/* Workbench / exam UI — loaded only on the step page. */
.lesson-chrome {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.75rem;
}
.exam-ref {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--faint);
    text-decoration: none;
}
.exam-ref:hover { color: var(--mute); text-decoration: none; }
/* Exam remaining minutes — quiet, not a big countdown UI */
.exam-timer {
    letter-spacing: 0.06em;
    text-transform: none;
    color: var(--mute);
    font-weight: 400;
    margin-left: 0.15rem;
}
.exam-timer--low {
    color: var(--warn, #c9a227);
}
.exam-timer-bar {
    height: 2px;
    margin: 0.15rem 0 0.55rem;
    background: var(--line);
    border-radius: 1px;
    overflow: hidden;
}
.exam-timer-bar-fill {
    display: block;
    height: 100%;
    width: 100%;
    background: var(--mute, #888);
    transform-origin: left center;
}
.exam-timer-bar--low .exam-timer-bar-fill {
    background: var(--warn, #c9a227);
}
.exam-lang-note {
    margin: 0 0 0.65rem;
    font-size: 12px;
    line-height: 1.4;
    color: var(--mute);
}
.exam-copy {
    cursor: copy;
    border-bottom: 1px dotted currentColor;
}
.exam-copy:hover,
.exam-copy:focus {
    background: var(--soft, rgba(127, 127, 127, 0.15));
    outline: none;
}
.exam-copy.is-copied {
    border-bottom-style: solid;
}
.step-title-main {
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    margin-bottom: 0.35rem;
    line-height: 1.15;
}
.section-goal {
    margin: 0 0 0.85rem;
    font-size: 13px;
    color: var(--mute);
    line-height: 1.4;
}
.done-form { margin-top: 1rem; }
.exam-auto-score {
    margin: 0.35rem 0 0;
    font-size: 12px;
    color: var(--mute, var(--muted));
}

/* ═══════════ EXAM QUESTION BROWSER (left panel) ═══════════ */
.exam-picker {
    margin: 0.15rem 0 0.85rem;
    padding: 0.65rem 0 0.75rem;
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 2;
    background: var(--bg);
}
.exam-picker-label {
    display: block;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--faint);
    margin-bottom: 0.35rem;
}
.exam-picker-row {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: wrap;
}
.exam-question-select {
    flex: 1 1 10rem;
    min-width: 0;
    font-family: var(--mono);
    font-size: 12px;
    line-height: 1.3;
    color: var(--fg);
    background: var(--soft);
    border: 1px solid var(--line);
    border-radius: 0;
    padding: 0.4rem 0.5rem;
    max-width: 100%;
    cursor: pointer;
}
.exam-question-select:focus {
    outline: 1px solid var(--fg);
    outline-offset: 1px;
}
.exam-picker-nav {
    display: flex;
    gap: 0.2rem;
    flex-shrink: 0;
}
.exam-nav-btn {
    min-width: 2rem;
    padding-left: 0.45rem;
    padding-right: 0.45rem;
}
.exam-nav-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}
.exam-flag-btn {
    flex-shrink: 0;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.02em;
    white-space: nowrap;
}
.exam-flag-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}
.exam-flag-btn.is-flagged {
    color: var(--warn, #c90);
    border-color: var(--warn, #c90);
}
.exam-q-body {
    margin: 0;
    padding: 0;
    font-family: var(--mono);
    font-size: 12.5px;
    line-height: 1.55;
    white-space: pre-wrap;
    word-break: break-word;
    color: var(--fg);
    background: transparent;
    border: 0;
    overflow-x: auto;
}
.exam-q-panel {
    border-top: 0;
    padding-top: 0.75rem;
}


/* ═══════════ WORKBENCH ═══════════ */
body.page-workbench {
    height: 100dvh;
    overflow: hidden;
}
body.page-workbench main {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
}
body.page-workbench footer.site { display: none; }

.workbench {
    --workbench-lesson-w: 360px;
    flex: 1;
    min-height: 0;
    display: grid;
    grid-template-columns: var(--workbench-lesson-w) 6px minmax(0, 1fr);
    grid-template-areas: "lesson split play";
    gap: 0;
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 0;
    border-top: 0;
}
.workbench-lesson {
    grid-area: lesson;
    min-height: 0;
    min-width: 0;
    overflow-y: auto;
    padding: 1rem 1.15rem 1.5rem;
    border-right: 0;
}
.workbench-split {
    grid-area: split;
    position: relative;
    z-index: 3;
    width: 6px;
    margin: 0;
    padding: 0;
    border: 0;
    border-left: 1px solid var(--line);
    background: var(--bg);
    cursor: col-resize;
    touch-action: none;
    user-select: none;
    outline: none;
}
.workbench-split::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: -3px;
    right: -3px;
}
.workbench-split:hover,
.workbench-split:focus-visible,
.workbench.is-resizing .workbench-split {
    background: var(--fg);
    border-left-color: var(--fg);
    opacity: 0.35;
}
.workbench-split:focus-visible {
    opacity: 0.55;
    outline: 1px solid var(--fg);
    outline-offset: -1px;
}
.workbench.is-resizing {
    cursor: col-resize;
    user-select: none;
}
body.workbench-resizing {
    cursor: col-resize !important;
    user-select: none !important;
}
body.workbench-resizing .workbench-play,
body.workbench-resizing .cka-terminal-host {
    pointer-events: none;
}
.workbench-play {
    grid-area: play;
    min-height: 0;
    min-width: 0;
    display: flex;
    background: #000;
}

.terminal-frame {
    position: relative;
    flex: 1;
    min-height: 0;
    min-width: 0;
    display: flex;
    flex-direction: column;
    background: #000;
    border: 0;
    border-radius: 0;
    overflow: hidden;
}
.terminal-titlebar {
    display: flex;
    align-items: center;
    padding: 0.5rem 0.85rem;
    background: #0a0a0a;
    border-bottom: 1px solid #222;
    flex-shrink: 0;
}
.terminal-title {
    flex: 1;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: #888;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.terminal-toolbar {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 0.75rem;
    background: #000;
    border-bottom: 1px solid #222;
    flex-wrap: wrap;
    flex-shrink: 0;
}
.session-start-wrap { position: relative; }
.register-tip-backdrop {
    position: fixed;
    inset: 0;
    z-index: 40;
    background: rgba(0, 0, 0, 0.45);
}
.register-tip-card {
    position: fixed;
    z-index: 41;
    width: min(22rem, calc(100vw - 1.5rem));
    max-height: calc(100vh - 1.5rem);
    overflow: auto;
    padding: 1rem 2rem 1.1rem 1.1rem;
    background: var(--bg);
    color: var(--fg);
    border: 1px solid var(--line-strong);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.4);
}
.register-tip-card .kicker {
    margin: 0 0 0.25rem;
}
.register-tip-card h2 {
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    margin: 0 0 0.35rem;
}
.register-tip-card .sub {
    font-size: 13px;
    color: var(--mute);
    margin: 0 0 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--line);
}
.register-tip-card .field { margin-bottom: 0.85rem; }
.register-tip-card .auth-alt { margin-top: 0.9rem; }
.register-tip-close {
    position: absolute;
    top: 0.45rem;
    right: 0.5rem;
    border: 0;
    background: transparent;
    color: var(--mute);
    font-size: 1.25rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.2rem 0.35rem;
}
.register-tip-close:hover { color: var(--fg); }
.idle-warn {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.65rem 1rem;
    padding: 0.7rem 0.85rem;
    background: color-mix(in srgb, var(--warn, #c90) 18%, transparent);
    border-bottom: 1px solid var(--line);
    color: var(--fg);
    font-size: 14px;
}
.idle-warn[hidden] { display: none; }
.idle-warn p { margin: 0; flex: 1 1 16rem; }
.session-end-backdrop {
    position: absolute;
    inset: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.55);
}
.session-end-card {
    position: relative;
    width: min(24rem, 100%);
    padding: 1.1rem 2rem 1.2rem 1.1rem;
    background: var(--bg);
    color: var(--fg);
    border: 1px solid var(--line-strong);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.4);
}
.session-end-card h2 {
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    margin: 0 0 0.4rem;
}
.session-end-card p {
    font-size: 13px;
    line-height: 1.5;
    color: var(--mute);
    margin: 0 0 1rem;
}
.session-end-actions {
    display: flex;
    gap: 0.5rem;
}
.session-end-close {
    position: absolute;
    top: 0.45rem;
    right: 0.5rem;
    border: 0;
    background: transparent;
    color: var(--mute);
    font-size: 1.25rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.2rem 0.35rem;
}
.session-end-close:hover { color: var(--fg); }
.terminal-status {
    font-family: var(--mono);
    font-size: 11px;
    color: #555;
    flex: 1;
    min-width: 100px;
}
.terminal-body {
    flex: 1;
    min-height: 0;
    background: #000;
    padding: 2px;
}
.terminal-body--mock {
    font-family: var(--mono);
    font-size: 13px;
    color: #aaa;
    padding: 0.9rem 1rem;
}
.terminal-body--mock .mock-dim { color: #444; margin-top: 0.4rem; }

.cka-terminal-host {
    height: 100%;
    background: #000;
    overflow: hidden;
}
.cka-terminal-host:empty::before {
    content: "Start the session to open the terminal.";
    display: block;
    padding: 0.9rem;
    font-size: 12px;
    color: #444;
    font-family: var(--mono);
}

@media (max-width: 960px) {
    body.page-workbench {
        height: auto;
        overflow: auto;
    }
    body.page-workbench main { display: block; }
    body.page-workbench footer.site { display: block; }
    .workbench {
        display: block;
        --workbench-lesson-w: auto !important;
    }
    .workbench-split { display: none; }
    .workbench-lesson { border-right: 0; }
    .workbench-play { display: block; min-height: 50vh; }
    .terminal-frame { height: min(55vh, 460px); border-top: 1px solid #222; }
}

/* ── Exam score link (step page) ── */
.exam-score-link {
    margin: 0.85rem 0 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}
.workbench-lesson .section-path {
    margin: 0 0 0.85rem;
}