:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --secondary-color: #6b7280;
    --secondary-hover: #4b5563;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --success-color: #10b981;
}

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

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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 8px;
    color: var(--primary-color);
}

header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Main Layout */
main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

@media (min-width: 768px) {
    main {
        grid-template-columns: 320px 1fr;
    }
}

/* Input Section */
.input-section {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.canvas-container {
    position: relative;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

#drawingCanvas {
    display: block;
    width: 100%;
    height: auto;
    cursor: crosshair;
    touch-action: none;
}

.canvas-hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-muted);
    font-size: 0.9rem;
    pointer-events: none;
    opacity: 0.5;
}

#drawingCanvas.drawing + .canvas-hint {
    display: none;
}

/* Controls */
.controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.controls .btn-primary {
    grid-column: span 2;
}

.btn {
    padding: 12px 16px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn:hover:not(:disabled) {
    transform: translateY(-1px);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--secondary-hover);
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-hover);
}

/* Options */
.options {
    background: var(--card-bg);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 0.9rem;
}

.options label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.options input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

.options select {
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.9rem;
}

/* Result Section */
.result-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
}

.result-section h2 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: 12px;
}

.result-item {
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 8px;
    text-align: center;
    transition: all 0.2s;
    cursor: pointer;
}

.result-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}

.result-item .char {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 4px;
}

.result-item .score {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.result-item .stroke-info {
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 2px;
    opacity: 0.7;
}

.result-item .rank {
    position: absolute;
    top: -8px;
    left: -8px;
    width: 22px;
    height: 22px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 0.7rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-item {
    position: relative;
}

.result-item:nth-child(1) { border-color: #ffd700; background: linear-gradient(135deg, #fff9e6 0%, #ffffff 100%); }
.result-item:nth-child(2) { border-color: #c0c0c0; background: linear-gradient(135deg, #f5f5f5 0%, #ffffff 100%); }
.result-item:nth-child(3) { border-color: #cd7f32; background: linear-gradient(135deg, #faf0e6 0%, #ffffff 100%); }

.result-placeholder {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
}

.loading.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

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

/* Footer */
footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

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

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

.result-item {
    animation: fadeIn 0.3s ease-out forwards;
}

.result-item:nth-child(1) { animation-delay: 0.05s; }
.result-item:nth-child(2) { animation-delay: 0.1s; }
.result-item:nth-child(3) { animation-delay: 0.15s; }
.result-item:nth-child(4) { animation-delay: 0.2s; }
.result-item:nth-child(5) { animation-delay: 0.25s; }
.result-item:nth-child(6) { animation-delay: 0.3s; }
.result-item:nth-child(7) { animation-delay: 0.35s; }
.result-item:nth-child(8) { animation-delay: 0.4s; }
.result-item:nth-child(9) { animation-delay: 0.45s; }
.result-item:nth-child(10) { animation-delay: 0.5s; }

/* Mobile adjustments */
@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 1.4rem;
    }
    
    .results-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
    }
    
    .result-item .char {
        font-size: 2rem;
    }
}