:root {
  --bg:        #f4f6fb;
  --surface:   #ffffff;
  --border:    #e2e8f0;
  --text:      #0f172a;
  --text-soft: #64748b;
  --accent:    #2563eb;
  --accent-2:  #1d4ed8;
  --ok:        #16a34a;
  --warn:      #d97706;
  --danger:    #dc2626;
  --shadow:    0 1px 3px rgba(15,23,42,.08), 0 8px 24px -12px rgba(15,23,42,.18);
  --radius:    16px;
  --font:      'Inter', system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body { min-height: 100vh; }

.hidden { display: none !important; }

/* Layout */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.topbar .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.topbar .brand img { width: 28px; height: 28px; }
.topbar nav { display: flex; gap: 8px; align-items: center; }

.container { max-width: 720px; margin: 0 auto; padding: 24px 16px 64px; }
.center-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}
.card h2 { margin: 0 0 4px; font-size: 1.15rem; }
.card .muted { color: var(--text-soft); font-size: .9rem; margin: 0 0 18px; }
.card.auth { width: 100%; max-width: 400px; }

/* Forms */
label { display: block; font-size: .85rem; color: var(--text-soft); margin: 14px 0 6px; }
input, select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font: inherit;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.row { display: flex; gap: 12px; }
.row > * { flex: 1; }
.inline { display: flex; align-items: center; gap: 8px; }
.inline input[type="checkbox"] { width: auto; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 12px;
  font: inherit; font-weight: 600;
  cursor: pointer;
  background: var(--accent); color: #fff;
  transition: background .15s ease;
}
.btn:hover { background: var(--accent-2); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn.secondary { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn.secondary:hover { background: #f8fafc; }
.btn.danger { background: var(--danger); }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.block { width: 100%; }
.btn.big { padding: 16px 22px; font-size: 1.05rem; }

/* Monochrome icons inside buttons. By default (wide screens) the text label is
   shown and the icon is hidden; on phones (see media query) this is swapped. */
.ico { width: 20px; height: 20px; flex: 0 0 auto; }
.btn.big .ico { width: 22px; height: 22px; }
.btn.responsive .ico { display: none; }

/* Badges / status */
.badge {
  display: inline-block; padding: 2px 9px; border-radius: 999px;
  font-size: .72rem; font-weight: 600; border: 1px solid var(--border);
}
.badge.set { color: var(--ok); border-color: #bbf7d0; background: #f0fdf4; }
.badge.unset { color: var(--text-soft); }

.result {
  border-radius: 12px; padding: 14px 16px; margin-top: 14px;
  font-weight: 600; border: 1px solid var(--border); background: #f8fafc;
}
.result.opened { color: var(--ok); border-color: #bbf7d0; background: #f0fdf4; }
.result.mismatch, .result.error { color: var(--danger); border-color: #fecaca; background: #fef2f2; }
.result.warn { color: var(--warn); border-color: #fed7aa; background: #fffbeb; }

/* Plates / events lists */
.list { list-style: none; padding: 0; margin: 14px 0 0; }
.list li {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 12px; margin-bottom: 8px;
}
.list li .plate { font-weight: 700; letter-spacing: .04em; font-family: ui-monospace, monospace; }
.list li .label { color: var(--text-soft); font-size: .85rem; margin-left: 8px; }
.event-outcome { font-size: .8rem; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--border); }
.event-outcome.opened { color: var(--ok); }
.event-outcome.error, .event-outcome.plate_mismatch { color: var(--danger); }
.event-outcome.cooldown, .event-outcome.low_confidence, .event-outcome.no_plate { color: var(--warn); }
time { color: var(--text-soft); font-size: .8rem; }

/* Camera */
.camera-wrap {
  position: relative; border-radius: var(--radius); overflow: hidden;
  background: #0f172a; aspect-ratio: 4 / 3;
}
.camera-wrap video { width: 100%; height: 100%; object-fit: cover; display: block; }
.camera-controls { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }

.error-text { color: var(--danger); font-size: .85rem; margin-top: 8px; min-height: 1em; }
.toggle-link { background: none; border: none; color: var(--accent); cursor: pointer; font: inherit; padding: 0; }
hr { border: none; border-top: 1px solid var(--border); margin: 22px 0; }

/* ---- Phone (portrait): icon-only buttons + stacked input rows ---- */
@media (max-width: 640px) {
  .topbar { padding: 12px 14px; }
  .topbar nav { gap: 6px; }

  /* Swap: hide the text label, show the monochrome icon. */
  .btn.responsive .btn-label { display: none; }
  .btn.responsive { padding: 10px; min-width: 44px; }
  .btn.responsive .ico { display: inline-flex; align-items: center; justify-content: center; }

  /* Auto button: play/stop icon swap driven by the .active class. */
  .btn.responsive .ico-stop { display: none; }
  .btn-auto.active .ico-play { display: none; }
  .btn-auto.active .ico-stop { display: inline-flex; }

  /* Primary camera actions stay large and split the width. */
  .camera-controls .btn.responsive { flex: 1; padding: 16px; }

  /* Side-by-side input pairs stack vertically so they never overflow. */
  .row { flex-direction: column; gap: 0; }
}