:root {
    --bg-color: #1c1c1c; /* Dark, warm charcoal */
    --primary-text-color: #ffffff;
    --accent-color: #ff7a00; /* Vibrant Orange */
    --accent-hover-color: #ff9933; /* Lighter Orange */
    --card-bg-color: #282828; /* Slightly lighter charcoal */
    --header-bg-color: rgba(28, 28, 28, 0.85);
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.5);
    --disabled-opacity: 0.5;
    --font-family: 'Inter', sans-serif;
    --border-radius: 12px;
}

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

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--primary-text-color);
    line-height: 1.6;
    min-height: 100vh;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--header-bg-color);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-color);
    letter-spacing: -0.02em;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--primary-text-color);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: background-color 0.3s ease;
}

.nav-toggle:hover {
    background-color: var(--card-bg-color);
}

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--primary-text-color);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    position: relative;
}

.nav-menu a:hover {
    color: var(--accent-color);
    background-color: rgba(255, 122, 0, 0.1);
}

.nav-close {
    display: none;
}

.hidden {
    display: none !important;
}

/* Main Container */
.main-container {
    margin-top: 80px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 2rem;
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 4rem 0 3rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 3rem;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
}

.hero-description {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
    font-weight: 400;
}

#textSearch {
    flex: 1;
    min-width: 300px;
    padding: 1rem 1.5rem;
    background-color: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--primary-text-color);
    font-size: 1rem;
    font-family: var(--font-family);
    transition: all 0.3s ease;
}

#textSearch:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(255, 122, 0, 0.2);
}

#textSearch::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

/* Search Container */
.search-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin: 1rem auto; /* Center the container */
    padding: 1rem;
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px var(--shadow-color);
    max-width: 1200px; /* Ensure it aligns with the main container */
    position: sticky; /* Keep it visible when scrolling */
    top: 80px; /* Adjust to match the header height */
    z-index: 100; /* Ensure it stays above other elements */
}

#searchInput {
    flex: 1;
    min-width: 300px;
    padding: 0.8rem 1rem;
    background-color: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--primary-text-color);
    font-size: 1rem;
    font-family: var(--font-family);
    transition: all 0.3s ease;
}

#searchInput:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(255, 122, 0, 0.2);
}

#searchInput::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

#searchButton,
#resetButton {
    padding: 0.8rem 1.5rem;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover-color));
    color: var(--primary-text-color);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all 0.3s ease;
}

#searchButton:hover,
#resetButton:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 122, 0, 0.4);
}

#searchButton:active,
#resetButton:active {
    transform: translateY(0);
}

/* Books Grid */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
    margin-top: 2rem; /* Add spacing below the search container */
}

.book-card {
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.book-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-hover-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.book-card:hover::before {
    transform: scaleX(1);
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(255, 122, 0, 0.2);
    border-color: var(--accent-color);
}

.book-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: calc(var(--border-radius) - 4px);
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}

.book-card:hover .book-image {
    transform: scale(1.02);
}

.book-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary-text-color);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-author {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.view-details-btn {
    width: 100%;
    padding: 0.8rem 1.5rem;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover-color));
    color: var(--primary-text-color);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.view-details-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 122, 0, 0.4);
}

.view-details-btn:active {
    transform: translateY(0);
}

/* Modal Styles */
.book-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    animation: modalFadeIn 0.3s ease forwards;
}

@keyframes modalFadeIn {
    to {
        opacity: 1;
    }
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 60px var(--shadow-color);
    animation: modalSlideIn 0.3s ease forwards;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(50px);
    }
    to {
        transform: translateY(0);
    }
}

.modal-close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--primary-text-color);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.modal-close-btn:hover {
    background-color: var(--bg-color);
    color: var(--accent-color);
}

.modal-image {
    width: 100%;
    max-width: 200px;
    height: auto;
    border-radius: var(--border-radius);
    margin: 0 auto 1.5rem;
    display: block;
}

.modal-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--accent-color);
    text-align: center;
}

.modal-author {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1.5rem;
    text-align: center;
}

.modal-description {
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
}

.modal-price {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 1rem;
    text-align: center;
}

.modal-stock {
    font-size: 1rem;
    text-align: center;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-weight: 600;
}

.modal-stock:contains('В наличии') {
    background-color: rgba(34, 197, 94, 0.2);
    color: #22c55e;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background-color: var(--bg-color);
        transition: right 0.3s ease;
        padding: 2rem;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-close {
        display: block;
        position: absolute;
        top: 1rem;
        right: 1rem;
        background: none;
        border: none;
        color: var(--primary-text-color);
        font-size: 1.5rem;
        cursor: pointer;
        padding: 0.5rem;
    }
    
    .nav-menu ul {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        margin-top: 3rem;
    }
    
    .nav-menu a {
        font-size: 1.2rem;
        display: block;
        width: 100%;
        padding: 1rem;
    }
    
    .header-content {
        padding: 1rem;
    }
    
    .main-container {
        padding: 0 1rem;
        margin-top: 70px;
    }
    
    .hero-section {
        padding: 2rem 0;
    }

    #textSearch {
        min-width: 100%;
    }
    
    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1.5rem;
    }
    
    .modal-content {
        width: 95%;
        padding: 1.5rem;
        margin: 1rem;
    }
}

@media (max-width: 480px) {
    .books-grid {
        grid-template-columns: 1fr;
    }
    
    .book-image {
        height: 250px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
}