:root {
    --bg-color: #f8fafc;
    --bg-gradient-start: #f1f5f9;
    --bg-gradient-end: #f8fafc;
    --surface-color: #ffffff;
    --surface-hover: #f3f4f6;
    --border-color: #d0d7de;
    --text-primary: #24292f;
    --text-secondary: #57606a;
    --text-muted: #8c959f;
    --accent-color: #0969da;
    --accent-hover: #0550ae;
    --success-color: #1a7f37;
    --warning-color: #9a6700;
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    --radius: 12px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 50%, #eef2ff 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(9, 105, 218, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(9, 105, 218, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(9, 105, 218, 0.02) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(9, 105, 218, 0.02) 1px, transparent 1px),
        radial-gradient(circle at 75% 75%, rgba(9, 105, 218, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

/* Navigation */
.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    text-decoration: none;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--accent-color);
}

.nav-links a.active {
    color: var(--accent-color);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-color);
    border-radius: 2px;
}

/* Profile Header */
.profile-header {
    background: var(--surface-color);
    border-radius: var(--radius);
    padding: 2.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.profile-content {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.profile-image img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 4px solid var(--border-color);
    object-fit: cover;
}

.profile-info {
    flex: 1;
}

.profile-info h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bio {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    max-width: 600px;
}

.location {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.profile-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

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

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.profile-links {
    display: flex;
    gap: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
    border: 1px solid transparent;
}

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

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

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

.btn-secondary:hover {
    background: var(--surface-hover);
    border-color: var(--accent-color);
}

/* Filters */
.filters {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-group label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.filter-group select {
    background: var(--surface-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.filter-group select:hover {
    border-color: var(--accent-color);
}

.filter-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

/* Section Titles */
.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-title::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--accent-color);
    border-radius: 2px;
}

/* Repo Grid */
.repo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

/* Repo Card */
.repo-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.repo-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-color);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
}

.repo-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.repo-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-color);
    text-decoration: none;
    word-break: break-word;
    line-height: 1.3;
}

.repo-name:hover {
    text-decoration: underline;
}

.repo-visibility {
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.repo-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    line-height: 1.5;
    flex-grow: 1;
}

.repo-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    margin-bottom: 0.75rem;
}

.language {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.language-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.repo-stats {
    display: flex;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.repo-stat {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.repo-stat svg {
    width: 16px;
    height: 16px;
}

.repo-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.topic {
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
    background: #ddf4ff;
    color: var(--accent-color);
    border-radius: 12px;
    border: 1px solid #b6e3ff;
}

/* Pinned Section */
.pinned-section {
    margin-bottom: 1rem;
}

.pinned-section .repo-card {
    border-left: 3px solid var(--accent-color);
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

/* Loading State */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .profile-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .profile-stats {
        justify-content: center;
    }
    
    .profile-links {
        justify-content: center;
    }
    
    .repo-grid {
        grid-template-columns: 1fr;
    }
    
    .filters {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Language Colors */
.language-javascript { background-color: #f1e05a; }
.language-typescript { background-color: #2b7489; }
.language-python { background-color: #3572A5; }
.language-java { background-color: #b07219; }
.language-go { background-color: #00ADD8; }
.language-rust { background-color: #dea584; }
.language-cpp { background-color: #f34b7d; }
.language-c { background-color: #555555; }
.language-ruby { background-color: #701516; }
.language-php { background-color: #4F5D95; }
.language-swift { background-color: #F05138; }
.language-kotlin { background-color: #A97BFF; }
.language-html { background-color: #e34c26; }
.language-css { background-color: #563d7c; }
.language-shell { background-color: #89e051; }
.language-default { background-color: #8b949e; }

/* Landing Page - Hero Section */
.hero {
    padding: 4rem 0;
    margin-bottom: 2rem;
}

.hero-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-greeting {
    font-size: 1.2rem;
    color: var(--accent-color);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.hero-name {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.1;
}

.hero-title {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2rem;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

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

.hero-image img {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    border: 6px solid var(--surface-color);
    box-shadow: 0 20px 40px rgba(9, 105, 218, 0.15);
    object-fit: cover;
}

/* Quick Stats */
.quick-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-color);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

/* Skills Preview */
.skills-preview {
    margin-bottom: 3rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.skill-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

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

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

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

/* CTA Section */
.cta-section {
    text-align: center;
    padding: 4rem 2rem;
    background: linear-gradient(135deg, var(--surface-color) 0%, #f0f7ff 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 2rem;
}

.cta-section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.cta-section p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

/* Page Header */
.page-header {
    text-align: center;
    padding: 3rem 0;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.page-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* About Page */
.about-content {
    margin-bottom: 2rem;
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
}

.about-section {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.about-section h2 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-primary);
}

.about-section p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

/* Experience */
.experience-item {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.experience-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.experience-header {
    margin-bottom: 1rem;
}

.experience-header h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.experience-header .company {
    color: var(--accent-color);
    font-weight: 500;
}

.experience-header .date {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

.experience-item ul {
    margin-left: 1.5rem;
    color: var(--text-secondary);
}

.experience-item li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* Education */
.education-item {
    margin-bottom: 1.5rem;
}

.education-item:last-child {
    margin-bottom: 0;
}

.education-item h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.education-item .school {
    color: var(--accent-color);
    font-weight: 500;
    display: block;
}

.education-item .date {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0.25rem 0;
}

.education-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 0.5rem;
}

/* Sidebar */
.about-sidebar {
    position: sticky;
    top: 2rem;
    height: fit-content;
}

.sidebar-section {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.sidebar-section h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
}

.contact-list {
    list-style: none;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.contact-list a {
    color: var(--accent-color);
    text-decoration: none;
}

.contact-list a:hover {
    text-decoration: underline;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    background: #ddf4ff;
    color: var(--accent-color);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid #b6e3ff;
}

.language-list {
    list-style: none;
}

.language-list li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
}

.lang-level {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.sidebar-section p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Responsive Updates */
@media (max-width: 768px) {
    .main-nav {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem 0;
    }

    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-name {
        font-size: 2.5rem;
    }

    .hero-image {
        order: -1;
    }

    .hero-image img {
        width: 200px;
        height: 200px;
    }

    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }

    .quick-stats {
        grid-template-columns: 1fr;
    }

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

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

    .about-sidebar {
        position: static;
    }

    .page-header h1 {
        font-size: 2rem;
    }
}