/* Professional LMS Presentation Viewer Styles */
.sple-presentation-wrapper {
    position: relative;
    width: 100%;
    max-width: 960px;
    margin: 20px auto;
    background-color: #0d0e15;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.35);
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.sple-slide-viewport {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: #1a1c23;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#sple-slide-canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    -webkit-user-drag: none;
    user-drag: none;
    pointer-events: none;
}

.sple-loading-msg {
    position: absolute;
    color: #cfd2dc;
    font-size: 14px;
    letter-spacing: 0.02em;
}

.sple-error-message {
    color: #ffffff;
    padding: 40px;
    text-align: center;
    max-width: 520px;
}

.sple-error-message h3 {
    margin-bottom: 10px;
    color: #ff6b6b;
}

.sple-error {
    max-width: 960px;
    margin: 20px auto;
    padding: 20px;
    border-radius: 8px;
    background: #fff4f4;
    border: 1px solid #f0b4b4;
    color: #8a1f1f;
    font-weight: 600;
}

.sple-slide-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.45);
    color: #ffffff;
    border: none;
    font-size: 28px;
    padding: 16px 12px;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.25s ease;
    opacity: 0.3;
    z-index: 10;
}

.sple-slide-viewport:hover .sple-slide-nav {
    opacity: 1;
}

.sple-slide-nav:hover {
    background: rgba(34, 113, 177, 0.85);
    transform: translateY(-50%) scale(1.1);
}

.sple-nav-prev { left: 15px; }
.sple-nav-next { right: 15px; }

.sple-presentation-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background-color: #121319;
    border-top: 1px solid #282a36;
}

.sple-bar-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.sple-control-btn {
    background-color: #2271b1;
    color: #ffffff;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease;
}

.sple-control-btn:hover {
    background-color: #135e96;
}

.sple-slide-counter {
    color: #e0e0e0;
    font-size: 14px;
    font-weight: 500;
}