* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Source Sans Pro", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #e5e7eb;
  background: radial-gradient(circle at 20% 20%, #162338, #0f172a 45%, #0b1220 80%);
  line-height: 1.6;
}

a {
  color: #7cc7ff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 24px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.logo-circle {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #1ea0ff, #5df3ff);
  color: #0b1220;
  display: grid;
  place-items: center;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.site-title {
  font-size: 22px;
  font-weight: 800;
}

.site-subtitle {
  color: #a5b4c7;
  font-size: 14px;
}

.nav {
  display: flex;
  gap: 18px;
  font-weight: 600;
}

.nav a {
  color: #e5e7eb;
  padding: 8px 12px;
  border-radius: 8px;
}

.nav a:hover {
  background: rgba(255, 255, 255, 0.06);
}

.hero {
  max-width: 1100px;
  margin: 16px auto 32px;
  padding: 36px 24px 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  align-items: center;
}

.hero-text h1 {
  font-size: 36px;
  margin: 8px 0 12px;
  line-height: 1.25;
}

.hero-sub {
  color: #b6c2d6;
  max-width: 520px;
}

.eyebrow {
  font-size: 14px;
  font-weight: 700;
  color: #7cc7ff;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.hero-actions {
  margin: 18px 0 10px;
  display: flex;
  gap: 12px;
}

.btn {
  padding: 12px 16px;
  border-radius: 10px;
  font-weight: 700;
  border: 1px solid transparent;
}

.btn.primary {
  background: linear-gradient(135deg, #1f8bff, #5df3ff);
  color: #0b1220;
  box-shadow: 0 12px 30px rgba(18, 95, 204, 0.35);
}

.btn.ghost {
  border-color: rgba(255, 255, 255, 0.2);
  color: #e5e7eb;
  background: rgba(255, 255, 255, 0.05);
}

.meta {
  display: flex;
  gap: 12px;
  color: #9aa6be;
  font-size: 13px;
}

.hero-media {
  position: relative;
}

.hero-media img {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.35);
}

.badge {
  position: absolute;
  bottom: 12px;
  left: 12px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: #e5e7eb;
  font-size: 13px;
  letter-spacing: 0.4px;
}

.section {
  max-width: 1100px;
  margin: 0 auto 32px;
  padding: 0 24px;
}

.section-head h2 {
  margin: 0 0 6px;
  font-size: 26px;
}

.section-head p {
  margin: 0;
  color: #9aa6be;
}

.card-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

.card {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
}

.card img {
  width: 100%;
  height: 190px;
  object-fit: cover;
}

.card-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tag {
  display: inline-block;
  background: rgba(124, 199, 255, 0.15);
  color: #7cc7ff;
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.2px;
}

.card h3 {
  margin: 0;
  font-size: 18px;
  color: #eef2ff;
}

.excerpt {
  margin: 0;
  color: #9aa6be;
}

.read-more {
  font-weight: 700;
  margin-top: auto;
  color: #7cc7ff;
}

.article-body {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 18px 18px 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.article-body p {
  color: #d9e0ee;
}

.meta-line {
  color: #9aa6be;
  font-size: 13px;
}

.lab .notes {
  list-style: none;
  padding: 0;
  margin: 10px 0 0;
  display: grid;
  gap: 10px;
}

.lab li {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 12px;
}

.about-body {
  margin-top: 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 12px;
}

.footer {
  max-width: 1100px;
  margin: 24px auto 32px;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  color: #9aa6be;
  font-size: 14px;
}

.footer-right a {
  color: #9aa6be;
  font-weight: 700;
}

.article-page {
  background: #0b1220;
}

.article-container {
  max-width: 900px;
  margin: 0 auto 40px;
  padding: 0 20px;
}

.article-hero {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
  margin-bottom: 18px;
}

.article-hero img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  display: block;
}

.article-hero-text {
  padding: 16px 18px 14px;
}

.article-hero-text h1 {
  margin: 8px 0 4px;
  font-size: 26px;
}

.code-block {
  display: block;
  background: #0b0f1a;
  color: #e2e8f0;
  padding: 12px;
  border-radius: 10px;
  overflow-x: auto;
  font-size: 13px;
}

@media (max-width: 680px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .hero-text h1 {
    font-size: 26px;
  }

  .hero-actions {
    flex-wrap: wrap;
  }

  .card img {
    height: 160px;
  }
}