/* Main Custom CSS */

/* Global Styles */
:root {
    --primary-color: #0b1f3a;
    --primary-light: #143d6b;
    --primary-dark: #071629;
    --secondary-color: #6c757d;
    --success-color: #059669;
    --danger-color: #dc2626;
    --warning-color: #d97706;
    --info-color: #0891b2;
    --light-color: #f8fafc;
    --dark-color: #1e293b;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
}

/* Hero Section */
/* Banner (Non-Gradient) */
.home-banner {
    background: #0d6efd10; /* subtle primary tint */
    border-bottom: 1px solid var(--gray-200);
    padding: 3rem 0;
}

.banner-title {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.banner-subtitle {
    font-size: 1.125rem;
    color: var(--gray-700);
    margin-bottom: 1.5rem;
}

.banner-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
}

.hero-stats .stat-item {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 1.5rem 1rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-stats .stat-item h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

/* Book Card Styles */
.book-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    overflow: hidden;
    cursor: pointer;
    position: relative;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.book-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.book-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.book-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 2;
}

.bestseller-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 2;
}

.new-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    z-index: 2;
}

.book-info {
    padding: 15px;
    display: flex;
    flex-direction: column;
    height: calc(100% - 200px);
}

.book-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--gray-800);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Price block with fixed height to keep actions at bottom */
.price-block {
    min-height: 48px;
    margin-bottom: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.price-current {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--danger-color);
    line-height: 1.2;
}

.price-row { display:none; }
.price-new { display:none; }
.book-price { display:none; }

.price-old {
    color: var(--gray-500);
    text-decoration: line-through;
    font-size: 0.95rem;
}

.badge-promo {
    position: absolute;
    left: 10px;
    top: 10px;
    z-index: 2;
}

.book-stats {
    display: flex;
    align-items: center;
    gap: 10px;
}
.book-actions {
    margin-top: auto;
}

.book-stats small {
    font-size: 0.85rem;
}

/* BookStore Navigation Styles */
.bookstore-navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)) !important;
    box-shadow: 0 4px 20px rgba(30, 58, 138, 0.3);
    border-bottom: 3px solid var(--primary-light);
    height: 60px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1030;
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: white !important;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-logo {
    display: none;
}

.navbar-logo:hover {
    transform: scale(1.1);
    filter: brightness(0) invert(1) drop-shadow(0 0 8px rgba(255, 255, 255, 0.5));
}

.brand-text {
    background: linear-gradient(45deg, #fff, #e0f2fe);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Search Bar */
.navbar-search {
    flex: 1;
    max-width: 500px;
    margin: 0 2rem;
}

.search-input-group {
    position: relative;
    display: flex;
    align-items: center;
    border: 2px solid rgba(255, 255, 255, 0.25);
    border-radius: 12px;
    padding-right: calc(1.5em + 0.75rem + 4px);
    background: rgba(255, 255, 255, 0.08);
}

.search-input {
    border: none !important;
    background: transparent;
    color: white;
    padding: 0.375rem 0.75rem;
    border-radius: 12px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    height: calc(1.5em + 0.75rem + 4px);
    line-height: 1.5;
    width: 100%;
    outline: none !important;
}

.search-input:focus {
    outline: none !important;
}

.search-input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.search-input:focus {
    background: transparent;
    color: #fff;
    outline: none !important;
    box-shadow: none !important;
}

.search-input:focus::placeholder {
    color: var(--gray-500);
}

.btn-search {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%) !important;
    background: transparent;
    border: none;
    color: white;
    border-radius: 0 10px 10px 0;
    width: calc(1.5em + 0.75rem + 4px);
    height: calc(1.5em + 0.75rem + 4px);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease, color 0.2s ease;
    line-height: 1.5;
}

.btn-search:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    transform: translateY(-50%) !important;
}

/* Prevent global .btn:hover from altering search button position */
.btn.btn-search:hover,
.btn.btn-search:focus,
.btn.btn-search:active {
    transform: translateY(-50%) !important;
}

.navbar-nav .nav-link {
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9) !important;
    transition: all 0.3s ease;
    padding: 0.75rem 1rem !important;
    border-radius: 8px;
    margin: 0 0.25rem;
}

.navbar-nav .nav-link:hover {
    color: white !important;
    background-color: rgba(255, 255, 255, 0.1);
}

.navbar-nav .nav-link.active {
    background-color: rgba(255, 255, 255, 0.2);
    color: white !important;
}

/* Admin and User Menu Styles */
.admin-menu {
    background: rgba(255, 255, 255, 0.1) !important;
    border-radius: 8px !important;
}

.user-menu {
    background: rgba(255, 255, 255, 0.05) !important;
    border-radius: 8px !important;
}

.dropdown-menu {
    border: none;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    border-radius: 12px;
    padding: 0.5rem 0;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.dropdown-item {
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    color: var(--gray-700);
    transition: all 0.3s ease;
}

.dropdown-item:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(5px);
}

/* Main Content */
main {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
    background-color: var(--gray-50);
    margin-top: 60px;
}

/* Admin pages without navbar */
main.admin-fullscreen {
    margin-top: 0;
    padding: 0;
    min-height: 100vh;
}

/* Admin Layout Fix */
.admin-layout {
    margin-top: 0 !important;
    padding-top: 0 !important;
    background-color: var(--gray-50);
    min-height: 100vh;
}

.admin-main-content {
    margin-left: 0;
    padding-top: 2rem;
}

/* Card Styles - Base */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(30, 58, 138, 0.06);
    transition: all 0.3s ease;
    background: white;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(30, 58, 138, 0.12);
}

/* Home Loading Styles */
.content-loading {
    padding: 4rem 0;
    text-align: center;
    background-color: var(--gray-50);
}

.content-loading .loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.content-loading .spinner-border {
    width: 2.5rem;
    height: 2.5rem;
    border-width: 0.25rem;
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: 12px 12px 0 0 !important;
    border: none;
    padding: 1rem 1.25rem;
    font-weight: 600;
    font-size: 0.95rem;
}

.card-body {
    padding: 1.25rem;
}

/* Card Size Variants */
.card-sm {
    border-radius: 8px;
}

.card-sm .card-header {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    border-radius: 8px 8px 0 0 !important;
}

.card-sm .card-body {
    padding: 1rem;
}

.card-lg {
    border-radius: 16px;
}

.card-lg .card-header {
    padding: 1.5rem 2rem;
    font-size: 1.1rem;
    border-radius: 16px 16px 0 0 !important;
}

.card-lg .card-body {
    padding: 2rem;
}

/* Card Types */
.card-primary {
    border-left: 4px solid var(--primary-color);
}

.card-success {
    border-left: 4px solid var(--success-color);
}

.card-info {
    border-left: 4px solid var(--info-color);
}

.card-warning {
    border-left: 4px solid var(--warning-color);
}

.card-danger {
    border-left: 4px solid var(--danger-color);
}

/* Button Styles - Base */
.btn {
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    font-size: 0.875rem;
    line-height: 1.4;
}

/* Button Size Variants */
.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
    border-radius: 6px;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: 10px;
}

.btn-xl {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: 12px;
}

/* Button Types */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: 0 2px 8px rgba(30, 58, 138, 0.2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(30, 58, 138, 0.3);
    color: white;
}

.btn-outline-primary {
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(30, 58, 138, 0.2);
}

.btn-outline-secondary {
    border: 1px solid var(--gray-400);
    color: var(--gray-600);
    background: transparent;
    height: calc(1.5em + 0.75rem + 2px);
    line-height: 1.5;
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn-outline-secondary:hover {
    background: var(--gray-100);
    color: var(--gray-700);
    border-color: var(--gray-500);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #047857);
    color: white;
    box-shadow: 0 2px 8px rgba(5, 150, 105, 0.2);
}

.btn-success:hover {
    background: linear-gradient(135deg, #047857, var(--success-color));
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(5, 150, 105, 0.3);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), #b91c1c);
    color: white;
    box-shadow: 0 2px 8px rgba(220, 38, 38, 0.2);
}

.btn-danger:hover {
    background: linear-gradient(135deg, #b91c1c, var(--danger-color));
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(220, 38, 38, 0.3);
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-color), #d97706);
    color: white;
    box-shadow: 0 2px 8px rgba(217, 119, 6, 0.2);
}

.btn-warning:hover {
    background: linear-gradient(135deg, #d97706, var(--warning-color));
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(217, 119, 6, 0.3);
    color: white;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

/* Form Styles */
.form-control {
    border-radius: 8px;
    border: 1px solid var(--gray-300);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    padding: 0.375rem 0.5rem;
    font-size: 0.875rem;
    height: calc(1.5em + 0.75rem + 2px);
    line-height: 1.5;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(30, 58, 138, 0.15);
}

.form-control-sm {
    padding: 0.25rem 0.375rem !important;
    font-size: 0.8rem !important;
    border-radius: 6px !important;
    height: calc(1.5em + 0.5rem + 2px) !important;
    line-height: 1.5 !important;
}

.form-control-lg {
    padding: 0.5rem 0.75rem;
    font-size: 1rem;
    border-radius: 10px;
    height: calc(1.5em + 1rem + 2px);
    line-height: 1.5;
}

/* Form Select Styles */
.form-select {
    border-radius: 8px;
    border: 1px solid var(--gray-300);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    padding: 0.375rem 0.5rem;
    font-size: 0.875rem;
    background-color: white;
    height: calc(1.5em + 0.75rem + 2px);
    line-height: 1.5;
}

/* Admin filter rows: đảm bảo input date & select cùng chiều cao */
.admin-filter-row .form-control,
.admin-filter-row .form-select {
    height: calc(1.5em + 0.75rem + 2px);
    line-height: 1.5;
    padding-top: 0.375rem;
    padding-bottom: 0.375rem;
}

.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(30, 58, 138, 0.15);
}

.form-select-sm {
    padding: 0.25rem 0.375rem !important;
    font-size: 0.8rem !important;
    border-radius: 6px !important;
    height: calc(1.5em + 0.5rem + 2px) !important;
    line-height: 1.5 !important;
}

.form-select-lg {
    padding: 0.5rem 0.75rem;
    font-size: 1rem;
    border-radius: 10px;
    height: calc(1.5em + 1rem + 2px);
    line-height: 1.5;
}

/* Textarea Styles */
textarea.form-control {
    height: auto;
    min-height: calc(1.5em + 0.75rem + 2px);
    resize: vertical;
}

/* Table Form Elements - Ensure consistent height */
.table .form-control-sm,
.table .form-select-sm {
    height: calc(1.5em + 0.5rem + 2px) !important;
    line-height: 1.5 !important;
    vertical-align: middle !important;
}

/* Force table form elements to have same height */
.table td .form-control,
.table td .form-select {
    height: calc(1.5em + 0.75rem + 2px) !important;
    line-height: 1.5 !important;
    vertical-align: middle !important;
}

/* Input Group - Ensure consistent height */
.input-group .form-control,
.input-group .btn {
    height: calc(1.5em + 0.75rem + 2px) !important;
    line-height: 1.5 !important;
    vertical-align: middle !important;
}

/* Search box specific styling */
.input-group .btn-outline-secondary {
    height: calc(1.5em + 0.75rem + 2px);
    line-height: 1.5;
    padding: 0.375rem 0.75rem ;
    border-radius: 0 8px 8px 0;
    border: 1px solid var(--gray-300);
    border-left: none;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.input-group .form-control {
    border-radius: 8px 0 0 8px;
    border: 1px solid var(--gray-300);
    border-right: none;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.input-group .form-control:focus {
    border: 1px solid var(--primary-color) !important;
    border-right: none !important;
    box-shadow: 0 0 0 0.2rem rgba(30, 58, 138, 0.15) !important;
}

.input-group .form-control:focus + .btn-outline-secondary {
    border: 1px solid var(--primary-color) !important;
    border-left: none !important;
}

/* Search box with multiple buttons */
.input-group .btn-outline-secondary:not(:last-child) {
    border-radius: 0 !important;
    border-left: none !important;
    border-right: none !important;
}

.input-group .btn-outline-secondary:last-child {
    border-radius: 0 8px 8px 0 !important;
    border-left: none !important;
}

.input-group .form-control:focus ~ .btn-outline-secondary {
    border: 1px solid var(--primary-color) !important;
    border-left: none !important;
}

/* Summary Card Styling */
.summary-card {
    border: none;
    box-shadow: 0 4px 12px rgba(30, 58, 138, 0.1);
    transition: all 0.3s ease;
}

.summary-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(30, 58, 138, 0.15);
}

.summary-card .card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)) !important;
    color: white !important;
    border: none;
    padding: 1rem 1.25rem;
    font-weight: 600;
}

.summary-card .card-body {
    padding: 1.5rem;
    background: white;
}

.summary-item {
    text-align: center;
}

.summary-item .text-muted {
    font-size: 0.9rem;
    font-weight: 500;
}

.summary-item .fs-4 {
    font-weight: 700;
}

/* Spacing Utilities */
.p-sm { padding: 0.5rem !important; }
.p-md { padding: 1rem !important; }
.p-lg { padding: 1.5rem !important; }
.p-xl { padding: 2rem !important; }

.m-sm { margin: 0.5rem !important; }
.m-md { margin: 1rem !important; }
.m-lg { margin: 1.5rem !important; }
.m-xl { margin: 2rem !important; }

.mb-sm { margin-bottom: 0.5rem !important; }
.mb-md { margin-bottom: 1rem !important; }
.mb-lg { margin-bottom: 1.5rem !important; }
.mb-xl { margin-bottom: 2rem !important; }

.mt-sm { margin-top: 0.5rem !important; }
.mt-md { margin-top: 1rem !important; }
.mt-lg { margin-top: 1.5rem !important; }
.mt-xl { margin-top: 2rem !important; }

/* Text Sizes */
.text-xs { font-size: 0.75rem !important; }
.text-sm { font-size: 0.875rem !important; }
.text-base { font-size: 1rem !important; }
.text-lg { font-size: 1.125rem !important; }
.text-xl { font-size: 1.25rem !important; }
.text-2xl { font-size: 1.5rem !important; }
.text-3xl { font-size: 1.875rem !important; }

/* Icon Sizes */
.icon-xs { font-size: 0.75rem !important; }
.icon-sm { font-size: 1rem !important; }
.icon-md { font-size: 1.25rem !important; }
.icon-lg { font-size: 1.5rem !important; }
.icon-xl { font-size: 2rem !important; }
.icon-2xl { font-size: 2.5rem !important; }
.icon-3xl { font-size: 3rem !important; }

/* Badge Styles */
.badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: 500;
}

.badge-sm {
    font-size: 0.7rem;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
}

.badge-lg {
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
}

/* Table Styles */
.table-sm th,
.table-sm td {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
}

.table th {
    font-weight: 600;
    color: var(--gray-700);
    border-bottom: 2px solid var(--gray-200);
}

.table td {
    color: var(--gray-600);
    border-bottom: 1px solid var(--gray-200);
}

/* Admin specific styles */
.admin-main-content {
    padding: 1.5rem;
}

.admin-main-content .card {
    margin-bottom: 1rem;
}

.admin-main-content .row {
    margin-bottom: 1rem;
}

/* BookStore Homepage Styles */
.bookstore-homepage {
    margin-top: 60px;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 50%, var(--primary-color) 100%);
    color: white;
    position: relative;
    overflow: hidden;
    min-height: 100vh;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="bookPattern" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="5" cy="5" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="15" cy="15" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23bookPattern)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image {
    position: relative;
    z-index: 2;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Book Stack Animation */
.book-stack {
    position: relative;
    width: 200px;
    height: 250px;
}

.book {
    position: absolute;
    width: 60px;
    height: 80px;
    border-radius: 4px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    animation: float 3s ease-in-out infinite;
}

.book-1 {
    background: linear-gradient(45deg, #ff6b6b, #ee5a52);
    top: 0;
    left: 0;
    animation-delay: 0s;
}

.book-2 {
    background: linear-gradient(45deg, #4ecdc4, #44a08d);
    top: 20px;
    left: 20px;
    animation-delay: 0.5s;
}

.book-3 {
    background: linear-gradient(45deg, #45b7d1, #96c93d);
    top: 40px;
    left: 40px;
    animation-delay: 1s;
}

.book-4 {
    background: linear-gradient(45deg, #f9ca24, #f0932b);
    top: 60px;
    left: 60px;
    animation-delay: 1.5s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(2deg); }
}

/* Features Section */
.features-section {
    background: var(--gray-50);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: 0;
}

.feature-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 20px rgba(30, 58, 138, 0.08);
    transition: all 0.3s ease;
    height: 100%;
    border: 1px solid var(--gray-200);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(30, 58, 138, 0.15);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: white;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.feature-description {
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 0;
}

/* Stats Section */
.stats-section {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.stat-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 2rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.stat-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: 0;
}

/* Categories Section */
.categories-section {
    background: white;
}

.category-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 20px rgba(30, 58, 138, 0.08);
    transition: all 0.3s ease;
    height: 100%;
    border: 1px solid var(--gray-200);
}

/* Home categories: tighten vertical padding for even spacing */
.categories-section .category-card {
    padding: 0.75rem 1rem;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(30, 58, 138, 0.15);
}

.category-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
    color: white;
}

.category-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.category-count {
    color: var(--gray-600);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, var(--gray-800), var(--gray-900));
    color: white;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-description {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.cta-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .navbar-search {
        display: none !important;
    }
    
    .book-stack {
        width: 150px;
        height: 200px;
    }
    
    .book {
        width: 45px;
        height: 60px;
    }
}

/* Loading Spinner */
.spinner-border {
    width: 3rem;
    height: 3rem;
}

/* Alert Styles */
.alert {
    border-radius: 10px;
    border: none;
}

/* Feature Cards */
.feature-card {
    text-align: center;
    padding: 2rem;
    height: 100%;
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Team Member Cards */
.team-member {
    text-align: center;
    padding: 1.5rem;
}

.team-avatar {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Technology Tags */
.tech-tag {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.875rem;
    margin: 0.25rem;
}

/* Contact Form */
.contact-form {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
}

/* Footer */
footer {
    margin-top: auto;
}

/* Features Section */
.features-section {
    background: var(--gray-50);
}

.feature-card {
    background: white;
    border-radius: 12px;
    padding: 2rem 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid var(--gray-200);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    color: white;
    font-size: 1.5rem;
}

.feature-title {
    color: var(--gray-800);
    font-weight: 600;
    margin-bottom: 1rem;
}

.feature-description {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Categories Section */
.categories-section {
    background: white;
}

.category-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem 1rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid var(--gray-200);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border-color: var(--primary-color);
}

.category-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    color: white;
    font-size: 1.25rem;
}

.category-name {
    color: var(--gray-800);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.25rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .contact-form {
        padding: 1.5rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.slide-in-left {
    animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Utility Classes */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

/* Badge Primary */
.badge.bg-primary {
    background-color: var(--primary-color) !important;
    color: white !important;
}

.shadow-custom {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}