/* ============================================
   UNIVEROO MODERN FRONTEND - CSS
   Clean, Modern, Mobile-First Design
   ============================================ */

/* === BASE STYLES === */
:root {
    --primary: #7367f0;
    --primary-hover: #5e50ee;
    --primary-light: #e8e6fc;
    --secondary: #a8aaae;
    --success: #28c76f;
    --info: #00cfe8;
    --warning: #ff9f43;
    --danger: #ea5455;
    --light: #f8f9fa;
    --dark: #4b465c;
    --white: #ffffff;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === HEADER === */
.site-header {
    position: relative;
    z-index: 1000;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
}

.navbar-light .navbar-nav .nav-link {
    color: var(--dark);
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: var(--transition);
}

.navbar-light .navbar-nav .nav-link:hover {
    color: var(--primary);
}

.navbar-light .navbar-nav .nav-link i {
    font-size: 1rem;
}

/* Search Bar */
.input-group .form-control {
    border-right: none;
    font-size: 0.95rem;
}

.input-group .form-control:focus {
    border-color: var(--primary);
    box-shadow: none;
}

.input-group .btn {
    border-left: none;
    padding: 0.5rem 1.5rem;
}

/* Cart Badge */
#cartCount {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    vertical-align: top;
}

/* === BOOK CARDS === */
.book-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.book-card:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    transform: translateY(-4px);
}

.book-cover-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 140%; /* 5:7 aspect ratio */
    overflow: hidden;
    background: var(--light);
}

.book-cover {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

/* Book Overlay */
.book-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    padding: 2rem 1rem 1rem;
    transform: translateY(100%);
    transition: var(--transition);
}

.book-card:hover .book-overlay {
    transform: translateY(0);
}

/* Book Details */
.book-details {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.book-title {
    font-size: 0.9rem;
    line-height: 1.3;
    font-weight: 600;
    min-height: 2.6em;
    margin-bottom: 0.5rem;
}

.book-title a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

.book-title a:hover {
    color: var(--primary);
}

.price {
    font-size: 1.25rem;
    color: var(--primary);
}

/* === HERO SECTION === */
.hero-section {
    background: linear-gradient(135deg, var(--primary) 0%, #0a58ca 100%);
}

.hero-section .display-4 {
    font-weight: 800;
    line-height: 1.2;
}

@media (max-width: 768px) {
    .hero-section .display-4 {
        font-size: 2rem;
    }
}

/* === FILTER SIDEBAR === */
.filter-sidebar {
    position: sticky;
    top: 80px;
}

.filter-sidebar h6 {
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--dark);
    margin-bottom: 1rem;
}

.filter-sidebar .form-check {
    padding: 0.5rem 0;
}

.filter-sidebar .form-check-label {
    cursor: pointer;
    font-size: 0.95rem;
    padding-left: 0.5rem;
}

.filter-sidebar .form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
}

.filter-sidebar .form-check-input:checked {
    background-color: var(--primary);
    border-color: var(--primary);
}

.filter-sidebar .form-select {
    font-size: 0.95rem;
    padding: 0.5rem;
}

/* === BUTTONS === */
.btn {
    font-weight: 600;
    padding: 0.5rem 1.5rem;
    border-radius: 6px;
    transition: var(--transition);
    min-height: 44px; /* Touch target */
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
}

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
}

.btn-primary:hover {
    background: #0a58ca;
    border-color: #0a58ca;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.4);
}

.btn-light {
    background: white;
    border-color: white;
    color: var(--dark);
}

.btn-light:hover {
    background: var(--light);
    border-color: var(--light);
}

.btn-outline-light {
    border: 2px solid white;
    color: white;
}

.btn-outline-light:hover {
    background: white;
    color: var(--primary);
}

/* === BADGES === */
.badge {
    font-weight: 600;
    padding: 0.35rem 0.75rem;
    font-size: 0.75rem;
    border-radius: 4px;
}

/* === FORMS === */
.form-control,
.form-select {
    border: 1px solid #dee2e6;
    border-radius: 6px;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.15);
}

/* === STEP ICONS === */
.step-icon {
    font-size: 2rem;
    transition: var(--transition);
}

.step-icon:hover {
    transform: scale(1.1);
}

/* === PAGINATION === */
.pagination {
    margin: 0;
}

.page-link {
    color: var(--primary);
    border-color: #dee2e6;
    padding: 0.5rem 0.75rem;
    font-weight: 500;
    transition: var(--transition);
}

.page-link:hover {
    color: var(--primary);
    background-color: var(--light);
}

.page-item.active .page-link {
    background-color: var(--primary);
    border-color: var(--primary);
}

/* === FOOTER === */
.site-footer {
    margin-top: auto;
}

.site-footer a {
    transition: var(--transition);
}

.site-footer a:hover {
    color: white !important;
}

/* === BREADCRUMB === */
.breadcrumb {
    background: transparent;
    padding: 0;
    margin-bottom: 0.5rem;
}

.breadcrumb-item a {
    color: var(--primary);
    text-decoration: none;
}

.breadcrumb-item.active {
    color: var(--secondary);
}

/* === RESPONSIVE === */

/* Tablet */
@media (max-width: 991px) {
    .hero-section {
        text-align: center;
    }

    .book-card {
        max-width: 100%;
    }

    .filter-sidebar {
        position: static;
    }
}

/* Mobile */
@media (max-width: 576px) {
    .btn-lg {
        padding: 0.6rem 1.5rem;
        font-size: 1rem;
    }

    .book-title {
        font-size: 0.85rem;
    }

    .price {
        font-size: 1.1rem;
    }

    .book-details {
        padding: 0.75rem !important;
    }

    .step-icon {
        width: 60px !important;
        height: 60px !important;
    }

    .step-icon span {
        font-size: 1.5rem !important;
    }
}

/* === UTILITIES === */
.shadow-sm {
    box-shadow: 0 2px 8px rgba(0,0,0,0.08) !important;
}

.rounded {
    border-radius: 8px !important;
}

/* Touch-friendly minimum sizes */
button,
a.btn,
.nav-link,
.form-check-label {
    min-height: 44px;
    min-width: 44px;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus states for accessibility */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Loading state */
.loading {
    pointer-events: none;
    opacity: 0.6;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 3px solid var(--primary);
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Print styles */
@media print {
    .site-header,
    .site-footer,
    .filter-sidebar,
    .btn {
        display: none !important;
    }
}