/* ========================================
   Scroll Direction - Hide/Show Header
   ======================================== */

/* Add smooth transition to header elements */
.action-bar,
.navigation-menu {
    transition: transform 0.3s ease-in-out;
}

/* Hide header when scrolling down */
.action-bar.header-hidden {
    transform: translateY(-100%);
}

.navigation-menu.header-hidden {
    transform: translateY(-100%);
}

/* ========================================
   Back to Top Button
   ======================================== */

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--black-bar);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 99;
    transition: all 0.3s ease;
    opacity: 0.2;
}

.back-to-top:hover {
    opacity: 1;
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
    background: #27ae60;
}

.back-to-top.at-bottom {
    opacity: 1;
    background: #27ae60;
}

.back-to-top:active {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
}

/* Mobile adjustments */
@media (max-width: 768px) {
    .back-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 45px;
        height: 45px;
    }
}

/* ========================================
   Info Button (Bottom Left)
   ======================================== */

.info-button {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    width: 50px;
    height: 50px;
    background: var(--black-bar);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 99;
    transition: all 0.3s ease;
    opacity: 0.6; /* Increased from 0.2 for better discoverability */
}

.info-button:hover {
    opacity: 1;
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
    background: #27ae60;
}

.info-button.at-bottom {
    opacity: 1;
    background: #27ae60;
}

.info-button:active {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
}

/* Mobile adjustments - Flexbox button layout at bottom center */
@media (max-width: 900px) {
    /* Hide only zoom control on mobile */
    .zoom-toggle-btn,
    .zoom-control {
        display: none !important;
    }

    /* Reset fixed positioning for FLEXBOX buttons on mobile (exclude back-to-top) */
    .download-btn,
    .print-friendly-btn,
    .shortcuts-btn,
    .info-button {
        position: fixed !important;
        bottom: 1.5rem !important;
        left: auto !important;
        right: auto !important;
        width: 50px !important;
        height: 50px !important;
        opacity: 0.7 !important;
        transform: none !important;
    }

    /* Keep back-to-top button at bottom-right (same as desktop) */
    .back-to-top {
        position: fixed !important;
        bottom: 1.5rem !important;
        right: 1.5rem !important;
        width: 50px !important;
        height: 50px !important;
    }

    /* Flexbox container behavior - buttons arrange themselves */
    /* Buttons will be positioned using JavaScript or individual positioning */
    /* For now, use fixed spacing from center */

    /* 5 buttons: Download, Print, Shortcuts, Theme, Info */
    /* Spacing: 10px gap between buttons, centered horizontally */
    /* Total width: 5 * 50px + 4 * 10px = 290px */
    /* Start position: 50% - 145px */

    .download-btn {
        left: calc(50% - 145px) !important; /* First button */
    }

    .print-friendly-btn {
        left: calc(50% - 85px) !important; /* Second button */
    }

    .shortcuts-btn {
        left: calc(50% - 25px) !important; /* Third button */
    }

    /* Theme switcher button - fourth position (defined in color-theme.css) */
    /* left: calc(50% + 35px) !important; */

    .info-button {
        left: calc(50% + 95px) !important; /* Fifth button (last) */
    }

    /* Hover effects - only Y transform + enhanced shadow */
    .download-btn:hover,
    .download-btn.pdf-hover-sync,
    .print-friendly-btn:hover,
    .print-friendly-btn.print-hover-sync,
    .shortcuts-btn:hover,
    .info-button:hover,
    .back-to-top:hover {
        transform: translateY(-3px) !important;
        opacity: 1 !important;
        box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4) !important;
    }

    /* Keep at-bottom state without transform */
    .info-button.at-bottom,
    .shortcuts-btn.at-bottom {
        opacity: 1 !important;
        transform: none !important;
    }
}

/* Very narrow mobile - Move back-to-top UP on RIGHT side to avoid overlap */
@media (max-width: 483px) {
    .back-to-top {
        /* Stay on RIGHT side, just move UP higher */
        right: 1.5rem !important;
        bottom: 5.5rem !important; /* Higher position to clear bottom button row */
    }
}