:root {
  --ink: #172026;
  --muted: #5a6670;
  --line: #dde4e8;
  --paper: #f7f9fa;
  --white: #ffffff;
  --steel: #465762;
  --green: #16835b;
  --green-dark: #0f6043;
  --amber: #c77822;
  --shadow: 0 18px 50px rgba(23, 32, 38, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(210px, 1fr) auto auto;
  align-items: center;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  place-items: center;
  color: var(--white);
  font-weight: 800;
  background: var(--green);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 16px;
  line-height: 1.2;
}

.brand small {
  color: var(--muted);
  font-size: 12px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--steel);
  font-size: 14px;
  font-weight: 700;
}

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

.language-switcher {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--line);
  background: var(--paper);
}

.lang-btn {
  display: inline-flex;
  min-width: 46px;
  min-height: 34px;
  align-items: center;
  justify-content: center;
  border: 0;
  color: var(--steel);
  background: transparent;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.lang-btn.active {
  color: var(--white);
  background: var(--green);
}

.hero {
  position: relative;
  min-height: 720px;
  display: grid;
  align-items: center;
  padding: 84px clamp(18px, 5vw, 72px);
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media::after {
  position: absolute;
  inset: 0;
  content: "";
  background:
    linear-gradient(90deg, rgba(12, 22, 28, 0.84) 0%, rgba(12, 22, 28, 0.58) 43%, rgba(12, 22, 28, 0.10) 100%),
    linear-gradient(0deg, rgba(12, 22, 28, 0.20), rgba(12, 22, 28, 0.20));
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(760px, 100%);
  color: var(--white);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #a4f2cf;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(40px, 6vw, 74px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-lede {
  max-width: 660px;
  margin-bottom: 32px;
  color: rgba(255, 255, 255, 0.90);
  font-size: 19px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 34px;
}

.btn {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-weight: 900;
  border: 1px solid transparent;
}

.btn.primary {
  color: var(--white);
  background: var(--green);
}

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

.btn.secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.08);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  width: min(720px, 100%);
  margin: 0;
  background: rgba(255, 255, 255, 0.25);
  box-shadow: var(--shadow);
}

.hero-stats div {
  padding: 18px;
  background: rgba(255, 255, 255, 0.92);
}

.hero-stats dt {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.hero-stats dd {
  margin: 0;
  color: var(--ink);
  font-size: 18px;
  font-weight: 900;
  line-height: 1.25;
}

.notice-band {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 18px clamp(18px, 5vw, 72px);
  color: #3a250c;
  background: #fff1dc;
  border-top: 1px solid #f2d5aa;
  border-bottom: 1px solid #f2d5aa;
}

.notice-band strong {
  color: #8f4d0c;
}

.section {
  padding: 86px clamp(18px, 5vw, 72px);
}

.section-heading {
  max-width: 780px;
  margin-bottom: 34px;
}

.section-heading h2,
.contact-section h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.12;
  letter-spacing: 0;
}

.section-heading p:not(.eyebrow),
.contact-section p:not(.eyebrow) {
  color: var(--muted);
  font-size: 18px;
}

.product-section,
.process-section {
  background: var(--paper);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  min-height: 245px;
  padding: 26px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.feature-icon {
  display: inline-grid;
  width: 46px;
  height: 46px;
  margin-bottom: 24px;
  place-items: center;
  color: var(--green);
  font-weight: 900;
  background: #dff3ea;
}

.feature-card h3,
.term-item h3 {
  margin-bottom: 8px;
  font-size: 21px;
  line-height: 1.25;
}

.feature-card p,
.term-item p,
.process-list p {
  color: var(--muted);
}

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

.terms-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) minmax(320px, 1.2fr);
  gap: 22px;
}

.terms-panel,
.term-item {
  border-radius: 8px;
}

.terms-panel.highlighted {
  display: flex;
  min-height: 300px;
  flex-direction: column;
  justify-content: center;
  padding: 34px;
  color: var(--white);
  background: var(--green);
}

.terms-panel span {
  margin-bottom: 10px;
  font-weight: 900;
  text-transform: uppercase;
}

.terms-panel strong {
  margin-bottom: 14px;
  font-size: clamp(38px, 5vw, 56px);
  line-height: 1;
}

.terms-panel p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.88);
}

.terms-list {
  display: grid;
  gap: 14px;
}

.term-item {
  padding: 24px 26px;
  border: 1px solid var(--line);
}

.process-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.process-list li {
  min-height: 230px;
  padding: 24px;
  background: var(--white);
  border-top: 4px solid var(--amber);
}

.process-list span {
  display: inline-grid;
  width: 36px;
  height: 36px;
  margin-bottom: 20px;
  place-items: center;
  color: var(--white);
  font-weight: 900;
  background: var(--amber);
}

.process-list strong {
  display: block;
  margin-bottom: 8px;
  font-size: 19px;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(320px, 1.1fr);
  gap: 34px;
  align-items: center;
  padding: 88px clamp(18px, 5vw, 72px);
  color: var(--white);
  background: #1d2c32;
}

.contact-section .eyebrow {
  color: #a4f2cf;
}

.contact-section p:not(.eyebrow) {
  color: rgba(255, 255, 255, 0.80);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.contact-card {
  min-height: 130px;
  padding: 22px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
}

.contact-card:hover {
  border-color: rgba(164, 242, 207, 0.7);
  background: rgba(255, 255, 255, 0.12);
}

.contact-card span,
.contact-card strong {
  display: block;
}

.contact-card span {
  margin-bottom: 12px;
  color: #a4f2cf;
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.contact-card strong {
  overflow-wrap: anywhere;
  font-size: 20px;
  line-height: 1.25;
}

.site-footer {
  padding: 24px clamp(18px, 5vw, 72px);
  color: var(--muted);
  background: #11191d;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .main-nav {
    grid-column: 1 / -1;
    justify-content: flex-start;
    overflow-x: auto;
  }

  .hero {
    min-height: 680px;
  }

  .hero-stats,
  .product-grid,
  .process-list,
  .terms-layout,
  .contact-section {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .site-header {
    gap: 12px;
    padding: 12px 16px;
  }

  .brand small {
    display: none;
  }

  .language-switcher {
    justify-self: end;
  }

  .hero {
    min-height: 760px;
    padding: 72px 18px 52px;
  }

  .hero-media::after {
    background: linear-gradient(180deg, rgba(12, 22, 28, 0.86) 0%, rgba(12, 22, 28, 0.70) 58%, rgba(12, 22, 28, 0.48) 100%);
  }

  h1 {
    font-size: 38px;
  }

  .hero-lede,
  .section-heading p:not(.eyebrow),
  .contact-section p:not(.eyebrow) {
    font-size: 16px;
  }

  .hero-actions,
  .notice-band {
    align-items: stretch;
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .hero-stats,
  .product-grid,
  .process-list,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .section,
  .contact-section {
    padding: 64px 18px;
  }

  .feature-card,
  .process-list li {
    min-height: auto;
  }
}