:root {
  --navy:      #0F2D52;
  --navy-mid:  #1E3A5F;
  --navy-light:#2D4F7A;
  --sky:       #7DD3FC;
  --blue-light:#93C5FD;
  --bg:        #EEF2F7;
  --card-bg:   #FFFFFF;
  --text:      #1F2937;
  --text-muted:#6B7280;
  --border:    #E5E7EB;
  --purple:    #7C3AED;
  --red:       #DC2626;
  --teal:      #0D9488;
  --cyan:      #0891B2;
  --green:     #059669;
  --radius:    10px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

/* ── Nav ─────────────────────────────────────────────────────────────────── */
nav {
  background: var(--navy);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-brand {
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  text-decoration: none;
  letter-spacing: -0.3px;
}
.nav-brand span { color: var(--sky); }
.nav-links { display: flex; gap: 24px; }
.nav-links a {
  font-size: 13px;
  font-weight: 600;
  color: var(--blue-light);
  text-decoration: none;
  letter-spacing: 0.3px;
}
.nav-links a:hover { color: #fff; }

/* ── Layout ──────────────────────────────────────────────────────────────── */
.container { max-width: 860px; margin: 0 auto; padding: 0 20px; }

/* ── Hero ────────────────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
  padding: 64px 24px 56px;
  text-align: center;
  color: #fff;
}
.hero-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--sky);
  margin-bottom: 16px;
}
.hero h1 {
  font-size: 38px;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.hero p {
  font-size: 17px;
  color: var(--blue-light);
  max-width: 520px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

/* ── Subscribe form ──────────────────────────────────────────────────────── */
.subscribe-form {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}
.subscribe-form input[type="email"] {
  padding: 12px 18px;
  border-radius: 8px;
  border: 2px solid transparent;
  font-size: 15px;
  width: 280px;
  outline: none;
  background: rgba(255,255,255,0.12);
  color: #fff;
}
.subscribe-form input[type="email"]::placeholder { color: var(--blue-light); }
.subscribe-form input[type="email"]:focus { border-color: var(--sky); background: rgba(255,255,255,0.18); }
.btn {
  padding: 12px 22px;
  border-radius: 8px;
  border: none;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: opacity 0.15s;
}
.btn:hover { opacity: 0.88; }
.btn-primary { background: var(--sky); color: var(--navy); }
.btn-purple  { background: var(--purple); color: #fff; }
.hero-note { font-size: 12px; color: var(--blue-light); margin-top: 12px; opacity: 0.8; }

/* ── Section labels ──────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 20px;
  color: #fff;
}
.badge-A { background: var(--red); }
.badge-B { background: var(--purple); }
.badge-C { background: var(--cyan); }
.badge-D { background: var(--teal); }
.badge-E { background: var(--green); }

/* ── Cards ───────────────────────────────────────────────────────────────── */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 24px;
  margin-bottom: 16px;
  transition: box-shadow 0.15s;
}
.card:hover { box-shadow: 0 4px 20px rgba(15,45,82,0.1); }
.card-date { font-size: 12px; color: var(--text-muted); margin-bottom: 8px; }
.card-theme { font-size: 17px; font-weight: 700; color: var(--navy); margin-bottom: 10px; line-height: 1.4; }
.card-meta { font-size: 12px; color: var(--text-muted); display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 14px; }
.card-link { font-size: 13px; font-weight: 600; color: var(--purple); text-decoration: none; }
.card-link:hover { text-decoration: underline; }

/* ── Latest issue preview ────────────────────────────────────────────────── */
.latest-section { padding: 48px 0 32px; }
.section-title { font-size: 13px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--text-muted); margin-bottom: 20px; }

/* ── Archive grid ────────────────────────────────────────────────────────── */
.archive-section { padding: 40px 0 60px; }
.page-header { padding: 36px 0 24px; border-bottom: 2px solid var(--border); margin-bottom: 32px; }
.page-header h1 { font-size: 28px; font-weight: 800; color: var(--navy); }
.page-header p  { color: var(--text-muted); margin-top: 6px; }

/* ── Issue viewer ────────────────────────────────────────────────────────── */
.issue-banner {
  background: var(--navy);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.issue-banner p { font-size: 13px; color: var(--blue-light); }
.issue-content { padding: 32px 0 60px; }

/* ── Utility pages ───────────────────────────────────────────────────────── */
.util-page { min-height: 70vh; display: flex; align-items: center; justify-content: center; padding: 40px 20px; }
.util-box { background: var(--card-bg); border-radius: 12px; border: 1px solid var(--border); padding: 48px 40px; max-width: 480px; text-align: center; }
.util-box h2 { font-size: 24px; font-weight: 800; color: var(--navy); margin-bottom: 12px; }
.util-box p { color: var(--text-muted); margin-bottom: 20px; line-height: 1.7; }
.util-icon { font-size: 40px; margin-bottom: 16px; }

/* ── Footer ──────────────────────────────────────────────────────────────── */
footer {
  background: var(--navy);
  color: var(--blue-light);
  padding: 28px 24px;
  text-align: center;
  font-size: 12px;
  line-height: 1.8;
}
footer a { color: var(--sky); text-decoration: none; }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .hero h1 { font-size: 26px; }
  .subscribe-form input[type="email"] { width: 100%; }
  .subscribe-form { flex-direction: column; align-items: center; }
  .hero { padding: 48px 20px 40px; }
}