:root {
  --navy: #152a5e;
  --blue: #3b82c4;
  --blue-light: #eaf3fb;
  --bg-top: #eef3f9;
  --bg-bottom: #dde8f4;
  --card: #ffffff;
  --border: #e1e8f2;
  --text: #1a2440;
  --text-dim: #566079;
  --maxw: 820px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  background-attachment: fixed;
  display: flex;
  justify-content: center;
  padding: 56px 24px;
}

.card {
  width: 100%;
  max-width: var(--maxw);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 56px clamp(28px, 6vw, 72px) 40px;
  box-shadow: 0 24px 60px rgba(21, 42, 94, 0.1);
}

/* ---------- header ---------- */
.header {
  text-align: center;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 34px;
}

.logo {
  width: clamp(180px, 32vw, 240px);
  height: auto;
}

.subtitle {
  margin-top: 18px;
  font-size: 18px;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: 0.3px;
}

.updated {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-dim);
}

/* ---------- tldr highlight ---------- */
.tldr {
  background: var(--blue-light);
  border: 1px solid #cfe1f3;
  border-left: 4px solid var(--blue);
  border-radius: 12px;
  padding: 22px 26px;
  margin-bottom: 38px;
}

.tldr h2 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--blue);
  margin-bottom: 10px;
  font-weight: 700;
}

.tldr p {
  font-size: 16px;
  color: var(--text);
}

/* ---------- content ---------- */
.content section {
  margin-bottom: 30px;
}

.content h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
  padding-left: 14px;
  border-left: 3px solid var(--blue);
}

.content p {
  color: var(--text-dim);
  margin-bottom: 10px;
}

.content strong {
  color: var(--text);
}

.content ul {
  list-style: none;
  margin: 6px 0 12px;
}

.content li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 8px;
  color: var(--text-dim);
}

.content li::before {
  content: '\2713';
  position: absolute;
  left: 4px;
  color: var(--blue);
  font-weight: 700;
}

.contact a {
  display: inline-block;
  font-weight: 700;
  font-size: 16px;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.contact a:hover {
  border-color: var(--blue);
}

/* ---------- footer ---------- */
.footer {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
}

@media (max-width: 560px) {
  body {
    padding: 28px 14px;
  }
  .card {
    border-radius: 16px;
    padding: 36px 22px 30px;
  }
  .subtitle {
    font-size: 16px;
  }
}