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

body {
    font-family: 'Cairo', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 2rem 1rem;
    text-align: center;
}

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

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.logo i {
    font-size: 3rem;
    color: #fff;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 300;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem 1rem;
}

/* Search Section */
.search-section {
    margin-bottom: 3rem;
}

.search-container {
    max-width: 600px;
    margin: 0 auto;
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 50px;
    padding: 0.5rem 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.search-input-wrapper:focus-within {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.search-icon {
    color: #667eea;
    font-size: 1.2rem;
    margin-left: 1rem;
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    padding: 1rem 0;
    font-size: 1.1rem;
    font-family: 'Cairo', sans-serif;
    background: transparent;
    color: #333;
}

.search-input::placeholder {
    color: #999;
}

.clear-btn {
    background: none;
    border: none;
    color: #999;
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.clear-btn:hover {
    background: rgba(0, 0, 0, 0.1);
    color: #667eea;
}

/* Results Section */
.results-section {
    max-width: 800px;
    margin: 0 auto;
}

.search-results {
    display: grid;
    gap: 1.5rem;
}

.course-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.course-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1rem;
    gap: 1rem;
}

.course-title {
    flex: 1;
}

.course-title h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 0.5rem;
}

.course-codes {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.code-badge {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 2px 10px rgba(102, 126, 234, 0.3);
}

.telegram-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: #0088cc;
    color: white;
    text-decoration: none;
    padding: 0.7rem 1.2rem;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 3px 15px rgba(0, 136, 204, 0.3);
}

.telegram-link:hover {
    background: #006699;
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0, 136, 204, 0.4);
}

.telegram-link i {
    font-size: 1.1rem;
}

/* Messages */
.no-results,
.initial-message {
    text-align: center;
    padding: 3rem 1rem;
    color: rgba(255, 255, 255, 0.9);
}

.no-results i,
.initial-message i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

.no-results h3,
.initial-message h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.no-results p,
.initial-message p {
    font-size: 1.1rem;
    opacity: 0.8;
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.2);
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
    padding: 1.5rem;
    margin-top: auto;
}

/* Mobile Menu Styles */
#mobileMenu {
    transition: transform 0.3s ease-in-out;
}

#mobileMenu.open {
    transform: translateX(0);
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 40;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-menu-overlay.show {
    opacity: 1;
    visibility: visible;
}

/* Add Subject Modal Styles */
.resource-item {
    animation: slideInUp 0.3s ease;
}

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

/* Success/Error Message Styles */
.message-container {
    animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .logo {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .search-input-wrapper {
        padding: 0.3rem 1rem;
    }
    
    .search-input {
        padding: 0.8rem 0;
        font-size: 1rem;
    }
    
    .course-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .course-codes {
        margin-bottom: 1rem;
    }
    
    .telegram-link {
        align-self: flex-start;
    }
    
    .mobile-menu-btn:hover {
        background: rgba(109, 99, 255, 0.1);
    }
    
    .add-subject-btn {
        padding: 8px 12px;
        font-size: 14px;
    }
    
    .add-subject-btn span {
        display: none;
    }
    
    .resource-item {
        flex-direction: column;
        gap: 10px;
    }
    
    .resource-item > * {
        width: 100%;
    }
}

/* Enhanced Mobile Optimizations */

/* Touch-friendly interactions */
@media (max-width: 768px) {
    /* Increase touch targets */
    button, a, input, select, textarea {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* Mobile typography */
    h1 { font-size: 2rem !important; }
    h2 { font-size: 1.75rem !important; }
    h3 { font-size: 1.5rem !important; }
    h4 { font-size: 1.25rem !important; }
    
    /* Mobile spacing */
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    /* Mobile cards */
    .course-card {
        min-height: auto;
        padding: 1rem !important;
    }
    
    /* Mobile forms */
    .resource-item .grid {
        gap: 0.75rem;
        grid-template-columns: 1fr;
    }
    
    .resource-item select,
    .resource-item input,
    .resource-item button {
        width: 100%;
    }
    
    /* Mobile search */
    .input-wrapper {
        max-width: 100%;
    }
    
    /* Mobile menu animations */
    #mobileMenu {
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    /* Sticky mobile elements */
    .mobile-sticky-bottom {
        position: sticky;
        bottom: 0;
        background: rgba(15, 15, 26, 0.95);
        backdrop-filter: blur(10px);
        border-top: 1px solid rgba(109, 99, 255, 0.2);
        padding: 1rem;
        margin: -1rem;
        margin-top: 1rem;
    }
    
    /* Mobile modal improvements */
    .modal-mobile {
        padding: 0;
        margin: 0;
        height: 100vh;
        max-height: 100vh;
        border-radius: 0;
    }
    
    /* Mobile scroll improvements */
    .mobile-scroll {
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
    }
    
    /* Mobile hero adjustments */
    .hero-mobile-padding {
        padding-top: 2rem;
        padding-bottom: 2rem;
    }
    
    /* Mobile navigation improvements */
    .nav-mobile-spacing {
        margin-bottom: 1rem;
    }
    
    /* Mobile search quick actions */
    .quick-search-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        margin-top: 0.75rem;
    }
    
    .quick-search-tag {
        padding: 0.25rem 0.75rem;
        font-size: 0.75rem;
        border-radius: 9999px;
        background: rgba(45, 45, 77, 0.4);
        color: rgba(224, 224, 255, 0.8);
        border: 1px solid rgba(109, 99, 255, 0.3);
        transition: all 0.2s ease;
    }
    
    .quick-search-tag:hover {
        background: rgba(45, 45, 77, 0.6);
        color: white;
        border-color: rgba(109, 99, 255, 0.5);
    }
}

/* Mobile-specific optimizations and enhancements */
@media (max-width: 768px) {
    /* Improved touch targets */
    button, .cta-button, .gradient-bg {
        min-height: 48px;
        min-width: 48px;
        padding: 12px 20px;
        font-size: 16px; /* Prevents zoom on iOS */
    }
    
    /* Enhanced mobile search */
    #courseSearchMobile {
        font-size: 16px; /* Prevents zoom on iOS */
        line-height: 1.5;
        padding: 12px 16px 12px 40px;
        border-radius: 12px;
    }
    
    /* Better mobile course cards - override desktop styles */
    .course-card {
        margin-bottom: 16px !important;
        padding: 20px !important;
        border-radius: 16px !important;
        transform: none !important; /* Disable hover transforms on mobile */
    }
    
    .course-card h3, .course-card h4 {
        font-size: 18px;
        line-height: 1.4;
        margin-bottom: 8px;
    }
    
    .course-card p {
        font-size: 14px;
        line-height: 1.5;
        margin-bottom: 12px;
    }
    
    /* Mobile-optimized buttons within cards */
    .course-card button {
        width: 100%;
        padding: 12px 16px;
        font-size: 14px;
        border-radius: 8px;
        margin-top: 8px;
    }
    
    /* Quick search buttons */
    .bg-nebula\/40 {
        padding: 8px 12px;
        font-size: 12px;
        min-height: 36px;
        border-radius: 18px;
        margin: 2px;
    }
    
    /* Mobile menu improvements */
    #mobileMenu {
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    #mobileMenu button, #mobileMenu a {
        padding: 16px;
        font-size: 16px;
        min-height: 56px;
        border-radius: 12px;
        margin-bottom: 4px;
    }
    
    /* Hero section mobile optimization */
    .hero-gradient {
        padding: 40px 16px;
    }
    
    .hero-gradient h1 {
        font-size: 28px;
        line-height: 1.3;
        margin-bottom: 16px;
    }
    
    .hero-gradient p {
        font-size: 16px;
        line-height: 1.6;
        margin-bottom: 24px;
    }
    
    /* Glass cards on mobile */
    .glass-card {
        padding: 16px;
        border-radius: 12px;
        margin-bottom: 12px;
    }
    
    /* Navigation improvements */
    .nav-link {
        padding: 12px 16px;
        font-size: 16px;
        border-radius: 8px;
    }
    
    /* Search message mobile optimization */
    #searchMessage {
        top: 80px !important;
        right: 8px !important;
        left: 8px !important;
        padding: 16px;
        font-size: 14px;
        border-radius: 12px;
    }
    
    /* Level badges mobile */
    .level-badge {
        font-size: 10px;
        padding: 4px 8px;
        top: 12px;
        left: 12px;
    }
    
    /* Floating animations - reduce on mobile for performance */
    .floating {
        animation: none;
    }
    
    /* Scroll behavior improvements */
    html {
        scroll-behavior: smooth;
        -webkit-text-size-adjust: 100%;
    }
    
    /* Fix for iOS safe area */
    @supports (padding: max(0px)) {
        .header, #mobileMenu {
            padding-top: max(16px, env(safe-area-inset-top));
        }
        
        .main-content {
            padding-bottom: max(16px, env(safe-area-inset-bottom));
        }
    }
    
    /* Improved tap highlighting */
    button, a, .course-card {
        -webkit-tap-highlight-color: rgba(108, 99, 255, 0.2);
    }
    
    /* Better focus styles for accessibility */
    input:focus, button:focus, a:focus {
        outline: 2px solid #6C63FF;
        outline-offset: 2px;
    }
    
    /* Optimized animations for mobile */
    *, *::before, *::after {
        animation-duration: 0.3s !important;
        transition-duration: 0.3s !important;
    }
    
    /* Mobile typography improvements */
    h1, h2, h3, h4, h5, h6 {
        word-wrap: break-word;
        hyphens: auto;
    }
    
    /* Mobile container spacing */
    .container {
        padding: 0 16px;
        max-width: 100%;
    }
    
    /* Section spacing on mobile */
    section {
        margin-bottom: 32px;
    }
    
    /* Grid improvements for mobile */
    .grid {
        gap: 16px;
    }
    
    /* Mobile-specific utilities */
    .mobile-only {
        display: block !important;
    }
    
    .desktop-only {
        display: none !important;
    }
}

/* Landscape mobile improvements */
@media (max-width: 768px) and (orientation: landscape) {
    .hero-gradient {
        padding: 24px 16px;
    }
    
    .hero-gradient h1 {
        font-size: 24px;
    }
    
    #mobileMenu {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
}

/* Very small screens */
@media (max-width: 480px) {
    .course-card {
        padding: 16px;
    }
    
    .hero-gradient h1 {
        font-size: 24px;
    }
    
    .hero-gradient p {
        font-size: 14px;
    }
    
    button, .cta-button, .gradient-bg {
        padding: 10px 16px;
        font-size: 14px;
    }
}

/* High DPI screens */
@media (-webkit-min-device-pixel-ratio: 2) {
    .glass-card, .course-card {
        border-width: 0.5px;
    }
}

/* Dark mode optimizations for mobile */
@media (max-width: 768px) {
    body.light-mode .course-card {
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }
    
    body.light-mode .glass-card {
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    }
    
    body.light-mode #searchMessage {
        background: rgba(255, 255, 255, 0.95);
        color: #1a202c;
        border-color: rgba(99, 102, 241, 0.2);
    }
}

/* Performance optimizations for mobile */
@media (max-width: 768px) {
    /* Reduce will-change usage on mobile */
    .course-card, .glass-card {
        will-change: auto;
    }
    
    /* Simplified backgrounds on mobile */
    .pattern-overlay {
        background-image: none;
    }
    
    /* Reduce blur effects on lower-end devices */
    @media (max-resolution: 150dpi) {
        .backdrop-blur-lg, .glass-card {
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }
    }
}

/* Animation for results */
.course-card {
    animation: fadeInUp 0.5s ease forwards;
    opacity: 0;
    transform: translateY(20px);
}

.course-card:nth-child(1) { animation-delay: 0.1s; }
.course-card:nth-child(2) { animation-delay: 0.2s; }
.course-card:nth-child(3) { animation-delay: 0.3s; }
.course-card:nth-child(4) { animation-delay: 0.4s; }
.course-card:nth-child(5) { animation-delay: 0.5s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading animation */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    color: rgba(255, 255, 255, 0.8);
}

.loading i {
    font-size: 2rem;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Additional mobile-specific CSS fixes */
@media (max-width: 768px) {
    /* Fix search button functionality */
    .mobile-search-btn {
        background: linear-gradient(135deg, #6C63FF 0%, #4D44DB 100%);
        color: white;
        border: none;
        border-radius: 12px;
        padding: 12px;
        min-width: 48px;
        min-height: 48px;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all 0.3s ease;
        cursor: pointer;
    }
    
    .mobile-search-btn:hover {
        background: linear-gradient(135deg, #4D44DB 0%, #3730A3 100%);
        transform: translateY(-1px);
    }
    
    /* Enhanced mobile modal */
    #addSubjectModal .glass-card {
        margin: 8px;
        max-height: calc(100vh - 16px);
        width: calc(100% - 16px);
    }
    
    /* Better mobile form styling */
    #addSubjectForm input,
    #addSubjectForm textarea,
    #addSubjectForm select {
        font-size: 16px; /* Prevent zoom on iOS */
        line-height: 1.5;
        min-height: 44px;
    }
    
    /* Mobile-optimized touch targets */
    .touch-target {
        min-height: 44px;
        min-width: 44px;
        padding: 12px;
    }
    
    /* Improved mobile course cards */
    .course-card {
        padding: 20px !important;
        margin-bottom: 16px !important;
        border-radius: 16px !important;
    }
    
    .course-card h3 {
        font-size: 20px !important;
        margin-bottom: 8px !important;
    }
    
    .course-card h4 {
        font-size: 18px !important;
        margin-bottom: 12px !important;
    }
    
    .course-card p {
        font-size: 14px !important;
        line-height: 1.6 !important;
        margin-bottom: 16px !important;
    }
    
    /* Mobile navigation enhancements */
    #mobileMenu a, #mobileMenu button {
        padding: 16px !important;
        font-size: 16px !important;
        line-height: 1.5 !important;
        border-radius: 12px !important;
    }
    
    /* Performance optimizations for mobile */
    * {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    
    /* Mobile scrolling improvements */
    html {
        -webkit-overflow-scrolling: touch;
        scroll-behavior: smooth;
    }
    
    /* Better mobile focus states */
    input:focus,
    textarea:focus,
    select:focus,
    button:focus {
        outline: 2px solid #6C63FF;
        outline-offset: 2px;
        box-shadow: 0 0 0 4px rgba(108, 99, 255, 0.1);
    }
}

/* Landscape mobile optimizations */
@media (max-width: 768px) and (orientation: landscape) {
    .hero-gradient {
        padding: 20px 16px !important;
    }
    
    .hero-gradient h1 {
        font-size: 24px !important;
    }
    
    #mobileMenu {
        padding: 8px !important;
    }
}