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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #fff;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, #130431 0%, #eb9617 50%, #130431 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 700;
}

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

.timeline {
    padding: 40px;
}

.phase {
    margin-bottom: 50px;
    border-left: 4px solid #2FC6F9;
    padding-left: 30px;
    position: relative;
}

.phase::before {
    content: '';
    position: absolute;
    left: -8px;
    top: 0;
    width: 12px;
    height: 12px;
    background: #2FC6F9;
    border-radius: 50%;
    border: 3px solid white;
    box-shadow: 0 0 10px rgba(52, 152, 219, 0.5);
}

.phase-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.phase-title {
    font-size: 2em;
    color: #2c3e50;
    font-weight: 700;
}

.phase-date {
    background: #bfd402;
    color: white;
    padding: 8px 16px;
    border-radius: 25px;
    font-weight: 600;
    font-size: 0.9em;
}

.milestone {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    border-left: 4px solid #27ae60;
    transition: all 0.3s ease;
    cursor: pointer;
}

.milestone:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.milestone.completed {
    background: #d5f4e6;
    border-left-color: #27ae60;
}

.milestone.in-progress {
    background: #fff3cd;
    border-left-color: #ffc107;
}

.milestone-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.milestone-title {
    font-size: 1.3em;
    font-weight: 600;
    color: #2c3e50;
}

.milestone-duration {
    background: #6c757d;
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.8em;
}

.milestone-tasks {
    list-style: none;
    margin-top: 15px;
}

.milestone-tasks li {
    padding: 5px 0;
    color: #555;
    display: flex;
    align-items: center;
}

.milestone-tasks li::before {
    content: '✓';
    background: #27ae60;
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 10px;
    font-size: 0.8em;
}

.risk-indicator {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8em;
    font-weight: 600;
    margin-left: 10px;
}

.risk-low { background: #d4edda; color: #155724; }
.risk-medium { background: #fff3cd; color: #856404; }
.risk-high { background: #f8d7da; color: #721c24; }

.dependencies {
    background: #e3f2fd;
    border-radius: 8px;
    padding: 15px;
    margin-top: 15px;
}

.dependencies h4 {
    color: #1976d2;
    margin-bottom: 8px;
}

.dependencies ul {
    list-style-type: disc;
    margin-left: 20px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #ecf0f1;
    border-radius: 4px;
    margin: 20px 0;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #27ae60, #2ecc71);
    border-radius: 4px;
    transition: width 0.5s ease;
}

.checkbox-container {
    display: flex;
    align-items: center;
    margin-top: 10px;
}

.checkbox-container input[type="checkbox"] {
    margin-right: 8px;
    transform: scale(1.2);
}

.tech-stack {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    margin: 30px 0;
}

.tech-stack h3 {
    color: #2c3e50;
    margin-bottom: 15px;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.nav-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 20px 0;
}

.nav-btn {
    background: #2FC6F9;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.1em;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
}

.nav-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.nav-btn.active {
    background: #380d8d;
    box-shadow: none;

}

.project-plan {
    padding: 40px;
    line-height: 1.8;
}

.project-plan h1 {
    color: #888;
    margin-top: 20px;
    margin-bottom: 20px;
    font-size: 2.5em;
    padding-bottom: 10px;
}

.project-plan h2 {
    color: #2c3e50;
    margin-top: 40px;
    margin-bottom: 20px;
    font-size: 2em;
    border-bottom: 3px solid #2FC6F9;
    padding-bottom: 10px;
}

.project-plan h3 {
    color: #34495e;
    margin-top: 30px;
    margin-bottom: 15px;
    font-size: 1.5em;
}

.project-plan h4 {
    color: #34495e;
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 1.2em;
}

.project-plan p {
    margin-bottom: 15px;
    color: #555;
}

.project-plan ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.project-plan li {
    margin-bottom: 8px;
    color: #555;
}

.deliverable-box {
    background: #f8f9fa;
    border-left: 4px solid #2FC6F9;
    padding: 20px;
    margin: 20px 0;
    border-radius: 5px;
}

.deliverable-box h4 {
    color: #2c3e50;
    margin-top: 0;
}

.timeline-box {
    background: #e8f5e8;
    border: 1px solid #27ae60;
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
}

.risk-box {
    background: #fff3cd;
    border: 1px solid #ffc107;
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
}

.risk-box.high {
    background: #f8d7da;
    border-color: #dc3545;
}