/* ============================================
   MODERN COURSES LISTING PAGE STYLES
   Mobile-First, Premium Design
   ============================================ */

:root {
    --courses-primary: #667eea;
    --courses-primary-dark: #5568d3;
    --courses-secondary: #764ba2;
    --courses-success: #22c55e;
    --courses-text-dark: #1e293b;
    --courses-text-light: #64748b;
    --courses-bg-light: #f8fafc;
    --courses-border: #e2e8f0;
    --courses-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --courses-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --courses-shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --courses-radius: 12px;
    --courses-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    font-family: 'Poppins', sans-serif;
}

/* ============================================
   BREADCRUMB
   ============================================ */

.breadcrumb-nav {
    background: var(--courses-bg-light);
    padding: 16px 0;
    border-bottom: 1px solid var(--courses-border);
    margin-top: 0;
}

.breadcrumb {
    margin: 0;
    background: transparent;
    padding: 0;
}

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

.breadcrumb-item.active {
    color: var(--courses-text-light);
}

/* ============================================
   COURSES LISTING SECTION
   ============================================ */

.courses-listing-section {
    padding: 40px 0;
    min-height: 60vh;
    background: var(--white);
    margin-top: 0;
}

/* ============================================
   DESKTOP SIDEBAR (Categories)
   ============================================ */

.categories-sidebar {
    position: sticky;
    top: 100px;
    background: var(--white);
    border: 1px solid var(--courses-border);
    border-radius: var(--courses-radius);
    padding: 24px;
    box-shadow: var(--courses-shadow);
}

.sidebar-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--courses-text-dark);
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--courses-border);
}

.category-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-list li {
    margin-bottom: 8px;
}

.category-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--courses-text-dark);
    text-decoration: none;
    border-radius: 8px;
    transition: var(--courses-transition);
    font-size: 15px;
    font-weight: 500;
}

.category-link > i {
    font-size: 8px;
    color: var(--courses-text-light);
    transition: var(--courses-transition);
}

.category-icon,
.category-icon-mobile {
    font-size: 18px;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    text-align: center;
    flex-shrink: 0;
    transition: all 0.3s ease;
    position: relative;
}

.category-icon i,
.category-icon-mobile i {
    font-size: 18px;
    transition: all 0.3s ease;
    display: inline-block;
}

/* Icon animations */
.category-link:hover .category-icon i,
.category-link.active .category-icon i {
    transform: scale(1.2) rotate(5deg);
    color: var(--courses-primary);
}

.category-link-mobile:hover .category-icon-mobile i,
.category-link-mobile.active .category-icon-mobile i {
    transform: scale(1.15);
    animation: iconPulse 0.6s ease-in-out;
}

@keyframes iconPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

/* Icon background animation */
.category-link:hover .category-icon,
.category-link.active .category-icon {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    border-radius: 8px;
    animation: iconBackground 0.5s ease;
}

@keyframes iconBackground {
    0% {
        background: transparent;
    }
    100% {
        background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    }
}

.category-link-mobile:hover .category-icon-mobile,
.category-link-mobile.active .category-icon-mobile {
    animation: iconBounce 0.5s ease;
}

@keyframes iconBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-3px);
    }
}

.category-link span:first-of-type:not(.category-icon) {
    flex: 1;
}

.category-count {
    background: var(--courses-bg-light);
    color: var(--courses-text-light);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.category-link:hover .category-icon i,
.category-link.active .category-icon i {
    color: var(--courses-primary);
}

.category-link:hover,
.category-link.active {
    background: linear-gradient(135deg, var(--courses-primary) 0%, var(--courses-secondary) 100%);
    color: var(--white);
    transform: translateX(4px);
}

.category-link:hover .category-icon i,
.category-link.active .category-icon i {
    color: var(--white) !important;
}

.category-link:hover .category-count,
.category-link.active .category-count {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.category-link:hover i,
.category-link.active i {
    color: var(--white);
}

/* ============================================
   SEARCH BAR
   ============================================ */

.courses-header {
    margin-bottom: 32px;
}

.search-wrapper {
    position: relative;
    max-width: 600px;
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--courses-text-light);
    font-size: 20px;
    pointer-events: none;
}

.courses-listing-section .search-wrapper .search-input {
    width: 100%;
    padding: 14px 50px 14px 48px;
    border: 2px solid var(--courses-border);
    border-radius: var(--courses-radius);
    font-size: 16px;
    transition: var(--courses-transition);
    background: var(--white);
}

.courses-listing-section .search-wrapper .search-input:focus {
    outline: none;
    border-color: var(--courses-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.search-clear {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--courses-text-light);
    font-size: 20px;
    cursor: pointer;
    padding: 4px;
    transition: var(--courses-transition);
}

.search-clear:hover {
    color: var(--courses-primary);
}

/* ============================================
   COURSES TITLE & COUNT
   ============================================ */

.courses-title-wrapper {
    margin-bottom: 32px;
}

#coursesTitle {
    font-size: 32px;
    font-weight: 700;
    color: var(--courses-text-dark);
    margin-bottom: 8px;
}

.courses-count {
    color: var(--courses-text-light);
    font-size: 16px;
    margin: 0;
}

#coursesCountNumber {
    font-weight: 600;
    color: var(--courses-primary);
}

/* ============================================
   COURSES GRID
   ============================================ */

.courses-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin-bottom: 40px;
}

/* ============================================
   MODERN COURSE CARD
   ============================================ */

.course-card-modern {
    background: var(--white);
    border: 2px solid var(--courses-border);
    border-radius: var(--courses-radius);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    transition: var(--courses-transition);
    box-shadow: var(--courses-shadow);
    opacity: 1;
    transform: translateY(0);
    animation: fadeUp 0.5s ease-out forwards;
}

.course-card-modern.hidden {
    display: none;
}

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

.course-card-modern:hover {
    border-color: var(--courses-primary);
    transform: translateY(-4px);
    box-shadow: var(--courses-shadow-lg);
}

/* Course Icon Wrapper */
.course-icon-wrapper {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--courses-primary) 0%, var(--courses-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 28px;
    flex-shrink: 0;
}

.course-icon-wrapper i {
    font-size: 28px;
}

/* Course Info */
.course-info {
    flex: 1;
}

.course-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--courses-text-dark);
    margin-bottom: 12px;
    line-height: 1.3;
}

.course-rating {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.stars {
    color: #fbbf24;
    font-size: 16px;
    letter-spacing: 2px;
}

.rating-text {
    color: var(--courses-text-light);
    font-size: 14px;
    font-weight: 500;
}

.course-features {
    list-style: none;
    padding: 0;
    margin: 0 0 20px 0;
}

.course-features li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 0;
    color: var(--courses-text-light);
    font-size: 14px;
    line-height: 1.5;
}

.course-features li i {
    color: var(--courses-success);
    font-size: 16px;
    margin-top: 2px;
    flex-shrink: 0;
}

.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--courses-border);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--courses-text-light);
    font-size: 13px;
    font-weight: 500;
}

.meta-item i {
    font-size: 14px;
    color: var(--courses-primary);
}

/* Course CTA */
.course-cta {
    margin-top: auto;
}

.course-cta-btn {
    width: 100%;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--courses-primary) 0%, var(--courses-secondary) 100%);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--courses-transition);
    cursor: pointer;
}

.course-cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    color: var(--white);
}

.course-cta-btn i {
    font-size: 18px;
    transition: var(--courses-transition);
}

.course-cta-btn:hover i {
    transform: translateX(4px);
}

/* ============================================
   NO RESULTS
   ============================================ */

.no-results {
    text-align: center;
    padding: 60px 20px;
}

.no-results-icon {
    font-size: 64px;
    color: var(--courses-text-light);
    margin-bottom: 20px;
    opacity: 0.5;
}

.no-results h3 {
    font-size: 24px;
    color: var(--courses-text-dark);
    margin-bottom: 12px;
}

.no-results p {
    color: var(--courses-text-light);
    margin-bottom: 24px;
}

/* ============================================
   CTA SECTION
   ============================================ */

.courses-cta-section {
    background: linear-gradient(135deg, var(--courses-primary) 0%, var(--courses-secondary) 100%);
    color: var(--white);
    padding: 60px 0;
    margin-top: 60px;
}

.cta-content {
    text-align: center;
}

.cta-content h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
}

.cta-content p {
    font-size: 18px;
    margin-bottom: 32px;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
}

.cta-buttons .btn {
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.cta-buttons .btn-lg {
    padding: 16px 40px;
    font-size: 18px;
}

/* ============================================
   MOBILE FILTER BUTTON
   ============================================ */

.mobile-filter-btn {
    position: fixed;
    bottom: 100px;
    right: 20px;
    z-index: 1000;
    background: linear-gradient(135deg, var(--courses-primary) 0%, var(--courses-secondary) 100%);
    color: var(--white);
    border: none;
    border-radius: 50px;
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 600;
    box-shadow: var(--courses-shadow-lg);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--courses-transition);
}

.mobile-filter-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
    color: var(--white);
}

.mobile-filter-btn i {
    font-size: 20px;
}

/* ============================================
   MOBILE BOTTOM SHEET
   ============================================ */

.mobile-bottom-sheet {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-bottom-sheet.active {
    pointer-events: all;
    opacity: 1;
}

.bottom-sheet-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.bottom-sheet-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-radius: 24px 24px 0 0;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
}

.mobile-bottom-sheet.active .bottom-sheet-content {
    transform: translateY(0);
}

.bottom-sheet-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--courses-border);
}

.bottom-sheet-header h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--courses-text-dark);
    margin: 0;
}

.bottom-sheet-close {
    background: transparent;
    border: none;
    font-size: 24px;
    color: var(--courses-text-light);
    cursor: pointer;
    padding: 4px;
    transition: var(--courses-transition);
}

.bottom-sheet-close:hover {
    color: var(--courses-primary);
}

.bottom-sheet-body {
    flex: 1;
    overflow-y: auto;
    padding: 16px 24px 24px;
}

.category-list-mobile {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-list-mobile li {
    margin-bottom: 8px;
}

.category-link-mobile {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: space-between;
    padding: 16px 20px;
    color: var(--courses-text-dark);
    text-decoration: none;
    border-radius: 12px;
    transition: var(--courses-transition);
    font-size: 16px;
    font-weight: 500;
    border: 2px solid transparent;
}

.category-link-mobile:hover,
.category-link-mobile.active {
    background: linear-gradient(135deg, var(--courses-primary) 0%, var(--courses-secondary) 100%);
    color: var(--white);
    border-color: transparent;
}

.category-link-mobile.active .category-count,
.category-link-mobile:hover .category-count {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

/* ============================================
   MOBILE BOTTOM ACTION BAR
   ============================================ */

.mobile-bottom-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-top: 1px solid var(--courses-border);
    padding: 12px 0;
    display: flex;
    justify-content: space-around;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 999;
}

.action-bar-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
    color: var(--courses-text-light);
    text-decoration: none;
    border: none;
    background: transparent;
    font-size: 12px;
    font-weight: 500;
    transition: var(--courses-transition);
    cursor: pointer;
}

.action-bar-btn i {
    font-size: 24px;
}

.action-bar-btn:hover,
.action-bar-btn:active {
    color: var(--courses-primary);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet */
@media (min-width: 768px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .courses-listing-section {
        padding: 60px 0;
    }
    
    #coursesTitle {
        font-size: 36px;
    }
}

/* Desktop */
@media (min-width: 1024px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .courses-listing-section {
        padding: 80px 0;
    }
    
    .mobile-filter-btn,
    .mobile-bottom-bar {
        display: none;
    }
}

/* Large Desktop */
@media (min-width: 1200px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Staggered Animation Delay */
.course-card-modern[data-index="0"] { animation-delay: 0.05s; }
.course-card-modern[data-index="1"] { animation-delay: 0.1s; }
.course-card-modern[data-index="2"] { animation-delay: 0.15s; }
.course-card-modern[data-index="3"] { animation-delay: 0.2s; }
.course-card-modern[data-index="4"] { animation-delay: 0.25s; }
.course-card-modern[data-index="5"] { animation-delay: 0.3s; }
.course-card-modern[data-index="6"] { animation-delay: 0.35s; }
.course-card-modern[data-index="7"] { animation-delay: 0.4s; }
.course-card-modern[data-index="8"] { animation-delay: 0.45s; }
.course-card-modern[data-index="9"] { animation-delay: 0.5s; }