:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1f232c;
  --border: #2a2f3a;
  --text: #e7e9ee;
  --muted: #8b93a3;
  --accent: #4f8cff;
  --accent-2: #3a6fd8;
  --ok: #34d399;
  --warn: #fbbf24;
  --err: #f87171;
  --radius: 12px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

.muted { color: var(--muted); }
.small { font-size: 12px; }
.ok { color: var(--ok); }
.spacer { flex: 1; }

/* ---------- Login ---------- */
.centered { display: flex; align-items: center; justify-content: center; padding: 24px; }
.login { width: 100%; max-width: 360px; }
.login h1 { margin: 0 0 4px; letter-spacing: .5px; }
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.login label { display: block; margin: 14px 0 6px; font-size: 13px; color: var(--muted); }
input[type=email], input[type=password], input[type=text] {
  width: 100%;
  padding: 11px 12px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 9px;
  color: var(--text);
  font-size: 14px;
  outline: none;
}
input:focus { border-color: var(--accent); }
button {
  cursor: pointer;
  border: none;
  border-radius: 9px;
  padding: 11px 16px;
  background: var(--accent);
  color: white;
  font-size: 14px;
  font-weight: 600;
  transition: background .15s;
}
button:hover { background: var(--accent-2); }
.login button { width: 100%; margin-top: 18px; }
button.ghost { background: transparent; border: 1px solid var(--border); color: var(--muted); font-weight: 500; }
button.ghost:hover { background: var(--panel-2); color: var(--text); }
button.tiny { padding: 2px 8px; font-size: 16px; line-height: 1; }

.alert { padding: 10px 12px; border-radius: 9px; font-size: 13px; margin-top: 12px; }
.alert.warn { background: rgba(251,191,36,.12); color: var(--warn); }
.alert.err  { background: rgba(248,113,113,.12); color: var(--err); }

/* ---------- Topbar ---------- */
.topbar {
  display: flex; align-items: center; gap: 14px;
  padding: 10px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; letter-spacing: .5px; }
.tag { font-size: 11px; background: var(--accent); color: #fff; padding: 2px 7px; border-radius: 6px; vertical-align: middle; }
.topbar form { margin: 0; }

/* ---------- Viewer ---------- */
.viewer { display: flex; flex-direction: column; height: 100vh; }
.stage { flex: 1; display: flex; align-items: center; justify-content: center; padding: 18px; }
.video-wrap {
  position: relative;
  width: 100%;
  max-width: 1100px;
  aspect-ratio: 16 / 9;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}
.video-wrap iframe, .video-wrap #player { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* Reproductor blindado: capa que bloquea clics hacia YouTube */
.block-overlay { position: absolute; inset: 0; z-index: 2; cursor: pointer; background: transparent; }
.controls {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 3;
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  background: linear-gradient(transparent, rgba(0,0,0,.65));
  opacity: 0; transition: opacity .2s;
}
.video-wrap:hover .controls { opacity: 1; }
.controls button {
  background: rgba(255,255,255,.14); border: none; color: #fff;
  min-width: 38px; height: 34px; border-radius: 7px; font-size: 14px; cursor: pointer;
}
.controls button:hover { background: rgba(255,255,255,.26); }
.controls .spacer { flex: 1; }
.live-badge { color: var(--err); font-weight: 700; font-size: 12px; letter-spacing: .5px; }
.start-gate {
  position: absolute; inset: 0; z-index: 4;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,.6);
}
.start-gate button {
  background: var(--accent); color: #fff; border: none;
  padding: 15px 24px; border-radius: 10px; font-size: 16px; font-weight: 600; cursor: pointer;
}
.start-gate button:hover { background: var(--accent-2); }

/* Pantalla completa: que el contenedor llene toda la pantalla */
.video-wrap:fullscreen,
.video-wrap:-webkit-full-screen {
  max-width: none; width: 100vw; height: 100vh;
  aspect-ratio: auto; border-radius: 0; border: 0;
}

/* Pantalla completa simulada (movil/iOS) */
.video-wrap.pseudo-fs {
  position: fixed; inset: 0; z-index: 9999;
  max-width: none; width: 100vw; height: 100vh;
  aspect-ratio: auto; border-radius: 0; border: 0; background: #000;
}
body.fs-lock { overflow: hidden; }
.video-wrap.pseudo-fs .controls { opacity: 1; }

/* Si el celular esta en vertical, rotar el video a horizontal */
@media (orientation: portrait) {
  .video-wrap.pseudo-fs {
    inset: auto;
    top: 0; left: 100vw;
    width: 100vh; height: 100vw;
    transform: rotate(90deg);
    transform-origin: top left;
  }
}

/* Chat del alumno (vista viewer) */
.viewer .stage { flex-direction: column; gap: 16px; }
.viewer-chat { width: 100%; max-width: 1100px; }
.viewer-chat .chat-log { height: 220px; }

/* Mensajes de alumno en el panel admin */
.msg.from-student { background: rgba(79,140,255,.10); border-left: 2px solid var(--accent); padding: 4px 8px; border-radius: 6px; }
.msg.from-student .who { color: var(--warn); }

/* Selector "Para:" del chat admin */
.chat-target { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.chat-target select {
  flex: 1; padding: 8px 10px; background: var(--panel-2);
  border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 13px;
}

.waiting { text-align: center; color: var(--muted); }
.waiting h2 { color: var(--text); margin: 8px 0; }
.small-box { padding: 40px 16px; }
.pulse {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); margin: 0 auto 18px;
  box-shadow: 0 0 0 0 rgba(79,140,255,.6);
  animation: pulse 1.8s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(79,140,255,.6); }
  70%  { box-shadow: 0 0 0 16px rgba(79,140,255,0); }
  100% { box-shadow: 0 0 0 0 rgba(79,140,255,0); }
}

/* ---------- Admin ---------- */
.admin-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 16px;
  padding: 16px;
  align-items: start;
}
.col-main { display: flex; flex-direction: column; gap: 16px; }
.col-side { display: flex; flex-direction: column; gap: 16px; }
.row { display: flex; gap: 8px; }
.row input { flex: 1; }
.card h3 { margin: 0 0 12px; font-size: 15px; }
.card label { display: block; margin-bottom: 6px; font-size: 13px; color: var(--muted); }

/* Chat */
.chat-card { display: flex; flex-direction: column; }
.chat-log {
  height: 320px; overflow-y: auto;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 10px;
  margin-bottom: 10px;
  display: flex; flex-direction: column; gap: 8px;
}
.msg { font-size: 13px; line-height: 1.35; }
.msg .who { font-weight: 700; color: var(--accent); }
.msg.mine .who { color: var(--ok); }
.msg .time { color: var(--muted); font-size: 11px; margin-left: 6px; }
.msg .body { color: var(--text); word-wrap: break-word; }
#chatStatus { margin-top: 8px; }

/* Lista de alumnos */
.student-list { list-style: none; margin: 12px 0 0; padding: 0; max-height: 240px; overflow-y: auto; }
.student-list li { display: flex; align-items: center; gap: 8px; padding: 6px 0; border-bottom: 1px solid var(--border); font-size: 13px; }
.student-list .email { flex: 1; word-break: break-all; }
.student-list .inline { margin: 0; }
.dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.dot.on { background: var(--ok); box-shadow: 0 0 6px var(--ok); }
.dot.off { background: #4b5563; }

@media (max-width: 880px) {
  .admin-grid { grid-template-columns: 1fr; }
}