/* Timeline of Calculus History - Styles */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background: aliceblue;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 8px 20px 20px 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 8px;
}

header h1 {
    color: #2c3e50;
    font-size: 1.6rem;
    margin-bottom: 2px;
}

header p {
    color: #666;
    font-size: 0.95rem;
}

/* Filter Controls */
.filter-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    margin-bottom: 8px;
    padding: 6px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.filter-btn {
    padding: 4px 10px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.2s ease;
    color: white;
}

.filter-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.filter-btn.active {
    box-shadow: 0 0 0 2px #2c3e50;
}

/* Category button colors */
.filter-btn[data-category="all"] { background: #2c3e50; }
.filter-btn[data-category="Foundations"] { background: #8B4513; }
.filter-btn[data-category="Pre-Calculus"] { background: #DAA520; color: #333; }
.filter-btn[data-category="Foundations of Calculus"] { background: #228B22; }
.filter-btn[data-category="Applications"] { background: #4169E1; }
.filter-btn[data-category="Expansion"] { background: #9932CC; }
.filter-btn[data-category="Education"] { background: #DC143C; }
.filter-btn[data-category="Advanced Topics"] { background: #008B8B; }
.filter-btn[data-category="Rigor"] { background: #FF6347; }
.filter-btn[data-category="Integration"] { background: #6B8E23; }
.filter-btn[data-category="Technology"] { background: #1E90FF; }
.filter-btn[data-category="Demographics"] { background: #FF69B4; }

/* Navigation Controls */
.nav-controls {
    display: flex;
    gap: 6px;
    justify-content: center;
    margin-bottom: 8px;
}

.nav-btn {
    padding: 4px 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    background: white;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    background: #f0f0f0;
    border-color: #999;
}

/* Timeline Container */
#timeline {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding-left: 80px;
    padding-right: 80px;
    overflow: hidden;
}

/* Override vis-timeline clipping */
.vis-timeline {
    overflow: visible !important;
    border: none !important;
}

.vis-panel.vis-center {
    overflow: visible !important;
}

.vis-item .vis-item-overflow {
    overflow: visible !important;
}

/* Timeline item styles */
.vis-item {
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.vis-item.vis-selected {
    box-shadow: 0 0 0 2px #2c3e50;
}

/* Tooltip styles */
.vis-tooltip {
    background: #2c3e50 !important;
    color: white !important;
    padding: 10px 15px !important;
    border-radius: 8px !important;
    font-size: 13px !important;
    max-width: 300px !important;
    line-height: 1.4 !important;
    word-wrap: break-word !important;
    overflow-wrap: break-word !important;
    white-space: normal !important;
    box-sizing: border-box !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3) !important;
}

.vis-tooltip div {
    max-width: 280px !important;
    word-wrap: break-word !important;
    overflow-wrap: break-word !important;
    white-space: normal !important;
}

/* Event Details Panel */
.event-details-panel {
    margin-top: 12px;
    padding: 12px 16px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.event-details-panel .placeholder {
    color: #999;
    font-style: italic;
    font-size: 0.9rem;
    text-align: center;
}

.event-details-panel .event-header {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.event-details-panel .event-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: #2c3e50;
}

.event-details-panel .event-date {
    font-size: 0.9rem;
    color: #666;
}

.event-details-panel .event-category {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    color: white;
}

.event-details-panel .event-description {
    font-size: 0.9rem;
    line-height: 1.5;
    color: #333;
}

/* Instructions */
.instructions {
    text-align: center;
    font-size: 0.8rem;
    color: #666;
    margin-top: 6px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    header h1 {
        font-size: 1.3rem;
    }

    #timeline {
        padding-left: 40px;
        padding-right: 40px;
    }

    .event-details-panel .event-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }
}