/* --- Global Styles & Setup --- */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@700&family=Nunito+Sans:wght@400;600&display=swap');

:root {
    --bg-color-1: #e0c3fc;
    --bg-color-2: #8ec5fc;
    --bg-color-3: #f0c3fc;
    --bg-color-4: #c3e8fc;
    --text-dark: #333;
    --text-light: #fff;
    --accent-gold: #FFD700;
    --accent-deep-purple: #5a189a;
    --book-cover-color: #7b2cbf;
    --book-page-color: #f8f7f2;
    --shadow-color: rgba(0, 0, 0, 0.2);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Nunito Sans', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    color: var(--text-dark);
}

.background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, var(--bg-color-1), var(--bg-color-2), var(--bg-color-3), var(--bg-color-4));
    background-size: 400% 400%;
    animation: gradientShift 20s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.step {
    display: none;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
}

.step.active { display: flex; opacity: 1; }

.instruction-text {
    margin-top: 25px;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-light);
    text-shadow: 1px 1px 3px var(--shadow-color);
    animation: fadeIn 1s 0.5s both;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }


/* --- Step 1: Gift Box --- */
.gift-container { text-align: center; cursor: pointer; }
.gift-box { position: relative; width: 150px; height: 150px; background-color: var(--accent-deep-purple); border-radius: 12px; }
.gift-lid {
    position: absolute;
    width: 170px;
    height: 40px;
    background-color: #9d4edd;
    top: -20px;
    left: -10px;
    border-radius: 8px;
    transition: transform 0.5s ease-out;
}
.gift-bow::before, .gift-bow::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 60px;
    background-color: var(--accent-gold);
    border-radius: 50%;
    top: -45px;
    z-index: 10;
}
.gift-bow::before { left: 55px; transform: rotate(-45deg); }
.gift-bow::after { left: 80px; transform: rotate(45deg); }
.gift-container.open .gift-lid { transform: translateY(-80px) rotate(15deg); }

/* --- Step 2: Key --- */
.key-container { text-align: center; }
.key-svg { width: 150px; height: 150px; stroke: var(--accent-gold); filter: drop-shadow(0 0 10px gold); }
#animatedKey {
    stroke-dasharray: 500;
    stroke-dashoffset: 500;
    animation: drawKey 2s ease-out forwards;
    transition: transform 0.5s ease-in-out;
}
@keyframes drawKey { to { stroke-dashoffset: 0; } }
.key-container.unlocking #animatedKey {
    transform: translateY(100px) scale(0.2) rotate(-90deg);
    opacity: 0;
}


/* --- Step 3 & 4: Storybook (FIX APPLIED HERE) --- */
.storybook-container { perspective: 1500px; }
.book {
    width: 400px;
    height: 300px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 1s ease-in-out;
    opacity: 0;
    transform: rotateY(-30deg) scale(0.5);
}
.storybook-container.visible .book { opacity: 1; transform: rotateY(-30deg) scale(1); }
.storybook-container.opening .book { transform: rotateY(0deg) scale(1.2); }

.book-cover, .page {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    transform-style: preserve-3d; /* Apply to all 3D objects */
}

.book-cover {
    transform-origin: left;
    transition: transform 1s cubic-bezier(0.65, 0, 0.35, 1);
    z-index: 10;
}
.cover-front, .cover-back {
    width: 100%;
    height: 100%;
    position: absolute;
    background-color: var(--book-cover-color);
    border-radius: 5px;
    backface-visibility: hidden; /* Hide when facing away */
}
.cover-front {
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 5px 20px var(--shadow-color);
}
.book-title {
    font-family: 'Playfair Display', serif;
    color: var(--accent-gold);
    font-size: 2.5rem;
    border: 2px solid var(--accent-gold);
    padding: 10px 20px;
    border-radius: 5px;
}
.cover-back {
    transform: rotateY(180deg); /* Pre-flip the back */
}
.storybook-container.open .book-cover { transform: rotateY(-180deg); }

.page {
    transform-origin: left;
    transition: transform 1.2s ease-in-out;
    background-color: var(--book-page-color);
    border-radius: 0 5px 5px 0;
    box-shadow: inset -1px 0 2px rgba(0,0,0,0.1);
}
#page1 { z-index: 8; }
#page2 { z-index: 7; }

.page-front, .page-back {
    position: absolute;
    width: 100%;
    height: 100%;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--book-page-color); /* Ensure background is set here */
    border-radius: 0 5px 5px 0;
    backface-visibility: hidden; /* **FIX**: Hide when facing away */
}

.page-back {
    transform: rotateY(180deg); /* **FIX**: Pre-flip the back of the page */
}

.page-text {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    text-align: center;
}

.page.flipped {
    transform: rotateY(-180deg); /* The main flipping animation */
}


/* --- Step 5: Finale --- */
.finale-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.finale-card {
    position: relative;
    text-align: center;
    padding: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 10px 30px var(--shadow-color);
    width: 90%;
    max-width: 600px;
    opacity: 0;
    animation: fadeIn 1s 1s forwards;
}
.finale-greeting {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    color: var(--accent-deep-purple);
}
.finale-name {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: 4rem;
    color: var(--accent-deep-purple);
    margin: 10px 0;
}
.finale-wish {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-top: 20px;
}

/* Floral SVG Animation */
.floral-svg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: visible;
}
.floral-svg path {
    fill: none;
    stroke: var(--accent-deep-purple);
    stroke-width: 2;
    stroke-linecap: round;
    opacity: 0.3;
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: drawVines 3s ease-out 1.5s forwards;
}
@keyframes drawVines { to { stroke-dashoffset: 0; } }


/* --- Responsive Design --- */
@media (max-width: 768px) {
    .book { transform: scale(0.8) rotateY(-30deg); }
    .storybook-container.opening .book { transform: rotateY(0deg) scale(0.9); }
    .finale-greeting { font-size: 2rem; }
    .finale-name { font-size: 3rem; }
    .finale-wish { font-size: 1rem; }
}

@media (max-width: 480px) {
    .book { width: 300px; height: 225px; }
    .book-title { font-size: 1.8rem; }
    .page-text { font-size: 1.1rem; }
    .finale-greeting { font-size: 1.8rem; }
    .finale-name { font-size: 2.5rem; }
    .finale-wish { font-size: 0.9rem; }
    .finale-card { padding: 25px; }
}