styles.css

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #333;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

/* Header */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.2em;
    opacity: 0.9;
}

/* Controls Panel */
.controls-panel {
    background: #f8f9fa;
    padding: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    border-bottom: 2px solid #e0e0e0;
    align-items: center;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.control-group label {
    font-weight: 600;
    color: #555;
}

.control-group select {
    padding: 8px 12px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
    background: white;
    cursor: pointer;
    transition: border-color 0.3s;
}

.control-group select:hover {
    border-color: #667eea;
}

.btn {
    padding: 8px 16px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s;
}

.btn:hover {
    background: #764ba2;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn:active {
    transform: translateY(0);
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 20px;
    padding: 20px;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* Skill Tree Container */
.skill-tree-container {
    position: relative;
    background: #fafafa;
    border-radius: 10px;
    padding: 20px;
    border: 2px solid #e0e0e0;
}

#skill-tree-canvas {
    width: 100%;
    height: 600px;
    border-radius: 8px;
    background: white;
}

/* SVG Styles for nodes and connections */
.node-circle {
    cursor: pointer;
    transition: all 0.3s;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.node-circle:hover {
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
    transform: scale(1.1);
}

.node-circle.selected {
    stroke: #333;
    stroke-width: 4;
    filter: drop-shadow(0 6px 12px rgba(0, 0, 0, 0.4));
}

.node-circle.unlocked {
    opacity: 1;
}

.node-circle.locked {
    opacity: 0.5;
    filter: grayscale(0.5);
}

.node-text {
    pointer-events: none;
    font-weight: 600;
    font-size: 12px;
    text-anchor: middle;
}

.connection-line {
    stroke: #bbb;
    stroke-width: 2;
    opacity: 0.6;
    transition: all 0.3s;
}

.connection-line.strong {
    stroke-width: 3;
    stroke: #667eea;
}

.connection-line.medium {
    stroke-width: 2;
    stroke: #95a5ff;
}

.connection-line.weak {
    stroke-width: 1;
    stroke: #ccc;
}

.connection-line.highlighted {
    stroke: #FF6B6B;
    stroke-width: 4;
    opacity: 1;
}

/* Legend */
.legend {
    margin-top: 20px;
    padding: 15px;
    background: white;
    border-radius: 8px;
    border: 2px solid #e0e0e0;
}

.legend h3 {
    margin-bottom: 10px;
    color: #667eea;
    font-size: 1.1em;
}

.legend-items {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9em;
}

.legend-color {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid #333;
}

/* Info Panel */
.info-panel {
    background: #fafafa;
    border-radius: 10px;
    padding: 20px;
    border: 2px solid #e0e0e0;
    overflow-y: auto;
    max-height: 800px;
}

.info-content {
    animation: fadeIn 0.3s;
}

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

.info-content h2 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.8em;
}

.info-content h3 {
    color: #764ba2;
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 1.3em;
}

.info-content p {
    line-height: 1.6;
    margin-bottom: 15px;
    color: #555;
}

.info-content ul {
    list-style-position: inside;
    margin-bottom: 15px;
}

.info-content li {
    padding: 5px 0;
    color: #666;
}

.info-section {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 2px solid #e0e0e0;
}

.sub-region-item {
    background: white;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.sub-region-item h4 {
    color: #667eea;
    margin-bottom: 5px;
}

.sub-region-item p {
    font-size: 0.9em;
    margin-bottom: 8px;
}

.sub-region-item ul {
    font-size: 0.85em;
    margin-left: 20px;
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: #ff4757;
    color: white;
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.close-btn:hover {
    background: #ff3838;
    transform: rotate(90deg);
}

.tip {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 12px;
    margin-top: 15px;
    border-radius: 4px;
    font-weight: 600;
    color: #856404;
}

/* Progress Tracker */
.progress-tracker {
    margin-top: 20px;
    padding: 20px;
    background: white;
    border-radius: 8px;
    border: 2px solid #e0e0e0;
}

.progress-tracker h3 {
    color: #667eea;
    margin-bottom: 15px;
}

.progress-bar {
    width: 100%;
    height: 30px;
    background: #e0e0e0;
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transition: width 0.5s ease;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

#progress-text {
    text-align: center;
    color: #555;
    font-weight: 600;
}

/* Footer */
.footer {
    background: #f8f9fa;
    padding: 20px;
    text-align: center;
    color: #666;
    border-top: 2px solid #e0e0e0;
}

.footer p {
    margin: 5px 0;
}

.footer a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

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

/* Animations */
@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.pulse {
    animation: pulse 2s infinite;
}

/* Tooltip */
.tooltip {
    position: absolute;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 12px;
    border-radius: 5px;
    font-size: 12px;
    pointer-events: none;
    z-index: 1000;
    white-space: nowrap;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.8em;
    }

    .controls-panel {
        flex-direction: column;
        align-items: stretch;
    }

    .control-group {
        flex-direction: column;
        align-items: stretch;
    }

    .legend-items {
        grid-template-columns: 1fr;
    }

    #skill-tree-canvas {
        height: 400px;
    }
}