panel-card.accent {
  background: linear-gradient(180deg, rgba(31, 107, 77, 0.10), rgba(255,255,255,.72));
}
.panel-label {
  margin: 0 0 .7rem;
  color: var(--muted);
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .08em;
}
.panel-list {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--ink);
}
.panel-list li + li { margin-top: .5rem; }

.section {
  padding: 2.5rem 0;
}
.section-head h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 3rem);
  max-width: 16ch;
}

.grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.25rem;
}
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.feature-card, .crop-card, .device-card, .doc-card {
  padding: 1.2rem;
}
.feature-card h3, .crop-card h3, .device-card h3, .doc-card h3 {
  margin: 0 0 .55rem;
  font-size: 1.15rem;
}
.feature-card p, .crop-card p, .device-card p {
  margin: 0;
  color: var(--muted);
}

.crop-state {
  display: inline-block;
  margin-bottom: .7rem;
  padding: .28rem .56rem;
  border-radius: 999px;
  font-size: .74rem;
  font-weight: 700;
  background: var(--orange-soft);
  color: var(--orange);
}
.crop-card.active .crop-state {
  background: var(--green-soft);
  color: var(--green);
}

.device-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.25rem;
}
.device-card a, .doc-card a {
  color: var(--green);
  font-weight: 700;
  text-decoration: none;
}
.doc-card ul {
  margin: .25rem 0 0;
  padding-left: 1.1rem;
}
.doc-card li + li { margin-top: .5rem; }

.footer {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
  color: var(--muted);
}
.footer p { margin: 0; }
.footer-sub { margin-top: .35rem; font-size: .95rem; }

@media (max-width: 900px) {
  .hero,
  .grid.three,
  .grid.four,
  .grid.two,
  .device-layout {
    grid-template-columns: 1fr;
  }
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: .75rem;
  }
  .lang-switch {
    align-self: flex-start;
  }
}