:root {
  --bg: #0a0a0f;
  --bg-card: #13131a;
  --bg-input: #1a1a24;
  --led: #39FF14;
  --led-dim: #2ad406;
  --led-soft: rgba(57,255,20,0.15);
  --led-glow: 0 0 12px rgba(57,255,20,0.6), 0 0 28px rgba(57,255,20,0.35), 0 0 48px rgba(57,255,20,0.18);
  --led-glow-soft: 0 0 8px rgba(57,255,20,0.4), 0 0 16px rgba(57,255,20,0.2);
  --border: rgba(57,255,20,0.25);
  --text: #e8edf5;
  --text-soft: #8a8d9a;
  --error: #ff4c4c;
  --warning: #ffae00;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

html, body {
  background: var(--bg);
  min-height: 100vh;
  min-height: 100dvh;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, sans-serif;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body { position: relative; }

/* Glow de fondo */
.bg-glow {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(circle at 50% 0%, rgba(57,255,20,0.08), transparent 60%),
    radial-gradient(circle at 50% 100%, rgba(57,255,20,0.06), transparent 50%);
}

/* Pantallas */
.screen {
  position: fixed; inset: 0;
  display: none; flex-direction: column;
  padding: 40px 24px 24px;
  max-width: 480px; margin: 0 auto;
  z-index: 1;
  animation: fadeIn 0.4s ease-out;
}
.screen[data-active="true"] { display: flex; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* Logo */
.logo-big {
  text-align: center;
  margin-top: 12vh;
  margin-bottom: 50px;
}
.logo-text {
  font-size: 42px; font-weight: 800;
  letter-spacing: 2px;
  color: var(--led);
  text-shadow: var(--led-glow);
  animation: pulse 3s ease-in-out infinite;
}
.logo-sub {
  color: var(--text-soft);
  font-size: 12px; letter-spacing: 3px;
  margin-top: 10px;
  text-transform: uppercase;
}
@keyframes pulse {
  0%,100% { filter: brightness(1); }
  50% { filter: brightness(1.2); }
}

/* Welcome */
.welcome-wrap { display: flex; flex-direction: column; height: 100%; }
.welcome-text {
  text-align: center;
  color: var(--text-soft);
  font-size: 15px; line-height: 1.6;
  margin-bottom: auto;
}
.welcome-footer {
  text-align: center;
  color: var(--text-soft);
  font-size: 11px;
  margin-top: 20px;
}

/* Login wrap */
.login-wrap { display: flex; flex-direction: column; gap: 16px; padding-top: 40px; }
.login-wrap h2 {
  font-size: 22px; font-weight: 600;
  margin-top: 30px;
}
.login-wrap .muted {
  color: var(--text-soft); font-size: 14px; line-height: 1.5;
}
.login-wrap .muted-small {
  color: var(--text-soft); font-size: 11px;
  text-align: center; margin-top: 20px;
  line-height: 1.5;
}

.btn-back {
  position: absolute; top: 16px; left: 16px;
  background: transparent; border: none;
  color: var(--text); font-size: 28px; cursor: pointer;
  width: 40px; height: 40px;
  border-radius: 50%;
}
.btn-back:active { background: var(--bg-card); }

/* Input teléfono */
.input-tel {
  display: flex; align-items: center;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0 14px;
  margin-top: 8px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.input-tel:focus-within {
  border-color: var(--led);
  box-shadow: var(--led-glow-soft);
}
.input-tel .prefix {
  color: var(--text-soft);
  font-size: 16px;
  padding-right: 10px;
  border-right: 1px solid var(--border);
}
.input-tel input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 18px;
  padding: 18px 14px;
  outline: none;
  font-weight: 500;
}

/* Input código (4 dígitos) */
.input-codigo {
  display: flex; gap: 12px;
  justify-content: center;
  margin: 24px 0;
}
.cdigit {
  width: 60px; height: 70px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--led);
  font-size: 32px; font-weight: 700;
  text-align: center;
  outline: none;
  text-shadow: var(--led-glow-soft);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.cdigit:focus {
  border-color: var(--led);
  box-shadow: var(--led-glow);
}

/* Input nombre */
#nombre-input {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 18px;
  color: var(--text);
  font-size: 18px;
  outline: none;
  width: 100%;
  margin-top: 8px;
}
#nombre-input:focus {
  border-color: var(--led);
  box-shadow: var(--led-glow-soft);
}

/* Botones */
.btn-led {
  background: var(--led);
  color: var(--bg);
  border: none;
  padding: 18px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  margin-top: 12px;
  box-shadow: var(--led-glow);
  transition: transform 0.1s, filter 0.2s;
}
.btn-led:active {
  transform: scale(0.98);
  filter: brightness(0.9);
}
.btn-led:disabled {
  background: var(--bg-card);
  color: var(--text-soft);
  box-shadow: none;
  cursor: wait;
}

.btn-link {
  background: transparent;
  border: none;
  color: var(--led);
  text-shadow: var(--led-glow-soft);
  font-size: 14px;
  padding: 10px;
  cursor: pointer;
}

/* Error box */
.error-box {
  color: var(--error);
  font-size: 13px;
  min-height: 18px;
  text-align: center;
  font-weight: 500;
}

/* ════════ CHAT ════════ */
.chat-screen {
  padding: 0;
  max-width: 100%;
  height: 100vh; height: 100dvh;
}

.chat-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px 14px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
.chat-title-main {
  font-size: 17px; font-weight: 700;
  letter-spacing: 1px;
  color: var(--led);
  text-shadow: var(--led-glow-soft);
}
.chat-title-sub {
  font-size: 11px;
  color: var(--text-soft);
  margin-top: 2px;
  display: flex; align-items: center; gap: 6px;
}
.led-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--led);
  box-shadow: var(--led-glow-soft);
  animation: blink 1.5s ease-in-out infinite;
}
.led-dot.small { width: 7px; height: 7px; }
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-soft);
  font-size: 22px;
  cursor: pointer;
  width: 40px; height: 40px;
  border-radius: 50%;
}
.btn-icon:active { background: var(--bg-input); color: var(--led); }

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px 16px;
  display: flex; flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
}

/* Mensajes */
.msg {
  max-width: 80%;
  padding: 10px 14px;
  border-radius: 16px;
  font-size: 14px; line-height: 1.45;
  word-wrap: break-word;
  animation: msgIn 0.3s ease-out;
}
@keyframes msgIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }

.msg.bot {
  align-self: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-top-left-radius: 4px;
}
.msg.cliente {
  align-self: flex-end;
  background: var(--led-soft);
  border: 1px solid var(--border);
  color: var(--text);
  border-top-right-radius: 4px;
}
.msg.operador {
  align-self: flex-start;
  background: var(--bg-card);
  border: 1px solid rgba(57,255,20,0.4);
  border-top-left-radius: 4px;
  box-shadow: var(--led-glow-soft);
}
.msg.operador::before {
  content: "Operador";
  display: block;
  font-size: 10px;
  color: var(--led);
  margin-bottom: 4px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.msg.sistema {
  align-self: center;
  background: transparent;
  color: var(--text-soft);
  font-size: 12px;
  font-style: italic;
  text-align: center;
}

.msg-time {
  font-size: 10px;
  color: var(--text-soft);
  margin-top: 4px;
}

/* Opciones del bot */
.opciones {
  display: flex; flex-direction: column;
  gap: 8px; margin-top: 10px;
}
.opcion-btn {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.opcion-btn:active {
  background: var(--led-soft);
  border-color: var(--led);
}

/* Chat footer (input) */
.chat-footer {
  display: flex; gap: 10px;
  padding: 12px 16px;
  padding-bottom: max(12px, env(safe-area-inset-bottom));
  background: var(--bg-card);
  border-top: 1px solid var(--border);
}
#msg-input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 12px 18px;
  color: var(--text);
  font-size: 15px;
  outline: none;
}
#msg-input:focus {
  border-color: var(--led);
  box-shadow: var(--led-glow-soft);
}
.btn-send {
  background: var(--led);
  color: var(--bg);
  border: none;
  width: 44px; height: 44px;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  box-shadow: var(--led-glow-soft);
  display: flex; align-items: center; justify-content: center;
}
.btn-send:active { transform: scale(0.94); }
.btn-send:disabled {
  background: var(--bg-input);
  color: var(--text-soft);
  box-shadow: none;
}

/* Loader */
.loader {
  display: inline-block;
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: var(--bg);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: middle;
  margin-right: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }