/* Modern Portfolio - Main Stylesheet */

/* Variables */
:root {
    /* Main color palette - subtle professional colors */
    --primary-color: #3a6ea5;         /* Subtle blue */
    --primary-light: #6e9cd2;         /* Lighter blue */
    --primary-dark: #1e4976;          /* Darker blue */
    --secondary-color: #f0f5fa;       /* Very light blue/gray */
    --accent-color: #4a90e2;          /* Accent blue */
    --text-dark: #2c3e50;             /* Dark blue-gray for text */
    --text-light: #7f8c8d;            /* Light gray for secondary text */
    --background-light: #ffffff;      /* White background */
    --background-alt: #f8f9fa;        /* Light gray background */
    --border-color: #e1e8ed;          /* Light gray border */
    --success-color: #27ae60;         /* Green for success elements */
    --error-color: #e74c3c;           /* Red for error elements */
    
    /* Typography */
    --font-primary: 'Poppins', sans-serif;
    --font-secondary: 'Roboto', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;   /* 4px */
    --spacing-sm: 0.5rem;    /* 8px */
    --spacing-md: 1rem;      /* 16px */
    --spacing-lg: 1.5rem;    /* 24px */
    --spacing-xl: 2rem;      /* 32px */
    --spacing-xxl: 3rem;     /* 48px */
    
    /* Border radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--background-light);
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

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

button, input, textarea {
    font-family: var(--font-primary);
    font-size: 1rem;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--spacing-md);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    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-color: var(--primary-color);
}

.highlight {
    color: var(--primary-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    outline: none;
}

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

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

.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);
    box-shadow: var(--shadow-md);
}

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

header.scrolled {
    box-shadow: var(--shadow-md);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--text-dark);
    font-weight: 500;
    position: relative;
    padding: var(--spacing-xs) 0;
}

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

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

.menu-btn {
    display: none;
    cursor: pointer;
}

.menu-btn__burger {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    border-radius: 5px;
    position: relative;
    transition: all var(--transition-normal);
}

.menu-btn__burger::before,
.menu-btn__burger::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    border-radius: 5px;
    transition: all var(--transition-normal);
}

.menu-btn__burger::before {
    transform: translateY(-8px);
}

.menu-btn__burger::after {
    transform: translateY(8px);
}

/* Hero Section */
.hero {
    padding: 120px 0 var(--spacing-xxl);
    background-color: var(--secondary-color);
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
}

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

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.hero-content h2 {
    font-size: 1.5rem;
    color: var(--text-light);
    font-weight: 400;
    margin-bottom: var(--spacing-md);
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    justify-content: center;
}

.social-icons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.social-icons a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--background-light);
    color: var(--primary-color);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.social-icons a:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-placeholder {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background-color: var(--background-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-weight: 500;
    box-shadow: var(--shadow-md);
    border: 5px solid white;
}

/* About Section */
.about {
    padding: var(--spacing-xxl) 0;
    background-color: var(--background-light);
}

.about-content {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
}

.about-text {
    flex: 2;
    min-width: 300px;
}

.about-stats {
    flex: 1;
    min-width: 250px;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.stat {
    background-color: var(--secondary-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
}

.stat:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.stat-title {
    font-size: 1rem;
    color: var(--text-light);
}

/* Skills Section */
.skills {
    padding: var(--spacing-xxl) 0;
    background-color: var(--background-alt);
}

.skills-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
}

.skill-category {
    flex: 1;
    min-width: 300px;
}

.skill-category h3 {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
}

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

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

.skill-name {
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    display: flex;
    justify-content: space-between;
}

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

.skill-level {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 4px;
    transition: width 1s ease-in-out;
}

/* Education Section */
.education {
    padding: var(--spacing-xxl) 0;
    background-color: var(--background-alt);
}

/* Experience Section */
.experience {
    padding: var(--spacing-xxl) 0;
    background-color: var(--background-light);
}

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

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background-color: var(--border-color);
}

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

.timeline-dot {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--primary-color);
    z-index: 1;
}

.timeline-content {
    position: relative;
    width: calc(50% - 40px);
    padding: var(--spacing-lg);
    background-color: var(--background-light);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.timeline-item:nth-child(odd) .timeline-content {
    left: 0;
}

.timeline-item:nth-child(even) .timeline-content {
    left: calc(50% + 40px);
}

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

.timeline-content h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.timeline-date {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.timeline-description {
    padding-left: var(--spacing-md);
}

.timeline-description li {
    position: relative;
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-sm);
}

.timeline-description li::before {
    content: '•';
    position: absolute;
    left: -10px;
    color: var(--primary-color);
}

/* Projects Section */
.projects {
    padding: var(--spacing-xxl) 0;
    background-color: var(--background-alt);
}

/* Volunteering Section */
.volunteering {
    padding: var(--spacing-xxl) 0;
    background-color: var(--background-light);
}

.volunteering-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.volunteering-card {
    display: flex;
    background-color: var(--secondary-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
}

.volunteering-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.volunteering-icon {
    margin-right: var(--spacing-md);
    font-size: 2rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 50px;
}

.volunteering-info h3 {
    margin-bottom: var(--spacing-xs);
    font-size: 1.1rem;
}

.volunteering-date {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
}

/* Certifications Section */
.certifications {
    padding: var(--spacing-xxl) 0;
    background-color: var(--background-alt);
}

/* Additional Information Section */
.additional-info {
    padding: var(--spacing-xxl) 0;
    background-color: var(--background-light);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.info-card {
    display: flex;
    background-color: var(--secondary-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.info-icon {
    margin-right: var(--spacing-md);
    font-size: 2rem;
    color: var(--primary-color);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    min-width: 50px;
}

.info-content h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

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

.info-list li {
    position: relative;
    padding-left: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.info-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.certification-card {
    display: flex;
    background-color: var(--secondary-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
}

.certification-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.certification-icon {
    margin-right: var(--spacing-md);
    font-size: 2rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 50px;
}

.certification-info h3 {
    margin-bottom: var(--spacing-xs);
    font-size: 1.1rem;
}

.certification-issuer {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
}

.projects-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.filter-btn {
    padding: 0.5rem 1rem;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background-color: var(--background-light);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
}

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

.project-img {
    height: 200px;
    overflow: hidden;
    position: relative;
}

.project-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

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

/* GitHub Project Styling */
.github-project {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--secondary-color);
}

.github-project i {
    font-size: 4rem;
    color: var(--primary-color);
}

.github-profile {
    background-color: var(--background-light);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--primary-color);
}

.github-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.github-profile-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--primary-color);
    font-weight: 600;
    transition: color var(--transition-fast);
}

.github-profile-link:hover {
    color: var(--primary-dark);
}

.github-profile-link i {
    font-size: 1.5rem;
}

.github-bio {
    color: var(--text-light);
    font-size: 0.95rem;
}

.github-cta {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.github-cta p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
}

.project-info {
    padding: var(--spacing-lg);
}

.project-info h3 {
    margin-bottom: var(--spacing-sm);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin: var(--spacing-md) 0;
}

.project-tags span {
    background-color: var(--secondary-color);
    color: var(--primary-color);
    padding: 0.25rem 0.5rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.8rem;
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
    font-size: 0.9rem;
}

.project-links a {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* Contact Section */
.contact {
    padding: var(--spacing-xxl) 0;
    background-color: var(--background-light);
}

.contact-content {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
}

.contact-info {
    flex: 1;
    min-width: 300px;
}

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

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.contact-item h3 {
    margin-bottom: var(--spacing-xs);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--secondary-color);
    color: var(--primary-color);
    transition: all var(--transition-normal);
}

.social-links a:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

.contact-form {
    flex: 1;
    min-width: 300px;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background-color: var(--background-light);
    transition: border-color var(--transition-normal);
}

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

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

/* Footer */
footer {
    background-color: var(--text-dark);
    color: white;
    padding: var(--spacing-lg) 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-5px);
}

/* Responsive Styles */
@media (max-width: 992px) {
    html {
        font-size: 15px;
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        order: 2;
    }
    
    .hero-image {
        order: 1;
        margin-bottom: var(--spacing-lg);
    }
    
    .cta-buttons,
    .social-icons {
        justify-content: center;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-dot {
        left: 30px;
    }
    
    .timeline-content {
        width: calc(100% - 80px);
        left: 80px !important;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 250px;
        height: 100vh;
        background-color: var(--background-light);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: right var(--transition-normal);
        box-shadow: var(--shadow-lg);
        z-index: 1001;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .menu-btn {
        display: block;
        z-index: 1002;
    }
    
    .menu-btn.active .menu-btn__burger {
        background-color: transparent;
    }
    
    .menu-btn.active .menu-btn__burger::before {
        transform: rotate(45deg);
    }
    
    .menu-btn.active .menu-btn__burger::after {
        transform: rotate(-45deg);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .profile-placeholder {
        width: 250px;
        height: 250px;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .contact-content {
        flex-direction: column;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}