@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;600;700&display=swap');

:root {
    --primary: #000000;
    --accent: #2563eb;
    --bg: #f8fafc;
    --card: #ffffff;
    --text-main: #1e293b;
    --text-sec: #64748b; 
    --success: #10b981;
    --danger: #ef4444;
    --radius: 16px;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.04), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
}

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

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    display: flex;
    overflow-x: hidden;
}

/* --- PANTALLA DE CARGA (PRELOADER) --- */
#preloader {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: #fff;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: opacity 0.6s ease;
}

.spinner {
    width: 50px; height: 50px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* --- ANIMACIONES --- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

/* --- SIDEBAR --- */
aside {
    width: 280px; height: 100vh;
    background: var(--primary);
    color: white;
    padding: 40px 30px;
    position: fixed;
    animation: slideInLeft 0.5s ease;
}

aside .logo { font-weight: 700; font-size: 1.4rem; margin-bottom: 50px; letter-spacing: -1px; }

aside a {
    display: flex; align-items: center;
    color: #94a3b8; text-decoration: none;
    padding: 15px 0; font-size: 0.9rem; font-weight: 500;
    transition: 0.3s;
}

aside a:hover, aside a.active { color: white; transform: translateX(10px); }

/* --- MAIN CONTENT --- */
main { margin-left: 280px; padding: 60px; width: 100%; opacity: 0; animation: fadeInUp 0.6s ease forwards 0.5s; }

.header-flex { display: flex; justify-content: space-between; align-items: center; margin-bottom: 40px; }

/* --- CARDS --- */
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-bottom: 50px; }

.card {
    background: var(--card);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: 0.3s;
    position: relative; /* Importante para Chart.js */
    overflow: hidden;
}

/* Animación de pulso para el loader mientras carga la gráfica */
.spinner {
    box-shadow: 0 0 20px rgba(37, 99, 235, 0.2);
}

.card:hover { transform: translateY(-5px); box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1); }

.card small { font-size: 0.7rem; font-weight: 700; color: var(--text-sec); text-transform: uppercase; }

.card h3 { font-size: 1.8rem; margin-top: 10px; font-weight: 700; }

/* --- TABLAS --- */
.table-container {
    background: var(--card); border-radius: var(--radius);
    padding: 20px; box-shadow: var(--shadow);
}

table { width: 100%; border-collapse: collapse; }

th { text-align: left; padding: 20px; font-size: 0.75rem; color: var(--text-sec); text-transform: uppercase; border-bottom: 1px solid #f1f5f9; }

td { padding: 20px; font-size: 0.9rem; border-bottom: 1px solid #f8fafc; }

tr:hover { background: #fafafa; }

/* --- BOTONES & BADGES --- */
.btn {
    background: var(--primary); color: white; border: none;
    padding: 12px 25px; border-radius: 10px; font-weight: 600;
    text-decoration: none; cursor: pointer; transition: 0.3s; font-family: inherit;
}

.btn:hover { opacity: 0.8; transform: scale(1.05); }

.badge { padding: 6px 12px; border-radius: 8px; font-size: 0.7rem; font-weight: 700; }
.badge-success { background: #dcfce7; color: var(--success); }
.badge-warning { background: #fef9c3; color: #a16207; }

/* --- FORMULARIOS --- */
form { background: white; padding: 40px; border-radius: var(--radius); box-shadow: var(--shadow); max-width: 600px; }
.input-group { margin-bottom: 20px; }
label { display: block; font-size: 0.8rem; font-weight: 600; margin-bottom: 8px; }
input, select {
    width: 100%; padding: 12px; border: 1px solid #e2e8f0;
    border-radius: 10px; font-family: inherit; outline: none;
}
input:focus { border-color: var(--primary); }
/* Botón de descarga de plantilla */
.btn-outline {
    border: 1px solid var(--primary);
    color: var(--primary);
    background: transparent;
    padding: 12px;
    border-radius: 10px;
    text-align: center;
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    transition: 0.3s;
}

.btn-outline:hover {
    background: #f1f5f9;
    transform: translateY(-2px);
}

/* Ajuste para inputs de archivo */
input[type="file"]::file-selector-button {
    background: var(--bg);
    border: 1px solid #e2e8f0;
    padding: 8px 16px;
    border-radius: 8px;
    font-family: 'Montserrat';
    cursor: pointer;
    margin-right: 10px;
}