:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --text: #151a2d;
  --muted: #5f6785;
  --primary: #4f46e5;
  --primary-dark: #3f38c8;
  --border: #e6e9f3;
  --shadow: 0 18px 38px rgba(41, 56, 111, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  background: rgba(246, 248, 252, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.2px;
}

nav a {
  margin-left: 18px;
  text-decoration: none;
  color: var(--muted);
  font-weight: 500;
}

.liang {
  padding: 96px 0 64px;
}

.liang-grid {
  display: grid;
  gap: 36px;
  grid-template-columns: 1fr 1.08fr;
  align-items: center;
}

.liang-content {
  max-width: 560px;
}

.badge {
  display: inline-block;
  margin: 0 0 10px;
  color: var(--primary);
  font-weight: 700;
  font-size: 0.84rem;
  background: #e9e9ff;
  border-radius: 999px;
  padding: 7px 13px;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 3.8vw, 4rem);
  line-height: 1.14;
}

.liang-text {
  color: var(--muted);
  max-width: 560px;
  margin-top: 15px;
  font-size: clamp(1rem, 1.3vw, 1.15rem);
}

.liang-actions {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  border-radius: 10px;
  font-weight: 600;
  text-decoration: none;
  padding: 11px 16px;
  transition: 0.2s;
}

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

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

.btn-secondary {
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--surface);
}

.liang-panel {
  width: 100%;
}

.liang-image {
  display: block;
  width: 100%;
  min-height: 420px;
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.section {
  padding: 24px 0 52px;
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
}

.about p,
.section-head p {
  margin: 0;
  color: var(--muted);
  max-width: 760px;
}

.about-grid {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.about-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.about-card p {
  margin: 0;
  color: var(--muted);
}

.section-head {
  margin-bottom: 20px;
}

.highlight-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.highlight-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 20px;
}

.highlight-card h3 {
  margin: 0 0 10px;
}

.highlight-card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.8;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.app-card {
  background: var(--surface);
  border-radius: 14px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 20px;
  display: grid;
  gap: 10px;
}

.app-card img {
  width: 64px;
  height: 64px;
  border-radius: 14px;
}

.app-card h3 {
  margin: 2px 0 0;
  font-size: 1.1rem;
}

.app-card p {
  margin: 0;
  color: var(--muted);
  min-height: 48px;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer-wrap {
  padding: 16px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.site-footer p {
  margin: 0;
  color: var(--muted);
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 14px;
}

@media (max-width: 900px) {
  .liang-grid,
  .about-grid,
  .highlight-grid,
  .app-grid {
    grid-template-columns: 1fr;
  }

  .liang {
    padding: 72px 0 38px;
  }

  .liang-image {
    min-height: 280px;
  }

  .nav-wrap {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  nav a {
    margin: 0 14px 0 0;
  }
}