/* ============================================================
   PALETA BEN SHEN - SISTEMA DE TEMAS & ESTILOS GLOBALES
   ============================================================ */

/* TEMA OSCURO (Por Defecto) */
:root {
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --bg-input: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --primary-blue: #0284c7;
    --primary-hover: #0369a1;
    --accent-blue: #38bdf8;
    
    /* ALERTAS MÉDICAS INMUNES (Fijas para diagnóstico) */
    --alert-danger-bg: rgba(244, 63, 94, 0.15);
    --alert-danger-border: #f43f5e;
    --alert-danger-text: #fca5a5;
    
    --alert-warning-bg: rgba(245, 158, 11, 0.15);
    --alert-warning-border: #f59e0b;
    --alert-warning-text: #fcd34d;

    --badge-active-bg: rgba(34, 197, 94, 0.15);
    --badge-active-border: #22c55e;
    --badge-active-text: #4ade80;
}

/* TEMA CLARO */
[data-theme="light"] {
    --bg-main: #f1f5f9;
    --bg-card: #ffffff;
    --bg-input: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #cbd5e1;
    --primary-blue: #0284c7;
    --primary-hover: #0369a1;
    --accent-blue: #0284c7;
    
    /* ALERTAS MÉDICAS INMUNES EN TEMA CLARO */
    --alert-danger-bg: #fff1f2;
    --alert-danger-border: #f43f5e;
    --alert-danger-text: #be123c;
    
    --alert-warning-bg: #fffbe3;
    --alert-warning-border: #f59e0b;
    --alert-warning-text: #b45309;

    --badge-active-bg: #f0fdf4;
    --badge-active-border: #22c55e;
    --badge-active-text: #15803d;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', system-ui, sans-serif; transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease; }

body { 
    background: var(--bg-main); 
    color: var(--text-main); 
    min-height: 100vh; 
    padding-bottom: 40px;
    position: relative;
}

/* MARCA DE AGUA DEL FONDO (ISOTIPO / MARCA TRANSLÚCIDA) */
body::before {
    content: "";
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    height: 500px;
    background-image: url('../img/logo.webp');
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    opacity: 0.03; /* Muy tenue para no estorbar la lectura */
    pointer-events: none;
    z-index: 0;
}

.main-wrapper { position: relative; z-index: 1; max-width: 1200px; margin: 0 auto; padding: 20px 15px; }

/* NAVBAR UNIVERSAL */
.navbar { background: var(--bg-card); border-bottom: 1px solid var(--border-color); padding: 12px 20px; display: flex; justify-content: space-between; align-items: center; position: sticky; top: 0; z-index: 100; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.nav-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--accent-blue); font-weight: 800; font-size: 18px; }
.nav-brand img { max-height: 38px; }

.nav-links { display: flex; align-items: center; gap: 15px; }
.nav-link { color: var(--text-muted); text-decoration: none; font-size: 13.5px; font-weight: 600; padding: 8px 12px; border-radius: 6px; }
.nav-link:hover, .nav-link.active { color: var(--text-main); background: rgba(2, 132, 199, 0.1); }

.theme-toggle-btn { background: var(--bg-main); border: 1px solid var(--border-color); color: var(--text-main); padding: 6px 12px; border-radius: 20px; cursor: pointer; font-size: 14px; display: flex; align-items: center; gap: 6px; font-weight: 600; }
.theme-toggle-btn:hover { border-color: var(--primary-blue); }

/* TARJETAS CONTENEDORAS */
.card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 14px; padding: 22px; margin-bottom: 20px; box-shadow: 0 8px 20px -4px rgba(0,0,0,0.15); }

/* ALERTAS MÉDICAS INMUNES */
.alert-box-danger { background: var(--alert-danger-bg); border: 1px solid var(--alert-danger-border); color: var(--alert-danger-text); border-radius: 8px; padding: 12px; font-weight: 700; margin-bottom: 15px; }
.alert-box-warning { background: var(--alert-warning-bg); border: 1px solid var(--alert-warning-border); color: var(--alert-warning-text); border-radius: 8px; padding: 12px; font-weight: 700; margin-bottom: 15px; }

@media (max-width: 768px) {
    .nav-links { display: none; } /* En móvil se simplifica */
}