/* Carta de Graduación - Estilo Minimalista y Elegante */
:root {
    --bg-black: #0A0A0A;
    --purple-vibrant: #9B59B6;
    --purple-light: #BB8FCE;
    --text-light: #E8E8E8;
    --text-muted: #B0B0B0;
}

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

html, body {
    height: 100%;
    /* Permitimos que el contenido interno maneje su propio scroll (card-page en móvil) */
    overflow: hidden;
}

body {
    /* Propiedades básicas de fuente y color de texto */
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-light);

    /* Propiedades de centrado y posición */
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    /* Evita que el body tenga su propio fondo para que ::before pueda manejarlo */
    background: none; 
}

/* Overlay oscuro con el gradiente de círculo morado */
body::before {
    content: '';
    position: fixed;
    inset: 0; 
    
    /* 1. Capa Superior (Círculo Morado) */
    /* Crea un gradiente circular morado claro semi-transparente */
    background-image: 
        radial-gradient(circle at top , 
                        rgba(155, 89, 182, 0.4) 0%, /* Morado claro, 40% opacidad */
                        transparent 45%), 
        
    /* 2. Capa Intermedia (Oscurecimiento Global) */
    /* Capa negra semi-transparente para oscurecer todo (incluyendo la imagen) */
        linear-gradient(rgba(5, 5, 10, 0.7), rgba(5, 5, 10, 0.7)),
        
    /* 3. Capa Inferior (La Imagen de Fondo) */
        url('assets/walppaper.jpg'); 

    /* Configuración de las imágenes de fondo */
    background-size: cover, cover, cover; /* Cada capa debe tener su propio size si es necesario */
    background-position: center, center, center;
    background-repeat: no-repeat;
    background-attachment: fixed; 
    
    z-index: -1; /* Mueve el overlay detrás del contenido del body */
    pointer-events: none; /* Asegura que el overlay no interfiera con clics */
}

/* Canvas para partículas */
#particlesCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    pointer-events: none;
}

/* Contenedor principal */
.card-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    z-index: 1;
}

/* Panel central (libro) */
.panel {
    position: relative;
    z-index: 2;
    width: min(1200px, 94vw);
    height: min(760px, 86vh);
    border-radius: 20px;
    background: linear-gradient(180deg, rgba(10, 10, 10, 0.95), rgba(15, 10, 20, 0.98));
    box-shadow: 
        0 50px 100px rgba(0, 0, 0, 0.8),
        inset 0 1px 0 rgba(155, 89, 182, 0.1),
        0 0 0 1px rgba(155, 89, 182, 0.2);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: scale(0.8);
    opacity: 0;
    transition: transform 1000ms cubic-bezier(0.34, 1.56, 0.64, 1), 
                opacity 800ms ease;
    backdrop-filter: blur(10px);
}

.panel.entered {
    transform: scale(1);
    opacity: 1;
}

/* Slides area */
.slides {
    position: relative;
    width: 100%;
    height: 100%;
}

/* Cada página del libro */
.card-page {
    position: absolute;
    inset: 0;
    padding: 48px 64px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: radial-gradient(circle at top, rgba(25, 15, 45, 0.98) 0, rgba(10, 7, 20, 0.98) 45%, rgba(6, 4, 12, 0.98) 100%);
    transition: transform 700ms cubic-bezier(0.2, 0.9, 0.2, 1), 
                opacity 600ms ease;
    transform: translateX(120%);
    opacity: 0;
    z-index: 1;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

.card-page.active {
    transform: translateX(0);
    opacity: 1;
    z-index: 3;
}

.card-page.left {
    transform: translateX(-120%);
    opacity: 0;
}

.card-page.right {
    transform: translateX(120%);
    opacity: 0;
}

.page-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.card-page::-webkit-scrollbar {
    width: 6px;
}

.card-page::-webkit-scrollbar-thumb {
    background: rgba(155, 89, 182, 0.4);
    border-radius: 999px;
}

.page-title {
    font-size: clamp(1.6rem, 3vw, 2.5rem);
    font-weight: 800;
    color: var(--purple-vibrant);
    margin-bottom: 12px;
    text-align: center;
    letter-spacing: 0.5px;
    border-bottom: 2px solid rgba(155, 89, 182, 0.3);
    padding-bottom: 12px;
    text-shadow: 0 2px 10px rgba(155, 89, 182, 0.3);
    text-wrap: balance;
    word-break: normal;
}

.page-subtitle {
    font-size: clamp(1rem, 2.2vw, 1.25rem);
    font-style: italic;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 24px;
}

.card-body {
    display: flex;
    gap: 32px;
    align-items: center;
    width: 100%;
    flex: 1;
}

.image-container {
    width: 400px;
    height: 320px;
    border-radius: 16px;
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--purple-vibrant), var(--purple-light));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 
        0 30px 60px rgba(155, 89, 182, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(155, 89, 182, 0.4);
    overflow: hidden;
    position: relative;
}

.image-container::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(155, 89, 182, 0.1), rgba(187, 143, 206, 0.1));
    z-index: 1;
    pointer-events: none;
}

.page-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    position: relative;
    z-index: 0;
    filter: brightness(1.05) contrast(1.1);
}

/* Oscurecer un poco la primera imagen (kiss.jpg, página 0) para que no deslumbre */
.card-page[data-index="0"] .page-image {
    filter: brightness(0.7) contrast(1.1);
}

.card-text {
    flex: 1;
    color: var(--text-light);
    line-height: 1.85;
    font-size: clamp(1rem, 2vw, 1.15rem);
    word-break: break-word;
}

.typewriter-container {
    width: 100%;
}

.typewriter-text {
    margin-bottom: 20px;
    min-height: 1.5em;
    opacity: 0;
}

.typewriter-text.final-message {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--purple-light);
    text-align: center;
    margin-top: 24px;
    font-style: italic;
    text-shadow: 0 2px 8px rgba(155, 89, 182, 0.4);
}

.page-footer {
    text-align: right;
    font-size: 0.875rem;
    color: var(--purple-vibrant);
    padding-top: 16px;
    border-top: 1px solid rgba(155, 89, 182, 0.2);
}

.page-footer.signature {
    border-top: none;
    padding-top: 24px;
    text-align: center;
}

.signature-text {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.highlight {
    /* Eliminada por no usarse */
}

.signature-date {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Botones de navegación */
.nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    z-index: 5;
    background: linear-gradient(180deg, var(--purple-vibrant), var(--purple-light));
    box-shadow: 0 12px 30px rgba(155, 89, 182, 0.4);
    transition: transform 200ms ease, box-shadow 200ms ease;
}

.nav-btn:hover {
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 16px 40px rgba(155, 89, 182, 0.5);
}

.nav-btn.left {
    left: 4%;
}

.nav-btn.right {
    right: 4%;
}

.nav-btn svg {
    width: 24px;
    height: 24px;
    color: white;
}

/* Paginación */
.pager {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 28px;
    display: flex;
    gap: 12px;
    z-index: 20;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(155, 89, 182, 0.3);
    cursor: pointer;
    transition: all 300ms ease;
}

.dot.active {
    background: var(--purple-vibrant);
    box-shadow: 0 0 20px rgba(155, 89, 182, 0.6);
    transform: scale(1.3);
}

/* Intro overlay */
#introOverlay {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    transition: opacity 800ms ease, transform 800ms ease;
}

.intro-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    color: var(--text-light);
    margin-bottom: 35px;
}

.intro-text .emoji {
    font-size: 3.5rem;
    filter: drop-shadow(0 6px 20px rgba(155, 89, 182, 0.4));
    animation: pulse 2s ease-in-out infinite;
}

.intro-text .press {
    font-weight: 700;
    letter-spacing: 1px;
    font-size: 1.25rem;
    color: var(--purple-light);
    /* animation: pulse 2s ease-in-out infinite; */
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.05); }
}

.gift-btn {
    width: 140px;
    height: 140px;
    border-radius: 20px;
    background: linear-gradient(180deg, var(--purple-vibrant), var(--purple-light));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 
        0 30px 90px rgba(155, 89, 182, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    cursor: pointer;
    border: none;
    animation: giftFloat 2.5s ease-in-out infinite;
    transition: transform 300ms ease;
}

.gift-btn:hover {
    transform: translateY(-8px) scale(1.05);
}

.gift-btn.clicking {
    animation: giftClick 1.2s ease-in-out;
}

@keyframes giftFloat {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-12px) scale(1.02); }
}

@keyframes giftClick {
    0% { transform: scale(1) rotate(0deg); }
    30% { transform: scale(1.5) rotate(-10deg); }
    60% { transform: scale(1.3) rotate(10deg); }
    100% { transform: scale(0) rotate(180deg); opacity: 0; }
}

.gift-icon {
    width: 70px;
    height: 70px;
    color: white;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
}

.intro-hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.95);
}

/* Responsive */
@media (max-width: 900px) {
    .panel {
        width: 96vw;
        height: 92vh;
    }

    .card-page {
        padding: 32px 36px 40px;
    }

    .card-body {
        flex-direction: column;
        gap: 24px;
    }

    .image-container {
        width: 300px;
        height: 220px;
    }

    .page-title {
        font-size: 2rem;
    }

    .card-text {
        font-size: 1rem;
    }
}

@media (max-width: 640px) {
    .card-container {
        padding: 8px 0;
    }

    .panel {
        width: 100vw;
        height: 100vh;
        border-radius: 0;
    }

    .card-page {
        padding: 20px 18px 36px;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .page-content {
        gap: 18px;
    }

    .image-container {
        width: 100%;
        height: 200px;
    }

    .page-title {
        font-size: 1.4rem;
    }

    .card-text {
        font-size: 0.95rem;
        line-height: 1.6;
    }

    .nav-btn {
        width: 48px;
        height: 48px;
        top: auto;
        bottom: 72px;
        transform: none;
    }

    .nav-btn.left {
        left: 16px;
    }

    .nav-btn.right {
        right: 16px;
    }

    .pager {
        bottom: 16px;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .card-page {
        padding: 18px 16px 32px;
    }

    .page-title {
        font-size: 1.3rem;
    }

    .image-container {
        height: 180px;
    }

    .card-text {
        font-size: 0.92rem;
        line-height: 1.55;
    }

    .nav-btn {
        width: 44px;
        height: 44px;
        bottom: 64px;
    }

    .pager {
        bottom: 12px;
    }

    .dot {
        width: 10px;
        height: 10px;
    }
}