.glossary-popup {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.glossary-popup.active {
    pointer-events: auto;
    opacity: 1;
}

.glossary-popup-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.glossary-popup-container {
    position: relative;
    width: 100%;
    max-width: 560px;
    max-height: calc(100vh - var(--space-10));
    background: var(--surface-color);
    border: 1px solid var(--border-visible);
    border-radius: 12px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: translateY(20px) scale(0.98);
    transition: transform 0.25s ease;
}

.glossary-popup.active .glossary-popup-container {
    transform: translateY(0) scale(1);
}

.glossary-popup-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--border-subtle);
}

.glossary-popup-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.glossary-popup-category {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--space-1) var(--space-3);
    border-radius: 100px;
}

.glossary-popup-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: 1px solid var(--border-visible);
    border-radius: 8px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.15s ease;
}

.glossary-popup-close:hover {
    background: var(--bg-color);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.glossary-popup-body {
    flex: 1;
    padding: var(--space-7) var(--space-6);
    overflow-y: auto;
}

.glossary-popup-term {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 500;
    color: var(--text-heading);
    margin-bottom: var(--space-5);
    line-height: 1.2;
}

.glossary-popup-definition {
    font-size: 0.95rem;
    color: var(--text-main);
    line-height: 1.75;
    margin-bottom: var(--space-6);
}

.glossary-popup-why {
    background: var(--bg-color);
    border-radius: 8px;
    padding: var(--space-5);
}

.glossary-popup-why-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    display: block;
    margin-bottom: var(--space-2);
}

.glossary-popup-why-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.65;
    font-style: italic;
}

.glossary-popup-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--border-subtle);
    background: var(--bg-color);
}

.glossary-popup-nav {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.glossary-popup-prev,
.glossary-popup-next {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--surface-color);
    border: 1px solid var(--border-visible);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
}

.glossary-popup-prev:hover,
.glossary-popup-next:hover {
    background: var(--surface-color);
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.glossary-popup-counter {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    min-width: 50px;
    text-align: center;
}

.glossary-popup-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.15s ease;
}

.glossary-popup-link:hover {
    color: var(--accent);
}

@media (max-width: 600px) {
    .glossary-popup {
        padding: var(--space-4);
        align-items: flex-end;
    }

    .glossary-popup-container {
        max-height: 85vh;
        border-radius: 16px 16px 0 0;
    }

    .glossary-popup.active .glossary-popup-container {
        transform: translateY(0);
    }
}