:root {
  --ink: #17201a;
  --muted: #5d6b63;
  --line: #dfe6df;
  --paper: #f8faf6;
  --white: #ffffff;
  --green: #2f6b4f;
  --green-dark: #1f4d39;
  --sage: #dce9df;
  --amber: #b7792c;
  --blue: #3f6f8f;
  --shadow: 0 18px 50px rgba(23, 32, 26, 0.12);
  --radius: 8px;
  font-family: "Songti SC", "SimSun", "Noto Serif CJK SC", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(248, 250, 246, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.nav {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0;
  min-width: 170px;
}

.brand strong {
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: 0;
}

.brand span {
  color: var(--muted);
  font-size: 13px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  color: #33423a;
  font-size: 15px;
  white-space: nowrap;
}

.nav-links a {
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--green-dark);
  border-color: var(--green);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  border-radius: var(--radius);
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.hero {
  min-height: 620px;
  position: relative;
  display: grid;
  align-items: end;
  overflow: hidden;
  background: #18251d;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(12, 24, 17, 0.78), rgba(12, 24, 17, 0.52) 42%, rgba(12, 24, 17, 0.18)),
    var(--hero-image);
  background-size: cover, var(--hero-size, cover);
  background-position: center, var(--hero-position, center);
  background-repeat: no-repeat;
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
  padding: 120px 0 70px;
  color: var(--white);
}

.eyebrow {
  margin: 0 0 14px;
  color: #dce9df;
  font-size: 15px;
}

h1,
h2,
h3 {
  letter-spacing: 0;
  line-height: 1.25;
  margin: 0;
}

h1 {
  max-width: 760px;
  font-size: clamp(38px, 6vw, 76px);
}

.hero p {
  max-width: 680px;
  margin: 20px 0 0;
  color: #eef5ee;
  font-size: 19px;
}

.hero-actions,
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  background: var(--green);
  color: var(--white);
  font-weight: 700;
  font-size: 15px;
}

.button:hover {
  background: var(--green-dark);
}

.button.secondary {
  color: var(--white);
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.4);
}

.button.secondary:hover {
  background: rgba(255, 255, 255, 0.22);
}

.button.light {
  background: var(--white);
  color: var(--green-dark);
  border-color: var(--line);
}

.section {
  padding: 72px 0;
}

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

.wrap {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
}

.section-head {
  max-width: 820px;
  margin-bottom: 34px;
}

.section-head p {
  color: var(--muted);
  margin: 12px 0 0;
  font-size: 17px;
}

h2 {
  font-size: clamp(28px, 4vw, 44px);
}

h3 {
  font-size: 22px;
}

.grid {
  display: grid;
  gap: 18px;
}

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

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 28px rgba(23, 32, 26, 0.06);
}

.card-body {
  padding: 22px;
}

.card p,
.fact p,
.note p {
  color: var(--muted);
  margin: 8px 0 0;
}

.product-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  background: #eef3ed;
  padding: 18px;
}

.scene img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.kicker {
  color: var(--amber);
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 8px;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.fact {
  background: var(--sage);
  border: 1px solid #c6d6ca;
  border-radius: var(--radius);
  padding: 18px;
}

.fact strong {
  display: block;
  font-size: 24px;
  line-height: 1.25;
  color: var(--green-dark);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.86fr);
  gap: 38px;
  align-items: center;
}

.split img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.check-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 18px 0 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 22px;
  color: #314139;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 8px;
  height: 8px;
  background: var(--green);
  border-radius: 50%;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

th,
td {
  padding: 15px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #eef4ef;
  color: var(--green-dark);
}

tr:last-child td {
  border-bottom: 0;
}

.answer-block {
  margin: 24px 0;
  padding: 22px;
  border-left: 4px solid var(--green);
  background: #eef5ee;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.answer-block strong {
  display: block;
  margin-bottom: 6px;
  color: var(--green-dark);
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 18px 20px;
  border: 0;
  background: transparent;
  color: var(--ink);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.faq-answer {
  display: none;
  padding: 0 20px 20px;
  color: var(--muted);
}

.faq-item.is-open .faq-answer {
  display: block;
}

.notice {
  background: #fff8eb;
  border: 1px solid #efd8ad;
  border-radius: var(--radius);
  padding: 18px 20px;
  color: #6c4b19;
}

.footer {
  background: #18251d;
  color: #edf4ee;
  padding: 44px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.footer a,
.footer p {
  color: #cfdacf;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: flex-end;
}

.small {
  font-size: 13px;
  color: var(--muted);
}

.product-hero {
  min-height: 560px;
}

.product-hero::before {
  background-image:
    linear-gradient(90deg, rgba(12, 24, 17, 0.78), rgba(12, 24, 17, 0.4)),
    var(--hero-image);
}

.metric-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.metric {
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius);
  color: var(--white);
  font-weight: 700;
}

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    padding: 14px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: none;
    flex-direction: column;
    align-items: flex-start;
    white-space: normal;
  }

  .site-header.is-open .nav-links {
    display: flex;
  }

  .grid.two,
  .grid.three,
  .grid.four,
  .fact-grid,
  .split,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-links {
    justify-content: flex-start;
  }

  .hero {
    min-height: 560px;
  }

  .hero-content {
    padding: 90px 0 54px;
  }
}

@media (max-width: 560px) {
  .nav {
    width: min(100% - 24px, 1160px);
  }

  .brand strong {
    font-size: 20px;
  }

  .section {
    padding: 50px 0;
  }

  h1 {
    font-size: 38px;
  }

  .hero p {
    font-size: 17px;
  }

  .button {
    width: 100%;
  }
}