/**
 * Trainer sub-header strip — single layout source for ALL trainers.
 * HTML shell: .trainer-chrome > [.trainer-toolbar-toggle] > .trainer-top > .trainer-toolbar
 * Fix header layout once here; do not duplicate per #view-* in style.css.
 */

/* --- Session container --- */
.app.app-trainer {
    max-width: none;
    width: 100%;
    margin: 0;
    padding: 0 0 20px;
    box-sizing: border-box;
}

/* Horizontal clip only on the scrolling root (html). Never set overflow-x on
   body — that forces a second vertical scrollbar and breaks sticky topbars. */
html:has(.app.app-trainer),
html.trainer-session {
    overflow-x: hidden;
}

#app-shell .app.app-trainer,
#app-shell .app.app-trainer > main {
    width: 100%;
    max-width: none;
    overflow: visible;
}

.app.app-trainer > main > .view.active {
    width: 100%;
    overflow: visible;
}

:is(.trainer-chrome, .article-trainer-chrome, .cases-trainer-chrome, .konjunktiv-trainer-chrome, .pos-trainer-chrome) {
    position: relative;
    width: 100%;
    overflow: visible;
}

:is(.trainer-workspace, .article-trainer-workspace, .cases-trainer-workspace, .konjunktiv-trainer-workspace, .pos-trainer-workspace) {
    width: 100%;
    max-width: min(1100px, 100%);
    margin-inline: auto;
    padding-inline: var(--trainer-toolbar-pad-x);
    box-sizing: border-box;
}

/* --- Trainer strip: in-flow until scrolled, then pinned under the main topbar --- */
.trainer-strip-sentinel {
    display: block;
    width: 100%;
    height: 0;
    margin: 0;
    padding: 0;
    border: 0;
    overflow: hidden;
    pointer-events: none;
    visibility: hidden;
}

.app.app-trainer :is(.trainer-top, .article-trainer-top, .cases-trainer-top, .konjunktiv-trainer-top, .pos-trainer-top) {
    position: relative;
    top: auto;
    z-index: 90;
    width: 100%;
    margin: 0 0 14px;
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
    overflow: visible;
}

/* Only after scroll: pin under the main topnav. Sentinel keeps the layout gap. */
.app.app-trainer .trainer-top--collapsible.is-pinned:not(.is-collapsed):not(.is-collapsing) {
    position: fixed;
    top: var(--topbar-stack-height);
    left: 0;
    right: 0;
    width: 100%;
    margin: 0;
    z-index: 90;
}

.app.app-trainer :is(.trainer-top, .article-trainer-top, .cases-trainer-top, .konjunktiv-trainer-top, .pos-trainer-top)::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background: var(--trainer-toolbar-strip-bg);
    backdrop-filter: blur(12px) saturate(130%);
    -webkit-backdrop-filter: blur(12px) saturate(130%);
    border-bottom: 1px solid color-mix(in srgb, var(--border) 75%, transparent);
    pointer-events: none;
}

.app.app-trainer :is(.trainer-top, .article-trainer-top, .cases-trainer-top, .konjunktiv-trainer-top, .pos-trainer-top) > .trainer-toolbar {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: var(--trainer-toolbar-inner-max);
    margin: 0 auto;
    padding: var(--trainer-toolbar-pad-y) var(--trainer-toolbar-pad-x) var(--trainer-toolbar-pad-bottom);
    box-sizing: border-box;
    min-height: auto;
    margin-bottom: 0;
    align-items: end;
}

.app.app-trainer :is(.cases-trainer-top, .pos-trainer-top) > .trainer-toolbar {
    overflow: visible;
}

/* --- Collapsible header (.trainer-top--collapsible; height animated in trainer-toolbar.js) --- */
:root {
    --trainer-toolbar-collapse-duration: 0.28s;
    --trainer-toolbar-collapse-ease: cubic-bezier(0.32, 0.72, 0, 1);
}

.app.app-trainer .trainer-top--collapsible {
    /* Do not set overflow:hidden here while expanded — clips the strip backdrop. */
    margin-bottom: 14px;
}

.app.app-trainer .trainer-top--collapsible:not(.is-collapsed):not(.is-collapsing) {
    overflow: visible;
}

/* During collapse animation: clip only — keep padding/background so controls don't jump */
.app.app-trainer .trainer-top--collapsible.is-collapsing {
    overflow: hidden;
    pointer-events: none;
    margin-bottom: 0;
}

.app.app-trainer .trainer-top--collapsible.is-collapsing > .trainer-toolbar {
    overflow: hidden;
}

.app.app-trainer .trainer-top--collapsible.is-collapsed {
    margin-bottom: 0;
    overflow: hidden;
    pointer-events: none;
    position: relative;
    top: auto;
}

.app.app-trainer .trainer-top--collapsible.is-collapsed::before {
    display: none;
}

.app.app-trainer .trainer-top--collapsible.is-collapsed > .trainer-toolbar {
    padding-block: 0;
    overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
    .app.app-trainer .trainer-top--collapsible {
        transition: none;
    }
}

/* --- Collapse toggle pill (one markup for all trainers) --- */
.trainer-toolbar-toggle {
    position: fixed;
    top: calc(var(--topbar-height) - 9px);
    left: 50%;
    z-index: 101;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 20px;
    margin: 0;
    padding: 0;
    border: 1px solid color-mix(in srgb, var(--border) 88%, transparent);
    border-radius: 999px;
    background: var(--topbar-bg);
    color: var(--text-muted);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transform: translateX(-50%);
    transition:
        opacity 0.18s ease,
        visibility 0.18s ease,
        color 0.18s ease,
        border-color 0.18s ease,
        box-shadow 0.18s ease,
        background 0.18s ease;
}

.app.app-trainer .view.active .trainer-toolbar-toggle {
    opacity: 0.72;
    visibility: visible;
}

.trainer-toolbar-toggle:hover,
.trainer-toolbar-toggle:focus-visible {
    opacity: 1;
    color: var(--text);
    border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
    outline: none;
}

.trainer-toolbar-toggle.is-collapsed {
    color: var(--accent);
    border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
    background: color-mix(in srgb, var(--accent) 8%, var(--topbar-bg));
}

.trainer-toolbar-toggle-icon {
    width: 0.82rem;
    height: 0.82rem;
    transition: transform var(--trainer-toolbar-collapse-duration) var(--trainer-toolbar-collapse-ease);
}

.trainer-toolbar-toggle.is-collapsed .trainer-toolbar-toggle-icon {
    transform: rotate(180deg);
}

@media (prefers-reduced-motion: reduce) {
    .trainer-toolbar-toggle-icon {
        transition: none;
    }
}

/* --- Toolbar grid (shared) --- */
.app.app-trainer .trainer-toolbar {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-items: end;
    gap: 16px;
}

.app.app-trainer .trainer-toolbar-center {
    justify-content: center;
    justify-self: center;
    flex-wrap: nowrap;
    gap: 0;
    max-width: 100%;
}

.app.app-trainer .trainer-toolbar-group {
    display: flex;
    align-items: flex-end;
    padding: 0 12px;
    flex-shrink: 0;
}

.app.app-trainer .trainer-toolbar-divider {
    width: 1px;
    align-self: stretch;
    min-height: 2.1rem;
    margin: 2px 2px 4px;
    background: color-mix(in srgb, var(--border) 52%, transparent);
    flex-shrink: 0;
}

.app.app-trainer .trainer-delay-control {
    min-width: 5.6rem;
}

/* One row; tier rows scroll horizontally (never clip button glow on parent) */
.app.app-trainer .trainer-toolbar-right,
.app.app-trainer .trainer-toolbar-center {
    flex-wrap: nowrap;
    overflow: visible;
}

.app.app-trainer .trainer-toolbar-group:has(.konjunktiv-tier-control),
.app.app-trainer .trainer-toolbar-group:has(.cases-tier-control),
.app.app-trainer .trainer-toolbar-group:has(.article-tier-pills) {
    max-width: min(56vw, 100%);
    min-width: 0;
}

.app.app-trainer :is(.konjunktiv-tier-control, .cases-tier-control, .article-tier-pills) {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.app.app-trainer :is(.konjunktiv-tier-control, .cases-tier-control, .article-tier-pills)::-webkit-scrollbar {
    display: none;
}

.app.app-trainer .trainer-toolbar-group.trainer-toolbar-icon-actions,
.app.app-trainer :is(.konjunktiv-tier-compact, .cases-tier-compact, .article-tier-compact) {
    overflow: visible;
    max-width: none;
}

.app.app-trainer .trainer-toolbar-icon-actions :is(.trainer-settings-btn, .trainer-rules-btn) {
    font-size: 0.8rem;
}

.app.app-trainer :is(.trainer-delay-label, .article-mode-compact-label, .trainer-filter-label) {
    white-space: nowrap;
}

:is(.trainer-top, .cases-trainer-top, .article-trainer-top, .konjunktiv-trainer-top):has(.trainer-scope--compact.is-open),
:is(#view-plural, #view-singular) .article-trainer-top:has(.trainer-scope--compact.is-open),
:is(.trainer-top, .cases-trainer-top):has(.trainer-scope--compact.is-open) > .trainer-toolbar,
.trainer-toolbar:has(.trainer-scope--compact.is-open) {
    overflow: visible;
}

.app.app-trainer :is(.trainer-top, .article-trainer-top, .cases-trainer-top, .konjunktiv-trainer-top):has(.trainer-scope--compact.is-open),
:is(#view-plural, #view-singular) .article-trainer-top:has(.trainer-scope--compact.is-open) {
    z-index: 250;
}

#view-trainer .trainer-toolbar-group:has(.trainer-intervals-btn) {
    display: inline-flex;
    align-items: flex-end;
    gap: 8px;
}

#view-trainer .article-mode-compact,
#view-cases .cases-tier-compact,
#view-konjunktiv .konjunktiv-tier-compact {
    max-width: none;
}

.app.app-trainer:has(#view-trainer.active) {
    padding-bottom: 16px;
}