:root {
    --primary-color: #3a86ff;
    --secondary-color: #8338ec;
    --accent-color: #ff006e;
    --background-color: #f8f9fa;
    --card-bg-color: #ffffff;
    --text-color: #212529;
    --light-gray: #e9ecef;
    --mid-gray: #adb5bd;
    --dark-gray: #495057;
    --success-color: #06d6a0;
    --warning-color: #ffbe0b;
    --phase-1-color: #3a86ff;
    --phase-2-color: #8338ec;
    --phase-3-color: #ff006e;
    --phase-4-color: #fb5607;
    --phase-5-color: #06d6a0;
    
    /* Shadow Variables */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.1);
    --shadow-xl: 0 12px 24px rgba(0,0,0,0.15);
    
    /* Sizing & Spacing */
    --border-radius-sm: 6px;
    --border-radius-md: 10px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    
    /* Animation */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
}

/* Dark Mode Variables */
.dark-mode {
    --primary-color: #4e95ff;
    --secondary-color: #9158f5;
    --accent-color: #ff4690;
    --background-color: #121212;
    --card-bg-color: #1e1e1e;
    --text-color: #e9ecef;
    --light-gray: #2a2a2a;
    --mid-gray: #4a4a4a;
    --dark-gray: #8a8a8a;
}

/* Dark mode specific overrides */
.dark-mode .phase-indicator {
    box-shadow: var(--shadow-lg);
}

.dark-mode .phase-indicator:not([data-phase]) {
    background-color: var(--card-bg-color);
    color: var(--text-color);
}

.dark-mode .timeline-event {
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--light-gray);
    flex-wrap: wrap;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-right: 1rem;
    letter-spacing: -0.5px;
}

.timeline-controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

button {
    background-color: var(--card-bg-color);
    border: 1px solid var(--light-gray);
    border-radius: var(--border-radius-md);
    padding: 0.6rem 1.2rem;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
    color: var(--text-color);
}

button:hover {
    background-color: var(--light-gray);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

button.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(58, 134, 255, 0.3);
}

.view-toggle {
    display: flex;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    background-color: var(--card-bg-color);
}

.view-toggle button {
    border-radius: 0;
    margin: 0;
    border-right: none;
    box-shadow: none;
    position: relative;
    z-index: 1;
    padding: 0.5rem 0.8rem;
    color: var(--dark-gray);
}

.view-toggle button.active {
    color: white;
}

.view-toggle button.active::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--primary-color);
    z-index: -1;
    transition: all var(--transition-normal);
}

.view-toggle button:first-child {
    border-top-left-radius: var(--border-radius-md);
    border-bottom-left-radius: var(--border-radius-md);
}

.view-toggle button:last-child {
    border-top-right-radius: var(--border-radius-md);
    border-bottom-right-radius: var(--border-radius-md);
    border-right: 1px solid var(--light-gray);
}

/* Theme toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--card-bg-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    margin-left: auto;
    margin-right: 0.5rem;
}

.theme-toggle:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.timeline-container {
    position: relative;
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    padding: 2rem;
    min-height: 600px;
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

/* Phase indicators container */
.phases-wrapper {
    margin-bottom: 2rem;
}

.phase-indicators {
    display: flex;
    justify-content: flex-start;
    margin-bottom: 1.5rem;
    position: relative;
    flex-wrap: wrap;
    gap: 1rem;
    width: 100%;
    overflow-x: visible;
    z-index: 10;
}

.phase-indicator {
    background: var(--card-bg-color);
    border-radius: var(--border-radius-xl);
    padding: 0.6rem 1.2rem;
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    min-width: 160px;
    opacity: 1;
    visibility: visible;
}

.phase-indicator small {
    opacity: 0.8;
    font-size: 0.75rem;
    margin-top: 2px;
}

.phase-indicator:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: var(--shadow-lg);
}

.phase-indicator.active {
    color: white;
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-xl);
}

.phase-indicator::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: var(--border-radius-xl);
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
    background: linear-gradient(120deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0) 100%);
}

.phase-indicator:hover::after {
    opacity: 1;
}

.phase-indicator[data-phase="1"] {
    background-color: var(--phase-1-color);
    color: white;
}

.phase-indicator[data-phase="2"] {
    background-color: var(--phase-2-color);
    color: white;
}

.phase-indicator[data-phase="3"] {
    background-color: var(--phase-3-color);
    color: white;
}

.phase-indicator[data-phase="4"] {
    background-color: var(--phase-4-color);
    color: white;
}

.phase-indicator[data-phase="5"] {
    background-color: var(--phase-5-color);
    color: white;
}

.timeline-viewport {
    overflow-x: auto;
    overflow-y: hidden;
    margin-bottom: 1.5rem;
    position: relative;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--mid-gray) var(--light-gray);
    padding: 1rem 0;
    border-radius: var(--border-radius-md);
}

.timeline-viewport::-webkit-scrollbar {
    height: 8px;
}

.timeline-viewport::-webkit-scrollbar-track {
    background: var(--light-gray);
    border-radius: 4px;
}

.timeline-viewport::-webkit-scrollbar-thumb {
    background-color: var(--mid-gray);
    border-radius: 4px;
}

#timeline-wrapper {
    position: relative;
    min-height: 400px;
    min-width: 100%;
    transition: transform 0.5s ease;
    padding: 2rem 0;
}

.timeline-axis {
    position: relative;
    height: 3px;
    background-color: var(--light-gray);
    margin: 2rem 0;
    border-radius: 2px;
}

.timeline-event {
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--card-bg-color);
    border: 3px solid;
    transform: translate(-50%, -50%);
    cursor: pointer;
    z-index: 3;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.timeline-event:hover {
    transform: translate(-50%, -50%) scale(1.5);
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
}

.timeline-event.milestone {
    width: 28px;
    height: 28px;
    background-color: var(--card-bg-color);
    border-width: 4px;
    z-index: 4;
    box-shadow: var(--shadow-md);
}

.timeline-event::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 200%;
    height: 200%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.3);
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.timeline-event:hover::after {
    opacity: 1;
}

.event-label {
    position: absolute;
    white-space: nowrap;
    background-color: var(--card-bg-color);
    padding: 0.5rem 0.8rem;
    border-radius: var(--border-radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    pointer-events: none;
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 5;
    color: var(--text-color);
    max-width: 250px;
    text-overflow: ellipsis;
    overflow: hidden;
}

.timeline-event:hover + .event-label {
    opacity: 1;
    transform: translateY(-5px);
}

.phase-period {
    position: absolute;
    height: 12px;
    border-radius: 6px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
    opacity: 0.3;
    transition: opacity 0.3s ease;
}

.phase-period:hover {
    opacity: 0.6;
}

.phase-period[data-phase="1"] {
    background-color: var(--phase-1-color);
}

.phase-period[data-phase="2"] {
    background-color: var(--phase-2-color);
}

.phase-period[data-phase="3"] {
    background-color: var(--phase-3-color);
}

.phase-period[data-phase="4"] {
    background-color: var(--phase-4-color);
}

.phase-period[data-phase="5"] {
    background-color: var(--phase-5-color);
}

.timeline-event[data-phase="1"] {
    border-color: var(--phase-1-color);
}

.timeline-event[data-phase="2"] {
    border-color: var(--phase-2-color);
}

.timeline-event[data-phase="3"] {
    border-color: var(--phase-3-color);
}

.timeline-event[data-phase="4"] {
    border-color: var(--phase-4-color);
}

.timeline-event[data-phase="5"] {
    border-color: var(--phase-5-color);
}

.timeline-legend {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    padding-top: 1rem;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--dark-gray);
    padding: 0.5rem 1rem;
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.legend-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.legend-marker {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background-color: var(--card-bg-color);
    border: 3px solid var(--primary-color);
}

.legend-marker.milestone {
    width: 18px;
    height: 18px;
    border-width: 4px;
}

.panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    z-index: 1000;
    opacity: 1;
    transition: all var(--transition-normal);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid var(--light-gray);
}

.panel.hidden {
    opacity: 0;
    transform: translate(-50%, -40%);
    pointer-events: none;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid var(--light-gray);
}

.panel-header h3 {
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--text-color);
}

.panel-content {
    padding: 1.5rem;
}

.close-panel {
    background: none;
    border: none;
    box-shadow: none;
    color: var(--dark-gray);
    padding: 0.5rem;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-panel:hover {
    background-color: var(--light-gray);
    transform: none;
}

.event-details h4 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    color: var(--primary-color);
}

.event-details p {
    margin-bottom: 1.2rem;
    color: var(--dark-gray);
    line-height: 1.7;
}

.event-details .date {
    font-weight: 500;
    color: var(--secondary-color);
    display: block;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.event-details .phase-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    border-radius: var(--border-radius-xl);
    color: white;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 1.2rem;
    box-shadow: var(--shadow-sm);
}

/* Gantt view styles */
.gantt-container {
    display: none;
    padding: 1.5rem;
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius-md);
}

.gantt-container.active {
    display: block;
}

.gantt-phase {
    margin-bottom: 2rem;
    background-color: rgba(var(--light-gray-rgb, 233, 236, 239), 0.3);
    border-radius: var(--border-radius-md);
    padding: 1rem;
    transition: all var(--transition-normal);
}

.gantt-phase:hover {
    box-shadow: var(--shadow-md);
}

.gantt-phase-header {
    padding: 1rem;
    border-bottom: 1px solid var(--light-gray);
    margin-bottom: 1rem;
}

.gantt-phase-header h3 {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    color: var(--text-color);
}

.gantt-phase-header span {
    font-size: 0.85rem;
    color: var(--dark-gray);
}

.gantt-task {
    position: relative;
    height: 36px;
    margin: 8px 0;
    border-radius: var(--border-radius-md);
    color: white;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    padding-left: 15px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.gantt-task:hover {
    transform: translateY(-2px) scale(1.01);
    box-shadow: var(--shadow-lg);
}

.gantt-task.milestone-task {
    box-shadow: var(--shadow-lg);
}

/* Fancy gradient overlay for visual appeal */
.gradient-overlay {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 30%;
    background: linear-gradient(90deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.2) 100%);
    pointer-events: none;
    border-top-right-radius: var(--border-radius-md);
    border-bottom-right-radius: var(--border-radius-md);
}

/* 3D View specific styles */
.canvas-container {
    position: relative;
    width: 100%;
    height: 500px;
    overflow: hidden;
    border-radius: var(--border-radius-lg);
    display: none;
    box-shadow: var(--shadow-lg);
}

.canvas-container.active {
    display: block;
}

.canvas-container canvas {
    transition: opacity var(--transition-normal);
}

/* Loading indicator */
.loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem;
    background-color: var(--card-bg-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 4px solid var(--light-gray);
    border-top-color: var(--primary-color);
    animation: spin 1s infinite cubic-bezier(0.45, 0.05, 0.55, 0.95);
}

.loading p {
    font-size: 1rem;
    color: var(--text-color);
    font-weight: 500;
}

/* Tooltip */
.tooltip {
    position: absolute;
    background-color: var(--card-bg-color);
    color: var(--text-color);
    padding: 0.8rem 1rem;
    border-radius: var(--border-radius-md);
    font-size: 0.9rem;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
    max-width: 250px;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid var(--light-gray);
}

.tooltip.visible {
    opacity: 1;
}

/* Animation classes */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes slideRight {
    from { transform: translateX(-20px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.1); opacity: 1; }
    100% { transform: scale(1); opacity: 0.8; }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

.slide-up {
    animation: slideUp 0.5s ease forwards;
}

.slide-right {
    animation: slideRight 0.5s ease forwards;
}

.pulse {
    animation: pulse 2s infinite cubic-bezier(0.45, 0.05, 0.55, 0.95);
}

/* Responsive styles */
@media (max-width: 1200px) {
    .phase-indicators {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 0.8rem;
        -webkit-overflow-scrolling: touch;
    }
    
    .phase-indicator {
        min-width: 140px;
        flex-shrink: 0;
    }
}

@media (max-width: 992px) {
    .container {
        padding: 1.5rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .timeline-container {
        padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    header h1 {
        margin-bottom: 0.5rem;
        font-size: 1.8rem;
    }
    
    .timeline-controls {
        margin-top: 0.5rem;
        width: 100%;
        overflow-x: auto;
        padding-bottom: 0.5rem;
        justify-content: space-between;
    }
    
    .timeline-container {
        padding: 1rem;
    }
    
    .phase-indicators {
        flex-direction: row;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        margin-bottom: 1rem;
        padding-bottom: 0.8rem;
    }
    
    .phase-indicator {
        min-width: 120px;
        flex-shrink: 0;
    }
    
    .panel {
        width: 95%;
    }
    
    .gantt-task {
        font-size: 0.8rem;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .timeline-controls {
        gap: 0.5rem;
    }
    
    button {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }
    
    .view-toggle button {
        padding: 0.4rem 0.6rem;
    }
    
    .phase-indicator {
        min-width: 110px;
        padding: 0.4rem 0.8rem;
    }
    
    .timeline-legend {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }
}

/* Class for clickable elements with feedback */
.clickable {
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.clickable:active {
    transform: scale(0.97);
}

.clickable::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
    transition: transform 0.4s ease-out, opacity 0.4s ease-out;
}

.clickable:active::after {
    transform: translate(-50%, -50%) scale(2.5);
    opacity: 0.3;
}

/* Glass morphism effect */
.glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Toast notifications */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    background-color: var(--card-bg-color);
    color: var(--text-color);
    padding: 12px 20px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 200px;
    max-width: 400px;
    pointer-events: all;
    border: 1px solid var(--light-gray);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 10px;
}

.toast i {
    font-size: 1.2rem;
}

.toast-success i {
    color: var(--success-color);
}

.toast-error i {
    color: var(--accent-color);
}

.toast-info i {
    color: var(--primary-color);
}

.toast.fade-out {
    animation: fadeOut 0.3s ease forwards;
}

@keyframes fadeOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(100%); }
}

/* Footer styles */
footer {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--light-gray);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    color: var(--dark-gray);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-link {
    color: var(--dark-gray);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.footer-link:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* Section title */
.section-title {
    font-size: 1.2rem;
    color: var(--text-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

/* Enhanced zoom controls */
.zoom-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--card-bg-color);
    padding: 0.3rem;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

/* Enhanced animations */
.timeline-event, .phase-indicator, .gantt-task {
    will-change: transform;
}

.timeline-event:hover, .phase-indicator:hover, .gantt-task:hover {
    transform: scale(1.05);
}

/* Smooth scrolling */
.timeline-viewport {
    scroll-behavior: smooth;
}

/* Enhanced focus styles */
button:focus-visible,
.phase-indicator:focus-visible,
.timeline-event:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Loading animation enhancement */
.loading-spinner {
    position: relative;
}

.loading-spinner::before,
.loading-spinner::after {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    border: 2px solid transparent;
    border-radius: 50%;
    animation: pulse 2s linear infinite;
}

.loading-spinner::after {
    animation-delay: 1s;
}

/* Enhanced scrollbar for dark mode */
.dark-mode .timeline-viewport::-webkit-scrollbar-track {
    background: var(--light-gray);
}

.dark-mode .timeline-viewport::-webkit-scrollbar-thumb {
    background-color: var(--mid-gray);
}

/* Enhanced glass effect for dark mode */
.dark-mode .glass {
    background: rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.1);
}

/* Improved accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High contrast mode support */
@media (forced-colors: active) {
    .timeline-event,
    .phase-indicator,
    .gantt-task {
        border: 2px solid currentColor;
    }
    
    .button.active {
        border: 2px solid currentColor;
    }
}