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

:root {
    --primary: #6366f1;
    --secondary: #a78bfa;
    --accent: #3b82f6;
    --electric-purple: #8b5cf6;
    --dark-bg: #0f0f0f;
    --dark-section: #1a1a1a;
    --dark-card: #262626;
    --light-text: #e5e5e5;
    --muted-text: #a3a3a3;
    --border-color: #2e2e2e;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--light-text);
    overflow-x: hidden;
    margin: 0;
    padding: 0;
    background: var(--dark-bg);
}

/* Typography */
h1, h2, h3 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
}

p {
    font-weight: 400;
    letter-spacing: 0.01em;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 15, 15, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

nav a {
    color: var(--light-text);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    letter-spacing: 0.02em;
}

nav a:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    position: relative;
}

.hero-content {
    z-index: 2;
    padding: 2rem;
}

.hero h1 {
    font-size: 4.5rem;
    margin-bottom: 1rem;
    animation: fadeInUp 1s;
    background: linear-gradient(135deg, #fff 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero .tagline {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    animation: fadeInUp 1s 0.2s both;
    font-weight: 300;
    letter-spacing: 0.05em;
}

.hero .badges {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s 0.4s both;
}

.badge {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.6rem 1.2rem;
    border-radius: 25px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Sections */
section {
    padding: 5rem 2rem;
    width: 100%;
    background: var(--dark-section);
}

/* Specific sections with dark background for alternating pattern */
#stem, #work, #portfolio, #contact {
    background: var(--dark-bg);
}

.section-content {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 3rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* About Section - NEW DESIGN */
#about {
    background: var(--dark-section);
}

.about-container {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 4rem;
    align-items: start;
    margin-top: 3rem;
}

.about-image-wrapper {
    position: sticky;
    top: 100px;
}

.about-image {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    border: 2px solid var(--border-color);
}

.about-text {
    font-size: 1.15rem;
    line-height: 1.9;
    color: var(--light-text);
}

.about-text p {
    margin-bottom: 2rem;
    text-align: left;
}

.about-text p:first-child::first-letter {
    font-size: 3.5rem;
    font-weight: 700;
    float: left;
    line-height: 0.8;
    margin: 0.1rem 0.5rem 0 0;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Research Cards */
.research-card {
    background: linear-gradient(135deg, #4c1d95 0%, #5b21b6 100%);
    color: white;
    padding: 2.5rem;
    border-radius: 20px;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.research-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

.research-card h3 {
    font-size: 1.6rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
}

.tech-badge {
    background: rgba(255, 255, 255, 0.15);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.9rem;
    font-weight: 500;
}

/* Fitness Cards */
.fitness-card {
    background: var(--dark-card);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s;
    border: 1px solid var(--border-color);
}

.fitness-card:hover {
    transform: scale(1.05);
}

.fitness-card-content {
    padding: 1.5rem;
}

.fitness-card-content h3 {
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.fitness-card-content p {
    color: var(--muted-text);
}

/* Work Cards */
.work-card {
    background: var(--dark-card);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
}

.work-card h3 {
    color: var(--primary);
    margin-bottom: 0.5rem;
    font-size: 1.4rem;
}

.work-date {
    color: var(--muted-text);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 3rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 1rem;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), var(--secondary));
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -2.4rem;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--dark-section);
    box-shadow: 0 0 0 3px var(--primary);
}

/* Publication Box */
.publication-box {
    background: linear-gradient(135deg, #ec4899 0%, #8b5cf6 100%);
    color: white;
    padding: 2.5rem;
    border-radius: 20px;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.publication-box a {
    color: white;
    text-decoration: underline;
    font-weight: 500;
}

/* Contact Section */
.contact {
    background: var(--dark-bg) !important;
    color: var(--light-text);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
}

.contact-links a {
    color: var(--light-text);
    font-size: 1.2rem;
    transition: all 0.3s;
    padding: 0.8rem 1.5rem;
    background: var(--dark-card);
    border-radius: 10px;
    text-decoration: none;
    border: 1px solid var(--border-color);
    font-weight: 500;
}

.contact-links a:hover {
    transform: scale(1.1);
    background: var(--primary);
    border-color: var(--primary);
}

/* Image Placeholder */
.img-placeholder {
    background: linear-gradient(135deg, #4c1d95 0%, #5b21b6 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
    text-align: center;
    padding: 1rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

.fitness-img {
    width: 100%;
    height: 350px;
    object-fit: cover;
}

.fitness-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.progress-bar {
    background: var(--border-color);
    height: 10px;
    border-radius: 5px;
    overflow: hidden;
    margin-top: 1rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    width: 75%;
    animation: progressAnimation 2s;
}

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

@keyframes progressAnimation {
    from {
        width: 0;
    }
}

/* Responsive */
@media (max-width: 968px) {
    .about-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-image-wrapper {
        position: static;
    }
    
    .about-image {
        height: 400px;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .timeline {
        padding-left: 2rem;
    }
    
    #portfolio > .section-content > div:first-child {
        grid-template-columns: 1fr;
    }
}
.beta-label {
  font-size: 0.75rem;
  font-weight: bold;
  color: #ff4d4d;
  margin-left: 8px;
  background: rgba(255,77,77,0.1);
  padding: 2px 6px;
  border-radius: 6px;
}

/* Label used for released projects */
.release-label {
    font-size: 0.75rem;
    font-weight: bold;
    color: #10b981; /* green text */
    margin-left: 8px;
    background: rgba(16, 185, 129, 0.1);
    padding: 2px 6px;
    border-radius: 6px;
}

/* Mobile navigation toggle styles */
nav .nav-toggle {
    display: none;
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    z-index: 1001;
}
nav .nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    margin: 5px 0;
    background: var(--light-text);
    transition: 0.3s ease-in-out;
}

/* Transform hamburger into an “X” when nav is open */
nav.open .nav-toggle span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
nav.open .nav-toggle span:nth-child(2) {
    opacity: 0;
}
nav.open .nav-toggle span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Small‑screen menu styles */
@media (max-width: 768px) {
    nav ul {
        display: none;
        flex-direction: column;
        width: 100%;
        background: rgba(15, 15, 15, 0.95);
        position: absolute;
        top: 100%;
        left: 0;
        text-align: center;
        gap: 1rem;
        padding: 1rem 0;
        border-bottom: 1px solid var(--border-color);
    }
    nav.open ul {
        display: flex;
    }
    nav .nav-toggle {
        display: block;
    }
}