:root {
  --bg: var(--tg-theme-bg-color, #0f0f12);
  --bg-secondary: var(--tg-theme-secondary-bg-color, #1a1a1f);
  --text: var(--tg-theme-text-color, #ffffff);
  --hint: var(--tg-theme-hint-color, #8a8a92);
  --link: var(--tg-theme-link-color, #6ab7ff);
  --button: var(--tg-theme-button-color, #3fa9f5);
  --button-text: var(--tg-theme-button-text-color, #ffffff);
  --card-radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding-bottom: 70px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: var(--bg);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.topbar h1 { font-size: 18px; margin: 0; font-weight: 600; }
.back-btn {
  background: var(--bg-secondary);
  color: var(--text);
  border: none;
  border-radius: 10px;
  width: 34px; height: 34px;
  font-size: 18px;
  cursor: pointer;
}

#app { padding: 12px 16px 24px; max-width: 680px; margin: 0 auto; }

.loading, .empty, .error {
  text-align: center;
  color: var(--hint);
  padding: 40px 10px;
}

.cat-grid, .prod-list { display: flex; flex-direction: column; gap: 10px; }

.card {
  background: var(--bg-secondary);
  border-radius: var(--card-radius);
  padding: 14px 16px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.card:active { opacity: 0.7; }
.card .title { font-size: 15px; font-weight: 500; }
.card .sub { font-size: 13px; color: var(--hint); margin-top: 2px; }
.card .price { font-weight: 600; white-space: nowrap; }

.product-card {
  background: var(--bg-secondary);
  border-radius: var(--card-radius);
  padding: 18px;
}
.product-card h2 { margin: 0 0 10px; font-size: 19px; }
.product-card .desc { color: var(--hint); margin-bottom: 14px; font-size: 14px; }
.product-card .row { display: flex; justify-content: space-between; padding: 8px 0; border-top: 1px solid rgba(255,255,255,0.06); font-size: 14px; }
.product-card .row:first-of-type { border-top: none; }
.product-card .row b { font-size: 15px; }

.supplier-block {
  margin-top: 14px;
  padding: 12px 14px;
  background: rgba(255,255,255,0.04);
  border-radius: 10px;
}
.supplier-block .sup-name { font-weight: 600; margin-bottom: 4px; }
.supplier-block .sup-rating { color: var(--hint); font-size: 13px; margin-bottom: 8px; }
.review { font-size: 13px; padding: 6px 0; border-top: 1px dashed rgba(255,255,255,0.08); }
.review:first-of-type { border-top: none; }

.buy-btn {
  display: block;
  width: 100%;
  margin-top: 16px;
  padding: 14px;
  border: none;
  border-radius: 12px;
  background: var(--button);
  color: var(--button-text);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.profile-card {
  background: var(--bg-secondary);
  border-radius: var(--card-radius);
  padding: 20px;
  text-align: center;
}
.profile-card .balance { font-size: 32px; font-weight: 700; margin: 6px 0 2px; }
.profile-card .balance-label { color: var(--hint); font-size: 13px; }
.ref-box {
  margin-top: 16px;
  background: rgba(255,255,255,0.04);
  border-radius: 10px;
  padding: 12px;
  font-size: 13px;
  word-break: break-all;
}
.copy-btn {
  margin-top: 10px;
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 10px;
  background: var(--button);
  color: var(--button-text);
  font-weight: 600;
  cursor: pointer;
}

.bottomnav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  display: flex;
  background: var(--bg-secondary);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 6px 0 max(6px, env(safe-area-inset-bottom));
}
.nav-btn {
  flex: 1;
  background: none;
  border: none;
  color: var(--hint);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 11px;
  padding: 6px 0;
  cursor: pointer;
}
.nav-btn .nav-icon { font-size: 20px; }
.nav-btn.active { color: var(--link); }