/* Light theme (default) colors */
:root {
    --primary-color: #0d6efd;
    --secondary-color: #f8f9fa;
    --text-color: #212529;
    --error-color: #dc3545;
    --success-color: #198754;
    --border-color: #dee2e6;
    --audio-bg-color: #f8f9fa;
    --bg-color: #fff;
    --bg-light-color: #f8f9fa;
    --card-bg-color: #fff;
    --card-border-color: #dee2e6;
    --audio-player-bg: #f8f9fa;
    --text-muted-color: #6c757d;
    --hover-bg-color: rgba(13, 110, 253, 0.05);
    --dragover-bg-color: rgba(13, 110, 253, 0.1);
    --history-item-bg: #fff;
    --history-item-border: #dee2e6;
    --disabled-color: #6c757d;
    --failed-bg-color: rgba(220, 53, 69, 0.05);
    --filter-container-bg: #f8f9fa;
    --preset-bg-color: #e9ecef;
    --preset-border-color: #dee2e6;
    --preset-hover-bg: #dee2e6;
    --code-block-bg: #f8f9fa;
    --code-block-border: #e9ecef;
    --modal-bg: #fefefe;
    --modal-overlay: rgba(0, 0, 0, 0.4);
    --modal-border: #888;
    --close-btn-color: #aaa;
    --close-btn-hover: #000;
    --theme-toggle-bg: transparent;
    --theme-toggle-color: #0d6efd;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --shadow-color-strong: rgba(0, 0, 0, 0.19);
    --form-check-color: #212529;
    --form-check-bg: #fff;
    --input-group-text-bg: #e9ecef;
    --input-group-text-color: #212529;
    --primary-rgb: 13, 110, 253;
    --success-rgb: 25, 135, 84;
    --danger-rgb: 220, 53, 69;
    --spinner-border-color: #0d6efd;
}

/* Dark theme colors */
.dark-theme {
    --primary-color: #4d8bff; /* Lighter blue for better contrast */
    --secondary-color: #343a40;
    --text-color: #e9ecef;
    --error-color: #f77;
    --success-color: #4ac776;
    --border-color: #495057;
    --audio-bg-color: #2d3339;
    --bg-color: #212529;
    --bg-light-color: #343a40;
    --card-bg-color: #343a40;
    --card-border-color: #495057;
    --audio-player-bg: #2d3339;
    --text-muted-color: #adb5bd;
    --hover-bg-color: rgba(77, 139, 255, 0.15);
    --dragover-bg-color: rgba(77, 139, 255, 0.2);
    --history-item-bg: #343a40;
    --history-item-border: #495057;
    --disabled-color: #adb5bd;
    --failed-bg-color: rgba(247, 119, 119, 0.1);
    --filter-container-bg: #2d3339;
    --preset-bg-color: #495057;
    --preset-border-color: #5a6268;
    --preset-hover-bg: #5a6268;
    --code-block-bg: #2d3339;
    --code-block-border: #495057;
    --modal-bg: #343a40;
    --modal-overlay: rgba(0, 0, 0, 0.6);
    --modal-border: #495057;
    --close-btn-color: #adb5bd;
    --close-btn-hover: #e9ecef;
    --theme-toggle-bg: transparent;
    --theme-toggle-color: #4d8bff;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --shadow-color-strong: rgba(0, 0, 0, 0.5);
    --form-check-color: #e9ecef;
    --form-check-bg: #495057;
    --input-group-text-bg: #495057;
    --input-group-text-color: #e9ecef;
    --primary-rgb: 77, 139, 255;
    --success-rgb: 74, 199, 118;
    --danger-rgb: 247, 119, 119;
    --spinner-border-color: #4d8bff;

    /* Keep Bootstrap 5.3 utility and component variables in sync with the
       application's class-based theme, including before the runtime is ready. */
    --bs-body-color: var(--text-color);
    --bs-body-bg: var(--bg-color);
    --bs-secondary-bg: var(--bg-light-color);
    --bs-border-color: var(--border-color);
    --bs-secondary-bg-subtle: #161719;
    --bs-secondary-border-subtle: #41464b;
    --bs-secondary-text-emphasis: #a7acb1;
    --bs-warning-bg-subtle: #332701;
    --bs-warning-border-subtle: #997404;
    --bs-warning-text-emphasis: #ffda6a;
}

/* Sticky Navbar Styles */
.sticky-navbar {
    position: sticky;
    top: 0;
    z-index: 1030; /* Higher than Bootstrap's modal z-index (1050) but lower than toast (1100) */
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.3s ease;
    /* Allow dropdowns and poppers to extend outside navbar without being clipped */
    overflow: visible !important;
}

.sticky-navbar.navbar-light {
    background-color: var(--bg-color) !important;
    border-bottom: 1px solid var(--border-color);
}

.sticky-navbar .navbar-brand {
    color: var(--text-color) !important;
    font-weight: 600;
}

/* Compact navbar adjustments: tighten spacing and reduce control sizes for a balanced look */
.sticky-navbar .container {
    display: flex;
    align-items: center;
    gap: 0.75rem; /* slightly tighter than the default */
}

.sticky-navbar .navbar-brand {
    margin-right: 0.5rem;
}

.sticky-navbar .d-flex.align-items-center.gap-3 {
    gap: 0.5rem !important; /* reduce gap between control groups */
}

/* Keep navbar controls on a single line; allow horizontal scroll instead of wrapping */
.sticky-navbar .container {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.5rem;
    overflow-x: auto; /* if it doesn't fit, scroll horizontally */
}

/* Brand should not shrink and should remain on one line */
.sticky-navbar .navbar-brand {
    flex: 0 0 auto;
    white-space: nowrap;
}

/* Group right-side controls so they align and can shrink as needed */
.sticky-navbar .navbar-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-left: auto;
    flex: 0 1 auto;
}

/* Allow select to shrink but keep usable min-width */
.vocabulary-select, .prompt-select {
    min-width: 80px;
    flex: 0 1 auto;
}


.sticky-navbar .btn-sm {
    padding: 0.35rem 0.5rem;
    font-size: 0.9rem;
}

.sticky-navbar .vocabulary-select,
.sticky-navbar .prompt-select {
    min-width: 100px; /* slightly smaller to fit better */
}

@media (min-width: 992px) {
    /* On large screens keep a subtle left/right alignment padding to match container cards */
    .sticky-navbar {
        padding-left: 0.5rem;
        padding-right: 0.5rem;
    }
}

.dark-theme .sticky-navbar.navbar-light {
    background-color: var(--card-bg-color) !important;
    border-bottom-color: var(--card-border-color);
}

/* Vocabulary controls in navbar */
.sticky-navbar .form-label {
    color: var(--text-muted-color) !important;
    font-weight: 500;
}

.dark-theme .sticky-navbar .form-label {
    color: var(--text-muted-color) !important;
}

/* Vocabulary and prompt select sizing and responsive behavior */
.vocabulary-select, .prompt-select {
    min-width: 120px;
}


/* Prevent navbar labels from wrapping and reduce control gaps to avoid line breaks */
.sticky-navbar .form-label {
    white-space: nowrap;
}

.sticky-navbar .navbar-controls {
    gap: 0.25rem;
}

/* Allow vocabulary and prompt selects to shrink more on narrow viewports while keeping usable width */
.vocabulary-select, .prompt-select {
    min-width: 72px;
    flex: 0 1 72px;
}

@media (max-width: 576px) {
    /* Hide vocabulary and prompt selects on very small screens to avoid navbar overcrowding */
    .vocabulary-select, .prompt-select {
        display: none !important;
    }


    /* Ensure the mobile dropdown toggle aligns with navbar controls */
    .sticky-navbar .dropdown.d-sm-none {
        display: inline-block !important;
    }

    /* Fix positioning of the mobile-only vocabulary dropdown so it anchors to the toggle
       instead of being placed off-screen by Popper in some viewport sizes. */
    .sticky-navbar .dropdown.d-sm-none {
        position: relative; /* anchor for absolute-positioned menu */
    }

    .sticky-navbar .dropdown.d-sm-none .dropdown-menu {
        position: absolute !important;
        /* Allow Popper to compute correct left/right and transform for viewport fit */
        min-width: 160px !important;
        z-index: 1100 !important; /* above modals/toasts in navbar context */
    }
}

/* Medium breakpoint tweaks to avoid navbar wrapping on intermediate widths */
@media (max-width: 1100px) {
    /* Hide the verbose labels to save space (Vocabulary: etc.) */
    .sticky-navbar .form-label {
        display: none !important;
    }

    /* Make vocabulary and prompt selects slightly more compact */
    .vocabulary-select, .prompt-select {
        min-width: 64px !important;
        flex: 0 1 64px !important;
    }

    /* Reduce gaps and navbar padding to pack controls tighter */
    .sticky-navbar .navbar-controls {
        gap: 0.25rem !important;
    }

    .sticky-navbar {
        padding-left: 0.25rem;
        padding-right: 0.25rem;
    }
}

/* Apply theme colors to elements */
body {
    background-color: var(--bg-light-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.card {
    background-color: var(--card-bg-color);
    border-color: var(--card-border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Theme toggle button */
.theme-toggle-btn {
    background-color: var(--theme-toggle-bg);
    color: var(--theme-toggle-color);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

/* Rotate only the icon to avoid layout/Popper jitter when the button is hovered */
.theme-toggle-btn i {
    display: inline-block;
    transition: transform 0.2s ease;
}
.theme-toggle-btn:hover {
    background-color: var(--hover-bg-color);
}
.theme-toggle-btn:hover i {
    transform: rotate(15deg);
}
/* Prevent rotation when dropdown/menu is open to avoid reflow */
.theme-toggle-btn.dropdown-toggle.show i,
.theme-toggle-btn.dropdown-toggle[aria-expanded="true"] i {
    transform: none !important;
}

.theme-toggle-btn.dropdown-toggle::after {
    display: none;
}

#themeMenu .dropdown-item.active {
    background-color: var(--hover-bg-color);
    color: var(--text-color);
}