:root {
    --bg-color: #F5F5F7;
    --card-bg: #FFFFFF;
    --apple-blue: #0071E3;
    --apple-blue-hover: #0062c4;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --line-color: #E5E5EA;
    --transition-spring: cubic-bezier(0.25, 0.8, 0.25, 1);
    --scroll-distance-multiplier: 2.5;
}

#vertical-scroll-wrapper {
    height: calc(100vh * var(--scroll-distance-multiplier)); 
    background-color: var(--bg-color);
    position: relative;
    padding: 3em;
}

.timeline-container-project {
    position: sticky;
    top: 0;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.timeline-track {
    display: flex;
    padding: 0 10vw;
    gap: 0;
    scrollbar-width: none; 
    -ms-overflow-style: none;
    align-items: stretch;
    position: absolute; 
    left: 0; 
    transition: transform 0.1s linear;
}

.timeline-track::-webkit-scrollbar { display: none; }

.timeline-item {
    flex: 0 0 350px; 
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: inherit;
}

.item-year {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
    transition: color 0.3s ease;
}

.connector-wrapper {
    position: relative;
    width: 100%;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.connector-line {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--line-color);
    transform: translateY(-50%);
    z-index: 1;
}

.timeline-item:first-child .connector-line { left: 50%; width: 50%; }
.timeline-item:last-child .connector-line { width: 50%; right: 50%; }

.connector-dot {
    width: 12px;
    height: 12px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    z-index: 2;
    transition: all 0.4s var(--transition-spring);
    border: 4px solid var(--bg-color);
    box-shadow: 0 0 0 1px rgba(0,0,0,0.05);
}

.item-card {
    margin-top: 24px;
    width: 280px;
    background-color: var(--card-bg);
    border-radius: 24px;
    padding: 24px;
    padding-bottom: 70px; 
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    transition: all 0.4s var(--transition-spring);
    position: relative;
    z-index: 5;
    border: 1px solid rgba(0,0,0,0.03);
    flex-grow: 1;
    overflow: hidden; /* İçindeki şekillerin dışarı taşmasını engeller */
}

.card-shape {
    position: absolute;
    opacity: 0.2; /* Hafif bir görünüm */
    z-index: 0; /* İçeriğin arkasında kalmasını sağlar */
}

.card-shape.circle {
    width: 80px;
    height: 80px;
    background-color: var(--apple-blue);
    border-radius: 50%;
    top: -20px;
    left: -20px;
    filter: blur(20px);
}

.card-shape.square {
    width: 100px;
    height: 100px;
    background-color: #FFC0CB;
    top: 70%;
    right: -30px;
    transform: rotate(25deg);
    filter: blur(15px);
}

.card-shape.triangle {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 80px solid #90EE90;
    bottom: -30px;
    left: 10px;
    transform: rotate(-15deg);
    filter: blur(18px);
}

.card-content-text {
    position: relative;
    z-index: 1;
}

.card-title-timeline {
    font-size: 1.1rem; 
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    min-height: 5rem;
}

.card-arrow-btn {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 40px; 
    height: 40px;
    background-color: var(--apple-blue);
    border-radius: 50%;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 113, 227, 0.3); 
    transition: all 0.3s var(--transition-spring);
    opacity: 0.9;
    z-index: 10; /* En üstte görünmesi için */
}

.card-arrow-btn svg {
    width: 20px; 
    height: 20px;
    stroke-width: 2.5;
    transition: transform 0.3s ease;
}

.timeline-item:hover .item-year { color: var(--apple-blue); }
.timeline-item:hover .connector-dot {
    background-color: var(--apple-blue);
    transform: scale(1.3);
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.15);
}

.timeline-item:hover .item-card {
    transform: translateY(-12px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.timeline-item:hover .card-arrow-btn {
    opacity: 1;
    transform: scale(1.05); 
}

.card-arrow-btn:hover {
    background-color: var(--apple-blue-hover);
    transform: scale(1.1) !important;
}

.card-arrow-btn:hover svg {
        transform: translateX(2px);
}

.dummy-content {
    padding: 100px 50px;
    text-align: center;
    font-size: 1.5rem;
    background-color: #e3e3e8;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}