:root {
  --bg: #0d1117;
  --panel: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #9aa5b1;
  --accent: #4fb3a4;
  --accent-bright: #7cf0dd;
  --sell: #f2836b;
  --buy: #7cf0dd;
}

* { box-sizing: border-box; }

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

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 1.1rem;
  margin: 0;
  color: var(--accent-bright);
  cursor: pointer;
}

nav a {
  color: var(--text-dim);
  text-decoration: none;
  margin-left: 1.25rem;
  font-size: 0.9rem;
}
nav a:hover { color: var(--accent-bright); }

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem;
}

.category-section {
  border-bottom: 1px solid var(--border);
}
.category-header {
  padding: 0.75rem 0;
  cursor: pointer;
  color: var(--accent-bright);
  font-weight: 600;
  display: flex;
  justify-content: space-between;
}
.category-body { display: none; padding-left: 1rem; }
.category-body.open { display: block; }

.leaf-header {
  padding: 0.5rem 0;
  cursor: pointer;
  color: var(--text);
  display: flex;
  justify-content: space-between;
}
.leaf-header .count { color: var(--text-dim); font-size: 0.85rem; }
.leaf-body { display: none; }
.leaf-body.open { display: block; }

.item-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.5rem;
  padding: 0.5rem 0 1rem;
}
.item-tile {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem;
  cursor: pointer;
  font-size: 0.85rem;
}
.item-tile:hover { border-color: var(--accent); }

.item-detail {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
}
.item-detail h2 { margin-top: 0; }
.price-row {
  display: flex;
  gap: 2rem;
  margin: 1rem 0;
}
.price-stat .label { color: var(--text-dim); font-size: 0.8rem; }
.price-stat .value { font-size: 1.4rem; font-weight: 600; }
.price-stat.sell .value { color: var(--sell); }
.price-stat.buy .value { color: var(--buy); }

.window-tabs { display: flex; gap: 0.5rem; margin: 1rem 0 0.5rem; }
.window-tabs button {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 0.3rem 0.75rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
}
.window-tabs button.active { border-color: var(--accent); color: var(--accent-bright); }

.badge {
  display: inline-block;
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.badge.free { background: #30363d; color: var(--text-dim); }
.badge.premium { background: #2d4a3e; color: var(--accent-bright); }

form.auth-form {
  max-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
form.auth-form input {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem;
  border-radius: 4px;
}
form.auth-form button, .btn {
  background: var(--accent);
  border: none;
  color: #04211c;
  font-weight: 600;
  padding: 0.55rem;
  border-radius: 4px;
  cursor: pointer;
}
form.auth-form button:hover, .btn:hover { background: var(--accent-bright); }

.error-msg { color: var(--sell); font-size: 0.85rem; }
.hint { color: var(--text-dim); font-size: 0.85rem; }

a.back-link { color: var(--text-dim); font-size: 0.85rem; text-decoration: none; }
a.back-link:hover { color: var(--accent-bright); }