body {
    font-family: 'Poppins', sans-serif;
}
.hero-section {
    height: 100vh;
    background: linear-gradient(rgba(17, 24, 39, 0.8), rgba(17, 24, 39, 0.8)), url('https://placehold.co/1920x1080/1f2937/111827?text=Fatih Feten') no-repeat center center/cover;
}
.typing-cursor {
    display: inline-block;
    width: 3px;
    height: 1em;
    background-color: #60a5fa;
    animation: blink 0.7s infinite;
}
@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}
header.scrolled {
    background-color: rgba(17, 24, 39, 0.9);
    backdrop-filter: blur(5px);
}
.section { padding: 100px 0; }
.section-title {
    position: relative;
    padding-bottom: 15px;
    margin-bottom: 50px;
}
.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: #3b82f6;
}
.timeline-item {
    position: relative;
    padding-left: 45px;
    padding-bottom: 40px;
    border-left: 2px solid #374151;
}
.timeline-item:last-child { border-left: 2px solid transparent; }
.timeline-icon {
    position: absolute;
    left: -16px;
    top: 0;
    width: 32px;
    height: 32px;
}
.skill-card { transition: transform 0.3s ease, box-shadow 0.3s ease; }
.skill-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.1);
}
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}