/* CSS Variables & Theme Design System */
:root {
    --bg-primary: #0a0814;
    --bg-secondary: #141026;
    --card-bg: rgba(20, 15, 38, 0.94);
    --card-border: rgba(186, 140, 255, 0.25);
    --accent-gold: #ffd166;
    --accent-pink: #ff758c;
    --accent-purple: #9d4edd;
    --accent-glow: #c77dff;
    --accent-cyan: #4cc9f0;
    --text-main: #f8f9fa;
    --text-muted: #a099c2;
    --font-heading: 'Cinzel', serif;
    --font-body: 'Outfit', sans-serif;
    --font-cursive: 'Sacramento', cursive;
    --shadow-glow: 0 15px 45px rgba(157, 78, 221, 0.35);
    --radius-lg: 24px;
    --radius-md: 14px;
    --transition-fast: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --physics-opening: 1.8s cubic-bezier(0.22, 1, 0.36, 1);
    --physics-page-flip: 0.85s cubic-bezier(0.25, 1, 0.5, 1);
}

/* Reset & Base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    font-family: var(--font-body);
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 20px 0;
}

/* Ambient Canvas Background */
#bgCanvas {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
}

/* Floating Book Action Controls (Top Corner) */
.book-top-actions {
    position: fixed;
    top: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 100;
    pointer-events: none;
}

.secret-seal-btn {
    pointer-events: auto;
    background: rgba(26, 21, 48, 0.85);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(12px);
    color: var(--text-main);
    padding: 8px 18px;
    border-radius: 30px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 0.88rem;
    font-weight: 500;
    transition: var(--transition-fast);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

.secret-seal-btn:hover {
    background: rgba(157, 78, 221, 0.3);
    border-color: var(--accent-gold);
    transform: translateY(-2px);
}

.secret-seal-btn.active-secret {
    background: rgba(255, 117, 140, 0.25);
    border-color: var(--accent-pink);
    color: var(--accent-pink);
}

.chapter-indicator-badge {
    background: rgba(26, 21, 48, 0.85);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(12px);
    color: var(--accent-gold);
    padding: 8px 18px;
    border-radius: 30px;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

/* ==========================================================================
   1. 3D BOOK STAGE & PERSPECTIVE (REALISTIC PHYSICAL BOOK ARCHITECTURE)
   ========================================================================== */
.book-stage {
    position: relative;
    width: 100%;
    max-width: 960px;
    min-height: 640px;
    margin: 30px auto;
    z-index: 10;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 1.5rem;
}

.book-perspective-wrapper {
    position: relative;
    width: 100%;
    min-height: 600px;
    perspective: 1800px; /* 3D Depth Perspective */
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 3D Book Object (Target for Mouse Parallax Tilt) */
.book-3d-object {
    position: relative;
    width: 100%;
    min-height: 580px;
    transform-style: preserve-3d;
    transition: transform 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
    transform: rotateX(8deg) rotateY(-4deg); /* Initial subtle physical desktop view angle */
}

/* Dynamic Table Drop Shadow */
.book-table-shadow {
    position: absolute;
    bottom: -35px;
    left: 5%;
    width: 90%;
    height: 45px;
    background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.85) 0%, rgba(0, 0, 0, 0.4) 50%, transparent 80%);
    border-radius: 50%;
    filter: blur(14px);
    transition: transform 0.5s ease, opacity 0.5s ease, filter 0.5s ease;
    z-index: 1;
    pointer-events: none;
}

/* Book Lift State Shadow Adjustment */
.book-3d-object.is-lifted .book-table-shadow {
    transform: translateY(20px) scale(0.92);
    opacity: 0.6;
    filter: blur(20px);
}

/* 3D Physical Spine Binding Anchor (Closed state side spine) */
.book-spine-3d {
    position: absolute;
    top: -2px;
    bottom: -2px;
    left: 0;
    width: 28px;
    background: linear-gradient(135deg, #1b122e, #0c0817);
    border-left: 2px solid var(--accent-gold);
    border-radius: 8px 0 0 8px;
    z-index: 5; /* POSITIONED BEHIND FLIPPING SHEET (z-index: 50) SO TURNED PAPER COVERS THE GOLD SPINE LINE */
    box-shadow: -4px 0 15px rgba(0, 0, 0, 0.8), inset 0 0 10px rgba(157, 78, 221, 0.3);
}

.spine-texture {
    width: 100%;
    height: 100%;
    background-image: repeating-linear-gradient(0deg, transparent, transparent 30px, rgba(255, 209, 102, 0.2) 31px);
}

/* Physical Paper Stack Edges (Thickness volume layers) */
.paper-stack-left, .paper-stack-right {
    position: absolute;
    top: 6px;
    bottom: 6px;
    width: 16px;
    z-index: 8;
    pointer-events: none;
}

.paper-stack-left {
    left: -12px;
    background: linear-gradient(to right, #1a1533, #e2d9f3);
    border-radius: 4px 0 0 4px;
    box-shadow: -2px 0 5px rgba(0,0,0,0.5);
}

.paper-stack-right {
    right: -12px;
    background: linear-gradient(to left, #1a1533, #e2d9f3);
    border-radius: 0 4px 4px 0;
    box-shadow: 2px 0 5px rgba(0,0,0,0.5);
}

.paper-layer {
    position: absolute;
    inset: 0;
    border-right: 1px solid rgba(0,0,0,0.15);
}

/* Back Cover 3D */
.book-cover-back-3d {
    position: absolute;
    inset: -6px -8px -6px -8px;
    background: linear-gradient(135deg, #18112c, #0a0715);
    border: 2px solid var(--card-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.9);
    z-index: 2;
}

/* ==========================================================================
   2. 3D HARDCOVER FRONT COVER (Pivots around Spine Left Edge)
   ========================================================================== */
.book-cover-front-3d {
    position: absolute;
    inset: 0;
    transform-origin: left center; /* SPINE PIVOT AXIS */
    transform-style: preserve-3d;
    transition: transform var(--physics-opening), opacity 0.8s ease 0.8s;
    z-index: 70;
    border-radius: var(--radius-lg);
    cursor: pointer;
}

.cover-front-face {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #241942 0%, #0f0a1c 100%);
    border: 3px solid var(--accent-gold);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.85), inset 0 0 30px rgba(157, 78, 221, 0.2);
    backface-visibility: hidden;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.cover-back-face {
    position: absolute;
    inset: 0;
    background: #140f28;
    border: 2px solid var(--card-border);
    border-radius: var(--radius-lg);
    transform: rotateY(180deg);
    backface-visibility: hidden;
}

.cover-inner-pattern {
    width: 100%;
    height: 100%;
    background-image: radial-gradient(rgba(199, 125, 255, 0.15) 1px, transparent 0);
    background-size: 18px 18px;
}

/* Glossy Sheen Sweep Effect on Hover */
.glossy-reflection-sheen {
    position: absolute;
    inset: 0;
    background: linear-gradient(105deg, transparent 20%, rgba(255, 255, 255, 0.35) 45%, rgba(255, 117, 140, 0.35) 50%, transparent 65%);
    transform: translateX(-100%);
    transition: transform 1.2s cubic-bezier(0.19, 1, 0.22, 1);
    pointer-events: none;
    z-index: 5;
}

.book-cover-front-3d:hover .glossy-reflection-sheen {
    transform: translateX(180%);
}

.cover-emboss-content {
    padding: 3rem 2rem;
    text-align: center;
    z-index: 2;
}

.gold-emboss-border {
    border: 2px dashed rgba(255, 209, 102, 0.4);
    padding: 3rem 2rem;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.02);
}

.magical-seal-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: rotateSlow 20s linear infinite;
}

.cover-main-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.cover-sub-title {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 2.2rem;
}

.cover-gift-anim {
    position: relative;
    width: 110px;
    height: 110px;
    margin: 0 auto 1.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sparkle-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 2px dashed var(--accent-glow);
    animation: rotateSlow 12s linear infinite;
}

.cover-gift-emoji {
    font-size: 3.8rem;
    animation: bounceSoft 2s ease-in-out infinite;
}

.cover-prompt {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 1.8rem;
}

/* ==========================================================================
   3. GLOSSY NEON PINK OPENING BUTTON & TOOLTIPS
   ========================================================================== */
.btn-tooltip-wrapper {
    position: relative;
    display: inline-block;
}

.open-book-btn {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    color: #fff;
    border: 1px solid var(--accent-pink);
    padding: 16px 36px;
    border-radius: 40px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 8px 30px rgba(255, 117, 140, 0.5), inset 0 2px 4px rgba(255, 255, 255, 0.4);
    transition: var(--transition-fast);
}

.open-book-btn:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 12px 40px rgba(255, 117, 140, 0.8), inset 0 2px 6px rgba(255, 255, 255, 0.6);
}

.open-book-btn:active {
    transform: translateY(1px) scale(0.98);
}

/* Glossy Neon Tooltips */
.neon-tooltip {
    position: absolute;
    background: rgba(20, 15, 38, 0.92);
    border: 1px solid var(--accent-pink);
    color: #ffffff;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 600;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transform: translateY(10px) scale(0.9);
    transition: opacity 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 0 20px rgba(255, 117, 140, 0.5), inset 0 0 10px rgba(255, 117, 140, 0.2);
    backdrop-filter: blur(12px);
    z-index: 120;
}

.open-tooltip {
    bottom: -45px;
    left: 50%;
    transform: translateX(-50%) translateY(10px) scale(0.9);
}

.btn-tooltip-wrapper:hover .open-tooltip {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
    animation: floatTooltip 2.5s ease-in-out infinite alternate;
}

.arrow-tooltip-wrapper {
    position: absolute;
    top: 50%;
    z-index: 35;
}

.prev-wrapper {
    left: 0;
}

.next-wrapper {
    right: 0;
}

.arrow-tooltip {
    top: 50%;
}

.prev-wrapper .arrow-tooltip {
    left: 60px;
    transform: translateY(-50%) translateX(-10px) scale(0.9);
}

.next-wrapper .arrow-tooltip {
    right: 60px;
    transform: translateY(-50%) translateX(10px) scale(0.9);
}

.prev-wrapper:hover .arrow-tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(0) scale(1);
}

.next-wrapper:hover .arrow-tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(0) scale(1);
}

@keyframes floatTooltip {
    0% { transform: translateX(-50%) translateY(0); }
    100% { transform: translateX(-50%) translateY(-5px); }
}

/* Physical Cover Opening State */
.book-cover-front-3d.is-open {
    transform: rotateY(-175deg); /* Spine pivoting rotation */
    opacity: 0;
    pointer-events: none;
    display: none !important; /* Hide completely after open so zero overlay occurs */
}

/* ==========================================================================
   4. SEAMLESS UNIFIED 2-PAGE SPREAD (ZERO CENTER CUT / ZERO LINE DIVIDER)
   ========================================================================== */
.book-spread-container {
    position: relative;
    width: 100%;
    min-height: 580px;
    background: radial-gradient(circle at center, rgba(30, 24, 56, 0.96) 0%, rgba(18, 14, 34, 0.98) 100%);
    backdrop-filter: blur(24px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-glow), inset 0 0 50px rgba(0, 0, 0, 0.5);
    overflow: visible; /* ALLOW 3D FLIPPING SHEET TO BREAK OUTSIDE TOP/BOTTOM BOOK BORDER LINES */
    transform-style: preserve-3d;
    z-index: 10;
}

/* Soft Natural Spine Crease Depth (Zero lines, zero borders) */
.center-fold-binding {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.18) 0%, transparent 85%);
    z-index: 20;
    pointer-events: none;
}

/* ==========================================================================
   5. REAL 3D PHYSICAL PAPER PAGE FLIP ENGINE (FAR-LEFT SPINE AXIS PIVOT)
   ========================================================================== */
.flipping-sheet-3d {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0; /* FAR-LEFT SPINE AXIS AS HIGHLIGHTED BY USER */
    width: 100%;
    transform-origin: left center; /* PIVOTS FROM THE FAR-LEFT SPINE (.book-spine-3d) */
    transform-style: preserve-3d;
    will-change: transform; /* GPU Compositor Promotion */
    z-index: 40;
    pointer-events: none;
    display: none;
    visibility: hidden;
}

.flipping-sheet-3d.active-flip-forward {
    display: block !important;
    visibility: visible !important;
    animation: paperFlipForward 0.85s cubic-bezier(0.25, 1, 0.35, 1) forwards;
}

.flipping-sheet-3d.active-flip-backward {
    display: block !important;
    visibility: visible !important;
    animation: paperFlipBackward 0.85s cubic-bezier(0.25, 1, 0.35, 1) forwards;
}

/* Ultra-Realistic 60fps Hand-Lifted 3D Paper Flip Keyframes (Fixed Left Spine Pivot) */
@keyframes paperFlipForward {
    0% {
        transform: rotateY(0deg) translateZ(0px) rotateX(0deg) rotateZ(0deg) scale(1);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }
    35% {
        /* Spine hinge stays anchored at left: 0; top-right paper corner flexes UP into 3D space */
        transform: rotateY(-55deg) translateZ(140px) rotateX(12deg) rotateZ(-4deg) scale(1.03);
        box-shadow: -35px 35px 75px rgba(0, 0, 0, 0.65);
    }
    70% {
        /* Paper arcs across spine smoothly */
        transform: rotateY(-130deg) translateZ(100px) rotateX(-6deg) rotateZ(2deg) scale(1.02);
        box-shadow: 35px 30px 65px rgba(0, 0, 0, 0.6);
    }
    100% {
        /* Paper settles flat */
        transform: rotateY(-180deg) translateZ(0px) rotateX(0deg) rotateZ(0deg) scale(1);
        box-shadow: 5px 0 15px rgba(0, 0, 0, 0.1);
    }
}

@keyframes paperFlipBackward {
    0% {
        transform: rotateY(-180deg) translateZ(0px) rotateX(0deg) rotateZ(0deg) scale(1);
        box-shadow: 5px 0 15px rgba(0, 0, 0, 0.1);
    }
    35% {
        /* Spine hinge stays anchored at left: 0; top-left paper corner flexes UP into 3D space */
        transform: rotateY(-125deg) translateZ(140px) rotateX(12deg) rotateZ(4deg) scale(1.03);
        box-shadow: 35px 35px 75px rgba(0, 0, 0, 0.65);
    }
    70% {
        /* Paper arcs back right smoothly */
        transform: rotateY(-50deg) translateZ(100px) rotateX(-6deg) rotateZ(-2deg) scale(1.02);
        box-shadow: -35px 30px 65px rgba(0, 0, 0, 0.6);
    }
    100% {
        transform: rotateY(0deg) translateZ(0px) rotateX(0deg) rotateZ(0deg) scale(1);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }
}

.sheet-face {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(30, 24, 56, 0.98) 0%, rgba(18, 14, 34, 0.99) 100%);
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.4);
    padding: 3.5rem 3rem;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    transform-style: preserve-3d;
    overflow: hidden;
}

.sheet-front {
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.sheet-back {
    border-radius: var(--radius-lg);
    transform: rotateY(180deg);
    background: radial-gradient(circle at center, rgba(25, 19, 46, 0.99) 0%, rgba(12, 9, 24, 0.99) 100%);
    box-shadow: inset 0 0 50px rgba(0, 0, 0, 0.6);
}

.blank-paper-back {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.25;
    pointer-events: none;
}

.paper-watermark {
    font-size: 4rem;
    animation: rotateSlow 20s linear infinite;
}

.sheet-content-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    pointer-events: none;
    user-select: none;
}

.sheet-content-wrapper * {
    max-width: 100%;
}

.sheet-crease-shadow {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at left, rgba(0, 0, 0, 0.3) 0%, transparent 70%);
    opacity: 0;
    pointer-events: none;
}

/* Side Navigation Arrows */
.page-side-arrow {
    width: 48px;
    height: 66px;
    background: rgba(26, 21, 48, 0.85);
    border: 1px solid var(--accent-pink);
    color: var(--accent-gold);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    cursor: pointer;
    transition: var(--transition-fast);
    backdrop-filter: blur(10px);
    box-shadow: 0 0 15px rgba(255, 117, 140, 0.3);
}

.prev-side-arrow {
    border-radius: 0 16px 16px 0;
    border-left: none;
}

.next-side-arrow {
    border-radius: 16px 0 0 16px;
    border-right: none;
}

.page-side-arrow:hover {
    background: rgba(157, 78, 221, 0.5);
    color: #fff;
    width: 56px;
    box-shadow: 0 0 25px rgba(255, 117, 140, 0.6);
}

.page-side-arrow.disabled {
    opacity: 0.2;
    pointer-events: none;
}

/* ==========================================================================
   6. TWO-PAGE SPREAD LAYOUT & CHAPTER STYLES
   ========================================================================== */
.spread-pages-wrapper {
    position: relative;
    width: 100%;
    min-height: 580px;
}

.page-chapter {
    display: none;
    padding: 3.5rem 3.5rem;
    min-height: 520px;
    opacity: 0;
    transform: scale(0.98);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.page-chapter.active {
    display: block;
    opacity: 1;
    transform: scale(1);
}

/* Clean 2-Page Layout Container */
.spread-two-pages {
    display: flex;
    width: 100%;
    min-height: 480px;
    gap: 3rem;
    align-items: flex-start;
}

.page-half {
    flex: 1;
    width: 50%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.page-left {
    padding-right: 1rem;
}

.page-right {
    padding-left: 1rem;
}

.chapter-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--accent-glow);
    margin-bottom: 1rem;
    width: fit-content;
}

.glow-badge {
    background: linear-gradient(135deg, rgba(255, 209, 102, 0.2), rgba(255, 117, 140, 0.2));
    color: var(--accent-gold);
    border-color: var(--accent-gold);
    box-shadow: 0 0 15px rgba(255, 209, 102, 0.3);
}

.chapter-heading {
    font-family: var(--font-heading);
    font-size: 2.1rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    background: linear-gradient(135deg, #ffffff 30%, var(--accent-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.3;
}

.paragraph {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.magical-quote {
    font-family: var(--font-cursive);
    font-size: 2rem;
    color: var(--accent-gold);
    border-left: 3px solid var(--accent-purple);
    padding-left: 1.2rem;
    margin: 1.5rem 0;
    line-height: 1.3;
}

.welcome-illustration {
    text-align: center;
    font-size: 4rem;
    margin: 1rem 0;
}

.floating-magic-box {
    animation: bounceSoft 2.5s ease-in-out infinite;
}

.action-center {
    margin-top: 1.5rem;
}

.turn-page-btn, .action-btn {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    color: #fff;
    border: none;
    padding: 12px 28px;
    border-radius: 30px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: 0 4px 20px rgba(157, 78, 221, 0.4);
    width: fit-content;
}

.turn-page-btn:hover, .action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(157, 78, 221, 0.6);
}

/* GIFT JOURNEY STYLES */
.journey-main-title {
    font-family: var(--font-cursive);
    font-size: 2.8rem;
    color: var(--accent-gold);
    line-height: 1.2;
    text-shadow: 0 0 15px rgba(255, 209, 102, 0.4);
}

.journey-sub-headline {
    font-size: 1.02rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
    margin-bottom: 1.2rem;
}

.secret-mode-overlay {
    background: rgba(14, 11, 28, 0.95);
    border: 1px solid var(--accent-pink);
    border-radius: var(--radius-md);
    padding: 2rem 1.5rem;
    text-align: center;
    margin: 1rem 0;
    box-shadow: 0 0 30px rgba(255, 117, 140, 0.2);
}

.secret-mode-overlay.hidden {
    display: none;
}

.secret-icon-anim {
    font-size: 3rem;
    margin-bottom: 0.8rem;
    animation: pulse 1.5s infinite alternate;
}

.glow-btn {
    margin-top: 1rem;
    background: linear-gradient(135deg, var(--accent-pink), var(--accent-gold));
    color: #0a0814;
    font-weight: 700;
}

.countdown-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 1rem 1.2rem;
    margin-bottom: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.countdown-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-main);
}

.countdown-timer {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.time-block {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 4px 8px;
    border-radius: 6px;
    text-align: center;
    min-width: 42px;
}

.time-block span {
    display: block;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-gold);
}

.time-block label {
    font-size: 0.6rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.time-colon {
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent-glow);
}

.delivered-message {
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent-gold);
    animation: glowPulse 2s infinite alternate;
}

/* MINIATURE ROUTE MAP */
.mini-map-container {
    position: relative;
    height: 180px;
    background: radial-gradient(circle at center, #1b1633 0%, #100d21 100%);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 1.2rem;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.6);
}

.map-grid-bg {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(199, 125, 255, 0.15) 1px, transparent 0);
    background-size: 24px 24px;
    pointer-events: none;
}

#routeCanvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.map-checkpoints-layer {
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
}

.map-node {
    position: absolute;
    transform: translate(-50%, -50%);
}

.node-pin {
    width: 32px;
    height: 32px;
    background: rgba(20, 16, 38, 0.9);
    border: 2px solid var(--card-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
    transition: var(--transition-fast);
}

.map-node.completed .node-pin {
    border-color: var(--accent-glow);
    box-shadow: 0 0 12px var(--accent-glow);
}

.map-node.active .node-pin {
    border-color: var(--accent-gold);
    background: var(--accent-purple);
    transform: scale(1.15);
    box-shadow: 0 0 15px var(--accent-gold);
}

/* 3D RUNNER */
.package-3d-runner {
    position: absolute;
    top: 50%;
    left: 10%;
    transform: translate(-50%, -50%);
    z-index: 3;
    transition: left 0.8s cubic-bezier(0.34, 1.56, 0.64, 1), top 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
}

.package-box-inner {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #ff758c, #7b2cbf);
    border: 2px solid #ffd166;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 20px rgba(255, 117, 140, 0.6);
    animation: floatTilt 3s ease-in-out infinite;
}

.runner-icon {
    font-size: 1.2rem;
}

.package-shadow {
    position: absolute;
    bottom: -8px;
    left: 10%;
    width: 80%;
    height: 6px;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 50%;
    filter: blur(3px);
}

/* TRACKING DETAILS INFO */
.info-details-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-top: 1rem;
}

.info-group {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.info-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
}

.info-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
}

.info-value.highlight-val {
    color: var(--accent-gold);
}

.info-value.code-font {
    font-family: monospace;
    font-size: 0.95rem;
}

.tracking-num-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.copy-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--card-border);
    color: var(--text-main);
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
}

.status-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    background: rgba(76, 201, 240, 0.15);
    color: var(--accent-cyan);
    border: 1px solid var(--accent-cyan);
    font-size: 0.8rem;
    width: fit-content;
}

/* TIMELINE */
.timeline-container {
    margin-top: 1rem;
}

.timeline-title {
    font-family: var(--font-heading);
    font-size: 1rem;
    margin-bottom: 0.8rem;
    color: var(--text-main);
}

.timeline-list {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    position: relative;
    padding-left: 1.5rem;
}

.timeline-list::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: rgba(255, 255, 255, 0.1);
}

.timeline-item {
    position: relative;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 0.8rem 1rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -1.5rem;
    top: 1rem;
    transform: translateX(-50%);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 2px solid var(--text-muted);
}

.timeline-item.completed::before {
    background: var(--accent-purple);
    border-color: var(--accent-glow);
}

.timeline-item.active {
    background: rgba(157, 78, 221, 0.15);
    border-color: var(--accent-gold);
}

.timeline-item.active::before {
    background: var(--accent-gold);
    border-color: var(--accent-gold);
}

.tl-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.2rem;
}

.tl-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
}

.tl-time {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.tl-sub {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.tl-loc {
    font-size: 0.75rem;
    color: var(--accent-cyan);
}

/* OTHER CHAPTERS */
.memory-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 1.2rem;
    transition: var(--transition-fast);
}

.memory-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent-glow);
}

.memory-icon {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

.memory-card h3 {
    font-family: var(--font-heading);
    font-size: 1rem;
    margin-bottom: 0.4rem;
    color: var(--accent-gold);
}

.memory-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.tulip-canvas-container {
    position: relative;
    height: 300px;
    background: rgba(14, 11, 28, 0.8);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

#tulipCanvas {
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.garden-overlay-text {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.6);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--text-muted);
    pointer-events: none;
}

.cake-interactive-area {
    text-align: center;
    padding: 1rem;
}

.cake-visual {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    cursor: pointer;
}

.candle-flame {
    font-size: 2rem;
    margin-bottom: -10px;
    animation: flameFlicker 0.4s infinite alternate;
}

.candle-flame.blown-out {
    display: none;
}

.candle {
    font-size: 1.6rem;
    margin-bottom: -12px;
}

.cake-emoji {
    font-size: 4.8rem;
}

.wish-toast {
    margin-top: 1.2rem;
    font-family: var(--font-cursive);
    font-size: 1.8rem;
    color: var(--accent-gold);
    animation: glowPulse 2s infinite alternate;
}

.letter-container {
    background: linear-gradient(135deg, #1f1a3a, #151128);
    border: 1px solid var(--accent-gold);
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.4);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.letter-heading {
    font-family: var(--font-cursive);
    font-size: 2.2rem;
    color: var(--accent-gold);
    margin-bottom: 1rem;
}

.letter-body {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-main);
}

.letter-closing {
    font-family: var(--font-cursive);
    font-size: 2rem;
    color: var(--accent-pink);
    text-align: right;
    margin-top: 1.5rem;
}

.final-card {
    text-align: center;
}

.big-gift-icon {
    font-size: 4.5rem;
    text-align: center;
    animation: bounceSoft 2s ease-in-out infinite;
}

.celebrate-big-btn {
    font-size: 1.05rem;
    padding: 14px 32px;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-pink));
    color: #0a0814;
    font-weight: 700;
}

/* BOOK FOOTER BAR */
.book-footer-bar {
    position: absolute;
    bottom: 12px;
    left: 0;
    right: 0;
    text-align: center;
    pointer-events: none;
    z-index: 15;
}

.book-page-counter {
    font-size: 0.8rem;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.4);
    padding: 4px 12px;
    border-radius: 20px;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: rgba(26, 21, 48, 0.95);
    border: 1px solid var(--accent-glow);
    color: #fff;
    padding: 10px 18px;
    border-radius: 10px;
    font-size: 0.88rem;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
    animation: slideIn 0.3s ease forwards;
}

/* Keyframes */
@keyframes rotateSlow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes bounceSoft {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(1.1); opacity: 1; }
}

@keyframes glowPulse {
    0% { text-shadow: 0 0 8px var(--accent-gold); }
    100% { text-shadow: 0 0 20px var(--accent-gold), 0 0 30px var(--accent-pink); }
}

@keyframes floatTilt {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-8px) rotate(4deg); }
}

@keyframes flameFlicker {
    0% { transform: scale(1) rotate(-2deg); opacity: 0.9; }
    100% { transform: scale(1.15) rotate(2deg); opacity: 1; }
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.hidden {
    display: none !important;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .spread-two-pages {
        flex-direction: column;
        gap: 1.5rem;
    }
    .page-half {
        width: 100%;
        padding: 0 !important;
    }
    .book-stage {
        margin: 15px auto;
        min-height: 500px;
    }
    .book-3d-object {
        transform: rotateX(0deg) rotateY(0deg) !important;
    }
    .page-chapter {
        padding: 2rem 1.5rem;
    }
    .cover-main-title {
        font-size: 2rem;
    }
    .journey-main-title {
        font-size: 2.2rem;
    }
    .cake-emoji {
        font-size: 7rem;
    }
    .candle {
        font-size: 3rem;
        margin-bottom: -20px;
    }
    .candle-flame {
        font-size: 2.5rem;
        margin-bottom: -12px;
    }
}

.tracking-num-wrapper {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.copy-btn, .edit-tracking-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    padding: 2px 8px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
    color: #fff;
}

.copy-btn:hover, .edit-tracking-btn:hover {
    background: rgba(255, 215, 0, 0.2);
    border-color: rgba(255, 215, 0, 0.4);
    transform: translateY(-1px);
}

/* ==========================================================================
   CHAPTER 5: BIRTHDAY CAKE & CANDLE (GRAND SIZE & INTERACTIVE GLOW)
   ========================================================================== */
.cake-interactive-area {
    width: 100%;
    height: 100%;
    min-height: 380px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
}

.cake-visual {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 2rem;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    user-select: none;
}

.cake-visual:hover {
    transform: scale(1.12) translateY(-6px);
}

.cake-visual::before {
    content: '';
    position: absolute;
    bottom: 5px;
    width: 250px;
    height: 60px;
    background: radial-gradient(ellipse at center, rgba(255, 182, 193, 0.45) 0%, rgba(255, 215, 0, 0.25) 40%, transparent 75%);
    border-radius: 50%;
    z-index: 0;
    pointer-events: none;
    animation: cakePlateGlow 3s infinite alternate ease-in-out;
}

@keyframes cakePlateGlow {
    0% { transform: scale(0.9); opacity: 0.7; }
    100% { transform: scale(1.15); opacity: 1; filter: drop-shadow(0 0 20px rgba(255, 105, 180, 0.6)); }
}

.candle-flame {
    font-size: 4rem;
    line-height: 1;
    margin-bottom: -18px;
    z-index: 3;
    filter: drop-shadow(0 0 15px #ffaa00) drop-shadow(0 0 30px #ff5500);
    animation: flameFlicker 1.2s infinite ease-in-out alternate;
    transition: all 0.5s ease;
    position: relative;
}

@keyframes flameFlicker {
    0% { transform: scale(1) rotate(-2deg); filter: drop-shadow(0 0 12px #ffaa00) drop-shadow(0 0 25px #ff4400); }
    50% { transform: scale(1.2) rotate(3deg); filter: drop-shadow(0 0 22px #ffcc00) drop-shadow(0 0 35px #ff6600); }
    100% { transform: scale(0.95) rotate(-1deg); filter: drop-shadow(0 0 14px #ff8800) drop-shadow(0 0 25px #ff2200); }
}

.candle-flame.blown-out {
    opacity: 0.15;
    transform: scale(0.3) translateY(-25px);
    filter: grayscale(1) blur(3px);
    animation: none;
}

.candle-flame.blown-out::after {
    content: '💨';
    font-size: 3rem;
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.9;
    animation: smokeRise 1.6s forwards ease-out;
}

@keyframes smokeRise {
    0% { opacity: 1; transform: translate(-50%, 0) scale(0.7); }
    100% { opacity: 0; transform: translate(-50%, -50px) scale(2); }
}

.candle {
    font-size: 4.5rem;
    line-height: 1;
    margin-bottom: -30px;
    z-index: 2;
    filter: drop-shadow(0 3px 6px rgba(0, 0, 0, 0.4));
}

.cake-emoji {
    font-size: 11rem;
    line-height: 1;
    z-index: 1;
    filter: drop-shadow(0 20px 30px rgba(0, 0, 0, 0.45)) drop-shadow(0 0 40px rgba(255, 182, 193, 0.35));
    transition: transform 0.2s ease;
}

/* ==========================================================================
   DYNAMIC PHOTO ROLLER SHOWCASE & FILM REEL MODAL
   ========================================================================== */
.photo-roller-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(10, 8, 20, 0.85);
    backdrop-filter: blur(16px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 1;
    transition: opacity 0.4s ease;
}

.photo-roller-modal {
    background: radial-gradient(circle at center, rgba(28, 22, 54, 0.96) 0%, rgba(14, 11, 28, 0.98) 100%);
    border: 1px solid rgba(255, 215, 0, 0.3);
    border-radius: var(--radius-lg);
    box-shadow: 0 25px 70px rgba(0, 0, 0, 0.7), 0 0 40px rgba(157, 78, 221, 0.3);
    width: 100%;
    max-width: 950px;
    padding: 1.8rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    transform: scale(1);
    animation: modalPopIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalPopIn {
    0% { transform: scale(0.85) translateY(20px); opacity: 0; }
    100% { transform: scale(1) translateY(0); opacity: 1; }
}

.photo-roller-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 1rem;
}

.photo-roller-title {
    display: flex;
    align-items: center;
    gap: 10px;
}

.roller-icon {
    font-size: 1.8rem;
}

.photo-roller-title h3 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    color: var(--accent-gold);
    text-shadow: 0 0 10px rgba(255, 209, 102, 0.3);
}

.photo-roller-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.roller-action-btn {
    background: rgba(255, 215, 0, 0.15);
    border: 1px solid rgba(255, 215, 0, 0.35);
    color: var(--accent-gold);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.roller-action-btn:hover {
    background: rgba(255, 215, 0, 0.3);
    transform: scale(1.05);
}

.close-roller-btn, .close-lightbox-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s ease;
}

.close-roller-btn:hover, .close-lightbox-btn:hover {
    background: rgba(255, 77, 109, 0.4);
    border-color: rgba(255, 77, 109, 0.6);
    transform: rotate(90deg);
}

/* Film Strip Roller Track */
.film-strip-container {
    position: relative;
    width: 100%;
    overflow: hidden;
    background: #080610;
    border-radius: 14px;
    border: 2px solid rgba(255, 255, 255, 0.12);
    padding: 18px 0;
    box-shadow: inset 0 0 25px rgba(0, 0, 0, 0.8);
}

.film-strip-track {
    display: flex;
    align-items: center;
    gap: 20px;
    width: max-content;
    animation: filmReelScroll 24s linear infinite;
    padding: 0 10px;
}

.film-strip-container:hover .film-strip-track {
    animation-play-state: paused;
}

@keyframes filmReelScroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.photo-film-card {
    flex-shrink: 0;
    width: 210px;
    background: #ffffff;
    padding: 10px 10px 14px 10px;
    border-radius: 6px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5), 0 0 15px rgba(255, 255, 255, 0.1);
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.photo-film-card:hover {
    transform: scale(1.08) rotate(0deg) translateY(-8px) !important;
    z-index: 10;
    box-shadow: 0 18px 35px rgba(255, 209, 102, 0.35), 0 0 20px rgba(255, 255, 255, 0.5);
}

.photo-film-img-box {
    width: 100%;
    height: 160px;
    overflow: hidden;
    border-radius: 4px;
    background: #111;
}

.photo-film-img-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.photo-film-card:hover .photo-film-img-box img {
    transform: scale(1.1);
}

.photo-film-caption {
    font-family: var(--font-cursive);
    font-size: 1.15rem;
    color: #222;
    text-align: center;
    margin-top: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.photo-roller-hint {
    font-size: 0.82rem;
    color: var(--text-muted);
    text-align: center;
}

/* Lightbox Full Preview */
.photo-lightbox-overlay {
    position: fixed;
    inset: 0;
    z-index: 1100;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.photo-lightbox-card {
    position: relative;
    max-width: 90vw;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.photo-lightbox-card img {
    max-width: 85vw;
    max-height: 75vh;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 0 40px rgba(255, 215, 0, 0.4);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.lightbox-caption {
    font-family: var(--font-heading);
    color: var(--accent-gold);
    font-size: 1.2rem;
}