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

:root {
    /* Light Theme Colors */
    --primary-color: #3b82f6;
    --primary-light: #60a5fa;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 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 */
    --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;
    --spacing-24: 6rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Border Radius */
    --border-radius-sm: 0.375rem;
    --border-radius: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    /* Container */
    --container-padding: 1rem;
    --container-max-width: 1200px;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-4);
    color: var(--text-secondary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

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

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-normal);
}

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

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

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-8);
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-fast);
}

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

.theme-toggle {
    background: none;
    border: none;
    font-size: var(--font-size-lg);
    cursor: pointer;
    padding: var(--spacing-2);
    border-radius: var(--border-radius);
    transition: background-color var(--transition-fast);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.floating-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), var(--primary-light));
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 60px;
    height: 60px;
    top: 60%;
    right: 10%;
    animation-delay: 2s;
}

.shape-3 {
    width: 100px;
    height: 100px;
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

.shape-4 {
    width: 120px;
    height: 120px;
    top: 30%;
    right: 30%;
    animation-delay: 1s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}

.hero-container {
    width: 100%;
    padding-top: 4rem;
}

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

.hero-image {
    order: 2;
    display: flex;
    justify-content: center;
}

.profile-image {
    width: 400px;
    height: 400px;
    border-radius: 50%;
    object-fit: cover;
    border: 6px solid var(--primary-color);
    box-shadow: 0 20px 60px var(--shadow-color);
    animation: profileFloat 6s ease-in-out infinite;
}

@keyframes profileFloat {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.hero-text {
    order: 1;
}

.hero-title {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-4);
    background: linear-gradient(135deg, var(--text-primary), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    /* Fallback for older browsers */
    color: var(--text-primary);
}

.typing-container {
    margin-bottom: var(--spacing-6);
    height: 3rem;
    display: flex;
    align-items: center;
}

.typing-text {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--primary-color);
}

.cursor {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    animation: blink 1s infinite;
}

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

.hero-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-8);
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-4);
}

/* Section Styles */
section {
    padding: var(--spacing-24) 0;
}

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

.section-title {
    margin-bottom: var(--spacing-4);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 2px;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-muted);
}

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

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

.about-text h3 {
    margin-bottom: var(--spacing-4);
    color: var(--primary-color);
}

.about-highlights {
    display: flex;
    gap: var(--spacing-8);
    margin-top: var(--spacing-8);
}

.highlight {
    text-align: center;
}

.highlight-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
}

.highlight-text {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.about-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.info-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-6);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px var(--shadow-color);
}

.info-card h4 {
    margin-bottom: var(--spacing-2);
    color: var(--primary-color);
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
}

.skill-category {
    background-color: var(--bg-primary);
    padding: var(--spacing-8);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px var(--shadow-color);
}

.skill-category h3 {
    margin-bottom: var(--spacing-6);
    color: var(--primary-color);
    text-align: center;
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.skill-name {
    font-weight: 600;
    color: var(--text-primary);
}

.skill-bar {
    height: 8px;
    background-color: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 4px;
    width: 0;
    transition: width 1s ease-out;
}

/* Experience Section */
.experience {
    background-color: var(--bg-secondary);
}

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

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

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

.timeline-item::before {
    content: '';
    position: absolute;
    left: 1.5rem;
    top: 0;
    width: 1rem;
    height: 1rem;
    background-color: var(--primary-color);
    border-radius: 50%;
    border: 3px solid var(--bg-primary);
}

.timeline-date {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-2);
}

.timeline-content {
    background-color: var(--bg-primary);
    padding: var(--spacing-6);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px var(--shadow-color);
}

.timeline-content h3 {
    margin-bottom: var(--spacing-2);
}

.timeline-company {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
}

.timeline-content ul {
    margin-top: var(--spacing-4);
    padding-left: var(--spacing-5);
}

.timeline-content li {
    margin-bottom: var(--spacing-2);
    color: var(--text-secondary);
}

.certifications {
    margin-top: var(--spacing-16);
}

.certifications h3 {
    text-align: center;
    margin-bottom: var(--spacing-8);
    color: var(--primary-color);
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-6);
}

.cert-item {
    background-color: var(--bg-primary);
    padding: var(--spacing-6);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    text-align: center;
    box-shadow: 0 4px 20px var(--shadow-color);
}

.cert-item h4 {
    margin-bottom: var(--spacing-2);
    color: var(--text-primary);
}

.cert-item p {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0;
}

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

.project-card {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px var(--shadow-color);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow-color);
}

.project-image {
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-placeholder {
    font-size: 3rem;
    color: white;
}

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

.project-content h3 {
    margin-bottom: var(--spacing-3);
    color: var(--text-primary);
}

.project-content p {
    margin-bottom: var(--spacing-4);
    font-size: var(--font-size-sm);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
}

.project-tech span {
    background-color: var(--bg-secondary);
    color: var(--primary-color);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--border-radius);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.project-links {
    display: flex;
    gap: var(--spacing-4);
}

.project-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.project-link svg {
    transition: transform var(--transition-fast);
}

.project-link:hover svg {
    transform: translateX(2px);
}

/* Contact Section */
.contact {
    background-color: var(--bg-secondary);
}

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

.contact-info h3 {
    margin-bottom: var(--spacing-4);
    color: var(--primary-color);
}

.contact-details {
    margin-top: var(--spacing-8);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-6);
}

.contact-icon {
    font-size: var(--font-size-xl);
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-color);
    border-radius: 50%;
}

.contact-text h4 {
    margin-bottom: var(--spacing-1);
    color: var(--text-primary);
}

.contact-text span,
.contact-text a {
    color: var(--text-secondary);
}

.form {
    background-color: var(--bg-primary);
    padding: var(--spacing-8);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px var(--shadow-color);
}

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

.form-group label {
    display: block;
    margin-bottom: var(--spacing-2);
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-3);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Footer */
.footer {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-8) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer-content p {
    margin-bottom: var(--spacing-2);
    color: var(--text-secondary);
}

/* Animations - Content visible by default for legacy browser support */
.fade-in {
    opacity: 1;
    transform: translateY(0);
}

.fade-in.animate-in {
    animation: fadeInAnimation 0.8s ease forwards;
}

.slide-in-left {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-left.animate-in {
    animation: slideInLeftAnimation 0.8s ease forwards;
}

.slide-in-right {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right.animate-in {
    animation: slideInRightAnimation 0.8s ease forwards;
}

/* Animation keyframes */
@keyframes fadeInAnimation {
    0% {
        opacity: 0.3;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeftAnimation {
    0% {
        opacity: 0.3;
        transform: translateX(-30px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRightAnimation {
    0% {
        opacity: 0.3;
        transform: translateX(30px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
        --spacing-16: 2rem;
        --spacing-20: 3rem;
        --spacing-24: 4rem;
    }

    .nav-menu {
        position: fixed;
        top: 4rem;
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        border: 1px solid var(--border-color);
        flex-direction: column;
        padding: var(--spacing-6);
        gap: var(--spacing-4);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

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

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

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

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(8px, -8px);
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-8);
    }

    .hero-image {
        order: 1;
    }

    .hero-text {
        order: 2;
    }

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

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

    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
    }

    .about-highlights {
        justify-content: space-around;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-8);
    }

    .timeline::before {
        left: 1rem;
    }

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

    .timeline-item::before {
        left: 0.5rem;
    }

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

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

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .typing-text {
        font-size: var(--font-size-xl);
    }

    .profile-image {
        width: 200px;
        height: 200px;
    }

    .about-highlights {
        flex-direction: column;
        gap: var(--spacing-4);
    }

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

    .hero-buttons {
        gap: var(--spacing-3);
    }

    .btn {
        padding: var(--spacing-3) var(--spacing-5);
        font-size: var(--font-size-sm);
    }
}