/* ==========================================================================
   INTERACTIVE LEAD MAGNET FOOTER & MODAL DISPLAY CONFIGURATION 
   ========================================================================== */

.ebook-popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(15, 23, 26, 0.4);
    backdrop-filter: blur(4px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    box-sizing: border-box;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.ebook-popup-overlay.is-visible {
    opacity: 1;
}

.ebook-popup-card {
    background-color: var(--color-bg-surface);
    border: 1px solid var(--color-border-subtle);
    max-width: 720px;
    width: 100%;
    border-radius: 1rem;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.25);
    padding: 3rem 2.5rem;
    box-sizing: border-box;
    transform: translateY(20px);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.ebook-popup-overlay.is-visible .ebook-popup-card {
    transform: translateY(0);
}

.popup-close-trigger {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    background: transparent;
    border: none;
    color: var(--color-text-disabled);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.popup-close-trigger:hover {
    background-color: var(--color-bg-main);
    color: var(--color-text-main);
}

.popup-grid-layout {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 2.5rem;
    align-items: center;
}

.popup-graphic-pane {
    display: flex;
    justify-content: center;
}

.popup-mock-book {
    width: 130px;
    height: 190px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    border-radius: 0.25rem 0.5rem 0.5rem 0.25rem;
    box-shadow: 8px 12px 24px rgba(15, 23, 42, 0.15);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 1rem;
    box-sizing: border-box;
}

.book-spine-accent {
    position: absolute;
    left: 0;
    top: 0;
    width: 6px;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.15);
    border-radius: 0.25rem 0 0 0.25rem;
}

.book-badge-text {
    color: var(--color-primary-contrast);
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.book-title-text {
    color: var(--color-primary-contrast);
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    text-align: center;
    line-height: 1.3;
}

.popup-form-pane {
    display: flex;
    flex-direction: column;
}

.popup-tagline {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--color-secondary);
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.popup-main-heading {
    font-size: 1.65rem;
    font-weight: 800;
    color: var(--color-text-main);
    margin: 0 0 0.5rem 0;
    letter-spacing: -0.02em;
    line-height: 1.25;
}

.popup-description {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin: 0 0 1.5rem 0;
}

.popup-input-stack {
    display: flex;
    gap: 0.75rem;
    width: 100%;
}

.popup-field {
    flex: 1;
    min-width: 0;
    height: 48px;
    border-radius: 0.5rem;
    border: 1px solid var(--color-border-strong);
    padding: 0 1rem;
    box-sizing: border-box;
    background-color: var(--color-bg-surface);
    color: var(--color-text-main);
    font-size: 0.95rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.popup-field:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.popup-submit-btn {
    height: 48px;
    padding: 0 1.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 0.5rem;
    cursor: pointer;
    border: none;
    background-color: var(--color-primary);
    color: var(--color-primary-contrast);
    transition: background-color 0.15s ease;
    white-space: nowrap;
}

.popup-submit-btn:hover {
    background-color: var(--color-primary-hover);
}

@media (max-width: 680px) {
    .popup-grid-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .popup-graphic-pane {
        margin-bottom: 0.5rem;
    }
    .popup-form-pane {
        text-align: center;
    }
    .popup-input-stack {
        flex-direction: column;
    }
    .popup-field {
        width: 100%;
    }
    .popup-submit-btn {
        width: 100%;
    }
}