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

:root {
  --bg:       #0f1117;
  --surface:  #1a1d27;
  --border:   #2a2d3e;
  --accent:   #f59e0b;
  --text:     #e5e7eb;
  --muted:    #6b7280;
  --success:  #22c55e;
  --danger:   #ef4444;
  --radius:   12px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
}

/* ── Utilities ──────────────────────────────────── */
.hidden { display: none !important; }
.error  { color: var(--danger); font-size: 0.875rem; margin-top: 0.5rem; }

/* ── Login ──────────────────────────────────────── */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 380px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
}

.login-card .logo { font-size: 1.8rem; font-weight: 700; color: var(--accent); margin-bottom: 0.25rem; }
.login-card p     { color: var(--muted); margin-bottom: 1.5rem; }

#login-form { display: flex; flex-direction: column; gap: 0.75rem; }
#login-form input {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
  padding: 0.75rem 1rem;
  outline: none;
  transition: border-color .2s;
}
#login-form input:focus { border-color: var(--accent); }

/* ── Buttons ────────────────────────────────────── */
.btn {
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.65rem 1.4rem;
  transition: opacity .15s, transform .1s;
  white-space: nowrap;
}
.btn:hover  { opacity: .88; }
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .4; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--accent);  color: #000; }
.btn-success { background: var(--success); color: #000; }
.btn-danger  { background: var(--danger);  color: #fff; }
.btn-warning { background: #f59e0b; color: #000; }
.btn-ghost   { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-sm      { font-size: 0.8rem; padding: 0.4rem 0.9rem; }

/* ── Header ─────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
header .logo  { font-size: 1.3rem; font-weight: 700; color: var(--accent); flex: 1; }

/* ── Status badge ───────────────────────────────── */
.badge {
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: .04em;
  padding: 0.3rem 0.85rem;
  text-transform: uppercase;
}
.badge-off          { background: #27272a; color: var(--muted); }
.badge-initializing { background: #713f12; color: #fcd34d; }
.badge-waiting_qr   { background: #1e3a5f; color: #60a5fa; }
.badge-authenticated { background: #14532d; color: #86efac; }
.badge-ready        { background: #14532d; color: #4ade80; }
.badge-disconnected { background: #450a0a; color: #fca5a5; }
.badge-auth_failure { background: #450a0a; color: #f87171; }
.badge-stopped      { background: #27272a; color: var(--muted); }

/* ── Main layout ────────────────────────────────── */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Card ───────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.card h2    { font-size: 1.05rem; font-weight: 700; margin-bottom: 1rem; color: var(--accent); }
.hint       { color: var(--muted); font-size: 0.875rem; margin-bottom: 1rem; }

/* ── Controls ───────────────────────────────────── */
.controls-row { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.control-msg  { margin-top: 0.75rem; font-size: 0.875rem; color: var(--muted); min-height: 1.25rem; }

/* ── QR Code ────────────────────────────────────── */
#qr-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 1rem;
}

/* ── Instructions ───────────────────────────────── */
#instructions-area {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: 'Courier New', monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  padding: 0.85rem 1rem;
  resize: vertical;
  outline: none;
  transition: border-color .2s;
}
#instructions-area:focus { border-color: var(--accent); }

.save-row { display: flex; align-items: center; gap: 1rem; margin-top: 0.75rem; flex-wrap: wrap; }
.save-msg { font-size: 0.875rem; color: var(--success); }

/* ── Responsive ─────────────────────────────────── */
@media (max-width: 480px) {
  header .logo { font-size: 1rem; }
  .controls-row { flex-direction: column; }
  .btn { width: 100%; }
}