:root {
    --bg-base: #0a0a0c;
    --bg-card: rgba(22, 22, 26, 0.6);
    --text-primary: #e2e2e8;
    --text-secondary: #a0a0ab;
    --accent: #7b61ff;
    --accent-hover: #9b87ff;
    --border: rgba(255, 255, 255, 0.08);
    
    /* Lacunaria: The padding, the space, the soft edges */
    --lacuna-padding: 2.5rem;
    --lacuna-radius: 16px;
    --lacuna-curve: cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Ambient Background Glow */
.background-ambient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: 
        radial-gradient(circle at 15% 50%, rgba(123, 97, 255, 0.08), transparent 40%),
        radial-gradient(circle at 85% 30%, rgba(97, 255, 216, 0.05), transparent 40%);
    z-index: -1;
    pointer-events: none;
}

/* Layout */
.site-header {
    padding: 4rem 2rem 2rem;
    text-align: center;
}

.header-content h1 {
    font-family: 'Playfair Display', serif;
    font-size: 3.5rem;
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
}

.main-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.nav-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid transparent;
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s var(--lacuna-curve);
}

.nav-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-btn.active {
    color: var(--bg-base);
    background: var(--text-primary);
}

.content-container {
    flex: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

.view {
    display: none;
    animation: fadeIn 0.5s var(--lacuna-curve);
}

.view.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Lacunaria Card Style - The gentle embrace */
.card.lacunaria {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--lacuna-radius);
    padding: var(--lacuna-padding);
    margin-bottom: 2rem;
}

.card h2 {
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
}

/* Dictionary & Math Entries */
.entry {
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--border);
}

.entry:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.entry h3 {
    font-family: 'Playfair Display', serif;
    color: var(--accent);
    font-size: 1.6rem;
    margin-bottom: 0.5rem;
}

.entry-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-family: 'JetBrains Mono', monospace;
}

.entry-body {
    color: var(--text-primary);
    line-height: 1.7;
}

/* Markdown specific styling inside entries */
.entry-body p { margin-bottom: 1rem; }
.entry-body strong { color: #fff; font-weight: 600; }
.entry-body em { color: var(--text-secondary); }

/* Quick Links (Home) */
.quick-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

.link-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: var(--lacuna-radius);
    padding: 1.5rem;
    text-align: left;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s var(--lacuna-curve);
}

.link-card h3 {
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.link-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.link-card:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.15);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s var(--lacuna-curve);
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(0, 0, 0, 0.5);
}

.submit-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 1rem 2rem;
    border-radius: 30px;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s var(--lacuna-curve);
    width: 100%;
}

.submit-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.lacunaria-text {
    color: var(--accent);
    font-style: italic;
    font-family: 'Playfair Display', serif;
}

/* Math specific */
.math-row {
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 3px solid var(--accent);
}
.math-formula {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.1rem;
    color: #fff;
    margin-bottom: 0.5rem;
}
.math-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}
.math-desc {
    font-size: 0.95rem;
}

.filters {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.85rem;
}

.filter-btn:hover, .filter-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

@media (max-width: 768px) {
    .quick-links { grid-template-columns: 1fr; }
    .card.lacunaria { padding: 1.5rem; }
    .header-content h1 { font-size: 2.5rem; }
}