@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Rajdhani:wght@300;400;600;700&display=swap');

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-border: rgba(255, 255, 255, 0.1);

    /* Navbar Global Variables */
    --neon-pink: #ff0066;
    --neon-cyan: #00d4ff;
    --neon-green: #00ffa3;
}

/* Global Navigation Bar (Top) */
body > nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 11, 16, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 2px solid var(--neon-pink);
    font-family: 'Rajdhani', sans-serif;
}

body > nav .container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

body > nav .logo {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--neon-pink);
    text-shadow: 0 0 8px var(--neon-pink);
}

body > nav .nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

body > nav .nav-links a {
    color: #f0f0f0;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    position: relative;
    text-transform: uppercase;
}

body > nav .nav-links a:hover,
body > nav .nav-links a.active {
    color: var(--neon-cyan);
    text-shadow: 0 0 8px var(--neon-cyan);
}

body > nav .nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--neon-cyan);
    transition: width 0.3s;
}

body > nav .nav-links a:hover::after,
body > nav .nav-links a.active::after {
    width: 100%;
}

body > nav .mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
    padding: 0;
}

body > nav .mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--neon-cyan);
    transition: 0.3s;
}

@media (max-width: 768px) {
    body > nav .mobile-menu-btn {
        display: flex;
        justify-content: space-between;
        width: 30px;
        height: 20px;
        margin-left: auto;
    }

    body > nav .mobile-menu-btn span {
        width: 100%;
        flex-shrink: 0;
    }

    body > nav .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 250px;
        height: 100vh;
        background: #0a0b10;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        border-left: 2px solid var(--neon-pink);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.9);
        z-index: 11000;
        padding: 1rem 0;
        display: flex !important;
        gap: 0;
    }

    body > nav .nav-links.active {
        right: 0;
    }

    body > nav .nav-links li {
        width: 100%;
        text-align: center;
    }

    body > nav .nav-links a {
        font-size: 1.15rem;
        display: block;
        width: 100%;
        padding: 12px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        font-weight: 500;
    }

    /* Hamburger Animation */
    body > nav .mobile-menu-btn.active span:nth-child(1) {
        transform: translateY(8.5px) rotate(45deg);
    }
    body > nav .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    body > nav .mobile-menu-btn.active span:nth-child(3) {
        transform: translateY(-8.5px) rotate(-45deg);
    }
}

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

body {
    background-color: var(--bg-dark);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--text-main);
    line-height: 1.5;
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(139, 92, 246, 0.15) 0px, transparent 50%);
    min-height: 100vh;
    padding-top: 100px; /* Evita que el contenido quede debajo de la navbar fija */
}

.libros-main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    margin-bottom: 2rem;
    text-align: center;
}

.categories-nav {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
}

.cat-btn {
    padding: 0.6rem 1.2rem;
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 2rem;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
    backdrop-filter: blur(8px);
}

.cat-btn:hover {
    border-color: var(--primary-color);
    color: var(--text-main);
}

.cat-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto 2rem;
}

#search-input {
    width: 100%;
    padding: 1rem 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    color: white;
    font-size: 1.1rem;
    backdrop-filter: blur(12px);
    transition: all 0.3s ease;
}

#search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 2rem;
}

.book-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    border-radius: 1.25rem;
    overflow: hidden;
    backdrop-filter: blur(12px);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    flex-direction: column;
}

.book-card:hover {
    transform: translateY(-10px);
    border-color: rgba(99, 102, 241, 0.5);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
}

.cover-container {
    padding: 1rem;
    aspect-ratio: 1;
    overflow: hidden;
}

.cover-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 0.5rem;
    background: #1e293b;
    transition: transform 0.5s ease;
}

.book-card:hover .cover-img {
    transform: scale(1.05);
}

.book-info {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.book-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    height: 3.3rem;
}

.book-action {
    margin-top: auto;
    padding-top: 1rem;
}

.btn-open {
    display: block;
    width: 100%;
    padding: 0.75rem;
    text-align: center;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 0.75rem;
    font-weight: 600;
    transition: background 0.2s;
}

.btn-open:hover {
    background: var(--primary-hover);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.book-card {
    animation: fadeIn 0.5s ease-out forwards;
}