:root {
  --bg: #eef4ff;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: #ffffff;
  --text: #14213d;
  --muted: #51607d;
  --line: rgba(20, 33, 61, 0.12);
  --accent: #0066ff;
  --accent-soft: rgba(0, 102, 255, 0.12);
  --accent-warm: #00b7a8;
  --shadow: 0 24px 50px rgba(23, 44, 90, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(0, 102, 255, 0.16), transparent 32%),
    radial-gradient(circle at top right, rgba(0, 183, 168, 0.14), transparent 24%),
    linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
}

.page-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 40px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.64);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.brand-block {
  display: grid;
  gap: 4px;
}

.brand-name {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-tag,
.miit-link,
.eyebrow,
.section-kicker,
.panel-label {
  color: var(--muted);
}

.miit-link {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  text-decoration: none;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  padding: 32px 0 26px;
}

.hero-copy,
.hero-panel,
.content-card,
.site-footer {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--surface);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 38px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 10px;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p,
ul {
  margin-top: 0;
}

h1 {
  margin-bottom: 16px;
  font-size: clamp(2.4rem, 5vw, 4.4rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(1.5rem, 2.6vw, 2rem);
}

h3 {
  margin-bottom: 12px;
  font-size: 1.3rem;
}

.hero-text {
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.08rem;
}

.hero-note {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.hero-note span {
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--text);
}

.hero-panel {
  display: grid;
  gap: 14px;
  padding: 24px;
}

.panel-card {
  padding: 18px;
  border-radius: 22px;
  background:
    linear-gradient(135deg, rgba(0, 102, 255, 0.08), rgba(0, 183, 168, 0.08)),
    var(--surface-strong);
  border: 1px solid rgba(0, 102, 255, 0.08);
}

.panel-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.08rem;
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.wide-card {
  grid-column: span 2;
}

.content-card {
  padding: 28px;
}

.plain-list {
  margin-bottom: 0;
  padding-left: 18px;
  color: var(--muted);
}

.plain-list li + li {
  margin-top: 10px;
}

.experiment-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.experiment-card {
  min-height: 220px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(232, 242, 255, 0.82)),
    var(--surface);
}

.site-footer {
  margin-top: 24px;
  padding: 22px 26px;
  text-align: center;
}

.site-footer p:last-child {
  margin-bottom: 0;
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

@media (max-width: 900px) {
  .hero,
  .section-grid,
  .experiment-grid {
    grid-template-columns: 1fr;
  }

  .wide-card {
    grid-column: span 1;
  }
}

@media (max-width: 680px) {
  .page-shell {
    width: min(100% - 20px, 1120px);
    padding-top: 14px;
  }

  .topbar,
  .hero-copy,
  .hero-panel,
  .content-card,
  .site-footer {
    border-radius: 20px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-copy,
  .hero-panel,
  .content-card {
    padding: 22px;
  }

  h1 {
    font-size: 2.3rem;
  }
}