/* CSS Variables for Light/Dark Theme */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px 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);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --primary-color: #60a5fa;
    --primary-hover: #3b82f6;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Gradient Text */
.gradient-text {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: bold;
}

[data-theme="dark"] .gradient-text {
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

[data-theme="dark"] .header.scrolled {
    background-color: rgba(15, 23, 42, 0.95);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
    position: relative;
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.sun-icon {
    transition: all 0.3s ease;
}

.moon-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(90deg) scale(0);
    transition: all 0.3s ease;
}

[data-theme="dark"] .sun-icon {
    transform: rotate(-90deg) scale(0);
}

[data-theme="dark"] .moon-icon {
    transform: translate(-50%, -50%) rotate(0deg) scale(1);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.nav-toggle:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 5rem 1rem 2rem;
    text-align: center;
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: bold;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1.25rem, 4vw, 1.5rem);
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.hero-social {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.social-link {
    color: var(--text-muted);
    font-size: 1.5rem;
    transition: color 0.3s ease, transform 0.3s ease;
}

.social-link:hover {
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background-color: var(--bg-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

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

/* Sections */
.section {
    padding: 5rem 0;
}

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

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

.section-title {
    font-size: clamp(2rem, 6vw, 3rem);
    font-weight: bold;
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
}

/* Cards */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

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

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.card-content {
    padding: 1.5rem;
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.about-card {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.about-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.about-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.about-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.about-card p {
    color: var(--text-secondary);
}

/* Education Section */
.education-card {
    max-width: 800px;
    margin: 0 auto;
}

.education-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.education-icon {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    padding: 1rem;
    border-radius: 0.75rem;
    font-size: 2rem;
}

.education-details h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.institution {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.education-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
}

.cgpa-badge {
    margin-bottom: 1rem;
}

.badge {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 1.125rem;
    font-weight: 500;
}

.coursework h4 {
    font-weight: 600;
    margin-bottom: 0.75rem;
}

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

.tag {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
}

/* Experience Section */
.experience-card {
    max-width: 800px;
    margin: 0 auto;
}

.experience-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.experience-icon {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    padding: 1rem;
    border-radius: 0.75rem;
    font-size: 2rem;
}

.experience-details h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.company {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.location {
    color: var(--text-muted);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.experience-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
}

.certificate-badge {
    margin-bottom: 1rem;
}

.achievements {
    list-style: none;
    padding: 0;
}

.achievements li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.achievements li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5rem;
    width: 0.5rem;
    height: 0.5rem;
    background-color: var(--primary-color);
    border-radius: 50%;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.skill-category {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.skill-category:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.skill-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.skill-header i {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    padding: 0.5rem;
    border-radius: 0.5rem;
    font-size: 1.5rem;
}

.skill-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

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

.skill-tag {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: 0.375rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.project-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.project-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    flex: 1;
}

.project-date {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tech-tag {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
}

.project-achievements {
    margin-bottom: 1.5rem;
}

.project-achievements h4 {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.project-achievements ul {
    list-style: none;
    padding: 0;
}

.project-achievements li {
    position: relative;
    padding-left: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.project-achievements li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.375rem;
    width: 0.375rem;
    height: 0.375rem;
    background-color: var(--primary-color);
    border-radius: 50%;
}

/* Certifications Section */
.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.cert-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.cert-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.cert-icon {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    padding: 1rem;
    border-radius: 0.75rem;
    font-size: 1.5rem;
    width: fit-content;
    margin-bottom: 1rem;
}

.cert-info {
    flex: 1;
    margin-bottom: 1rem;
}

.cert-info h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

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

.cert-date {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.contact-info p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.contact-icon {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    padding: 0.75rem;
    border-radius: 0.5rem;
    font-size: 1.25rem;
}

.contact-label {
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.contact-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: var(--text-primary);
}

/* Contact Form */
.contact-form-container {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 2rem;
    box-shadow: var(--shadow);
}

.contact-form h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    text-align: center;
}

.footer-brand {
    font-size: 1.5rem;
    font-weight: bold;
}

.footer-social {
    display: flex;
    gap: 1.5rem;
}

.footer-text {
    color: var(--text-muted);
}

.footer-text p:first-child {
    margin-bottom: 0.5rem;
}

/* Toast Notification */
.toast {
    position: fixed;
    top: 2rem;
    right: 2rem;
    background-color: #10b981;
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1001;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
}

.fade-in.animate {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.8s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--bg-primary);
        border-top: 1px solid var(--border-color);
        flex-direction: column;
        padding: 2rem 0;
        gap: 1rem;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: block;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

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

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

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

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

@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }

    .section {
        padding: 3rem 0;
    }

    .hero {
        padding: 4rem 1rem 2rem;
    }

    .card-header,
    .card-content {
        padding: 1rem;
    }

    .contact-form-container {
        padding: 1.5rem;
    }

    .toast {
        right: 1rem;
        left: 1rem;
        top: 1rem;
    }
}