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

:root {
    --primary-color: #1e3a8a;
    --secondary-color: #3b82f6;
    --accent-color: #60a5fa;
    --dark-color: #1f2937;
    --light-color: #f8fafc;
    --white: #ffffff;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;

    --border-radius-sm: 0.375rem;
    --border-radius: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 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-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo span {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-8);
}

.nav-link {
    text-decoration: none;
    color: var(--gray-600);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--gray-600);
    margin: 3px 0;
    transition: 0.3s;
}

/* Dropdown support */
.nav-item {
    position: relative;
    display: inline-block;
}
.dropdown {
    position: relative;
}
.dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}
.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: var(--white);
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius);
    padding: 6px 0;
    min-width: 160px;
    z-index: 1000;
}
.dropdown-item {
    display: block;
    padding: 8px 12px;
    color: var(--gray-600);
    text-decoration: none;
    transition: background-color 0.2s, color 0.2s;
}
.dropdown-item:hover {
    background-color: var(--gray-100);
    color: var(--primary-color);
}
.dropdown:hover .dropdown-menu {
    display: block;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.5) 0%, rgba(59, 130, 246, 0.5) 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('../images/tech-background.jpeg');
    background-size: cover;
    background-position: center;
    opacity: 0.3;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-16);
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-text {
    color: var(--white);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-4);
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: var(--font-size-2xl);
    font-weight: 300;
    margin-bottom: var(--spacing-6);
    color: var(--accent-color);
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-8);
    line-height: 1.7;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-8);
    animation: fadeInUp 1s ease-out 0.6s both;
}

.hero-social {
    animation: fadeInUp 1s ease-out 0.8s both;
}

.hero-image {
    display: flex;
    justify-content: center;
    animation: fadeInRight 1s ease-out 0.5s both;
    position: relative;
    z-index: 3;
}

.profile-container {
    position: relative;
    width: 400px;
    height: 400px;
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    border: 8px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-xl);
    transition: transform 0.3s ease;
}

.profile-img:hover {
    transform: scale(1.05);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-3) var(--spacing-6);
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    font-size: var(--font-size-base);
}

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

.btn-primary:hover {
    background-color: var(--primary-color);
    /* Use your primary color for visibility */
    color: var(--white);
    /* Keep text white for contrast */
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border-color: var(--white);
}

.btn-secondary:hover {
    background-color: var(--white);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-cv {
    background-color: var(--success-color);
    color: var(--white);
    border-color: var(--success-color);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
}

.btn-cv:hover {
    background-color: transparent;
    color: var(--success-color);
    border-color: var(--success-color);
    transform: translateY(-2px);
}

/* Social Links */
.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
    text-decoration: none;
    border-radius: 50%;
    font-size: var(--font-size-xl);
    transition: all 0.3s ease;
}

.social-link:hover {
    background-color: var(--white);
    color: var(--primary-color);
    transform: translateY(-3px);
}

/* Section Styling */
section {
    padding: var(--spacing-20) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-16);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-4);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about {
    background-color: var(--gray-100);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-16);
    align-items: center;
}

.about-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-6);
    line-height: 1.7;
}

.about-info {
    margin-top: var(--spacing-8);
}

.info-item {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-4);
    font-size: var(--font-size-base);
}

.info-item i {
    color: var(--primary-color);
    margin-right: var(--spacing-3);
    width: 20px;
}

.about-stats {
    display: grid;
    gap: var(--spacing-6);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-6);
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-number {
    display: block;
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-2);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    font-weight: 500;
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--gray-300);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-12);
    padding-left: var(--spacing-16);
}

.timeline-marker {
    position: absolute;
    left: 22px;
    top: 0;
    width: 16px;
    height: 16px;
    background-color: var(--primary-color);
    border-radius: 50%;
    border: 4px solid var(--white);
    box-shadow: var(--shadow);
}

.timeline-content {
    background-color: var(--white);
    padding: var(--spacing-6);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.timeline-content:hover {
    transform: translateX(10px);
}

.timeline-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-2);
}

.timeline-content h4 {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: var(--spacing-2);
}

.timeline-date {
    display: inline-block;
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    background-color: var(--gray-100);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-4);
}

/* Skills Section */
.skills {
    background-color: var(--gray-100);
}

.skills-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-16);
}

.skills-category h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-8);
    text-align: center;
}

.skill-item {
    margin-bottom: var(--spacing-6);
}

.skill-name {
    display: block;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--spacing-2);
}

.skill-bar {
    height: 8px;
    background-color: var(--gray-200);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    width: 0;
    border-radius: var(--border-radius);
    transition: width 2s ease-in-out;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-8);
}

.project-card {
    background-color: var(--white);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.project-image {
    height: 200px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-content {
    padding: var(--spacing-6);
}

.project-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-4);
}

.project-content p {
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: var(--spacing-6);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
}

.tag {
    background-color: var(--gray-100);
    color: var(--gray-700);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Certifications Section */
.certifications {
    background-color: var(--gray-100);
}

.certifications-content {
    display: grid;
    gap: var(--spacing-16);
}

.cert-category h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-8);
    text-align: center;
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-12);
}

.cert-item {
    display: flex;
    align-items: center;
    background-color: var(--white);
    padding: var(--spacing-4);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.cert-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.cert-item i {
    color: var(--primary-color);
    margin-right: var(--spacing-3);
    font-size: var(--font-size-lg);
}

.achievements h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-8);
    text-align: center;
}

.achievement-item {
    display: flex;
    align-items: center;
    background-color: var(--white);
    padding: var(--spacing-6);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-4);
    transition: transform 0.3s ease;
}

.achievement-item:hover {
    transform: translateX(10px);
}

.achievement-item i {
    color: var(--warning-color);
    margin-right: var(--spacing-4);
    font-size: var(--font-size-2xl);
}

.achievement-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-1);
}

.achievement-item span {
    color: var(--gray-500);
    font-size: var(--font-size-sm);
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-16);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--spacing-8);
}

.contact-item i {
    color: var(--primary-color);
    margin-right: var(--spacing-4);
    font-size: var(--font-size-xl);
    margin-top: var(--spacing-1);
}

.contact-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-2);
}

.contact-item p,
.contact-item a {
    color: var(--gray-600);
    text-decoration: none;
}

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

/* Contact Form */
.contact-form {
    background-color: var(--white);
    padding: var(--spacing-8);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: var(--spacing-6);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-4);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: border-color 0.3s ease;
}

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

.form-message {
    margin-top: var(--spacing-4);
    padding: var(--spacing-4);
    border-radius: var(--border-radius);
    text-align: center;
    font-weight: 500;
    display: none;
}

.form-message.success {
    background-color: var(--success-color);
    color: var(--white);
}

.form-message.error {
    background-color: var(--error-color);
    color: var(--white);
}

/* Footer */
.footer {
    background-color: var(--gray-900);
    color: var(--white);
    padding: var(--spacing-8) 0;
}

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

.footer-social .social-link {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.footer-social .social-link:hover {
    background-color: var(--primary-color);
}

/* AI Assistant */
#ai-assistant-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 50px;
    padding: 12px 22px;
    font-size: 1rem;
    box-shadow: 0 2px 8px rgba(30, 58, 138, 0.15);
    cursor: pointer;
    transition: background 0.2s;
}

#ai-assistant-btn:hover {
    background: var(--secondary-color);
}

#ai-assistant-window {
    display: none;
    position: fixed;
    bottom: 80px;
    right: 30px;
    width: 340px;
    max-width: 95vw;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(30, 58, 138, 0.18);
    z-index: 10000;
    flex-direction: column;
    overflow: hidden;
    font-family: var(--font-family);
}

#ai-assistant-window.open {
    display: flex;
    flex-direction: column;
}

#ai-assistant-window .ai-header {
    background: var(--primary-color);
    color: #fff;
    padding: 12px 16px;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#ai-assistant-window .ai-header #ai-close {
    cursor: pointer;
    font-size: 1.2em;
}

#ai-assistant-window .ai-messages {
    flex: 1;
    padding: 16px;
    background: var(--gray-100);
    overflow-y: auto;
    max-height: 300px;
}

#ai-assistant-window .ai-msg {
    margin-bottom: 10px;
    padding: 8px 12px;
    border-radius: 8px;
    max-width: 90%;
    word-break: break-word;
}

#ai-assistant-window .ai-msg.user {
    background: var(--primary-color);
    color: #fff;
    align-self: flex-end;
    margin-left: auto;
}

#ai-assistant-window .ai-msg.ai {
    background: #fff;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    align-self: flex-start;
    margin-right: auto;
}

#ai-assistant-window form {
    display: flex;
    border-top: 1px solid var(--gray-200);
    background: #fff;
}

#ai-assistant-window input[type="text"] {
    flex: 1;
    border: none;
    padding: 12px;
    font-size: 1em;
    outline: none;
    background: transparent;
}

#ai-assistant-window button[type="submit"] {
    background: var(--primary-color);
    color: #fff;
    border: none;
    padding: 0 18px;
    cursor: pointer;
    font-size: 1.2em;
    border-radius: 0 0 12px 0;
    transition: background 0.2s;
}

#ai-assistant-window button[type="submit"]:hover {
    background: var(--secondary-color);
}

.ai-typing {
    color: var(--gray-400);
    font-style: italic;
}

/* Scroll Top Button */
.scroll-top-btn {
    position: fixed;
    bottom: 30px;
    left: 30px;
    /* Move to bottom-left corner */
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3em;
}

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

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-12);
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-12);
    }

    .skills-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-12);
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-12);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-8) 0;
    }

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

    .nav-toggle {
        display: flex;
    }

    /* Mobile: dropdown menu becomes inline inside the nav column */
    .nav-menu .dropdown-menu {
        position: static;
        display: none;
        box-shadow: none;
        padding-left: var(--spacing-4);
        padding-right: var(--spacing-4);
    }
    .nav-menu .dropdown.open .dropdown-menu {
        display: block;
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-xl);
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-3);
    }

    .profile-container {
        width: 300px;
        height: 300px;
    }

    .section-title {
        font-size: var(--font-size-3xl);
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        padding-left: var(--spacing-12);
    }

    .timeline-marker {
        left: 12px;
    }

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

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

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-4);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-3);
    }

    section {
        padding: var(--spacing-16) 0;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .profile-container {
        width: 250px;
        height: 250px;
    }

    .contact-form {
        padding: var(--spacing-6);
    }
}