/* =========================================================
   MODAL
========================================================= */

body.flipbook-open {
    overflow: hidden;
}

.flipbook-modal {
    position: fixed;
    inset: 0;
    z-index: 9999;

    display: none;

    padding: 18px;

    opacity: 0;
    visibility: hidden;

    transition:
        opacity 0.25s ease,
        visibility 0.25s ease;
}

.flipbook-modal.is-open {
    display: flex;
    align-items: center;
    justify-content: center;

    opacity: 1;
    visibility: visible;
}

.flipbook-backdrop {
    position: absolute;
    inset: 0;

    background: rgba(18, 13, 11, 0.88);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.flipbook-dialog {
    position: relative;
    z-index: 2;

    display: flex;
    flex-direction: column;

    width: min(1380px, 100%);
    height: min(920px, calc(100vh - 36px));

    overflow: hidden;

    background: #f3efe9;
    border-radius: 8px;

    box-shadow: 0 30px 100px rgba(0, 0, 0, 0.4);

    transform: translateY(18px) scale(0.985);

    transition: transform 0.25s ease;
}

.flipbook-modal.is-open .flipbook-dialog {
    transform: translateY(0) scale(1);
}

.flipbook-page {
    position: relative;
    overflow: hidden;
    background: #ffffff;
}

.flipbook-page img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;

    image-rendering: auto;

    user-select: none;
    -webkit-user-select: none;
    -webkit-user-drag: none;

    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.flipbook-page {
    position: relative;
}

.flipbook-page img {
    cursor: zoom-in;
    touch-action: manipulation;
    -webkit-user-select: none;
    user-select: none;
}

.flipbook-page::after {
    content: "\f00e";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;

    position: absolute;
    right: 12px;
    bottom: 12px;

    display: grid;
    place-items: center;

    width: 38px;
    height: 38px;

    border-radius: 50%;

    color: #ffffff;
    background: rgba(0, 0, 0, 0.65);

    pointer-events: none;
    opacity: 0;
    transform: translateY(5px);

    transition:
        opacity 0.2s ease,
        transform 0.2s ease;
}

.flipbook-page:hover::after {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .flipbook-page::after {
        width: 34px;
        height: 34px;
        right: 8px;
        bottom: 8px;

        opacity: 0.85;
        transform: none;
    }
}

/* =========================================================
   MODAL HEADER
========================================================= */

.flipbook-modal-header {
    position: relative;
    z-index: 20;

    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;

    min-height: 92px;
    padding: 18px 28px;

    background: #f3efe9;
    border-bottom: 1px solid rgba(23, 23, 23, 0.12);
}

.flipbook-modal-heading {
    text-align: left;
}

.flipbook-modal-heading .section-label {
    margin: 0 0 4px;
}

.flipbook-modal-heading h2 {
    margin: 0;

    font-family: "DM Serif Display", serif;
    font-size: clamp(1.7rem, 3vw, 2.6rem);
    font-weight: 400;
    line-height: 1;
}

.flipbook-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 48px;
    height: 48px;
    flex: 0 0 48px;

    padding: 0;

    color: #171717;
    background: transparent;

    border: 1px solid rgba(23, 23, 23, 0.4);
    border-radius: 50%;

    font-family: Arial, sans-serif;
    font-size: 2rem;
    font-weight: 300;
    line-height: 1;

    cursor: pointer;

    transition:
        color 0.2s ease,
        background-color 0.2s ease,
        transform 0.2s ease;
}

.flipbook-close:hover {
    color: #ffffff;
    background-color: #171717;
    transform: rotate(90deg);
}


/* =========================================================
   FLIPBOOK VIEWER
========================================================= */

.flipbook-viewer {
    position: relative;

    display: flex;
    align-items: center;
    justify-content: center;
    gap: 22px;

    min-height: 0;
    flex: 1;

    padding: 24px 28px;

    overflow: hidden;

    background:
        radial-gradient(
            circle at center,
            rgba(255, 255, 255, 0.72),
            rgba(220, 211, 201, 0.4)
        );
}

.flipbook-shell {
    position: relative;

    display: flex;
    align-items: center;
    justify-content: center;

    width: min(1100px, calc(100vw - 220px));
    height: 100%;
    max-height: 720px;

    overflow: visible;
}

.flipbook {
    width: 100%;
    height: 100%;

    opacity: 0;
    visibility: hidden;

    backface-visibility: hidden;
    transform: translateZ(0);

    transition: opacity 0.2s ease;
}

.flipbook.is-ready {
    opacity: 1;
    visibility: visible;
}


/* =========================================================
   LOADING STATE
========================================================= */

.flipbook-loading {
    position: absolute;
    inset: 0;
    z-index: 30;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;

    color: #655e58;

    font-family: "Montserrat", sans-serif;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.flipbook-loading.is-hidden {
    display: none;
}

.flipbook-spinner {
    width: 36px;
    height: 36px;

    border: 2px solid rgba(23, 23, 23, 0.18);
    border-top-color: #171717;
    border-radius: 50%;

    animation: flipbook-spin 0.8s linear infinite;
}

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


/* =========================================================
   NAVIGATION CONTROLS
========================================================= */

.flipbook-control {
    position: relative;
    z-index: 40;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    width: 52px;
    height: 52px;
    flex: 0 0 52px;

    padding: 0;

    color: #ffffff;
    background: #171717;

    border: 1px solid #171717;
    border-radius: 50%;

    font-size: 1.35rem;
    line-height: 1;

    cursor: pointer;

    transition:
        color 0.2s ease,
        background-color 0.2s ease,
        opacity 0.2s ease,
        transform 0.2s ease;
}

.flipbook-control:hover:not(:disabled) {
    color: #171717;
    background: #ffffff;
    transform: scale(1.06);
}

.flipbook-control:disabled {
    opacity: 0.25;
    cursor: not-allowed;
}


/* =========================================================
   MODAL FOOTER
========================================================= */

.flipbook-modal-footer {
    position: relative;
    z-index: 20;

    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;

    min-height: 84px;
    padding: 14px 28px;

    background: #f3efe9;
    border-top: 1px solid rgba(23, 23, 23, 0.12);
}

.page-information {
    font-family: "Montserrat", sans-serif;
    font-size: 0.78rem;
    letter-spacing: 0.04em;
}

.page-information strong {
    font-weight: 700;
}

.flipbook-footer-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.fullscreen-button,
.flipbook-modal-footer .download-button {
    min-height: 46px;
}


/* =========================================================
   TABLET
========================================================= */

@media (max-width: 950px) {
    .flipbook-modal {
        padding: 10px;
    }

    .flipbook-dialog {
        height: calc(100vh - 20px);
    }

    .flipbook-viewer {
        padding: 18px 12px;
    }

    .flipbook-shell {
        width: min(76vw, 560px);
        max-height: 680px;
    }

    .flipbook-control {
        position: absolute;
        top: 50%;

        transform: translateY(-50%);
    }

    .flipbook-control:hover:not(:disabled) {
        transform: translateY(-50%) scale(1.06);
    }

    .flipbook-previous {
        left: 14px;
    }

    .flipbook-next {
        right: 14px;
    }
}


/* =========================================================
   MOBILE
========================================================= */

@media (max-width: 600px) {
    .hero-buttons,
    .catalogue-actions {
        align-items: stretch;
    }

    .hero-buttons a,
    .catalogue-actions a,
    .catalogue-actions button {
        width: 100%;
    }

    .flipbook-modal {
        padding: 0;
    }

    .flipbook-dialog {
        width: 100%;
        height: 100%;
        max-height: none;

        border-radius: 0;
    }

    .flipbook-modal-header {
        min-height: 72px;
        padding: 12px 14px;
    }

    .flipbook-modal-heading .section-label {
        display: none;
    }

    .flipbook-modal-heading h2 {
        font-size: 1.55rem;
    }

    .flipbook-close {
        width: 42px;
        height: 42px;
        flex-basis: 42px;
    }

    .flipbook-viewer {
        padding: 10px 4px;
    }

    .flipbook-shell {
        width: min(94vw, 480px);
        max-height: none;
    }

    .flipbook-control {
        width: 40px;
        height: 40px;
        flex-basis: 40px;

        background: rgba(23, 23, 23, 0.85);
    }

    .flipbook-previous {
        left: 6px;
    }

    .flipbook-next {
        right: 6px;
    }

    .flipbook-modal-footer {
        min-height: 72px;
        padding: 10px 14px;
    }

    .flipbook-footer-actions {
        gap: 8px;
    }

    .fullscreen-button {
        display: none;
    }

    .flipbook-modal-footer .download-button {
        min-height: 42px;
        padding: 0 14px;

        font-size: 0.68rem;
    }
}


/* =========================================================
   REDUCED MOTION
========================================================= */

@media (prefers-reduced-motion: reduce) {
    .flipbook-modal,
    .flipbook-dialog,
    .flipbook,
    .flipbook-close,
    .flipbook-control {
        transition: none;
    }

    .flipbook-spinner {
        animation: none;
    }
}

/* =========================================================
   FLIPBOOK MOBILE STABILITY PATCH
   Add this at the very end of flipbook.css
========================================================= */

.flipbook,
.flipbook-page,
.flipbook-page img {
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
}

.flipbook-page {
    contain: layout paint;
}

.flipbook-page img {
    pointer-events: auto;
}

@media (max-width: 950px) {
    .flipbook-viewer {
        min-height: 0;
    }

    .flipbook-shell {
        height: 100%;
        min-height: 0;
    }

    .flipbook {
        min-width: 0;
        min-height: 0;
    }
}

@media (max-width: 600px) {
    .flipbook-dialog {
        height: 100dvh;
    }

    .flipbook-modal-header,
    .flipbook-modal-footer {
        flex-shrink: 0;
    }

    .flipbook-viewer {
        flex: 1 1 auto;
        height: auto;
        min-height: 0;
    }

    .flipbook-shell {
        width: calc(100vw - 8px);
        height: 100%;
        min-height: 0;
    }
}