/* Shared with iOS StudyPaper: charcoal paper, warm ink and muted brass. */
body.is-local-quiz,
body.is-paper-study {
    --study-bg: #191a18;
    --study-card: #282925;
    --study-highlight: #30312c;
    --study-ink: #e8e2d5;
    --study-muted: #beb9aa;
    --study-accent: #c3ab83;
    --study-rule: #45463d;
    --study-action: #514532;
    --study-action-rule: #8c795a;
    background: var(--study-bg);
    color: var(--study-ink);
    color-scheme: dark;
}
.is-local-quiz .lq-wrapper,
.is-paper-study .seq-practice-wrap {
    --wq-bg: var(--study-bg);
    --wq-surface: var(--study-card);
    --wq-surface-2: var(--study-highlight);
    --wq-text: var(--study-ink);
    --wq-text-soft: var(--study-ink);
    --wq-text-muted: var(--study-muted);
    --wq-border: var(--study-rule);
    --wq-border-strong: var(--study-rule);
    --wq-accent: var(--study-accent);
    background: var(--study-bg);
}
.is-local-quiz .lq-wrapper { max-width: 720px; }
.is-local-quiz > .main-wrapper,
.is-paper-study > .main-wrapper { background: var(--study-bg); }
.is-local-quiz .lq-header { padding-block: 9px; gap: 12px; }
.is-local-quiz .lq-title { color: var(--study-ink); font-size: 0.95rem; font-weight: 600; }
.is-local-quiz .lq-session-type { color: var(--study-accent); font-weight: 500; }
.is-local-quiz .lq-icon-btn,
.is-local-quiz .lq-bookmark-btn {
    width: 44px;
    height: 44px;
    background: var(--study-card);
    border-color: var(--study-rule);
    color: var(--study-muted);
}
.is-local-quiz .lq-bookmark-btn.is-active { color: var(--study-accent); border-color: var(--study-accent); }
.is-local-quiz .lq-progress-info { color: var(--study-muted); font-weight: 400; font-variant-numeric: tabular-nums; }
.is-local-quiz .lq-timer { color: var(--study-muted); }
.is-local-quiz .lq-progress-track { height: 3px; background: var(--study-rule); }
.is-local-quiz .lq-progress-fill { background: var(--study-accent); }
.is-local-quiz .lq-card__inner { transition-duration: 0.26s; border-radius: 12px; }
.is-local-quiz .lq-card__face,
.is-paper-study .flashcard-front,
.is-paper-study .flashcard-back {
    background: var(--wq-paper-grain),
        radial-gradient(ellipse at top left, #ede6d507, transparent 65%),
        linear-gradient(145deg, var(--study-highlight), var(--study-card));
    border: 1px solid var(--study-rule);
    border-radius: 12px;
    color: var(--study-ink);
    /* Three fine edges read as a small stack of stock, without taking layout space. */
    box-shadow: inset 0 1px 0 #ede6d50c, 0 3px 0 -1px #34352e,
        0 4px 0 -1px #57564a, 0 7px 0 -2px #2c2d27, 0 14px 24px #00000038;
}
.is-local-quiz .lq-card__face { padding: 26px; }
.is-local-quiz .lq-card__meta { margin-bottom: 18px; }
.is-local-quiz .lq-card__meta::after { content: ''; width: 32px; height: 1px; background: var(--study-rule); }
.is-local-quiz .lq-tag,
.is-local-quiz .lq-tag--ans {
    background: transparent;
    border: 0;
    border-radius: 0;
    padding: 0;
    color: var(--study-accent);
    font-weight: 500;
    letter-spacing: 0.12em;
}
.is-local-quiz .lq-flip-hint {
    flex-shrink: 0;
    width: 100%;
    margin-top: 12px;
    justify-content: center;
    padding-top: 14px;
    border-top: 1px solid var(--study-rule);
    color: var(--study-muted);
    font-weight: 400;
    font-size: 0.72rem;
}
.is-local-quiz .lq-card__content { padding-bottom: 0; }
.is-local-quiz .lq-wrapper.is-question-mode .lq-flip-hint { display: none; }
.is-local-quiz .lq-wrapper.is-question-mode .lq-card__content { padding-bottom: 14px; }
.is-local-quiz .lq-card__text,
.is-local-quiz .lq-card__answer-text,
.is-paper-study .flashcard-side-text {
    color: var(--study-ink);
    font-family: 'Noto Serif KR', 'AppleMyungjo', 'Nanum Myeongjo', Georgia, serif;
    font-size: clamp(1.25rem, 3.8vw, 1.65rem);
    font-weight: 500;
    line-height: 1.7;
}
.is-local-quiz .lq-card__answer-label { display: none; }
.is-local-quiz .lq-card__explanation { background: transparent; border: 0; border-top: 1px solid var(--study-rule); border-radius: 0; padding: 18px 0 0; }
.is-local-quiz .lq-exp-label,
.is-local-quiz .lq-exp-text { color: var(--study-muted); font-weight: 400; line-height: 1.7; }
.is-local-quiz .lq-bottom-controls { min-height: 0; gap: 12px; }
.is-local-quiz .lq-reveal-group { grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 8px; }
.is-local-quiz .lq-reveal-group .lq-action-hint { grid-column: auto; text-align: left; font-size: 0.75rem; }
.is-local-quiz .lq-reveal-btn { min-height: 44px; width: auto; padding: 8px 14px; background: transparent; border: 1px solid var(--study-rule); color: var(--study-ink); font-size: 0.8rem; font-weight: 500; border-radius: 12px; }
/* Keep the Swift decision controls vertical at every viewport for one-hand use. */
.is-local-quiz .lq-self-grade-group { grid-template-columns: minmax(0, 1fr); gap: 10px; }
.is-local-quiz .lq-grade-btn { min-height: 54px; padding: 12px 20px; justify-content: space-between; font-weight: 500; }
.is-local-quiz .lq-grade-btn__icon { order: 2; width: 18px; height: 18px; }
.is-local-quiz .lq-grade-btn__label { font-weight: 500; }
.is-local-quiz .lq-grade-btn--correct,
.is-paper-study .grade-btn-modern.grade-o {
    background: var(--study-action);
    border-color: var(--study-action-rule);
    color: var(--study-ink);
}
.is-local-quiz .lq-grade-btn--wrong,
.is-paper-study .grade-btn-modern.grade-x {
    background: var(--study-card);
    border-color: var(--study-rule);
    color: var(--study-muted);
}
.is-local-quiz .lq-grade-btn:disabled,
.is-paper-study .grade-btn-modern:disabled { opacity: 0.4; cursor: default; transform: none; }
.is-local-quiz .lq-grade-btn:active:not(:disabled) { background: var(--study-highlight); transform: scale(0.99); }
.is-local-quiz .lq-opt-btn,
.is-local-quiz .lq-input-field,
.is-local-quiz .lq-auto-controls,
.is-local-quiz .lq-auto-nav-btn,
.is-local-quiz .lq-auto-interval select { background: var(--study-card); border-color: var(--study-rule); color: var(--study-ink); }
.is-local-quiz .lq-opt-btn:hover:not(:disabled) { background: var(--study-highlight); border-color: var(--study-accent); }
.is-local-quiz .lq-opt-btn.is-correct { border-color: var(--study-action-rule); background: var(--study-action); }
.is-local-quiz .lq-auto-status,
.is-local-quiz .lq-auto-interval,
.is-local-quiz .lq-auto-help { color: var(--study-muted); }
.is-local-quiz .lq-auto-status__dot { background: var(--study-accent); }
.is-local-quiz .lq-auto-nav-icon { background: var(--study-highlight); color: var(--study-accent); }
.is-local-quiz :is(button, a, input, select):focus-visible,
.is-paper-study :is(button, a, input):focus-visible { outline: 2px solid var(--study-accent); outline-offset: 3px; }

/* The server-rendered study route uses the same materials and controls. */
.is-paper-study .practice-hub { background: transparent; border-color: var(--study-rule); }
.is-paper-study .practice-hub__title { color: var(--study-ink); font-weight: 600; }
.is-paper-study .practice-hub__eyebrow { color: var(--study-accent); }
.is-paper-study .practice-hub__meta,
.is-paper-study .ps-progress-meta { color: var(--study-muted); }
.is-paper-study .practice-action,
.is-paper-study .ps-progress-timer { background: var(--study-card); color: var(--study-muted); border-color: var(--study-rule); }
.is-paper-study .ps-progress-track { height: 3px; border: 0; background: var(--study-rule); }
.is-paper-study .ps-progress-bar { background: var(--study-accent); }
.is-paper-study .question-card { background: var(--study-card); color: var(--study-ink); border-color: var(--study-rule); }
.is-paper-study .question-card:has(.flashcard-container) { background: transparent; border: 0; box-shadow: none; }
.is-paper-study .flashcard-inner { transition: transform 0.26s ease-in-out; }
.is-paper-study .flashcard-side-text { font-weight: 500 !important; color: var(--study-ink); }
.is-paper-study .flashcard-side-label { color: var(--study-accent) !important; font-weight: 500 !important; }
.is-paper-study .flashcard-side-label { position: absolute; top: 24px; left: 26px; text-align: left; }
.is-paper-study .flashcard-front::after,
.is-paper-study .flashcard-back::after { color: var(--study-muted); font-weight: 400; }
.is-paper-study .flashcard-flip-hint,
.is-paper-study .flashcard-side-flip { background: var(--study-card); color: var(--study-muted); border-color: var(--study-rule); }
.is-paper-study .grading-buttons > div { flex-direction: column; width: 100%; }
.is-paper-study .grade-btn-modern { flex: 1; min-width: 0; min-height: 54px; border-radius: 14px; }
.is-paper-study .grade-btn-modern.grade-o { background: var(--study-action) !important; border-color: var(--study-action-rule) !important; color: var(--study-ink) !important; }
.is-paper-study .grade-btn-modern.grade-x { background: var(--study-card) !important; border-color: var(--study-rule) !important; color: var(--study-muted) !important; }
.is-paper-study .question-card:has(.flashcard-container) .flashcard-grading::before { content: '이미 아는 답이라면 바로 알아요'; color: var(--study-muted); }
.is-paper-study .question-card:has(.flashcard-container) .flashcard-grading.is-graded::before { content: none; }
.is-paper-study .question-card:has(.flashcard-container) .flashcard-grading:not([style*="display: none"]) { background: var(--study-card) !important; border-color: var(--study-rule) !important; }
.is-paper-study .question-card:has(.flashcard-container) .flashcard-side-flip { background: var(--study-card) !important; border-color: var(--study-rule) !important; color: var(--study-accent) !important; }
@media (hover: hover) {
    .is-paper-study .grade-btn-modern.grade-o:hover:not(:disabled),
    .is-paper-study .grade-btn-modern.grade-x:hover:not(:disabled),
    .is-local-quiz .lq-grade-btn:hover:not(:disabled) { background: var(--study-highlight); border-color: var(--study-accent); }
}
@media (max-width: 767px) {
    .is-local-quiz .lq-card__face { padding: 22px; }
}
@media (max-height: 620px) {
    .is-local-quiz .lq-header { padding-block: 4px; }
    .is-local-quiz .lq-card__face { padding: 16px; }
    .is-local-quiz .lq-bottom-controls { gap: 8px; }
    .is-local-quiz .lq-grade-btn { min-height: 48px; }
}
@media (prefers-reduced-motion: reduce) {
    .is-local-quiz .lq-card__inner,
    .is-paper-study .flashcard-inner { transition: none; }
}

/* Keep the server study screen focused on a readable single question. */
.is-paper-study .seq-practice-wrap { max-width: 760px; margin-inline: auto; }
.is-paper-study :is(.practice-hub, .ps-progress-wrap, #practice-form) { box-sizing: border-box; width: 100%; max-width: 720px !important; margin-inline: auto; }
.is-paper-study .practice-hub { padding: 12px 0 18px; border: 0; border-bottom: 1px solid var(--study-rule); border-radius: 0; align-items: center; }
.is-paper-study .practice-hub__eyebrow { padding: 0; background: transparent; letter-spacing: .08em; font-weight: 500; }
.is-paper-study .practice-hub__title { font-size: 1.2rem; line-height: 1.5; overflow-wrap: anywhere; }
.is-paper-study .practice-hub__actions { align-items: center; gap: 8px; }
.is-paper-study .practice-action { min-height: 40px; border-radius: 10px; }
.is-paper-study .question-card { padding: 24px; border-radius: 12px; }
html.dark .is-paper-study .question-text { color: var(--study-ink) !important; font-size: 1.1rem; line-height: 1.8; font-weight: 500; overflow-wrap: anywhere; }
.is-paper-study .question-number { color: var(--study-accent); font-weight: 600; }
html.dark .is-paper-study input.seq-subjective-input { box-sizing: border-box; background: var(--study-highlight) !important; border-color: var(--study-rule) !important; color: var(--study-ink) !important; min-height: 52px; border-radius: 10px; }
.is-paper-study .seq-answer-guide { background: transparent; border: 0; border-top: 1px solid var(--study-rule); color: var(--study-muted); padding: 14px 0 0; font-size: .8rem; }
.is-paper-study .seq-answer-guide strong { color: var(--study-accent); }
html.dark .is-paper-study .option-item { background: var(--study-highlight); color: var(--study-ink); border-color: var(--study-rule); min-height: 52px; }
.is-paper-study .option-text { color: var(--study-ink); font-weight: 500; line-height: 1.6; }
.is-paper-study .option-hotkey-number { background: var(--study-card); border-color: var(--study-rule); color: var(--study-muted); }
.is-paper-study .option-checkbox { accent-color: var(--study-accent); }
.is-paper-study .option-item:has(.option-checkbox:checked) { border-color: var(--study-accent); background: var(--study-action); }
.is-paper-study .option-item:has(.option-checkbox:checked) .option-hotkey-number { background: var(--study-accent); border-color: var(--study-accent); color: var(--wq-on-accent); }
.is-paper-study .seq-navigation { margin-top: 16px; }
.is-paper-study :is(.quiz-btn-solid, .quiz-btn-check) { min-height: 48px; background: var(--study-action); border-color: var(--study-action-rule); color: var(--study-ink); }
.is-paper-study :is(.quiz-btn-solid, .quiz-btn-check):hover { background: var(--study-highlight); border-color: var(--study-accent); }
.is-paper-study .quiz-btn-outline:not(.quiz-btn-check) { background: var(--study-card); border-color: var(--study-rule); color: var(--study-ink); }
.is-paper-study .result-feedback-card { background: var(--study-card); }
.is-paper-study .question-card:has(.flashcard-container) .flashcard-grading:not([style*="display: none"]) { background: transparent !important; border: 0 !important; padding: 0; }
@media (min-width: 1024px) and (min-height: 621px) {
    .is-paper-study .seq-practice-wrap { padding-top: 12px; }
    .is-paper-study .question-card:has(.flashcard-container) { padding: 0; }
    .is-paper-study .flashcard-container { height: 340px; }
    .is-paper-study .flashcard-grading { margin-top: 20px; }
}

/* Dark walnut grain repeats the cover material on primary learning controls. */
.is-local-quiz .lq-grade-btn--correct,
.is-paper-study .grade-btn-modern.grade-o,
.is-paper-study :is(.quiz-btn-solid, .quiz-btn-check) {
    background: var(--wq-wood-fill) !important;
    color: var(--wq-on-wood) !important;
    box-shadow: inset 0 1px 0 #ffffff0d;
}

@media (hover: hover) {
    .is-local-quiz .lq-grade-btn--correct:hover:not(:disabled),
    .is-paper-study .grade-btn-modern.grade-o:hover:not(:disabled),
    .is-paper-study :is(.quiz-btn-solid, .quiz-btn-check):hover:not(:disabled) {
        background: var(--wq-wood-hover) !important;
    }
}

/* Auto play shares the available viewport between the card and its controls.
   A vh-sized, non-shrinking card otherwise pushes playback and the ad below it. */
@media (max-width: 1023px) and (orientation: portrait), (max-width: 767px) {
    .is-local-quiz .lq-wrapper.is-auto-mode { overflow: hidden; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-main-layout {
        flex: 1 1 0;
        height: 100%;
        min-height: 0;
    }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-title {
        display: -webkit-box;
        -webkit-box-orient: vertical;
        -webkit-line-clamp: 2;
        overflow: hidden;
    }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-card-container {
        flex: 1 1 0;
        height: auto;
        min-height: 0;
        margin-bottom: 8px;
    }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-card__inner { min-height: 0; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-navigation { gap: 8px; margin-bottom: 8px; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-nav-btn { min-height: 44px; padding-block: 6px; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-controls { gap: 6px; padding: 8px 10px; margin-bottom: 0; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-actions {
        display: grid;
        grid-template-columns: auto minmax(0, 1fr) minmax(0, 1fr);
        gap: 8px;
    }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-actions > button,
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-interval select { min-height: 44px; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-help { display: none; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-ad-slot { margin-top: 8px; margin-bottom: 0; }
}

/* Keep a phone in landscape usable without a second page of controls. */
@media (max-width: 1023px) and (max-height: 500px) and (orientation: landscape) {
    body.is-local-quiz:has(.is-auto-mode) { height: 100dvh; min-height: 0; padding: 0 !important; overflow: hidden; }
    .is-local-quiz:has(.is-auto-mode) > :is(.top-header, .bottom-nav, .desktop-footer, .desktop-side-multiplex-ad) { display: none !important; }
    .is-local-quiz .lq-wrapper.is-auto-mode {
        position: fixed;
        inset: 0;
        z-index: 1001;
        width: 100%;
        max-width: none;
        height: 100dvh;
        min-height: 0;
        padding: max(8px, env(safe-area-inset-top)) max(14px, env(safe-area-inset-right)) max(8px, env(safe-area-inset-bottom)) max(14px, env(safe-area-inset-left));
        overflow: hidden;
    }
    /* Session loading sets display:flex inline; keep its display:none completion state. */
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-main-layout[style*="display: flex"] { display: grid !important; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-main-layout {
        display: grid;
        grid-template-columns: minmax(0, 1fr) 280px;
        grid-template-rows: auto auto minmax(44px, 1fr) auto 50px;
        gap: 8px 14px;
        height: 100%;
        min-height: 0;
    }
    .is-local-quiz .lq-wrapper.is-auto-mode :is(.lq-header, .lq-progress-box, .lq-ad-slot) { grid-column: 1 / -1; margin: 0; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-header { padding: 0; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-card-container { grid-column: 1; grid-row: 3 / 5; height: auto; min-height: 0; margin: 0; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-card__inner { min-height: 0; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-navigation { grid-column: 2; grid-row: 3; align-self: end; margin: 0; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-controls { grid-column: 2; grid-row: 4; padding: 8px; margin: 0; gap: 6px; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-actions { display: grid; grid-template-columns: auto minmax(0, 1fr) minmax(0, 1fr); width: 100%; gap: 6px; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-actions > button { min-height: 44px; padding-inline: 8px; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-interval select { min-height: 44px; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-help { display: none; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-card__face { padding: 12px 16px; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-card__meta { margin-bottom: 6px; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-flip-hint { margin-top: 6px; padding-top: 6px; }
    .is-local-quiz .lq-wrapper.is-auto-mode .lq-title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
}

/* Native fields also need to override the older global dark form palette. */
html.dark .is-local-quiz .lq-auto-interval select {
    min-width: 0;
    background-color: var(--study-card) !important;
    color: var(--study-ink) !important;
    border-color: var(--study-rule) !important;
}
.is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-actions > button { white-space: nowrap; padding-inline: 10px; }
.is-local-quiz .lq-wrapper.is-auto-mode .lq-auto-interval { min-width: 0; gap: 4px; }