/* ========================================
   CSS Variables & Root Configuration
   ======================================== */
:root {
    --primary-color: #2563eb;
    --secondary-color: #0891b2;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-dark: #0f172a;
    --text-light: #f8fafc;
    --text-muted: #64748b;
    --bg-light: #ffffff;
    --bg-medium: #f1f5f9;
    --bg-dark: #1e293b;
    --border-color: #cbd5e1;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 15px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 35px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
}

[data-theme="dark"] {
    --text-dark: #f1f5f9;
    --text-light: #0f172a;
    --text-muted: #cbd5e1;
    --bg-light: #1e293b;
    --bg-medium: #334155;
    --bg-dark: #0f172a;
    --border-color: #475569;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 4px 12px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 15px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 35px rgba(0, 0, 0, 0.4);
}

/* ========================================
   Global Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-light);
    color: var(--text-dark);
    transition: var(--transition);
    line-height: 1.6;
}

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

/* ========================================
   Theme Toggle Button
   ======================================== */
.theme-toggle {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: var(--text-light);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(20deg);
    box-shadow: var(--shadow-lg);
    background-color: var(--secondary-color);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: sticky;
    top: 0;
    background-color: var(--bg-light);
    box-shadow: var(--shadow);
    z-index: 100;
    transition: var(--transition);
    border-bottom: 1px solid var(--border-color);
}

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

.nav-brand h1 {
    font-size: 1.4rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-menu a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    transition: color 0.3s ease;
}

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

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 6px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background-color: var(--bg-light);
        gap: 0;
        padding: var(--spacing-md);
        box-shadow: var(--shadow);
        display: none;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu a {
        padding: var(--spacing-sm);
        display: block;
    }

    .theme-toggle {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(8, 145, 178, 0.05) 100%);
    padding: var(--spacing-xl) var(--spacing-md);
}

.hero-content {
    max-width: 1000px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-image {
    width: 100%;
    max-width: 350px;
    height: auto;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    object-fit: cover;
    animation: float 3s ease-in-out infinite;
    border: 3px solid var(--primary-color);
}

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

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

.hero-title .typed-text {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-width: 250px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
}

.social-links {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.social-links a {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.social-links a:hover {
    background-color: var(--secondary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.cta-button {
    display: inline-block;
    padding: 12px 32px;
    background-color: var(--primary-color);
    color: var(--text-light);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--primary-color);
    font-size: 1rem;
}

.cta-button:hover {
    background-color: transparent;
    color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-image {
        max-width: 250px;
    }
}

/* ========================================
   Section Styles
   ======================================== */
.section {
    padding: var(--spacing-xl) var(--spacing-md);
    background-color: var(--bg-light);
    border-top: 1px solid var(--border-color);
}

.section:nth-child(odd) {
    background-color: var(--bg-medium);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-dark);
    position: relative;
    padding-bottom: var(--spacing-md);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

/* ========================================
   Education Section
   ======================================== */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.certifications-full-width {
    width: 100%;
    padding: 0 var(--spacing-md);
}

.certifications-full-width .section-title {
    text-align: center;
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

@media (max-width: 480px) {
    .certifications-grid {
        grid-template-columns: 1fr;
    }
}

.education-card {
    background-color: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
    border-left: 4px solid var(--primary-color);
}

.education-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.education-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.education-card h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
    font-weight: 600;
}

.education-card .degree {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.education-card .institution {
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
}

.education-card .highlights {
    list-style: none;
    text-align: left;
    color: var(--text-dark);
}

.education-card .highlights li {
    padding: var(--spacing-xs) 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.education-card .highlights li::before {
    content: '✓ ';
    color: var(--success-color);
    font-weight: bold;
    margin-right: var(--spacing-xs);
}

/* ========================================
   Experience Section
   ======================================== */
.experience-timeline {
    position: relative;
    padding: var(--spacing-lg) 0;
}

.experience-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
}

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

.timeline-marker {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 18px;
    height: 18px;
    background-color: var(--primary-color);
    border-radius: 50%;
    border: 4px solid var(--bg-light);
    top: 0;
    box-shadow: var(--shadow-md);
}

.timeline-content {
    background-color: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: 10px;
    box-shadow: var(--shadow);
    width: 45%;
    margin-left: 0;
    border: 1px solid var(--border-color);
}

.timeline-content:nth-child(2n) {
    margin-left: 55%;
}

.timeline-content h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

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

.timeline-content .period {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-md);
}

.timeline-content .responsibilities {
    list-style: none;
    color: var(--text-dark);
}

.timeline-content .responsibilities li {
    padding: 6px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding-left: var(--spacing-md);
}

.timeline-content .responsibilities li::before {
    content: '→ ';
    color: var(--secondary-color);
    margin-left: -var(--spacing-md);
    margin-right: var(--spacing-sm);
    font-weight: bold;
}

@media (max-width: 768px) {
    .experience-timeline::before {
        left: 10px;
    }

    .timeline-marker {
        left: 10px;
    }

    .timeline-content {
        width: 100%;
        margin-left: 50px;
    }

    .timeline-content:nth-child(2n) {
        margin-left: 50px;
    }
}

/* ========================================
   Projects Section
   ======================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.project-card {
    background-color: var(--bg-light);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
    border: 1px solid var(--border-color);
}

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

.project-header {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.03) 0%, rgba(8, 145, 178, 0.03) 100%);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.project-header h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    flex: 1;
    margin: 0;
}

.project-badge {
    background-color: var(--primary-color);
    color: var(--text-light);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.project-description {
    padding: 0 var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.95rem;
}

.project-tech {
    padding: 0 var(--spacing-lg);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.tech-tag {
    background-color: var(--bg-medium);
    color: var(--primary-color);
    padding: 4px 10px;
    border-radius: 16px;
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.project-details {
    flex: 1;
    padding: 0 var(--spacing-lg);
    list-style: none;
    color: var(--text-dark);
}

.project-details li {
    padding: var(--spacing-xs) 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding-left: var(--spacing-md);
}

.project-details li::before {
    content: '→ ';
    color: var(--primary-color);
    margin-left: -var(--spacing-md);
    margin-right: var(--spacing-sm);
    font-weight: bold;
}

.project-links {
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    border-top: 1px solid var(--border-color);
}

.project-link {
    flex: 1;
    min-width: 150px;
    padding: 10px 16px;
    background-color: var(--primary-color);
    color: var(--text-light);
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    border: 2px solid var(--primary-color);
    font-size: 0.9rem;
}

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

/* ========================================
   Skills Section
   ======================================== */
.competencies-section {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: var(--bg-light);
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.competencies-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.competency-badge {
    display: inline-block;
    padding: 10px 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--text-light);
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.competency-badge:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl));
}

.skills-category {
    background-color: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.category-title {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--primary-color);
    font-weight: 600;
}

.skills-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.skill-item {
    animation: slideInUp 0.6s ease-out both;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.skill-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.skill-name {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.skill-percentage {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.85rem;
}

.skill-bar {
    width: 100%;
    height: 8px;
    background-color: var(--bg-medium);
    border-radius: 10px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 10px;
    transition: width 0.6s ease-out;
}

@media (max-width: 768px) {
    .skills-container {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Contact Section
   ======================================== */
.contact-section {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.03) 0%, rgba(8, 145, 178, 0.03) 100%);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.contact-card {
    background-color: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--secondary-color);
}

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

.contact-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.contact-card h3 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.contact-card h3 a {
    margin-top: 0;
    font-size: inherit;
    font-weight: inherit;
}

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

.contact-card a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
    margin-top: var(--spacing-sm);
}

.contact-card a:hover {
    color: var(--secondary-color);
    transform: translateX(5px);
}

.download-link {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: var(--text-light);
    border-radius: 6px;
    margin-top: var(--spacing-md);
    font-weight: 600;
    transition: var(--transition);
}

.download-link:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background-color: var(--bg-medium);
    color: var(--text-muted);
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.footer p {
    margin: var(--spacing-sm) 0;
}

.heart {
    color: var(--danger-color);
    animation: heartbeat 0.6s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

/* ========================================
   Utilities
   ======================================== */
@media (max-width: 1024px) {
    :root {
        font-size: 15px;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
    }

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

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

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-medium);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* Print Styles */
@media print {
    .theme-toggle,
    .nav-toggle {
        display: none;
    }
}