/* CSS Variables - GitHub Dark Theme */
:root {
    --color-canvas-default: #0d1117;
    --color-canvas-subtle: #161b22;
    --color-border-default: #30363d;
    --color-border-muted: #21262d;
    --color-fg-default: #c9d1d9;
    --color-fg-muted: #8b949e;
    --color-accent-fg: #58a6ff;
    --color-success-fg: #3fb950;
    --color-attention-fg: #d29922;
    --color-danger-fg: #f85149;
    --color-done-fg: #a371f7;
    --color-btn-text: #c9d1d9;
    --color-btn-bg: #21262d;
    --color-btn-border: #30363d;
    --color-btn-hover-bg: #30363d;
    --color-btn-primary-text: #ffffff;
    --color-btn-primary-bg: #238636;
    --color-btn-primary-border: #2ea043;
    --color-btn-primary-hover-bg: #2ea043;
    --color-header-bg: #161b22;
    --color-header-border: #30363d;
    --color-topic-tag-bg: #0d1117;
    --color-topic-tag-border: #30363d;
    --color-topic-tag-hover-bg: #1f242c;
    --color-lang-dot-js: #f1e05a;
    --color-lang-dot-ts: #3178c6;
    --color-lang-dot-html: #e34c26;
    --color-lang-dot-css: #563d7c;
    --color-lang-dot-py: #3572A5;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    --border-radius: 6px;
    --border-radius-large: 12px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-canvas-default);
    color: var(--color-fg-default);
    line-height: 1.6;
    font-size: 14px;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-header-bg);
    border-bottom: 1px solid var(--color-header-border);
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 56px;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-fg-default);
    text-decoration: none;
    font-family: 'Courier New', monospace;
}

.logo:hover {
    color: var(--color-accent-fg);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-links a {
    color: var(--color-fg-default);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
    font-weight: 500;
}

.nav-links a:hover {
    background-color: var(--color-btn-hover-bg);
    color: var(--color-accent-fg);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 20px;
    height: 2px;
    background-color: var(--color-fg-default);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    padding-top: 120px;
    padding-bottom: 60px;
    background: linear-gradient(180deg, var(--color-canvas-subtle) 0%, var(--color-canvas-default) 100%);
}

.profile-header {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 32px;
    align-items: start;
    margin-bottom: 48px;
}

.avatar-container {
    position: relative;
    text-align: center;
}

.avatar {
    width: 260px;
    height: 260px;
    border-radius: 50%;
    overflow: hidden;
    border: 1px solid var(--color-border-default);
    background-color: var(--color-canvas-subtle);
}

.avatar svg {
    width: 100%;
    height: 100%;
}

.status-badge {
    display: inline-block;
    margin-top: 12px;
    padding: 4px 12px;
    background-color: rgba(63, 185, 80, 0.1);
    color: var(--color-success-fg);
    border: 1px solid rgba(63, 185, 80, 0.3);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 500;
}

.profile-info h1 {
    font-size: 40px;
    font-weight: 700;
    color: var(--color-fg-default);
    margin-bottom: 8px;
}

.tagline {
    font-size: 18px;
    color: var(--color-fg-muted);
    margin-bottom: 8px;
}

.location {
    color: var(--color-fg-muted);
    margin-bottom: 24px;
}

.stats {
    display: flex;
    gap: 32px;
    margin-top: 24px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--color-accent-fg);
}

.stat-label {
    font-size: 12px;
    color: var(--color-fg-muted);
}

.bio-section {
    background-color: var(--color-canvas-subtle);
    border: 1px solid var(--color-border-default);
    border-radius: var(--border-radius-large);
    padding: 32px;
}

.bio-section h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-fg-default);
}

.bio-section p {
    color: var(--color-fg-muted);
    margin-bottom: 16px;
    line-height: 1.8;
}

.bio-section p:last-child {
    margin-bottom: 0;
}

/* Sections */
.section {
    padding: 60px 0;
    border-top: 1px solid var(--color-border-muted);
}

.section-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 32px;
    color: var(--color-fg-default);
}

.icon {
    width: 20px;
    height: 20px;
    color: var(--color-fg-muted);
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.skill-category {
    background-color: var(--color-canvas-subtle);
    border: 1px solid var(--color-border-default);
    border-radius: var(--border-radius-large);
    padding: 24px;
}

.skill-category h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--color-fg-default);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--color-topic-tag-bg);
    border: 1px solid var(--color-topic-tag-border);
    border-radius: 50px;
    font-size: 12px;
    color: var(--color-accent-fg);
    transition: all 0.2s ease;
}

.skill-tag:hover {
    background-color: var(--color-topic-tag-hover-bg);
    border-color: var(--color-accent-fg);
}

.skill-tag-small {
    display: inline-block;
    padding: 2px 8px;
    background-color: var(--color-topic-tag-bg);
    border: 1px solid var(--color-topic-tag-border);
    border-radius: 50px;
    font-size: 11px;
    color: var(--color-fg-muted);
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 16px;
}

.project-card {
    background-color: var(--color-canvas-subtle);
    border: 1px solid var(--color-border-default);
    border-radius: var(--border-radius-large);
    padding: 20px;
    transition: all 0.2s ease;
    cursor: pointer;
}

.project-card:hover {
    border-color: var(--color-fg-muted);
    transform: translateY(-2px);
}

.project-card.pinned {
    border-color: var(--color-accent-fg);
}

.project-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.repo-icon {
    width: 16px;
    height: 16px;
    color: var(--color-fg-muted);
}

.project-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-accent-fg);
}

.badge {
    padding: 2px 8px;
    border-radius: 50px;
    font-size: 11px;
    font-weight: 500;
    border: 1px solid;
}

.badge.public {
    background-color: rgba(201, 209, 217, 0.1);
    color: var(--color-fg-muted);
    border-color: var(--color-border-default);
}

.badge.private {
    background-color: rgba(210, 153, 34, 0.1);
    color: var(--color-attention-fg);
    border-color: rgba(210, 153, 34, 0.3);
}

.project-description {
    font-size: 13px;
    color: var(--color-fg-muted);
    margin-bottom: 16px;
    line-height: 1.6;
    min-height: 42px;
}

.project-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--color-fg-muted);
    margin-bottom: 12px;
}

.language {
    display: flex;
    align-items: center;
    gap: 6px;
}

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

.stars, .forks {
    display: flex;
    align-items: center;
    gap: 4px;
}

.stars svg, .forks svg {
    width: 14px;
    height: 14px;
}

.project-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

.topic {
    padding: 4px 12px;
    background-color: var(--color-topic-tag-bg);
    border: 1px solid var(--color-topic-tag-border);
    border-radius: 50px;
    font-size: 12px;
    color: var(--color-accent-fg);
    text-decoration: none;
    transition: all 0.2s ease;
}

.topic:hover {
    background-color: var(--color-topic-tag-hover-bg);
    border-color: var(--color-accent-fg);
}

.project-updated {
    font-size: 11px;
    color: var(--color-fg-muted);
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--color-border-default);
}

.timeline-item {
    position: relative;
    margin-bottom: 32px;
}

.timeline-marker {
    position: absolute;
    left: -28px;
    top: 4px;
    width: 18px;
    height: 18px;
    background-color: var(--color-canvas-subtle);
    border: 2px solid var(--color-accent-fg);
    border-radius: 50%;
}

.timeline-content {
    background-color: var(--color-canvas-subtle);
    border: 1px solid var(--color-border-default);
    border-radius: var(--border-radius-large);
    padding: 24px;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    flex-wrap: wrap;
    gap: 8px;
}

.timeline-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-fg-default);
}

.company {
    font-size: 14px;
    color: var(--color-accent-fg);
}

.timeline-date {
    font-size: 12px;
    color: var(--color-fg-muted);
    margin-bottom: 12px;
}

.timeline-content p {
    font-size: 13px;
    color: var(--color-fg-muted);
    margin-bottom: 12px;
    line-height: 1.6;
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-info p {
    color: var(--color-fg-muted);
    margin-bottom: 24px;
    line-height: 1.8;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-accent-fg);
    text-decoration: none;
    padding: 12px;
    background-color: var(--color-canvas-subtle);
    border: 1px solid var(--color-border-default);
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
}

.contact-link:hover {
    border-color: var(--color-accent-fg);
    background-color: var(--color-btn-hover-bg);
}

.contact-link svg {
    width: 20px;
    height: 20px;
}

.contact-form {
    background-color: var(--color-canvas-subtle);
    border: 1px solid var(--color-border-default);
    border-radius: var(--border-radius-large);
    padding: 32px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-fg-default);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    background-color: var(--color-canvas-default);
    border: 1px solid var(--color-border-default);
    border-radius: var(--border-radius);
    color: var(--color-fg-default);
    font-family: inherit;
    font-size: 14px;
    transition: all 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent-fg);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background-color: var(--color-btn-primary-bg);
    color: var(--color-btn-primary-text);
    border: 1px solid var(--color-btn-primary-border);
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
    justify-content: center;
}

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

.btn-primary svg {
    width: 16px;
    height: 16px;
}

/* Footer */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--color-border-muted);
    margin-top: 60px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-content p {
    color: var(--color-fg-muted);
    font-size: 13px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--color-fg-muted);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s ease;
}

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

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        background-color: var(--color-header-bg);
        border-bottom: 1px solid var(--color-header-border);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
    }

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

    .mobile-menu-btn {
        display: flex;
    }

    .profile-header {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .avatar-container {
        margin: 0 auto;
    }

    .stats {
        justify-content: center;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

    .timeline-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .profile-info h1 {
        font-size: 28px;
    }

    .tagline {
        font-size: 16px;
    }

    .stats {
        flex-direction: column;
        gap: 16px;
    }

    .bio-section,
    .skill-category,
    .project-card,
    .timeline-content,
    .contact-form {
        padding: 20px;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeIn 0.6s ease-out;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-canvas-default);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border-default);
    border-radius: 4px;
}

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

/* Selection */
::selection {
    background-color: rgba(88, 166, 255, 0.3);
    color: var(--color-fg-default);
}