/* ===================================================================
   3D FLIP CARDS
   Interactive feature cards with screenshot galleries
   =================================================================== */

/* 3D Context for Flip Animation + Equal Height Layout */
.flip-card-wrapper {
    perspective: 1500px;
    position: relative;
    width: 100%;
    height: 100%;
    /* Fill grid cell height */
    display: flex;
    flex-direction: column;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    flex: 1;
    /* Fill parent height */
    min-height: 520px;
    transition: transform 0.8s cubic-bezier(0.4, 0.0, 0.2, 1);
    transform-style: preserve-3d;
    display: flex;
    flex-direction: column;
}

/* Manual flip trigger via .flipped class (no more hover) */
.flip-card-wrapper.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

/* Toggle Button for Screenshots */
.flip-toggle-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 10;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--glass-regular-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-button);
    backdrop-filter: blur(var(--blur-regular));
    font-size: var(--font-size-body-small);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.flip-toggle-btn:hover {
    background: var(--color-primary);
    color: var(--color-text-on-primary);
    border-color: var(--color-primary);
    transform: scale(1.05);
}

.flip-toggle-btn .icon {
    width: 16px;
    height: 16px;
}

/* Premium card toggle button (white theme) */
.feature-card-premium .flip-toggle-btn {
    background: rgba(255, 255, 255, 0.9);
    color: var(--color-primary);
}

.feature-card-premium .flip-toggle-btn:hover {
    background: #FFFFFF;
    transform: scale(1.05);
}

/* Front and Back Faces - Flex layout for equal heights */
.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    flex-direction: column;
}

.flip-card-front {
    z-index: 2;
    transform: rotateY(0deg);
}

.flip-card-front .feature-card,
.flip-card-front .feature-card-premium {
    cursor: pointer;
    flex: 1;
    /* Fill available height */
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    /* CTA at bottom */
}

.flip-card-back {
    transform: rotateY(180deg);
    z-index: 1;
}

/* Screenshot Gallery on Card Back */
.card-screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.card-screenshot-gallery img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease;
}

.card-screenshot-gallery img:hover {
    transform: scale(1.05);
}

/* Screenshot Caption */
.screenshot-caption {
    font-size: var(--font-size-body-small);
    color: var(--color-text-secondary);
    text-align: center;
    margin-top: var(--spacing-xs);
}

/* Back Card Styling */
.flip-card-back .feature-card {
    background: linear-gradient(135deg,
            var(--color-surface-elevated) 0%,
            var(--color-surface) 100%);
    border: 2px solid var(--color-border);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    min-height: 520px;
}

.flip-card-back h4 {
    font-size: var(--font-size-heading-4);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.flip-card-back .flip-hint {
    text-align: center;
    font-size: var(--font-size-body-small);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

/* Premium Card - Larger Grid for 9 Screenshots */
.flip-card-back[data-card="prime"] .card-screenshot-gallery {
    grid-template-columns: repeat(3, 1fr);
    max-height: 360px;
    overflow-y: auto;
}

/* Mobile: Show/Hide instead of 3D flip */
@media (max-width: 767px) {
    /* Disable hover-based flip */
    .flip-card-wrapper:hover .flip-card-inner {
        transform: none;
    }

    /* Remove 3D settings and fixed min-height */
    .flip-card-inner {
        min-height: auto;
        transition: none;
        transform-style: flat;
        order: 1;
    }

    /* Disable the rotateY when .flipped – use show/hide instead */
    .flip-card-wrapper.flipped .flip-card-inner {
        transform: none;
    }

    .flip-card-front,
    .flip-card-back {
        position: relative;
        transform: none !important;
        backface-visibility: visible;
        width: 100%;
        height: auto;
    }

    /* Default: back hidden, front visible */
    .flip-card-back {
        display: none;
        margin-top: 0;
    }

    /* Flipped state: hide front, show back */
    .flip-card-wrapper.flipped .flip-card-front {
        display: none;
    }
    .flip-card-wrapper.flipped .flip-card-back {
        display: flex;
        flex-direction: column;
    }

    /* Remove fixed heights – let content dictate */
    .flip-card-back .feature-card,
    .flip-card-back .feature-card-premium {
        min-height: auto;
        height: auto;
    }

    /* Toggle button: reposition as a full-width "Details" bar below the card */
    .flip-toggle-btn {
        position: relative;
        top: auto;
        right: auto;
        order: 10;
        width: 100%;
        justify-content: center;
        gap: var(--spacing-sm);
        padding: 12px var(--spacing-md);
        margin-top: var(--spacing-xs);
        border-radius: var(--radius-sm);
        background: var(--color-surface-variant);
        border: 1px solid var(--color-border);
        border-top: none;
        font-size: var(--font-size-body-small);
        font-weight: var(--font-weight-semibold);
        color: var(--color-primary);
        transform: none !important;
    }

    /* Add descriptive text label via CSS */
    .flip-toggle-btn::after {
        content: 'Details anzeigen';
        font-size: var(--font-size-body-small);
        font-weight: var(--font-weight-semibold);
    }

    /* Premium card toggle button */
    .premium-highlight .flip-toggle-btn {
        background: rgba(255,255,255,0.08);
        border-color: rgba(255,255,255,0.18);
        color: rgba(255,255,255,0.75);
    }

    /* Hide toggle when flipped (back card has its own Zurück button) */
    .flip-card-wrapper.flipped .flip-toggle-btn {
        display: none;
    }

    /* Merge front card bottom edge with toggle button bar */
    .flip-card-front .feature-card,
    .flip-card-front .feature-card-premium {
        border-bottom-left-radius: 0;
        border-bottom-right-radius: 0;
    }

    /* Screenshot gallery */
    .card-screenshot-gallery {
        grid-template-columns: repeat(2, 1fr);
    }

    /* ── Step-by-step timelines: stack vertically on mobile ── */
    .step-timeline-compact,
    .scan-go-timeline-compact {
        flex-direction: column !important;
        align-items: center;
        gap: var(--spacing-md) !important;
    }

    /* Rotate arrow indicators 90° to point downward */
    .step-timeline-compact .timeline-arrow-compact,
    .scan-go-timeline-compact .timeline-arrow-compact,
    .step-timeline-compact > [style*="flex-shrink"],
    .scan-go-timeline-compact > [style*="flex-shrink"] {
        transform: rotate(90deg);
    }
}

/* Accessibility: Respect Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .flip-card-inner {
        transition: none;
    }

    .flip-card-wrapper:hover .flip-card-inner {
        transform: none;
    }
}

/* Loading State */
.card-screenshot-gallery img {
    background: var(--color-surface-variant);
}

.card-screenshot-gallery img[loading="lazy"] {
    opacity: 0;
    animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

/* ===================================================================
   PROFESSIONAL CARD BACK DESIGN (Enterprise-Level)
   =================================================================== */

/* Card Back Professional Layout */
.flip-card-back .feature-card,
.flip-card-back .feature-card-premium {
    padding: var(--spacing-lg);
    justify-content: flex-start;
}

/* Card Back Header */
.card-back-heading {
    font-size: var(--font-size-heading-3);
    color: var(--color-text-primary);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.card-back-subheading {
    font-size: var(--font-size-body-small);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border-light);
}

/* ===================================================================
   CARD BACK LAYOUT: Header / Scrollable / Footer
   =================================================================== */

/* The feature-card & feature-card-premium already have display:flex;
   flex-direction:column; overflow:hidden from rules below. These three
   companion classes complete the sticky header + scroll + sticky footer
   pattern. */

.card-back-header {
    flex-shrink: 0;
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border-light);
    margin-bottom: var(--spacing-md);
}

.flip-card-back[data-card="prime"] .card-back-header {
    border-bottom-color: rgba(255, 255, 255, 0.15);
}

.card-back-scrollable {
    flex: 1;
    overflow-y: auto;
    min-height: 0; /* crucial – without this flex-item ignores overflow */
    padding-right: 2px;
}

.card-back-scrollable::-webkit-scrollbar { width: 4px; }
.card-back-scrollable::-webkit-scrollbar-track { background: transparent; }
.card-back-scrollable::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 2px;
}
.flip-card-back[data-card="prime"] .card-back-scrollable::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.18);
}

.card-back-footer {
    flex-shrink: 0;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border-light);
    margin-top: var(--spacing-md);
}

.flip-card-back[data-card="prime"] .card-back-footer {
    border-top-color: rgba(255, 255, 255, 0.15);
}

/* On mobile (static layout) allow the card to expand naturally and
   keep the scrollable area as a normal flow block instead of fixed-height */
@media (max-width: 767px) {
    .card-back-scrollable {
        overflow-y: visible;
        flex: none;
    }

    /* Prevent the 2-column feature grid inside the prime card from
       overflowing narrow screens */
    .flip-card-back[data-card="prime"] .feature-card-premium {
        min-height: auto;
    }

    /* Compact-card images: cap height on small screens */
    .offers-ecosystem-visual-compact img {
        max-height: 180px !important;
    }
}

/* Screenshot Grid with Numbered Labels */
.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.screenshot-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    text-align: center;
}

.screenshot-item img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.screenshot-label {
    font-size: var(--font-size-body-small);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.screenshot-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    background: var(--color-primary);
    color: var(--color-text-on-primary);
    border-radius: 50%;
    font-size: var(--font-size-body-small);
    font-weight: var(--font-weight-bold);
    padding: 0 6px;
}

/* Mini Flow Box */
.mini-flow-box {
    background: var(--color-surface-variant);
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin: var(--spacing-md) 0;
}

.mini-flow-title {
    font-size: var(--font-size-body);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.mini-flow-steps {
    font-size: var(--font-size-body-small);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Card Back CTAs */
.card-back-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: auto;
    padding-top: var(--spacing-md);
}

.card-back-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-button);
    font-size: var(--font-size-body-small);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    border: none;
    text-decoration: none;
}

.card-back-btn-primary {
    background: var(--color-primary);
    color: var(--color-text-on-primary);
}

.card-back-btn-primary:hover {
    background: var(--color-primary-dark);
}

.card-back-btn-secondary {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.card-back-btn-secondary:hover {
    background: var(--color-surface-variant);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Premium Card Overrides */
.flip-card-back[data-card="prime"] .card-back-heading {
    color: var(--color-text-on-primary);
}

.flip-card-back[data-card="prime"] .card-back-subheading {
    color: rgba(255, 255, 255, 0.8);
    border-bottom-color: rgba(255, 255, 255, 0.2);
}

.flip-card-back[data-card="prime"] .screenshot-label {
    color: rgba(255, 255, 255, 0.9);
}

.flip-card-back[data-card="prime"] .screenshot-number {
    background: linear-gradient(135deg, #EC4899 0%, #2563EB 100%);
    color: #FFFFFF;
}

.flip-card-back[data-card="prime"] .mini-flow-box {
    background: rgba(255, 255, 255, 0.1);
    border-left-color: #EC4899;
}

.flip-card-back[data-card="prime"] .mini-flow-title {
    color: var(--color-text-on-primary);
}

.flip-card-back[data-card="prime"] .mini-flow-steps {
    color: rgba(255, 255, 255, 0.8);
}

.flip-card-back[data-card="prime"] .card-back-btn-secondary {
    background: rgba(255, 255, 255, 0.9);
    color: var(--color-primary);
}

/* ===================================================================
   DYNAMIC PREVIEW CONTENT STYLING
   =================================================================== */

/* Preview Container with Scroll */
.flip-card-back .feature-card,
.flip-card-back .feature-card-premium {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.card-preview-header {
    flex-shrink: 0;
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border-light);
    margin-bottom: var(--spacing-md);
}

.card-preview-content {
    flex: 1;
    overflow-y: auto;
    max-height: 320px;
    padding-right: var(--spacing-sm);

    /* Scroll Indicators (Fade Gradients) */
    background:
        /* Shadow at top */
        linear-gradient(white 30%, rgba(255, 255, 255, 0)) center top,
        /* Shadow at bottom */
        linear-gradient(rgba(255, 255, 255, 0), white 70%) center bottom,
        /* Top fade overlay */
        radial-gradient(farthest-side at 50% 0, rgba(0, 0, 0, 0.12), transparent) center top,
        /* Bottom fade overlay */
        radial-gradient(farthest-side at 50% 100%, rgba(0, 0, 0, 0.12), transparent) center bottom;

    background-repeat: no-repeat;
    background-size: 100% 40px, 100% 40px, 100% 14px, 100% 14px;
    background-attachment: local, local, scroll, scroll;
}

/* Premium Card Preview - Dark Background */
.flip-card-back[data-card="prime"] .card-preview-content {
    background:
        linear-gradient(var(--color-primary) 30%, rgba(0, 0, 0, 0)) center top,
        linear-gradient(rgba(0, 0, 0, 0), var(--color-primary) 70%) center bottom,
        radial-gradient(farthest-side at 50% 0, rgba(255, 255, 255, 0.2), transparent) center top,
        radial-gradient(farthest-side at 50% 100%, rgba(255, 255, 255, 0.2), transparent) center bottom;

    background-repeat: no-repeat;
    background-size: 100% 40px, 100% 40px, 100% 14px, 100% 14px;
    background-attachment: local, local, scroll, scroll;
}

/* Custom Scrollbar */
.card-preview-content::-webkit-scrollbar {
    width: 6px;
}

.card-preview-content::-webkit-scrollbar-track {
    background: var(--color-surface-variant);
    border-radius: 3px;
}

.card-preview-content::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: 3px;
}

.card-preview-content::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

/* Sticky Footer with CTAs */
.card-preview-footer {
    flex-shrink: 0;
    display: flex;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-top: 2px solid var(--color-border-light);
    background: linear-gradient(to top, white 80%, transparent);
}

.flip-card-back[data-card="prime"] .card-preview-footer {
    border-top-color: rgba(255, 255, 255, 0.2);
    background: linear-gradient(to top, var(--color-primary) 80%, transparent);
}

/* Loading State */
.card-preview-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    gap: var(--spacing-md);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.card-preview-loading p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-body);
}

/* Error State */
.card-preview-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    gap: var(--spacing-md);
    text-align: center;
}

.card-preview-error .icon {
    color: var(--color-error);
}

.card-preview-error p {
    color: var(--color-text-secondary);
}

/* Content Styling inside Preview */
.card-preview-content h2,
.card-preview-content h3,
.card-preview-content h4 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.card-preview-content p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.card-preview-content ul,
.card-preview-content ol {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.card-preview-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    margin: var(--spacing-sm) 0;
}

/* Premium Toggle Button Styling */
.flip-toggle-btn-premium {
    background: linear-gradient(135deg, #EC4899 0%, #2563EB 100%);
    color: #FFFFFF;
    font-weight: var(--font-weight-bold);
}

.flip-toggle-btn-premium:hover {
    background: linear-gradient(135deg, #2563EB 0%, #EC4899 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(236, 72, 153, 0.3);
}

/* Premium Card Back with Full Width Support */
.premium-highlight .flip-card-wrapper {
    width: 100%;
}

.premium-highlight .flip-card-inner {
    width: 100%;
}

.premium-highlight .flip-card-front,
.premium-highlight .flip-card-back {
    width: 100%;
}

/* Premium Card Back Specific Styling Override */
.flip-card-back[data-card="prime"] .feature-card-premium {
    background: linear-gradient(135deg,
            #000000 0%,
            #1a1a1a 100%);
    border: 2px solid rgba(236, 72, 153, 0.3);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    height: 100%;
    min-height: 520px;
    padding: var(--spacing-lg);
}

.flip-card-back[data-card="prime"] .screenshot-grid {
    grid-template-columns: repeat(3, 1fr);
}

/* Ensure proper gold accents for premium card back */
.flip-card-back[data-card="prime"] .mini-flow-box {
    background: rgba(236, 72, 153, 0.1);
    border-left-color: #EC4899;
}

.flip-card-back[data-card="prime"] .mini-flow-title {
    color: #FFFFFF;
}

/* ── responsive: collapse 2-col feature grid in prime card on mobile ── */
@media (max-width: 520px) {
    .prime-feature-grid {
        grid-template-columns: 1fr !important;
    }
}