/* ═══════════════════════════════════════
   CHRISTMAS MENU FLIPBOOK — PREMIUM
   Hyper-realistic magazine page-turn
   ═══════════════════════════════════════ */

/* ─── Section Container ─── */
.xmas-menu {
    background: linear-gradient(178deg, #080f0b 0%, #0e1a13 35%, #111e17 65%, #0a120d 100%);
    padding: 6rem 0 5rem;
    position: relative;
    overflow: hidden;
}

/* Ambient snow / bokeh particles */
.xmas-menu::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(1.5px 1.5px at  8% 12%, rgba(255,255,255,0.10), transparent),
        radial-gradient(2px   2px   at 22% 55%, rgba(255,255,255,0.07), transparent),
        radial-gradient(1px   1px   at 41% 8%,  rgba(255,255,255,0.12), transparent),
        radial-gradient(2px   2px   at 58% 72%, rgba(255,255,255,0.05), transparent),
        radial-gradient(1px   1px   at 73% 25%, rgba(255,255,255,0.09), transparent),
        radial-gradient(1.5px 1.5px at 88% 65%, rgba(255,255,255,0.06), transparent),
        radial-gradient(1px   1px   at 35% 90%, rgba(255,255,255,0.08), transparent),
        radial-gradient(2px   2px   at 65% 42%, rgba(255,255,255,0.04), transparent);
    pointer-events: none;
    z-index: 0;
    animation: xmas-drift 25s ease-in-out infinite alternate;
}

@keyframes xmas-drift {
    0%   { transform: translate(0, 0); }
    100% { transform: translate(-8px, 6px); }
}

/* Gold filigree line accents */
.xmas-menu::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 5%,
        rgba(194,160,89,0.15) 20%,
        rgba(194,160,89,0.35) 50%,
        rgba(194,160,89,0.15) 80%,
        transparent 95%);
    z-index: 1;
}

.xmas-menu .container {
    position: relative;
    z-index: 1;
}

/* ─── Section Header ─── */
.xmas-menu .section-header {
    color: var(--clr-cream);
    margin-bottom: 3.5rem;
}

.xmas-menu .section-header .section-label {
    color: var(--clr-gold);
}

.xmas-menu .section-header h2 {
    color: #f5f1e8;
    text-shadow: 0 2px 20px rgba(0,0,0,0.4);
}

.xmas-menu .section-header p {
    color: rgba(245, 241, 232, 0.55);
    max-width: 520px;
    margin: 0 auto;
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ─── Flipbook Wrapper ─── */
.flipbook-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2.5rem;
}

.flipbook-viewport {
    --book-scale: 1;
    perspective: 2400px;
    perspective-origin: 50% 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 20px 0;
    height: calc(580px * var(--book-scale) + 40px);
}

/* ─── The Book ─── */
.flipbook {
    position: relative;
    width: 860px;
    height: 580px;
    transform-style: preserve-3d;
    /* Subtle 3D angle for depth + scale */
    transform: scale(var(--book-scale)) rotateX(2deg) translateX(0);
    transform-origin: center center;
    transition: transform 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

/* Center cover (shift left) and back cover (shift right) when closed */
.flipbook.--closed-front {
    transform: scale(var(--book-scale)) rotateX(2deg) translateX(-25%);
}

.flipbook.--closed-back {
    transform: scale(var(--book-scale)) rotateX(2deg) translateX(25%);
}

/* Book shadow on surface */
.flipbook-shadow {
    position: absolute;
    bottom: -30px;
    left: 5%;
    right: 5%;
    height: 40px;
    background: radial-gradient(ellipse at 50% 0%,
        rgba(0,0,0,0.45) 0%,
        rgba(0,0,0,0.15) 50%,
        transparent 80%);
    filter: blur(8px);
    z-index: -1;
    border-radius: 50%;
    pointer-events: none;
}

/* ─── Spine / Binding ─── */
.flipbook::before {
    content: '';
    position: absolute;
    top: -2px;
    bottom: -2px;
    left: calc(50% - 8px);
    width: 16px;
    background:
        linear-gradient(90deg,
            transparent 0%,
            rgba(0,0,0,0.03) 10%,
            rgba(0,0,0,0.12) 25%,
            rgba(0,0,0,0.25) 40%,
            rgba(0,0,0,0.35) 50%,
            rgba(0,0,0,0.25) 60%,
            rgba(0,0,0,0.12) 75%,
            rgba(0,0,0,0.03) 90%,
            transparent 100%);
    z-index: 200;
    pointer-events: none;
}

/* Inner spine highlight (thread stitch) */
.flipbook::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: calc(50% - 0.5px);
    width: 1px;
    background: linear-gradient(180deg,
        transparent 0%,
        rgba(194,160,89,0.08) 15%,
        rgba(194,160,89,0.12) 50%,
        rgba(194,160,89,0.08) 85%,
        transparent 100%);
    z-index: 201;
    pointer-events: none;
}

/* ─── Static Left Page ─── */
.flipbook__static-left {
    position: absolute;
    width: 50%;
    height: 100%;
    top: 0;
    left: 0;
    border-radius: 4px 0 0 4px;
    overflow: hidden;
    background: #efe9dd;
    z-index: 0;
    display: none;
    /* Paper texture overlay */
    box-shadow:
        inset -1px 0 0 rgba(0,0,0,0.06),
        inset 2px 0 6px rgba(0,0,0,0.04),
        -6px 4px 20px rgba(0,0,0,0.25),
        -2px 2px 8px rgba(0,0,0,0.15);
}

.flipbook__static-left::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(90deg,
            transparent 85%,
            rgba(0,0,0,0.03) 95%,
            rgba(0,0,0,0.06) 100%);
    pointer-events: none;
    z-index: 2;
}

.flipbook__static-left img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* Page stack edges (visible below the book) */
.flipbook__page-edges {
    position: absolute;
    top: 3px;
    right: -3px;
    width: 50%;
    height: calc(100% - 6px);
    border-radius: 0 4px 4px 0;
    z-index: -1;
    pointer-events: none;
}

.flipbook__page-edges::before,
.flipbook__page-edges::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    border-radius: 0 4px 4px 0;
}

.flipbook__page-edges::before {
    transform: translateX(2px) translateY(1px);
    background: #e8e2d5;
    box-shadow: 1px 1px 3px rgba(0,0,0,0.08);
}

.flipbook__page-edges::after {
    transform: translateX(4px) translateY(2px);
    background: #e0d9cc;
    box-shadow: 2px 2px 5px rgba(0,0,0,0.1);
}

/* Left-side page stack edges */
.flipbook__page-edges-left {
    position: absolute;
    top: 3px;
    left: -3px;
    width: 50%;
    height: calc(100% - 6px);
    border-radius: 4px 0 0 4px;
    z-index: -1;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.flipbook__page-edges-left.--visible {
    opacity: 1;
}

.flipbook__page-edges-left::before,
.flipbook__page-edges-left::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 4px 0 0 4px;
}

.flipbook__page-edges-left::before {
    transform: translateX(-2px) translateY(1px);
    background: #e8e2d5;
    box-shadow: -1px 1px 3px rgba(0,0,0,0.08);
}

.flipbook__page-edges-left::after {
    transform: translateX(-4px) translateY(2px);
    background: #e0d9cc;
    box-shadow: -2px 2px 5px rgba(0,0,0,0.1);
}

/* ─── Each Leaf ─── */
.flipbook__page {
    position: absolute;
    width: 50%;
    height: 100%;
    top: 0;
    right: 0;
    transform-origin: left center;
    transform-style: preserve-3d;
    transition: transform 1s cubic-bezier(0.645, 0.045, 0.355, 1.000);
    cursor: pointer;
    will-change: transform;
}

.flipbook__page.--flipped {
    transform: rotateY(-180deg);
}

/* ─── Front & Back Faces ─── */
.flipbook__face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    overflow: hidden;
}

.flipbook__face--front {
    border-radius: 0 4px 4px 0;
    box-shadow:
        4px 2px 16px rgba(0,0,0,0.22),
        1px 0 4px rgba(0,0,0,0.10);
}

.flipbook__face--back {
    transform: rotateY(180deg);
    border-radius: 4px 0 0 4px;
    box-shadow:
        -4px 2px 16px rgba(0,0,0,0.22),
        -1px 0 4px rgba(0,0,0,0.10);
}

.flipbook__face img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    user-select: none;
    -webkit-user-drag: none;
}

/* ─── Paper texture & realistic light ─── */
/* Inner page shadow (gutter darkness) */
.flipbook__face--front::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 35px;
    height: 100%;
    background: linear-gradient(90deg,
        rgba(0,0,0,0.10) 0%,
        rgba(0,0,0,0.04) 40%,
        transparent 100%);
    z-index: 3;
    pointer-events: none;
}

.flipbook__face--back::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 35px;
    height: 100%;
    background: linear-gradient(270deg,
        rgba(0,0,0,0.10) 0%,
        rgba(0,0,0,0.04) 40%,
        transparent 100%);
    z-index: 3;
    pointer-events: none;
}

/* Page edge highlight (light catching the paper) */
.flipbook__face--front::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 25px;
    height: 100%;
    background: linear-gradient(270deg,
        rgba(255,255,255,0.06) 0%,
        transparent 100%);
    z-index: 3;
    pointer-events: none;
}

.flipbook__face--back::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 25px;
    height: 100%;
    background: linear-gradient(90deg,
        rgba(255,255,255,0.06) 0%,
        transparent 100%);
    z-index: 3;
    pointer-events: none;
}

/* ─── Dynamic page curl overlay (added by JS during flip) ─── */
.flipbook__curl {
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
    opacity: 0;
    transition: opacity 0.15s ease;
    background: linear-gradient(105deg,
        transparent 30%,
        rgba(255,255,255,0.08) 45%,
        rgba(255,255,255,0.16) 50%,
        rgba(0,0,0,0.06) 55%,
        transparent 70%);
    border-radius: 0 4px 4px 0;
}

.flipbook__page.--turning .flipbook__curl {
    opacity: 1;
}

/* ─── Hover lift ─── */
.flipbook__page:not(.--flipped):hover {
    filter: brightness(1.02);
}

.flipbook__page:not(.--flipped):hover .flipbook__face--front {
    box-shadow:
        6px 4px 24px rgba(0,0,0,0.28),
        2px 1px 6px rgba(0,0,0,0.12);
}

/* ─── Controls ─── */
.flipbook-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.flipbook-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 1px solid rgba(194,160,89,0.35);
    background: rgba(194,160,89,0.06);
    color: var(--clr-gold);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.flipbook-btn:hover:not(:disabled) {
    background: var(--clr-gold);
    color: #111;
    border-color: var(--clr-gold);
    transform: scale(1.08);
    box-shadow: 0 0 20px rgba(194,160,89,0.25);
}

.flipbook-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.flipbook-btn:disabled {
    opacity: 0.2;
    cursor: default;
}

.flipbook-progress {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: rgba(245, 241, 232, 0.45);
    letter-spacing: 0.2em;
    font-weight: 400;
    text-transform: uppercase;
    min-width: 100px;
    text-align: center;
}

/* Page dots */
.flipbook-dots {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

.flipbook-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(194, 160, 89, 0.2);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    padding: 0;
}

.flipbook-dot.--active {
    background: var(--clr-gold);
    transform: scale(1.6);
    box-shadow: 0 0 8px rgba(194,160,89,0.3);
}

.flipbook-dot:hover:not(.--active) {
    background: rgba(194,160,89,0.45);
    transform: scale(1.3);
}

/* CTA */
.xmas-menu__cta {
    margin-top: 0.5rem;
}

.xmas-menu__cta .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

/* ─── Ornamental divider above controls ─── */
.flipbook-ornament {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: rgba(194,160,89,0.25);
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    width: 100%;
    max-width: 400px;
}

.flipbook-ornament::before,
.flipbook-ornament::after {
    content: '';
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(194,160,89,0.2), transparent);
}

/* ─── Responsive ─── */
@media (max-width: 940px) {
    .flipbook {
        width: 640px;
        height: 440px;
    }
    
    .flipbook-viewport {
        height: calc(440px * var(--book-scale, 1) + 40px);
    }

    .xmas-menu {
        padding: 4rem 0 3.5rem;
    }
}

@media (max-width: 700px) {
    .xmas-menu {
        padding: 3rem 0 2.5rem;
    }

    .xmas-menu .section-header {
        margin-bottom: 2rem;
    }

    .flipbook-shadow {
        left: 10%;
        right: 10%;
    }

    .flipbook-ornament {
        display: none;
    }

    .flipbook-controls {
        gap: 1rem;
    }

    .flipbook-wrapper {
        gap: 1.8rem;
    }
}