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

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --text-color: #333;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --border-color: #e0e0e0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

[data-theme="dark"] {
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --border-color: #334155;
    --border-light: #475569;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    transition: all 0.3s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

.mobile-menu-btn {
    display: none;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.mobile-menu-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Main Container */
.main-container {
    display: flex;
    min-height: calc(100vh - 80px);
    gap: 0;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem 0;
    position: sticky;
    top: 80px;
    height: calc(100vh - 80px);
    overflow-y: auto;
    transition: all 0.3s ease;
}

.search-container {
    padding: 0 1.5rem;
    margin-bottom: 1.5rem;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: 1rem;
    color: var(--text-muted);
    z-index: 1;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

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

.clear-search {
    position: absolute;
    right: 0.75rem;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    opacity: 0;
    transition: all 0.3s ease;
}

.search-box:hover .clear-search,
.search-box input:not(:placeholder-shown) + .clear-search {
    opacity: 1;
}

.clear-search:hover {
    color: var(--text-secondary);
    background: var(--bg-tertiary);
}

/* Navigation */
.nav-list {
    list-style: none;
    padding: 0 1rem;
}

.nav-item {
    margin-bottom: 0.25rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
    position: relative;
}

.nav-link:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateX(4px);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-weight: 500;
    box-shadow: var(--shadow-md);
}

.nav-link i {
    font-size: 1.125rem;
    width: 20px;
    flex-shrink: 0;
}

.nav-link span:first-of-type {
    flex: 1;
    font-size: 0.875rem;
}

.question-count {
    background: rgba(255, 255, 255, 0.2);
    color: inherit;
    padding: 0.125rem 0.5rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 1.5rem;
    text-align: center;
}

.nav-link:not(.active) .question-count {
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

/* Sidebar Footer */
.sidebar-footer {
    margin-top: auto;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.stats {
    display: flex;
    gap: 1rem;
}

.stat-item {
    flex: 1;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    background: var(--bg-secondary);
}

.content-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.content-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.content-actions {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.expand-all-btn,
.collapse-all-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.expand-all-btn:hover,
.collapse-all-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.progress-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    width: 0%;
    transition: width 0.5s ease;
    border-radius: 3px;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    min-width: 80px;
}

/* Content Sections */
.content-section {
    display: none;
}

.content-section.active {
    display: block;
    animation: fadeInUp 0.5s ease;
}

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

/* Question Cards */
.questions-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.question-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid var(--border-light);
}

.question-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--border-color);
}

.question-header {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-bottom: 1px solid var(--border-light);
    transition: all 0.3s ease;
    position: relative;
}

.question-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.question-card.active .question-header::before {
    opacity: 1;
}

.question-header:hover {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--border-color) 100%);
}

.question-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
    line-height: 1.4;
}

.question-header i {
    color: var(--text-muted);
    transition: all 0.3s ease;
    font-size: 1rem;
    margin-left: 1rem;
}

.question-card.active .question-header i {
    transform: rotate(180deg);
    color: var(--primary-color);
}

.question-content {
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.4s ease;
    background: var(--bg-primary);
}

.question-card.active .question-content {
    padding: 1.5rem;
    max-height: 2000px;
}

.question-content p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.question-content p:last-child {
    margin-bottom: 0;
}

.question-content ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.question-content li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.question-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Comparison Tables */
.comparison-table {
    margin: 1rem 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.table-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.table-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-top: 1px solid var(--border-color);
}

.table-row:nth-child(even) {
    background: var(--bg-secondary);
}

.table-cell {
    padding: 1rem;
    border-right: 1px solid var(--border-color);
    font-size: 0.875rem;
    line-height: 1.5;
}

.table-cell:last-child {
    border-right: none;
}

.table-header .table-cell {
    font-weight: 600;
    border-right: 1px solid rgba(255, 255, 255, 0.2);
}

/* Code Blocks */
.code-block {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin: 1rem 0;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    overflow-x: auto;
}

.code-block code {
    color: var(--text-primary);
    font-size: 0.875rem;
    line-height: 1.5;
}

/* Search Results Highlighting */
.highlight {
    background: linear-gradient(120deg, #fef3c7 0%, #fde68a 100%);
    padding: 0.125rem 0.25rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        width: 280px;
    }
    
    .main-content {
        padding: 1.5rem;
    }
    
    .content-header h2 {
        font-size: 1.75rem;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .main-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: fixed;
        top: 80px;
        left: -100%;
        z-index: 999;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-xl);
        max-height: calc(100vh - 80px);
    }

    .sidebar.active {
        left: 0;
    }

    .main-content {
        padding: 1rem;
        width: 100%;
    }

    .content-header h2 {
        font-size: 1.5rem;
    }

    .content-actions {
        flex-wrap: wrap;
    }

    .expand-all-btn,
    .collapse-all-btn {
        flex: 1;
        min-width: 120px;
        justify-content: center;
    }

    .progress-container {
        flex-direction: column;
        gap: 0.5rem;
        align-items: stretch;
    }

    .progress-text {
        text-align: center;
        min-width: auto;
    }

    .question-header {
        padding: 1rem;
    }

    .question-header h3 {
        font-size: 1rem;
    }

    .question-card.active .question-content {
        padding: 1rem;
    }

    .nav-link {
        padding: 0.75rem;
    }

    .nav-link span:first-of-type {
        font-size: 0.8rem;
    }

    .table-header,
    .table-row {
        grid-template-columns: 1fr;
    }

    .table-cell {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .table-cell:last-child {
        border-bottom: none;
    }

    .stats {
        justify-content: space-around;
    }

    .stat-number {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .main-content {
        padding: 0.75rem;
    }

    .question-header {
        padding: 0.75rem;
    }

    .question-header h3 {
        font-size: 0.9rem;
    }

    .question-card.active .question-content {
        padding: 0.75rem;
    }

    .search-container {
        padding: 0 1rem;
    }

    .nav-list {
        padding: 0 0.5rem;
    }

    .sidebar-footer {
        padding: 1rem;
    }

    .logo {
        font-size: 1.25rem;
    }
}

/* Scrollbar Styling */
.sidebar::-webkit-scrollbar,
.main-content::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track,
.main-content::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

.sidebar::-webkit-scrollbar-thumb,
.main-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover,
.main-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Focus States for Accessibility */
.nav-link:focus,
.question-header:focus,
.search-box input:focus,
.theme-toggle:focus,
.mobile-menu-btn:focus,
.expand-all-btn:focus,
.collapse-all-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .sidebar,
    .header,
    .content-actions {
        display: none !important;
    }
    
    .main-content {
        padding: 0 !important;
        background: white !important;
    }
    
    .question-card {
        break-inside: avoid;
        box-shadow: none !important;
        border: 1px solid #ccc !important;
        margin-bottom: 1rem !important;
    }
    
    .question-content {
        max-height: none !important;
        padding: 1rem !important;
    }
    
    .question-card.active .question-content {
        display: block !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
        --bg-secondary: #ffffff;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Custom Animations */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(-25%);
        animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
    }
    50% {
        transform: translateY(0);
        animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
    }
}

.bounce {
    animation: bounce 1s infinite;
}


/* Import Work Sans font */
@import url("https://fonts.googleapis.com/css2?family=Work+Sans&display=swap");

/* Footer styles */
footer {
  text-align: center;
  padding: 20px;
  border-top: 1px solid var(--border-color);
  font-size: 14px;
  color: var(--text-color);
  opacity: 0.7;
}

/* Gowthamraj font */
.gowthamraj {
  font-family: "Work Sans", sans-serif;
  font-weight: 600;
}