:root {
  --bg: #0e0f11;
  --surface: #121317;
  --card: #14161a;
  --text: #eef0f3;
  --muted: #a5a7ad;
  --accent: #f59e0b;
  --success: #10b981;
  --danger: #ef4444;
  --border: #23262b;

  /* spacing scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

/* Base (mobile-first) */
* { box-sizing: border-box; }
html, body { height: 100%; }
html {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.45;
}
body { margin: 0; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 92%, black 8%);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}
.brand-mark {
  display: inline-block;
  width: 28px;
  height: 28px;
  /* SVG is a pure white box via its <rect>. Keep a subtle ring so it reads on white images. */
  filter: drop-shadow(0 0 0 rgba(255,255,255,0.0));
}
.brand-name {
  font-weight: 600;
  letter-spacing: 0.2px;
}

/* Page container */
.page {
  padding: var(--space-5) var(--space-4) var(--space-6);
}

/* Toolbar (title + controls) */
.toolbar {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
.app-title {
  margin: 0;
  font-size: 1.1rem;
}
.hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* Controls: stack on mobile, row on larger screens */
.controls {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}
.btn, .select {
  width: 100%;
  min-height: 44px; /* accessible touch target */
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn-secondary { opacity: 0.95; }
.poll {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}
.poll span { color: var(--muted); font-size: 0.95rem; }

/* Status line */
.status {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: var(--space-3);
  color: var(--muted);
  margin-bottom: var(--space-4);
}
#statusText strong { color: var(--accent); }
.last { text-align: right; }

/* Sections */
h2 {
  margin: 0 0 var(--space-3);
  font-size: 1.05rem;
}
h3 {
  margin: 0 0 var(--space-3);
  font-size: 0.95rem;
  color: var(--muted);
}

/* Lists */
.change-lists {
  display: grid;
  gap: var(--space-4);
}

/* Cards */
.card-grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: 1fr; /* one column on mobile */
  list-style: none;
  padding: 0;
  margin: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr;
  transition: transform .15s ease, border-color .15s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); }

/* White image well */
.thumb {
  aspect-ratio: 1 / 1;
  width: 100%;
  display: block;
  object-fit: contain;
  object-position: center;
  background: #ffffff; /* requested white box behind product imagery */
  padding: 10px;
}

.meta {
  padding: var(--space-3) var(--space-4);
}
.meta h4 {
  margin: 0 0 4px;
  font-size: 0.95rem;
  letter-spacing: .2px;
}
.meta .handle {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--muted);
  font-size: 0.8rem;
}
.meta .badge.added { color: var(--success); }
.meta .badge.removed { color: var(--danger); }

/* Footer */
footer {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

/* Motion & layout polish */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}
/* Reserve image space to avoid layout shift on load */
.thumb { /* already has aspect-ratio; this helps CLS on older browsers */ }

/* Breakpoints (mobile-first) */
@media (min-width: 600px) {
  .app-title { font-size: 1.25rem; }
  .controls {
    grid-template-columns: repeat(3, max-content);
    justify-content: start;
    gap: var(--space-3);
  }
  .btn, .select { width: auto; min-width: 140px; }
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page { padding-left: 56px; padding-right: 56px; }
  .app-title { font-size: 1.35rem; }
  .card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .change-lists { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1200px) {
  .card-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}