:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #f3f4f6;
  --border: #e3e6ea;
  --border-strong: #d3d8df;
  --text: #1b2330;
  --muted: #667085;
  --accent: #2563eb;
  --accent-weak: #eef3fe;
  --green: #17976a;
  --amber: #c98a12;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 1px 3px rgba(16, 24, 40, 0.06);
  --gap: 1rem;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

/* ---------- top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding: 0.7rem 1.25rem;
  padding-top: max(0.7rem, env(safe-area-inset-top));
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 1.05rem; letter-spacing: -0.01em; }
.actions { display: flex; gap: 0.5rem; }

.pill {
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.pill:hover { background: var(--surface-2); }
.pill:disabled { opacity: 0.55; cursor: default; }
.pill.ghost { border-color: var(--border); color: var(--muted); }
.pill.ghost:hover { color: var(--text); }
.pill.small { font-size: 0.8rem; padding: 0.32rem 0.65rem; }
.pill.is-connecting { color: var(--muted); }
.pill.is-connected { border-color: var(--green); color: var(--green); background: #edf8f3; }
.pill.is-disconnected { border-color: var(--amber); color: var(--amber); background: #fdf6e8; }

/* ---------- layout ---------- */
main {
  max-width: 48rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
  padding-bottom: max(2rem, env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.match-btn {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font: inherit;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius);
  border: 1px solid #1d4ed8;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
}
.match-btn:hover { background: #1d4ed8; }
.match-btn:active { transform: translateY(1px); }
.match-btn:disabled { opacity: 0.75; cursor: default; }

/* Spinner is absolutely positioned so showing it never resizes the button or
   shifts the centered label. Appears only after ~1s (JS toggles .loading). */
.match-btn .spinner {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  width: 1.05em;
  height: 1.05em;
  margin-top: -0.525em;
  border: 2px solid rgba(255, 255, 255, 0.45);
  border-top-color: #fff;
  border-radius: 50%;
  opacity: 0;
  transition: opacity 0.15s;
}
.match-btn.loading .spinner { opacity: 1; animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- result / stacked scan-over-match hero ---------- */
.result { width: 100%; }
.combo {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.combo-swatch {
  height: clamp(300px, 46vh, 460px);
  display: flex;
  flex-direction: column;
}
.combo-scan {
  flex: 0 0 25%;
  position: relative;
  border-bottom: 1px solid rgba(0, 0, 0, 0.12);
  /* match the card's inner radius so the top corners don't bleed square */
  border-radius: calc(var(--radius) - 1px) calc(var(--radius) - 1px) 0 0;
}
.combo-match { flex: 1 1 75%; }
.combo-tag {
  position: absolute;
  left: 0.6rem;
  top: 0.5rem;
  font-size: 0.72rem;
  color: #fff;
  background: rgba(27, 35, 48, 0.72);
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  backdrop-filter: blur(2px);
}
.combo-tag .mono { font-size: 0.72rem; }
.combo-tag .info {
  margin-left: 0.35rem;
  color: #fff;
  text-decoration: none;
  opacity: 0.75;
  font-size: 0.85rem;
  line-height: 1;
  cursor: help;
}
.combo-tag .info:hover { opacity: 1; }
.combo-info { padding: 0.9rem 1.1rem 1.1rem; display: flex; flex-direction: column; gap: 0.5rem; }
.match-head { display: flex; align-items: center; gap: 0.4rem; }
.match-name { font-weight: 650; font-size: 1.1rem; color: var(--text); }
.warn-badge { color: #b45309; cursor: help; font-size: 0.95rem; line-height: 1; }

.closeness { display: flex; flex-direction: column; gap: 0.35rem; margin-top: 0.15rem; }
.meter {
  height: 7px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  overflow: hidden;
}
.meter > span {
  display: block;
  height: 100%;
  width: calc(var(--score, 0) * 1%);
  background: linear-gradient(90deg, var(--amber), var(--green));
  transition: width 0.3s ease;
}
.close-label { font-size: 0.85rem; color: var(--muted); }

/* ---------- panels ---------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow);
}
.panel-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.85rem; }
.panel-head h2 { margin: 0; font-size: 0.95rem; font-weight: 650; letter-spacing: -0.01em; }

/* ---------- gallery ---------- */
.gallery {
  display: flex;
  align-items: stretch; /* equal-height cards despite varying meta lines */
  gap: 0.75rem;
  overflow-x: auto;
  padding-bottom: 0.4rem;
  scroll-snap-type: x proximity;
}
.gallery:empty::after { content: 'Tap “Match Color” to scan.'; color: var(--muted); font-size: 0.9rem; }
.gallery-note { margin: 0; padding: 0.4rem 0.25rem; font-size: 0.9rem; }
.card {
  display: flex;
  flex-direction: column;
  flex: 0 0 auto;
  width: 9rem;
  scroll-snap-align: start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
  overflow: hidden;
  cursor: pointer;
  text-align: left;
  color: inherit;
  font: inherit;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.1s;
}
.card:hover { border-color: var(--border-strong); box-shadow: var(--shadow); transform: translateY(-1px); }
/* Single outline ring — uniform on all sides (border+shadow stacked unevenly at
   fractional device-pixel ratios) and no layout shift when selection moves. */
.card.selected { border-color: var(--accent); outline: 2px solid var(--accent); outline-offset: -1px; }
.card-swatch {
  width: 100%;
  aspect-ratio: 3 / 2;
  border-bottom: 1px solid var(--border);
  /* round top corners to the card's inner radius so the swatch doesn't poke
     square corners past the (highlighted) rounded border */
  border-radius: calc(var(--radius) - 1px) calc(var(--radius) - 1px) 0 0;
}
.card-swatch.oog { position: relative; }
.card-swatch.oog::after {
  content: '≈';
  position: absolute; top: 3px; right: 5px;
  font-size: 0.75rem; color: rgba(0, 0, 0, 0.4);
}
.card-meta { flex: 1 1 auto; padding: 0.55rem 0.65rem; display: flex; flex-direction: column; gap: 0.15rem; }
.card-name { font-size: 0.85rem; font-weight: 600; line-height: 1.25; }
.card-code { font-size: 0.75rem; font-weight: 600; color: var(--text); }
.card-sys { font-size: 0.72rem; color: var(--muted); }
.card-de { font-size: 0.72rem; color: var(--muted); margin-top: 0.1rem; }

/* ---------- filters ---------- */
summary { cursor: pointer; font-weight: 600; font-size: 0.92rem; }
.filter-list {
  display: flex;
  flex-direction: column;
  margin-top: 0.75rem;
}
.chk {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.9rem;
  padding: 0.5rem 0.35rem;
  border-bottom: 1px solid var(--border); /* row lines to connect name → count */
  cursor: pointer;
}
.chk:last-child { border-bottom: none; }
.chk:hover { background: var(--surface-2); }
.chk input { accent-color: var(--accent); flex: 0 0 auto; }
.chk-name {
  flex: 1 1 auto;
  min-width: 0; /* allow the ellipsis to kick in */
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.chk-count { flex: 0 0 auto; color: var(--muted); font-size: 0.8rem; font-variant-numeric: tabular-nums; }

/* ---------- history ---------- */
.history-list { display: flex; flex-direction: column; gap: 0.45rem; }
.hist-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.55rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 9px;
  cursor: pointer;
  color: inherit;
  font: inherit;
  text-align: left;
  transition: border-color 0.15s, background 0.15s;
}
.hist-row:hover { border-color: var(--border-strong); background: var(--surface-2); }
.hist-sw { width: 2.2rem; height: 2.2rem; border-radius: 7px; border: 1px solid var(--border-strong); flex: 0 0 auto; }
.hist-main { display: flex; flex-direction: column; flex: 1 1 auto; font-size: 0.9rem; font-weight: 500; }
.hist-sub { font-size: 0.75rem; color: var(--muted); font-weight: 400; }
.hist-time { font-size: 0.75rem; color: var(--muted); }

/* ---------- misc ---------- */
.muted { color: var(--muted); }
.small { font-size: 0.8rem; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.78rem; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%) translateY(2rem);
  background: #1b2330;
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 9px;
  font-size: 0.88rem;
  box-shadow: 0 8px 24px rgba(16, 24, 40, 0.18);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  max-width: calc(100vw - 2rem);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.success { background: var(--green); color: #fff; }
.toast.warn { background: #f5b301; color: #1b2330; font-weight: 500; } /* yellow warning */
.toast.error { background: #dc2626; color: #fff; font-weight: 500; }

/* ---------- landing pages ---------- */
.lp h1 { font-size: 1.7rem; letter-spacing: -0.02em; margin: 0.25rem 0 0.5rem; }
.lp .lead { font-size: 1.05rem; color: var(--muted); line-height: 1.55; margin: 0 0 1rem; }
.lp .panel h2 { margin: 0 0 0.6rem; font-size: 1.05rem; }
.lp .panel p { margin: 0.4rem 0; line-height: 1.55; }
.lp .panel details { margin: 0.35rem 0; }
.lp .panel summary { cursor: pointer; font-weight: 500; }
.lp .panel summary + p { color: var(--muted); }
.cta {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid #1d4ed8;
  box-shadow: var(--shadow);
}
.cta:hover { background: #1d4ed8; }

/* ---------- SEO / info footer ---------- */
.site-footer {
  max-width: 48rem;
  margin: 1.5rem auto 3rem;
  padding: 1.5rem 1.25rem 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.55;
}
.site-footer h2 { font-size: 0.9rem; color: var(--text); margin: 1.1rem 0 0.35rem; }
.site-footer h2:first-child { margin-top: 0; }
.site-footer p { margin: 0.35rem 0; }
.site-footer a { color: var(--accent); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.site-footer code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.8em;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.05rem 0.3rem;
  word-break: break-all;
}
.site-footer details { margin: 0.25rem 0; }
.site-footer summary { cursor: pointer; color: var(--text); font-weight: 500; font-size: 0.85rem; }
.site-footer summary + p { margin-top: 0.25rem; }
.site-footer .fine { margin-top: 1.25rem; font-size: 0.78rem; opacity: 0.85; }

.footer-links { margin-top: 1rem; display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.linkish { background: none; border: none; padding: 0; font: inherit; font-size: 0.85rem; color: var(--accent); cursor: pointer; }
.linkish:hover { text-decoration: underline; }
.footer-links .copy { margin-left: auto; opacity: 0.8; }

/* ---------- modals (About / Legal) ---------- */
.modal {
  max-width: 34rem;
  width: calc(100% - 2rem);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
  color: var(--text);
  background: var(--surface);
  box-shadow: 0 20px 60px rgba(16, 24, 40, 0.25);
}
.modal::backdrop { background: rgba(16, 24, 40, 0.45); }
.modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--border);
}
.modal-head h2 { margin: 0; font-size: 1.05rem; }
.modal-x { background: none; border: none; font-size: 1rem; cursor: pointer; color: var(--muted); padding: 0.2rem 0.45rem; border-radius: 6px; }
.modal-x:hover { background: var(--surface-2); color: var(--text); }
.modal-body { padding: 1.1rem 1.25rem 1.4rem; font-size: 0.9rem; line-height: 1.6; color: var(--muted); max-height: 70vh; overflow-y: auto; }
.modal-body p { margin: 0.5rem 0; }
.modal-body strong { color: var(--text); }
.modal-body ul { margin: 0.5rem 0; padding-left: 1.2rem; }
.modal-body li { margin: 0.25rem 0; }
.modal-body a { color: var(--accent); text-decoration: none; }
.modal-body a:hover { text-decoration: underline; }
.modal-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.85em;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 4px; padding: 0.05rem 0.3rem;
}
.modal-body .fine { margin-top: 0.9rem; font-size: 0.8rem; opacity: 0.85; }

@media (max-width: 30rem) {
  .compare { grid-template-columns: 1fr; }
}