:root { 
    --bg: #0f172a;
    --card: #1e293b;
    --accent: #6366f1;
    --text: #f8fafc;
    --muted: #64748b;
    --border: #334155;
    --shadow: 0 10px 25px -5px rgba(0,0,0,0.3); 
    --success: #10b981; 
}

/* Forzar modo oscuro siempre */
* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'SF Pro Display', sans-serif; -webkit-tap-highlight-color: transparent; color-scheme: dark; }

body { background: var(--bg); color: var(--text); overflow: hidden; height: 100vh; width: 100vw; }
.text-center { text-align: center; }
.flex-center { display: flex; justify-content: center; align-items: center; }

/* Pantalla de Login */
#login-screen { position: fixed; inset: 0; background: var(--bg); z-index: 2000; display: flex; flex-direction: column; align-items: center; transition: 0.8s; }
.login-container { flex: 1; display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 20px; }
.login-input { border: none; background: transparent; text-align: center; outline: none; color: var(--text); border-bottom: 2px solid var(--accent); font-size: 1.6rem; width: 280px; letter-spacing: 3px; padding-bottom: 8px; }
.floating-dot { width: 14px; height: 14px; background: var(--accent); border-radius: 50%; margin-bottom: 10px; animation: floatPulse 2.5s infinite ease-in-out; box-shadow: 0 0 15px var(--accent); }
@keyframes floatPulse { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-15px); } }
.login-footer { margin-bottom: 60px; font-size: 0.7rem; color: var(--muted); letter-spacing: 6px; text-transform: uppercase; }

/* Layout Principal */
#app-layout { display: none; grid-template-columns: 120px 1fr; height: 100vh; opacity: 0; transition: 1s; }

/* Navegación */
nav { background: var(--card); border-right: 1px solid var(--border); display: flex; flex-direction: column; padding: 2rem 0; }
.nav-item { cursor: pointer; text-align: center; color: var(--muted); background: none; border: none; padding: 15px 5px; width: 100%; outline: none; transition: 0.2s; }
.nav-item.active { color: var(--accent); font-weight: bold; }
.nav-item i { font-style: normal; font-size: 1.5rem; display: block; margin-bottom: 5px; }
.nav-item span { font-size: 0.6rem; font-weight: 800; text-transform: uppercase; display: block; }
.btn-exit { margin-top: auto; }

/* Contenido Principal */
main { padding: 2rem; overflow-y: auto; height: 100vh; width: 100%; }

/* Cabecera */
.header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 2rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border); }
#view-title { font-size: 1.2rem; font-weight: 700; margin: 0; letter-spacing: 1px; }

.tasa-badge { background: var(--card); padding: 5px 10px; border-radius: 7px; border: 1px solid var(--border); display: flex; align-items: center; gap: 6px; }
.tasa-badge input { border: none; background: transparent; width: 60px; text-align: center; color: var(--accent); font-weight: 900; outline: none; font-size: 1rem; }

.stat-card { background: var(--card); padding: 1.5rem; border-radius: 20px; border: 1px solid var(--border); box-shadow: var(--shadow); margin-bottom: 1.5rem; }

/* Buscador */
.search-box { padding: 1.2rem; border-radius: 15px; border: 2px solid var(--border); background: var(--card); color: var(--text); width: 100%; margin-bottom: 2rem; outline: none; font-size: 1rem; transition: 0.3s; }
.search-box:focus { border-color: var(--accent); }

/* Botones */
.btn-main { background: var(--accent); color: white; border: none; padding: 12px 24px; border-radius: 12px; font-weight: 800; cursor: pointer; transition: 0.2s; }
.btn-main:active { transform: scale(0.98); }
.btn-excel { background: #16a34a !important; display: inline-flex; align-items: center; gap: 8px; }

/* Tablas */
.report-table { width: 100%; border-collapse: separate; border-spacing: 0 8px; }
.report-table td { padding: 1rem; background: var(--card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); text-align: center; }
.report-table th { color: var(--muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 1px; padding: 0 1rem 0.5rem 1rem; }

/* POS y Carrito */
.pos-grid { display: grid; grid-template-columns: 1fr 320px; gap: 2rem; }
.items-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 1.2rem; }
.cart-container { background: var(--card); padding: 1.5rem; border-radius: 20px; border: 1px solid var(--border); height: fit-content; position: sticky; top: 0; }
.cart-scroll { max-height: 45vh; overflow-y: auto; margin: 15px 0; padding-right: 5px; }
.total-row-center { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--border); }

/* Estadísticas */
.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-bottom: 2rem; }
.method-totals-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 1rem; margin-bottom: 2rem; }
.method-card { background: var(--card); border: 1px solid var(--border); padding: 15px; border-radius: 15px; text-align: center; }

.txt-accent { color: var(--accent); font-weight: 700; }
.section { display: none; }
.section.active { display: block; }

#toast { position: fixed; top: -100px; left: 50%; transform: translateX(-50%); background: var(--success); color: white; padding: 1rem 2rem; border-radius: 50px; font-weight: 800; z-index: 3000; transition: 0.5s; }
#toast.show { top: 20px; }

/* --- OPTIMIZACIÓN MÓVIL (SISTEMA PRIVADO) --- */
@media (max-width: 768px) {
    #app-layout { grid-template-columns: 1fr; width: 100%; }
    
    nav { 
        position: fixed; bottom: 0; left: 0; width: 100%; height: 75px; 
        flex-direction: row; border-right: none; border-top: 1px solid var(--border); 
        padding: 0; z-index: 1000; background: var(--card);
        padding-bottom: env(safe-area-inset-bottom);
    }

    .nav-item { padding: 10px 0 !important; flex: 1; margin: 0 !important; }
    .nav-item i { font-size: 1.3rem; }
    .nav-item span { font-size: 0.55rem; }

    main { 
        padding: 1rem; 
        padding-bottom: 100px; 
        height: 100vh; 
        width: 100%; 
        overflow-x: hidden; 
    }

    /* Arreglo para que los filtros de fecha no se corten */
    #rep .flex-center { 
        flex-wrap: wrap !important; 
        gap: 15px !important; 
    }

    #rep-filter-date { 
        width: 100% !important; 
        max-width: 220px; 
    }

    .header { flex-wrap: wrap; gap: 10px; justify-content: center; }
    #view-title { width: 100%; text-align: center; margin-bottom: 5px; }

    .pos-grid, .stats-grid { grid-template-columns: 1fr; }
    .items-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); }
    
    .cart-container { width: 100%; position: relative; }

    /* Ajuste de tablas para que deslicen internamente sin empujar el sistema */
    .section { width: 100%; overflow-x: auto; padding-bottom: 10px; }
    .report-table { min-width: 550px; }
    .report-table td { padding: 0.8rem 0.5rem; font-size: 0.75rem; }

    .method-totals-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
}