:root {
  --navy: #1b4f8a;
  --navy-dark: #143a66;
  --navy-soft: #e8f1f8;
  --ink: #1f2937;
  --muted: #5b6b7c;
  --line: #d7e0ea;
  --bg: #f7f9fc;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(20, 58, 102, 0.08);
  --max: 1120px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}

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

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

img {
  max-width: 100%;
  height: auto;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 249, 252, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  font-weight: 700;
}

.brand img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.brand-text {
  font-size: 0.95rem;
  max-width: 14rem;
  line-height: 1.25;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: center;
}

.nav a {
  color: var(--muted);
  font-size: 0.95rem;
}

.nav a:hover,
.nav a.is-active {
  color: var(--navy);
}

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(27, 79, 138, 0.18), transparent 60%),
    linear-gradient(160deg, #f0f5fb 0%, #ffffff 48%, #eef4fa 100%);
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  padding: 4.5rem 0 4rem;
  display: grid;
  gap: 1.25rem;
  max-width: 46rem;
}

.eyebrow {
  display: inline-flex;
  width: fit-content;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--navy-soft);
  color: var(--navy);
  font-size: 0.85rem;
  font-weight: 600;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3.2vw, 2.7rem);
  line-height: 1.25;
  color: var(--navy-dark);
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.65rem 1.15rem;
  border-radius: 10px;
  font-weight: 600;
  border: 1px solid transparent;
}

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

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

.btn-ghost {
  background: #fff;
  border-color: var(--line);
  color: var(--navy);
}

.section {
  padding: 3.5rem 0;
}

.section h2 {
  margin: 0 0 0.5rem;
  font-size: 1.6rem;
  color: var(--navy-dark);
}

.section-lead {
  margin: 0 0 1.75rem;
  color: var(--muted);
  max-width: 40rem;
}

.grid-3,
.grid-2 {
  display: grid;
  gap: 1rem;
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
  color: var(--navy-dark);
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.card a.more {
  display: inline-block;
  margin-top: 0.9rem;
  font-weight: 600;
}

.layer-band {
  display: grid;
  gap: 0.75rem;
}

.layer {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 1.1rem 1.25rem;
  background: #fff;
}

.layer-app {
  background: #f3fbf6;
  border-color: #b7e0c8;
}

.layer-cap {
  background: var(--navy-soft);
  border-color: #b9d0e6;
}

.layer-base {
  background: #f3f5f8;
}

.layer strong {
  color: var(--navy-dark);
}

.page-hero {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.page-hero h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
  color: var(--navy-dark);
}

.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 42rem;
}

.prose {
  padding: 2rem 0 3rem;
}

.prose :is(h2, h3) {
  color: var(--navy-dark);
}

.prose p,
.prose li {
  color: var(--muted);
}

.content-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.6rem;
  box-shadow: var(--shadow);
}

.post-list {
  display: grid;
  gap: 1rem;
}

.post-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.post-item h2 {
  margin: 0 0 0.35rem;
  font-size: 1.2rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
  padding: 2rem 0 2.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 2fr 1fr;
}

.footer-title {
  color: var(--navy-dark);
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.footer-links {
  display: grid;
  gap: 0.35rem;
}

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

.entry-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

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

.demo-box {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  box-shadow: var(--shadow);
}

.demo-box h3 {
  margin: 0 0 0.75rem;
  color: var(--navy-dark);
}

.demo-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.demo-table th,
.demo-table td {
  text-align: left;
  padding: 0.55rem 0.35rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.demo-table th {
  width: 9rem;
  color: var(--navy-dark);
  font-weight: 600;
}

.demo-table td {
  color: var(--muted);
}

.qr-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
  text-align: center;
}

.qr-panel img {
  width: min(100%, 220px);
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--line);
}

.qr-loading {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.bullet-list {
  margin: 0.5rem 0 0;
  padding-left: 1.15rem;
  color: var(--muted);
}

.bullet-list li {
  margin: 0.35rem 0;
}

@media (max-width: 900px) {
  .grid-3,
  .grid-2,
  .footer-grid,
  .entry-grid {
    grid-template-columns: 1fr;
  }

  .brand-text {
    max-width: 9rem;
    font-size: 0.85rem;
  }

  .nav {
    justify-content: flex-end;
  }
}