:root {
  --bg: #0f1117;
  --surface: #181b24;
  --surface-2: #202430;
  --border: #2c3140;
  --text: #e8eaf0;
  --muted: #9aa1b5;
  --accent: #c4981f;
  --accent-soft: rgba(196, 152, 31, 0.15);
  --ok: #3fb56b;
  --bad: #e05252;
  --radius: 10px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--muted); font-size: 0.9rem; }
.container { max-width: 1000px; margin: 0 auto; padding: 24px 16px 80px; }

.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 24px; background: var(--surface); border-bottom: 1px solid var(--border);
}
.topbar .brand { font-weight: 700; font-size: 1.1rem; color: var(--text); }
.topbar nav { display: flex; gap: 16px; align-items: center; }
.inline { display: inline; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; margin-bottom: 16px;
}
.card h2, .card h3 { margin-top: 0; }

.btn {
  display: inline-block; padding: 8px 18px; border-radius: 8px;
  border: 1px solid var(--accent); background: var(--accent); color: #14120a;
  font-weight: 600; cursor: pointer; font-size: 0.95rem;
}
.btn:hover { filter: brightness(1.1); }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn.small { padding: 4px 12px; font-size: 0.85rem; }
.btn.danger { background: transparent; color: var(--bad); border-color: var(--bad); }

input, select, textarea {
  width: 100%; padding: 10px 12px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface-2);
  color: var(--text); font-size: 1rem; font-family: inherit;
}
input:focus, textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
label { display: block; margin: 12px 0 4px; font-size: 0.9rem; color: var(--muted); }
form.stack { max-width: 420px; }

.auth-wrap { max-width: 420px; margin: 8vh auto; }
.error {
  background: rgba(224, 82, 82, 0.12); border: 1px solid var(--bad);
  color: #f0a0a0; padding: 10px 14px; border-radius: 8px; margin-bottom: 12px;
}
.notice {
  background: var(--accent-soft); border: 1px solid var(--accent);
  padding: 10px 14px; border-radius: 8px; margin-bottom: 12px;
}

.progressbar { height: 8px; background: var(--surface-2); border-radius: 4px; overflow: hidden; }
.progressbar > div { height: 100%; background: var(--accent); }

.class-list { list-style: none; padding: 0; margin: 0; }
.class-list li {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 4px; border-bottom: 1px solid var(--border);
}
.class-list li:last-child { border-bottom: none; }
.check { color: var(--ok); }
.check.pending { color: var(--muted); }

.video-wrap { position: relative; padding-top: 56.25%; border-radius: var(--radius); overflow: hidden; background: #000; }
.video-wrap iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

.layout-class { display: block; }
.layout-main { max-width: 860px; }

/* ---- Tutor: píldora contraída ---- */
.tutor-pill {
  position: fixed; right: 24px; bottom: 24px; z-index: 90;
  display: flex; align-items: center; gap: 8px;
  padding: 10px 18px 10px 12px; border-radius: 999px;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--accent); cursor: pointer;
  font-size: 0.95rem; box-shadow: 0 6px 22px rgba(0,0,0,0.45);
  transition: transform 0.15s ease;
}
.tutor-pill:hover { transform: translateY(-2px); }
.tutor-pill.hidden { display: none; }
.tutor-avatar {
  display: grid; place-items: center; width: 30px; height: 30px;
  border-radius: 50%; background: var(--accent); font-size: 1rem; flex-shrink: 0;
}

/* ---- Tutor: panel expandido ---- */
.tutor-panel {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 95;
  width: min(430px, 100vw);
  display: none; flex-direction: column;
  background: var(--surface); border-left: 1px solid var(--border);
  box-shadow: -12px 0 40px rgba(0,0,0,0.5);
}
.tutor-panel.open { display: flex; }
.tutor-head {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 16px; border-bottom: 1px solid var(--border);
}
.tutor-close {
  margin-left: auto; background: none; border: none; color: var(--muted);
  font-size: 1.1rem; cursor: pointer; padding: 4px 8px; border-radius: 6px;
}
.tutor-close:hover { background: var(--surface-2); color: var(--text); }

.chat-messages {
  flex: 1; overflow-y: auto; padding: 16px;
  display: flex; flex-direction: column; gap: 14px;
}
.msg { padding: 12px 15px; border-radius: 14px; font-size: 0.94rem; line-height: 1.6; }
.msg.user {
  background: var(--accent-soft); border: 1px solid var(--accent);
  align-self: flex-end; max-width: 88%; border-bottom-right-radius: 4px;
}
.msg.bot {
  background: var(--surface-2); border: 1px solid var(--border);
  align-self: stretch; border-bottom-left-radius: 4px;
}
.msg.bot p { margin: 0 0 10px; }
.msg.bot p:last-child { margin-bottom: 0; }
.msg.bot ul { margin: 8px 0; padding-left: 20px; }
.msg.bot li { margin-bottom: 6px; }
.msg.bot h4 {
  margin: 14px 0 8px; font-size: 0.9rem; color: var(--accent);
  padding-top: 10px; border-top: 1px solid var(--border);
}
.msg.bot cite {
  display: block; font-style: normal; font-size: 0.78rem;
  color: var(--muted); margin-top: 2px;
}
.msg .sources { margin-top: 10px; font-size: 0.78rem; color: var(--muted); }
/* Cursor que late mientras la respuesta se va escribiendo */
.msg.streaming::after {
  content: '▋'; color: var(--accent); animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.tutor-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 8px 14px; border-radius: 999px; cursor: pointer;
  background: transparent; border: 1px solid var(--border);
  color: var(--text); font-size: 0.85rem; font-family: inherit;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }

.chat-input {
  display: flex; gap: 8px; padding: 12px 16px;
  border-top: 1px solid var(--border);
}
.chat-input input { flex: 1; border-radius: 999px; }
.chat-input .btn { border-radius: 50%; width: 42px; padding: 0; flex-shrink: 0; }

/* Quiz */
.question { margin-bottom: 20px; }
.question .opts label {
  display: flex; gap: 10px; align-items: flex-start; margin: 6px 0;
  padding: 10px 12px; background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 8px; cursor: pointer; color: var(--text);
}
.question .opts label:hover { border-color: var(--accent); }
.question .opts input { width: auto; margin-top: 4px; }
.result-ok { border-left: 4px solid var(--ok); padding-left: 12px; }
.result-bad { border-left: 4px solid var(--bad); padding-left: 12px; }
.score-big { font-size: 3rem; font-weight: 700; margin: 0; }

/* Cabecera del alumno: sin caja, la racha va en la misma línea del saludo */
.hero { margin: 8px 0 32px; }
.hero h1 { margin: 0; font-size: 2rem; letter-spacing: -0.02em; }
.hero-sub {
  margin: 6px 0 0; color: var(--muted);
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.streak { color: var(--muted); font-size: 0.85rem; white-space: nowrap; }
.streak.on { color: var(--accent); }

/* Títulos de sección, sin caja */
h2.section {
  font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.09em;
  color: var(--muted); font-weight: 600; margin: 32px 0 12px;
}

/* Logros: texto suelto, sin recuadros */
.logros { display: flex; flex-wrap: wrap; gap: 10px 26px; }
.logro {
  display: flex; align-items: center; gap: 7px;
  font-size: 0.87rem; color: var(--muted); opacity: 0.5;
}
.logro.on { color: var(--text); opacity: 1; }
.logro-icono { font-size: 1.05rem; filter: grayscale(1); }
.logro.on .logro-icono { filter: none; }

/* Barra de marcas: anticipa dónde se pausa el video para preguntar */
.cp-track {
  position: relative; height: 10px; margin-top: 8px; border-radius: 5px;
  background: var(--surface-2); border: 1px solid var(--border); overflow: visible;
}
.cp-progress {
  position: absolute; inset: 0 auto 0 0; width: 0;
  background: var(--accent); opacity: 0.35; border-radius: 5px;
}
.cp-mark {
  position: absolute; top: 50%; width: 12px; height: 12px;
  transform: translate(-50%, -50%) rotate(45deg);
  background: var(--accent); border: 1px solid var(--bg);
  border-radius: 2px; cursor: pointer;
}
.cp-mark:hover { filter: brightness(1.3); }
.cp-mark.done { background: var(--ok); }

/* Quiz embebido en el video */
.quiz-overlay {
  display: none; position: fixed; inset: 0; z-index: 100;
  background: rgba(10, 12, 18, 0.85); backdrop-filter: blur(4px);
  align-items: center; justify-content: center; padding: 20px;
}
.quiz-overlay.open { display: flex; }
.quiz-modal {
  background: var(--surface); border: 1px solid var(--accent);
  border-radius: var(--radius); padding: 24px; max-width: 640px;
  width: 100%; max-height: 85vh; overflow-y: auto;
}

/* Refuerzo inmediato dentro de la pausa */
#refuerzo {
  margin: 18px 0; padding: 16px;
  border-radius: var(--radius); background: var(--surface-2);
  border: 1px solid var(--border); border-left: 3px solid var(--accent);
}
.refuerzo-head { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.refuerzo-texto { font-size: 0.93rem; line-height: 1.6; }
.refuerzo-consigna {
  margin: 14px 0 8px; font-weight: 600; color: var(--accent); font-size: 0.93rem;
}
#refuerzo textarea { font-size: 0.92rem; }
.refuerzo-devolucion {
  margin-top: 12px; padding: 10px 14px; border-radius: 8px;
  font-size: 0.9rem; line-height: 1.55;
}
.refuerzo-devolucion.ok { background: rgba(63, 181, 107, 0.12); border: 1px solid var(--ok); }
.refuerzo-devolucion.mejorable { background: var(--accent-soft); border: 1px solid var(--accent); }

/* Miniaturas de clases */
.class-list li img.thumb {
  width: 96px; aspect-ratio: 16/9; object-fit: cover;
  border-radius: 6px; flex-shrink: 0; background: #000;
}

/* Tablas admin */
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 800px) { .grid-2 { grid-template-columns: 1fr; } }
.pill {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: 0.78rem; background: var(--surface-2); border: 1px solid var(--border);
}
.pill.on { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
details.qedit { margin: 8px 0; border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; }
details.qedit summary { cursor: pointer; }
code { background: var(--surface-2); padding: 1px 6px; border-radius: 4px; font-size: 0.85em; }