body {
    background-color: #4dabf7;
}

.main-content-container {
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.1);
    margin: 20px auto;
    padding: 30px;
    max-width: 1200px;
}

.timeline {
    position: relative;
    margin: 0 auto;
    padding: 40px 0;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 6px;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -3px;
    border-radius: 10px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    width: 50%;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 25px;
    background-color: white;
    border: 4px solid var(--primary-color);
    border-radius: 50%;
    top: 15px;
    z-index: 1;
}

.left {
    left: 0;
    text-align: right;
}

.right {
    left: 50%;
    text-align: left;
}

.left::after {
    right: -12px;
}

.right::after {
    left: -12px;
}

.timeline-content {
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    position: relative;
    word-wrap: keep-all;
    overflow-wrap: break-word;
    text-align: left;
}

.timeline-date {
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.timeline-title {
    font-weight: 600;
    margin-bottom: 10px;
}

.timeline-content p {
    text-align: left;
    position: relative;
    line-height: 1.5;
    margin: 0.5rem 0;
    padding-left: 0;
}

.timeline-content p[data-number] {
    padding-left: 2rem;
    position: relative;
}

.timeline-content p[data-number]::before {
    content: attr(data-number);
    position: absolute;
    left: 0;
    width: 1.5rem;
    text-align: right;
    font-weight: bold;
    color: var(--primary-color);
}

.timeline-content p[data-number]:hover {
    background-color: rgba(52, 152, 219, 0.1);
    border-left: 3px solid var(--primary-color);
    padding-left: calc(2rem - 3px);
    margin-left: 0;
}

.timeline-content p.not-complete {
    opacity: 0.7;
    text-decoration: line-through;
    color: #999;
}

.timeline-content p.not-complete::after {
    content: "⏳";
    margin-left: 0.5rem;
    font-size: 0.8em;
}

.hashtag-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 30px;
}

.hashtag-btn {
    border: 2px solid var(--primary-color);
    background: white;
    color: var(--primary-color);
    border-radius: 20px;
    padding: 5px 15px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

.hashtag-btn:hover, .hashtag-btn.active {
    background: var(--primary-color);
    color: white;
}

.hashtag-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    padding-right: 10px;
}

.hashtag-count {
    margin-left: 8px;
    background-color: rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    padding: 1px 6px;
    font-size: 0.8em;
    font-weight: 600;
}

.hashtag-btn.active .hashtag-count {
    background-color: rgba(255, 255, 255, 0.3);
}

.hashtag-btn:hover .hashtag-count {
    background-color: rgba(0, 0, 0, 0.15);
}

.hashtag-btn.active:hover .hashtag-count {
    background-color: rgba(255, 255, 255, 0.4);
}

.timeline-item.faded {
    opacity: 0.3;
}

.timeline-item.highlighted .timeline-content {
    border: 2px solid var(--primary-color);
    transform: scale(1.02);
}

.parallel-item {
    margin-top: 20px;
}

.badge {
    margin-right: 5px;
    margin-bottom: 5px;
}

@media (max-width: 768px) {
    .timeline::after {
        left: 31px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }
    
    .timeline-item::after {
        left: 18px;
    }
    
    .left, .right {
        left: 0;
        text-align: left;
    }
    
    .left::after, .right::after {
        left: 18px;
    }
    
    .main-content-container {
        padding: 15px;
        margin: 10px;
    }
}

.hashtag-btn[data-filter="education"] {
    border-color: #3498db;
    color: #3498db;
}

.hashtag-btn[data-filter="education"]:hover,
.hashtag-btn[data-filter="education"].active {
    background-color: #3498db;
    color: white;
}

.hashtag-btn[data-filter="certification"] {
    border-color: #2ecc71;
    color: #2ecc71;
}

.hashtag-btn[data-filter="certification"]:hover,
.hashtag-btn[data-filter="certification"].active {
    background-color: #2ecc71;
    color: white;
}

.hashtag-btn[data-filter="ctf"] {
    border-color: #e74c3c;
    color: #e74c3c;
}

.hashtag-btn[data-filter="ctf"]:hover,
.hashtag-btn[data-filter="ctf"].active {
    background-color: #e74c3c;
    color: white;
}

.hashtag-btn[data-filter="competitions"] {
    border-color: #04cff7;
    color: #04cff7;
}

.hashtag-btn[data-filter="competitions"]:hover,
.hashtag-btn[data-filter="competitions"].active {
    background-color: #04cff7;
    color: white;
}

.hashtag-btn[data-filter="work"] {
    border-color: #f39c12;
    color: #f39c12;
}

.hashtag-btn[data-filter="work"]:hover,
.hashtag-btn[data-filter="work"].active {
    background-color: #f39c12;
    color: white;
}

.hashtag-btn[data-filter="publications"] {
    border-color: #a3ff04;
    color: #a3ff04;
}

.hashtag-btn[data-filter="publications"]:hover,
.hashtag-btn[data-filter="publications"].active {
    background-color: #a3ff04;
    color: white;
}

.badge.bg-primary { background-color: #3498db; }
.badge.bg-success { background-color: #2ecc71; }
.badge.bg-warning { background-color: #f39c12; }
.badge.bg-danger { background-color: #e74c3c; }
.badge.bg-info { background-color: #9b59b6; }
.badge.bg-publications { background-color: #a3ff04; }

.btn-certificate {
    background-color: #f8f9fa;
    border: 1px solid #6c757d;
    color: #343a40;
    transition: all 0.3s ease;
}

.btn-certificate:hover {
    background-color: #e9ecef;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.btn-certificate i {
    color: #d4af37;
}

@media (max-width: 768px) {
    #certificateModal .modal-dialog {
        margin: 0;
        max-width: 100%;
        height: 100%;
    }
    
    #certificateIframe {
        height: 70vh;
    }
}

.timeline-item.right .timeline-content {
    margin-left: auto;
    max-width: 95%;
}

.timeline-item.left .timeline-content {
    margin-right: auto;
    max-width: 95%;
}

.achievement-badge {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 20px;
    padding: 8px 15px;
    margin: 10px 0;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    border: 1px solid rgba(255,215,0,0.3);
}

.achievement-badge i {
    color: #FFD700;
    margin-right: 8px;
    font-size: 1.2em;
}

.achievement-badge span {
    font-weight: bold;
    color: #2c3e50;
    margin-right: 5px;
}

.achievement-badge .achievement-description {
    color: #7f8c8d;
    font-size: 0.9em;
}

.achievement-badge.medal {
    background: linear-gradient(135deg, #fff9e6 0%, #ffeb99 100%);
}

.achievement-badge.medal i {
    color: #c0a145;
}

.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background-color: #333;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: #555;
}

.filter-sidebar {
    position: fixed;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    transition: all 0.3s ease;
}

.filter-toggle {
    background-color: var(--primary-color);
    color: white;
    padding: 10px 15px;
    border-radius: 0 5px 5px 0;
    cursor: pointer;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 2px 2px 10px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
}

.filter-toggle:hover {
    background-color: var(--secondary-color);
    padding-right: 20px;
}

.filter-content {
    background-color: white;
    padding: 15px;
    border-radius: 0 5px 5px 0;
    box-shadow: 2px 2px 15px rgba(0,0,0,0.1);
    max-height: 70vh;
    overflow-y: auto;
    display: none;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
}

.filter-sidebar.expanded .filter-content {
    display: flex;
}

.filter-sidebar.expanded .filter-toggle i {
    transform: rotate(90deg);
}

.filter-sidebar .filter-toggle i {
    transition: transform 0.3s ease;
}

@media (max-width: 768px) {
    .filter-sidebar {
        top: auto;
        bottom: 70px;
        transform: none;
    }
    
    .filter-toggle {
        padding: 8px 12px;
        font-size: 0.9em;
    }
    
    .filter-content {
        max-height: 50vh;
    }
}