/* ====== Reset & Base ====== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #0a0a0a;
  color: #e0e0e0;
  -webkit-user-select: none;
  user-select: none;
}

/* ====== Screens ====== */
.screen { display: none; height: 100vh; flex-direction: column; }
.screen.active { display: flex; }

/* ====== Intro Screen ====== */
#intro-screen {
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  background: linear-gradient(180deg, #0a1a0a 0%, #0a0a0a 100%);
}
.intro-content { max-width: 360px; }
.logo {
  position: relative;
  width: 80px; height: 80px;
  margin: 0 auto 1.5rem;
}
.logo-signal {
  position: absolute;
  top: 50%; left: 50%;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #00ff88;
  transform: translate(-50%, -50%);
  animation: pulse-signal 2s ease-out infinite;
}
.logo-signal.delay1 { animation-delay: 0.4s; }
.logo-signal.delay2 { animation-delay: 0.8s; }
@keyframes pulse-signal {
  0% { width: 20px; height: 20px; opacity: 1; }
  100% { width: 80px; height: 80px; opacity: 0; }
}
h1 { font-size: 2rem; color: #00ff88; margin-bottom: 0.3rem; letter-spacing: 2px; }
.subtitle { font-size: 0.85rem; color: #666; margin-bottom: 1.2rem; }
.desc { font-size: 0.8rem; color: #888; line-height: 1.5; margin-bottom: 2rem; }
.btn-primary {
  background: #00ff88;
  color: #000;
  border: none;
  padding: 0.8rem 2.5rem;
  border-radius: 2rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-primary:hover { background: #00cc6a; }
.btn-primary:active { transform: scale(0.96); }
.btn-primary:disabled { background: #333; color: #666; cursor: not-allowed; }
.features {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  justify-content: center;
  flex-wrap: wrap;
}
.feature {
  font-size: 0.7rem;
  color: #888;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.feature .icon { font-size: 1rem; }

/* ====== Main Screen ====== */
#main-screen { background: #0a0a0a; overflow: hidden; }

/* Camera Panel */
#camera-panel {
  position: relative;
  height: 25vh;
  min-height: 140px;
  background: #111;
  overflow: hidden;
  border-bottom: 1px solid #222;
}
#camera-video {
  width: 100%; height: 100%;
  object-fit: cover;
  transform: scaleX(-1);
}
#analysis-canvas { display: none; }
#brightness-indicator {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 4px;
  background: #222;
}
#brightness-fill {
  height: 100%;
  width: 0%;
  background: #00ff88;
  transition: width 0.05s;
}
#camera-label {
  position: absolute;
  top: 8px; left: 8px;
  font-size: 0.65rem;
  color: #00ff88;
  background: rgba(0,0,0,0.6);
  padding: 2px 8px;
  border-radius: 4px;
}
#signal-dot {
  position: absolute;
  top: 8px; right: 8px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: #333;
  transition: background 0.1s;
}
#signal-dot.active { background: #00ff88; box-shadow: 0 0 8px #00ff88; }

/* Status Bar */
#status-bar {
  display: flex;
  align-items: center;
  padding: 0.4rem 0.8rem;
  background: #111;
  border-bottom: 1px solid #1a1a1a;
  gap: 0.5rem;
  font-size: 0.75rem;
}
.status-disconnected { color: #ff4444; }
.status-connecting { color: #ffaa00; animation: blink 1s infinite; }
.status-connected { color: #00ff88; }
@keyframes blink { 50% { opacity: 0.4; } }
#mode-label { color: #666; flex: 1; text-align: right; }
.btn-icon {
  background: none; border: none; color: #666;
  font-size: 1.1rem; cursor: pointer; padding: 0.2rem;
}

/* Messages */
#messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.system-msg {
  text-align: center;
  font-size: 0.7rem;
  color: #555;
  padding: 0.4rem;
}
.msg {
  max-width: 80%;
  padding: 0.5rem 0.8rem;
  border-radius: 1rem;
  font-size: 0.85rem;
  word-break: break-word;
}
.msg-sent {
  align-self: flex-end;
  background: #00ff88;
  color: #000;
  border-bottom-right-radius: 0.3rem;
}
.msg-received {
  align-self: flex-start;
  background: #1a1a2e;
  color: #e0e0e0;
  border-bottom-left-radius: 0.3rem;
}
.msg-time {
  font-size: 0.55rem;
  color: #999;
  margin-top: 0.2rem;
}
.msg-sent .msg-time { color: #006633; }

/* Quick Actions */
#quick-actions {
  display: flex;
  gap: 0.4rem;
  padding: 0.5rem 0.8rem;
  overflow-x: auto;
  background: #0d0d0d;
  border-top: 1px solid #1a1a1a;
}
.quick-btn {
  flex-shrink: 0;
  padding: 0.35rem 0.8rem;
  border-radius: 1rem;
  border: 1px solid #333;
  background: #1a1a1a;
  color: #ccc;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.15s;
}
.quick-btn:active { background: #333; }
.quick-btn.sos-btn {
  border-color: #ff4444;
  color: #ff4444;
  font-weight: 700;
}
.quick-btn.sos-btn:active { background: #331111; }

/* Fight Mode Button */
.quick-btn.fight-btn {
  border-color: #ff8800;
  color: #ff8800;
  font-weight: 700;
}
.quick-btn.fight-btn:active { background: #332200; }
.quick-btn.fight-btn.fight-active {
  background: #ff8800;
  color: #000;
  animation: fight-pulse 0.8s infinite;
}
@keyframes fight-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255,136,0,0.4); }
  50% { box-shadow: 0 0 12px 4px rgba(255,136,0,0.6); }
}

/* Fight mode messages */
.msg-fight.msg-sent {
  background: #ff6600;
  animation: msg-shake 0.3s ease-out;
}
.msg-fight.msg-received {
  background: #2a1a0a;
  border: 1px solid #ff4444;
  animation: msg-shake 0.3s ease-out;
}
@keyframes msg-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

/* Input Area */
#input-area {
  display: flex;
  gap: 0.5rem;
  padding: 0.5rem 0.8rem;
  background: #0d0d0d;
}
#msg-input {
  flex: 1;
  padding: 0.5rem 0.8rem;
  border-radius: 1.5rem;
  border: 1px solid #333;
  background: #1a1a1a;
  color: #e0e0e0;
  font-size: 0.85rem;
  outline: none;
}
#msg-input:focus { border-color: #00ff88; }
#input-area .btn-primary {
  padding: 0.5rem 1.2rem;
  font-size: 0.85rem;
}

/* Signal Area */
#signal-area {
  position: relative;
  height: 22vh;
  min-height: 100px;
  background: #000;
  border-top: 1px solid #1a1a1a;
}
#signal-display {
  width: 100%; height: 100%;
  background: #000;
  transition: background-color 0.02s;
}
#signal-display.on-green { background: #00ff88; }
#signal-display.on-white { background: #ffffff; }
#signal-display.on-cyan { background: #00ffff; }
#signal-display.on-red { background: #ff0000; }
#signal-status {
  position: absolute;
  bottom: 8px; left: 50%;
  transform: translateX(-50%);
  font-size: 0.6rem;
  color: #444;
  pointer-events: none;
}
#sending-progress {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: #111;
  display: none;
}
#sending-progress.active { display: block; }
#progress-fill {
  height: 100%;
  width: 0%;
  background: #00ff88;
  transition: width 0.1s;
}
#progress-text {
  position: absolute;
  top: 8px; left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: #00ff88;
  white-space: nowrap;
}

/* ====== Settings Modal ====== */
.modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
}
.modal[hidden] { display: none; }
.modal-content {
  background: #1a1a1a;
  border-radius: 1rem;
  padding: 1.5rem;
  width: 90%;
  max-width: 320px;
}
.modal-content h3 { margin-bottom: 1rem; color: #00ff88; }
.modal-content label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 1rem;
  font-size: 0.8rem;
  color: #999;
}
.modal-content select, .modal-content input[type="range"] {
  width: 100%;
  padding: 0.4rem;
  background: #222;
  color: #e0e0e0;
  border: 1px solid #333;
  border-radius: 0.5rem;
  font-size: 0.85rem;
}
.modal-actions { text-align: center; margin-top: 1rem; }

/* ====== Animations ====== */
@keyframes flash-sos {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}
.sending-active #signal-status { color: #00ff88; animation: flash-sos 0.5s infinite; }

/* ====== Torch Toggle ====== */
#torch-label-wrap {
  flex-direction: row !important;
  align-items: center;
  justify-content: space-between;
}
#torch-toggle {
  width: auto;
  accent-color: #00ff88;
}

/* ====== Scrollbar ====== */
#messages::-webkit-scrollbar { width: 3px; }
#messages::-webkit-scrollbar-thumb { background: #333; border-radius: 2px; }