:root {
    --color-bg-default: #0d1117;
    --color-bg-subtle: #161b22;
    --color-bg-overlay: #21262d;
    --color-border-default: #30363d;
    --color-border-muted: #21262d;

    --color-text-primary: #c9d1d9;
    --color-text-secondary: #8b949e;
    --color-text-link: #58a6ff;

    --color-btn-bg: #21262d;
    --color-btn-hover: #30363d;
    --color-btn-text: #c9d1d9;
    --color-btn-border: #363b42;

    --color-accent-fg: #58a6ff;
    --color-success-fg: #3fb950;

    --font-family-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --font-family-mono: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
}

[data-theme="light"] {
    --color-bg-default: #ffffff;
    --color-bg-subtle: #f6f8fa;
    --color-bg-overlay: #ffffff;
    --color-border-default: #d0d7de;
    --color-border-muted: #d8dee4;

    --color-text-primary: #24292f;
    --color-text-secondary: #57606a;
    --color-text-link: #0969da;

    --color-btn-bg: #f6f8fa;
    --color-btn-hover: #f3f4f6;
    --color-btn-text: #24292f;
    --color-btn-border: #d0d7de;

    --color-accent-fg: #0969da;
    --color-success-fg: #1a7f37;
}

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

body {
    font-family: var(--font-family-sans);
    background-color: var(--color-bg-default);
    color: var(--color-text-primary);
    line-height: 1.5;
    font-size: 14px;
}

a {
    color: var(--color-text-link);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

ul {
    list-style: none;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 16px;
    /* Reduced padding for mobile first */
}

/* Header */
.site-header {
    background-color: var(--color-bg-subtle);
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border-default);
    margin-bottom: 32px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 32px;
    color: var(--color-text-primary);
    text-decoration: none;
}

.logo-text {
    font-size: 16px;
    font-weight: 600;
}

.main-nav ul {
    display: none;
    /* Hidden on mobile by default */
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.icon-btn {
    background: none;
    border: 1px solid var(--color-border-default);
    padding: 4px 8px;
    border-radius: 6px;
    color: var(--color-text-primary);
    cursor: pointer;
}

.avatar-small img {
    border-radius: 50%;
    width: 20px;
    height: 20px;
    border: 1px solid var(--color-border-default);
}

/* Main Layout */
.main-content {
    display: flex;
    flex-direction: column;
    /* Stack on mobile */
    gap: 24px;
}

/* Sidebar */
.profile-sidebar {
    width: 100%;
    /* Full width on mobile */
}

.profile-avatar-large img {
    width: 100%;
    max-width: 296px;
    border-radius: 50%;
    border: 1px solid var(--color-border-default);
    margin-bottom: 16px;
}

.vcard-names {
    margin-bottom: 16px;
}

.vcard-names .p-name {
    display: block;
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text-primary);
}

.vcard-names .p-nickname {
    display: block;
    font-size: 20px;
    font-weight: 300;
    color: var(--color-text-secondary);
}

.user-profile-bio {
    font-size: 16px;
    margin-bottom: 16px;
}

.btn {
    display: inline-block;
    padding: 5px 16px;
    font-size: 14px;
    font-weight: 500;
    line-height: 20px;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid var(--color-btn-border);
    border-radius: 6px;
    background-color: var(--color-btn-bg);
    color: var(--color-btn-text);
    text-align: center;
    transition: .2s cubic-bezier(0.3, 0, 0.5, 1);
    transition-property: color, background-color, border-color;
}

.btn:hover {
    background-color: var(--color-btn-hover);
    text-decoration: none;
}

.btn-block {
    display: block;
    width: 100%;
    margin-bottom: 16px;
}

.profile-details {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 14px;
    color: var(--color-text-primary);
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.detail-item i {
    color: var(--color-text-secondary);
    width: 16px;
    text-align: center;
}

/* Content Area */
.content-area {
    width: 100%;
}

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

.pinned-items-header h2 {
    font-size: 16px;
    font-weight: 400;
    color: var(--color-text-primary);
}

.customize-link {
    font-size: 12px;
}

.pinned-grid {
    display: grid;
    grid-template-columns: 1fr;
    /* Single column mobile */
    gap: 16px;
    margin-bottom: 32px;
}

.pinned-item-card {
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
    padding: 16px;
    background-color: var(--color-bg-default);
    display: flex;
    flex-direction: column;
}

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

.repo-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}

.repo-title i {
    color: var(--color-text-secondary);
}

.badge {
    border: 1px solid var(--color-border-default);
    border-radius: 2em;
    padding: 0 7px;
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.grab-handle {
    color: var(--color-text-secondary);
    cursor: grab;
}

.repo-desc {
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    flex-grow: 1;
}

.card-footer {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--color-text-secondary);
}

.lang-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
}

.star-count i {
    margin-right: 4px;
}


/* Github Stats Title */
.github-stats-section h2 {
    font-size: 16px;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 16px;
}

.contribution-graph-container {
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
    padding: 24px;
    background-color: var(--color-bg-default);
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 16px;
}

.contribution-graph-container img {
    height: auto;
}

.gh-chart {
    flex: 1 1 600px;
    min-width: 300px;
    max-width: 100%;
}

.gh-streak {
    flex: 0 1 auto;
    max-width: 100%;
}

/* .streak-section h2 removed as merged */

.stats-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
    /* Center them on mobile/desktop */
}

.stats-grid img {
    height: auto;
    max-width: 100%;
    border-radius: 6px;
    border: 1px solid var(--color-border-default);
}

.gh-stats-card,
.gh-streak-card {
    flex: 1 1 400px;
    /* Allow them to grow but wrap if needed */
    min-width: 300px;
}

/* Footer */
.site-footer {
    margin-top: 48px;
    padding-top: 40px;
    padding-bottom: 40px;
    border-top: 1px solid var(--color-border-default);
    display: flex;
    flex-direction: column;
    /* Stack on mobile */
    align-items: center;
    gap: 16px;
}

.footer-logo {
    color: var(--color-text-secondary);
}

.footer-links {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--color-text-secondary);
}

.footer-links ul {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}



/* Responsive - Tablet and Desktop */
@media (min-width: 768px) {
    .container {
        padding: 0 32px;
    }

    .main-content {
        flex-direction: row;
        gap: 32px;
    }

    .profile-sidebar {
        width: 25%;
        min-width: 256px;
        margin-top: -32px;
        /* Pull up profile pic overlap inspired */
        position: sticky;
        top: 24px;
        height: fit-content;
    }

    .profile-avatar-large img {
        margin-top: 0;
        z-index: 10;
        position: relative;
    }

    .content-area {
        width: 75%;
    }

    .pinned-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .main-nav ul {
        display: flex;
        gap: 16px;
    }

    .main-nav ul li a {
        color: var(--color-text-primary);
        font-weight: 600;
        padding: 8px 1px;
    }

    .main-nav ul li a.active {
        border-bottom: 2px solid var(--color-accent-fg);
    }

    .site-footer {
        flex-direction: row;
        justify-content: center;
        gap: 24px;
    }

    .readme-content {
        padding: 32px;
    }
}

/* README Section */
.readme-section {
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
    margin-bottom: 32px;
    background-color: var(--color-bg-default);
}

.readme-header {
    padding: 8px 16px;
    background-color: var(--color-bg-subtle);
    border-bottom: 1px solid var(--color-border-default);
    border-top-left-radius: 6px;
    border-top-right-radius: 6px;
    font-size: 14px;
    font-family: var(--font-family-mono);
}

.readme-header .user-id {
    color: var(--color-text-primary);
}

.readme-header .repo-name {
    font-weight: 600;
}

.readme-content {
    padding: 5px;
}

.readme-content h3 {
    border-bottom: 1px solid var(--color-border-muted);
    padding-bottom: 8px;
    margin-bottom: 16px;
    font-size: 24px;
    font-weight: 600;
}

.readme-content h4 {
    margin-top: 24px;
    margin-bottom: 16px;
    font-size: 20px;
    font-weight: 600;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
    /* Offset for fixed header */
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-item {
    background-color: var(--color-bg-subtle);
    border: 1px solid var(--color-border-default);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.skill-item i {
    color: var(--color-text-secondary);
}

/* Ensure images in readme are responsive */
.readme-content img {
    max-width: 100%;
    height: auto;
}

/* Skills Grid Redesign */
.skills-grid-new {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.skill-card {
    background-color: var(--color-bg-subtle);
    border: 1px solid var(--color-border-default);
    border-radius: 8px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: transform 0.2s, border-color 0.2s;
}

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

.skill-icon {
    font-size: 32px;
    margin-bottom: 8px;
}

.skill-card .skill-name {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-text-primary);
}

.skill-card .star-rating {
    font-size: 12px;
}

/* Experience Timeline Redesign */
.experience-timeline {
    position: relative;
    padding-left: 30px;
    margin-bottom: 32px;
}

/* The vertical line */
.experience-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border-default);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 32px;
    padding: 20px;
    background-color: var(--color-bg-subtle);
    border: 1px solid var(--color-border-default);
    border-radius: 8px;
    transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.timeline-item:hover {
    transform: translateX(4px);
    border-color: var(--color-accent-fg);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* The dot on the timeline */
.timeline-marker {
    position: absolute;
    left: -36px;
    /* Adjust to center on the line (30px padding + 6px to center of 12px dot) */
    top: 24px;
    /* Align with the top specific to the card padding */
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background-color: var(--color-bg-default);
    border: 3px solid var(--color-accent-fg);
    z-index: 1;
    transition: transform 0.2s;
}

.timeline-item:hover .timeline-marker {
    transform: scale(1.2);
    background-color: var(--color-accent-fg);
}

.timeline-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.job-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.job-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: var(--color-text-secondary);
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border-muted);
    margin-bottom: 12px;
}

.job-meta .company {
    font-weight: 600;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.job-meta .company i {
    color: var(--color-text-secondary);
}

.job-meta .duration {
    background-color: var(--color-bg-default);
    padding: 2px 8px;
    border-radius: 12px;
    border: 1px solid var(--color-border-muted);
    font-size: 12px;
}

.job-achievements {
    list-style: none;
    padding: 0;
    margin: 0;
    color: var(--color-text-primary);
    font-size: 15px;
    line-height: 1.6;
}

.job-achievements li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
}

.job-achievements li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-accent-fg);
}

.job-achievements li:last-child {
    margin-bottom: 0;
}

.job-technologies {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.tech-tag {
    background-color: var(--color-bg-default);
    border: 1px solid var(--color-border-muted);
    border-radius: 12px;
    padding: 2px 10px;
    font-size: 12px;
    color: var(--color-accent-fg);
    font-weight: 500;
}

/* Research Section */
.research-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.research-card {
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
    padding: 16px;
    background-color: var(--color-bg-subtle);
}


.paper-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}

.paper-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 0;
    /* Removing bottom margin as it's handled by header */
}

.paper-year {
    font-size: 12px;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-default);
    padding: 2px 6px;
    border-radius: 12px;
    background-color: var(--color-bg-default);
}

.paper-publication {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    font-style: italic;
}

.paper-title a {
    color: var(--color-accent-fg);
}

.paper-abstract {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-bottom: 12px;
}

.paper-highlights {
    list-style: none;
    padding: 0;
    margin: 0 0 16px 0;
    color: var(--color-text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

.paper-highlights li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
}

.paper-highlights li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-accent-fg);
}

.paper-highlights li:last-child {
    margin-bottom: 0;
}

.paper-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.paper-tags .tag {
    font-size: 12px;
    color: var(--color-text-primary);
    background-color: var(--color-bg-default);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid var(--color-border-muted);
}

.paper-actions {
    display: flex;
    gap: 16px;
    align-items: center;
}

.view-paper-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--color-accent-fg);
    font-weight: 500;
    transition: color 0.2s;
}

.view-paper-btn:hover {
    text-decoration: underline;
}

/* Featured Projects Section */
.project-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.project-card {
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
    padding: 16px;
    background-color: var(--color-bg-subtle);
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: transform 0.2s, border-color 0.2s;
}

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

.project-image {
    width: 100%;
    height: auto;
    border-radius: 4px;
    margin-bottom: 16px;
    object-fit: cover;
    aspect-ratio: 16/9;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.project-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 0;
}

.project-title a {
    color: var(--color-accent-fg);
}

.project-links {
    display: flex;
    gap: 12px;
}

.project-links a {
    color: var(--color-text-secondary);
    font-size: 16px;
    transition: color 0.2s;
}

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

.project-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-bottom: 16px;
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
}

.project-tags .tag {
    font-size: 12px;
    color: var(--color-text-primary);
    background-color: var(--color-bg-default);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid var(--color-border-muted);
}

.github-stats-section {
    margin-top: 32px;
    scroll-margin-top: 100px;
}

.section-title {
    margin-top: 32px;
    margin-bottom: 16px;
    font-size: 20px;
    font-weight: 600;
    border-bottom: 1px solid var(--color-border-muted);
    padding-bottom: 8px;
}

/* Mobile Optimization for Timeline */
@media (max-width: 767px) {
    .experience-timeline {
        padding-left: 0;
    }

    .experience-timeline::before {
        display: none;
    }

    .timeline-marker {
        display: none;
    }

    .job-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    display: none;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--color-accent-fg);
    color: #ffffff;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s, background-color 0.2s;
    border: none;
    font-size: 18px;
}

.back-to-top:hover {
    transform: translateY(-2px);
    background-color: var(--color-text-link);
}

/* Sticky Contact Sidebar */
.sticky-contact-sidebar {
    position: fixed;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 1000;
    padding-right: 10px;
}

.contact-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    color: #ffffff;
    font-size: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, width 0.2s;
    text-decoration: none;
}

.contact-btn:hover {
    transform: scale(1.1);
}

.call-btn {
    background-color: #0969da;
    /* Blue */
}

.whatsapp-btn {
    background-color: #25D366;
    /* WhatsApp Green */
}