* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Segoe UI', sans-serif; background: #0a0a0a; color: #f0f0f0; min-height: 100vh; }

.pantalla { display: none; }
.pantalla.activa, .pantalla:not(.oculto) { display: block; }
.oculto { display: none !important; }

/* Auth */
.card { max-width: 400px; margin: 80px auto; background: #1a1a2e; padding: 2rem; border-radius: 16px; }
h1 { font-size: 2rem; text-align: center; margin-bottom: 0.25rem; }
.subtitle { text-align: center; color: #888; margin-bottom: 1.5rem; }
.tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
.tab { flex: 1; padding: 0.5rem; background: #222; border: none; color: #aaa; border-radius: 8px; cursor: pointer; }
.tab.activo { background: #16c784; color: #000; font-weight: bold; }
input, select, textarea { width: 100%; padding: 0.75rem; margin-bottom: 0.75rem; background: #111; border: 1px solid #333; border-radius: 8px; color: #fff; font-size: 1rem; }
button[type="submit"], #btn-enviar { width: 100%; padding: 0.75rem; background: #16c784; border: none; border-radius: 8px; color: #000; font-weight: bold; font-size: 1rem; cursor: pointer; }
.mensaje { margin-top: 1rem; text-align: center; color: #f39c12; font-size: 0.9rem; }

/* Coach */
header { display: flex; justify-content: space-between; align-items: center; padding: 1rem 2rem; background: #111; border-bottom: 1px solid #222; }
header button { background: #e74c3c; border: none; padding: 0.5rem 1rem; border-radius: 8px; color: #fff; cursor: pointer; }

.coach-container { max-width: 800px; margin: 2rem auto; padding: 0 1rem; }
.modos { display: flex; gap: 0.5rem; margin-bottom: 1rem; flex-wrap: wrap; }
.modo-btn { padding: 0.5rem 1rem; background: #1a1a2e; border: 1px solid #333; border-radius: 8px; color: #aaa; cursor: pointer; }
.modo-btn.activo { background: #16c784; color: #000; border-color: #16c784; font-weight: bold; }

#chat { background: #111; border-radius: 12px; padding: 1rem; }
#mensajes { min-height: 300px; max-height: 400px; overflow-y: auto; margin-bottom: 1rem; display: flex; flex-direction: column; gap: 0.75rem; }
.msg-user { align-self: flex-end; background: #16c784; color: #000; padding: 0.5rem 1rem; border-radius: 12px; max-width: 70%; }
.msg-coach { align-self: flex-start; background: #1a1a2e; padding: 0.5rem 1rem; border-radius: 12px; max-width: 80%; white-space: pre-wrap; }
.input-area { display: flex; gap: 0.5rem; }
.input-area textarea { flex: 1; height: 60px; resize: none; margin: 0; }
.input-area button { width: auto; padding: 0 1.5rem; }

#panel-errores { margin-top: 1.5rem; background: #1a1a2e; border-radius: 12px; padding: 1rem; }
#lista-errores { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
#lista-errores li { display: flex; justify-content: space-between; padding: 0.5rem; background: #111; border-radius: 8px; }
.badge { background: #e74c3c; color: #fff; padding: 0.1rem 0.5rem; border-radius: 20px; font-size: 0.8rem; }