:root {
    --primary-color: #2563eb;
    --secondary-color: #3b82f6;
    --background-color: #f8fafc;
    --text-color: #1e293b;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

main {
    margin-top: 5rem;
    padding: 2rem;
}

.instructions {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    text-align: center;
    max-width: 1200px;
    margin: 0 auto 2rem;
}

.instructions h2 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1rem;
}

.instructions p {
    color: #64748b;
    max-width: 600px;
    margin: 0 auto;
}

.practice-container {
    display: flex;
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
}

.alphabet-section {
    flex: 1;
    max-height: 80vh;
    overflow-y: auto;
    padding-right: 1rem;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) var(--background-color);
}

.alphabet-section::-webkit-scrollbar {
    width: 8px;
}

.alphabet-section::-webkit-scrollbar-track {
    background: var(--background-color);
}

.alphabet-section::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: 20px;
}

.quick-alphabet {
    position: sticky;
    top: 0;
    background: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 1rem;
    z-index: 10;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.letter-quick-link {
    min-width: 40px;
    height: 40px;
    padding: 0 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    white-space: nowrap;
    font-size: 0.85rem;
    text-align: center;
}

.letter-quick-link:hover {
    transform: translateY(-2px);
    background: var(--secondary-color);
}

/* Mobile responsiveness for quick navigation */
@media (max-width: 768px) {
    .quick-alphabet {
        padding: 0.75rem;
        gap: 0.4rem;
    }
    
    .letter-quick-link {
        min-width: 35px;
        height: 35px;
        padding: 0 0.5rem;
        font-size: 0.75rem;
    }
    
    /* Stack navigation items more efficiently on small screens */
    .quick-alphabet {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
        max-height: 200px;
        overflow-y: auto;
    }
}

@media (max-width: 480px) {
    .letter-quick-link {
        font-size: 0.7rem;
        min-width: 30px;
        height: 30px;
        padding: 0 0.4rem;
    }
    
    .quick-alphabet {
        grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
    }
}

.alphabet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    padding: 1rem 0;
}

/* Better responsive behavior for cards */
@media (max-width: 768px) {
    .alphabet-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .alphabet-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

.letter-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: var(--transition);
    text-align: center;
    cursor: pointer;
    min-height: 280px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.letter-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.letter-card.selected {
    border: 3px solid var(--primary-color);
    transform: translateY(-5px);
}

.letter {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
    hyphens: auto;
    text-align: center;
    line-height: 1.2;
}

/* Responsive font sizing for longer text */
.letter {
    font-size: clamp(1.2rem, 4vw, 2.5rem);
}

/* Better approach: Add classes to HTML or use CSS for common long phrases */
.letter-card .letter {
    max-width: 100%;
    word-break: break-word;
}

/* For mobile devices, ensure text fits */
@media (max-width: 768px) {
    .letter {
        font-size: clamp(1rem, 3vw, 1.8rem);
    }
    
    .letter-card {
        padding: 1rem;
        min-height: 260px;
    }
}

@media (max-width: 480px) {
    .letter {
        font-size: clamp(0.9rem, 2.5vw, 1.4rem);
    }
    
    .letter-card {
        min-height: 240px;
    }
}

/* Additional spacing for better layout with longer text */
.sign-image {
    width: 150px;
    height: 150px;
    margin: 1rem auto;
    border-radius: var(--border-radius);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f8fafc;
}

.sign-image img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: var(--border-radius);
}

.letter-card p {
    color: #64748b;
    font-size: 0.9rem;
    margin-top: 1rem;
}

.webcam-section {
    position: sticky;
    top: 7rem;
    width: 400px;
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    height: fit-content;
}

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

.webcam-section p {
    color: #64748b;
    text-align: center;
    margin-bottom: 1rem;
}

.video-container {
    position: relative;
    width: 100%;
    border-radius: var(--border-radius);
    overflow: hidden;
    aspect-ratio: 4/3;
}

#webcam {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
    -moz-transform: rotateY(180deg);
    border-radius: var(--border-radius);
    background-color: #f1f5f9;
}

.output_canvas {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
    -moz-transform: rotateY(180deg);
}

.output {
    background-color: #000000;
    color: #ffffff;
    padding: 1.2rem;
    border-radius: var(--border-radius);
    margin-top: 1rem;
    font-weight: 600;
    font-size: 1.1rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.output.success {
    background-color: #15803d;
    color: #ffffff;
    border: none;
}

.output.error {
    background-color: #000000;
    color: #ffffff;
    border: none;
}

.output.neutral {
    background-color: #000000;
    color: #ffffff;
    border: none;
}

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

.output.success {
    animation: successPulse 0.5s ease-in-out;
}

.control-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    margin-top: 1rem;
}

.control-btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

footer {
    background-color: white;
    padding: 2rem;
    text-align: center;
    margin-top: 4rem;
    box-shadow: 0 -1px 3px rgba(0,0,0,0.1);
}

footer p {
    color: #64748b;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 1024px) {
    .practice-container {
        flex-direction: column;
    }

    .webcam-section {
        position: relative;
        width: 100%;
        top: 0;
        margin-bottom: 2rem;
    }

    .alphabet-section {
        max-height: none;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        padding: 0.5rem 2rem;
    }

    .menu-toggle {
        display: flex;
        order: 2;
    }

    nav {
        display: none;
        position: absolute;
        top: 100%;
        right: 0;
        width: 200px;
        background-color: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        gap: 0.5rem;
        border-radius: 0 0 var(--border-radius) var(--border-radius);
    }

    nav.active {
        display: flex;
    }

    nav a {
        width: 100%;
        text-align: left;
        padding: 0.75rem 1rem;
    }

    .quick-alphabet {
        grid-template-columns: repeat(auto-fill, minmax(35px, 1fr));
    }

    .letter-quick-link {
        width: 35px;
        height: 35px;
        font-size: 0.9rem;
    }
}

.correct-letter {
    animation: successPulse 1s ease-in-out;
}

/* Utility classes for handling very long text in cards */
.letter-card.long-text .letter {
    font-size: 1.5rem !important;
    line-height: 1.1;
}

.letter-card.very-long-text .letter {
    font-size: 1.2rem !important;
    line-height: 1.1;
    margin-bottom: 0.5rem;
}

/* Enhanced text wrapping for all scenarios */
.letter-card .letter {
    overflow-wrap: anywhere;
    word-break: break-word;
    hyphens: auto;
}