:root {
  --color-bg: #f6f8fb;
  --color-surface: #ffffff;
  --color-text: #1a2332;
  --color-muted: #5c6b7a;
  --color-primary: #0d6e8a;
  --color-primary-dark: #09566d;
  --color-accent: #e8f4f8;
  --color-border: #dde4ec;
  --shadow-sm: 0 1px 3px rgba(26, 35, 50, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 35, 50, 0.08);
  --radius: 12px;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1100px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  color: var(--color-primary-dark);
}

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text);
  font-weight: 600;
}

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

.logo-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), #14a3c7);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
}

.logo-text {
  font-size: 0.95rem;
  line-height: 1.3;
}

.nav {
  display: flex;
  gap: 0.25rem;
}

.nav a {
  padding: 0.5rem 1rem;
  border-radius: 8px;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.nav a:hover,
.nav a.active {
  color: var(--color-primary);
  background: var(--color-accent);
}

/* Hero */
.hero {
  background: linear-gradient(160deg, #0a4d61 0%, #0d6e8a 45%, #1496b5 100%);
  color: #fff;
  padding: 4.5rem 0 5rem;
}

.hero-inner {
  max-width: 720px;
}

.hero-tag {
  display: inline-block;
  margin: 0 0 1rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.15);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.25;
  font-weight: 700;
}

.hero-desc {
  margin: 0 0 2rem;
  font-size: 1.05rem;
  opacity: 0.92;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn-outline {
  border: 1px solid rgba(255, 255, 255, 0.6);
  color: #fff;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section-alt {
  background: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

.section-title {
  margin: 0 0 0.5rem;
  font-size: 1.6rem;
}

.section-lead {
  margin: 0 0 2rem;
  color: var(--color-muted);
  max-width: 640px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.card {
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  color: var(--color-primary-dark);
}

.card p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.split {
  display: grid;
  grid-template-columns: 1fr minmax(260px, 320px);
  gap: 2.5rem;
  align-items: start;
}

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

.text-link {
  display: inline-block;
  margin-top: 0.5rem;
  font-weight: 500;
}

.info-panel {
  padding: 1.5rem;
  background: var(--color-accent);
  border-radius: var(--radius);
  border: 1px solid #c5e3ed;
}

.info-panel h3 {
  margin: 0 0 1rem;
  font-size: 1rem;
}

.info-panel dl {
  margin: 0;
}

.info-panel dt {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-top: 0.75rem;
}

.info-panel dt:first-child {
  margin-top: 0;
}

.info-panel dd {
  margin: 0.15rem 0 0;
  font-weight: 500;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.contact-card {
  padding: 1.25rem 1.5rem;
  background: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.contact-label {
  display: block;
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-bottom: 0.35rem;
}

.contact-card p {
  margin: 0;
  font-weight: 500;
}

.contact-note {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--color-muted);
}

/* Page hero */
.page-hero {
  padding: 3rem 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
  margin: 0 0 0.35rem;
  font-size: 2rem;
}

.page-hero p {
  margin: 0;
  color: var(--color-muted);
}

.content-block h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.25rem;
  color: var(--color-primary-dark);
}

.content-block h2:first-child {
  margin-top: 0;
}

.content-block p {
  color: var(--color-muted);
}

.bullet-list,
.numbered-list {
  color: var(--color-muted);
  padding-left: 1.25rem;
}

.bullet-list li,
.numbered-list li {
  margin-bottom: 0.5rem;
}

.muted {
  color: var(--color-muted);
  font-size: 0.9rem;
}

.small {
  font-size: 0.85rem;
}

/* Contact page */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr minmax(240px, 320px);
  gap: 2rem;
  align-items: start;
}

.contact-dl {
  margin: 0;
}

.contact-dl dt {
  margin-top: 1.25rem;
  font-size: 0.8rem;
  color: var(--color-muted);
}

.contact-dl dt:first-of-type {
  margin-top: 0;
}

.contact-dl dd {
  margin: 0.2rem 0 0;
  font-size: 1.05rem;
  font-weight: 500;
}

.contact-map-placeholder {
  padding: 2rem 1.5rem;
  background: linear-gradient(145deg, var(--color-accent), #fff);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-align: center;
}

.contact-map-placeholder h3 {
  margin: 0 0 0.5rem;
}

.contact-map-placeholder p {
  margin: 0.25rem 0;
}

/* Footer */
.site-footer {
  padding: 2rem 0;
  background: #15202b;
  color: #a8b5c4;
  font-size: 0.9rem;
}

.footer-inner {
  text-align: center;
}

.footer-inner p {
  margin: 0.35rem 0;
}

.site-footer a {
  color: #8ecae6;
}

.site-footer a:hover {
  color: #fff;
}

/* Responsive */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.75rem 0;
    min-height: auto;
  }

  .nav {
    width: 100%;
    justify-content: flex-start;
  }

  .split,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 3rem 0;
  }
}