:root {
    --bg-color: #ffffff;
    --text-main: #1f2328;
    --text-muted: #656d76;
    --sidebar-bg: #f6f8fa;
    --border-color: #d0d7de;
    --accent: #bc4c00;
    --card-bg: #ffffff;
    --card-hover: #f6f8fa;
    --tag-bg: #eff1f3;
    --nav-hover: #eaeef2;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0d1117;
        --text-main: #e6edf3;
        --text-muted: #848d97;
        --sidebar-bg: #010409;
        --border-color: #21262d;
        --accent: #f78166;
        --card-bg: #161b22;
        --card-hover: #1c2128;
        --tag-bg: #21262d;
        --nav-hover: #161b22;
    }
}

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

html, body {
    height: 100%;
    overflow: hidden;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

@media (max-width: 820px) {
    html, body {
        height: auto;
        overflow-y: auto;
    }
}

a {
    color: var(--text-main);
    text-decoration: none;
    transition: color 0.15s ease;
}

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

/* Layout: 100vh Master Container */
.container {
    display: flex;
    height: 100vh;
    max-width: 1180px;
    margin: 0 auto;
    background-color: var(--bg-color);
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    overflow: hidden;
}

@media (max-width: 820px) {
    .container {
        height: auto;
        overflow: visible;
        flex-direction: column;
        border-left: none;
        border-right: none;
    }
}

/* Sidebar (Left) */
.sidebar {
    width: 290px;
    background-color: var(--sidebar-bg);
    padding: 3rem 1.75rem;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
    height: 100vh;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
    flex-shrink: 0;
}

@media (max-width: 820px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 2.25rem 1.5rem;
    }
}

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

.avatar-container {
    width: 105px;
    height: 105px;
    margin-bottom: 1rem;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid var(--border-color);
    background-color: var(--card-bg);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.avatar-container:hover {
    transform: scale(1.03);
    border-color: var(--accent);
}

.avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.name {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-main);
    margin-bottom: 0.2rem;
}

.title {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
}

/* Sidebar Navigation Menu */
.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.25rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.45rem 0.75rem;
    border-radius: 6px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.15s ease;
}

.nav-link i {
    width: 16px;
    text-align: center;
    font-size: 0.82rem;
}

.nav-link:hover {
    background-color: var(--nav-hover);
    color: var(--text-main);
}

.nav-link.active {
    background-color: var(--nav-hover);
    color: var(--accent);
    font-weight: 600;
}

/* Contact Info */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1.25rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.contact-item i {
    width: 16px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.82rem;
}

.contact-item a {
    color: var(--text-muted);
}

.contact-item a:hover {
    color: var(--accent);
}

.sidebar-footer {
    margin-top: auto;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    opacity: 0.8;
}

/* Content (Right) - Section Per Viewport Scroll */
.content {
    flex: 1;
    height: 100vh;
    overflow-y: auto;
    scroll-behavior: smooth;
    scroll-snap-type: y mandatory;
    padding: 0 4rem;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

@media (max-width: 820px) {
    .content {
        height: auto;
        overflow-y: visible;
        scroll-snap-type: none;
        padding: 2rem 1.5rem;
    }
}

/* Full Screen Section */
.section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    padding: 3.5rem 0;
    box-sizing: border-box;
}

@media (max-width: 820px) {
    .section {
        min-height: auto;
        padding: 2.5rem 0;
        scroll-snap-align: none;
    }
}

.section h2 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    letter-spacing: -0.01em;
    color: var(--text-main);
}

.section h2 i {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.section-body p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.75;
}

.section-body p strong {
    color: var(--text-main);
}

/* Timeline (Experience) */
.timeline {
    position: relative;
    padding-left: 20px;
    margin-top: 0.75rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 4px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-bottom: 1.75rem;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -20px;
    top: 6px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--accent);
    border: 2px solid var(--bg-color);
}

.timeline-date {
    font-size: 0.8rem;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 0.3rem;
    font-family: 'JetBrains Mono', monospace;
}

.timeline-content h3 {
    font-size: 1.05rem;
    margin-bottom: 0.2rem;
    color: var(--text-main);
}

.timeline-company {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.timeline-text {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 0.4rem;
}

.timeline-list {
    list-style: none;
    margin-top: 0.3rem;
}

.timeline-list li {
    position: relative;
    padding-left: 1.1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.55;
    margin-bottom: 0.25rem;
}

.timeline-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--text-muted);
}

/* Projects */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.25rem;
}

.project-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

.project-card:hover {
    border-color: var(--accent);
    background-color: var(--card-hover);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.65rem;
}

.project-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.project-header h3 a {
    color: var(--text-main);
}

.project-header h3 a:hover {
    color: var(--accent);
}

.lang {
    font-size: 0.78rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.dot.rust { background-color: #dea584; }
.dot.js { background-color: #f1e05a; }
.dot.html { background-color: #e34c26; }

.project-desc {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

.project-desc strong {
    color: var(--text-main);
}

.project-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82rem;
    color: var(--text-muted);
    padding-top: 0.65rem;
    border-top: 1px solid var(--border-color);
}

.project-meta span i {
    margin-right: 0.25rem;
}

.project-links {
    display: flex;
    gap: 0.85rem;
}

.project-link {
    color: var(--text-muted);
}

.project-link:hover {
    color: var(--accent);
}

/* Skills Categories */
.skills-categories {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.skill-category h3 {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tag {
    background-color: var(--tag-bg);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.65rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    font-family: 'JetBrains Mono', monospace;
    transition: all 0.15s ease;
}

.tag:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.tag.highlight {
    border-color: var(--accent);
    color: var(--accent);
}

/* Education */
.education-block {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.25rem 1.5rem;
}

.edu-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

.edu-header h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-main);
}

.edu-date {
    font-size: 0.8rem;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}

.edu-sub {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.edu-desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* Interests */
.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.interest-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.15rem;
    display: flex;
    gap: 0.85rem;
    align-items: flex-start;
}

.interest-item i {
    font-size: 1.15rem;
    color: var(--accent);
    margin-top: 0.15rem;
    flex-shrink: 0;
}

.interest-item h4 {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.25rem;
}

.interest-item p {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.55;
}

/* Contact / The End */
.contact-block {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.5rem;
}

.contact-block p {
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.65;
    margin-bottom: 1.25rem;
}

.contact-action-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.5rem 0.95rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: all 0.15s ease;
}

.action-btn.primary {
    background-color: var(--text-main);
    color: var(--bg-color) !important;
    border-color: var(--text-main);
}

.action-btn.primary:hover {
    opacity: 0.9;
}

.action-btn.secondary {
    background-color: transparent;
    color: var(--text-main) !important;
}

.action-btn.secondary:hover {
    border-color: var(--accent);
    color: var(--accent) !important;
}

/* Footer */
.footer {
    text-align: center;
    padding-top: 2rem;
    padding-bottom: 1rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.8rem;
    opacity: 0.8;
}