:root {
  --primary: #0052a3;
  --primary-light: #e6f0fb;
  --accent: #f9a826;
  --text-main: #222;
  --text-muted: #666;
  --bg: #ffffff;
  --bg-alt: #f5f7fb;
  --border-soft: #dde3f0;
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.06);
  --radius-card: 12px;
  --radius-pill: 999px;
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-main);
  color: var(--text-main);
  background-color: var(--bg);
  line-height: 1.6;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}

/* 图文并茂：图片与说明 */
.figure-block {
  margin: 0;
  padding: 0;
}
.figure-block img {
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
  width: 100%;
}
figcaption,
.img-caption {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 10px;
  line-height: 1.5;
  padding: 0 4px;
}
.figure-block figcaption {
  margin-top: 12px;
  font-style: normal;
}

.container {
  width: min(1200px, 100% - 32px);
  margin-inline: auto;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(221, 227, 240, 0.7);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 12px 0;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.logo-text h1 {
  font-size: 18px;
  margin: 0;
}

.logo-text p {
  font-size: 13px;
  margin: 2px 0 0;
  color: var(--text-muted);
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
}

.main-nav a {
  text-decoration: none;
  color: var(--text-muted);
  padding: 6px 10px;
  border-radius: 999px;
  transition: background-color 0.2s, color 0.2s;
}

.main-nav a:hover {
  background-color: var(--primary-light);
  color: var(--primary);
}

/* Hero */

.hero {
  background: radial-gradient(circle at top left, #e6f0fb, #ffffff);
  padding: 48px 0 40px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2.5fr);
  gap: 32px;
  align-items: center;
}

.hero-text h2 {
  font-size: clamp(26px, 3vw, 32px);
  margin-bottom: 12px;
}

.hero-text p {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.hero-highlights {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.hero-highlights li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
}

.hero-highlights li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.hero-image {
  position: relative;
}
.hero-image img,
.hero-img {
  border-radius: 16px;
  box-shadow: 0 20px 50px rgba(0, 82, 163, 0.12), 0 8px 24px rgba(0, 0, 0, 0.06);
  width: 100%;
  aspect-ratio: 560/360;
  object-fit: cover;
}

/* Sections */

.section {
  padding: 40px 0;
}

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

.section h3 {
  font-size: 22px;
  margin-top: 0;
  margin-bottom: 16px;
  position: relative;
}

.section h3::after {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  margin-top: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2.5fr);
  gap: 28px;
  align-items: flex-start;
}

.image-col .figure-block,
.image-col img {
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
}
.image-col .figure-block {
  overflow: hidden;
}

/* Feature grid */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.feature-card {
  background-color: #ffffff;
  border-radius: var(--radius-card);
  padding: 20px 20px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(221, 227, 240, 0.7);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  text-align: left;
}

.feature-card::before {
  content: "";
  width: 44px;
  height: 44px;
  min-width: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary-light), #d4e8f8) no-repeat center, url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230052a3' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M13 2L3 14h9l-1 8 10-12h-9l1-8z'/%3E%3C/svg%3E") no-repeat center;
  background-size: cover, 24px;
  opacity: 0.95;
}

.feature-card:nth-child(2)::before { background: linear-gradient(135deg, var(--primary-light), #d4e8f8) no-repeat center, url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230052a3' stroke-width='2'%3E%3Cpath d='M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z'/%3E%3C/svg%3E") no-repeat center; background-size: cover, 24px; }
.feature-card:nth-child(3)::before { background: linear-gradient(135deg, var(--primary-light), #d4e8f8) no-repeat center, url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230052a3' stroke-width='2'%3E%3Crect x='3' y='3' width='7' height='7' rx='1'/%3E%3Crect x='14' y='3' width='7' height='7' rx='1'/%3E%3Crect x='14' y='14' width='7' height='7' rx='1'/%3E%3Crect x='3' y='14' width='7' height='7' rx='1'/%3E%3C/svg%3E") no-repeat center; background-size: cover, 24px; }
.feature-card:nth-child(4)::before { background: linear-gradient(135deg, var(--primary-light), #d4e8f8) no-repeat center, url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230052a3' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='10'/%3E%3Cpath d='M12 6v6l4 2'/%3E%3C/svg%3E") no-repeat center; background-size: cover, 24px; }

.feature-card h4 {
  margin: 0 0 6px;
  font-size: 16px;
  grid-column: 2;
}

.feature-card p {
  margin: 0;
  font-size: 14px;
  color: var(--text-muted);
  grid-column: 2;
  line-height: 1.55;
}

/* Tables */

.table-wrapper {
  overflow-x: auto;
  border-radius: 10px;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--border-soft);
  background-color: #ffffff;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
  font-size: 13px;
}

thead {
  background: linear-gradient(90deg, #f3f6fc, #e6f0fb);
}

th,
td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-soft);
  text-align: left;
}

th {
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
}

tbody tr:nth-child(even) {
  background-color: #fafbff;
}

/* Specs */

.spec-group {
  margin-bottom: 24px;
}

.spec-group h4 {
  margin-bottom: 10px;
  font-size: 16px;
}

.centered-image {
  margin-top: 28px;
  margin-bottom: 12px;
  text-align: center;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}
.spec-image {
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--border-soft);
  width: 100%;
}
.centered-image .img-caption {
  margin-top: 12px;
}

/* Applications */

.application-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.app-card {
  background-color: #ffffff;
  border-radius: var(--radius-card);
  padding: 0 0 20px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(221, 227, 240, 0.7);
  overflow: hidden;
  transition: box-shadow 0.25s, transform 0.25s;
}
.app-card:hover {
  box-shadow: 0 16px 40px rgba(0, 82, 163, 0.1);
  transform: translateY(-2px);
}

.app-card img {
  border-radius: 0;
  margin-bottom: 0;
  width: 100%;
  aspect-ratio: 320/200;
  object-fit: cover;
  border-bottom: 3px solid var(--primary-light);
}

.app-card .app-card-body {
  padding: 16px 18px 0;
}
.app-card h4 {
  margin: 0 0 8px;
  font-size: 15px;
}

.app-card p {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Contact */

.contact-section .contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14px;
}

.contact-section .contact-list li + li {
  margin-top: 4px;
}

.contact-section .image-col img {
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
  width: 100%;
}
.contact-section .img-caption {
  margin-top: 10px;
}

/* Footer */

.site-footer {
  padding: 16px 0 20px;
  border-top: 1px solid rgba(221, 227, 240, 0.8);
  background-color: #ffffff;
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}

/* Responsive */

@media (max-width: 900px) {
  .hero-inner,
  .two-column {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding-top: 32px;
  }

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .main-nav {
    width: 100%;
    overflow-x: auto;
  }
}

@media (max-width: 600px) {
  .site-header {
    position: static;
  }

  .hero {
    padding: 24px 0 28px;
  }

  .section {
    padding: 28px 0;
  }
}