@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Outfit:wght@500;600;700&display=swap');

:root {
    --bg-color: #05070c; /* Deeper premium dark background */
    --text-color: #f8fafc;
    --text-muted: #8e9bb0;
    --card-bg: rgba(20, 24, 38, 0.7);
    --border-color: rgba(255, 255, 255, 0.05);
    --accent-color: #ff6b00; /* Vibrant Orange */
    --accent-hover: #e05e00;
    --hud-bg: rgba(10, 12, 20, 0.85);
    --shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.5), 0 8px 12px -6px rgba(0, 0, 0, 0.4);
    --page-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-color);
}

/* Full Screen Layouts */
.full-screen-container {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
}

#desktopIframeContainer {
    overflow: hidden; /* Hide the scrollbar that is pushed off-screen */
}

#pdfIframe {
    width: calc(100% + 20px); /* Push the native vertical scrollbar off-screen */
    height: 100%;
    border: none;
    display: block;
}
/* Loader Screen */
.loader-screen,
.mobile-loader {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    z-index: 50;
    transition: opacity 0.4s ease, visibility 0.4s;
}

/* Dynamic Counter-Rotating Spinner with Pulsating Center Book Icon */
.spinner-container {
    position: relative;
    width: 90px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.spinner-outer {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 4px solid transparent;
    border-top-color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    border-radius: 50%;
    animation: spin-clockwise 1.5s cubic-bezier(0.5, 0.1, 0.5, 0.9) infinite;
}

.spinner-inner {
    position: absolute;
    width: 75%;
    height: 75%;
    border: 3px solid transparent;
    border-left-color: #ffa14a; /* Secondary lighter orange */
    border-right-color: #ffa14a;
    border-radius: 50%;
    animation: spin-counter-clockwise 1s linear infinite;
}

.spinner-logo {
    position: absolute;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: logo-pulse 2s ease-in-out infinite;
}

.spinner-logo svg {
    width: 28px;
    height: 28px;
    filter: drop-shadow(0 0 8px rgba(255, 107, 0, 0.4));
}

@keyframes spin-clockwise {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes spin-counter-clockwise {
    0% { transform: rotate(360deg); }
    100% { transform: rotate(0deg); }
}

@keyframes logo-pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.8;
        filter: drop-shadow(0 0 4px rgba(255, 107, 0, 0.2));
    }
    50% {
        transform: scale(1.15);
        opacity: 1;
        filter: drop-shadow(0 0 12px rgba(255, 107, 0, 0.7));
    }
}

.loader-text,
#loaderText {
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--text-color);
    text-transform: uppercase;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    animation: text-glow 2s ease-in-out infinite;
}

@keyframes text-glow {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; color: #ff9033; }
}

/* Scrollable Workspace */
.mobile-workspace {
    width: 100%;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 24px 16px 120px 16px; /* extra bottom padding for the HUD */
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch; /* smooth Momentum scroll for iOS */
    scrollbar-width: none; /* Hide scrollbar for Firefox */
    -ms-overflow-style: none; /* Hide scrollbar for IE/Edge */
}

.mobile-workspace::-webkit-scrollbar {
    display: none; /* Hide scrollbar for Chrome, Safari, Edge */
}

.pdf-canvas-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
}

/* Canvas Pages Wrapper */
.pdf-page-wrapper {
    background-color: #1e293b;
    background: radial-gradient(circle at center, #1b253b 0%, #080c14 100%);
    box-shadow: var(--page-shadow);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Page Shimmer Loading Placeholder */
.pdf-page-wrapper.loading::before,
.pdf-page-wrapper.rendering::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 0, 0.03), transparent);
    animation: shimmer 1.5s infinite;
    z-index: 1;
}

.pdf-page-wrapper:not(.loading):not(.rendering)::before {
    animation-play-state: paused;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.pdf-page-wrapper canvas {
    display: block;
    width: 100% !important;
    height: auto !important;
    filter: blur(0);
    opacity: 1;
    z-index: 0;
}

/* Canvas is hidden during loading/rendering */
.pdf-page-wrapper.loading canvas,
.pdf-page-wrapper.rendering canvas {
    opacity: 0;
}

/* Page Skeleton Loader */
.page-skeleton {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    z-index: 2;
    opacity: 0;
    transition: opacity 0.4s ease;
    animation-play-state: paused;
}

.pdf-page-wrapper.loading .page-skeleton,
.pdf-page-wrapper.rendering .page-skeleton {
    opacity: 1;
    animation-play-state: running;
}

.skeleton-blur-ring {
    position: absolute;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 107, 0, 0.15) 0%, transparent 70%);
    filter: blur(8px);
    animation: pulse-ring 2s ease-in-out infinite;
}

.skeleton-icon {
    color: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse-icon 2s ease-in-out infinite;
}

.skeleton-icon svg {
    width: 24px;
    height: 24px;
}

@keyframes pulse-ring {
    0%, 100% { transform: scale(0.9); opacity: 0.4; }
    50% { transform: scale(1.3); opacity: 0.9; }
}

@keyframes pulse-icon {
    0%, 100% { transform: scale(1); opacity: 0.3; }
    50% { transform: scale(1.1); opacity: 0.7; color: rgba(255, 107, 0, 0.4); }
}

/* Floating Unified HUD (Liquid Glass Styling) */
.unified-hud {
    position: absolute;
    bottom: calc(24px + env(safe-area-inset-bottom, 0px));
    left: 50%;
    transform: translateX(-50%);
    z-index: 99;
    display: flex;
    flex-direction: column-reverse; /* Popup displays ABOVE the HUD */
    align-items: center;
    gap: 12px;
    pointer-events: none; /* Let clicks pass through default viewport */
}

.hud-outer {
    pointer-events: auto; /* Enable clicks for the control bar itself */
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 99px;
    padding: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    animation: hudSlideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes hudSlideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Inner Pure White Buttons */
.hud-btn-pill {
    background: #ffffff;
    color: #0b0f19;
    border: none;
    border-radius: 99px;
    padding: 10px 24px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    letter-spacing: -0.01em;
    text-decoration: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.hud-btn-pill:hover {
    background: #f8fafc;
    transform: translateY(-1px) scale(1.02);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
    color: var(--accent-color);
}

.hud-btn-circle {
    background: #ffffff;
    color: #0b0f19;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    outline: none;
}

.hud-btn-circle:hover {
    background: #f8fafc;
    transform: translateY(-1px) scale(1.05);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
    color: var(--accent-color);
}

.hud-btn-pill svg,
.hud-btn-circle svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    display: block;
    pointer-events: none;
}

/* Glassmorphic Popover Menu */
.hud-popup {
    pointer-events: auto; /* Enable menu clicks */
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(32px);
    -webkit-backdrop-filter: blur(32px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    padding: 16px;
    width: 220px;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    gap: 6px;
    animation: popupSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes popupSlideUp {
    from { transform: translateY(10px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.popup-item {
    background: transparent;
    border: none;
    outline: none;
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 14px;
    border-radius: 12px;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    color: #e2e8f0;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
}

.popup-item:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--accent-color);
}

.popup-item svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
}

.popup-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.06);
    margin: 4px 0;
}

.popup-page-indicator {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-align: center;
    padding: 6px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.popup-theme-title {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    padding: 2px 14px 4px 14px;
}

.popup-theme-row {
    display: flex;
    gap: 12px;
    padding: 4px 14px;
}

.theme-dot {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    outline: none;
}

.theme-dot.active {
    border-color: var(--accent-color);
    transform: scale(1.1);
}

.theme-dot.light { background-color: #f8fafc; }
.theme-dot.dark { background-color: #0b0f19; border: 1px solid rgba(255,255,255,0.1); }
.theme-dot.sepia { background-color: #f4ecd8; }

/* Tablet & Mobile Tweaks */
@media (max-width: 480px) {
    .mobile-workspace {
        padding: 16px 8px 100px 8px;
    }
    
    .pdf-canvas-list {
        gap: 16px;
    }
    
    .pdf-page-wrapper {
        border-radius: 8px;
    }
    
    .unified-hud {
        bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    }
    
    .hud-outer {
        padding: 5px;
        gap: 6px;
    }
    
    .hud-btn-pill {
        padding: 10px 18px;
        font-size: 0.8rem;
    }
    
    .hud-download-pdf-suffix {
        display: none;
    }
    
    .hud-btn-circle {
        width: 38px;
        height: 38px;
    }
    
    .hud-popup {
        width: 190px;
        padding: 12px;
        border-radius: 16px;
    }
    
    .popup-item {
        padding: 10px 12px;
        font-size: 0.8rem;
    }
    
    .qr-modal-content {
        padding: 24px 16px;
    }
    
    .qr-modal-close {
        width: 36px;
        height: 36px;
        top: 12px;
        right: 12px;
    }
}

/* Light Theme Variables */
.light-theme {
    --bg-color: #f8fafc;
    --text-color: #0f172a;
    --text-muted: #64748b;
    --card-bg: rgba(255, 255, 255, 0.75);
    --border-color: rgba(0, 0, 0, 0.06);
    --hud-bg: rgba(241, 245, 249, 0.85);
    --shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.1), 0 8px 12px -6px rgba(0, 0, 0, 0.08);
    --page-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.light-theme .hud-outer {
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.06) 0%, rgba(0, 0, 0, 0.02) 100%);
    border-color: rgba(0, 0, 0, 0.08);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.light-theme .hud-btn-pill,
.light-theme .hud-btn-circle {
    background: #0f172a;
    color: #ffffff;
}

.light-theme .hud-btn-pill:hover,
.light-theme .hud-btn-circle:hover {
    background: #1e293b;
    color: var(--accent-color);
}

/* Sepia Theme Variables */
.sepia-theme {
    --bg-color: #f4ecd8;
    --text-color: #433422;
    --text-muted: #7c6853;
    --card-bg: rgba(253, 251, 247, 0.75);
    --border-color: rgba(67, 52, 34, 0.08);
    --hud-bg: rgba(253, 251, 247, 0.85);
    --shadow: 0 10px 30px -5px rgba(67, 52, 34, 0.12), 0 8px 12px -6px rgba(67, 52, 34, 0.08);
    --page-shadow: 0 8px 32px rgba(67, 52, 34, 0.12);
}

.sepia-theme .hud-outer {
    background: linear-gradient(135deg, rgba(67, 52, 34, 0.08) 0%, rgba(67, 52, 34, 0.03) 100%);
    border-color: rgba(67, 52, 34, 0.1);
    box-shadow: 0 12px 40px rgba(67, 52, 34, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.sepia-theme .hud-btn-pill,
.sepia-theme .hud-btn-circle {
    background: #433422;
    color: #fdfbf7;
}

.sepia-theme .hud-btn-pill:hover,
.sepia-theme .hud-btn-circle:hover {
    background: #54412b;
    color: var(--accent-color);
}

/* QR Modal Styles */
.qr-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(5, 7, 12, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 200; /* Higher than HUD (99) and loading (50) */
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.qr-modal-content {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.12) 0%, rgba(255, 255, 255, 0.04) 100%);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 24px;
    padding: 32px 24px;
    width: 90%;
    max-width: 320px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    animation: scaleUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes scaleUp {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.qr-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(255, 255, 255, 0.08);
    color: #e2e8f0;
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.qr-modal-close:hover {
    background: rgba(255, 255, 255, 0.15);
    color: var(--accent-color);
    transform: scale(1.05);
}

.qr-modal-close svg {
    width: 16px;
    height: 16px;
}

.qr-modal-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 20px;
}

.qr-container {
    background: white;
    padding: 12px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    margin-bottom: 20px;
}

.qr-container img {
    display: block;
    width: 160px;
    height: 160px;
}

.qr-modal-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.4;
    padding: 0 8px;
}

/* Light Theme Variables Adaptation */
.light-theme .qr-modal-content {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.6) 100%);
    border-color: rgba(0, 0, 0, 0.08);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.light-theme .qr-modal-close {
    background: rgba(0, 0, 0, 0.05);
    color: #475569;
}

.light-theme .qr-modal-close:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--accent-color);
}

/* Toast Notification */
.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: rgba(20, 24, 38, 0.95);
    border: 1px solid var(--accent-color);
    border-radius: 99px;
    padding: 10px 24px;
    color: var(--text-color);
    font-size: 0.85rem;
    font-weight: 500;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 300;
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.light-theme .toast {
    background: rgba(255, 255, 255, 0.95);
    border-color: var(--accent-color);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}