:root {
  --green:  #2a7a4b;
  --yellow: #b8860b;
  --blue:   #1a5a8a;
  --green-bg:  #d4edda;
  --yellow-bg: #fff3cd;
  --blue-bg:   #cce5ff;
  --surface: #fff;
  --muted:   #6c757d;
  --border:  #dee2e6;
  --radius:  10px;
  --shadow:  0 2px 8px rgba(0,0,0,.08);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: system-ui, sans-serif;
  font-size: 16px;
  background: #f4f6f8;
  color: #212529;
  min-height: 100vh;
}

/* ── Header ── */
header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--green);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}
header h1 { font-size: 1.25rem; flex: 1; }

.conn-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
  transition: background .3s;
}
.conn-dot.connected    { background: #6fcf97; }
.conn-dot.disconnected { background: #eb5757; }

/* ── Buttons ── */
.btn-primary, .btn-secondary, .btn-icon, .btn-danger {
  cursor: pointer;
  border: none;
  border-radius: 6px;
  font-size: .9rem;
  padding: 8px 16px;
  transition: opacity .15s;
  min-height: 44px; /* touch target */
}
.btn-primary   { background: #fff; color: var(--green); font-weight: 600; }
.btn-secondary { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-icon      { background: transparent; color: var(--muted); padding: 8px; font-size: 1.1rem; }
.btn-danger    { background: #dc3545; color: #fff; }
.btn-primary:hover, .btn-secondary:hover, .btn-icon:hover, .btn-danger:hover { opacity: .75; }

/* ── Cat grid ── */
main {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  padding: 20px;
  max-width: 1200px;
  margin: 0 auto;
}
.empty-msg { color: var(--muted); grid-column: 1/-1; text-align: center; padding: 48px 0; }

/* ── Cat card ── */
.cat-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-left: 6px solid transparent;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: fade-in .2s ease;
}
@keyframes fade-in { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; } }

.cat-card.green  { border-color: var(--green);  background: var(--green-bg); }
.cat-card.yellow { border-color: var(--yellow); background: var(--yellow-bg); }
.cat-card.blue   { border-color: var(--blue);   background: var(--blue-bg); }

.card-header { display: flex; align-items: center; gap: 8px; }
.cat-name { font-size: 1.1rem; font-weight: 700; flex: 1; }
.card-actions { display: flex; gap: 4px; }

.chip {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 99px;
  text-transform: uppercase;
  letter-spacing: .03em;
  color: #fff;
}
.chip.green     { background: var(--green); }
.chip.yellow    { background: var(--yellow); }
.chip.blue      { background: var(--blue); }
.chip.loc-ac    { background: #6c757d; }
.chip.loc-foster { background: #9b59b6; }

.card-field { font-size: .875rem; }
.card-field strong { display: block; font-size: .75rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin-bottom: 2px; }

/* ── Modal ── */
dialog {
  border: none;
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0,0,0,.18);
  padding: 28px;
  width: min(480px, 95vw);
  max-height: 95vh;
  overflow-y: auto;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
}
dialog::backdrop { background: rgba(0,0,0,.4); }

dialog h2 { margin-bottom: 20px; }

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: 14px;
}

input[type="text"], textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  font-family: inherit;
  color: #212529;
  min-height: 44px;
  resize: vertical;
}
input[type="text"]:focus, textarea:focus { outline: 2px solid var(--green); border-color: transparent; }

.color-row { display: flex; gap: 10px; flex-wrap: wrap; }
.color-opt { flex-direction: row; align-items: center; gap: 8px; text-transform: none; letter-spacing: 0; font-size: 1rem; cursor: pointer; }
.color-opt input[type="radio"] { accent-color: var(--green); width: 18px; height: 18px; }

.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 8px; }

/* ── PIN screen ── */
.pin-screen {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
}
.pin-screen.hidden { display: none; }

.pin-box {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0,0,0,.25);
  padding: 36px 32px;
  display: flex; flex-direction: column; align-items: center; gap: 20px;
  width: min(320px, 92vw);
}
.pin-box h2 { font-size: 1.3rem; }

.pin-username {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  text-align: center;
  letter-spacing: .02em;
  min-height: 44px;
}
.pin-username:focus { outline: 2px solid var(--green); border-color: transparent; }

.pin-dots {
  display: flex; gap: 12px; min-height: 20px;
}
.pin-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--border);
  transition: background .15s;
}
.pin-dot.filled { background: var(--green); }

.pin-error { color: #eb5757; font-size: .9rem; }
.pin-error.hidden { visibility: hidden; }

.pin-pad {
  display: grid;
  grid-template-columns: repeat(3, 72px);
  gap: 10px;
}
.pin-key {
  height: 72px; width: 72px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  font-size: 1.4rem;
  cursor: pointer;
  transition: background .1s;
}
.pin-key:active { background: #e9ecef; }
.pin-clear { color: var(--muted); }
.pin-submit { background: var(--green); color: #fff; border-color: var(--green); }