/* ============================================
   SharpForge
   ============================================ */

/* CSS Custom Properties - Dark Theme (Default) */
:root,
[data-theme="dark"] {
    /* Backgrounds */
    --bg-primary: #1e1e1e;
    --bg-secondary: #252525;
    --bg-tertiary: #2d2d2d;
    --header-bg: rgba(30, 30, 30, 0.95);
    --footer-bg: #1a1a1a;
    --card-bg: #252525;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #a8a8a8;
    --text-tertiary: #6e6e6e;
    
    /* Accent Colors */
    --accent-color: #7B68EE;
    --accent-hover: #8b7cf3;
    --accent-light: rgba(123, 104, 238, 0.1);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #7B68EE 0%, #9945FF 100%);
    --gradient-secondary: linear-gradient(135deg, #6C5CE7 0%, #A29BFE 100%);
    --gradient-hero: linear-gradient(180deg, rgba(123, 104, 238, 0.15) 0%, transparent 50%);
    
    /* Borders & Shadows */
    --border-color: rgba(255, 255, 255, 0.1);
    --hover-bg: rgba(255, 255, 255, 0.05);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    
    /* Code */
    --code-bg: #2d2d2d;
    --code-border: #3d3d3d;
}

/* Light Theme */
[data-theme="light"] {
    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #f1f3f4;
    --header-bg: rgba(255, 255, 255, 0.95);
    --footer-bg: #f8f9fa;
    --card-bg: #ffffff;
    
    /* Text Colors */
    --text-primary: #1a1a1a;
    --text-secondary: #5c5c5c;
    --text-tertiary: #8c8c8c;
    
    /* Accent Colors */
    --accent-color: #6C5CE7;
    --accent-hover: #5b4cdb;
    --accent-light: rgba(108, 92, 231, 0.1);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6C5CE7 0%, #8B7CF3 100%);
    --gradient-secondary: linear-gradient(135deg, #5B4CDB 0%, #8B7CF3 100%);
    --gradient-hero: linear-gradient(180deg, rgba(108, 92, 231, 0.08) 0%, transparent 50%);
    
    /* Borders & Shadows */
    --border-color: rgba(0, 0, 0, 0.08);
    --hover-bg: rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.15);
    
    /* Code */
    --code-bg: #f4f4f4;
    --code-border: #e0e0e0;
}

/* Global Reset & Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin: 0;
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1:focus, h2:focus, h3:focus, h4:focus, h5:focus, h6:focus {
    outline: none;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: 1.25rem;
}

p {
    margin: 0 0 1rem 0;
}

/* Links */
a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-hover);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    color: white;
}

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

.btn-secondary:hover {
    background: var(--hover-bg);
    border-color: var(--text-secondary);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    transition: all 0.3s ease;
}

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

/* Containers */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 5rem 0;
}

/* Code Blocks */
code {
    font-family: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    font-size: 0.875em;
    background: var(--code-bg);
    padding: 0.2em 0.4em;
    border-radius: 0.25rem;
    border: 1px solid var(--code-border);
}

pre {
    background: var(--code-bg) !important;
    border: 1px solid var(--code-border);
    border-radius: 0.75rem;
    padding: 1.5rem !important;
    margin: 1rem 0 !important;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* Custom scrollbar for code blocks */
pre::-webkit-scrollbar {
    height: 8px;
    background: transparent;
}

pre::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
    margin: 0 0.5rem;
}

pre::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: 4px;
}

pre::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Firefox scrollbar */
pre {
    scrollbar-width: thin;
    scrollbar-color: var(--text-tertiary) var(--bg-tertiary);
}

pre code {
    background: none !important;
    border: none;
    padding: 0;
    font-size: 0.875rem;
    line-height: 1.6;
    display: inline-block;
    min-width: 100%;
}

/* Prism.js Overrides */
pre[class*="language-"],
code[class*="language-"] {
    font-family: 'JetBrains Mono', 'Fira Code', Consolas, monospace !important;
    text-shadow: none !important;
}

/* Code block text color - theme dependent */
[data-theme="dark"] pre[class*="language-"],
[data-theme="dark"] code[class*="language-"] {
    color: #d4d4d4 !important;
}

[data-theme="light"] pre[class*="language-"],
[data-theme="light"] code[class*="language-"] {
    color: #393a34 !important;
}

pre[class*="language-"] {
    background: var(--code-bg) !important;
    border: 1px solid var(--code-border);
    border-radius: 0.75rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

pre[class*="language-"] code[class*="language-"] {
    display: inline-block;
    min-width: 100%;
    width: 10vw;
}

:not(pre) > code[class*="language-"] {
    background: var(--code-bg) !important;
    padding: 0.2em 0.4em;
    border-radius: 0.25rem;
}

/* Prism Token Colors - Dark Theme */
[data-theme="dark"] .token.comment,
[data-theme="dark"] .token.prolog,
[data-theme="dark"] .token.doctype,
[data-theme="dark"] .token.cdata {
    color: #6a9955;
}

[data-theme="dark"] .token.punctuation {
    color: #d4d4d4;
}

[data-theme="dark"] .token.property,
[data-theme="dark"] .token.tag,
[data-theme="dark"] .token.boolean,
[data-theme="dark"] .token.number,
[data-theme="dark"] .token.constant,
[data-theme="dark"] .token.symbol {
    color: #b5cea8;
}

[data-theme="dark"] .token.selector,
[data-theme="dark"] .token.attr-name,
[data-theme="dark"] .token.string,
[data-theme="dark"] .token.char,
[data-theme="dark"] .token.builtin {
    color: #ce9178;
}

[data-theme="dark"] .token.operator,
[data-theme="dark"] .token.entity,
[data-theme="dark"] .token.url,
[data-theme="dark"] .token.variable {
    color: #d4d4d4;
}

[data-theme="dark"] .token.atrule,
[data-theme="dark"] .token.attr-value,
[data-theme="dark"] .token.function,
[data-theme="dark"] .token.class-name {
    color: #dcdcaa;
}

[data-theme="dark"] .token.keyword {
    color: #569cd6;
}

[data-theme="dark"] .token.regex,
[data-theme="dark"] .token.important {
    color: #d16969;
}

/* Prism Token Colors - Light Theme */
[data-theme="light"] .token.comment,
[data-theme="light"] .token.prolog,
[data-theme="light"] .token.doctype,
[data-theme="light"] .token.cdata {
    color: #008000;
}

[data-theme="light"] .token.punctuation {
    color: #393a34;
}

[data-theme="light"] .token.property,
[data-theme="light"] .token.tag,
[data-theme="light"] .token.boolean,
[data-theme="light"] .token.number,
[data-theme="light"] .token.constant,
[data-theme="light"] .token.symbol {
    color: #36acaa;
}

[data-theme="light"] .token.selector,
[data-theme="light"] .token.attr-name,
[data-theme="light"] .token.string,
[data-theme="light"] .token.char,
[data-theme="light"] .token.builtin {
    color: #9a050f;
}

[data-theme="light"] .token.operator,
[data-theme="light"] .token.entity,
[data-theme="light"] .token.url,
[data-theme="light"] .token.variable {
    color: #393a34;
}

[data-theme="light"] .token.atrule,
[data-theme="light"] .token.attr-value,
[data-theme="light"] .token.function,
[data-theme="light"] .token.class-name {
    color: #795e26;
}

[data-theme="light"] .token.keyword {
    color: #0000ff;
}

[data-theme="light"] .token.regex,
[data-theme="light"] .token.important {
    color: #ee0000;
}

/* Tags & Badges */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 2rem;
    background: var(--accent-light);
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Form Elements */
input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-light);
}

/* Validation States */
.valid.modified:not([type=checkbox]) {
    outline: 2px solid #22c55e;
    outline-offset: -2px;
}

.invalid {
    outline: 2px solid #ef4444;
    outline-offset: -2px;
}

.validation-message {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Error Boundary */
.blazor-error-boundary {
    background: #ef4444;
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
    border-radius: 0.5rem;
}

.blazor-error-boundary::after {
    content: "An error has occurred.";
}

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

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

.text-muted {
    color: var(--text-secondary);
}

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .section {
        padding: 3rem 0;
    }
}

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

.animate-fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}

/* Focus Styles */
:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background: var(--accent-color);
    color: white;
}

/* ============================================
   Blog Post Styles
   ============================================ */

.blog-post {
    padding-bottom: 4rem;
}

.blog-post .post-header {
    padding: 4rem 0 3rem;
    background: var(--gradient-hero);
}

.blog-post .back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    margin-bottom: 1.5rem;
    transition: color 0.2s ease;
}

.blog-post .back-link:hover {
    color: var(--accent-color);
}

.blog-post .post-header .post-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.blog-post .post-header .post-category {
    padding: 0.25rem 0.75rem;
    background: var(--accent-light);
    color: var(--accent-color);
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.blog-post .post-header .post-date,
.blog-post .post-header .post-read-time {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.blog-post .post-header h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
    max-width: 800px;
}

.blog-post .post-excerpt {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    line-height: 1.6;
    margin: 0;
}

.blog-post .post-content-wrapper {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 3rem;
    padding-top: 3rem;
}

.blog-post .post-body {
    max-width: 100%;
    overflow-x: hidden;
}

.blog-post .post-body h2 {
    font-size: 1.75rem;
    margin: 2.5rem 0 1rem;
    padding-top: 1rem;
}

.blog-post .post-body h3 {
    font-size: 1.25rem;
    margin: 2rem 0 0.75rem;
}

.blog-post .post-body p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.25rem;
}

.blog-post .post-body ul,
.blog-post .post-body ol {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.blog-post .post-body li {
    margin-bottom: 0.5rem;
}

.blog-post .post-body strong {
    color: var(--text-primary);
}

.blog-post .post-body pre {
    margin: 1.5rem 0;
    overflow-x: auto;
}

.blog-post .post-body code {
    font-size: 0.875rem;
}

.blog-post .post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.blog-post .post-tags .tag {
    padding: 0.375rem 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 0.25rem;
    color: var(--text-secondary);
    font-size: 0.8125rem;
}

.blog-post .post-sidebar {
    position: sticky;
    top: 5rem;
    height: fit-content;
}

.blog-post .post-sidebar .sidebar-section {
    background: var(--card-bg);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.blog-post .post-sidebar .sidebar-section h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
}

.blog-post .toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.blog-post .toc li {
    margin-bottom: 0.5rem;
}

.blog-post .toc a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    line-height: 1.5;
    display: block;
    transition: color 0.2s ease;
}

.blog-post .toc a:hover {
    color: var(--accent-color);
}

.blog-post .author-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.blog-post .author-avatar {
    width: 3rem;
    height: 3rem;
    min-width: 3rem;
    min-height: 3rem;
    flex-shrink: 0;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
}

.blog-post .author-info strong {
    display: block;
    font-size: 0.9375rem;
    margin-bottom: 0.25rem;
}

.blog-post .author-info p {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    margin: 0;
}

.table-comparison {
    text-align: left;
    
    td {
        padding-right: 3rem;
    }
}

@media (max-width: 1024px) {
    .blog-post .post-content-wrapper {
        grid-template-columns: 1fr;
    }

    .blog-post .post-sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 1.5rem;
    }

    .blog-post .post-sidebar .sidebar-section {
        margin-bottom: 0;
    }
}

@media (max-width: 768px) {
    .blog-post .post-header {
        padding: 3rem 0 2rem;
    }

    .blog-post .post-excerpt {
        font-size: 1rem;
    }

    .blog-post .post-body h2 {
        font-size: 1.5rem;
    }

    .blog-post .post-body h3 {
        font-size: 1.125rem;
    }

    .blog-post .post-body pre {
        margin-left: -1rem;
        margin-right: -1rem;
        border-radius: 0;
    }
}

/* ============================================
   Lesson Pages - Shared Styles
   ============================================ */

/* Lesson Layout */
.lesson-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: calc(100vh - 4rem);
}

/* Lesson Sidebar */
.lesson-sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem;
    position: sticky;
    top: 4rem;
    height: calc(100vh - 4rem);
    overflow-y: auto;
}

.sidebar-header {
    margin-bottom: 1.5rem;
}

.sidebar-header .back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 0.8125rem;
    margin-bottom: 0.75rem;
    transition: color 0.2s ease;
}

.sidebar-header .back-link:hover {
    color: var(--accent-color);
}

.sidebar-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

/* Lesson Navigation */
.lesson-nav {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.lesson-nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.75rem;
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

.lesson-nav-item:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
}

.lesson-nav-item.active {
    background: var(--accent-light);
    color: var(--accent-color);
}

.lesson-nav-item.completed {
    color: var(--text-tertiary);
}

.lesson-nav-item .lesson-num {
    width: 1.5rem;
    height: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.lesson-nav-item.active .lesson-num {
    background: var(--accent-color);
    color: white;
}

/* Lesson Content */
.lesson-content {
    padding: 2rem 3rem 4rem;
    max-width: 900px;
    margin: 0 auto;
}

.lesson-article {
    max-width: 100%;
}

/* Lesson Header */
.lesson-header {
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.lesson-number {
    display: inline-block;
    font-size: 0.875rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.lesson-header h1 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

.lesson-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.lesson-duration {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.lesson-level {
    padding: 0.25rem 0.75rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.lesson-level.beginner {
    background: rgba(34, 197, 94, 0.15);
    color: #22c55e;
}

.lesson-level.intermediate {
    background: rgba(234, 179, 8, 0.15);
    color: #eab308;
}

.lesson-level.advanced {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

/* Lesson Body */
.lesson-body {
    line-height: 1.8;
}

.lesson-section {
    margin-bottom: 3rem;
}

.lesson-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    padding-top: 0.5rem;
}

.lesson-section h3 {
    font-size: 1.125rem;
    margin: 1.5rem 0 0.75rem;
}

.lesson-section p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.lesson-section ul,
.lesson-section ol {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.lesson-section li {
    margin-bottom: 0.5rem;
}

.lesson-section a {
    color: var(--accent-color);
    text-decoration: underline;
}

/* Info Boxes */
.info-box {
    background: var(--bg-secondary);
    border-left: 4px solid var(--accent-color);
    border-radius: 0 0.5rem 0.5rem 0;
    padding: 1rem 1.25rem;
    margin: 1.5rem 0;
}

.info-box.success {
    border-left-color: #22c55e;
}

.info-box.warning {
    border-left-color: #eab308;
}

.info-box-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.info-box-header svg {
    color: var(--accent-color);
}

.info-box.success .info-box-header svg {
    color: #22c55e;
}

.info-box.warning .info-box-header svg {
    color: #eab308;
}

.info-box p {
    margin: 0;
    font-size: 0.9375rem;
}

/* Syntax Box */
.syntax-box {
    background: var(--accent-light);
    border: 1px solid var(--accent-color);
    border-radius: 0.5rem;
    padding: 1rem 1.5rem;
    margin: 1rem 0 1.5rem;
    text-align: center;
}

.syntax-box code {
    font-size: 1rem;
    color: var(--accent-color);
    background: none;
    border: none;
    padding: 0;
}

/* Concept Cards */
.concept-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
}

.concept-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
}

.concept-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--accent-color);
}

.concept-card p {
    font-size: 0.875rem;
    margin: 0;
}

/* Use Cases */
.use-cases {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
}

.use-case {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
    text-align: center;
}

.use-case-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.use-case h4 {
    font-size: 0.9375rem;
    margin-bottom: 0.5rem;
}

.use-case p {
    font-size: 0.8125rem;
    margin: 0;
}

/* Steps List */
.steps-list {
    counter-reset: step;
    list-style: none;
    padding-left: 0;
}

.steps-list li {
    position: relative;
    padding-left: 2.5rem;
    margin-bottom: 1.5rem;
}

.steps-list li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 1.75rem;
    height: 1.75rem;
    background: var(--accent-light);
    color: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.steps-list li strong {
    color: var(--text-primary);
}

.steps-list li p {
    margin: 0.25rem 0 0.5rem;
}

/* Tool Options */
.tool-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
}

.tool-option {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
    position: relative;
}

.tool-option.recommended {
    border-color: var(--accent-color);
}

.tool-badge {
    position: absolute;
    top: -0.625rem;
    right: 1rem;
    background: var(--accent-color);
    color: white;
    font-size: 0.6875rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    text-transform: uppercase;
}

.tool-option h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.tool-option > p {
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
}

.tool-option ul {
    font-size: 0.8125rem;
    margin: 0;
    padding-left: 1rem;
}

.tool-option li {
    margin-bottom: 0.25rem;
}

/* Takeaways */
.takeaways {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.takeaway {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.takeaway svg {
    flex-shrink: 0;
    color: #22c55e;
    margin-top: 0.125rem;
}

.takeaway span {
    color: var(--text-secondary);
}

/* Exercise Box */
.exercise-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.exercise-box h4 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.exercise-box ol {
    margin-bottom: 1rem;
}

.exercise-box p:last-child {
    margin: 0;
}

/* Lesson Footer */
.lesson-footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.lesson-nav-buttons {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

.lesson-nav-buttons .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

/* Lesson Pages - Responsive */
@media (max-width: 1024px) {
    .lesson-layout {
        grid-template-columns: 240px 1fr;
    }
    
    .lesson-content {
        padding: 2rem 2rem 4rem;
    }
}

@media (max-width: 768px) {
    .lesson-layout {
        grid-template-columns: 1fr;
    }
    
    .lesson-sidebar {
        position: fixed;
        left: -100%;
        top: 4rem;
        width: 280px;
        height: calc(100vh - 4rem);
        z-index: 100;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
    }
    
    .lesson-sidebar.open {
        left: 0;
    }
    
    .lesson-content {
        padding: 1.5rem 1rem 3rem;
    }
    
    .lesson-header h1 {
        font-size: 1.75rem;
    }
    
    .lesson-meta {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .lesson-nav-buttons {
        flex-direction: column;
    }
    
    .lesson-nav-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    .concept-cards {
        grid-template-columns: 1fr;
    }
    
    .use-cases {
        grid-template-columns: 1fr;
    }
    
    .tool-options {
        grid-template-columns: 1fr;
    }
    
    .comparison-box {
        grid-template-columns: 1fr;
    }
    
    .type-row,
    .operator-row,
    .command-row {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .type-row.header,
    .operator-row.header {
        display: none;
    }
}

/* Mobile sidebar toggle button */
.mobile-lesson-toggle {
    display: none;
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    border: none;
    cursor: pointer;
    z-index: 99;
    box-shadow: var(--shadow-lg);
    align-items: center;
    justify-content: center;
}

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

/* Mobile sidebar overlay */
.lesson-sidebar-overlay {
    display: none;
    position: fixed;
    top: 4rem;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
}

.lesson-sidebar-overlay.show {
    display: block;
}

/* Code Explanation */
.code-explanation {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0;
}

.explanation-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1rem 1.25rem;
}

.explanation-item code {
    display: block;
    font-size: 0.9375rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.explanation-item p {
    margin: 0;
    font-size: 0.875rem;
}

/* Command Table */
.command-table {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin: 1.5rem 0;
}

.command-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    padding: 0.875rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    align-items: center;
}

.command-row code {
    font-size: 0.875rem;
}

.command-row span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Type Table */
.type-table {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin: 1.5rem 0;
    font-size: 0.875rem;
}

.type-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1.5fr 1.5fr;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    align-items: center;
}

.type-row.header {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
}

.type-row code {
    font-size: 0.8125rem;
}

.type-row span {
    color: var(--text-secondary);
}

/* Operator Table */
.operator-table {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin: 1.5rem 0;
    font-size: 0.875rem;
}

.operator-row {
    display: grid;
    grid-template-columns: 0.75fr 1.25fr 1fr 0.75fr;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    align-items: center;
}

.operator-row.header {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
}

.operator-row code {
    font-size: 0.875rem;
}

.operator-row span {
    color: var(--text-secondary);
}

/* Comparison Box */
.comparison-box {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.comparison-box.stacked {
    grid-template-columns: 1fr;
}

.comparison-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
}

.comparison-item h4 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--accent-color);
}

.comparison-item ul {
    margin: 0;
    padding-left: 1.25rem;
    font-size: 0.875rem;
}

.comparison-item li {
    margin-bottom: 0.375rem;
    color: var(--text-secondary);
}

.comparison-item pre {
    margin: 0;
    font-size: 0.8125rem;
}

.comparison-item p {
    margin: 0.75rem 0 0 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Method Cards */
.method-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.75rem;
    margin: 1.5rem 0;
}

.method-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    text-align: center;
}

.method-card code {
    display: block;
    font-size: 0.875rem;
    color: var(--accent-color);
    margin-bottom: 0.25rem;
}

.method-card span {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Congratulations Section */
.congratulations {
    background: var(--gradient-hero);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2.5rem;
    text-align: center;
    margin-top: 2rem;
}

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

.congrats-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: 1rem;
}

.congratulations h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.congratulations .congrats-content p {
    color: var(--text-secondary);
    font-size: 1.0625rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.congratulations ul {
    text-align: left;
    display: inline-block;
    margin: 0 0 2rem 0;
    padding-left: 1.5rem;
}

.congratulations li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.congratulations .btn {
    margin-top: 1rem;
    background: var(--accent-color);
    color: white;
}

.congratulations .btn:hover {
    background: var(--accent-hover);
    color: white;
}

/* ============================================
   C# Fundamentals Course - Additional Styles
   ============================================ */

/* Course Hero */
.course-hero {
    padding: 3rem 0 4rem;
    background: var(--gradient-hero);
}

.course-hero .back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    margin-bottom: 2rem;
    transition: color 0.2s ease;
}

.course-hero .back-link:hover {
    color: var(--accent-color);
}

.course-hero-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 4rem;
    align-items: center;
}

.course-hero-text {
    max-width: 700px;
}

.course-level {
    display: inline-block;
    padding: 0.375rem 1rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.course-level.beginner {
    background: rgba(34, 197, 94, 0.15);
    color: #22c55e;
}

.course-level.intermediate {
    background: rgba(234, 179, 8, 0.15);
    color: #eab308;
}

.course-level.advanced {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.course-hero h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    margin-bottom: 1rem;
}

.course-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 2rem;
}

.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 2rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
}

.meta-item svg {
    color: var(--accent-color);
}

.course-hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.course-icon {
    width: 200px;
    height: 200px;
}

.course-icon svg {
    width: 100%;
    height: 100%;
}

/* Course Content */
.course-content {
    padding: 4rem 0;
}

.course-layout {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 3rem;
}

.course-main {
    min-width: 0;
}

.course-section {
    margin-bottom: 3rem;
}

.course-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

/* Learning Outcomes */
.learning-outcomes {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.outcome-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
}

.outcome-item svg {
    flex-shrink: 0;
    color: #22c55e;
    margin-top: 0.125rem;
}

.outcome-item span {
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Lessons List */
.lessons-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.lesson-card {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 1.5rem;
    align-items: center;
    padding: 1.25rem 1.5rem;
    background: var(--card-bg);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

.lesson-card:hover {
    border-color: var(--accent-color);
    transform: translateX(4px);
}

.lesson-card .lesson-number {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-light);
    color: var(--accent-color);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.875rem;
}

.lesson-info h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.lesson-info p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin: 0;
}

.lesson-card .lesson-duration {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    white-space: nowrap;
}

/* Prerequisites */
.prerequisites-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.prerequisites-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.prerequisites-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

/* Course Sidebar */
.course-sidebar {
    position: sticky;
    top: 5rem;
    height: fit-content;
}

.sidebar-card {
    background: var(--card-bg);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.sidebar-card h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
}

.progress-bar {
    height: 0.5rem;
    background: var(--bg-tertiary);
    border-radius: 0.25rem;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 0.25rem;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: 1rem;
}

.sidebar-card .btn {
    width: 100%;
}

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

.includes-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.includes-list svg {
    color: var(--text-tertiary);
}

/* Flow Diagram (Lesson 5) */
.flow-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    margin: 1.5rem 0;
}

.flow-box {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    text-align: center;
}

.flow-box.start,
.flow-box.end {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 2rem;
}

.flow-box.condition {
    background: var(--accent-light);
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    transform: rotate(0deg);
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    padding: 1.5rem 2rem;
}

.flow-box.action {
    background: #22c55e20;
    border: 2px solid #22c55e;
    color: #22c55e;
}

.flow-box.skip {
    background: var(--bg-tertiary);
    border: 2px dashed var(--border-color);
    color: var(--text-tertiary);
}

.flow-arrow {
    color: var(--text-tertiary);
    font-size: 1.25rem;
    margin: 0.5rem 0;
}

.flow-branches {
    display: flex;
    gap: 3rem;
    margin: 1rem 0;
}

.flow-branch {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.branch-label {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    margin-bottom: 0.5rem;
}

.branch-label.yes {
    background: #22c55e20;
    color: #22c55e;
}

.branch-label.no {
    background: #ef444420;
    color: #ef4444;
}

/* Mistake Box (Lesson 5) */
.mistake-box {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-left: 4px solid #ef4444;
    border-radius: 0 0.5rem 0.5rem 0;
    padding: 1rem 1.25rem;
    margin: 1rem 0;
}

.mistake-box h4 {
    font-size: 0.9375rem;
    margin-bottom: 0.75rem;
    color: #ef4444;
}

.mistake-box pre {
    margin: 0;
}

/* Loop Diagram (Lesson 6) */
.loop-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    margin: 1.5rem 0;
}

.loop-step {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 0.875rem;
}

.loop-step.condition {
    background: var(--accent-light);
    border-color: var(--accent-color);
}

.step-num {
    width: 1.5rem;
    height: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-color);
    color: white;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.loop-arrow {
    color: var(--text-tertiary);
    font-size: 1rem;
    margin: 0.375rem 0;
}

.loop-arrow.loop-back {
    color: var(--accent-color);
    font-weight: 500;
}

/* Loop Choice Table (Lesson 6) */
.loop-choice-table {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
}

.loop-choice {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
}

.loop-choice h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--accent-color);
}

.loop-choice p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.loop-choice code {
    font-size: 0.8125rem;
    display: block;
}

/* Benefits Grid (Lesson 7) */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
}

.benefit-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
    text-align: center;
}

.benefit-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.75rem;
}

.benefit-item h4 {
    font-size: 0.9375rem;
    margin-bottom: 0.375rem;
}

.benefit-item p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Method Anatomy (Lesson 7) */
.method-anatomy {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin: 1.5rem 0;
}

.anatomy-item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    align-items: center;
}

.anatomy-item code {
    font-size: 0.9375rem;
    color: var(--accent-color);
}

.anatomy-item span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Array Visual (Lesson 8) */
.array-visual {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    margin: 1.5rem 0;
    text-align: center;
}

.array-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9375rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.array-boxes {
    display: flex;
    justify-content: center;
    gap: 0.25rem;
}

.array-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--bg-tertiary);
    border: 2px solid var(--accent-color);
    border-radius: 0.375rem;
    padding: 0.75rem 1rem;
    min-width: 3.5rem;
}

.box-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.box-index {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: 0.25rem;
}

/* Collection Cards (Lesson 8) */
.collection-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
}

.collection-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
}

.collection-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--accent-color);
}

.collection-card > p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.collection-card pre {
    margin: 0;
    font-size: 0.75rem;
    padding: 0.75rem !important;
}

/* OOP Pillars (Lesson 9) */
.oop-pillars {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
}

.pillar {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
    text-align: center;
}

.pillar-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.75rem;
}

.pillar h4 {
    font-size: 0.9375rem;
    margin-bottom: 0.375rem;
    color: var(--accent-color);
}

.pillar p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Class Diagram (Lesson 9) */
.class-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    margin: 1.5rem 0;
}

.diagram-class {
    background: var(--accent-light);
    border: 2px solid var(--accent-color);
    border-radius: 0.5rem;
    padding: 1rem;
    min-width: 250px;
}

.diagram-header {
    font-weight: 600;
    color: var(--accent-color);
    text-align: center;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--accent-color);
    margin-bottom: 0.75rem;
}

.diagram-section {
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.diagram-section strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.diagram-section span {
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8125rem;
}

.diagram-arrow {
    color: var(--text-tertiary);
    font-size: 1.25rem;
    margin: 1rem 0;
}

.diagram-objects {
    display: flex;
    gap: 1rem;
}

.diagram-object {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    min-width: 120px;
}

.object-header {
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.diagram-object span {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

/* Access Table (Lesson 9) */
.access-table {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin: 1.5rem 0;
}

.access-row {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    align-items: center;
}

.access-row.header {
    background: var(--bg-tertiary);
    font-weight: 600;
}

.access-row code {
    font-size: 0.875rem;
}

.access-row span {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Inheritance Diagram (Lesson 10) */
.inheritance-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    margin: 1.5rem 0;
}

.diagram-box {
    border-radius: 0.5rem;
    padding: 1rem;
    min-width: 150px;
    text-align: center;
}

.diagram-box.base {
    background: var(--accent-light);
    border: 2px solid var(--accent-color);
}

.diagram-box.derived {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
}

.box-header {
    font-weight: 600;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0.5rem;
}

.diagram-box.base .box-header {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

.box-content {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.box-content span {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

.diagram-arrows {
    display: flex;
    gap: 3rem;
    margin: 1rem 0;
    font-size: 1.5rem;
    color: var(--text-tertiary);
}

.diagram-derived {
    display: flex;
    gap: 1rem;
}

/* Keyword Table (Lesson 10) */
.keyword-table {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin: 1.5rem 0;
}

.keyword-row {
    display: grid;
    grid-template-columns: 120px 140px 1fr;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    align-items: center;
}

.keyword-row.header {
    background: var(--bg-tertiary);
    font-weight: 600;
}

.keyword-row code {
    font-size: 0.875rem;
    color: var(--accent-color);
}

.keyword-row span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Exception Flow (Lesson 11) */
.exception-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    margin: 1.5rem 0;
}

.flow-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.375rem;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.8125rem;
    font-weight: 500;
    min-width: 100px;
    text-align: center;
}

.flow-step.error {
    background: #ef444420;
    border: 1px solid #ef4444;
    color: #ef4444;
}

.flow-step.exception {
    background: #eab30820;
    border: 1px solid #eab308;
    color: #eab308;
}

.flow-step.handle {
    background: #3b82f620;
    border: 1px solid #3b82f6;
    color: #3b82f6;
}

.flow-step.success {
    background: #22c55e20;
    border: 1px solid #22c55e;
    color: #22c55e;
}

.step-icon {
    font-size: 1.25rem;
}

/* Property Table (Lesson 11) */
.property-table {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin: 1.5rem 0;
}

.property-row {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    align-items: center;
}

.property-row.header {
    background: var(--bg-tertiary);
    font-weight: 600;
}

.property-row code {
    font-size: 0.875rem;
    color: var(--accent-color);
}

.property-row span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Try-Catch Diagram (Lesson 11) */
.try-catch-diagram {
    display: flex;
    gap: 1rem;
    margin: 1.5rem 0;
}

.diagram-block {
    flex: 1;
    border-radius: 0.5rem;
    overflow: hidden;
}

.block-header {
    padding: 0.5rem 1rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
}

.block-content {
    padding: 0.75rem 1rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.block-note {
    padding: 0.25rem 1rem 0.75rem;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-style: italic;
}

.diagram-block.try {
    border: 2px solid #3b82f6;
}

.diagram-block.try .block-header {
    background: #3b82f6;
    color: white;
}

.diagram-block.catch {
    border: 2px solid #eab308;
}

.diagram-block.catch .block-header {
    background: #eab308;
    color: black;
}

.diagram-block.finally {
    border: 2px solid #22c55e;
}

.diagram-block.finally .block-header {
    background: #22c55e;
    color: white;
}

/* Exception Cards (Lesson 11) */
.exception-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin: 1.5rem 0;
}

.exception-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.875rem 1rem;
}

.exception-card code {
    display: block;
    font-size: 0.8125rem;
    color: var(--accent-color);
    margin-bottom: 0.375rem;
}

.exception-card p {
    margin: 0;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* Best Practices (Lesson 11) */
.best-practices {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.practice {
    border-radius: 0.75rem;
    padding: 1.25rem;
}

.practice h4 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.practice.do {
    background: #22c55e10;
    border: 1px solid #22c55e;
}

.practice.do h4 {
    color: #22c55e;
}

.practice.dont {
    background: #ef444410;
    border: 1px solid #ef4444;
}

.practice.dont h4 {
    color: #ef4444;
}

.practice ul {
    margin: 0;
    padding-left: 1.25rem;
    font-size: 0.875rem;
}

.practice li {
    margin-bottom: 0.375rem;
    color: var(--text-secondary);
}

/* Truth Tables (Lesson 4) */
.truth-tables {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.truth-table {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1rem;
}

.truth-table h4 {
    text-align: center;
    margin-bottom: 0.75rem;
    font-size: 0.9375rem;
}

.table-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.25rem;
    font-size: 0.8125rem;
    text-align: center;
}

.table-grid span {
    padding: 0.375rem;
    background: var(--bg-tertiary);
    border-radius: 0.25rem;
}

.table-grid span:nth-child(-n+3) {
    font-weight: 600;
    background: var(--bg-secondary);
}

.result-true {
    color: #22c55e !important;
    font-weight: 600;
}

.result-false {
    color: #ef4444 !important;
    font-weight: 600;
}

/* Precedence List (Lesson 4) */
.precedence-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin: 1.5rem 0;
}

.precedence-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
}

.precedence-rank {
    width: 1.75rem;
    height: 1.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-light);
    color: var(--accent-color);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.75rem;
    flex-shrink: 0;
}

.precedence-item span:last-child {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.precedence-item code {
    margin-left: 0.5rem;
    font-size: 0.8125rem;
}

/* ============================================
   C# Fundamentals Course - Responsive Styles
   ============================================ */

@media (max-width: 1024px) {
    .course-layout {
        grid-template-columns: 1fr;
        display: flex;
        flex-direction: column;
    }

    .course-sidebar {
        position: static;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 1rem;
        order: -1; /* Move sidebar above main content */
        margin-bottom: 1rem;
    }

    .course-main {
        order: 1;
    }

    .sidebar-card {
        margin-bottom: 0;
        padding: 1.25rem;
    }

    .course-content {
        padding: 0.5rem 0 1.5rem;
    }

    .oop-pillars {
        grid-template-columns: repeat(2, 1fr);
    }

    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .collection-cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .course-hero {
        padding: 2rem 0 3rem;
    }

    .course-hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .course-hero-image {
        order: -1;
    }

    .course-icon {
        width: 120px;
        height: 120px;
    }

    .course-description {
        font-size: 1rem;
    }

    .learning-outcomes {
        grid-template-columns: 1fr;
    }

    .lesson-card {
        grid-template-columns: auto 1fr;
        gap: 1rem;
    }

    .lesson-card .lesson-duration {
        grid-column: 2;
        margin-top: -0.5rem;
    }

    .flow-branches {
        gap: 1.5rem;
    }

    .flow-box.condition {
        padding: 1rem 1.5rem;
        font-size: 0.75rem;
    }

    .loop-step {
        font-size: 0.8125rem;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
    }

    .anatomy-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .array-boxes {
        flex-wrap: wrap;
    }

    .array-box {
        min-width: 2.5rem;
        padding: 0.5rem 0.75rem;
    }

    .box-value {
        font-size: 1rem;
    }

    .oop-pillars {
        grid-template-columns: 1fr;
    }

    .diagram-objects {
        flex-direction: column;
    }

    .access-row {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }

    .diagram-derived {
        flex-direction: column;
    }

    .diagram-arrows {
        flex-direction: column;
        gap: 0.5rem;
        align-items: center;
    }

    .keyword-row {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }

    .exception-flow {
        flex-direction: column;
    }

    .exception-flow .flow-arrow {
        transform: rotate(90deg);
    }

    .try-catch-diagram {
        flex-direction: column;
    }

    .exception-cards {
        grid-template-columns: 1fr;
    }

    .best-practices {
        grid-template-columns: 1fr;
    }

    .property-row {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }

    .truth-tables {
        grid-template-columns: 1fr;
    }

    .loop-choice-table {
        grid-template-columns: 1fr;
    }
}

/* Blazor Error UI */
#blazor-error-ui {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem;
    background: #b32121;
    color: white;
    text-align: center;
    z-index: 9999;
}

#blazor-error-ui.show,
#blazor-error-ui:has(~ .blazor-error-boundary) {
    display: block;
}

#blazor-error-ui .reload {
    color: white;
    margin-left: 0.5rem;
}

#blazor-error-ui .dismiss {
    cursor: pointer;
    margin-left: 1rem;
}