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

html, body {
    width: 100%;
    height: 100%;
    background-color: #0b1329;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: Arial, sans-serif;

    background: url('img/elitecircle-bg.jpg') no-repeat center / cover;
}

/* Screen Edge Margins (Gaps left & right) */
.flipbook-wrapper {
    position: relative;
    width: 100vw;
    height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px 60px;
}

/* 2. HOVER JITTER FIX: Disable abrupt layout recalculations */
.flipbookContainer {
    background: transparent !important;
    transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
    box-shadow: none;
    will-change: transform; /* Smooth Hardware Acceleration */
}

/* 1. FIRST COVER PAGE CENTER FIX: Shifts -25% Left */
.flipbook-wrapper.cover-active-first .flipbookContainer {
    transform: translateX(-25%);
}

/* 1. LAST COVER PAGE CENTER FIX: Shifts +25% Right */
.flipbook-wrapper.cover-active-last .flipbookContainer {
    transform: translateX(25%);
}

.page {
    background-color: #ffffff;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.page canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
    object-fit: contain;
    pointer-events: none; /* Prevents canvas hover lag jitter */
}

/* Elegant Bottom Control Bar */
.bottom-controls {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 6px 16px;
    border-radius: 30px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 10000;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}

.bottom-controls button {
    background: transparent;
    border: none;
    color: #ffffff;
    font-size: 1.2rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.bottom-controls button:hover {
    background: rgba(255, 255, 255, 0.2);
    color: #38bdf8;
}

.bottom-controls .divider {
    width: 1px;
    height: 18px;
    background: rgba(255, 255, 255, 0.2);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .flipbook-wrapper {
        padding: 10px;
    }
    .flipbook-wrapper.cover-active-first .flipbookContainer,
    .flipbook-wrapper.cover-active-last .flipbookContainer {
        transform: translateX(0); /* Center on single-page mobile layout */
    }
}

/* Corner area indicator override */
.st-page-flip-corner-bottom-right, 
.st-page-flip-corner-bottom-left {
    cursor: pointer !important;
}

/* Mouse hover over right bottom corner hint */
.page:hover {
    cursor: grab;
}

.page:active {
    cursor: grabbing;
}