/* ========================================
   MODERN CSS VARIABLES & ROOT STYLES
======================================== */

:root {
    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --accent-primary: #0d6efd;
    --accent-secondary: #6f42c1;
    --accent-success: #198754;
    --accent-warning: #fd7e14;
    --accent-danger: #dc3545;
    --border-color: #dee2e6;
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    
    /* Gradient Colors */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    
    /* Spacing */
    --navbar-height: 70px;
    --sidebar-width: 280px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    /* Typography */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Transitions */
    --transition-fast: all 0.2s ease;
    --transition-normal: all 0.3s ease;
    --transition-slow: all 0.5s ease;
}

/* Dark Theme Colors */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --text-muted: #b0b0b0;
    --border-color: #404040;
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.3);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.5);
}

/* ========================================
   BASE STYLES
======================================== */

* {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    transition: var(--transition-normal);
    min-height: 100vh;
    padding-top: var(--navbar-height);
}

/* ========================================
   NAVIGATION STYLES
======================================== */

.navbar {
    background: var(--gradient-primary) !important;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    height: var(--navbar-height);
    transition: var(--transition-normal);
}

.navbar-brand {
    font-weight: var(--font-weight-bold);
    font-size: 1.5rem;
    text-decoration: none;
    transition: var(--transition-fast);
}

.navbar-brand:hover {
    transform: translateY(-2px);
}

.navbar-nav .nav-link {
    font-weight: var(--font-weight-medium);
    transition: var(--transition-fast);
    border-radius: var(--border-radius-sm);
    margin: 0 4px;
    position: relative;
}

.navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: rgba(255, 255, 255, 0.8);
    transition: var(--transition-fast);
    transform: translateX(-50%);
}

.navbar-nav .nav-link:hover::after {
    width: 80%;
}

/* Theme Toggle Button */
#theme-toggle {
    border: 2px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition-fast);
}

#theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: scale(1.1);
}

/* ========================================
   MAIN CONTENT STYLES
======================================== */

.main-content {
    padding-top: 2rem;
    min-height: calc(100vh - var(--navbar-height));
}

/* Breadcrumb Navigation */
.breadcrumb-nav {
    margin-bottom: 1.5rem;
}

.breadcrumb {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    margin-bottom: 0;
    box-shadow: var(--shadow-sm);
}

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

.breadcrumb-item a:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

/* Search Container */
.search-container {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-bar {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.search-bar:focus-within {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.search-bar .input-group-text {
    background-color: var(--bg-primary);
    border-color: var(--border-color);
}

.search-bar .form-control {
    border-color: var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1.1rem;
    padding: 0.875rem 1rem;
}

.search-bar .form-control:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

/* Search Results */
#search-results {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

#search-results ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

#search-results li {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-fast);
    cursor: pointer;
}

#search-results li:last-child {
    border-bottom: none;
}

#search-results li:hover {
    background: var(--bg-secondary);
    color: var(--accent-primary);
    transform: translateX(8px);
}

/* ========================================
   CARD STYLES
======================================== */

.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    background: var(--bg-primary);
    transition: var(--transition-normal);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    background: var(--gradient-primary);
    color: white;
    font-weight: var(--font-weight-semibold);
    border-bottom: none;
    padding: 1rem 1.25rem;
}

.card-body {
    padding: 1.5rem;
}

/* Content Display Area */
.content-display {
    min-height: 400px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
}

.content-display .card-body {
    padding: 2rem;
}

/* ========================================
   CODE BLOCK STYLES
======================================== */

.code-block-wrapper {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.code-block-wrapper:hover {
    box-shadow: var(--shadow-md);
}

.code-block-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.code-block-title {
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.code-actions {
    display: flex;
    gap: 0.5rem;
}

.code-actions .btn {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
}

.code-actions .btn:hover {
    transform: translateY(-2px);
}

/* Code Block States */
pre {
    margin: 0;
    padding: 1.5rem;
    background: var(--bg-tertiary) !important;
    border-radius: 0;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-primary);
    overflow-x: auto;
    transition: var(--transition-normal);
}

pre.collapsed {
    max-height: 120px;
    overflow: hidden;
    position: relative;
}

pre.collapsed::after {
    content: "Show more...";
    position: absolute;
    bottom: 0;
    right: 0;
    background: linear-gradient(to right, transparent, var(--bg-tertiary));
    color: var(--accent-primary);
    cursor: pointer;
    padding: 0.5rem;
    font-weight: var(--font-weight-medium);
}

/* ========================================
   TREE VIEW STYLES
======================================== */

.tree-view {
    list-style-type: none;
    padding-left: 0;
    margin: 0;
}

.tree-view ul {
    list-style-type: none;
    padding-left: 1.5rem;
    margin: 0.5rem 0;
}

.tree-view li {
    position: relative;
    padding: 0.5rem 0;
    cursor: pointer;
    transition: var(--transition-fast);
    border-radius: var(--border-radius-sm);
    padding-left: 2rem;
    margin-bottom: 0.25rem;
}

.tree-view li:hover {
    background: var(--bg-secondary);
    color: var(--accent-primary);
    transform: translateX(4px);
}

.tree-view .folder::before,
.tree-view .file::before {
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    position: absolute;
    left: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    transition: var(--transition-fast);
}

.tree-view .folder::before {
    content: '\f07b';
    color: var(--accent-warning);
}

.tree-view .folder.expanded::before {
    content: '\f07c';
    color: var(--accent-success);
}

.tree-view .file::before {
    content: '\f15b';
    color: var(--accent-primary);
}

/* ========================================
   GLOBAL BUTTONS STYLES
======================================== */

.global-buttons {
    display: flex;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.global-buttons .btn {
    border-radius: var(--border-radius);
    font-weight: var(--font-weight-medium);
    transition: var(--transition-fast);
    padding: 0.5rem 1rem;
}

.global-buttons .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   MARKDOWN CONTENT STYLES
======================================== */

.markdown-content {
    line-height: 1.8;
    color: var(--text-primary);
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
    margin-top: 2rem;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.markdown-content h1 {
    font-size: 2.5rem;
    border-bottom: 2px solid var(--accent-primary);
    padding-bottom: 0.5rem;
}

.markdown-content h2 {
    font-size: 2rem;
    color: var(--accent-primary);
}

.markdown-content h3 {
    font-size: 1.75rem;
    color: var(--accent-secondary);
}

.markdown-content p {
    margin-bottom: 1.5rem;
    text-align: justify;
}

.markdown-content ul,
.markdown-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

.markdown-content li {
    margin-bottom: 0.5rem;
}

.markdown-content blockquote {
    border-left: 4px solid var(--accent-primary);
    background: var(--bg-secondary);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    font-style: italic;
}

.markdown-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 2rem auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.markdown-content img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.markdown-content th,
.markdown-content td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.markdown-content th {
    background: var(--bg-secondary);
    font-weight: var(--font-weight-semibold);
}

.markdown-content tr:hover {
    background: var(--bg-secondary);
}

/* ========================================
   LOADING SPINNER STYLES
======================================== */

#loading-spinner {
    background: rgba(var(--bg-primary), 0.95);
    backdrop-filter: blur(5px);
}

.spinner-border {
    width: 3rem;
    height: 3rem;
}

/* ========================================
   SCROLL TO TOP BUTTON
======================================== */

#scroll-to-top {
    background: var(--gradient-primary);
    border: none;
    transition: var(--transition-normal);
}

#scroll-to-top:hover {
    transform: scale(1.1) translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   UTILITY CLASSES
======================================== */

.bg-gradient-primary {
    background: var(--gradient-primary) !important;
}

.bg-gradient-secondary {
    background: var(--gradient-secondary) !important;
}

.bg-gradient-success {
    background: var(--gradient-success) !important;
}

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.shadow-hover {
    transition: var(--transition-normal);
}

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

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

/* Tablet Styles */
@media (max-width: 992px) {
    :root {
        --navbar-height: 65px;
        --sidebar-width: 250px;
    }
    
    .main-content {
        padding: 1.5rem;
    }
    
    .search-container {
        max-width: 100%;
    }
    
    .global-buttons {
        justify-content: center;
    }
    
    .markdown-content h1 {
        font-size: 2rem;
    }
    
    .markdown-content h2 {
        font-size: 1.75rem;
    }
    
    .markdown-content h3 {
        font-size: 1.5rem;
    }
}

/* Mobile Styles */
@media (max-width: 768px) {
    :root {
        --navbar-height: 60px;
    }
    
    body {
        font-size: 14px;
    }
    
    .main-content {
        padding: 1rem;
        padding-top: 1.5rem;
    }
    
    .navbar-brand {
        font-size: 1.25rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .code-actions {
        flex-wrap: wrap;
        gap: 0.25rem;
    }
    
    .code-actions .btn {
        font-size: 0.7rem;
        padding: 0.2rem 0.4rem;
    }
    
    .global-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .global-buttons .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .tree-view li {
        font-size: 0.9rem;
    }
    
    .markdown-content {
        font-size: 0.95rem;
    }
    
    .markdown-content h1 {
        font-size: 1.75rem;
    }
    
    .markdown-content h2 {
        font-size: 1.5rem;
    }
    
    .markdown-content h3 {
        font-size: 1.25rem;
    }
}

/* Small Mobile Styles */
@media (max-width: 576px) {
    .main-content {
        padding: 0.75rem;
    }
    
    .breadcrumb {
        padding: 0.5rem 0.75rem;
        font-size: 0.875rem;
    }
    
    .search-bar .form-control {
        font-size: 1rem;
        padding: 0.75rem;
    }
    
    #scroll-to-top {
        width: 40px;
        height: 40px;
        bottom: 15px;
        right: 15px;
    }
    
    .code-block-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .code-actions {
        align-self: stretch;
        justify-content: space-between;
    }
    
    .markdown-content p {
        text-align: left;
    }
}

/* ========================================
   VISIBILITY UTILITIES
======================================== */

.search-bar,
#cards-container,
#search-results,
#tree-view-container {
    display: none;
}

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

.slide-in-up {
    animation: slideInUp 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Focus Styles for Accessibility */
.btn:focus,
.form-control:focus,
.nav-link:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
        --text-secondary: #ffffff;
    }
}

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