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

:root {
  --bg: #0c0c0c;
  --card-bg: #181818;
  --card-border: #2a2a2a;
  --card-shadow: rgba(0, 0, 0, 0.4);
  --text: #d4d4d4;
  --text-muted: #8a8a8a;
  --text-heading: #ffffff;
  --accent: #6e8efb;
  --accent-hover: #8da4fc;
  --radius: 12px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Page wrapper */
.page {
  width: 100%;
  max-width: 640px;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Cards */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: 0 2px 8px var(--card-shadow);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  border-color: #3a3a3a;
  box-shadow: 0 4px 16px var(--card-shadow);
}

/* Hero card */
.hero-card {
  padding: 3rem 2rem;
  text-align: center;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #1a1a2e 100%);
  border-color: #2a2a4a;
}

.hero-card:hover {
  border-color: #3a3a5a;
}

.hero-card h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  letter-spacing: 0.02em;
}

/* Card grid */
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

/* Card icon */
.card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  opacity: 0.7;
}

/* Card content */
.card h2 {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.625rem;
}

.card p {
  font-size: 0.9375rem;
  color: var(--text);
  line-height: 1.7;
}

.card a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

.card a:hover {
  color: var(--accent-hover);
}

/* PGP section inside email card */
.pgp-section {
  margin-top: 1rem;
  padding-top: 0.875rem;
  border-top: 1px solid var(--card-border);
}

.pgp-section h3 {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.375rem;
}

.pgp-fingerprint {
  font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas,
    "DejaVu Sans Mono", monospace;
  font-size: 0.6875rem !important;
  letter-spacing: 0.03em;
  color: var(--text-muted) !important;
  word-break: break-all;
  margin-bottom: 0.5rem;
}

.pgp-download {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  border: 1px solid var(--card-border);
  border-radius: 5px;
  text-decoration: none;
  transition: background-color 0.2s ease, border-color 0.2s ease,
    color 0.2s ease;
}

.pgp-download:hover {
  background-color: rgba(110, 142, 251, 0.1);
  border-color: var(--accent);
  color: var(--accent-hover);
}

/* Footer */
footer {
  text-align: center;
  padding: 1rem 0 0;
}

footer p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 520px) {
  .page {
    padding: 1.5rem 1rem;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .hero-card {
    padding: 2.5rem 1.5rem;
  }

  .hero-card h1 {
    font-size: 1.625rem;
  }

  .card {
    padding: 1.5rem;
  }
}