/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

:root {
    /* PALETA VERDE INSTITUCIONAL PNP */
    --primary-gradient: linear-gradient(135deg, #034828 0%, #066e3e 100%);
    --accent-color: #034828; 
    --secondary-color: #6c757d;
    --background-color: #f4f6f9;
    --card-bg: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    
    /* Sombras y Bordes */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --radius-md: 15px; /* Bordes un poco más redondeados */
    --radius-lg: 20px;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

/* NAVBAR VERDE */
.navbar {
    background: var(--primary-gradient) !important;
    box-shadow: 0 4px 20px rgba(3, 72, 40, 0.4); /* Sombra más intensa en el navbar */
    padding: 0.8rem 0;
    border-bottom: 3px solid #cbbe07; 
}

.navbar-brand { font-weight: 700; font-size: 1.5rem; letter-spacing: 0.5px; }

.navbar .btn-outline-light {
    border-radius: 50px;
    padding: 0.5rem 1.5rem;
    font-weight: 600;
    border-width: 2px;
    transition: all 0.3s ease;
}
.navbar .btn-outline-light:hover {
    background-color: #fff;
    color: var(--accent-color);
    transform: scale(1.05); /* Pequeño zoom al botón */
}

/* --- LOGO ENCABEZADO --- */
.brand-logo {
    height: 55px; width: auto; margin-right: 15px;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}
.brand-text-container { line-height: 1.2; }
.brand-title { font-size: 1.5rem; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 2px; text-shadow: 0 2px 4px rgba(0,0,0,0.2); }
.brand-subtitle { font-size: 0.85rem; font-weight: 500; opacity: 0.95; white-space: normal; }

@media (min-width: 992px) {
    .brand-logo { height: 85px; margin-right: 25px; }
    .brand-text-container { line-height: 1; }
    .brand-title { font-size: 2.8rem; margin-bottom: 8px; }
    .brand-subtitle { font-size: 1.35rem; white-space: nowrap; }
}

/* --- TARJETAS DE LIBROS (SUPER EFECTO) --- */
/* --- TARJETAS DE LIBROS (DISEÑO PREMIUM) --- */
.card {
    border: 1px solid rgba(0,0,0,0.08); /* Borde inicial muy sutil */
    border-radius: var(--radius-md);
    background-color: var(--card-bg);
    box-shadow: var(--shadow-sm);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); /* Efecto rebote suave */
    overflow: hidden;
    position: relative;
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 1.25rem;
    font-weight: 600;
}

/* --- EFECTO HOVER (CUANDO PASAS EL MOUSE) --- */
.book-card:hover {
    /* 1. El fondo cambia a un verde menta suave degradado */
    background: linear-gradient(to bottom, #ffffff 0%, #e8f5e9 100%);
    
    /* 2. Se levanta y crece */
    transform: translateY(-12px) scale(1.02);
    
    /* 3. Sombra verdosa intensa (Glow) */
    box-shadow: 0 20px 40px rgba(3, 72, 40, 0.25);
    
    /* 4. Aparece un borde verde institucional */
    border-color: #034828;
}

/* Efecto en la imagen de portada al pasar el mouse sobre la tarjeta */
.book-card img {
    transition: transform 0.5s ease;
}
.book-card:hover img {
    transform: scale(1.08);
}

.book-card .card-body { padding: 1.5rem; }

/* Título del libro */
.book-card .card-title {
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

/* El título se pone VERDE al pasar el mouse */
.book-card:hover .card-title {
    color: #034828; 
}

.book-card .card-text { color: var(--text-secondary); }
/* --- ETIQUETAS Y BOTONES --- */
.badge { padding: 0.6em 1.2em; border-radius: 50px; font-weight: 600; letter-spacing: 0.5px; }
.category-badge { 
    background-color: #f0fff4 !important; /* Fondo verde muy pálido */
    color: #034828 !important; /* Letra verde oscuro */
    border: 1px solid #c6f6d5;
}

/* Botones Generales */
.btn-primary {
    background: var(--primary-gradient);
    border: none;
    box-shadow: 0 4px 6px rgba(3, 72, 40, 0.3);
}
.btn-primary:hover {
    background: var(--primary-gradient);
    opacity: 0.95;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(3, 72, 40, 0.4);
}

/* Botón "Leer" - Efecto especial */
.btn-outline-primary { 
    color: var(--accent-color); 
    border-color: var(--accent-color); 
    border-width: 2px;
    font-weight: 600;
    transition: all 0.3s ease;
}
.btn-outline-primary:hover { 
    background: var(--primary-gradient); 
    border-color: transparent; 
    color: #fff; 
    box-shadow: 0 5px 15px rgba(3, 72, 40, 0.3); /* Resplandor al hacer hover */
    transform: translateY(-2px);
}

/* --- LOGIN --- */
body.login-page {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    display: flex; align-items: center; justify-content: center;
}
.login-card {
    max-width: 420px; width: 100%; border-radius: var(--radius-lg);
    box-shadow: 0 20px 40px -5px rgba(3, 72, 40, 0.15); /* Sombra verde difusa */
}
.login-card .card-header {
    background: var(--primary-gradient); color: white; border-bottom: none; padding: 2rem 1rem; text-align: center;
}
.login-card .form-control:focus { border-color: #034828; box-shadow: 0 0 0 3px rgba(3, 72, 40, 0.15); }

/* --- BUSCADOR --- */
.search-container .input-group-text { background-color: #fff; border-right: none; border-radius: var(--radius-md) 0 0 var(--radius-md); }
.search-container .form-control { border-left: none; border-radius: 0; }
.input-group { 
    box-shadow: 0 5px 15px rgba(0,0,0,0.05); /* Sombra suave en el buscador */
    border-radius: var(--radius-md); 
    transition: box-shadow 0.3s;
}
/* El buscador brilla un poco al usarlo */
.input-group:focus-within {
    box-shadow: 0 5px 20px rgba(3, 72, 40, 0.15);
}

/* FILTRO CATEGORÍAS */
#categoryFilter {
    background-color: #034828 !important;
    color: #ffffff !important;
    font-weight: 700 !important;
    border: 2px solid #034828 !important;
    border-radius: 0 50px 50px 0 !important;
    padding-left: 20px;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23ffffff' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e") !important;
}
#categoryFilter option { background-color: #ffffff; color: #333333; }