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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: #020617;
    color: #ffffff;
    overflow-x: hidden;
}

html {
    scroll-behavior: smooth;
}

/* Hero Section */
.hero {
    position: relative;
    overflow: hidden;
    padding: 8rem 2rem;
    text-align: center;
}

.hero-gradient-1 {
    position: absolute;
    top: 0;
    left: 25%;
    width: 24rem;
    height: 24rem;
    background: rgba(59, 130, 246, 0.2);
    border-radius: 50%;
    filter: blur(80px);
    animation: float 8s ease-in-out infinite;
}

.hero-gradient-2 {
    position: absolute;
    top: 5rem;
    right: 25%;
    width: 24rem;
    height: 24rem;
    background: rgba(168, 85, 247, 0.2);
    border-radius: 50%;
    filter: blur(80px);
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.hero-content {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid #334155;
    border-radius: 9999px;
    margin-bottom: 2rem;
    font-size: 0.875rem;
    color: #cbd5e1;
    animation: fadeIn 1s ease-out 0.2s both;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.sparkle {
    width: 1rem;
    height: 1rem;
    color: #22d3ee;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

h1 {
    font-size: 4rem;
    font-weight: bold;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #ffffff, #a5f3fc, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeIn 1s ease-out 0.4s both;
}

.hero-gradient-text {
    background: linear-gradient(to right, #22d3ee, #2563eb);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #94a3b8;
    max-width: 48rem;
    margin: 0 auto 3rem;
    line-height: 1.6;
    animation: fadeIn 1s ease-out 0.6s both;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: linear-gradient(to right, #22d3ee, #2563eb);
    color: white;
    font-weight: 600;
    border-radius: 0.75rem;
    text-decoration: none;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    animation: fadeIn 1s ease-out 0.8s both;
}

.cta-button:hover {
    transform: scale(1.05);
    box-shadow: 0 20px 50px rgba(34, 211, 238, 0.5);
}

.chevron {
    width: 1.25rem;
    height: 1.25rem;
    transition: transform 0.3s;
}

.cta-button:hover .chevron {
    transform: translateX(4px);
}

/* Category Section */
.category-section {
    padding: 5rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    opacity: 0;
    animation: fadeIn 0.8s ease-out forwards;
}

.category-header {
    margin-bottom: 3rem;
}

.category-title-wrapper {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.category-icon {
    padding: 0.75rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s;
}

.category-icon:hover {
    transform: rotate(5deg) scale(1.1);
}

.category-icon svg {
    width: 2rem;
    height: 2rem;
    color: white;
}

.category-title {
    font-size: 2.5rem;
    font-weight: bold;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.category-subtitle {
    color: #94a3b8;
    margin-top: 0.25rem;
}

.category-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.category-line {
    height: 0.25rem;
    width: 5rem;
    border-radius: 9999px;
    animation: expandLine 0.6s ease-out;
}

@keyframes expandLine {
    from { width: 0; }
    to { width: 5rem; }
}

.project-count {
    color: #64748b;
    font-size: 0.875rem;
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.project-card {
    display: block;
    background: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid #1e293b;
    border-radius: 0.75rem;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUpCard 0.5s ease-out forwards;
}

@keyframes fadeInUpCard {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-card:nth-child(1) { animation-delay: 0.1s; }
.project-card:nth-child(2) { animation-delay: 0.2s; }
.project-card:nth-child(3) { animation-delay: 0.3s; }
.project-card:nth-child(4) { animation-delay: 0.4s; }
.project-card:nth-child(5) { animation-delay: 0.5s; }
.project-card:nth-child(6) { animation-delay: 0.6s; }

.project-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: #334155;
}

/* Section-specific project card hover effects */
#ml-section .project-card:hover {
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.4);
    border-color: rgba(34, 211, 238, 0.5);
}

#quant-section .project-card:hover {
    box-shadow: 0 20px 40px rgba(168, 85, 247, 0.4);
    border-color: rgba(236, 72, 153, 0.5);
}

#swe-section .project-card:hover {
    box-shadow: 0 20px 40px rgba(16, 185, 129, 0.4);
    border-color: rgba(5, 150, 105, 0.5);
}

#phil-section .project-card:hover {
    box-shadow: 0 20px 40px rgba(245, 158, 11, 0.4);
    border-color: rgba(249, 115, 22, 0.5);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: white;
    transition: all 0.3s;
}

/* Section-specific project title hover effects */
#ml-section .project-card:hover .project-title {
    background: linear-gradient(to right, #60a5fa, #22d3ee);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

#quant-section .project-card:hover .project-title {
    background: linear-gradient(to right, #a855f7, #ec4899);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

#swe-section .project-card:hover .project-title {
    background: linear-gradient(to right, #10b981, #059669);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

#phil-section .project-card:hover .project-title {
    background: linear-gradient(to right, #f59e0b, #f97316);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.external-link {
    width: 1.25rem;
    height: 1.25rem;
    color: #64748b;
    transition: all 0.3s;
    flex-shrink: 0;
}

/* Section-specific external link hover effects */
#ml-section .project-card:hover .external-link {
    color: #22d3ee;
    transform: translate(2px, -2px);
}

#quant-section .project-card:hover .external-link {
    color: #ec4899;
    transform: translate(2px, -2px);
}

#swe-section .project-card:hover .external-link {
    color: #10b981;
    transform: translate(2px, -2px);
}

#phil-section .project-card:hover .external-link {
    color: #f59e0b;
    transform: translate(2px, -2px);
}

.project-description {
    color: #94a3b8;
    font-size: 0.875rem;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    padding: 0.25rem 0.75rem;
    background: rgba(30, 41, 59, 0.5);
    color: #cbd5e1;
    font-size: 0.75rem;
    border-radius: 9999px;
    transition: all 0.3s;
}

.project-card:hover .tag {
    background: rgba(30, 41, 59, 0.8);
}

/* See More Button */
.see-more-wrapper {
    text-align: center;
    margin-top: 2rem;
}

.see-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    color: white;
    font-weight: 600;
    border-radius: 0.75rem;
    border: none;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.3s;
    white-space: nowrap;
}

.see-more-btn:hover {
    transform: scale(1.05);
}

/* Section-specific button hover effects */
#ml-section .see-more-btn:hover {
    box-shadow: 0 10px 30px rgba(34, 211, 238, 0.3);
}

#quant-section .see-more-btn:hover {
    box-shadow: 0 10px 30px rgba(168, 85, 247, 0.3);
}

#swe-section .see-more-btn:hover {
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.3);
}

#phil-section .see-more-btn:hover {
    box-shadow: 0 10px 30px rgba(245, 158, 11, 0.3);
}

.chevron-rotate {
    transition: transform 0.3s;
}

.chevron-rotate.rotated {
    transform: rotate(90deg);
}

/* Divider */
.divider {
    height: 1px;
    background: linear-gradient(to right, transparent, #1e293b, transparent);
    margin: 0 auto;
    max-width: 1200px;
}

/* Footer */
footer {
    border-top: 1px solid #1e293b;
    margin-top: 5rem;
    padding: 3rem 1.5rem;
    text-align: center;
}

.footer-text {
    color: #64748b;
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.footer-links a {
    color: #64748b;
    transition: all 0.3s;
}

.footer-links a:hover {
    color: white;
    transform: translateY(-2px);
}

.footer-icon {
    width: 1.25rem;
    height: 1.25rem;
}

/* Hidden class */
.hidden {
    display: none;
}

/* Gradient classes */
.gradient-blue { background: linear-gradient(to right, #3b82f6, #22d3ee); }
.gradient-purple { background: linear-gradient(to right, #a855f7, #ec4899); }
.gradient-green { background: linear-gradient(to right, #10b981, #059669); }
.gradient-amber { background: linear-gradient(to right, #f59e0b, #f97316); }

/* Fade in for newly added projects */
.fade-in-new {
    animation: fadeInUpCard 0.5s ease-out forwards;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .category-title { font-size: 2rem; }
    .projects-grid { grid-template-columns: 1fr; }
}