:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #0057b8;
  --primary-soft: #eaf2ff;
  --warning: #b45309;
  --warning-soft: #fff7ed;
  --line: #dbe4f0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Inter', system-ui, sans-serif;
  background: linear-gradient(180deg, #eef3fb, #f8fafc);
  color: var(--text);
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.mail-card {
  width: min(760px, 100%);
  background: var(--card);
  border-radius: 24px;
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.08);
  overflow: hidden;
  border: 1px solid #e7edf5;
}

.brand-bar {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 1rem 1.5rem;
  background: linear-gradient(135deg, #004494, #0057b8);
  color: white;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: rgba(255,255,255,0.15);
  font-weight: 800;
  letter-spacing: 0.05em;
}

.brand-text {
  font-weight: 700;
  opacity: 0.95;
}

.content {
  padding: 2rem;
}

.eyebrow {
  margin: 0 0 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--primary);
}

h1, h2, h3 {
  margin: 0 0 1rem;
  line-height: 1.1;
}

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.04em;
}

h2 {
  font-size: 1.3rem;
}

h3 {
  font-size: 1.05rem;
}

p, li {
  color: var(--muted);
  line-height: 1.65;
}

.lead {
  font-size: 1.05rem;
}

.notice,
.warning-box,
.steps {
  border-radius: 18px;
  padding: 1.2rem 1.25rem;
  margin-top: 1.25rem;
}

.notice {
  background: var(--primary-soft);
  border: 1px solid #d5e5ff;
}

.steps {
  background: #f8fafc;
  border: 1px solid var(--line);
}

.steps ol {
  margin: 0;
  padding-left: 1.2rem;
}

.warning-box {
  background: var(--warning-soft);
  border: 1px solid #fed7aa;
}

.warning-box h3 {
  color: var(--warning);
}

.footer-note {
  margin-top: 1.5rem;
  font-size: 0.95rem;
}