/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

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

/* Hero Section */
.hero {
    text-align: center;
    padding: 60px 20px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    margin-bottom: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: fadeInDown 0.8s ease-out;
}

.title {
    font-size: 4rem;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    animation: pulse 2s ease-in-out infinite;
}

.emoji {
    display: inline-block;
    animation: bounce 1s ease-in-out infinite;
}

.subtitle {
    font-size: 1.5rem;
    color: #666;
    margin-bottom: 10px;
}

.tagline {
    font-size: 1.2rem;
    color: #888;
    font-style: italic;
}

/* Preview Section */
.preview {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    animation: fadeIn 1s ease-out;
}

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

.robot-icon {
    font-size: 8rem;
    margin-bottom: 30px;
    animation: float 3s ease-in-out infinite;
}

.direction-indicators {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.direction-row {
    display: flex;
    gap: 100px;
}

.direction {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    color: white;
    min-width: 100px;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.direction:hover {
    transform: scale(1.1);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.5);
}

.direction .arrow {
    font-size: 2.5rem;
    font-weight: bold;
}

.direction .label {
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
}

/* Section Styles */
section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 0.8s ease-out;
}

h2 {
    font-size: 2.5rem;
    color: #667eea;
    margin-bottom: 30px;
    text-align: center;
    font-weight: 700;
}

/* Difficulty Modes */
.difficulty-modes {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    color: white;
}

.difficulty-modes h2 {
    color: white;
}

.difficulty-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.difficulty-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.difficulty-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
}

.difficulty-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.difficulty-badge {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    margin: 0 auto 20px;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.difficulty-card h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.difficulty-card p {
    color: #666;
    margin-bottom: 10px;
}

.difficulty-hint {
    background: #f0f0f0;
    padding: 10px 15px;
    border-radius: 10px;
    font-size: 0.9rem;
    color: #555;
    font-style: italic;
    margin-top: 15px;
}

/* How to Play */
.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.step {
    display: flex;
    gap: 20px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 15px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.step:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.step-number {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
}

.step-content h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.step-content p {
    color: #666;
}

/* Controls */
.control-section-title {
    color: #667eea;
    margin: 30px 0 20px;
    font-size: 1.5rem;
    text-align: left;
    padding-bottom: 10px;
    border-bottom: 3px solid #667eea;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.controls-grid-small {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.control-card {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 15px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.control-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.control-icon {
    font-size: 4rem;
    margin-bottom: 15px;
    color: #667eea;
}

.control-card h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.control-card p {
    color: #666;
    margin-bottom: 15px;
}

.tilt-indicator {
    background: #667eea;
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    display: inline-block;
}

.control-tip {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 15px 20px;
    border-radius: 10px;
    color: #856404;
    font-size: 1.1rem;
    text-align: center;
}

/* Features */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    text-align: center;
    padding: 30px;
    background: #f8f9fa;
    border-radius: 15px;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: scale(1.05);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.feature-card h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.feature-card p {
    color: #666;
}

/* Installation */
.code-block {
    background: #1e1e1e;
    border-radius: 10px;
    overflow: hidden;
    margin-top: 20px;
}

.code-header {
    background: #2d2d2d;
    padding: 10px 20px;
    border-bottom: 1px solid #444;
}

.code-title {
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
}

pre {
    margin: 0;
    padding: 20px;
    overflow-x: auto;
}

code {
    color: #d4d4d4;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Game States */
.states-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.state-card {
    text-align: center;
    padding: 25px;
    background: #f8f9fa;
    border-radius: 15px;
    transition: transform 0.3s ease;
}

.state-card:hover {
    transform: translateY(-5px);
}

.state-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    display: block;
}

.state-card h3 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.state-card p {
    color: #666;
    font-size: 0.95rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px;
    color: white;
    margin-top: 30px;
}

.footer p {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.heart {
    color: #ff6b6b;
    animation: heartbeat 1.5s ease-in-out infinite;
}

.tech-stack {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.02);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes heartbeat {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .title {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.2rem;
    }

    .robot-icon {
        font-size: 5rem;
    }

    .direction-row {
        gap: 40px;
    }

    h2 {
        font-size: 2rem;
    }

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

    section {
        padding: 25px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .title {
        font-size: 2rem;
    }

    .hero {
        padding: 40px 20px;
    }
}