:root {
  --color-primary: #1e40af;
  --color-primary-strong: #162f8a;
  --color-accent: #059669;
  --color-accent-2: #0ea5e9;
  --color-muted: #6b7280;
  --color-text: #0f172a;
  --color-surface: #ffffff;
  --color-surface-alt: #f4f6fb;
  --color-line: #e5e7eb;
  --shadow-sm: 0 4px 16px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 12px 30px rgba(15, 23, 42, 0.12);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --font-main: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --container: 1200px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-14: 56px;
  --space-18: 72px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: #f8fafc;
  line-height: 1.65;
  padding-top: 112px;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

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

h1,
h2,
h3,
h4,
h5 {
  color: #0b132b;
  line-height: 1.3;
  font-weight: 700;
}

p {
  color: var(--color-muted);
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section {
  padding: var(--space-14) 0;
}

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

.section__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.section__title {
  font-size: 28px;
  letter-spacing: 0.5px;
}

.section__lead {
  max-width: 720px;
  color: var(--color-muted);
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  width: 100%;
  z-index: 30;
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.topbar {
  position: fixed;
  right: 24px;
  bottom: 24px;
  background: #0f1d47;
  color: rgba(255, 255, 255, 0.9);
  font-size: 14px;
  padding: var(--space-5);
  border-radius: 16px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
  width: min(380px, calc(100% - 32px));
  z-index: 60;
}

.topbar .container {
  padding: 0;
  margin: 0;
  max-width: none;
}

.topbar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.topbar__title {
  font-weight: 700;
  color: #fff;
  font-size: 15px;
}

.topbar__toggle {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.topbar__toggle:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.3);
}

.topbar__content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
}

.topbar__info {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.topbar__links {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

.topbar__links a {
  color: rgba(255, 255, 255, 0.9);
}

.topbar.is-collapsed {
  padding: var(--space-4);
  width: auto;
}

.topbar.is-collapsed .topbar__header {
  margin-bottom: 0;
}

.topbar.is-collapsed .topbar__content {
  display: none;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 88px;
}

.site-header > .container {
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.logo {
  font-weight: 800;
  font-size: 22px;
  letter-spacing: 0.6px;
  color: var(--color-primary);
}

.nav-menu {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: nowrap;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-block;
  padding: var(--space-3) var(--space-3);
  color: #111827;
  font-weight: 600;
  font-size: 15px;
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-item .dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 210px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-3) 0;
}

.nav-item:hover > .dropdown-menu {
  display: block;
}

.dropdown-item a {
  display: block;
  padding: var(--space-3) var(--space-5);
  color: #111827;
  font-weight: 500;
}

.dropdown-item a:hover {
  background: var(--color-surface-alt);
  color: var(--color-primary);
}

.menu-toggle {
  display: none;
  font-size: 28px;
  cursor: pointer;
}

.nav-cta .btn {
  margin-left: var(--space-2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--color-primary-strong);
  transform: translateY(-1px);
}

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

.btn-ghost {
  border: 1px solid var(--color-line);
  color: #111827;
  background: #f9fafb;
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: #eef2ff;
}

.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(120deg, #0f1d47, #0b246c);
  color: #fff;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr;
  gap: var(--space-10);
  align-items: center;
  padding: var(--space-18) 0 var(--space-14);
}

.hero__title {
  font-size: 42px;
  margin-bottom: var(--space-4);
}

.hero__subtitle {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: var(--space-6);
}

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.pill {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: #e5edff;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: var(--space-4);
}

.stat {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.06);
}

.stat__number {
  font-size: 26px;
  font-weight: 800;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.card--ghost {
  background: #fff;
  border-style: dashed;
}

.card__title {
  font-size: 18px;
  margin-bottom: var(--space-3);
}

.card__meta {
  color: var(--color-muted);
  font-size: 14px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-5);
}

.service-grid .service-card {
  position: relative;
  height: 100%;
  border-radius: var(--radius-md);
  padding: var(--space-6);
  background: #fff;
  border: 1px solid var(--color-line);
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.service-card h3 {
  margin-bottom: var(--space-3);
}

.service-card ul {
  list-style: none;
  margin-top: var(--space-3);
  display: grid;
  gap: 6px;
  color: var(--color-muted);
}

.tag {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  background: #eef2ff;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 13px;
}

.tag--accent {
  background: #ecfdf3;
  color: #0f5132;
}

.platform-panel {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-8);
  align-items: center;
}

.platform-panel__meta {
  display: grid;
  gap: var(--space-4);
}

.list {
  list-style: none;
  display: grid;
  gap: var(--space-3);
  color: var(--color-muted);
}

.list li {
  position: relative;
  padding-left: 18px;
}

.list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
}

.stats .card {
  text-align: center;
  padding: var(--space-5);
}

.stats .card h3 {
  font-size: 30px;
  margin-bottom: var(--space-2);
}

.timeline {
  list-style: none;
  padding-left: 0;
  display: grid;
  gap: var(--space-5);
}

.timeline__item {
  position: relative;
  padding-left: 26px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 6px #e8ecff;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

.case-card {
  padding: var(--space-6);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-line);
  background: #fff;
  display: grid;
  gap: var(--space-3);
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}

.case-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.case-metrics {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.metric {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  padding: 6px 10px;
  background: #f1f5f9;
  border-radius: var(--radius-sm);
  color: #0f172a;
  font-weight: 600;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

.news-card {
  border: 1px solid var(--color-line);
  background: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}

.news-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.news-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.news-card__body {
  padding: var(--space-5);
  display: grid;
  gap: var(--space-3);
}

.news-meta {
  color: var(--color-muted);
  font-size: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.banner {
  padding: var(--space-10);
  background: #0f172a;
  color: #e5edff;
  border-radius: var(--radius-lg);
  display: grid;
  gap: var(--space-4);
  box-shadow: var(--shadow-md);
}

.footer {
  background: #0b1a3a;
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-10) 0 var(--space-6);
}

.footer h4 {
  color: #fff;
  margin-bottom: var(--space-4);
}

.footer a {
  color: rgba(255, 255, 255, 0.9);
}

.footer a:hover {
  color: #93c5fd;
}

.footer ul {
  list-style: none;
  display: grid;
  gap: 10px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  text-align: center;
  font-size: 14px;
}

.chips {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.chip {
  border: 1px solid var(--color-line);
  border-radius: 999px;
  padding: 6px 12px;
  background: #fff;
  color: var(--color-muted);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

label {
  font-weight: 600;
  color: #111827;
  margin-bottom: 6px;
  display: inline-block;
}

input,
textarea,
select {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-line);
  background: #fff;
  color: #0f172a;
  font-family: var(--font-main);
}

textarea {
  min-height: 140px;
}

.table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-5);
}

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

.table th {
  background: var(--color-surface-alt);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: #eef2ff;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.4px;
}

.badge--accent {
  background: #ecfdf3;
  color: #0f5132;
}

.layout-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: center;
}

.quote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--space-4);
  color: #0f172a;
  font-weight: 600;
}

.map-placeholder {
  height: 280px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #e8ecff, #d9f3ff);
  display: grid;
  place-items: center;
  color: #0f172a;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.tabs {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.tab {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-line);
  background: #fff;
  cursor: pointer;
  font-weight: 600;
  color: #111827;
}

.tab.is-active {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: #eef2ff;
}

.list-inline {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  list-style: none;
}

.list-inline li {
  color: var(--color-muted);
}

.article {
  display: grid;
  gap: var(--space-5);
}

.article h2 {
  font-size: 22px;
}

.article p {
  color: #1f2937;
}

.contact-card {
  padding: var(--space-6);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

@media (max-width: 1024px) {
  body {
    padding-top: 104px;
  }
  .hero__inner,
  .platform-panel,
  .layout-split,
  .grid-3,
  .grid-4,
  .news-grid,
  .stats,
  .hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 104px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    padding: var(--space-4);
    border-top: 1px solid var(--color-line);
    z-index: 70;
  }
  .nav-menu.active {
    display: flex;
  }
  .nav-item .dropdown-menu {
    position: static;
    border: none;
    box-shadow: none;
    padding-left: var(--space-4);
  }
  .nav-item:hover > .dropdown-menu {
    display: none;
  }
  .nav-item .dropdown-menu.active {
    display: block;
  }
  .menu-toggle {
    display: block;
  }
  .nav-link {
    padding: var(--space-3) 0;
  }
}

@media (max-width: 768px) {
  body {
    padding-top: 96px;
  }
  .hero__inner,
  .platform-panel,
  .layout-split,
  .grid-3,
  .grid-4,
  .grid-2,
  .news-grid,
  .stats,
  .hero__stats {
    grid-template-columns: 1fr;
  }
  .card-grid {
    grid-template-columns: 1fr;
  }
  .section__header {
    flex-direction: column;
    align-items: flex-start;
  }
  .navbar {
    height: 80px;
  }
  .hero__title {
    font-size: 32px;
  }
  .hero {
    border-radius: 0;
  }
}

@media (max-width: 640px) {
  .topbar {
    right: 16px;
    left: 16px;
    bottom: 16px;
    width: auto;
  }
  .topbar__toggle {
    width: 100%;
  }
  .topbar.is-collapsed {
    width: auto;
  }
}