:root {
  color-scheme: dark;
  --bg: #0f1115;
  --card: #171a21;
  --accent: #00b38f;
  --text: #e8eaed;
  --muted: #9aa0a6;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  padding: 2.5rem 1.5rem 1.5rem;
  text-align: center;
}

header h1 {
  margin: 0 0 0.5rem;
  color: var(--accent);
}

header p {
  color: var(--muted);
  margin: 0;
}

main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1rem 1.5rem 3rem;
}

.username-bar {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.username-bar input {
  background: var(--card);
  border: 1px solid #2a2e37;
  color: var(--text);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 1rem;
  min-width: 240px;
}

.category {
  margin-bottom: 2rem;
}

.category h2 {
  color: var(--accent);
  border-bottom: 1px solid #2a2e37;
  padding-bottom: 0.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 1rem;
}

.product {
  background: var(--card);
  border: 1px solid #2a2e37;
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.product h3 {
  margin: 0;
}

.product p {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
  flex-grow: 1;
}

.price {
  font-size: 1.3rem;
  font-weight: bold;
  color: var(--accent);
}

button {
  background: var(--accent);
  color: #04140f;
  border: none;
  padding: 0.7rem 1rem;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.1);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.status {
  text-align: center;
  color: var(--muted);
  min-height: 1.5rem;
}

.center-page {
  max-width: 500px;
  margin: 4rem auto;
  text-align: center;
  padding: 0 1.5rem;
}

.center-page a {
  color: var(--accent);
}