:root {
  --blue: #006fae;
  --deep: #003b5c;
  --green: #2fae8b;
  --ink: #102635;
  --muted: #617383;
  --line: #dbe7ed;
  --soft: #f6f9fb;
  --white: #ffffff;
  --shadow: 0 18px 50px rgba(0, 59, 92, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(219, 231, 237, 0.8);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  min-width: 210px;
}

.brand-logo {
  display: block;
  width: 196px;
  height: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #274456;
  font-size: 14px;
  font-weight: 650;
}

.site-nav a {
  padding: 9px 12px;
  border-radius: 8px;
}

.site-nav a:hover {
  color: var(--blue);
  background: #edf7fb;
}

.site-nav .nav-action {
  color: var(--white);
  background: var(--deep);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.nav-toggle span {
  width: 19px;
  height: 2px;
  background: var(--deep);
}

.hero {
  position: relative;
  min-height: 660px;
  display: grid;
  align-items: center;
  overflow: hidden;
}

.hero-image,
.hero-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-image {
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.86) 42%, rgba(255, 255, 255, 0.18) 78%),
    linear-gradient(180deg, rgba(0, 59, 92, 0.03), rgba(0, 111, 174, 0.12));
}

.hero-content {
  position: relative;
  width: min(760px, calc(100% - 36px));
  margin-left: clamp(18px, 6vw, 86px);
  padding: 80px 0 58px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  max-width: 720px;
  margin-bottom: 22px;
  color: var(--deep);
  font-size: clamp(38px, 5.5vw, 68px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  color: var(--deep);
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  color: var(--deep);
  font-size: 20px;
  line-height: 1.3;
}

.hero-copy {
  max-width: 660px;
  color: #31576c;
  font-size: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
}

.button.primary {
  color: var(--white);
  background: var(--blue);
  box-shadow: 0 12px 24px rgba(0, 111, 174, 0.22);
}

.button.secondary {
  color: var(--deep);
  background: rgba(255, 255, 255, 0.82);
  border-color: var(--line);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 42px;
}

.hero-stats span {
  min-width: 150px;
  padding: 12px 16px;
  color: #305165;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(219, 231, 237, 0.9);
  border-radius: 8px;
}

.hero-stats strong {
  display: block;
  color: var(--deep);
  font-size: 26px;
  line-height: 1.1;
}

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

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading.split {
  display: flex;
  max-width: none;
  justify-content: space-between;
  gap: 36px;
}

.section-heading.split > p {
  max-width: 520px;
  color: var(--muted);
  font-size: 18px;
}

.band {
  background: var(--soft);
}

.intro-grid,
.category-grid,
.application-grid,
.resource-grid {
  display: grid;
  gap: 18px;
}

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

.intro-grid article,
.category-card,
.application-grid article,
.advantage-list article {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 59, 92, 0.06);
}

.intro-grid article {
  position: relative;
  overflow: hidden;
  padding: 26px;
}

.intro-grid article::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.intro-grid article::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
}

.intro-grid article > * {
  position: relative;
  z-index: 1;
}

.intro-grid article:nth-child(1)::before {
  background: linear-gradient(145deg, rgba(0, 111, 174, 0.11), rgba(255, 255, 255, 0.72) 62%);
}

.intro-grid article:nth-child(1)::after {
  background: var(--blue);
}

.intro-grid article:nth-child(2)::before {
  background: linear-gradient(145deg, rgba(0, 142, 164, 0.12), rgba(255, 255, 255, 0.74) 62%);
}

.intro-grid article:nth-child(2)::after {
  background: #008ea4;
}

.intro-grid article:nth-child(3)::before {
  background: linear-gradient(145deg, rgba(47, 174, 139, 0.13), rgba(255, 255, 255, 0.74) 62%);
}

.intro-grid article:nth-child(3)::after {
  background: var(--green);
}

.icon {
  display: grid;
  width: 44px;
  height: 44px;
  margin-bottom: 18px;
  place-items: center;
  color: var(--blue);
  background: #e9f6fb;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 900;
}

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

.category-card {
  position: relative;
  overflow: hidden;
  min-height: 288px;
  padding: 24px;
}

.category-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.category-card > * {
  position: relative;
  z-index: 1;
}

.category-card:nth-child(1)::before {
  background: linear-gradient(150deg, rgba(0, 111, 174, 0.09), rgba(255, 255, 255, 0.78) 60%);
}

.category-card:nth-child(2)::before {
  background: linear-gradient(150deg, rgba(47, 174, 139, 0.1), rgba(255, 255, 255, 0.8) 60%);
}

.category-card:nth-child(3)::before {
  background: linear-gradient(150deg, rgba(0, 111, 174, 0.12), rgba(47, 174, 139, 0.08) 46%, rgba(255, 255, 255, 0.78) 72%);
}

.category-card:nth-child(4)::before {
  background: linear-gradient(150deg, rgba(0, 142, 164, 0.09), rgba(255, 255, 255, 0.8) 60%);
}

.category-card.featured {
  border-color: rgba(0, 111, 174, 0.28);
  box-shadow: 0 14px 36px rgba(0, 111, 174, 0.11);
}

.category-card.featured::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--green));
}

.card-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.card-top span {
  height: 26px;
  padding: 3px 8px;
  color: var(--green);
  background: #edf9f5;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.featured .card-top span {
  color: var(--blue);
  background: #e8f5fb;
}

.category-card p,
.intro-grid p,
.application-grid p,
.advantage-list p {
  color: var(--muted);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.tag-list li {
  padding: 6px 9px;
  color: #31576c;
  background: #edf7fb;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
}

.featured .tag-list li {
  color: #31576c;
  background: #e3f2f8;
}

.table-wrap {
  margin-top: 28px;
  overflow: auto;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 59, 92, 0.06);
}

table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
}

caption {
  padding: 20px 22px;
  color: var(--deep);
  font-size: 20px;
  font-weight: 850;
  text-align: left;
}

th,
td {
  padding: 16px 22px;
  border-top: 1px solid var(--line);
  text-align: left;
}

th {
  color: var(--deep);
  background: #edf7fb;
  font-size: 14px;
}

td {
  color: #31576c;
}

.application-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.application-grid article {
  min-height: 246px;
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.application-grid span {
  margin-top: auto;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}

.two-column > div:first-child p:not(.eyebrow) {
  color: var(--muted);
  font-size: 18px;
}

.text-link {
  display: inline-flex;
  margin-top: 16px;
  color: var(--blue);
  font-weight: 850;
}

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

.advantage-list article {
  padding: 22px;
}

.resources {
  background: var(--white);
}

.resource-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.resource-grid a {
  min-height: 108px;
  display: flex;
  align-items: center;
  padding: 20px;
  color: var(--deep);
  background: #f0f8fb;
  border: 1px solid #d5eaf1;
  border-radius: 8px;
  font-weight: 850;
}

.resource-grid a:hover {
  color: var(--white);
  background: var(--blue);
  border-color: var(--blue);
}

.inquiry {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(320px, 520px);
  gap: clamp(28px, 5vw, 72px);
  padding: 86px clamp(18px, 5vw, 72px);
  color: var(--white);
  background: linear-gradient(135deg, var(--deep), #006b85 58%, #159979);
}

.inquiry h2,
.inquiry p {
  color: var(--white);
}

.inquiry-content {
  max-width: 640px;
}

.contact-card {
  margin-top: 30px;
  padding: 22px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 8px;
}

.contact-card h3 {
  margin-bottom: 18px;
  color: var(--white);
}

.contact-card dl {
  display: grid;
  gap: 12px;
  margin: 0;
}

.contact-card div {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
}

.contact-card dt {
  color: rgba(255, 255, 255, 0.72);
  font-weight: 800;
}

.contact-card dd {
  margin: 0;
  color: var(--white);
  font-weight: 800;
}

.contact-card a {
  color: var(--white);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.inquiry-form {
  display: grid;
  gap: 14px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 8px;
  box-shadow: 0 26px 60px rgba(0, 35, 52, 0.25);
}

label {
  display: grid;
  gap: 7px;
  color: var(--deep);
  font-size: 14px;
  font-weight: 800;
}

input,
select,
textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  color: var(--ink);
  border: 1px solid #cfdde5;
  border-radius: 8px;
  font: inherit;
}

textarea {
  resize: vertical;
}

.form-status {
  min-height: 22px;
  margin: 0;
  color: #31576c;
  font-size: 14px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 24px clamp(18px, 5vw, 72px);
  color: #d9edf5;
  background: #082d42;
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: #ffffff;
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 1180px) {
  .category-grid,
  .application-grid,
  .resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .site-header {
    align-items: flex-start;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 18px;
    right: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
  }

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

  .hero {
    min-height: 720px;
  }

  .hero-overlay {
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.9) 55%, rgba(255, 255, 255, 0.28) 100%),
      linear-gradient(180deg, rgba(0, 59, 92, 0.02), rgba(0, 111, 174, 0.16));
  }

  .hero-content {
    margin: 0 auto;
  }

  .intro-grid,
  .category-grid,
  .application-grid,
  .resource-grid,
  .two-column,
  .inquiry {
    grid-template-columns: 1fr;
  }

  .section-heading.split,
  .site-footer {
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .brand {
    min-width: 0;
    max-width: calc(100vw - 96px);
  }

  .brand-logo {
    width: 164px;
  }

  h1 {
    font-size: 38px;
  }

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

  .hero-actions .button {
    width: 100%;
  }

  .section,
  .inquiry {
    padding-top: 64px;
    padding-bottom: 64px;
  }
}