:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-2: #273449;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #22c55e;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

a {
  color: var(--primary);
}

h1,
h2,
h3 {
  margin: 0 0 0.5em;
}

p {
  margin: 0.4em 0;
}

.muted {
  color: var(--muted);
}

.error {
  color: var(--danger);
  font-weight: 500;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}

.topbar h1 {
  font-size: 1.2rem;
  margin: 0;
}

.row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.row.between {
  justify-content: space-between;
}

.row.wrap {
  flex-wrap: wrap;
}

.gap {
  gap: 8px;
}

.back {
  margin-bottom: 12px;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: var(--radius);
  padding: 10px 16px;
  background: var(--surface-2);
  color: var(--text);
  transition: background 0.15s, transform 0.05s;
}

button:hover {
  background: #324361;
}

button:active {
  transform: translateY(1px);
}

button.primary {
  background: var(--primary);
  color: white;
}

button.primary:hover {
  background: var(--primary-hover);
}

button.danger {
  background: var(--danger);
  color: white;
}

button.danger:hover {
  background: var(--danger-hover);
}

button.ghost {
  background: transparent;
  border: 1px solid var(--border);
}

button.ghost:hover {
  background: var(--surface-2);
}

input[type="text"],
input[type="password"],
input[type="url"],
input[type="file"] {
  width: 100%;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font: inherit;
}

input:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

label {
  display: block;
  margin: 12px 0;
  font-weight: 500;
}

label.radio {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 400;
  cursor: pointer;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin: 16px 0;
}

legend {
  padding: 0 6px;
  color: var(--muted);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.narrow {
  max-width: 380px;
  width: 100%;
}

.centered {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.qr-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.05s;
}

.qr-card:hover {
  border-color: var(--primary);
}

.qr-card .name {
  font-weight: 600;
  margin-bottom: 4px;
  word-break: break-word;
}

.qr-card .meta {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 12px;
}

.qr-card .counts {
  display: flex;
  gap: 16px;
  font-size: 0.9rem;
}

.qr-card .counts strong {
  display: block;
  font-size: 1.4rem;
  color: var(--primary);
}

.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin: 20px 0;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  color: var(--muted);
  font-size: 0.85rem;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text);
}

.qr-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: white;
  padding: 24px;
  border-radius: var(--radius);
  margin: 20px 0;
  max-width: 320px;
}

.qr-display canvas {
  max-width: 100%;
  height: auto;
}

.qr-status {
  color: var(--danger);
  font-size: 0.85rem;
  margin: 8px 0 0;
  text-align: center;
}

.chart-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  position: relative;
  height: 320px;
}

form button[type="submit"] {
  margin-top: 16px;
}