:root {
  --indigo: #4a55c9;
  --indigo-dark: #3d47b8;
  --mint: #8cf0c9;
  --text: #1e2030;
  --text-soft: #5a5e75;
  --bg: #f7f8fc;
  --card: #ffffff;
  --border: #e4e6f0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e8eaf6;
    --text-soft: #a9aec5;
    --bg: #12131c;
    --card: #1c1e2c;
    --border: #2c2f42;
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

header {
  background: linear-gradient(135deg, #5a63d8, var(--indigo-dark));
  color: #fff;
  padding: 40px 24px 32px;
}

.header-inner {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.14);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
  color: var(--mint);
  flex-shrink: 0;
}

.header-inner h1 {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.header-inner p {
  font-size: 14px;
  opacity: 0.85;
}

main {
  max-width: 760px;
  margin: -16px auto 48px;
  padding: 0 24px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 32px 40px;
  box-shadow: 0 4px 20px rgba(30, 32, 60, 0.06);
}

.updated {
  font-size: 13px;
  color: var(--text-soft);
  margin-bottom: 24px;
}

h2 {
  font-size: 19px;
  font-weight: 700;
  margin: 28px 0 8px;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 16px;
  font-weight: 650;
  margin: 20px 0 6px;
}

p,
li {
  font-size: 15px;
  color: var(--text);
  margin-bottom: 10px;
}

ul {
  padding-left: 22px;
  margin-bottom: 12px;
}

a {
  color: var(--indigo);
  font-weight: 550;
}

@media (prefers-color-scheme: dark) {
  a {
    color: #a9aeea;
  }
}

.footer {
  max-width: 760px;
  margin: 0 auto 40px;
  padding: 0 24px;
  font-size: 13px;
  color: var(--text-soft);
  text-align: center;
}

.footer a {
  color: var(--text-soft);
}

.contact {
  margin-top: 28px;
  padding: 16px 20px;
  border-radius: 12px;
  background: rgba(74, 85, 201, 0.08);
  font-size: 15px;
}