:root {
    --bg-color: #0b0c10;
    --card-bg: rgba(22, 26, 35, 0.7);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f3f4f6;
    --text-muted: #9ca3af;
    --accent-color: #ff6b35; /* Coral orange */
    --accent-glow: rgba(255, 107, 53, 0.25);
    --font-family: 'Outfit', sans-serif;
    --transition-speed: 0.25s;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    height: 100dvh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Full Page Wrapper */
.viewer-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* Page Viewport */
.page-viewport {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.page-display-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.page-img {
    max-width: 90vw;
    max-height: 80vh;
    max-height: 80dvh;
    width: auto;
    height: auto;
    object-fit: contain;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    border-radius: 12px;
    background-color: #121318;
    border: 1px solid var(--border-color);
    display: block;
    opacity: 0;
    transform-origin: center center;
    transition: opacity var(--transition-speed) ease-in-out, transform 0.1s ease-out;
    user-select: none;
    -webkit-user-drag: none;
}

.page-img.loaded {
    opacity: 1;
}

/* Loading Spinner */
.loading-spinner {
    position: absolute;
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255,255,255,0.05);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
}

.loading-spinner.active {
    display: block;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Floating Clean Controls */
.floating-controls {
    position: absolute;
    bottom: calc(30px + env(safe-area-inset-bottom, 0px));
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 15px;
    background-color: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    padding: 10px 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    z-index: 10;
    transition: opacity 0.3s ease;
}

/* Auto-hide controls when mouse is inactive (optional, handled in JS) */
.floating-controls.fade-out {
    opacity: 0.1;
}
.floating-controls.fade-out:hover {
    opacity: 1;
}

/* Control Buttons */
.nav-btn, .action-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.nav-btn:hover, .action-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--accent-color);
}

.nav-btn:active, .action-btn:active {
    transform: scale(0.9);
}

.control-divider {
    width: 1px;
    height: 20px;
    background-color: var(--border-color);
    margin: 0 5px;
}

/* Custom Minimal Dropdown Select */
.page-selector-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    font-size: 0.95rem;
}

.clean-select {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    padding: 2px 6px;
    border-radius: 4px;
    transition: background-color 0.2s ease;
    text-align-last: center;
}

.clean-select:hover, .clean-select:focus {
    background-color: rgba(255, 255, 255, 0.08);
}

.clean-select option {
    background-color: #121318;
    color: var(--text-primary);
}

.total-pages {
    color: var(--text-muted);
}

/* Responsive adjustments */
@media (max-height: 600px) {
    .page-display-wrapper {
        max-height: 80vh;
        max-height: 80dvh;
    }
    .floating-controls {
        bottom: calc(15px + env(safe-area-inset-bottom, 0px));
        padding: 6px 16px;
    }
}