:root {
  --blue: rgba(33, 150, 243, 0.85);
  --blue-light: rgba(33, 150, 243, 0.08);
  --blue-border: rgba(33, 150, 243, 0.2);
  --text: #1a1a2e;
  --muted: #64748b;
  --bg: #f8faff;
  --white: #ffffff;
  --radius: 14px;
}

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

body {
  font-family: 'Nunito', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── HEADER ─── */
header {
  background: var(--white);
  border-bottom: 1px solid var(--blue-border);
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 12px rgba(33,150,243,0.07);
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--blue);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.back-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1.5px solid var(--blue-border);
  border-radius: 8px;
  transition: background 0.2s;
}
.back-link:hover { background: var(--blue-light); }

/* ─── MAIN ─── */
main {
  flex: 1;
  max-width: 780px;
  width: 100%;
  margin: 0 auto;
  padding: 48px 32px 64px;
}

/* ─── PAGE TITLE ─── */
.page-title {
  text-align: center;
  margin-bottom: 40px;
}

.page-title h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--blue);
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.page-title p {
  margin-top: 10px;
  font-size: 0.95rem;
  color: var(--muted);
}

/* ─── INTRO ─── */
.intro {
  background: var(--blue-light);
  border-left: 4px solid var(--blue);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 18px 22px;
  margin-bottom: 36px;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
}

/* ─── SECTIONS ─── */
.section {
  background: var(--white);
  border: 1px solid var(--blue-border);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin-bottom: 20px;
  transition: box-shadow 0.2s;
}
.section:hover { box-shadow: 0 4px 20px rgba(33,150,243,0.08); }

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.section-number {
  background: var(--blue);
  color: white;
  font-weight: 800;
  font-size: 0.8rem;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.section h2 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.section p, .section ul {
  font-size: 0.95rem;
  line-height: 1.75;
  color: #334155;
}

.section ul {
  list-style: none;
  padding: 0;
}

.section ul li {
  padding: 4px 0 4px 18px;
  position: relative;
}

.section ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--blue);
  font-weight: 700;
}

/* ─── CONTACT / LINK ─── */
.contact-block {
  background: var(--white);
  border: 1px solid var(--blue-border);
  border-radius: var(--radius);
  padding: 22px 28px;
  margin-bottom: 20px;
  font-size: 0.95rem;
  line-height: 1.75;
  color: #334155;
}

a.inline-link {
  color: var(--blue);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}
a.inline-link:hover { opacity: 0.75; }

/* ─── FOOTER ─── */
footer {
  text-align: center;
  padding: 24px;
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--blue-border);
}

/* ─── RESPONSIVE ─── */
@media (max-width: 600px) {
  main { padding: 28px 16px 48px; }
  .page-title h1 { font-size: 1.5rem; }
  header { padding: 0 16px; }
  .section, .contact-block { padding: 18px 16px; }
}