body.dark-theme {
    /* Dark theme - Black background, yellow text */
    --primary-color: #F7DF1E;
    --primary-hover: #e4ce0d;
    --text-primary: #F7DF1E;
    --text-secondary: #e4ce0d;
    --bg-primary: #000000;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --border-color: #F7DF1E;
    --shadow-sm: 0 1px 3px 0 rgba(247, 223, 30, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(247, 223, 30, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(247, 223, 30, 0.4);
    --success-color: #51cf66;
    --warning-color: #ffd93d;
    --danger-color: #ff6b6b;
}

body.dark-theme .code-input {
    background-color: #0f172a;
    color: #e2e8f0;
}

body.dark-theme .code-output {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

body.dark-theme .stat-card i,
body.dark-theme .module-header i,
body.dark-theme .exercise-header i {
    color: var(--js-yellow);
}

body.dark-theme .progress-fill {
    background: var(--js-yellow);
}

body.dark-theme .hero-title {
    color: var(--js-yellow);
}

body.dark-theme .navbar {
    background-color: var(--js-yellow);
    border-bottom-color: var(--js-black);
}

body.dark-theme .nav-brand {
    color: var(--js-black);
}

body.dark-theme .nav-btn {
    color: var(--js-black);
    border-color: transparent;
}

body.dark-theme .nav-btn:hover {
    background-color: var(--js-black);
    color: var(--js-yellow);
    border-color: var(--js-black);
}

body.dark-theme .btn-primary {
    background-color: var(--js-yellow);
    color: var(--js-black);
    border-color: var(--js-yellow);
}

body.dark-theme .btn-primary:hover {
    background-color: var(--js-black);
    color: var(--js-yellow);
    border-color: var(--js-yellow);
}

body.dark-theme .editor-tab.active {
    background-color: var(--bg-tertiary);
    color: var(--js-yellow);
}

body.dark-theme .option-btn:hover {
    border-color: var(--js-yellow);
    background-color: var(--bg-tertiary);
}

body.dark-theme .hint-btn {
    color: var(--js-yellow);
}

body.dark-theme .editor-btn {
    background-color: var(--js-yellow);
    color: var(--js-black);
    border-color: var(--js-yellow);
}

body.dark-theme .editor-btn:hover {
    background-color: var(--js-black);
    color: var(--js-yellow);
    border-color: var(--js-yellow);
}

body.dark-theme .btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--js-yellow);
}

body.dark-theme .btn-secondary:hover {
    background-color: var(--js-yellow);
    color: var(--js-black);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes confetti {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

body.dark-theme .modal-content {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--js-yellow);
}

body.dark-theme .tooltip .tooltip-text {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--js-yellow);
}

body.dark-theme .btn-warning {
    background-color: var(--js-yellow);
    color: var(--js-black);
    border-color: var(--js-yellow);
}

body.dark-theme .btn-warning:hover {
    background-color: var(--js-black);
    color: var(--js-yellow);
    border-color: var(--js-yellow);
}

.animate-fadeIn {
    animation: fadeIn 0.5s ease-out;
}

.animate-slideIn {
    animation: slideIn 0.3s ease-out;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

.celebration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
}

.confetti-piece {
    position: absolute;
    width: 10px;
    height: 10px;
    background: linear-gradient(45deg, var(--js-yellow), var(--js-black), var(--js-yellow-darker), var(--success-color), var(--warning-color));
    animation: confetti 3s ease-out forwards;
}

.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltip-text {
    visibility: hidden;
    width: 200px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    text-align: center;
    border-radius: var(--radius-md);
    padding: 0.5rem;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
    box-shadow: var(--shadow-md);
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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

.success-animation {
    display: inline-block;
    width: 24px;
    height: 24px;
    background-color: var(--success-color);
    border-radius: 50%;
    position: relative;
    animation: scaleIn 0.3s ease-out;
}

.success-animation::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-weight: bold;
}

@keyframes scaleIn {
    from {
        transform: scale(0);
    }
    to {
        transform: scale(1);
    }
}

.highlight {
    background-color: rgba(59, 130, 246, 0.2);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: background-color 0.3s ease;
}

.highlight:hover {
    background-color: rgba(59, 130, 246, 0.3);
}

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