/* ====
   IELTSX UI — theme switch (light / dark / system) + filter dropdowns
   Loaded after the page CSS. Self-contained: it brings its own tokens so it
   looks the same on every page. ====*/
:root {
    --ix-bg: #fff;
    --ix-fg: hsl(222 47% 11%);
    --ix-muted: hsl(215 16% 47%);
    --ix-group: hsl(215 18% 50%);
    --ix-border: hsl(214 32% 91%);
    --ix-border-strong: hsl(215 20% 72%);
    --ix-hover: hsl(210 40% 96%);
    --ix-primary: hsl(221 83% 53%);
    --ix-popover: #fff;
    --ix-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
}

html.dark-mode {
    --ix-bg: hsl(0 0% 15%);
    --ix-fg: hsl(210 20% 90%);
    --ix-muted: hsl(210 10% 62%);
    --ix-group: hsl(210 12% 62%);
    --ix-border: hsl(0 0% 25%);
    --ix-border-strong: hsl(0 0% 42%);
    --ix-hover: hsl(0 0% 21%);
    --ix-primary: hsl(221 83% 60%);
    --ix-popover: hsl(0 0% 15%);
    --ix-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.55);
}

/* ── theme switch: sun | moon | monitor ── */
.theme-switch {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    height: 2rem;
    padding: 2px;
    border: 1px solid var(--ix-border);
    border-radius: 0.5rem;
    background: var(--ix-bg);
}

.theme-switch button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    border: 0;
    border-radius: 0.375rem;
    background: transparent;
    color: var(--ix-muted);
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.theme-switch button:hover {
    color: var(--ix-fg);
}

.theme-switch button[aria-checked="true"] {
    background: var(--ix-hover);
    color: var(--ix-fg);
}

.theme-switch button:focus-visible {
    outline: 2px solid var(--ix-primary);
    outline-offset: 1px;
}

.theme-switch svg {
    width: 1rem;
    height: 1rem;
}

/* ── filter dropdowns (single list) ── */
.filter-btn-wrap {
    position: relative;
    display: inline-flex;
}

.filter-btn-wrap .filter-trigger {
    cursor: pointer;
    user-select: none;
}

.filter-btn-wrap .filter-trigger .trigger-label {
    pointer-events: none;
}

.filter-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    z-index: 50;
    min-width: 180px;
    max-height: 70vh;
    overflow-y: auto;
    background: var(--ix-popover);
    color: var(--ix-fg);
    border: 1px solid var(--ix-border);
    border-radius: 0.5rem;
    box-shadow: var(--ix-shadow);
    padding: 0.25rem;
    display: none;
}

.filter-dropdown.open {
    display: block;
}

.filter-dropdown.align-right {
    left: auto;
    right: 0;
}

.filter-dropdown .filter-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.8rem;
    cursor: pointer;
    color: var(--ix-fg);
    transition: background 0.15s;
}

.filter-dropdown .filter-option:hover,
.filter-dropdown .filter-option.active {
    background: var(--ix-hover);
}

.filter-dropdown .filter-option.active {
    font-weight: 500;
}

.filter-dropdown .filter-option .check {
    margin-left: auto;
    opacity: 0;
}

.filter-dropdown .filter-option.active .check {
    opacity: 1;
}

/* ── filter panels (checkboxes, grouped) ── */
.filter-dropdown.filter-panel {
    padding: 1rem 1.1rem 1.1rem;
    width: 27rem;
    max-width: calc(100vw - 2rem);
    max-height: 75vh;
}

.filter-dropdown.filter-panel.compact {
    width: auto;
    min-width: 11rem;
    padding: 0.9rem 1.1rem;
}

.filter-panel-title {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.filter-group-title {
    margin: 0.9rem 0 0.55rem;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ix-group);
}

.filter-checks {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem 1.25rem;
}

.filter-checks.one-col {
    grid-template-columns: 1fr;
}

@media (max-width: 480px) {
    .filter-checks {
        grid-template-columns: 1fr;
    }
}

.filter-check {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.875rem;
    line-height: 1.25;
    cursor: pointer;
    user-select: none;
    color: var(--ix-fg);
}

.filter-check input[type="checkbox"] {
    -webkit-appearance: none;
    appearance: none;
    flex: none;
    display: grid;
    place-content: center;
    width: 1rem;
    height: 1rem;
    margin: 0;
    border: 1px solid var(--ix-border-strong);
    border-radius: 0.25rem;
    background: transparent;
    cursor: pointer;
    transition: background 0.12s, border-color 0.12s;
}

.filter-check input[type="checkbox"]::after {
    content: "";
    width: 0.5rem;
    height: 0.28rem;
    border-left: 2px solid #fff;
    border-bottom: 2px solid #fff;
    transform: rotate(-45deg) translate(1px, -1px) scale(0);
    transition: transform 0.12s;
}

.filter-check input[type="checkbox"]:checked {
    background: var(--ix-primary);
    border-color: var(--ix-primary);
}

.filter-check input[type="checkbox"]:checked::after {
    transform: rotate(-45deg) translate(1px, -1px) scale(1);
}

.filter-check input[type="checkbox"]:focus-visible {
    outline: 2px solid var(--ix-primary);
    outline-offset: 2px;
}

/* ── active filter badges ── */
.filter-badge-clear {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    background: var(--ix-hover);
    color: var(--ix-fg);
    padding: 0.15rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.65rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.filter-badge-clear:hover {
    background: var(--ix-border);
}

.filter-badge-clear svg {
    width: 12px;
    height: 12px;
}

/* ── filter triggers on pages without the shadcn tokens (speaking, writing) ── */
.ix-filters .filter-btn-wrap .filter-trigger {
    background: var(--ix-bg);
    color: var(--ix-fg);
    border: 1px solid var(--ix-border);
}

.ix-filters .filter-btn-wrap .filter-trigger:hover {
    background: var(--ix-hover);
}

.ix-filters .filter-btn-wrap .filter-trigger.has-value {
    border-color: var(--ix-primary);
}

/* ==== dark mode: sidebar tokens (same block as tw-fallback.css, so the sidebar is never white in dark mode) ==== */
html.dark-mode {
    --sidebar-background: 0 0% 12%;
    --sidebar: 0 0% 12%;
    --sidebar-foreground: 210 20% 85%;
    --sidebar-primary: 210 20% 90%;
    --sidebar-primary-foreground: 0 0% 12%;
    --sidebar-accent: 0 0% 18%;
    --sidebar-accent-foreground: 210 20% 90%;
    --sidebar-border: 0 0% 22%;
    --sidebar-ring: 217 91% 60%;
    /* page tokens: pages whose own :root block only has light values (Price, Predictions ...) still turn dark */
    --background: 0 0% 13%;
    --foreground: 210 20% 90%;
    --card: 0 0% 15%;
    --card-foreground: 210 20% 90%;
    --popover: 0 0% 15%;
    --popover-foreground: 210 20% 90%;
    --border: 0 0% 25%;
    --input: 0 0% 25%;
    --primary: 221 83% 60%;
    --primary-foreground: 210 40% 98%;
    --secondary: 0 0% 20%;
    --secondary-foreground: 210 20% 90%;
    --muted: 0 0% 20%;
    --muted-foreground: 210 10% 62%;
    --accent: 0 0% 20%;
    --accent-foreground: 210 20% 90%;
    --ring: 215 20% 40%;
    color-scheme: dark;
}

html.dark-mode body { background-color: hsl(var(--background)); color: hsl(var(--foreground)); }

[hidden], [data-admin-only][hidden] { display: none !important; }