/* ================================
   Portfolio Website - Mudassar Ahmed
   Modern Dark Theme Design
   ================================ */

:root {
    /* Enhanced Color Palette */
    --primary: #1e90ff;
    --primary-light: #4da6ff;
    --primary-dark: #0066cc;
    --bg-dark: #0a0a0f;
    --bg-card: #141419;
    --bg-alt: #0f0f15;
    --text-primary: #f5f5f7;
    --text-secondary: #b8b8c4;
    --text-muted: #787885;
    --border: #2a2a35;
    --gradient: linear-gradient(135deg, #1e90ff, #4da6ff);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(30, 144, 255, 0.3);
    --radius: 16px;
    --radius-sm: 8px;
    --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.8;
    font-size: 17px;
    position: relative;
    overflow-x: hidden;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Space Background with Real Nebula Imagery */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('assets/img/nebula-bg.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    opacity: 0.25;
    z-index: -2;
}

/* Cosmic Galaxy Overlay */
body::after {
    content: '';
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background-image: url('assets/img/galaxy-overlay.png');
    background-size: cover;
    background-position: top right;
    background-repeat: no-repeat;
    background-attachment: fixed;
    opacity: 0.15;
    z-index: -1;
    pointer-events: none;
    animation: galaxyFloat 60s ease-in-out infinite;
}

@keyframes galaxyFloat {

    0%,
    100% {
        opacity: 0.15;
        transform: scale(1);
    }

    50% {
        opacity: 0.2;
        transform: scale(1.05);
    }
}

/* ================================
   Navigation
   ================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    border-bottom-color: var(--border);
    background: rgba(10, 10, 15, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-light);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-menu a:hover {
    color: var(--text-primary);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: var(--transition);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ================================
   Hero Section
   ================================ */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 2rem 4rem;
    background: transparent;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle at 70% 30%,
            rgba(99, 102, 241, 0.15) 0%,
            rgba(0, 102, 204, 0.1) 25%,
            transparent 50%);
    filter: blur(60px);
    pointer-events: none;
    animation: galaxyPulse 8s ease-in-out infinite;
}

@keyframes galaxyPulse {

    0%,
    100% {
        opacity: 0.5;
        transform: scale(1);
    }

    50% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero-text h1 {
    font-size: clamp(3rem, 7vw, 5rem);
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.04em;
    line-height: 1.1;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 20px rgba(30, 144, 255, 0.2);
}

.tagline {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-weight: 500;
    line-height: 1.6;
    letter-spacing: 0.01em;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin-bottom: 2.5rem;
    line-height: 1.9;
    font-weight: 400;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1.1rem 2.2rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    letter-spacing: 0.02em;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: var(--shadow-glow), var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(30, 144, 255, 0.5), var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--primary);
    background: rgba(30, 144, 255, 0.1);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.hero-info {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.info-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.info-card a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.info-card a:hover {
    color: var(--primary-light);
}

.info-icon {
    font-size: 1.2rem;
}

/* Social Links */
.social-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.social-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.social-links a:hover {
    color: var(--primary-light);
}

/* ================================
   Section Styles
   ================================ */

.section {
    padding: 8rem 2rem;
}

.section-alt {
    background: var(--bg-alt);
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 4rem;
    position: relative;
    display: inline-block;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 0;
    width: 80px;
    height: 4px;
    background: var(--gradient);
    border-radius: 4px;
    box-shadow: var(--shadow-glow);
}

.subsection-title {
    font-size: 1.2rem;
    color: var(--primary-light);
    margin: 2.5rem 0 1.5rem;
    font-weight: 600;
}

/* ================================
   Publications
   ================================ */

.publication-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2.5rem;
    transition: var(--transition);
}

.publication-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.publication-card.featured {
    border-left: 3px solid var(--primary);
}

.pub-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary-light);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.publication-card h3 {
    font-size: 1.35rem;
    margin-bottom: 1rem;
    line-height: 1.5;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.pub-authors {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.pub-journal {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.pub-doi {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
}

.pub-doi:hover {
    color: var(--text-primary);
}

.manuscript-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.manuscript-list li {
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.manuscript-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-light);
}

/* ================================
   Projects
   ================================ */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    transition: var(--transition);
}

.project-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), 0 0 25px rgba(30, 144, 255, 0.2);
}

.project-year {
    font-size: 0.8rem;
    color: var(--primary-light);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.project-card h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.project-card p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

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

.project-tags span {
    background: rgba(0, 102, 204, 0.15);
    color: var(--primary-light);
    padding: 0.3rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* ================================
   Skills
   ================================ */

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    transition: var(--transition);
}

.skill-category:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.skill-category h3 {
    font-size: 1.1rem;
    margin-bottom: 1.25rem;
    color: var(--primary-light);
    font-weight: 700;
}

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

.skill-tags span {
    background: var(--bg-alt);
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.85rem;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.skill-tags span:hover {
    border-color: var(--primary);
    color: var(--text-primary);
}

/* ================================
   Education
   ================================ */

.education-timeline {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.education-item {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 2rem;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.education-item:hover {
    border-color: var(--primary);
}

.edu-period {
    color: var(--primary-light);
    font-size: 0.9rem;
    font-weight: 600;
}

.edu-content h3 {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
}

.edu-institution {
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.edu-details {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.edu-thesis {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

/* ================================
   Awards
   ================================ */

.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.award-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.award-item:hover {
    border-color: var(--primary);
}

.award-icon {
    font-size: 1.5rem;
}

.award-item h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.award-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ================================
   Contact
   ================================ */

.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-intro {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.contact-cards {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.contact-card:hover {
    border-color: var(--primary);
    color: var(--text-primary);
}

.contact-icon {
    font-size: 1.2rem;
}

/* ================================
   Footer
   ================================ */

.footer {
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--bg-card);
        flex-direction: column;
        padding: 5rem 2rem;
        gap: 1.5rem;
        transition: var(--transition);
        border-left: 1px solid var(--border);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero {
        padding-top: 6rem;
    }

    .education-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .section {
        padding: 4rem 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}