/* ============================================
   GITHUB STYLE - VARIABLES
   ============================================ */
:root {
    /* Dark Theme Colors */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-overlay: #30363d;
    
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --text-link: #58a6ff;
    --text-link-hover: #1f6feb;
    
    --border-default: #30363d;
    --border-muted: #21262d;
    
    /* Light Theme Colors */
    --bg-primary-light: #ffffff;
    --bg-secondary-light: #f6f8fa;
    --bg-tertiary-light: #ffffff;
    --bg-overlay-light: #f6f8fa;
    
    --text-primary-light: #24292f;
    --text-secondary-light: #57606a;
    --text-link-light: #0969da;
    --text-link-hover-light: #0550ae;
    
    --border-default-light: #d0d7de;
    --border-muted-light: #d8dee4;
    
    /* Common */
    --font-family: 'Inter', 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 14px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

body.light-mode {
    background-color: var(--bg-primary-light);
    color: var(--text-primary-light);
}

a {
    color: var(--text-link);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--text-link-hover);
    text-decoration: underline;
}

body.light-mode a {
    color: var(--text-link-light);
}

body.light-mode a:hover {
    color: var(--text-link-hover-light);
}

code {
    background-color: var(--bg-tertiary);
    padding: 0.2em 0.4em;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

body.light-mode code {
    background-color: var(--bg-overlay-light);
}

/* ============================================
   MAIN CONTAINER
   ============================================ */
.github-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 120px 40px 32px;
    gap: 40px;
}

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
    position: sticky;
    top: 24px;
    height: fit-content;
}

.profile-section {
    margin-bottom: 16px;
    position: relative;
}

.profile-avatar {
    width: 100%;
    margin-bottom: 16px;
}

.avatar-img {
    width: 100%;
    height: auto;
    border-radius: 50%;
    border: 1px solid var(--border-default);
}

body.light-mode .avatar-img {
    border-color: var(--border-default-light);
}

.profile-info {
    margin-bottom: 8px;
}

.profile-name {
    font-size: 26px;
    font-weight: 600;
    line-height: 1.25;
    color: var(--text-primary);
}

body.light-mode .profile-name {
    color: var(--text-primary-light);
}

.profile-username {
    font-size: 20px;
    font-weight: 300;
    color: var(--text-secondary);
    margin-top: 4px;
}

body.light-mode .profile-username {
    color: var(--text-secondary-light);
}

.profile-bio {
    font-size: 14px;
    color: var(--text-primary);
    margin-top: 8px;
    line-height: 1.5;
}

body.light-mode .profile-bio {
    color: var(--text-primary-light);
}

.btn-theme-toggle {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.2s ease;
}

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

body.light-mode .btn-theme-toggle {
    background: var(--bg-overlay-light);
    border-color: var(--border-default-light);
}

body.light-mode .btn-theme-toggle:hover {
    background: var(--bg-secondary-light);
    border-color: var(--border-muted-light);
}

.profile-details {
    margin-top: 16px;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--text-primary);
}

body.light-mode .detail-item {
    color: var(--text-primary-light);
}

.detail-item .icon {
    fill: var(--text-secondary);
    flex-shrink: 0;
}

body.light-mode .detail-item .icon {
    fill: var(--text-secondary-light);
}

.achievements {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border-default);
}

body.light-mode .achievements {
    border-color: var(--border-default-light);
}

.achievements h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

body.light-mode .achievements h3 {
    color: var(--text-primary-light);
}

.achievement-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.badge {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.badge:hover {
    transform: scale(1.1);
}

body.light-mode .badge {
    background: var(--bg-overlay-light);
    border-color: var(--border-default-light);
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
    min-width: 0;
}

.profile-header-mobile {
    display: none;
}

/* Navigation Menu */
.main-nav {
    position: sticky;
    top: 0;
    background: var(--bg-primary);
    border-bottom: 2px solid var(--border-default);
    margin-bottom: 24px;
    padding: 16px;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: rgba(13, 17, 23, 0.95);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    margin-left: -16px;
    margin-right: -16px;
    margin-top: -16px;
}

body.light-mode .main-nav {
    background: rgba(246, 248, 250, 0.95);
    border-color: var(--border-default-light);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.nav-list {
    display: flex;
    gap: 6px;
    list-style: none;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
}

.nav-item {
    margin: 0;
}

.nav-link {
    display: block;
    padding: 10px 18px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: linear-gradient(90deg, #58a6ff 0%, #1f6feb 100%);
    transition: transform 0.3s ease;
    border-radius: 2px;
}

.nav-link:hover::before {
    transform: translateX(-50%) scaleX(1);
}

.nav-link:hover {
    background: var(--bg-tertiary);
    color: var(--text-link);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(88, 166, 255, 0.15);
}

.nav-link.active {
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.15) 0%, rgba(31, 111, 235, 0.15) 100%);
    color: var(--text-link);
    border: 1px solid var(--text-link);
    box-shadow: 0 0 16px rgba(88, 166, 255, 0.25), 0 2px 8px rgba(88, 166, 255, 0.1);
}

body.light-mode .nav-link {
    color: var(--text-secondary-light);
}

body.light-mode .nav-link::before {
    background: linear-gradient(90deg, #0969da 0%, #0550ae 100%);
}

body.light-mode .nav-link:hover {
    background: var(--bg-overlay-light);
    color: var(--text-link-light);
    box-shadow: 0 4px 8px rgba(9, 105, 218, 0.1);
}

body.light-mode .nav-link.active {
    background: linear-gradient(135deg, rgba(9, 105, 218, 0.15) 0%, rgba(5, 80, 174, 0.15) 100%);
    color: var(--text-link-light);
    border-color: var(--text-link-light);
    box-shadow: 0 0 16px rgba(9, 105, 218, 0.2), 0 2px 8px rgba(9, 105, 218, 0.08);
}

.section-header {
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-default);
    padding-bottom: 8px;
}

body.light-mode .section-header h2 {
    color: var(--text-primary-light);
    border-color: var(--border-default-light);
}

/* README Section */
.readme-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    padding: 24px;
    margin-bottom: 24px;
}

body.light-mode .readme-section {
    background: var(--bg-tertiary-light);
    border-color: var(--border-default-light);
}

.readme-content {
    font-size: 16px;
    line-height: 1.8;
}

.lead-text {
    text-align: justify;
    color: var(--text-primary);
}

body.light-mode .lead-text {
    color: var(--text-primary-light);
}

/* Tech Stack Section */
.tech-stack-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    padding: 24px;
    margin-bottom: 24px;
}

body.light-mode .tech-stack-section {
    background: var(--bg-tertiary-light);
    border-color: var(--border-default-light);
}

.tech-table {
    overflow-x: auto;
}

.tech-table table {
    width: 100%;
    border-collapse: collapse;
}

.tech-table tr {
    border-bottom: 1px solid var(--border-muted);
}

body.light-mode .tech-table tr {
    border-color: var(--border-muted-light);
}

.tech-table tr:last-child {
    border-bottom: none;
}

.tech-table td {
    padding: 12px 8px;
    vertical-align: top;
}

.tech-table .category {
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    width: 200px;
}

body.light-mode .tech-table .category {
    color: var(--text-primary-light);
}

.tech-table .technologies {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tech-badge {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: 12px;
    font-size: 13px;
    color: var(--text-primary);
    white-space: nowrap;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tech-badge:hover {
    transform: translateY(-2px);
    border-color: #ffd700;
    box-shadow: 0 4px 12px rgba(255, 215, 0, 0.25);
    color: #ffd700;
}

body.light-mode .tech-badge {
    background: var(--bg-overlay-light);
    border-color: var(--border-default-light);
    color: var(--text-primary-light);
}

body.light-mode .tech-badge:hover {
    border-color: #d4af37;
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
    color: #d4af37;
}

.gist-link {
    font-size: 14px;
}

/* Experience Section */
.experience-section {
    margin-bottom: 24px;
}

.experience-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    padding: 24px;
    margin-bottom: 16px;
}

body.light-mode .experience-card {
    background: var(--bg-tertiary-light);
    border-color: var(--border-default-light);
}

.exp-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

body.light-mode .exp-header h3 {
    color: var(--text-primary-light);
}

.company {
    font-size: 14px;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 8px;
}

body.light-mode .company {
    color: var(--text-secondary-light);
}

.exp-date {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

body.light-mode .exp-date {
    color: var(--text-secondary-light);
}

.exp-details {
    list-style: disc;
    padding-left: 24px;
}

.exp-details li {
    margin-bottom: 8px;
    color: var(--text-primary);
    line-height: 1.6;
}

body.light-mode .exp-details li {
    color: var(--text-primary-light);
}

.exp-tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-muted);
}

body.light-mode .exp-tech-stack {
    border-color: var(--border-muted-light);
}

.exp-tech-badge {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-muted);
    border-radius: 12px;
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
}

body.light-mode .exp-tech-badge {
    background: #e8eaed;
    border-color: #c1c6cc;
    color: #5f6368;
}

/* Education Section */
.education-section {
    margin-bottom: 24px;
}

.education-list {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    padding: 16px;
}

body.light-mode .education-list {
    background: var(--bg-tertiary-light);
    border-color: var(--border-default-light);
}

.education-item {
    display: flex;
    gap: 16px;
    padding: 16px;
    border-bottom: 1px solid var(--border-muted);
}

body.light-mode .education-item {
    border-color: var(--border-muted-light);
}

.education-item:last-child {
    border-bottom: none;
}

.edu-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.edu-content h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

body.light-mode .edu-content h4 {
    color: var(--text-primary-light);
}

.edu-institution {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

body.light-mode .edu-institution {
    color: var(--text-secondary-light);
}

.edu-date {
    font-size: 13px;
    color: var(--text-secondary);
}

body.light-mode .edu-date {
    color: var(--text-secondary-light);
}

/* Projects Section */
.projects-section {
    margin-bottom: 24px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}

.project-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 12px;
    padding: 24px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #58a6ff 0%, #1f6feb 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-card:hover {
    transform: translateY(-4px);
    border-color: var(--text-link);
    box-shadow: 0 8px 24px rgba(88, 166, 255, 0.15);
}

body.light-mode .project-card {
    background: var(--bg-tertiary-light);
    border-color: var(--border-default-light);
}

body.light-mode .project-card::before {
    background: linear-gradient(90deg, #0969da 0%, #0550ae 100%);
}

body.light-mode .project-card:hover {
    border-color: var(--text-link-light);
    box-shadow: 0 8px 24px rgba(9, 105, 218, 0.15);
}

.project-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.project-card h3::before {
    content: '📦';
    font-size: 22px;
}

.project-card h3 a {
    color: var(--text-link);
    text-decoration: none;
    transition: color 0.2s ease;
    position: relative;
}

.project-card h3 a::after {
    content: '↗';
    opacity: 0;
    margin-left: 4px;
    transition: opacity 0.2s ease;
    font-size: 16px;
}

.project-card:hover h3 a::after {
    opacity: 1;
}

body.light-mode .project-card h3 a {
    color: var(--text-link-light);
}

.project-description {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
    font-weight: 500;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-muted);
}

body.light-mode .project-description {
    color: var(--text-secondary-light);
    border-color: var(--border-muted-light);
}

.project-features {
    list-style: none;
    padding-left: 0;
    font-size: 13px;
    flex-grow: 1;
}

.project-features li {
    margin-bottom: 8px;
    color: var(--text-primary);
    padding-left: 24px;
    position: relative;
    line-height: 1.5;
}

.project-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--text-link);
    font-weight: bold;
    font-size: 14px;
}

body.light-mode .project-features li {
    color: var(--text-primary-light);
}

body.light-mode .project-features li::before {
    color: var(--text-link-light);
}

/* Footer */
.github-footer {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border-default);
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
}

body.light-mode .github-footer {
    border-color: var(--border-default-light);
    color: var(--text-secondary-light);
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    color: var(--text-link);
}

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

.scroll-to-top:hover {
    transform: translateY(-4px);
    background: var(--bg-overlay);
    border-color: var(--text-link);
    box-shadow: 0 6px 16px rgba(88, 166, 255, 0.25);
}

.scroll-to-top:active {
    transform: translateY(-2px);
}

body.light-mode .scroll-to-top {
    background: var(--bg-overlay-light);
    border-color: var(--border-default-light);
    color: var(--text-link-light);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

body.light-mode .scroll-to-top:hover {
    background: var(--bg-secondary-light);
    border-color: var(--text-link-light);
    box-shadow: 0 6px 16px rgba(9, 105, 218, 0.2);
}

.footer-links {
    margin-top: 8px;
}

.footer-links a {
    margin: 0 8px;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .github-container {
        grid-template-columns: 1fr;
        padding: 16px;
    }
    
    .sidebar {
        position: relative;
        top: 0;
    }
    
    .profile-header-mobile {
        display: block;
        margin-bottom: 24px;
    }
    
    .profile-header-mobile h1 {
        font-size: 28px;
        color: var(--text-primary);
    }
    
    body.light-mode .profile-header-mobile h1 {
        color: var(--text-primary-light);
    }

    .main-nav {
        margin-left: -16px;
        margin-right: -16px;
        padding: 12px 16px;
    }

    .nav-list {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .nav-list::-webkit-scrollbar {
        display: none;
    }
}

@media (max-width: 768px) {
    .github-container {
        padding: 12px;
    }
    
    .readme-section,
    .tech-stack-section,
    .experience-card,
    .education-list {
        padding: 16px;
    }
    
    .tech-table .category {
        width: auto;
        display: block;
        margin-bottom: 8px;
    }
    
    .tech-table td {
        display: block;
        padding: 8px 0;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .profile-name {
        font-size: 22px;
    }
    
    .profile-username {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .github-container {
        padding: 8px;
    }
    
    .section-header h2 {
        font-size: 18px;
    }
    
    .readme-content {
        font-size: 14px;
    }
    
    .experience-card h3 {
        font-size: 16px;
    }
}