:root {
    --bg-dark: #02040a;      /* Fondo casi negro */
    --bg-panel: #0a0e17;     /* Fondo paneles */
    --primary: #7b2cbf;      /* Morado Jano */
    --accent: #4cc9f0;       /* Cyan Neon */
    --success: #00b4d8;      /* Azul éxito */
    --text-main: #e0e6ed;
    --text-muted: #94a3b8;
    --glass: rgba(20, 30, 48, 0.6);
    --glass-border: 1px solid rgba(255, 255, 255, 0.08);
    --glow-shadow: 0 0 20px rgba(123, 44, 191, 0.25);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Poppins', sans-serif; /* Lectura fácil */
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(123, 44, 191, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(76, 201, 240, 0.1) 0%, transparent 40%);
    color: var(--text-main);
    min-height: 100vh;
    padding-bottom: 80px; /* Espacio para scroll móvil */
}

h1, h2, h3, h4 { font-family: 'Montserrat', sans-serif; font-weight: 700; letter-spacing: -0.5px; }

/* --- Layout --- */
.container { max-width: 1000px; margin: 0 auto; padding: 20px; }

.flex-between { display: flex; justify-content: space-between; align-items: center; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }

/* --- Textos --- */
.text-gradient {
    background: linear-gradient(135deg, #fff 30%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.text-sm { font-size: 0.85rem; color: var(--text-muted); }

/* --- Tarjetas Glass --- */
.card {
    background: var(--glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: var(--glass-border);
    border-radius: 24px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    border-color: rgba(76, 201, 240, 0.3);
    transform: translateY(-3px);
}

/* Tarjeta Destacada (Próxima Clase) */
.card.highlight {
    background: linear-gradient(145deg, rgba(123, 44, 191, 0.15), rgba(10, 14, 23, 0.8));
    border: 1px solid rgba(123, 44, 191, 0.3);
    position: relative;
    overflow: hidden;
}
.card.highlight::before {
    content: ''; position: absolute; top: 0; left: 0; width: 4px; height: 100%;
    background: var(--accent); box-shadow: 0 0 15px var(--accent);
}

/* --- Botones --- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 24px; border-radius: 14px; font-weight: 600; text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); cursor: pointer; border: none; font-size: 0.95rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, #560bad 100%);
    color: white; box-shadow: 0 4px 15px rgba(123, 44, 191, 0.4);
}
.btn-primary:hover { box-shadow: 0 6px 20px rgba(123, 44, 191, 0.6); transform: translateY(-2px); }

.btn-outline {
    background: transparent; border: 1px solid rgba(255,255,255,0.2); color: var(--text-main);
}
.btn-outline:hover { background: rgba(255,255,255,0.05); border-color: var(--accent); color: var(--accent); }

.btn-sm { padding: 8px 16px; font-size: 0.85rem; border-radius: 10px; }

/* --- Módulos / Lista --- */
.module-list { list-style: none; margin-top: 10px; }
.module-item {
    display: flex; align-items: center; justify-content: space-between;
    padding: 16px; margin-bottom: 10px;
    background: rgba(255, 255, 255, 0.03); border-radius: 16px;
    border: 1px solid transparent; transition: 0.2s;
}
.module-item:hover { background: rgba(255, 255, 255, 0.06); border-color: rgba(76, 201, 240, 0.2); }

.icon-box {
    width: 42px; height: 42px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; margin-right: 15px; flex-shrink: 0;
}
.icon-video { background: rgba(247, 37, 133, 0.15); color: #f72585; }
.icon-pdf { background: rgba(76, 201, 240, 0.15); color: #4cc9f0; }

/* --- Stats --- */
.stat-box {
    text-align: center; padding: 20px; background: rgba(255,255,255,0.02); border-radius: 18px;
}
.stat-num { font-size: 1.8rem; font-weight: 700; color: white; display: block; margin-bottom: 4px; }
.stat-label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }

/* --- Responsive --- */
@media (max-width: 600px) {
    .container { padding: 15px; }
    .module-item { flex-direction: column; align-items: flex-start; gap: 12px; }
    .module-item .btn { width: 100%; }
    .header-nav h1 { font-size: 1.5rem; }
}