:root {
    /* Dark-mode minimal palette: bright light text for better contrast and readability */
    --bg: #1a2028;            /* slightly lighter dark grey (avoids blue tones) */
    --primary-text: #f0f4f7;  /* bright light grey for readability */
    --secondary-text: #c5d3db;/* brighter muted grey for secondary text */
    --accent: #3b82f6;       /* vibrant, highly saturated blue for links */
    --border: #2d3a47;       /* lighter border for visibility on new bg */
    --link-hover: #2563eb;   /* slightly darker blue for hover */
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-weight: 400;
    line-height: 1.6;
    color: var(--primary-text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

.layout {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 30px;
    padding: 80px 40px 120px;
    align-items: flex-start;
}

/* Left Column - Fixed Width and Sticky */
.sidebar {
    width: 380px;
    flex-shrink: 0;
    position: sticky;
    top: 80px;
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
}

.avatar {
    /* Square avatar with light grey border */
    width: 350px;
    height: 350px;
    margin-bottom: 30px;
    border: 2px solid var(--border);
    display: block; /* avoid inline-gap and subpixel shifts */
}

h1 {
    font-family: 'Crimson Pro', serif;
    font-size: 2em;
    font-weight: 600;
    margin-bottom: 0.3em;
    color: var(--primary-text);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.title {
    font-size: 0.95em;
    color: var(--secondary-text);
    margin-bottom: 1.5em;
    font-weight: 300;
    line-height: 1.6;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 30px;
}

.contact-links a {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9em;
    transition: color 0.2s ease;
    display: block;
}

.contact-links a:hover {
    color: var(--link-hover);
}

/* Sidebar divider and nav links under the CV */
.sidebar-divider {
    height: 1px;
    background: var(--border);
    margin: 18px 0;
    border-radius: 1px;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-nav-title {
    color: var(--secondary-text);
    font-size: 1.2em;
    margin: 6px 0 6px;
    font-weight: 300;
}

.sidebar-nav a {
    /* Match the Download CV / contact link styles for consistency */
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9em;
    transition: color 0.2s ease;
    display: block;
}

.sidebar-nav a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* Right Column - Fixed Width */
.main-content {
    max-width: 700px;
    flex: 1;
    opacity: 0;
    animation: fadeIn 0.8s ease 0.3s forwards;
}

/* Typography */
h2 {
    font-family: inherit;
    font-size: 1.6em;
    font-weight: 600;
    margin: 40px 0 20px;
    color: #ff9500;
    letter-spacing: 0;
}

h2:first-child {
    margin-top: 0;
}

h3 {
    font-family: inherit;
    font-size: 1.2em;
    font-weight: 600;
    margin: 20px 0 12px;
    color: var(--primary-text);
}

p {
    margin-bottom: 1em;
    font-size: 1em;
    line-height: 1.6;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Bio Section */
.bio {
    margin-bottom: 40px;
}

.bio strong {
    font-weight: 500;
    color: var(--primary-text);
}

/* News/Updates Section */
.news-list {
    list-style: none;
}

.news-item {
    margin-bottom: 24px;
    line-height: 1.7;
}

.news-item strong {
    font-weight: 500;
    color: var(--primary-text);
}

/* Project Section */
.project-item {
    margin-bottom: 50px;
}

.project-item h3 {
    margin: 0 0 8px 0;
    font-size: 1.25em;
}

.project-meta {
    color: var(--secondary-text);
    font-size: 0.95em;
    margin-bottom: 12px;
    font-style: italic;
}

.project-description {
    margin-bottom: 12px;
    position: relative;
    padding-left: 1.5em;
}

.project-description::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent);
}

.project-description-list {
    list-style: none;
    margin: 8px 0;
    padding: 0;
}

.project-description-list li {
    margin-bottom: 4px;
    position: relative;
    padding-left: 1.3em;
    font-size: 0.95em;
    line-height: 1.4;
}

.project-description-list li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent);
}

.report-link {
    color: var(--accent);
    text-decoration: none;
    cursor: pointer;
    transition: color 0.2s ease;
    font-weight: 400;
}

.report-link:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* Simulation Reports Section */
.simulation-list {
    list-style: none;
}

.simulation-item {
    margin-bottom: 28px;
}

.simulation-item h3 {
    margin: 0 0 6px 0;
    font-size: 1.15em;
    font-weight: 500;
}

.simulation-item h3 .report-link {
    font-size: 1em;
    font-weight: 500;
}

.simulation-item p {
    margin: 8px 0 0 0;
    font-size: 0.98em;
    color: var(--secondary-text);
}

/* PDF Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    position: relative;
    width: 90%;
    height: 90%;
    margin: auto;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    background: var(--accent);
    color: white;
}

.modal-header h3 {
    margin: 0;
    color: white;
    font-size: 1.3em;
}

.close-modal {
    background: none;
    border: none;
    color: white;
    font-size: 2em;
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.2s ease;
}

.close-modal:hover {
    opacity: 0.7;
}

.pdf-viewer {
    width: 100%;
    height: calc(100% - 80px);
    border: none;
}

/* Footer */
footer {
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
    color: var(--secondary-text);
    font-size: 0.9em;
}

/* Animations */
@keyframes fadeIn {
    /* Reduce to opacity-only animation to avoid GPU compositing which can cause colour artefacts */
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Responsive */
@media (max-width: 900px) {
    .layout {
        flex-direction: column;
        gap: 40px;
        padding: 60px 30px 80px;
    }

    .sidebar {
        width: 100%;
        position: relative;
        top: 0;
    }

    .avatar {
        /* Tablet / small-desktop: slightly smaller to fit the narrower sidebar */
        width: 280px;
        height: 280px;
        border: 2px solid var(--border);
    }

    h1 {
        font-size: 1.8em;
    }

    .contact-links {
        margin-top: 20px;
    }

    .main-content {
        max-width: 100%;
    }
}

@media (max-width: 600px) {
    .layout {
        padding: 40px 24px 60px;
        gap: 30px;
    }

    .sidebar {
        width: 100%;
        position: relative;
        top: 0;
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .avatar {
        /* Mobile: nearly full width, centered */
        width: 85vw;
        max-width: 340px;
        height: auto;
        aspect-ratio: 1 / 1;
        border: 2px solid var(--border);
    }

    h1 {
        font-size: 1.6em;
    }

    h2 {
        font-size: 1.4em;
        margin: 40px 0 20px;
    }

    .modal-content {
        width: 95%;
        height: 95%;
    }
}