:root {
    /* Editorial Warm Canvas Palette */
    --bg-color: #fbf9f5;        /* Warm paper tint */
    --card-bg: #ffffff;
    --text-main: #1c1917;       /* Rich stone charcoal */
    --text-muted: #78716c;      /* Warm stone gray */
    --accent: #2d5a27;          /* Rich academic sage/forest */
    --accent-light: #f0f4f1;
    --border: #e7e5e4;
    --radius: 10px;
    --shadow: 0 4px 16px -2px rgba(28, 25, 23, 0.05);

    /* Secondary Accent for A-Maze Demo */
    --accent-blue: #0284c7;
    --accent-blue-hover: #0369a1;

    /* Typography */
    --font-heading: 'Windsor', Georgia, serif;
    --font-body: 'Inter', -apple-system, sans-serif;
}

/* Dark Mode Variables */
body.dark-mode {
    --bg-color: #171513;        /* Warm dark espresso */
    --card-bg: #221f1d;
    --text-main: #f5f5f4;
    --text-muted: #a8a29e;
    --accent: #86efac;          /* Soft sage glow */
    --accent-light: #1c2b1e;
    --border: #332e2b;
    --shadow: 0 4px 16px -2px rgba(0, 0, 0, 0.4);

    /* Adjusted Blue for Dark Mode Contrast */
    --accent-blue: #38bdf8;
    --accent-blue-hover: #7dd3fc;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    padding: 2.5rem 1rem;
    transition: background-color 0.25s ease, color 0.25s ease;
}

/* Headings Upgrade */
h1, h2, h3, .project-card h3, .pub-card h3 {
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-main);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2.5rem;
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: 2rem;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    height: fit-content;
}

/* Locked Avatar Size */
.avatar {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 1rem auto;
    display: block;
    background-color: #cbd5e1;
}

.sidebar h1 {
    font-size: 1.35rem;
    font-weight: 700;
}

.sidebar .title {
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: 0.2rem;
}

.sidebar .institution {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
}

.social-links a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 0.6rem;
}

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

.theme-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 1.25rem;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.theme-btn:hover {
    background-color: var(--accent-light);
    color: var(--accent);
    border-color: var(--accent);
}

/* Main Content & Tabs */
.nav-tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid var(--border);
    margin-bottom: 2rem;
}

.tab-btn {
    background: none;
    border: none;
    padding: 0.75rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
}

.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* CV */
h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    margin-top: 1.5rem;
}

.cv-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    margin-bottom: 1.2rem;
}

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

.cv-item h3 {
    font-size: 1rem;
    font-weight: 600;
}

.cv-item .sub {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Publications */
.pub-card {
    background: var(--card-bg);
    padding: 1.2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.pub-card h3 {
    font-size: 1rem;
    margin: 0.4rem 0;
}

.pub-card .authors {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.pub-links {
    margin-top: 0.5rem;
}

.pub-links a {
    font-size: 0.8rem;
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

/* Projects Grid */
.section-desc {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
    margin-top: 1rem;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.project-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.8rem;
    gap: 0.5rem;
}

.status-badge {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    text-transform: uppercase;
}

.status-badge.active {
    background-color: var(--accent-light);
    color: var(--accent);
}

.project-tag {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
}

.project-card h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.project-desc {
    font-size: 0.85rem;
    margin-bottom: 1rem;
    flex-grow: 1;
}

.project-meta {
    border-top: 1px solid var(--border);
    padding-top: 0.8rem;
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* SPR Demo Styles */
.spr-demo-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.spr-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.spr-badge {
    background-color: var(--accent-light);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    text-transform: uppercase;
}

.spr-subtitle, .spr-instructions {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

kbd {
    background: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.1rem 0.4rem;
    font-family: monospace;
    font-size: 0.75rem;
    color: var(--text-main);
}

.spr-display {
    background-color: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    min-height: 80px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1rem;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.15rem;
    line-height: 2;
}

.spr-word-mask {
    color: var(--text-muted);
    letter-spacing: 1px;
    transition: color 0.15s ease;
}

.spr-word-mask.active-word {
    color: var(--accent);
    font-weight: 700;
    background-color: var(--accent-light);
    padding: 0.1rem 0.3rem;
    border-radius: 4px;
}

.spr-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.spr-timer {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: monospace;
}

.spr-timer strong {
    color: var(--accent);
}

/* SPR Button (High Contrast Fix) */
.spr-btn {
    background-color: var(--accent);
    color: var(--card-bg); /* Automatically flips for high contrast in dark/light mode */
    border: none;
    padding: 0.55rem 1.1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: opacity 0.2s ease, transform 0.15s ease;
}

.spr-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.spr-btn kbd {
    background: rgba(0, 0, 0, 0.15);
    color: var(--card-bg);
    border: none;
}

body:not(.dark-mode) .spr-btn kbd {
    background: rgba(255, 255, 255, 0.25);
    color: #ffffff;
}

/* Interactive A-Maze Task Styling */
.maze-demo-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent-blue);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.maze-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.maze-badge {
    background-color: rgba(2, 132, 199, 0.12);
    color: var(--accent-blue);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    text-transform: uppercase;
}

.maze-subtitle, .maze-instructions {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.maze-display {
    background-color: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.maze-word-btn {
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    min-width: 140px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    transition: all 0.15s ease;
}

.maze-word-btn:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.maze-word-btn .key-hint {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
}

.maze-word-btn .word-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

.maze-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.maze-timer {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: monospace;
}

.maze-timer strong {
    color: var(--accent-blue);
}

.maze-reset-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
}

.maze-reset-btn:hover {
    background-color: var(--accent-light);
}

/* Start Task Button (High Contrast Fix) */
.maze-start-btn {
    background-color: var(--accent-blue);
    color: #ffffff;
    border: none;
    padding: 0.75rem 1.75rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: background-color 0.15s ease, transform 0.15s ease;
}

body.dark-mode .maze-start-btn {
    color: #0f172a; /* Dark text for light cyan button in dark mode */
}

.maze-start-btn:hover {
    background-color: var(--accent-blue-hover);
    transform: translateY(-1px);
}

/* Hero Section / Typewriter Palette Integration */
.hero {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2.5rem 1.5rem;
    text-align: center;
    background: transparent;
}

.hero-tag {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent); /* Matches theme */
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: clamp(1.75rem, 4.2vw, 3rem);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 1.5rem;
    min-height: 140px;
}

.static-text {
    display: block;
    margin-bottom: 0.5rem;
}

.typed-text {
    color: var(--accent); /* Integrates seamlessly into palette */
    border-bottom: 2px solid var(--accent);
}

.typed-cursor {
    color: var(--accent);
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }
    .sidebar {
        position: relative;
        top: 0;
    }
}

/* Scroll reveal animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.active {
    opacity: 1;
    transform: translateY(0);
}