:root {
  --bg: #f6f8fc;
  --surface: #ffffff;

  --text: #0f172a;
  --muted: #475569;

  --border: #e2e8f0;

  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --accent-hover: rgba(37, 99, 235, 0.15);
}

body {
  font-family: "Montserrat", sans-serif;
  font-size: 16px;
  color: var(--text);
  line-height: 1.6;
  background: radial-gradient(
      1200px 600px at 50% -10%,
      rgba(37, 99, 235, 0.06),
      transparent 60%
    ),
    var(--bg);
  margin: 0;
  padding: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

p {
  margin-bottom: 1rem;
  color: var(--muted);
}

main {
  max-width: 960px;
  margin: 25px auto 50px;
  padding: 0 15px;
}

.about-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
}

.custom-card {
  margin-bottom: 30px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--surface);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.custom-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

.custom-card i {
  opacity: 0.9;
}

.card .btn {
  padding: 9px 16px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;

  display: inline-flex;
  width: fit-content;
  max-width: 100%;

  align-items: center;
  justify-content: center;

  background-color: var(--accent-soft);
  color: var(--accent);

  border: 1px solid rgba(37, 99, 235, 0.25);
  box-shadow: none;

  margin: 0 auto;

  transition: background-color 0.2s ease, border-color 0.2s ease,
    color 0.2s ease;
}

.card .btn:hover {
  background-color: var(--accent-hover);
  border-color: rgba(37, 99, 235, 0.45);
  color: var(--accent);
}

.card .btn-ss,
.card .btn-sia,
.card .btn-e {
  background-color: var(--accent-soft);
  color: var(--accent);
}

.card-title .store-name {
  display: block;
  font-weight: 500;
  color: var(--muted);
}

footer {
  border-top: 1px solid var(--border);
  background: transparent;
  padding: 20px 0;
  margin-top: 50px;
  color: var(--muted);
}

footer h5 {
  color: var(--text);
}

.copy {
  font-size: 12px;
  color: var(--muted);
}