/* Custom Styles for Kelvin Kanene Portfolio */

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

body {
    font-family: 'Inter', sans-serif;
    scroll-behavior: smooth;
}

/* Navigation Styles */
.nav-link {
    position: relative;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #4f46e5;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* Hero Section Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content {
    animation: fadeInUp 1s ease-out;
}

.hero-circle {
    animation: fadeInUp 1s ease-out 0.3s both;
}

/* Timeline Styles */
.timeline-item {
    position: relative;
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.6s ease;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.timeline-line {
    background: linear-gradient(180deg, #e0e7ff 0%, #c7d2fe 100%);
}

/* Skill Cards */
.skill-card {
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

.skill-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Tech Stack Tags */
.tech-tag {
    transition: all 0.2s ease;
}

.tech-tag:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Mobile Menu */
#mobile-menu {
    transition: all 0.3s ease;
}

#mobile-menu.show {
    display: block;
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Section Animations */
.section-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.section-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Button Hover Effects */
.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(79, 70, 229, 0.3);
}

/* Contact Form Styles */
.form-input {
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.form-input:focus {
    border-color: #4f46e5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .timeline-item {
        margin-left: 0;
    }
    
    .timeline-line {
        left: 20px;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #4f46e5;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #4338ca;
}

/* Focus States */
a:focus,
button:focus {
    outline: 2px solid #4f46e5;
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    nav,
    footer {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    .section-animate {
        opacity: 1;
        transform: none;
    }
}