/* CSS Variables - Dark Blue Theme */
:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #60a5fa;
    --accent: #0ea5e9;
    --background: #020617;
    --surface: #0f172a;
    --surface-light: #1e293b;
    --surface-lighter: #334155;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --gradient: linear-gradient(135deg, #1e40af 0%, #3b82f6 50%, #06b6d4 100%);
    --gradient-secondary: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 100%);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 40px -10px var(--primary);
    --shadow-glow-strong: 0 0 60px -15px rgba(59, 130, 246, 0.5);
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    padding: 0.75rem 0;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: width 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(30, 64, 175, 0.2) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 60% 80%, rgba(6, 182, 212, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 40% 80%, rgba(14, 165, 233, 0.1) 0%, transparent 40%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.hero-greeting {
    font-size: 1.1rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 0.5rem;
    animation: fadeInUp 0.6s ease;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1rem;
    min-height: 1.2em;
    animation: fadeInUp 0.6s ease 0.1s both;
}

.typing-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
}

.cursor {
    color: var(--accent);
    animation: blink 1s infinite;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 500px;
    margin-bottom: 2rem;
    animation: fadeInUp 0.6s ease 0.3s both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    animation: fadeInUp 0.6s ease 0.4s both;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: var(--shadow-glow);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-strong), var(--shadow-lg);
    border-color: rgba(59, 130, 246, 0.5);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--surface-light);
}

.btn-secondary:hover {
    background: var(--surface-light);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

/* Hero Socials */
.hero-socials {
    display: flex;
    gap: 1rem;
    animation: fadeInUp 0.6s ease 0.5s both;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 0.5rem;
    background: var(--surface);
    color: var(--text-muted);
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--surface-light);
    color: var(--text);
    transform: translateY(-3px);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    opacity: 0;
    animation: fadeIn 1s ease 1s both;
}

.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid var(--text-muted);
    border-radius: 13px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
}

.scroll-indicator p {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Section Styles */
section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.75rem;
}

.section-title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 700;
}

/* About Section */
.about {
    background: var(--surface);
}

.about-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 4rem;
    align-items: start;
}

.about-image {
    position: sticky;
    top: 120px;
}

.image-wrapper {
    position: relative;
}

.image-wrapper::before {
    content: '';
    position: absolute;
    inset: -10px;
    background: var(--gradient);
    border-radius: 1rem;
    opacity: 0.3;
    filter: blur(20px);
}

.placeholder-image {
    position: relative;
    aspect-ratio: 1;
    background: var(--surface-light);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.profile-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 1rem;
}

.about-text p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 2rem;
}

.skill-tag {
    padding: 0.5rem 1rem;
    background: var(--background);
    border: 1px solid var(--surface-light);
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.3s ease;
}

.skill-tag:hover {
    border-color: var(--primary);
    color: var(--text);
    transform: translateY(-2px);
}

/* Experience Section */
.experience {
    background: var(--surface);
}

.experience-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.experience-card {
    background: var(--background);
    border-radius: 1rem;
    padding: 1.75rem;
    border: 1px solid var(--surface-light);
    transition: all 0.3s ease;
}

.experience-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
    transform: translateX(5px);
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.experience-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text);
}

.experience-company {
    font-size: 1rem;
    color: var(--primary);
    font-weight: 500;
}

.experience-date {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.experience-location {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.experience-description {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.experience-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.experience-skills span {
    padding: 0.25rem 0.75rem;
    background: var(--surface-light);
    border-radius: 1rem;
    font-size: 0.75rem;
    color: var(--secondary);
}

/* Awards Section */
.awards {
    background: var(--background);
}

.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.award-card {
    background: var(--surface);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--surface-light);
    transition: all 0.3s ease;
}

.award-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.award-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-secondary);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: white;
}

.award-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.award-issuer {
    font-size: 0.875rem;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.award-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--surface);
    border-radius: 1rem;
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid var(--surface-light);
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.project-image {
    aspect-ratio: 16/10;
    overflow: hidden;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 50%, var(--surface) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary);
}

.project-info {
    padding: 1.5rem;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.project-description {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.project-tags span {
    padding: 0.25rem 0.75rem;
    background: var(--background);
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent);
}

.project-links {
    display: flex;
    gap: 1rem;
}

.project-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
    transition: color 0.3s ease;
}

.project-link:hover {
    color: var(--primary);
}

/* Contact Section */
.contact {
    background: var(--surface);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    max-width: 900px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-secondary);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.contact-item p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.25rem;
    background: var(--background);
    border: 1px solid var(--surface-light);
    border-radius: 0.5rem;
    color: var(--text);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

/* Courses Section */
.courses-section {
    padding-top: 8rem;
    padding-bottom: 4rem;
    background: var(--background);
    min-height: 100vh;
}

.course-category {
    margin-bottom: 4rem;
}

.category-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text);
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--surface-light);
}

.category-title svg {
    color: var(--primary);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.course-card {
    background: var(--surface);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--surface-light);
    transition: all 0.3s ease;
}

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

.course-card.highlight {
    border-color: var(--accent);
    background: linear-gradient(135deg, var(--surface) 0%, rgba(14, 165, 233, 0.1) 100%);
}

.course-card.highlight:hover {
    border-color: var(--accent);
    box-shadow: 0 0 40px -10px var(--accent);
}

.course-card.cert {
    background: linear-gradient(135deg, var(--surface) 0%, rgba(59, 130, 246, 0.05) 100%);
}

.course-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.course-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
}

.course-code {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--primary);
    background: var(--background);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
}

.course-badge {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--accent);
    background: rgba(14, 165, 233, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
}

.course-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.semester {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.grade {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--secondary);
    background: rgba(96, 165, 250, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
}

/* Footer */
.footer {
    padding: 2rem 0;
    border-top: 1px solid var(--surface);
}

.footer .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-socials {
    display: flex;
    gap: 1rem;
}

.footer-socials a {
    color: var(--text-muted);
    transition: color 0.3s ease;
}

.footer-socials a:hover {
    color: var(--text);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(12px);
    }
}

/* Scroll Reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 968px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .about-image {
        position: static;
        max-width: 250px;
        margin: 0 auto;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: var(--background);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        transition: right 0.3s ease;
    }

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

    .nav-link {
        font-size: 1.25rem;
    }

    .hamburger {
        display: flex;
        z-index: 1001;
    }

    .hamburger.active span:first-child {
        transform: rotate(45deg) translate(5px, 5px);
    }

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

    .hamburger.active span:last-child {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    section {
        padding: 4rem 0;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .footer .container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .hero-socials {
        justify-content: center;
    }
}