@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@700;900&family=DM+Sans:wght@400;500;600&display=swap');

:root {
    --primary:        #1648B9;
    --primary-dark:   #143d9e;
    --primary-light:  #eef3fc;
    --star-color:     #2a65ec;
    --bg:             #f7f8fa;
    --surface:        #ffffff;
    --text:           #1a1a1a;
    --text-muted:     #6b7280;
    --border:         #e5e7eb;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'DM Sans', sans-serif; background: var(--bg); color: var(--text); }

/* --- PAGE TITLE --- */
.page-title-bar { max-width: 1400px; margin: 0 auto; padding: 3rem 2rem 1rem; }
.page-title-bar h1 { font-family: 'Playfair Display', serif; font-size: 2.4rem; letter-spacing: -1px; }

/* --- LAYOUT PRINCIPAL --- */
.main-container {
    max-width: 1400px;
    margin: 1rem auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 0 2rem 4rem;
}

/* --- HORIZONTAL FILTERS --- */
.top-filters-bar {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px; /* Cortes rectos */
    padding: 2rem;
}

.search-main {
    display: flex;
    max-width: 700px;
    margin: 0 auto 1.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
    background: var(--bg);
}
.search-main:focus-within { border-color: var(--primary); }
.search-main input {
    flex-grow: 1; border: none; padding: 1rem 1.5rem; font-size: 1rem;
    outline: none; background: transparent;
}
.search-main button {
    padding: 0 2rem; background: var(--primary); color: #fff;
    border: none; cursor: pointer; font-size: 1.1rem; transition: background 0.2s;
}
.search-main button:hover { background: var(--primary-dark); }

.genres-row {
    display: flex; align-items: center; gap: 1.5rem;
    border-top: 1px solid var(--border); padding-top: 1.5rem;
}
.filter-label { font-size: 0.85rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; }

.genres-chips {
    display: flex; flex-wrap: wrap; gap: 0.6rem; flex-grow: 1;
}
.chip-item input[type="checkbox"] { display: none; }
.chip-item label {
    padding: 0.5rem 1rem; border: 1px solid var(--border); border-radius: 4px;
    font-size: 0.85rem; cursor: pointer; color: var(--text-muted);
    transition: all 0.2s; user-select: none;
}
.chip-item input[type="checkbox"]:checked + label {
    background: var(--primary-light); color: var(--primary);
    border-color: var(--primary); font-weight: 600;
}
.clear-filters-link {
    color: #e11d48; font-size: 0.85rem; text-decoration: none; font-weight: 600;
}
.clear-filters-link:hover { text-decoration: underline; }

/* --- TOOLBAR --- */
.results-toolbar {
    display: flex; justify-content: space-between; align-items: center;
    background: var(--surface); padding: 1rem 1.5rem; border-radius: 8px;
    border: 1px solid var(--border); margin-bottom: 2rem;
}
.sort-options select { border: 1px solid var(--border); border-radius: 6px; padding: 10px; }

/* --- GRID --- */
.ebook-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 2rem; }

.ebook-card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 10px; overflow: hidden; transition: 0.3s;
    display: flex; flex-direction: column;
}
.ebook-card:hover { transform: translateY(-6px); box-shadow: 0 10px 20px rgba(0,0,0,0.05); border-color: var(--primary); }

.card-image { aspect-ratio: 2/3; overflow: hidden; }
.card-image img { width: 100%; height: 100%; object-fit: cover; }

.card-content { padding: 1.25rem; flex-grow: 1; display: flex; flex-direction: column; }
.genre-tag { color: var(--primary); font-size: 0.65rem; font-weight: 700; text-transform: uppercase; margin-bottom: 0.4rem; }
.title a { text-decoration: none; color: var(--text); font-weight: 600; font-size: 1rem; }
.author { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.5rem; }

.card-footer { margin-top: auto; padding-top: 1rem; }
.btn-read {
    display: block; text-align: center; background: var(--primary-light); color: var(--primary);
    padding: 0.6rem; border-radius: 6px; text-decoration: none; font-weight: 600; transition: 0.2s;
}
.btn-read:hover { background: var(--primary); color: white; }

/* --- CORRECCIÓN EMPTY STATE --- */
.empty-state {
    grid-column: 1 / -1; /* Ocupa todas las columnas */
    display: flex; flex-direction: column; color: var(--text-muted);
    text-align: center; align-items: center; gap: 15px;
    padding: 4rem 2rem;
}
.empty-state i { color: var(--border); font-size: 3rem; }
.empty-state a { color: var(--primary); text-decoration: none; font-weight: 600; }
.empty-state a:hover { color: var(--primary-dark); text-decoration: underline; }

/* --- RESPONSIVE --- */
@media (max-width: 900px) {
    .page-title-bar { padding: 2rem 1rem 0.5rem; text-align: center; }
    .page-title-bar h1 { font-size: 2rem; }
    
    .main-container { padding: 0 1rem 2rem; }
    .top-filters-bar { padding: 1.2rem; }
    
    .genres-row { flex-direction: column; align-items: stretch; gap: 1rem; }
    
    /* En móvil, los géneros se deslizan horizontalmente */
    .genres-chips { 
        flex-wrap: nowrap; overflow-x: auto; padding-bottom: 5px; scrollbar-width: none;
    }
    .genres-chips::-webkit-scrollbar { display: none; }
    .chip-item { flex-shrink: 0; }
    
    .clear-filters-link { align-self: flex-end; }
    
    .results-toolbar { flex-direction: column; gap: 10px; align-items: flex-start; }
    .ebook-grid { grid-template-columns: repeat(auto-fill, minmax(145px, 1fr)); gap: 1rem; }
    .card-content { padding: 0.9rem; }
    .title a { font-size: 0.9rem; }
    .author { font-size: 0.75rem; }
    .btn-read { padding: 0.5rem; font-size: 0.85rem; }
}

@media (max-width: 400px) {
    .ebook-grid { grid-template-columns: 1fr; }
}