.rp-hero {
    margin-bottom: 1rem;
}
.rp-breadcrumb {
    display: flex; align-items: center; gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.82rem;
    margin-bottom: 1rem;
}
.rp-breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--t);
}
.rp-breadcrumb a:hover { color: var(--accent); }
.rp-breadcrumb .sep { color: var(--text-muted); }

.rp-card {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    align-items: start;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 2rem;
}
@media (max-width: 720px) {
    .rp-card {
        grid-template-columns: 1fr;
        padding: 1.25rem;
    }
}

.rp-cover-wrap {
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    padding: 1rem;
    aspect-ratio: 210 / 297;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.rp-cover {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
    border-radius: 4px;
}

.rp-info h1 {
    font-size: 1.6rem;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.01em;
    margin-bottom: 0.5rem;
}
.rp-info h1 small {
    display: block;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-top: 0.4rem;
}
.rp-info > p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.55;
    margin-bottom: 1.25rem;
}

.rp-meta {
    list-style: none;
    margin-bottom: 1.5rem;
    padding: 0;
}
.rp-meta li {
    display: flex; justify-content: space-between; align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
}
.rp-meta li:last-child { border-bottom: 0; }
.rp-meta .key {
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.72rem;
    font-weight: 600;
}
.rp-meta .val {
    color: var(--text);
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    text-align: right;
}

.rp-actions {
    display: flex; gap: 0.6rem;
    flex-wrap: wrap;
}
.rp-btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.75rem 1.4rem;
    border-radius: var(--radius-xs);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--t);
    border: 1px solid transparent;
}
.rp-btn.primary {
    background: var(--accent);
    color: white;
}
.rp-btn.primary:hover { background: var(--accent-hover); }
.rp-btn.secondary {
    background: rgba(255,255,255,0.04);
    color: var(--text);
    border-color: var(--border);
}
.rp-btn.secondary:hover {
    border-color: var(--border-hover);
    background: rgba(255,255,255,0.07);
}
.rp-btn svg { width: 16px; height: 16px; }

.rp-section-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin: 2rem 0 1rem;
}

.rp-toc {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem 2rem;
    margin-bottom: 2rem;
}
.rp-toc h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text);
}
.rp-toc ol {
    list-style: none;
    padding: 0;
    margin: 0 0 0.5rem;
    counter-reset: rp-section;
}
.rp-toc > ol > li {
    padding: 0.55rem 0;
    border-bottom: 1px solid var(--border);
    counter-increment: rp-section;
    font-size: 0.92rem;
    color: var(--text);
}
.rp-toc > ol > li:last-child { border-bottom: 0; }
.rp-toc > ol > li::before {
    content: counter(rp-section) ". ";
    color: var(--accent);
    font-weight: 700;
    margin-right: 0.4rem;
}
.rp-toc ul {
    list-style: none;
    padding-left: 1.25rem;
    margin: 0.4rem 0 0;
}
.rp-toc ul li {
    padding: 0.25rem 0;
    color: var(--text-secondary);
    font-size: 0.86rem;
}
.rp-toc ul li::before {
    content: '— ';
    color: var(--text-muted);
}

.rp-callout {
    background: rgba(34,197,94,0.06);
    border: 1px solid rgba(34,197,94,0.25);
    color: var(--text-secondary);
    border-radius: var(--radius-xs);
    padding: 0.9rem 1.1rem;
    font-size: 0.85rem;
    line-height: 1.5;
    margin-bottom: 2rem;
}
.rp-callout strong { color: var(--green); }

.rp-pdf-badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 4px 12px;
    background: rgba(239,68,68,0.12);
    color: var(--red);
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.75rem;
}

/* ============================================================
   Modos de estudo (hub) — 3 cards
   ============================================================ */
.rp-modes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}
@media (max-width: 820px) {
    .rp-modes-grid { grid-template-columns: 1fr; }
}
.rp-mode-card {
    display: flex; flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: all var(--t);
    text-decoration: none;
    color: var(--text);
    position: relative;
    overflow: hidden;
}
.rp-mode-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
}
.rp-mode-card .rp-mode-icon {
    width: 44px; height: 44px;
    border-radius: 12px;
    background: var(--accent-soft);
    color: var(--accent);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 1rem;
}
.rp-mode-card .rp-mode-icon svg { width: 22px; height: 22px; }
.rp-mode-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
}
.rp-mode-card p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.5;
    margin-bottom: 1rem;
    flex-grow: 1;
}
.rp-mode-count {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.5rem;
}
.rp-mode-cta {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--accent);
    font-weight: 600;
    font-size: 0.88rem;
}
.rp-mode-cta svg { width: 14px; height: 14px; transition: transform var(--t); }
.rp-mode-card:hover .rp-mode-cta svg { transform: translateX(3px); }

/* ============================================================
   FLASHCARDS
   ============================================================ */
.fc-toolbar {
    display: flex; flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
    margin-bottom: 1.25rem;
    padding: 0.75rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}
.fc-toolbar label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-right: 6px;
}
.fc-select, .qz-select {
    background: rgba(255,255,255,0.04);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    padding: 6px 10px;
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    transition: border-color var(--t);
}
.fc-select:hover, .qz-select:hover { border-color: var(--border-hover); }
.fc-stats {
    margin-left: auto;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}
.fc-progress {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.85rem;
    font-variant-numeric: tabular-nums;
}

.fc-stage {
    perspective: 1200px;
    margin-bottom: 1.25rem;
}
.fc-card {
    position: relative;
    width: 100%;
    min-height: 280px;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.32, 1);
}
.fc-card.flipped {
    transform: rotateY(180deg);
}
.fc-card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}
.fc-card-face .fc-side-tag {
    position: absolute;
    top: 1rem; left: 1rem;
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 4px 10px;
    border-radius: 50px;
}
.fc-card-face.front .fc-side-tag {
    background: rgba(23,141,154,0.12);
    color: var(--accent);
}
.fc-card-face.back {
    transform: rotateY(180deg);
    background: linear-gradient(180deg, var(--bg-card) 0%, rgba(23,141,154,0.04) 100%);
}
.fc-card-face.back .fc-side-tag {
    background: rgba(34,197,94,0.12);
    color: var(--green);
}
.fc-card-text {
    font-size: 1.05rem;
    line-height: 1.55;
    color: var(--text);
    max-width: 720px;
    font-weight: 500;
}
.fc-card-face.back .fc-card-text {
    font-weight: 400;
    color: var(--text-secondary);
}
.fc-topic-tag {
    position: absolute;
    bottom: 1rem; right: 1rem;
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 600;
}
.fc-flip-hint {
    position: absolute;
    bottom: 1rem; left: 1rem;
    font-size: 0.72rem;
    color: var(--text-muted);
}

.fc-controls {
    display: flex; flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 1rem;
}
.fc-btn, .qz-btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 0.55rem 1rem;
    background: rgba(255,255,255,0.04);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--t);
}
.fc-btn:hover, .qz-btn:hover {
    border-color: var(--border-hover);
    background: rgba(255,255,255,0.07);
}
.fc-btn:disabled, .qz-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.fc-btn svg, .qz-btn svg { width: 14px; height: 14px; }
.fc-btn.primary, .qz-btn.primary {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}
.fc-btn.primary:hover, .qz-btn.primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}
.fc-btn.know {
    border-color: rgba(34,197,94,0.35);
    color: var(--green);
}
.fc-btn.know:hover { background: rgba(34,197,94,0.08); }
.fc-btn.know.active {
    background: rgba(34,197,94,0.15);
    border-color: var(--green);
}
.fc-btn.review {
    border-color: rgba(255,235,59,0.35);
    color: var(--yellow);
}
.fc-btn.review:hover { background: rgba(255,235,59,0.08); }
.fc-btn.review.active {
    background: rgba(255,235,59,0.15);
    border-color: var(--yellow);
}

.fc-kbd-hint {
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}
.fc-empty, .qz-empty {
    text-align: center;
    color: var(--text-muted);
    padding: 3rem 1rem;
    font-size: 0.95rem;
}

/* ============================================================
   QUIZ
   ============================================================ */
.qz-config {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 2rem;
}
.qz-config h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}
.qz-config-row {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 1rem;
    align-items: center;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border);
}
.qz-config-row:last-of-type { border-bottom: 0; }
.qz-config-row label.qz-label {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.qz-segments {
    display: inline-flex;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    padding: 3px;
    gap: 3px;
    flex-wrap: wrap;
}
.qz-segment {
    background: transparent;
    color: var(--text-muted);
    border: 0;
    padding: 6px 12px;
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.82rem;
    cursor: pointer;
    transition: all var(--t);
}
.qz-segment:hover { color: var(--text); }
.qz-segment.active {
    background: var(--accent);
    color: white;
}
.qz-checkbox {
    display: inline-flex; align-items: center; gap: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.88rem;
}
.qz-checkbox input { accent-color: var(--accent); }
.qz-config-actions {
    display: flex; justify-content: flex-end;
    margin-top: 1.5rem;
}
@media (max-width: 720px) {
    .qz-config-row {
        grid-template-columns: 1fr;
        gap: 0.4rem;
    }
}

.qz-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem 2rem;
    margin-bottom: 1.25rem;
}
.qz-meta {
    display: flex; justify-content: space-between; align-items: center;
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.qz-meta .qz-progress {
    color: var(--accent);
    font-weight: 700;
}
.qz-question {
    font-size: 1.05rem;
    line-height: 1.55;
    color: var(--text);
    margin-bottom: 1.25rem;
    font-weight: 500;
}
.qz-options {
    display: flex; flex-direction: column;
    gap: 0.5rem;
    list-style: none;
    padding: 0; margin: 0 0 1.25rem;
}
.qz-option {
    display: flex; align-items: center; gap: 12px;
    padding: 0.75rem 1rem;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: all var(--t);
    color: var(--text);
    font-size: 0.92rem;
    line-height: 1.45;
    text-align: left;
    width: 100%;
    font-family: inherit;
}
.qz-option:hover {
    border-color: var(--border-hover);
    background: rgba(255,255,255,0.05);
}
.qz-option.selected {
    border-color: var(--accent);
    background: rgba(23,141,154,0.08);
}
.qz-option.correct {
    border-color: var(--green);
    background: rgba(34,197,94,0.08);
    color: var(--text);
}
.qz-option.incorrect {
    border-color: var(--red);
    background: rgba(239,68,68,0.08);
    color: var(--text);
}
.qz-option .qz-letter {
    flex-shrink: 0;
    width: 28px; height: 28px;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
    color: var(--text-muted);
    display: flex; align-items: center; justify-content: center;
    font-size: 0.78rem;
    font-weight: 700;
}
.qz-option.selected .qz-letter {
    background: var(--accent);
    color: white;
}
.qz-option.correct .qz-letter {
    background: var(--green);
    color: white;
}
.qz-option.incorrect .qz-letter {
    background: var(--red);
    color: white;
}
.qz-option:disabled {
    cursor: default;
}

.qz-feedback {
    border-radius: var(--radius-xs);
    padding: 1rem 1.1rem;
    font-size: 0.9rem;
    line-height: 1.55;
    margin-bottom: 1rem;
}
.qz-feedback.correct {
    background: rgba(34,197,94,0.06);
    border: 1px solid rgba(34,197,94,0.3);
    color: var(--text-secondary);
}
.qz-feedback.incorrect {
    background: rgba(239,68,68,0.06);
    border: 1px solid rgba(239,68,68,0.3);
    color: var(--text-secondary);
}
.qz-feedback strong {
    display: block;
    margin-bottom: 4px;
    font-size: 0.95rem;
}
.qz-feedback.correct strong { color: var(--green); }
.qz-feedback.incorrect strong { color: var(--red); }

.qz-actions {
    display: flex; gap: 0.5rem;
    justify-content: flex-end;
    flex-wrap: wrap;
}
.qz-kbd-hint {
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Result screen */
.qz-result-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.5rem;
    text-align: center;
}
.qz-result-card h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}
.qz-result-score {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}
.qz-result-score strong { color: var(--accent); font-weight: 700; }
.qz-result-actions {
    display: flex; gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}
.qz-review-list {
    display: flex; flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}
.qz-review-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 3px solid var(--text-muted);
    border-radius: var(--radius-xs);
    padding: 1rem 1.25rem;
}
.qz-review-item.correct { border-left-color: var(--green); }
.qz-review-item.incorrect { border-left-color: var(--red); }
.qz-review-item .qz-rev-q {
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.qz-review-item .qz-rev-line {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}
.qz-review-item .qz-rev-line .key {
    color: var(--text-muted);
    font-weight: 600;
    margin-right: 6px;
}
.qz-review-item .qz-rev-exp {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}