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

:root {
    /* Default theme - Neon Green Matrix */
    --bg-primary: #0a0a0a;
    --bg-secondary: #0f0f19;
    --text-primary: #00ff00;
    --text-secondary: #b0b0b0;
    --nav-bg: #000000;
    --nav-text: #00ff00;
    --accent-primary: #00ff00;
    --accent-hover: #00cc00;
    --border-color: rgba(0, 255, 0, 0.3);
    --card-shadow: rgba(0, 255, 0, 0.2);
    --neon-glow: rgba(0, 255, 0, 0.8);
}

/* Cyber Blue Theme */
body.theme-cyber-blue {
    --bg-primary: #0a0e1a;
    --bg-secondary: #0f1624;
    --text-primary: #00d9ff;
    --text-secondary: #a0b0c0;
    --nav-bg: #000510;
    --nav-text: #00d9ff;
    --accent-primary: #00d9ff;
    --accent-hover: #00b3d9;
    --border-color: rgba(0, 217, 255, 0.3);
    --card-shadow: rgba(0, 217, 255, 0.2);
    --neon-glow: rgba(0, 217, 255, 0.8);
}

/* Purple Haze Theme */
body.theme-purple {
    --bg-primary: #0f0a1a;
    --bg-secondary: #1a0f2e;
    --text-primary: #c77dff;
    --text-secondary: #b0a0c0;
    --nav-bg: #0a0515;
    --nav-text: #c77dff;
    --accent-primary: #c77dff;
    --accent-hover: #b366ff;
    --border-color: rgba(199, 125, 255, 0.3);
    --card-shadow: rgba(199, 125, 255, 0.2);
    --neon-glow: rgba(199, 125, 255, 0.8);
}

/* Fire Orange Theme */
body.theme-orange {
    --bg-primary: #1a0a00;
    --bg-secondary: #2a1505;
    --text-primary: #ff6b35;
    --text-secondary: #c0b0a0;
    --nav-bg: #100500;
    --nav-text: #ff6b35;
    --accent-primary: #ff6b35;
    --accent-hover: #ff8555;
    --border-color: rgba(255, 107, 53, 0.3);
    --card-shadow: rgba(255, 107, 53, 0.2);
    --neon-glow: rgba(255, 107, 53, 0.8);
}

/* Pink Neon Theme */
body.theme-pink {
    --bg-primary: #1a0a14;
    --bg-secondary: #2a0f1f;
    --text-primary: #ff006e;
    --text-secondary: #c0a0b0;
    --nav-bg: #0f0509;
    --nav-text: #ff006e;
    --accent-primary: #ff006e;
    --accent-hover: #ff338a;
    --border-color: rgba(255, 0, 110, 0.3);
    --card-shadow: rgba(255, 0, 110, 0.2);
    --neon-glow: rgba(255, 0, 110, 0.8);
}

/* Teal Wave Theme */
body.theme-teal {
    --bg-primary: #0a1a1a;
    --bg-secondary: #0f2a2a;
    --text-primary: #00ffc8;
    --text-secondary: #a0c0b8;
    --nav-bg: #05100f;
    --nav-text: #00ffc8;
    --accent-primary: #00ffc8;
    --accent-hover: #00d9a3;
    --border-color: rgba(0, 255, 200, 0.3);
    --card-shadow: rgba(0, 255, 200, 0.2);
    --neon-glow: rgba(0, 255, 200, 0.8);
}

body.dark-theme {
    /* Keep for backwards compatibility */
    --bg-primary: #0a0a0a;
    --bg-secondary: #0f0f19;
    --text-primary: #00ff00;
    --text-secondary: #b0b0b0;
    --nav-bg: #000000;
    --nav-text: #00ff00;
    --accent-primary: #00ff00;
    --accent-hover: #00cc00;
    --border-color: rgba(0, 255, 0, 0.3);
    --card-shadow: rgba(0, 255, 0, 0.2);
    --neon-glow: rgba(0, 255, 0, 0.8);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: background 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Theme Toggle Button */
.theme-toggle {
    background: var(--accent-primary);
    color: #000000;  /* Fixed black color for visibility across all themes */
    border: 2px solid var(--accent-primary);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 0 10px var(--neon-glow);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle:hover {
    background: var(--accent-hover);
    box-shadow: 0 0 20px var(--neon-glow);
    transform: scale(1.05);
    color: #000000;  /* Keep black on hover too */
}

/* Navigation */
.navbar {
    background: var(--nav-bg);
    color: var(--nav-text);
    padding: 1rem 0;
    box-shadow: 0 2px 15px var(--card-shadow);
    border-bottom: 2px solid var(--accent-primary);
    transition: all 0.3s ease;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--nav-text);
    text-decoration: none;
    text-shadow: 0 0 10px var(--neon-glow);
    transition: all 0.3s ease;
}

.logo:hover {
    text-shadow: 0 0 20px var(--neon-glow);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--nav-text);
    text-decoration: none;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

.nav-links a:hover {
    color: var(--accent-primary);
    text-shadow: 0 0 10px var(--neon-glow);
    background: rgba(52, 152, 219, 0.1);
}

/* Main Content */
main {
    min-height: calc(100vh - 180px);
    padding: 2rem 0;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0;
    background: var(--bg-secondary);
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 20px var(--card-shadow);
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.hero:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 4px 30px var(--neon-glow);
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    text-shadow: 0 0 15px var(--neon-glow);
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    box-shadow: 0 0 15px var(--neon-glow);
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 0 25px var(--neon-glow);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background: var(--text-primary);
    box-shadow: 0 0 15px rgba(127, 140, 141, 0.5);
    transform: translateY(-2px);
}

.btn-success {
    background: #28a745;
    color: white;
    border-color: #28a745;
}

.btn-success:hover {
    background: #218838;
    box-shadow: 0 0 15px rgba(40, 167, 69, 0.5);
    transform: translateY(-2px);
}

.btn-danger {
    background: #dc3545;
    color: white;
    border-color: #dc3545;
}

.btn-danger:hover {
    background: #c82333;
    box-shadow: 0 0 15px rgba(220, 53, 69, 0.5);
    transform: translateY(-2px);
}

/* Categories */
.categories {
    margin: 3rem 0;
}

.categories h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-primary);
    text-shadow: 0 0 10px var(--neon-glow);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.category-card {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 20px var(--card-shadow);
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--neon-glow) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.category-card:hover::before {
    opacity: 0.1;
}

.category-card:hover {
    transform: translateY(-8px);
    border-color: var(--accent-primary);
    box-shadow: 0 8px 30px var(--neon-glow);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 10px var(--neon-glow));
}

.category-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
}

.category-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

/* Features */
.features {
    margin: 3rem 0;
    background: white;
    padding: 3rem 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.features h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #2c3e50;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-item {
    text-align: center;
    padding: 1rem;
}

.feature-item h3 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.feature-item p {
    color: #7f8c8d;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 20px var(--card-shadow);
    border: 2px solid var(--accent-primary);
}

.page-header h1 {
    color: var(--text-primary);
    text-shadow: 0 0 10px var(--neon-glow);
}

/* Codes List */
.codes-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.code-item {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px var(--card-shadow);
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.code-item:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 4px 25px var(--neon-glow);
    transform: translateX(5px);
}

.code-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.code-item h3 {
    color: var(--text-primary);
}

.code-date {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.code-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.code-item-actions {
    margin-top: 1rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--card-shadow);
    border: 2px dashed var(--accent-primary);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* Code Viewer */
.code-viewer {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 20px var(--card-shadow);
    border: 2px solid var(--accent-primary);
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--accent-primary);
    box-shadow: 0 2px 10px var(--neon-glow);
}

.code-header h1 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    text-shadow: 0 0 10px var(--neon-glow);
}

.code-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.code-content {
    margin-bottom: 2rem;
}

.code-content h2 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.code-editor-wrapper {
    border: 2px solid var(--accent-primary);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 0 20px var(--neon-glow);
}

.CodeMirror {
    height: auto;
    min-height: 300px;
    font-size: 14px;
}

/* Execution Panel */
.execution-panel {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--accent-primary);
    box-shadow: 0 -2px 10px var(--neon-glow);
}

.execution-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.execution-controls h2 {
    color: var(--text-primary);
}

.input-section {
    margin-bottom: 1.5rem;
}

.input-section label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: bold;
}

#stdin-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--accent-primary);
    border-radius: 8px;
    font-family: monospace;
    resize: vertical;
    background: var(--bg-secondary);
    color: var(--text-primary);
    box-shadow: 0 0 10px var(--neon-glow);
    transition: all 0.3s ease;
}

#stdin-input:focus {
    outline: none;
    box-shadow: 0 0 20px var(--neon-glow);
    border-color: var(--accent-hover);
}

.output-section {
    margin-top: 1.5rem;
}

.output-section h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.output-display {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 1.5rem;
    border-radius: 8px;
    min-height: 200px;
    font-family: 'Courier New', monospace;
    white-space: pre-wrap;
    word-wrap: break-word;
    border: 2px solid var(--accent-primary);
    box-shadow: 0 0 20px var(--neon-glow);
}

.dark-theme .output-display {
    background: #000000;
    border-color: #00d4ff;
}

.output-placeholder {
    color: var(--text-secondary);
    font-style: italic;
}

.output-loading {
    color: var(--accent-primary);
}

.output-error {
    color: #ff4757;
    text-shadow: 0 0 5px rgba(255, 71, 87, 0.5);
}

.output-display pre {
    margin: 0;
    font-family: 'Courier New', monospace;
    color: var(--text-primary);
}

/* Upload Form */
.upload-page {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--card-shadow);
    margin-bottom: 2rem;
    border: 2px solid var(--accent-primary);
}

.upload-page h1 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    text-shadow: 0 0 10px var(--neon-glow);
}

.upload-form {
    max-width: 800px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: bold;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--accent-primary);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow: 0 0 10px var(--neon-glow);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    box-shadow: 0 0 20px var(--neon-glow);
    border-color: var(--accent-hover);
}

.form-group textarea {
    font-family: 'Courier New', monospace;
    resize: vertical;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* Upload Examples */
.upload-examples {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--card-shadow);
    border: 2px solid var(--accent-primary);
}

.upload-examples h2 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.example-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.example-card {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-primary);
    transition: all 0.3s ease;
}

.example-card:hover {
    box-shadow: 0 0 15px var(--neon-glow);
}

.example-card h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.example-card pre {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 1rem;
    border-radius: 5px;
    overflow-x: auto;
    font-size: 0.9rem;
    border: 1px solid var(--accent-primary);
}

/* Footer */
footer {
    background: var(--nav-bg);
    color: var(--nav-text);
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
    border-top: 2px solid var(--accent-primary);
}

footer p {
    margin: 0.5rem 0;
}

footer a {
    transition: all 0.3s ease;
}

footer a:hover {
    text-shadow: 0 0 10px var(--neon-glow);
    transform: scale(1.05);
    display: inline-block;
}

/* Responsive Design */
@media (max-width: 768px) {
    .category-grid,
    .feature-grid,
    .example-grid {
        grid-template-columns: 1fr;
    }

    .page-header {
        flex-direction: column;
        gap: 1rem;
    }

    .code-header {
        flex-direction: column;
        gap: 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }
}