:root {
  /* Light theme, green ink: the product icon is a deep forest green (#2e6550) on white. */
  --bg: #ffffff;
  --bg-soft: #f4f8f5;
  --panel: #ffffff;
  --ink: #1c3f2e;
  --muted: #56735f;
  --line: rgba(28, 63, 46, 0.14);
  --accent: #2e6550;
  --accent-hover: #275744;
  --accent-soft: #e7f1ec;
  --radius: 16px;
  --wrap: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Noto Sans SC",
    "Hiragino Sans", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: min(100% - 40px, var(--wrap));
  margin-inline: auto;
}

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

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand img {
  border-radius: 8px;
  display: block;
}

.brand-name {
  font-size: 17px;
  color: var(--accent);
}

.nav {
  display: flex;
  gap: 22px;
  margin-left: 8px;
  font-size: 14px;
  color: var(--muted);
}

.nav a:hover {
  color: var(--accent);
}

.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 13px;
  font-family: inherit;
}

.lang:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

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

.btn-primary {
  background: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

/* hero */
.hero {
  padding: 88px 0 40px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -34% 26% auto -18%;
  height: 560px;
  background: radial-gradient(closest-side, rgba(46, 101, 80, 0.14), transparent 72%);
  filter: blur(18px);
  pointer-events: none;
}

.eyebrow {
  margin: 0 0 18px;
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}

.hero h1 {
  margin: 0;
  font-size: clamp(40px, 6.4vw, 76px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--ink);
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.lede {
  margin: 24px 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.5vw, 19px);
  color: var(--muted);
}

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

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  font-size: 13px;
  color: var(--muted);
}

.pills li {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 14px;
  background: var(--accent-soft);
  color: var(--accent);
}

/* hero visual (placeholder screen, no external assets) */
.hero-visual {
  margin-top: 56px;
}

.screen {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #ffffff;
  box-shadow: 0 30px 70px -50px rgba(28, 63, 46, 0.55);
  overflow: hidden;
}

.screen-bar {
  display: flex;
  gap: 6px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}

.screen-bar span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(28, 63, 46, 0.2);
}

.screen-body {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 260px;
}

.screen-side {
  border-right: 1px solid var(--line);
  padding: 18px;
  display: grid;
  gap: 12px;
  align-content: start;
  background: var(--bg-soft);
}

.screen-main {
  padding: 22px;
  display: grid;
  gap: 12px;
  align-content: start;
}

.sk {
  height: 10px;
  border-radius: 6px;
  background: rgba(28, 63, 46, 0.12);
}

.sk-title {
  width: 60%;
  height: 14px;
}

.sk-short {
  width: 45%;
}

.sk-line {
  height: 12px;
}

.chips {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  font-size: 12px;
  color: var(--accent);
}

.chips span {
  border: 1px solid rgba(46, 101, 80, 0.35);
  border-radius: 999px;
  padding: 4px 12px;
  background: var(--accent-soft);
}

/* sections */
.section {
  padding: 96px 0;
  border-top: 1px solid var(--line);
}

.section-alt {
  background: var(--bg-soft);
}

.section h2 {
  margin: 0;
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.section-lede {
  margin: 16px 0 0;
  max-width: 36em;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 16px;
  margin-top: 44px;
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  background: #ffffff;
  box-shadow: 0 20px 48px -44px rgba(28, 63, 46, 0.5);
}

.card-plain {
  background: transparent;
  box-shadow: none;
}

.card-num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 14px;
  font-weight: 600;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.5;
  color: var(--accent);
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
}

/* steps */
.steps {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.steps li {
  border-top: 2px solid var(--accent);
  padding-top: 18px;
}

.step-index {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
  font-weight: 600;
}

.steps h3 {
  margin: 8px 0 6px;
  font-size: 16px;
  color: var(--ink);
}

.steps p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.fineprint {
  margin: 34px 0 0;
  font-size: 13px;
  color: var(--muted);
}

/* faq */
.faq {
  margin-top: 36px;
  border-top: 1px solid var(--line);
}

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 4px 0;
}

.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 18px 0;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--ink);
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  color: var(--accent);
  font-weight: 400;
}

.faq details[open] summary::after {
  content: "–";
}

.faq p {
  margin: 0 0 18px;
  color: var(--muted);
  max-width: 62em;
}

/* cta band */
.cta-band {
  padding: 72px 0;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, var(--accent-soft), #ffffff);
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
}

.cta-inner h2 {
  margin: 0;
  font-size: clamp(24px, 2.8vw, 34px);
  line-height: 1.3;
  color: var(--ink);
}

.cta-inner p {
  margin: 10px 0 0;
  color: var(--muted);
}

/* footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  background: var(--bg-soft);
}

.footer-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted);
}

.footer-inner nav {
  display: flex;
  gap: 18px;
}

.footer-inner nav a:hover {
  color: var(--accent);
}

.copyright {
  margin: 0 0 0 auto;
}

@media (max-width: 900px) {
  .nav {
    display: none;
  }

  .grid-4,
  .grid-3,
  .steps {
    grid-template-columns: 1fr 1fr;
  }

  .screen-body {
    grid-template-columns: 1fr;
  }

  .screen-side {
    display: none;
  }
}

@media (max-width: 600px) {
  .hero {
    padding-top: 56px;
  }

  .grid-4,
  .grid-3,
  .steps {
    grid-template-columns: 1fr;
  }

  .header-actions .btn {
    display: none;
  }
}