/* Lesson 10: Advanced CSS Techniques - Professional Styling */

/* Import Base Styles */
@import url('../assets/styles.css');

/* ==========================================================================
   Animation Keyframes
   ========================================================================== */

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

@keyframes slideIn {
    from { 
        transform: translateX(-100%);
        opacity: 0;
    }
    to { 
        transform: translateX(0);
        opacity: 1;
    }
}

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

@keyframes rotateIn {
    from { 
        transform: rotate(-180deg) scale(0);
        opacity: 0;
    }
    to { 
        transform: rotate(0deg) scale(1);
        opacity: 1;
    }
}

@keyframes bounceIn {
    0% { 
        transform: scale(0.3);
        opacity: 0;
    }
    50% { 
        transform: scale(1.05);
        opacity: 0.8;
    }
    70% { 
        transform: scale(0.9);
        opacity: 0.9;
    }
    100% { 
        transform: scale(1);
        opacity: 1;
    }
}

/* Complex Animations */
@keyframes float {
    0%, 100% { 
        transform: translateY(0) rotate(0deg);
    }
    25% { 
        transform: translateY(-20px) rotate(5deg);
    }
    50% { 
        transform: translateY(-10px) rotate(0deg);
    }
    75% { 
        transform: translateY(-15px) rotate(-5deg);
    }
}

@keyframes pulse {
    0% { 
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(52, 152, 219, 0.7);
    }
    50% { 
        transform: scale(1.05);
        box-shadow: 0 0 0 20px rgba(52, 152, 219, 0);
    }
    100% { 
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(52, 152, 219, 0);
    }
}

@keyframes morph {
    0% { 
        border-radius: 50%;
        transform: rotate(0deg);
        background: var(--color-warning);
    }
    25% { 
        border-radius: 0;
        transform: rotate(90deg);
        background: var(--color-secondary);
    }
    50% { 
        border-radius: 50% 0;
        transform: rotate(180deg);
        background: var(--color-success);
    }
    75% { 
        border-radius: 0 50%;
        transform: rotate(270deg);
        background: var(--color-accent);
    }
    100% { 
        border-radius: 50%;
        transform: rotate(360deg);
        background: var(--color-warning);
    }
}

@keyframes rainbow {
    0% { color: #e74c3c; }
    16% { color: #f39c12; }
    33% { color: #f1c40f; }
    50% { color: #2ecc71; }
    66% { color: #3498db; }
    83% { color: #9b59b6; }
    100% { color: #e74c3c; }
}

@keyframes slideScale {
    0% {
        transform: translateX(-100%) scale(0.5);
        opacity: 0;
    }
    50% {
        transform: translateX(0) scale(1.1);
        opacity: 0.8;
    }
    100% {
        transform: translateX(0) scale(1);
        opacity: 1;
    }
}

/* Interactive Animation Keyframes */
@keyframes slideUp {
    from { 
        transform: translateY(50px);
        opacity: 0;
    }
    to { 
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes slideRight {
    from { 
        transform: translateX(-50px);
        opacity: 0;
    }
    to { 
        transform: translateX(0);
        opacity: 1;
    }
}

/* Click Animation Keyframes */
@keyframes clickPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

@keyframes clickBounce {
    0%, 20%, 60%, 100% { transform: translateY(0); }
    40% { transform: translateY(-20px); }
    80% { transform: translateY(-10px); }
}

@keyframes clickSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes clickWobble {
    0% { transform: translateX(0); }
    15% { transform: translateX(-25px) rotate(-5deg); }
    30% { transform: translateX(20px) rotate(3deg); }
    45% { transform: translateX(-15px) rotate(-3deg); }
    60% { transform: translateX(10px) rotate(2deg); }
    75% { transform: translateX(-5px) rotate(-1deg); }
    100% { transform: translateX(0); }
}

/* ==========================================================================
   Animations Playground
   ========================================================================== */

.animations-playground {
    background: var(--color-surface);
    border-radius: 16px;
    padding: 2rem;
    border: 2px solid var(--color-border);
}

.animation-demos {
    margin-top: 2rem;
}

.demo-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    background: var(--color-card);
    padding: 0.5rem;
    border-radius: 12px;
    overflow-x: auto;
}

.demo-tab {
    padding: 1rem 1.5rem;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--color-text-light);
    cursor: pointer;
    font-weight: 600;
    white-space: nowrap;
    transition: all 0.3s ease;
}

.demo-tab:hover {
    background: var(--color-muted);
    color: var(--color-text);
}

.demo-tab.active {
    background: var(--color-primary);
    color: white;
}

.demo-content {
    background: var(--color-card);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.animation-demo {
    display: none;
    padding: 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.animation-demo.active {
    display: grid;
}

.demo-area {
    background: var(--color-background);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--color-border);
}

.demo-area h4 {
    margin: 0 0 1.5rem 0;
    color: var(--color-primary);
}

.code-panel {
    background: var(--color-code-bg);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--color-border);
}

.code-panel h5 {
    margin: 0 0 1rem 0;
    color: var(--color-primary);
}

.code-block {
    background: rgba(0,0,0,0.05);
    border-radius: 8px;
    padding: 1rem;
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--color-text);
    white-space: pre;
}

/* Basic Animation Examples */
.basic-animations {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.animation-box {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    padding: 1.5rem 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.animation-box:hover {
    transform: translateY(-2px);
}

.animation-box.fade-in {
    animation: fadeIn 2s ease-in-out;
}

.animation-box.slide-in {
    animation: slideIn 1.5s ease-out;
}

.animation-box.scale-in {
    animation: scaleIn 1s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.animation-box.rotate-in {
    animation: rotateIn 1.2s ease-out;
}

.animation-box.bounce-in {
    animation: bounceIn 1.5s ease-out;
}

.replay-btn {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.replay-btn:hover {
    background: var(--color-secondary);
    transform: translateY(-1px);
}

/* Keyframe Stage */
.keyframe-stage {
    background: var(--color-muted);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.complex-animation {
    position: relative;
}

.floating-element {
    background: var(--color-primary);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    animation: float 3s ease-in-out infinite;
}

.pulsing-circle {
    width: 60px;
    height: 60px;
    background: var(--color-secondary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.morphing-shape {
    width: 60px;
    height: 60px;
    animation: morph 4s linear infinite;
}

.rainbow-text {
    font-size: 1.5rem;
    font-weight: 700;
    animation: rainbow 3s linear infinite;
}

.animation-controls {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.animation-controls button {
    padding: 0.5rem 1rem;
    background: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.animation-controls button:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* Animation Properties Playground */
.properties-playground {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 2rem;
    align-items: start;
}

.animated-box {
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-warning));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    border-radius: 8px;
    margin: 2rem auto;
}

.property-controls {
    background: var(--color-card);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.control-group {
    margin-bottom: 1rem;
}

.control-group label {
    display: block;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.control-group input,
.control-group select {
    width: 100%;
    padding: 0.5rem;
    border: 2px solid var(--color-border);
    border-radius: 6px;
    background: var(--color-background);
    color: var(--color-text);
    font-family: inherit;
}

.control-group input:focus,
.control-group select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.apply-properties-btn {
    background: var(--color-success);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    width: 100%;
    margin-top: 1rem;
    transition: all 0.2s ease;
}

.apply-properties-btn:hover {
    background: var(--color-primary);
    transform: translateY(-1px);
}

.generated-css {
    background: var(--color-code-bg);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    border: 1px solid var(--color-border);
}

.generated-css h6 {
    margin: 0 0 0.5rem 0;
    color: var(--color-primary);
    font-size: 0.9rem;
}

.generated-css code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text);
}

/* Interactive Elements */
.interactive-elements {
    display: grid;
    gap: 2rem;
}

.hover-animations h5,
.click-animations h5,
.scroll-animations h5 {
    margin: 0 0 1rem 0;
    color: var(--color-primary);
}

.hover-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.hover-card {
    background: var(--color-card);
    padding: 2rem 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    cursor: pointer;
    border: 2px solid var(--color-border);
    transition: all 0.3s ease;
}

.hover-card.lift:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.hover-card.flip:hover {
    transform: rotateY(180deg);
}

.hover-card.glow:hover {
    box-shadow: 0 0 20px var(--color-primary);
    border-color: var(--color-primary);
}

.hover-card.shake:hover {
    animation: clickWobble 0.6s ease-in-out;
}

.click-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.click-btn {
    padding: 0.75rem 1.5rem;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.click-btn:hover {
    background: var(--color-secondary);
}

.click-btn.pulse-animation {
    animation: clickPulse 0.6s ease-in-out;
}

.click-btn.bounce-animation {
    animation: clickBounce 0.8s ease-in-out;
}

.click-btn.spin-animation {
    animation: clickSpin 0.5s ease-in-out;
}

.click-btn.wobble-animation {
    animation: clickWobble 0.6s ease-in-out;
}

.scroll-container {
    display: grid;
    gap: 1rem;
    max-height: 300px;
    overflow-y: auto;
    padding: 1rem;
    background: var(--color-muted);
    border-radius: 8px;
}

.scroll-item {
    background: var(--color-card);
    padding: 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    text-align: center;
    border: 1px solid var(--color-border);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.scroll-item.animate-slideUp {
    animation: slideUp 0.6s ease-out forwards;
}

.scroll-item.animate-slideRight {
    animation: slideRight 0.6s ease-out forwards;
}

.scroll-item.animate-fadeIn {
    animation: fadeIn 0.6s ease-out forwards;
}

.scroll-item.animate-scaleIn {
    animation: scaleIn 0.6s ease-out forwards;
}

.scroll-item.animate-rotateIn {
    animation: rotateIn 0.6s ease-out forwards;
}

/* ==========================================================================
   CSS Transforms Section
   ========================================================================== */

.transforms-section {
    background: var(--color-surface);
    border-radius: 16px;
    padding: 2rem;
    border: 2px solid var(--color-border);
}

.transforms-demo {
    margin-top: 2rem;
    display: grid;
    gap: 3rem;
}

.transform-types {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.transform-category {
    background: var(--color-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.transform-category h4 {
    margin: 0 0 1.5rem 0;
    color: var(--color-primary);
}

.transform-examples {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.transform-box {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
    color: white;
    padding: 2rem 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.5s ease;
}

.transform-box:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* 3D Transform Examples */
.transform-3d-examples {
    display: grid;
    gap: 1.5rem;
    justify-items: center;
}

.cube-container {
    perspective: 600px;
    width: 150px;
    height: 150px;
}

.cube {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.8s ease;
}

.face {
    position: absolute;
    width: 150px;
    height: 150px;
    background: var(--color-primary);
    border: 2px solid var(--color-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: white;
    opacity: 0.9;
}

.face.front { transform: translateZ(75px); }
.face.back { transform: rotateY(180deg) translateZ(75px); }
.face.right { transform: rotateY(90deg) translateZ(75px); }
.face.left { transform: rotateY(-90deg) translateZ(75px); }
.face.top { transform: rotateX(90deg) translateZ(75px); }
.face.bottom { transform: rotateX(-90deg) translateZ(75px); }

.cube-controls {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.cube-controls button {
    padding: 0.5rem 1rem;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.cube-controls button:hover {
    background: var(--color-secondary);
}

/* Transform Playground */
.transform-playground {
    background: var(--color-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.transform-playground h4 {
    margin: 0 0 1.5rem 0;
    color: var(--color-primary);
}

.playground-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

.transform-target {
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, var(--color-warning), var(--color-accent));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    border-radius: 8px;
    margin: 2rem auto;
    transition: transform 0.3s ease;
}

.transform-controls {
    background: var(--color-background);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.control-section {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}

.control-section:last-of-type {
    border-bottom: none;
    margin-bottom: 1rem;
}

.control-section h5 {
    margin: 0 0 1rem 0;
    color: var(--color-primary);
    font-size: 1rem;
}

.control-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.control-row label {
    flex: 1;
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.9rem;
}

.control-row input {
    flex: 2;
}

.transform-output {
    background: var(--color-code-bg);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.transform-output h6 {
    margin: 0 0 0.5rem 0;
    color: var(--color-primary);
    font-size: 0.9rem;
}

.transform-output code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text);
}

/* ==========================================================================
   Custom Properties Section
   ========================================================================== */

.custom-properties-section {
    background: var(--color-surface);
    border-radius: 16px;
    padding: 2rem;
    border: 2px solid var(--color-border);
}

.variables-demo {
    margin-top: 2rem;
    display: grid;
    gap: 3rem;
}

.theme-customizer {
    background: var(--color-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.theme-customizer h4 {
    margin: 0 0 1.5rem 0;
    color: var(--color-primary);
}

.customizer-content {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 2rem;
}

.theme-preview {
    background: var(--color-background);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.preview-card {
    background: var(--primary-color, var(--color-primary));
    color: white;
    padding: var(--spacing, 1.5rem);
    border-radius: var(--border-radius, 8px);
    text-align: center;
}

.preview-card h5 {
    margin: 0 0 1rem 0;
    font-size: var(--font-size, 1rem);
}

.preview-card p {
    margin: 0 0 1.5rem 0;
    font-size: calc(var(--font-size, 16px) * 0.9);
    opacity: 0.9;
}

.preview-btn {
    background: var(--secondary-color, var(--color-secondary));
    color: white;
    border: none;
    padding: calc(var(--spacing, 16px) * 0.5) var(--spacing, 1rem);
    border-radius: var(--border-radius, 8px);
    cursor: pointer;
    font-weight: 600;
    font-size: var(--font-size, 1rem);
    transition: all 0.2s ease;
}

.preview-btn:hover {
    background: var(--accent-color, var(--color-accent));
}

.customizer-controls {
    background: var(--color-background);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.customizer-controls .control-group {
    margin-bottom: 1rem;
}

.customizer-controls label {
    display: block;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.customizer-controls input {
    width: 100%;
    padding: 0.5rem;
    border: 2px solid var(--color-border);
    border-radius: 6px;
    background: var(--color-card);
}

.customizer-controls input[type="color"] {
    height: 40px;
    cursor: pointer;
}

.customizer-controls input[type="range"] {
    cursor: pointer;
}

.preset-themes {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

.preset-themes h5 {
    margin: 0 0 0.5rem 0;
    color: var(--color-primary);
    font-size: 0.9rem;
}

.preset-themes button {
    padding: 0.5rem 0.75rem;
    background: var(--color-muted);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.8rem;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    transition: all 0.2s ease;
}

.preset-themes button:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.css-output {
    background: var(--color-code-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.css-output h5 {
    margin: 0 0 1rem 0;
    color: var(--color-primary);
}

.variables-examples {
    background: var(--color-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.variables-examples h4 {
    margin: 0 0 1.5rem 0;
    color: var(--color-primary);
}

.example-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.example-card {
    background: var(--color-background);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.example-card h5 {
    margin: 0 0 1rem 0;
    color: var(--color-primary);
}

.calc-demo,
.fallback-demo,
.inheritance-demo {
    margin-bottom: 1rem;
}

.calc-element {
    --base-width: 100px;
    background: var(--color-secondary);
    color: white;
    padding: 1rem;
    border-radius: 6px;
    text-align: center;
    font-weight: 600;
    width: calc(var(--base-width) * 2);
    height: calc(var(--base-width) / 2);
    display: flex;
    align-items: center;
    justify-content: center;
}

.fallback-element {
    background: var(--custom-color, #ff6b6b);
    color: var(--text-color, white);
    padding: 1rem;
    border-radius: 6px;
    text-align: center;
    font-weight: 600;
}

.parent-element {
    --local-color: #3498db;
    background: var(--local-color);
    color: white;
    padding: 1rem;
    border-radius: 6px;
    font-weight: 600;
}

.child-element {
    background: var(--local-color);
    opacity: 0.8;
    margin: 0.5rem;
    padding: 0.75rem;
    border-radius: 4px;
    font-size: 0.9rem;
}

.code-snippet {
    background: var(--color-code-bg);
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    margin-top: 1rem;
}

.code-snippet code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.4;
    color: var(--color-text);
}

/* ==========================================================================
   Modern Features Section
   ========================================================================== */

.modern-features-section {
    background: var(--color-surface);
    border-radius: 16px;
    padding: 2rem;
    border: 2px solid var(--color-border);
}

.modern-features-grid {
    margin-top: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.feature-demo {
    background: var(--color-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.feature-demo h4 {
    margin: 0 0 1.5rem 0;
    color: var(--color-primary);
}

.container-demo {
    margin-bottom: 1.5rem;
}

.resizable-container {
    container-type: inline-size;
    background: var(--color-background);
    border: 2px dashed var(--color-border);
    border-radius: 8px;
    padding: 1rem;
    width: 400px;
    transition: width 0.3s ease;
    margin-bottom: 1rem;
}

.container-content {
    background: var(--color-primary);
    color: white;
    padding: 1.5rem;
    border-radius: 6px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

@container (max-width: 300px) {
    .container-content {
        padding: 1rem;
    }
    .container-content h5 {
        font-size: 1rem;
    }
    .container-content p {
        font-size: 0.85rem;
    }
}

.resize-controls {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.resize-controls button {
    padding: 0.5rem 1rem;
    background: var(--color-muted);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.resize-controls button:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* Subgrid Demo */
.subgrid-demo {
    margin-bottom: 1.5rem;
}

.grid-parent {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: auto auto auto;
    gap: 1rem;
}

.grid-item {
    display: grid;
    grid-row: span 3;
    grid-template-rows: subgrid;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 1rem;
    text-align: center;
}

.grid-item h5 {
    margin: 0;
    color: var(--color-primary);
    font-size: 1rem;
    align-self: start;
}

.grid-item p {
    margin: 0;
    color: var(--color-text-light);
    font-size: 0.85rem;
    align-self: center;
}

.grid-item button {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.8rem;
    align-self: end;
}

/* :has() Selector Demo */
.has-selector-demo {
    margin-bottom: 1.5rem;
}

.form-example {
    background: var(--color-background);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    margin-bottom: 1rem;
}

.form-field {
    margin-bottom: 1rem;
    padding: 1rem;
    border: 2px solid transparent;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.form-field:has(:focus) {
    background: rgba(52, 152, 219, 0.05);
    border-color: var(--color-primary);
}

.form-field:has(:invalid) {
    border-color: var(--color-warning);
}

.form-field label {
    display: block;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.form-field input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 1rem;
}

.form-field input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.error-message {
    display: none;
    color: var(--color-warning);
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

.form-field:has(:invalid) .error-message {
    display: block;
}

/* Logical Properties Demo */
.logical-properties-demo {
    margin-bottom: 1.5rem;
}

.writing-modes {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.writing-mode {
    flex: 1;
    background: var(--color-background);
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    margin-inline-start: 20px;
    margin-inline-end: 20px;
    margin-block-start: 10px;
    margin-block-end: 10px;
    inline-size: 200px;
    block-size: 150px;
    overflow: auto;
}

.writing-mode h5 {
    margin: 0 0 0.5rem 0;
    color: var(--color-primary);
}

.writing-mode p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.writing-mode.horizontal-tb {
    writing-mode: horizontal-tb;
}

.writing-mode.vertical-rl {
    writing-mode: vertical-rl;
}

.code-example {
    background: var(--color-code-bg);
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--color-border);
}

.code-example code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.4;
    color: var(--color-text);
    white-space: pre;
}

/* ==========================================================================
   Performance Section
   ========================================================================== */

.performance-section {
    background: var(--color-surface);
    border-radius: 16px;
    padding: 2rem;
    border: 2px solid var(--color-border);
}

.performance-demos {
    margin-top: 2rem;
    display: grid;
    gap: 2rem;
}

.performance-tips {
    display: grid;
    gap: 2rem;
}

.tip-card {
    background: var(--color-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.tip-card h4 {
    margin: 0 0 1rem 0;
    color: var(--color-primary);
}

.performance-example {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.good-example,
.bad-example {
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--color-border);
}

.good-example {
    background: rgba(46, 204, 113, 0.1);
    border-color: var(--color-success);
}

.bad-example {
    background: rgba(231, 76, 60, 0.1);
    border-color: var(--color-warning);
}

.good-example h5,
.bad-example h5 {
    margin: 0 0 0.5rem 0;
    font-size: 0.9rem;
}

.good-example code,
.bad-example code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.4;
    display: block;
    white-space: pre;
}

.animation-performance {
    display: grid;
    gap: 1rem;
}

.demo-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.animation-good,
.animation-bad {
    background: var(--color-background);
    padding: 2rem;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    text-align: center;
}

.animated-element {
    background: var(--color-primary);
    color: white;
    padding: 1rem;
    border-radius: 6px;
    font-weight: 600;
    margin: 0 auto;
    width: 120px;
}

.animated-element.efficient {
    animation: transform-efficient 2s ease-in-out infinite;
}

.animated-element.inefficient {
    animation: layout-inefficient 2s ease-in-out infinite;
}

@keyframes transform-efficient {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(30px); }
}

@keyframes layout-inefficient {
    0%, 100% { margin-left: 0; }
    50% { margin-left: 30px; }
}

.performance-tips-list ul {
    margin: 0;
    padding-left: 1.5rem;
}

.performance-tips-list li {
    margin-bottom: 0.5rem;
    color: var(--color-text-light);
}

.performance-tips-list code {
    font-family: var(--font-mono);
    background: var(--color-muted);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    color: var(--color-primary);
    font-weight: 600;
}

.responsive-performance {
    display: grid;
    gap: 1rem;
}

.performance-metrics {
    background: var(--color-background);
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.metric {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.metric-label {
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin-bottom: 0.25rem;
}

.metric-value {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-primary);
}

.optimization-tips ul {
    margin: 0;
    padding-left: 1.5rem;
}

.optimization-tips li {
    margin-bottom: 0.5rem;
    color: var(--color-text-light);
}

/* CSS Architecture */
.css-architecture {
    background: var(--color-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.css-architecture h4 {
    margin: 0 0 1.5rem 0;
    color: var(--color-primary);
}

.architecture-examples {
    display: grid;
    gap: 2rem;
}

.methodology {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    background: var(--color-background);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.methodology h5 {
    grid-column: 1 / -1;
    margin: 0 0 1rem 0;
    color: var(--color-primary);
}

/* BEM Example */
.card {
    background: var(--color-card);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.card--featured {
    border: 2px solid var(--color-primary);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.card__header {
    background: var(--color-primary);
    color: white;
    padding: 1rem;
}

.card__title {
    margin: 0;
    font-size: 1.1rem;
}

.card__body {
    padding: 1rem;
}

.card__text {
    margin: 0;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.card__footer {
    padding: 1rem;
    border-top: 1px solid var(--color-border);
}

.card__button {
    background: var(--color-muted);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.card__button--primary {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.card__button:hover {
    transform: translateY(-1px);
}

/* Utility Classes */
.p-4 { padding: 1rem; }
.bg-blue-500 { background-color: #3b82f6; }
.text-white { color: white; }
.rounded-lg { border-radius: 0.5rem; }
.shadow-lg { box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1); }
.text-xl { font-size: 1.25rem; }
.font-bold { font-weight: 700; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.rounded { border-radius: 0.25rem; }
.hover\:bg-gray-100:hover { background-color: #f7fafc; }

/* ==========================================================================
   Final Challenge
   ========================================================================== */

.final-challenge {
    background: var(--color-surface);
    border-radius: 16px;
    padding: 2rem;
    border: 2px solid var(--color-border);
}

.challenge-container {
    margin-top: 2rem;
}

.challenge-brief {
    background: var(--color-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    margin-bottom: 2rem;
}

.challenge-brief h4 {
    margin: 0 0 1rem 0;
    color: var(--color-primary);
}

.requirements {
    background: var(--color-muted);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
}

.requirements h5 {
    margin: 0 0 0.5rem 0;
    color: var(--color-primary);
}

.requirements ul {
    margin: 0;
    padding-left: 1.5rem;
}

.requirements li {
    margin-bottom: 0.25rem;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.challenge-workspace {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.challenge-editor,
.challenge-preview {
    background: var(--color-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.challenge-editor h5,
.challenge-preview h5 {
    margin: 0 0 1rem 0;
    color: var(--color-primary);
}

#final-challenge-css {
    width: 100%;
    height: 400px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.4;
    padding: 1rem;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-code-bg);
    color: var(--color-text);
    resize: vertical;
}

#final-challenge-css:focus {
    outline: none;
    border-color: var(--color-primary);
}

.test-solution-btn {
    background: var(--color-success);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    margin-top: 1rem;
    transition: all 0.2s ease;
}

.test-solution-btn:hover {
    background: var(--color-primary);
    transform: translateY(-1px);
}

.challenge-result {
    background: var(--color-background);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    margin-bottom: 1rem;
}

.card-showcase {
    background: var(--card-bg, white);
    border-radius: var(--card-border-radius, 8px);
    padding: var(--card-padding, 1.5rem);
    box-shadow: 0 2px 8px var(--card-shadow, rgba(0,0,0,0.1));
    color: var(--text-color, #333);
    transition: all 0.3s ease;
}

.card-showcase:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px var(--card-shadow, rgba(0,0,0,0.15));
}

.card-showcase__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.card-showcase__header h6 {
    margin: 0;
    color: var(--primary-color, var(--color-primary));
    font-size: 1.1rem;
}

.card-showcase__badge {
    background: var(--primary-color, var(--color-primary));
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.card-showcase__body {
    margin-bottom: 1.5rem;
}

.card-showcase__body p {
    margin: 0;
    color: var(--text-color, var(--color-text-light));
    line-height: 1.5;
}

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

.card-showcase__button {
    background: var(--primary-color, var(--color-primary));
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: var(--card-border-radius, 8px);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.card-showcase__button:hover {
    background: var(--secondary-color, var(--color-secondary));
    transform: translateY(-1px);
}

.challenge-feedback {
    background: var(--color-muted);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    text-align: center;
}

.challenge-feedback.success {
    background: var(--color-success);
    color: white;
    border-color: var(--color-success);
}

.challenge-feedback h6 {
    margin: 0 0 0.5rem 0;
}

.challenge-feedback p {
    margin: 0;
    font-size: 0.9rem;
}

.challenge-feedback code {
    font-family: var(--font-mono);
    background: rgba(255,255,255,0.2);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 1200px) {
    .animation-demo,
    .playground-area,
    .customizer-content,
    .challenge-workspace {
        grid-template-columns: 1fr;
    }
    
    .transform-types {
        grid-template-columns: 1fr;
    }
    
    .performance-example,
    .demo-comparison,
    .methodology {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .demo-tabs {
        flex-direction: column;
    }
    
    .demo-tab {
        text-align: left;
    }
    
    .hover-cards,
    .click-buttons,
    .cube-controls,
    .resize-controls {
        grid-template-columns: 1fr;
        flex-direction: column;
    }
    
    .modern-features-grid {
        grid-template-columns: 1fr;
    }
    
    .grid-parent {
        grid-template-columns: 1fr;
    }
    
    .writing-modes {
        flex-direction: column;
    }
    
    .performance-metrics {
        flex-direction: column;
        gap: 1rem;
    }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
    .demo-tabs,
    .animation-controls,
    .cube-controls,
    .resize-controls,
    .preset-themes,
    .test-solution-btn {
        display: none;
    }
    
    .animation-demo,
    .feature-demo {
        display: block !important;
        page-break-inside: avoid;
        margin-bottom: 2rem;
    }
    
    .code-block,
    .code-example,
    .code-snippet {
        border: 1px solid #000;
        background: #f9f9f9 !important;
    }
}

/* ==========================================================================
   Dark Mode Enhancements
   ========================================================================== */

@media (prefers-color-scheme: dark) {
    .cube {
        filter: brightness(0.9);
    }
    
    .face {
        background: var(--color-secondary);
    }
    
    .preview-card {
        box-shadow: 0 2px 8px rgba(255,255,255,0.1);
    }
}

/* ==========================================================================
   Accessibility Enhancements
   ========================================================================== */

.demo-tab:focus,
.replay-btn:focus,
.click-btn:focus,
.test-solution-btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .animation-box,
    .complex-animation,
    .animated-element,
    .transform-box,
    .cube,
    .card-showcase {
        animation: none !important;
        transition: none !important;
    }
    
    .hover-card:hover,
    .transform-box:hover,
    .card-showcase:hover {
        transform: none !important;
    }
}