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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-card: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent: #22c55e;
    --accent-dim: rgba(34, 197, 94, 0.2);
    --border: #2a2a2a;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 3rem;
}

.back-link {
    display: inline-block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--accent);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Demo Area */
.demo-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

@media (max-width: 768px) {
    .demo-area {
        grid-template-columns: 1fr;
    }
}

/* Canvas Section */
.canvas-section {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.canvas-container {
    position: relative;
    width: 280px;
    height: 280px;
    border: 2px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    background: white;
}

#drawCanvas {
    display: block;
    cursor: crosshair;
    touch-action: none;
}

.canvas-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    transition: opacity 0.3s;
}

.canvas-overlay span {
    color: #ccc;
    font-size: 1.2rem;
    font-weight: 500;
}

.clear-btn {
    margin-top: 1rem;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.clear-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--accent);
}

/* Results Section */
.results-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.prediction-display {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
}

.prediction-label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.prediction-digit {
    display: block;
    font-size: 5rem;
    font-weight: 700;
    line-height: 1;
    color: var(--accent);
    transition: transform 0.2s;
}

.prediction-digit.animate {
    transform: scale(1.1);
}

.confidence {
    display: block;
    margin-top: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Probabilities */
.probabilities {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
}

.probabilities h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.prob-bars {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.prob-bar-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: opacity 0.2s;
}

.prob-bar-container.predicted .prob-label {
    color: var(--accent);
    font-weight: 600;
}

.prob-bar-container.predicted .prob-bar {
    background: var(--accent);
}

.prob-label {
    width: 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.prob-bar-bg {
    flex: 1;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
}

.prob-bar {
    height: 100%;
    width: 0%;
    background: var(--text-secondary);
    border-radius: 4px;
    transition: width 0.3s ease-out;
}

.prob-value {
    width: 3rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: right;
}

/* Info Section */
.info-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

@media (max-width: 768px) {
    .info-section {
        grid-template-columns: 1fr;
    }
}

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

.info-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.info-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.info-card ul {
    list-style: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.info-card li {
    padding-left: 1.25rem;
    position: relative;
    margin-bottom: 0.5rem;
}

.info-card li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
}

.code-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.2s;
}

.code-link:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Footer */
footer {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

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