:root {
    --primary: #1a2a3a;
    --accent: #3498db;
    --success: #2ecc71;
    --danger: #e74c3c;
    --warning: #f1c40f;
    --bg: #f4f7f6;
    --surface: #ffffff;
    --text: #444444;
    --muted: #666666;
    --border: #dddddd;
    --shadow: 0 10px 25px rgba(0,0,0,0.05);
}

/* Solo se declaran los nuevos valores de las variables */
html.dark-theme, body.dark-theme {
    --primary: #10151d;
    --accent: #5dade2;
    --success: #27ae60;
    --danger: #e74c3c;
    --warning: #f39c12;
    --bg: #0f172a;
    --surface: #1f2937;
    --text: #e5e7eb;
    --muted: #cbd5e1;
    --border: #334155;
    --shadow: 0 10px 25px rgba(0,0,0,0.4);
}

html {
    scroll-behavior: smooth;
}

body { 
    font-family: 'Inter', sans-serif; 
    background: var(--bg); 
    margin: 0; 
    color: var(--text); 
    line-height: 1.6; 
    transition: background 0.3s ease, color 0.3s ease; /* Transición suave para todos los PHP */
}

.container { 
    max-width: 1100px; 
    margin: 0 auto; 
    padding: 20px; 
}

/* Header Elegante */
header {
    background: var(--primary);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: background 0.3s ease;
}

.btn {
    padding: 8px 16px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    cursor: pointer;
}

.btn-primary { background: var(--accent); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-outline { border: 1px solid var(--border); color: var(--muted); background: var(--surface); }
.btn-outline:hover { background: var(--border); color: var(--text); }

/* Tablas y Listas */
.card-intro { 
    background: var(--surface); 
    border-radius: 12px; 
    padding: 60px 25px; 
    box-shadow: var(--shadow); 
    margin-bottom: 20px; 
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}
.card-intro input {
    padding: 10px;
    font-size: 1.5rem;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
}

table { width: 100%; border-collapse: collapse; margin-top: 15px; }
th { text-align: left; padding: 12px; border-bottom: 2px solid var(--border); color: var(--muted); text-transform: uppercase; font-size: 0.75rem; }
td { padding: 12px; border-bottom: 1px solid var(--border); }

/* Grid de carpetas (admin.php) */
.folder-flex { display: grid; gap: 20px; }
.folder-card { 
    background: var(--surface); padding: 20px; border-radius: 12px; text-decoration: none; color: var(--text);
    border: 1px solid var(--border); transition: 0.3s; display: flex; align-items: center; gap: 15px;
}
.folder-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--accent); }

/* Alertas */
.alert { padding: 15px; border-radius: 8px; margin-bottom: 20px; font-weight: 500; }
.alert-success { background: #d4edda; color: #155724; }
html.dark-theme .alert-success { background: #1e4620; color: #a3cfbb; } /* Ajuste de alerta en oscuro */

/* Estilos adicionales para Carrusel y Favoritos */
.carousel-track::-webkit-scrollbar { height: 8px; }
.carousel-track::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 10px; }
.carousel-track::-webkit-scrollbar-track { background: var(--surface); }

.fav-btn { color: var(--warning); margin-right: 10px; cursor: pointer; }
.card h2 { display: flex; align-items: center; }

/* RESPONSIVE */
@media (max-width: 1000px) {
    .card-intro { width: 90%; font-size: 2rem; max-width: 100%; text-align: center; }
    .card-intro input { padding: 30px; font-size: 2rem; }
    .card-intro button { padding: 50px; font-size: 2rem; }
    body { font-size: 2rem; }
    .btn { font-size: 1.8rem; padding: 10px 20px; }
    input { font-size: 2.3rem; }
}