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

:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --border: #1e1e2e;
  --text: #c8c8d4;
  --text-dim: #6a6a7a;
  --amber: #f0a830;
  --amber-glow: #f0a83066;
  --amber-dim: #3a2a10;
  --on: #f0a830;
  --off: #2a2a3a;
  --danger: #c0392b;
}

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

/* --- Landing Page --- */
.landing {
  display: flex;
  align-items: center;
  justify-content: center;
}

.landing-container {
  text-align: center;
  max-width: 360px;
  width: 100%;
  padding: 20px;
}

.logo-glow {
  margin-bottom: 48px;
}

.logo {
  font-size: 3.2rem;
  font-weight: 300;
  letter-spacing: 0.15em;
  color: var(--amber);
  text-shadow: 0 0 40px var(--amber-glow), 0 0 80px var(--amber-glow);
}

.tagline {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-top: 8px;
  font-style: italic;
}

.auth-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

.auth-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  background: var(--bg);
  border-radius: 8px;
  padding: 4px;
}

.tab {
  flex: 1;
  padding: 8px;
  border: none;
  background: none;
  color: var(--text-dim);
  font-size: 0.9rem;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s;
}

.tab.active {
  background: var(--border);
  color: var(--text);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.auth-form.hidden { display: none; }

.auth-form input {
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

.auth-form input:focus {
  border-color: var(--amber);
}

.auth-form button, .btn {
  padding: 12px;
  background: var(--amber);
  color: var(--bg);
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}

.auth-form button:hover, .btn:hover { opacity: 0.85; }

.error-msg {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 12px;
  min-height: 20px;
  opacity: 0;
  transition: opacity 0.3s;
}

.error-msg.visible { opacity: 1; }

/* --- App Page --- */
.app-container {
  max-width: 480px;
  margin: 0 auto;
  padding: 24px 20px;
  min-height: 100vh;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.app-logo {
  font-size: 1.3rem;
  font-weight: 300;
  letter-spacing: 0.12em;
  color: var(--amber);
  text-shadow: 0 0 20px var(--amber-glow);
}

.logout-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 6px;
  transition: color 0.2s;
}

.logout-btn:hover { color: var(--text); }

/* Your Light */
.your-light {
  text-align: center;
  padding: 32px 0;
  margin-bottom: 32px;
}

.switch-track {
  width: 80px;
  height: 44px;
  border-radius: 22px;
  background: var(--off);
  border: 2px solid var(--border);
  cursor: pointer;
  position: relative;
  margin: 0 auto 16px;
  transition: all 0.3s;
}

.switch-track.on {
  background: var(--amber-dim);
  border-color: var(--amber);
  box-shadow: 0 0 20px var(--amber-glow), 0 0 40px var(--amber-glow);
}

.switch-knob {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--text-dim);
  position: absolute;
  top: 2px;
  left: 2px;
  transition: all 0.3s;
}

.switch-track.on .switch-knob {
  left: 38px;
  background: var(--amber);
  box-shadow: 0 0 12px var(--amber);
}

.your-name {
  font-size: 1.1rem;
  color: var(--text);
}

.your-status {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 4px;
}

/* Circle Section */
.circles-section {
  margin-bottom: 32px;
}

.section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.circle-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}

.circle-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.circle-name {
  font-size: 1rem;
  font-weight: 500;
}

.circle-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.circle-code {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: monospace;
  background: var(--bg);
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: color 0.2s;
}

.circle-code:hover { color: var(--amber); }

.circle-leave {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 4px;
  transition: color 0.2s;
}

.circle-leave:hover { color: var(--danger); }

/* Lights Grid */
.lights-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.light-orb {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 72px;
}

.orb {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--off);
  border: 2px solid var(--border);
  transition: all 0.4s;
}

.orb.on {
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 0 16px var(--amber-glow), 0 0 32px var(--amber-glow);
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 16px var(--amber-glow), 0 0 32px var(--amber-glow); }
  50% { box-shadow: 0 0 24px var(--amber-glow), 0 0 48px var(--amber-glow); }
}

.light-name {
  font-size: 0.75rem;
  color: var(--text);
  text-align: center;
  line-height: 1.2;
  word-break: break-word;
}

.light-time {
  font-size: 0.65rem;
  color: var(--text-dim);
  text-align: center;
}

/* Empty state */
.empty-state {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  padding: 16px 0;
}

/* Circle Management */
.circle-mgmt {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.mgmt-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.mgmt-row:last-child { margin-bottom: 0; }

.mgmt-row input {
  flex: 1;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
}

.mgmt-row input:focus { border-color: var(--amber); }

.mgmt-row button {
  padding: 10px 16px;
  background: var(--border);
  color: var(--text);
  border: none;
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
}

.mgmt-row button:hover { background: var(--amber-dim); }

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 0.85rem;
  transition: transform 0.3s;
  z-index: 100;
}

.toast.visible { transform: translateX(-50%) translateY(0); }

/* Responsive */
@media (max-width: 400px) {
  .light-orb { width: 60px; }
  .orb { width: 40px; height: 40px; }
  .switch-track { width: 70px; height: 38px; }
  .switch-knob { width: 30px; height: 30px; }
  .switch-track.on .switch-knob { left: 34px; }
}