@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Merriweather:ital,wght@0,300;0,400;0,700;1,300;1,400&display=swap');

:root {
    --font-sans: 'Inter', sans-serif;
    --font-serif: 'Merriweather', serif;
    --color-text-primary: #111;
    --color-text-secondary: #555;
    --color-text-tertiary: #777;
    --color-bg: #fff;
    --color-surface: #fff;
    --color-surface-soft: #f5f5f5;
    --color-surface-muted: #f9fafb;
    --color-border: #e5e7eb;
    --color-border-strong: #d1d5db;
    --color-hover-bg: rgba(0, 0, 0, 0.03);
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-modal-backdrop: rgba(0, 0, 0, 0.4);
    --color-accent-bg: #eef4ff;
    --color-accent-text: #2563eb;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --sidebar-width: 280px;
    --spacing-unit: 1.5rem;
    color-scheme: light;
}

:root[data-theme="dark"] {
    --color-text-primary: #f4f0ea;
    --color-text-secondary: #c9c2b7;
    --color-text-tertiary: #9b948c;
    --color-bg: #12110f;
    --color-surface: #171512;
    --color-surface-soft: #211f1b;
    --color-surface-muted: #1b1916;
    --color-border: #34302a;
    --color-border-strong: #4a443b;
    --color-hover-bg: rgba(255, 255, 255, 0.055);
    --color-shadow: rgba(0, 0, 0, 0.38);
    --color-modal-backdrop: rgba(0, 0, 0, 0.7);
    --color-accent-bg: #1e2b44;
    --color-accent-text: #8ab4ff;
    --color-success: #34d399;
    --color-warning: #fbbf24;
    color-scheme: dark;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    display: flex;
    min-height: 100vh;
    text-transform: lowercase;
    transition: background-color 0.2s ease, color 0.2s ease;
}

/* Layout */
.container {
    display: flex;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

    /* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    padding: calc(var(--spacing-unit) * 2);
    position: fixed;
    height: 100vh;
    display: flex;
    flex-direction: column;
    border-right: 1px solid transparent; /* Optional divider */
    text-transform: lowercase; /* Force lowercase in sidebar */
}

/* Force lowercase globally except where specifically overridden if needed */
body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    display: flex;
    min-height: 100vh;
    text-transform: lowercase;
}

.profile-header {
    margin-bottom: 2rem;
}

.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    overflow: hidden;
    background: none;
    border: none;
}

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

.profile-name {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    text-transform: lowercase;
}

.profile-title {
    font-size: 0.9rem;
    color: var(--color-text-tertiary);
}

.nav-menu {
    list-style: none;
    flex-grow: 1;
}

.nav-item {
    margin-bottom: 0.5rem;
}

.nav-link {
    display: block;
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--color-text-secondary);
    border-radius: 6px;
    transition: background-color 0.2s, color 0.2s;
    font-size: 0.95rem;
}

.nav-link:hover, .nav-link.active {
    background-color: var(--color-surface-soft);
    color: var(--color-text-primary);
    font-weight: 500;
}

.theme-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-top: 1rem;
    padding: 0.55rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    text-transform: lowercase;
    transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}

.theme-toggle:hover {
    background: var(--color-surface-soft);
    border-color: var(--color-border-strong);
    color: var(--color-text-primary);
}

.theme-toggle i {
    color: var(--color-accent-text);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: auto;
    padding-top: 1rem;
}

.theme-toggle + .social-links {
    margin-top: 1rem;
}

.social-link {
    color: var(--color-text-tertiary);
    text-decoration: none;
    font-size: 1.2rem;
}

.copyright {
    margin-top: 1rem;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

.mobile-nav-toggle {
    display: none;
}

.mobile-nav-toggle-bars {
    display: grid;
    gap: 4px;
    width: 1.05rem;
}

.mobile-nav-toggle-bars span {
    background: currentColor;
    border-radius: 999px;
    display: block;
    height: 2px;
    transform-origin: center;
    transition: opacity 0.16s ease, transform 0.16s ease;
    width: 100%;
}

.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle-bars span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle-bars span:nth-child(2) {
    opacity: 0;
}

.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle-bars span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    padding: calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 4);
    width: calc(100% - var(--sidebar-width));
    max-width: 900px;
}

section {
    margin-bottom: 4rem;
}

h2 {
    font-family: var(--font-serif);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--color-text-primary);
    font-weight: 700;
    text-transform: lowercase;
}

p {
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
    font-size: 1.05rem;
}

/* Tags */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.tag {
    background-color: var(--color-accent-bg);
    color: var(--color-accent-text);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* Timeline / Experience */
.timeline {
    position: relative;
    padding-left: 1.5rem;
    border-left: 2px solid var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -1.95rem; /* Adjust based on border width */
    top: 0.3rem;
    width: 0.75rem;
    height: 0.75rem;
    background-color: var(--color-bg);
    border: 2px solid var(--color-border-strong); /* Grey border for inactive/past */
    border-radius: 50%;
}

.timeline-item.active::before {
    animation: pulseDot 2s infinite;
    background-color: #22c55e;
    border-color: #22c55e;
}

.timeline-item.upcoming::before {
    background-color: #3b82f6;
    border-color: #3b82f6;
}

.timeline-item.upcoming .countdown {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    font-style: italic;
    margin-top: 0.25rem;
    margin-bottom: 0.5rem;
}

@keyframes pulseDot {
    0%, 100% { 
        opacity: 1; 
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7);
    }
    50% { 
        opacity: 0.8; 
        transform: scale(1.2);
        box-shadow: 0 0 0 6px rgba(34, 197, 94, 0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}

.role {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--color-text-primary);
    text-transform: lowercase;
}

.date {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
}

.company {
    font-style: italic;
    color: var(--color-text-secondary);
    margin-bottom: 0.75rem;
    display: block;
    font-size: 0.95rem;
}

.timeline-content ul {
    list-style-position: outside;
    padding-left: 1.2rem;
    margin-top: 0.5rem;
}

.timeline-content li {
    margin-bottom: 0.5rem;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* Projects / Lists */
.project-list {
    list-style: none;
}

.project-item {
    margin-bottom: 1.5rem;
    position: relative; /* For positioning tooltips if needed */
    padding: 1rem;
    margin-left: -1rem;
    margin-right: -1rem;
    border-radius: 12px;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1); /* Sleek Apple-like spring easing */
    border: 1px solid transparent;
}

.project-item:hover {
    background-color: var(--color-hover-bg); /* Very subtle darkening */
    transform: scale(1.02); /* Gentle scale up */
    box-shadow: 0 10px 30px -10px var(--color-shadow); /* Soft diffused shadow */
    /* border-color: rgba(0, 0, 0, 0.02); Optional border */
}

.project-item a {
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
    position: relative;
    z-index: 2; /* Ensure link stays above other elements on hover */
}

.project-item a:hover {
    border-bottom-color: var(--color-text-primary);
}

.project-desc {
    color: var(--color-text-secondary);
    margin-top: 0.25rem;
    font-size: 0.95rem;
}

.paper-citations {
    color: var(--color-text-tertiary);
    font-size: 0.78rem;
    margin-top: 0.35rem;
}

.paper-citations span {
    color: var(--color-text-primary);
    font-family: var(--font-serif);
    font-size: 0.95rem;
    font-weight: 700;
    margin-right: 0.18rem;
}

/* Paper Status Badges with Hover Effect */
.paper-status {
    display: inline-block;
    margin-left: 0.5rem;
    padding: 0.1rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    color: #fff;
    background-color: var(--color-text-secondary);
    opacity: 0;
    transform: translateY(5px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    pointer-events: none; /* Allow clicking through to link if overlap */
    position: absolute;
    top: -1.2rem; /* Adjust position to be above */
    left: 0;
    white-space: nowrap;
    z-index: 10;
    box-shadow: 0 2px 5px var(--color-shadow);
}

.paper-status::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 10px;
    border-width: 4px 4px 0;
    border-style: solid;
    border-color: var(--color-text-secondary) transparent transparent transparent;
}

.project-item:hover .paper-status {
    opacity: 1;
    transform: translateY(0);
}

/* Status specific colors */
.status-accepted {
    background-color: var(--color-success); /* Green */
}
.status-accepted::after {
    border-color: var(--color-success) transparent transparent transparent;
}

.status-under-review {
    background-color: var(--color-warning); /* Amber/Orange */
}
.status-under-review::after {
    border-color: var(--color-warning) transparent transparent transparent;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        border-right: none;
        height: auto;
        padding: 0.85rem 1rem;
        position: sticky;
        top: 0;
        width: 100%;
        z-index: 60;
    }

    .profile-header {
        align-items: center;
        column-gap: 0.75rem;
        display: grid;
        grid-template-columns: auto minmax(0, 1fr) auto;
        margin-bottom: 0;
    }

    .avatar {
        grid-row: 1 / span 2;
        height: 44px;
        margin-bottom: 0;
        width: 44px;
    }

    .profile-name {
        font-size: 1.05rem;
        line-height: 1.2;
        margin-bottom: 0;
    }

    .profile-title {
        font-size: 0.78rem;
    }

    .mobile-nav-toggle {
        align-items: center;
        align-self: center;
        background: var(--color-surface);
        border: 1px solid var(--color-border);
        border-radius: 8px;
        color: var(--color-text-primary);
        cursor: pointer;
        display: inline-flex;
        grid-column: 3;
        grid-row: 1 / span 2;
        height: 2.35rem;
        justify-content: center;
        padding: 0;
        width: 2.35rem;
    }

    .sidebar:not(.is-mobile-open) .nav-menu,
    .sidebar:not(.is-mobile-open) .theme-toggle,
    .sidebar:not(.is-mobile-open) .social-links,
    .sidebar:not(.is-mobile-open) .copyright {
        display: none;
    }

    .sidebar.is-mobile-open .nav-menu {
        display: flex;
        flex-direction: column;
        flex-grow: 0;
        gap: 0.35rem;
        margin-top: 1rem;
    }

    .sidebar.is-mobile-open .nav-item {
        margin-bottom: 0;
    }

    .sidebar.is-mobile-open .nav-link {
        padding: 0.65rem 0.75rem;
    }

    .sidebar.is-mobile-open .theme-toggle {
        margin-top: 1rem;
    }

    .sidebar.is-mobile-open .social-links {
        margin-top: 1rem;
        padding-top: 0.75rem;
    }

    .sidebar.is-mobile-open .copyright {
        display: block;
        margin-top: 0.75rem;
    }

    .main-content {
        margin-left: 0;
        max-width: none;
        min-width: 0;
        overflow-wrap: anywhere;
        width: 100%;
        padding: 1.5rem;
    }

    section,
    p,
    .tags,
    .tag,
    .project-item,
    .project-desc {
        max-width: 100%;
    }

    p,
    .project-desc {
        overflow-wrap: anywhere;
    }
    
    .timeline-header {
        flex-direction: column;
    }
}

/* Modal Styles */
.modal {
    display: none; 
    position: fixed; 
    z-index: 100; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: var(--color-modal-backdrop); 
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--color-bg);
    margin: 10% auto; 
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 15px 40px var(--color-shadow);
    width: 90%;
    max-width: 500px;
    position: relative;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {transform: translateY(-20px); opacity: 0;}
    to {transform: translateY(0); opacity: 1;}
}

.close-button {
    color: var(--color-text-tertiary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.2s;
}

.close-button:hover,
.close-button:focus {
    color: var(--color-text-primary);
    text-decoration: none;
}

.portfolio-list {
    list-style: none;
    margin-top: 1.5rem;
}

.portfolio-list li {
    margin-bottom: 0.75rem;
    text-align: center;
}

.portfolio-list a {
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
    font-size: 1.1rem;
}

.portfolio-list a:hover {
    border-bottom-color: var(--color-text-primary);
    color: var(--color-accent-text);
}

.experience-duration {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    margin-top: 0.25rem;
    margin-bottom: 0.5rem;
    font-style: italic;
}

:root[data-theme="dark"] .hljs {
    background: var(--color-surface-muted);
    color: var(--color-text-primary);
}

:root[data-theme="dark"] .hljs-comment,
:root[data-theme="dark"] .hljs-quote {
    color: var(--color-text-tertiary);
}

:root[data-theme="dark"] .hljs-keyword,
:root[data-theme="dark"] .hljs-selector-tag,
:root[data-theme="dark"] .hljs-built_in {
    color: #8ab4ff;
}

:root[data-theme="dark"] .hljs-string,
:root[data-theme="dark"] .hljs-title,
:root[data-theme="dark"] .hljs-name {
    color: #a7d28d;
}

:root[data-theme="dark"] .hljs-number,
:root[data-theme="dark"] .hljs-literal {
    color: #f6c177;
}