:root {
    --font-display: 'Press Start 2P', cursive;
    --font-body: 'Roboto', sans-serif;
    --bg-overlay: linear-gradient(120deg, rgba(10, 12, 52, 0.8), rgba(203, 134, 214, 0.6));
    --bg-overlay-alt: linear-gradient(120deg, rgba(28, 19, 84, 0.85), rgba(156, 216, 255, 0.5));
    --btn-gradient: linear-gradient(90deg, #ff9a3d, #ff6ad5, #8d7dff);
    --transition: 0.6s ease;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font-body);
    color: #fff;
    min-height: 100vh;
}

.game {
    position: relative;
    min-height: 100vh;
    overflow: hidden;
}

.slide {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: clamp(2rem, 5vw, 3.5rem);
    text-align: center;
    transition: opacity var(--transition), transform var(--transition);
    opacity: 0;
    transform: scale(1.05);
    pointer-events: none;
    overflow-y: auto;  /* allow vertical scroll */
    overflow-x: hidden; /* prevent horizontal scroll */
}

.slide.is-active {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}

.slide--intro {
    background: var(--bg-overlay-alt),
        url('https://images.unsplash.com/photo-1500530855697-b586d89ba3ee?auto=format&fit=crop&w=1600&q=80') center/cover no-repeat fixed;
}

/* Move intro content closer to logo */
.slide--intro {
    justify-content: flex-start;
}
.slide--intro .slide__content {
    margin-top: clamp(1rem, 8vh, 3rem);
}

.slide--world {
    background: var(--bg-overlay),
        url('https://images.unsplash.com/photo-1521295121783-8a321d551ad2?auto=format&fit=crop&w=1600&q=80') center/cover no-repeat fixed;
}
/* Center content on worlds page while keeping header logo top-left */
.slide--world {
    display: flex;            /* center content like other slides */
    align-items: center;
    justify-content: center;
    overflow-x: hidden;       /* ensure no sideways scroll on worlds */
}
.slide--world .slide__header {
    position: absolute;
    top: clamp(2rem, 5vw, 3.5rem);
    left: clamp(2rem, 5vw, 3.5rem);
}
/* World select content: tighter width so buttons group together */
.slide--world .slide__content {
    width: min(100%, 780px);
    max-width: 780px;
    margin: 0 auto;
    justify-items: center;
}

.slide__header {
    width: 100%;
    display: flex;
    justify-content: flex-start;
}

.logo {
    width: clamp(140px, 18vw, 220px);
    background: rgba(255, 255, 255, 0.95);
    border-radius: 999px;
    padding: 8px 12px;
    box-shadow: 0 10px 24px rgba(0,0,0,0.25);
}

.slide__content {
    display: grid;
    gap: clamp(1.25rem, 4vw, 2.5rem);
    align-items: center;
    justify-items: center;
    width: min(100%, 780px);
}

/* Back button (secondary) */
.btn.btn--secondary {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.7);
    box-shadow: none;
}
.btn.btn--secondary:hover,
.btn.btn--secondary:focus {
    background: rgba(255, 255, 255, 0.08);
}

.slide__title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: 0.35em;
    text-transform: uppercase;
    text-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

/* Reduce title size on world select screen */
.slide--world .slide__title {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    letter-spacing: 0.25em;
}

.slide__quote {
    margin: 0;
    line-height: 1.8;
    font-size: clamp(1rem, 2vw, 1.3rem);
    background: rgba(0, 0, 0, 0.35);
    padding: 1.5rem 2rem;
    border-radius: 1.5rem;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
    font-weight: 300;
}

.btn {
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.3em;
    padding: 1.2rem 2.5rem;
    border: none;
    border-radius: 999px;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background: var(--btn-gradient);
    color: #fff;
    box-shadow: 0 18px 35px rgba(255, 138, 216, 0.4);
}

.btn:focus,
.btn:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 24px 40px rgba(255, 138, 216, 0.6);
}

.btn:active {
    transform: translateY(1px) scale(0.99);
}

.world-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(160px, 1fr));
    grid-auto-rows: auto;
    gap: clamp(0.75rem, 2.5vw, 1.25rem);
    width: auto;            /* shrink to content */
    place-items: center;
    place-content: center;
}

.world-card {
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    padding: 1rem 1.8rem;
    border: none;
    border-radius: 999px;
    cursor: pointer;
    color: #fff;
    font-size: clamp(0.85rem, 2vw, 1rem);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.25);
}

.world-card:hover,
.world-card:focus {
    transform: translateY(-3px);
    box-shadow: 0 16px 28px rgba(0, 0, 0, 0.35);
}

/* Colored button looks for each world */
.world-card--green { background: linear-gradient(90deg, #2ecc71, #7bed9f); }
.world-card--pink { background: linear-gradient(90deg, #ff5fbd, #ffa6f6); }
.world-card--purple { background: linear-gradient(90deg, #7865ff, #b388ff); }
.world-card--orange { background: linear-gradient(90deg, #ff8c1a, #ffd56a); }

/* Detail slides for each world */
.slide--home {
    background: var(--bg-overlay),
        url('https://images.unsplash.com/photo-1560518883-ce09059eeffa?auto=format&fit=crop&w=1600&q=80') center/cover no-repeat fixed; /* Home exterior */
}

.slide--friendship {
    background: var(--bg-overlay),
        url('https://images.unsplash.com/photo-1524253482453-3fed8d2fe12b?auto=format&fit=crop&w=1600&q=80') center/cover no-repeat fixed; /* Friends together */
}

.slide--school {
    background: var(--bg-overlay),
        url('https://images.unsplash.com/photo-1509062522246-3755977927d7?auto=format&fit=crop&w=1600&q=80') center/cover no-repeat fixed;
}

.slide--dream {
    background: var(--bg-overlay),
        url('https://images.unsplash.com/photo-1469474968028-56623f02e42e?auto=format&fit=crop&w=1600&q=80') center/cover no-repeat fixed; /* Castle */
}

@media (max-width: 768px) {
    .slide__title {
        letter-spacing: 0.2em;
    }

    .slide__quote {
        padding: 1.2rem 1.4rem;
    }

    .btn {
        letter-spacing: 0.2em;
    }
}

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Coming Soon common styles */
.coming-soon {
    display: grid;
    gap: 1rem;
    place-items: center;
    background: rgba(0, 0, 0, 0.35);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
}
.coming-soon h2 {
    margin: 0;
    font-family: var(--font-display);
    letter-spacing: 0.2em;
}
.coming-soon .lock {
    color: #ffffffcc;
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.4));
}

/* Center Coming Soon blocks vertically within slides */
.slide--home .slide__content,
.slide--friendship .slide__content,
.slide--school .slide__content,
.slide--dream .slide__content {
    margin-top: auto;
    margin-bottom: auto;
}