/* ══════════════════════════════════════════════════
   WING NOTEBOOKS — Component Styles
   Buttons, forms, cards, badges, navigation,
   modals, drawers, accordions, toasts, etc.
   ══════════════════════════════════════════════════ */

/* ── Buttons ── */
.wing-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-body);
    font-size: var(--type-button);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    line-height: 1;
    padding: 14px 28px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--duration-fast) var(--ease-default);
    white-space: nowrap;
}

.wing-btn--primary {
    background-color: var(--color-accent);
    color: #fff;
}

.wing-btn--primary:hover {
    background-color: var(--color-accent-hover);
    color: #fff;
}

.wing-btn--primary:active {
    background-color: var(--color-accent-active);
}

.wing-btn--secondary {
    background-color: transparent;
    color: var(--color-text);
    border: 1.5px solid var(--color-neutral-300);
}

.wing-btn--secondary:hover {
    border-color: var(--color-text);
    background-color: var(--color-neutral-50);
    color: var(--color-text);
}

.wing-btn--dark {
    background-color: var(--color-brand-primary);
    color: #fff;
}

.wing-btn--dark:hover {
    background-color: var(--color-neutral-800);
    color: #fff;
}

.wing-btn--text {
    background: none;
    color: var(--color-accent);
    padding: 0;
    text-transform: none;
    letter-spacing: 0;
    font-weight: 500;
}

.wing-btn--text:hover {
    text-decoration: underline;
    color: var(--color-accent-hover);
}

.wing-btn--sm {
    padding: 8px 16px;
    font-size: 0.8125rem;
}

.wing-btn--lg {
    padding: 16px 32px;
    font-size: 0.9375rem;
}

.wing-btn--full {
    width: 100%;
}

.wing-btn--inverted {
    background-color: #fff;
    color: var(--color-brand-primary);
}

.wing-btn--inverted:hover {
    background-color: var(--color-neutral-100);
    color: var(--color-brand-primary);
}

.wing-btn:disabled,
.wing-btn[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.wing-btn--loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.wing-btn--loading::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: wing-spin 0.6s linear infinite;
}

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

/* ── Badges ── */
.wing-badge {
    display: inline-flex;
    align-items: center;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    line-height: 1.2;
}

.wing-badge--category {
    background: var(--color-neutral-100);
    color: var(--color-neutral-600);
}

.wing-badge--sale {
    background: var(--color-accent);
    color: #fff;
}

.wing-badge--new {
    background: var(--color-brand-primary);
    color: #fff;
}

.wing-badge--in-stock {
    background: var(--color-success-light);
    color: var(--color-success);
}

.wing-badge--low-stock {
    background: var(--color-warning-light);
    color: var(--color-warning);
}

.wing-badge--out-of-stock {
    background: var(--color-error-light);
    color: var(--color-error);
}

.wing-badge--wholesale {
    background: var(--color-info-light);
    color: var(--color-info);
}

/* ── Product Card ── */
.wing-product-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: box-shadow var(--duration-normal) var(--ease-default);
}

.wing-product-card:hover {
    box-shadow: var(--shadow-sm);
}

.wing-product-card__image-wrap {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4 / 5;
    background: var(--color-neutral-100);
}

.wing-product-card__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--duration-slow) var(--ease-default);
}

.wing-product-card:hover .wing-product-card__image {
    transform: scale(1.03);
}

.wing-product-card__badge {
    position: absolute;
    top: var(--space-3);
    left: var(--space-3);
    z-index: 1;
}

.wing-product-card__content {
    padding: var(--space-3) var(--space-3) var(--space-4);
}

@media (min-width: 1024px) {
    .wing-product-card__content {
        padding: var(--space-4);
    }
}

.wing-product-card__category {
    font-size: var(--type-caption);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-1);
}

.wing-product-card__title {
    font-family: var(--font-body);
    font-size: var(--type-small);
    font-weight: 500;
    line-height: 1.4;
    color: var(--color-text);
    margin-bottom: var(--space-2);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

@media (min-width: 1024px) {
    .wing-product-card__title {
        font-size: var(--type-body);
    }
}

.wing-product-card__title a {
    color: inherit;
    text-decoration: none;
}

.wing-product-card__title a:hover {
    color: var(--color-accent);
}

.wing-product-card__price {
    font-family: var(--font-body);
    font-weight: 700;
    font-size: var(--type-body);
    color: var(--color-text);
}

@media (min-width: 1024px) {
    .wing-product-card__price {
        font-size: var(--type-body-large);
    }
}

.wing-product-card__price del {
    font-weight: 400;
    font-size: var(--type-small);
    color: var(--color-text-muted);
    text-decoration: line-through;
    margin-left: var(--space-2);
}

.wing-product-card__price ins {
    text-decoration: none;
}

/* ── Collection Card ── */
.wing-collection-card {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-md);
    aspect-ratio: 3 / 2;
}

.wing-collection-card__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--duration-slow) var(--ease-default);
}

.wing-collection-card:hover .wing-collection-card__image {
    transform: scale(1.03);
}

.wing-collection-card__overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-6) var(--space-6);
    background: linear-gradient(transparent, rgba(28, 25, 23, 0.7));
    color: #fff;
}

.wing-collection-card__title {
    font-family: var(--font-display);
    font-size: var(--type-h3);
    color: #fff;
    margin-bottom: var(--space-1);
}

.wing-collection-card__count {
    font-size: var(--type-small);
    opacity: 0.8;
}

/* ── Journal Card ── */
.wing-journal-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: box-shadow var(--duration-normal) var(--ease-default);
}

.wing-journal-card:hover {
    box-shadow: var(--shadow-sm);
}

.wing-journal-card__image-wrap {
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--color-neutral-100);
}

.wing-journal-card__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.wing-journal-card__content {
    padding: var(--space-4);
}

.wing-journal-card__category {
    font-size: var(--type-caption);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-accent);
    margin-bottom: var(--space-2);
}

.wing-journal-card__title {
    font-family: var(--font-body);
    font-size: var(--type-body-large);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--space-2);
}

.wing-journal-card__title a {
    color: var(--color-text);
    text-decoration: none;
}

.wing-journal-card__title a:hover {
    color: var(--color-accent);
}

.wing-journal-card__excerpt {
    font-size: var(--type-small);
    color: var(--color-text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: var(--space-3);
}

.wing-journal-card__date {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* ── Forms ── */
.wing-form-group {
    margin-bottom: var(--space-4);
}

.wing-form-label {
    display: block;
    font-size: var(--type-small);
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--color-text);
}

.wing-form-label .required {
    color: var(--color-error);
}

.wing-form-input,
.wing-form-textarea,
.wing-form-select {
    width: 100%;
    padding: 12px 16px;
    font-size: var(--type-body);
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-surface);
    border: 1px solid var(--color-neutral-300);
    border-radius: var(--radius-sm);
    transition: border-color var(--duration-fast) var(--ease-default),
                box-shadow var(--duration-fast) var(--ease-default);
}

.wing-form-input:focus,
.wing-form-textarea:focus,
.wing-form-select:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(194, 99, 42, 0.1);
    outline: none;
}

.wing-form-input::placeholder,
.wing-form-textarea::placeholder {
    color: var(--color-text-muted);
}

.wing-form-input--error,
.wing-form-textarea--error {
    border-color: var(--color-error);
}

.wing-form-error {
    font-size: 0.8125rem;
    color: var(--color-error);
    margin-top: var(--space-1);
}

.wing-form-help {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: var(--space-1);
}

.wing-form-textarea {
    min-height: 120px;
    resize: vertical;
}

.wing-form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2378716C' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

.wing-checkbox,
.wing-radio {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    cursor: pointer;
    font-size: var(--type-small);
}

.wing-checkbox input[type="checkbox"],
.wing-radio input[type="radio"] {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    accent-color: var(--color-accent);
    margin-top: 2px;
}

/* ── Rating ── */
.wing-rating {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.wing-rating__stars {
    display: flex;
    gap: 1px;
    color: #D4A017;
    font-size: var(--type-body);
}

.wing-rating__star--empty {
    color: var(--color-neutral-300);
}

.wing-rating__count {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* ── Price ── */
.wing-price {
    font-family: var(--font-body);
    font-weight: 700;
    font-size: var(--type-price);
    color: var(--color-text);
}

.wing-price--large {
    font-size: var(--type-price-large);
}

.wing-price del {
    font-weight: 400;
    font-size: var(--type-small);
    color: var(--color-text-muted);
    margin-left: var(--space-2);
}

.wing-price ins {
    text-decoration: none;
}

.wing-price__discount {
    font-size: var(--type-caption);
    font-weight: 600;
    color: var(--color-accent);
    margin-left: var(--space-2);
}

/* ── Breadcrumb ── */
.wing-breadcrumb {
    margin-bottom: var(--space-4);
}

.wing-breadcrumb__list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.wing-breadcrumb__item {
    display: inline-flex;
    align-items: center;
}

.wing-breadcrumb__item a {
    color: var(--color-text-muted);
}

.wing-breadcrumb__item a:hover {
    color: var(--color-accent);
}

.wing-breadcrumb__item:last-child {
    color: var(--color-text);
    font-weight: 500;
}

.wing-breadcrumb__sep {
    margin: 0 var(--space-1);
    color: var(--color-neutral-300);
}

/* ── Accordion ── */
.wing-accordion__item {
    border-bottom: 1px solid var(--color-border);
}

.wing-accordion__trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--space-4) 0;
    font-size: var(--type-body);
    font-weight: 500;
    text-align: left;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
}

.wing-accordion__icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    transition: transform var(--duration-normal) var(--ease-default);
}

.wing-accordion__item.is-open .wing-accordion__icon {
    transform: rotate(180deg);
}

.wing-accordion__content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--duration-normal) var(--ease-default);
}

.wing-accordion__item.is-open .wing-accordion__content {
    max-height: 2000px;
}

.wing-accordion__body {
    padding-bottom: var(--space-4);
    font-size: var(--type-small);
    color: var(--color-text-secondary);
    line-height: var(--leading-normal);
}

/* ── Alert ── */
.wing-alert {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-sm);
    border-left: 4px solid;
    font-size: var(--type-small);
}

.wing-alert--success {
    background: var(--color-success-light);
    border-color: var(--color-success);
    color: var(--color-success);
}

.wing-alert--warning {
    background: var(--color-warning-light);
    border-color: var(--color-warning);
    color: var(--color-warning);
}

.wing-alert--error {
    background: var(--color-error-light);
    border-color: var(--color-error);
    color: var(--color-error);
}

.wing-alert--info {
    background: var(--color-info-light);
    border-color: var(--color-info);
    color: var(--color-info);
}

/* ── Toast ── */
.wing-toast {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-toast);
    min-width: 300px;
    max-width: 420px;
    padding: var(--space-4);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--color-success);
    font-size: var(--type-small);
    transform: translateX(120%);
    transition: transform var(--duration-slow) var(--ease-out);
}

.wing-toast.is-visible {
    transform: translateX(0);
}

@media (max-width: 639px) {
    .wing-toast {
        right: var(--space-4);
        left: var(--space-4);
        min-width: auto;
    }
}

/* ── Modal ── */
.wing-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    background: var(--color-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-normal) var(--ease-default),
                visibility var(--duration-normal) var(--ease-default);
}

.wing-modal-overlay.is-open {
    opacity: 1;
    visibility: visible;
}

.wing-modal {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    max-width: 560px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: scale(0.95);
    transition: transform var(--duration-slow) var(--ease-out);
}

.wing-modal-overlay.is-open .wing-modal {
    transform: scale(1);
}

.wing-modal__close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
}

/* ── Drawer ── */
.wing-drawer-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-overlay);
    background: var(--color-overlay);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-normal) var(--ease-default),
                visibility var(--duration-normal) var(--ease-default);
}

.wing-drawer-overlay.is-open {
    opacity: 1;
    visibility: visible;
}

.wing-drawer {
    position: fixed;
    top: 0;
    bottom: 0;
    z-index: calc(var(--z-overlay) + 1);
    width: 85vw;
    max-width: 400px;
    background: var(--color-surface);
    box-shadow: var(--shadow-lg);
    transition: transform var(--duration-slow) var(--ease-out);
    overflow-y: auto;
}

.wing-drawer--left {
    left: 0;
    transform: translateX(-100%);
}

.wing-drawer--right {
    right: 0;
    transform: translateX(100%);
}

.wing-drawer-overlay.is-open + .wing-drawer,
.wing-drawer.is-open {
    transform: translateX(0);
}

.wing-drawer__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.wing-drawer__close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
}

/* ── Quantity Selector ── */
.wing-qty {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--color-neutral-300);
    border-radius: var(--radius-sm);
}

.wing-qty__btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--type-body-large);
    color: var(--color-text);
    background: none;
    border: none;
    cursor: pointer;
}

.wing-qty__btn:hover {
    background: var(--color-neutral-50);
}

.wing-qty__input {
    width: 48px;
    height: 40px;
    text-align: center;
    font-weight: 500;
    border: none;
    border-left: 1px solid var(--color-neutral-300);
    border-right: 1px solid var(--color-neutral-300);
    background: none;
    -moz-appearance: textfield;
}

.wing-qty__input::-webkit-inner-spin-button,
.wing-qty__input::-webkit-outer-spin-button {
    appearance: none;
}

/* ── Variant Selector ── */
.wing-variant-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.wing-variant-chip {
    padding: 8px 16px;
    border: 1px solid var(--color-neutral-300);
    border-radius: var(--radius-sm);
    font-size: var(--type-small);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-default);
    background: none;
}

.wing-variant-chip:hover {
    border-color: var(--color-neutral-600);
}

.wing-variant-chip.is-selected {
    background: var(--color-brand-primary);
    color: #fff;
    border-color: var(--color-brand-primary);
}

.wing-variant-chip.is-disabled {
    opacity: 0.4;
    cursor: not-allowed;
    text-decoration: line-through;
}

/* ── Pagination ── */
.wing-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-12);
}

.wing-pagination__item {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--type-small);
    font-weight: 500;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: background var(--duration-fast) var(--ease-default);
}

.wing-pagination__item:hover {
    background: var(--color-neutral-100);
    color: var(--color-text);
}

.wing-pagination__item.is-current {
    background: var(--color-brand-primary);
    color: #fff;
}

.wing-pagination__item.is-disabled {
    opacity: 0.3;
    pointer-events: none;
}

/* ── Skeleton Loading ── */
.wing-skeleton {
    background: linear-gradient(90deg, var(--color-neutral-200) 25%, var(--color-neutral-100) 50%, var(--color-neutral-200) 75%);
    background-size: 200% 100%;
    animation: wing-skeleton-pulse 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

@keyframes wing-skeleton-pulse {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.wing-skeleton--text {
    height: 16px;
    margin-bottom: var(--space-2);
}

.wing-skeleton--text:last-child {
    width: 60%;
}

.wing-skeleton--image {
    aspect-ratio: 4 / 5;
}

/* ── Trust Bar ── */
.wing-trust-bar {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
    padding: var(--space-8) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

@media (max-width: 639px) {
    .wing-trust-bar {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        gap: var(--space-3);
        padding: var(--space-4) var(--grid-padding);
        margin: 0 calc(-1 * var(--grid-padding));
        scrollbar-width: none;
        border-top: 1px solid var(--color-border);
        border-bottom: 1px solid var(--color-border);
    }

    .wing-trust-bar::-webkit-scrollbar {
        display: none;
    }

    .wing-trust-item {
        flex: 0 0 220px;
        scroll-snap-align: start;
        background: var(--color-surface);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
        padding: var(--space-3) var(--space-4);
        text-align: center;
    }
}

@media (min-width: 768px) {
    .wing-trust-bar {
        grid-template-columns: repeat(4, 1fr);
    }
}

.wing-trust-item {
    text-align: center;
    padding: var(--space-4);
}

.wing-trust-item__icon {
    font-size: 1.5rem;
    margin-bottom: var(--space-2);
}

.wing-trust-item__title {
    font-size: var(--type-small);
    font-weight: 600;
    margin-bottom: var(--space-1);
}

.wing-trust-item__text {
    font-size: var(--type-caption);
    color: var(--color-text-muted);
}

/* ── Empty State ── */
.wing-empty-state {
    text-align: center;
    padding: var(--space-20) var(--space-4);
    max-width: 480px;
    margin: 0 auto;
}

.wing-empty-state__title {
    font-size: var(--type-h2);
    margin-bottom: var(--space-4);
}

.wing-empty-state__text {
    font-size: var(--type-body);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
}

/* ── Newsletter ── */
.wing-newsletter {
    display: flex;
    gap: var(--space-3);
    max-width: 480px;
}

.wing-newsletter__input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--color-neutral-300);
    border-radius: var(--radius-sm);
    font-size: var(--type-body);
    background: var(--color-surface);
}

.wing-newsletter__input:focus {
    border-color: var(--color-accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(194, 99, 42, 0.1);
}

@media (max-width: 479px) {
    .wing-newsletter {
        flex-direction: column;
    }
}

/* ══════════════════════════════════════════════════
   3D Interactive Book & Notebook Paper Components
   ══════════════════════════════════════════════════ */

/* ── 3D Book Stage & Presentation ── */
.wing-book-stage {
    perspective: 1600px;
    perspective-origin: 50% 50%;
    position: relative;
    padding: var(--space-8) 0;
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    user-select: none;
}

.wing-book-wrapper {
    position: relative;
    width: 100%;
    background: #1e1b18; /* Hardbound Cover Backing */
    border-radius: 12px;
    padding: 10px 14px 14px 14px;
    box-shadow: var(--shadow-book-flat);
    transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.6s ease;
    transform: rotateX(8deg) rotateY(-4deg);
}

.wing-book-wrapper:hover {
    transform: rotateX(4deg) rotateY(-2deg) translateY(-4px);
    box-shadow: 0 16px 36px -4px rgba(28, 25, 23, 0.22), 0 30px 65px -10px rgba(28, 25, 23, 0.3);
}

/* Brass Metal Corners on Cover */
.wing-book-corner {
    position: absolute;
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-foil-gold);
    pointer-events: none;
    z-index: 10;
}

.wing-book-corner--tl { top: 6px; left: 6px; border-right: none; border-bottom: none; border-top-left-radius: 6px; }
.wing-book-corner--tr { top: 6px; right: 6px; border-left: none; border-bottom: none; border-top-right-radius: 6px; }
.wing-book-corner--bl { bottom: 6px; left: 6px; border-right: none; border-top: none; border-bottom-left-radius: 6px; }
.wing-book-corner--br { bottom: 6px; right: 6px; border-left: none; border-top: none; border-bottom-right-radius: 6px; }

/* Open Book Pages Spread */
.wing-book-spread {
    position: relative;
    display: flex;
    background: var(--color-paper-ivory);
    border-radius: 6px;
    overflow: visible;
    min-height: 400px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}

@media (max-width: 640px) {
    .wing-book-spread {
        min-height: 350px;
    }
}

/* Central 180° Lay-Flat Smyth-Sewn Spine Valley */
.wing-book-spine {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 36px;
    transform: translateX(-50%);
    background: linear-gradient(to right, 
        rgba(0,0,0,0.18) 0%, 
        rgba(0,0,0,0.06) 35%, 
        rgba(0,0,0,0.22) 50%, 
        rgba(0,0,0,0.06) 65%, 
        rgba(0,0,0,0.18) 100%
    );
    z-index: 8;
    pointer-events: none;
}

/* Stitched Thread Accent along spine */
.wing-book-spine::after {
    content: '';
    position: absolute;
    top: 15px;
    bottom: 15px;
    left: 50%;
    width: 2px;
    transform: translateX(-50%);
    border-left: 1px dashed rgba(255, 255, 255, 0.45);
}

/* Satin Hanging Ribbon Bookmark */
.wing-book-ribbon {
    position: absolute;
    top: -6px;
    left: 49%;
    width: 14px;
    height: calc(100% + 48px);
    background: linear-gradient(135deg, #A84218 0%, #C2632A 60%, #873210 100%);
    z-index: 12;
    transform: rotate(2.5deg);
    box-shadow: 2px 4px 8px rgba(0,0,0,0.25);
    pointer-events: none;
    transition: transform 0.4s ease;
}

/* Ribbon notched V-tail */
.wing-book-ribbon::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 0;
    border-left: 7px solid transparent;
    border-right: 7px solid transparent;
    border-bottom: 9px solid var(--color-paper-warm);
}

/* Individual Book Pages */
.wing-book-page {
    flex: 1;
    position: relative;
    padding: var(--space-6) var(--space-5);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow: hidden;
    background-color: var(--color-paper-ivory);
    transition: background 0.3s ease;
}

@media (min-width: 640px) {
    .wing-book-page {
        padding: var(--space-8) var(--space-6);
    }
}

.wing-book-page--left {
    border-top-left-radius: 6px;
    border-bottom-left-radius: 6px;
    box-shadow: inset -16px 0 18px -10px rgba(0, 0, 0, 0.12);
    border-right: 1px solid rgba(0,0,0,0.06);
}

.wing-book-page--right {
    border-top-right-radius: 6px;
    border-bottom-right-radius: 6px;
    box-shadow: inset 16px 0 18px -10px rgba(0, 0, 0, 0.12);
    border-left: 1px solid rgba(0,0,0,0.06);
}

/* Stack of Paper Edges Effect (Book Block Depth) */
.wing-book-page--left::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 4px;
    bottom: 4px;
    width: 6px;
    background: repeating-linear-gradient(to right, #F5EFE6, #E7DEC8 1px, #F5EFE6 2px);
    border-radius: 3px 0 0 3px;
    box-shadow: -2px 0 4px rgba(0,0,0,0.1);
}

.wing-book-page--right::after {
    content: '';
    position: absolute;
    right: -6px;
    top: 4px;
    bottom: 4px;
    width: 6px;
    background: repeating-linear-gradient(to right, #F5EFE6, #E7DEC8 1px, #F5EFE6 2px);
    border-radius: 0 3px 3px 0;
    box-shadow: 2px 0 4px rgba(0,0,0,0.1);
}

/* Page Header & Metadata */
.wing-book-page__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-paper-line);
    margin-bottom: var(--space-4);
    font-size: 0.6875rem;
    font-family: var(--font-body);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-neutral-500);
}

.wing-book-page__title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--color-neutral-900);
    margin-bottom: var(--space-2);
    line-height: 1.2;
}

.wing-book-page__body {
    flex: 1;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-neutral-800);
}

.wing-book-page__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--space-4);
    padding-top: var(--space-2);
    border-top: 1px solid var(--color-paper-line);
    font-size: 0.6875rem;
    color: var(--color-neutral-400);
}

/* Realistic Page Flip Overlay Effect */
.wing-book-flippable {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 50%;
    transform-origin: left center;
    transform-style: preserve-3d;
    transition: transform 0.75s cubic-bezier(0.645, 0.045, 0.355, 1);
    z-index: 10;
    border-top-right-radius: 6px;
    border-bottom-right-radius: 6px;
    pointer-events: none;
}

.wing-book-flippable.is-flipping {
    transform: rotateY(-180deg);
}

.wing-book-flippable__front,
.wing-book-flippable__back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    padding: var(--space-6) var(--space-5);
    background-color: var(--color-paper-ivory);
    box-shadow: 0 4px 14px rgba(0,0,0,0.15);
}

.wing-book-flippable__front {
    border-top-right-radius: 6px;
    border-bottom-right-radius: 6px;
}

.wing-book-flippable__back {
    transform: rotateY(180deg);
    border-top-left-radius: 6px;
    border-bottom-left-radius: 6px;
    background-color: var(--color-paper-warm);
    box-shadow: inset -12px 0 20px -8px rgba(0,0,0,0.18);
}

/* Interactive Book Controls Toolbar */
.wing-book-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--space-4);
    gap: var(--space-3);
    flex-wrap: wrap;
}

.wing-book-controls__pills {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.wing-book-pill {
    padding: 5px 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-neutral-300);
    background: var(--color-surface);
    color: var(--color-neutral-700);
    cursor: pointer;
    transition: all 0.2s ease;
}

.wing-book-pill:hover,
.wing-book-pill.is-active {
    background: var(--color-brand-primary);
    color: #fff;
    border-color: var(--color-brand-primary);
    transform: translateY(-1px);
}

.wing-book-nav-btns {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.wing-book-nav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 1.5px solid var(--color-neutral-300);
    color: var(--color-brand-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
}

.wing-book-nav-btn:hover {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

/* Floating Pinned Tags & Sticky Notes on Hero */
.wing-book-tag {
    position: absolute;
    background: #FFFDF0;
    padding: 8px 14px;
    border-radius: 2px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.12), 0 1px 3px rgba(0,0,0,0.08);
    font-family: var(--font-handwriting);
    font-size: 1.125rem;
    color: var(--color-ink-blue);
    font-weight: 700;
    z-index: 15;
    pointer-events: none;
    line-height: 1.1;
    border: 1px solid rgba(0,0,0,0.05);
}

.wing-book-tag--1 {
    top: -16px;
    right: 20px;
    transform: rotate(3deg);
}

.wing-book-tag--2 {
    bottom: -18px;
    left: 24px;
    transform: rotate(-3.5deg);
    color: var(--color-accent);
}

/* ── Realistic Physical Notebook Product Cards ── */
.wing-notebook-card {
    position: relative;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.35s ease;
    display: flex;
    flex-direction: column;
}

.wing-notebook-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-card-elevated);
}

/* Notebook Cover Simulation inside Product Card */
.wing-notebook-cover {
    position: relative;
    width: 100%;
    aspect-ratio: 3 / 4;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: var(--space-4);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: var(--space-6) var(--space-5);
    box-shadow: inset -4px 0 10px rgba(0,0,0,0.15), 0 6px 14px rgba(0,0,0,0.12);
    transition: transform 0.3s ease;
}

.wing-notebook-card:hover .wing-notebook-cover {
    transform: scale(1.02);
}

/* Spine Crease Line on Notebook Cover */
.wing-notebook-cover::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 20px;
    width: 4px;
    background: rgba(0, 0, 0, 0.15);
    box-shadow: 1px 0 2px rgba(255, 255, 255, 0.1);
}

/* Elastic Band Closure */
.wing-notebook-band {
    position: absolute;
    top: 0;
    bottom: 0;
    right: 28px;
    width: 12px;
    background: rgba(20, 20, 20, 0.7);
    box-shadow: inset 1px 0 2px rgba(255,255,255,0.15), 2px 0 4px rgba(0,0,0,0.25);
    z-index: 3;
}

/* Debossed Gold Foil Badge on Cover */
.wing-cover-foil-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    letter-spacing: 0.02em;
    color: #D4AF37;
    text-shadow: 0 1px 1px rgba(0,0,0,0.6), 0 -1px 1px rgba(255,255,255,0.2);
    z-index: 2;
}

.wing-cover-subtitle {
    font-family: var(--font-body);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.75);
    z-index: 2;
}

/* Bookmark Ribbon hanging below cover */
.wing-cover-ribbon {
    position: absolute;
    bottom: -10px;
    left: 45px;
    width: 10px;
    height: 24px;
    background: var(--color-accent);
    box-shadow: 1px 2px 4px rgba(0,0,0,0.2);
    z-index: 4;
}

.wing-cover-ribbon::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 6px solid var(--color-surface);
}

/* ── Wax Seal Stamp Badge ── */
.wing-wax-seal {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #B91C1C, #7F1D1D);
    color: #FDF2E9;
    box-shadow: 
        inset 0 2px 3px rgba(255,255,255,0.35),
        inset 0 -2px 3px rgba(0,0,0,0.4),
        0 4px 8px rgba(0,0,0,0.25);
    position: relative;
    border: 2px solid #661818;
}

.wing-wax-seal__text {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-shadow: 0 -1px 1px rgba(0,0,0,0.6);
}

/* ── Sticky Post-It Note Callout ── */
.wing-sticky-note {
    background: #FEF9C3;
    padding: var(--space-6);
    border-radius: 2px;
    box-shadow: 0 8px 16px -2px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    position: relative;
    transform: rotate(-1.5deg);
    transition: transform 0.3s ease;
}

.wing-sticky-note:hover {
    transform: rotate(0deg) scale(1.02);
}

.wing-sticky-note .wing-tape {
    top: -10px;
    background: rgba(240, 230, 210, 0.75);
}