:root {
  --bg: #f3f5fb;
  --surface: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --primary: #1d4ed8;
  --primary-press: #1e40af;
  --border: #e5e7eb;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(2, 6, 23, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  width: min(100%, 920px);
  margin: 0 auto;
  padding: 16px;
}

h1,
h2,
h3,
p {
  margin: 0;
}

.header {
  margin-bottom: 14px;
}

.lead {
  color: var(--muted);
  margin-top: 8px;
  line-height: 1.45;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.store-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}

.store-logo {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
  margin-bottom: 10px;
}

.logo-pyaterochka { background: #ef4444; }
.logo-magnit { background: #b91c1c; }
.logo-fix { background: #7c3aed; }
.logo-perekrestok { background: #16a34a; }
.logo-lenta { background: #0369a1; }

.store-card h2 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.store-card p {
  color: var(--muted);
  margin-bottom: 12px;
}

.button,
.open-card {
  appearance: none;
  border: 0;
  border-radius: 10px;
  min-height: 50px;
  padding: 12px 14px;
  width: 100%;
  background: var(--primary);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.button:hover,
.button:active,
.open-card:hover,
.open-card:active {
  background: var(--primary-press);
}

.top-nav {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.back-link,
.all-cards-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
}

.barcode-box,
.info-box,
.faq-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.small-card-image {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 8px auto 12px;
  border-radius: 10px;
}

.info-box ul {
  margin: 8px 0 0;
  padding-left: 20px;
  line-height: 1.45;
}

.faq-item + .faq-item {
  margin-top: 10px;
}

.faq-item p {
  margin-top: 6px;
  color: var(--muted);
}

.fullscreen-card {
  background: #fff;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.fullscreen-card .small-card-image {
  width: 100%;
  max-width: none;
  max-height: none;
  transform: scale(2.4);
  transform-origin: center 78%;
  border-radius: 0;
  margin: 0;
}

.fullscreen-fallback {
  position: fixed;
  inset: 0;
  z-index: 9999;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #111827;
    --text: #f9fafb;
    --muted: #cbd5e1;
    --primary: #3b82f6;
    --primary-press: #2563eb;
    --border: #1f2937;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  }

  .fullscreen-card {
    background: #000;
  }
}

@media (min-width: 720px) {
  .container {
    padding: 24px;
  }

  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}