/* TBE Lesson Viewer styles — Phase 3.
   Dark tokens on :root; light overrides in tbe-theme.css ([data-tbe-theme="light"]). */

:root:not([data-tbe-theme="light"]) {
    --tbev-canvas: #0B0D14;
    --tbev-panel: #12151E;
    --tbev-card: #1A1D27;
    --tbev-text: #F3F4F6;
    --tbev-muted: #9CA3AF;
    --tbev-disabled: #4B5563;
    --tbev-purple: #635BFF;
    --tbev-purple-hover: #4F46E5;
    --tbev-fire: #E63946;
    --tbev-border: rgba(255,255,255,0.06);
    --tbev-border-strong: rgba(255,255,255,0.12);
    --tbev-input-bg: rgba(0,0,0,0.2);
    --tbev-surface-inset: rgba(0,0,0,0.15);
    --tbev-surface-hover: rgba(255,255,255,0.05);
    --tbev-surface-subtle: rgba(255,255,255,0.02);
    --tbev-surface-muted: rgba(255,255,255,0.03);
    --tbev-accent-soft: #C7C2FF;
    --tbev-accent-term: #E8E6FF;
    --tbev-accent-badge: #A5B4FC;
    --tbev-btn-ghost-text: #D1D5DB;
    --tbev-chart-track: rgba(255,255,255,0.06);
    --tbev-chart-pct: #C7C2FF;
    --tbev-answer-key-bg: rgba(0,0,0,0.15);
    --tbev-answer-key-vault-bg: rgba(0,0,0,0.25);
    --tbev-pill-red-text: #FECACA;
    --tbev-pill-yellow-text: #FDE68A;
    --tbev-pill-green-text: #BBF7D0;
    --tbev-score-good-text: #BBF7D0;
    --tbev-score-mid-text: #FCD34D;
    --tbev-score-bad-text: #FCA5A5;
    --tbev-scrollbar-thumb: rgba(255,255,255,0.08);
    --tbev-scrollbar-thumb-hover: rgba(255,255,255,0.16);
    --luci-accent-text: var(--tbev-accent-soft);
}

body.tbev-locked { overflow: hidden; }

.tbev-overlay {
    position: fixed; inset: 0; z-index: 99000;
    display: none; align-items: stretch; justify-content: center;
    background: rgba(11,13,20,0.82); backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    padding: 0;
}
.tbev-overlay.tbev-open { display: flex; }

.tbev-shell {
    position: relative;
    width: 100%;
    max-width: 100%;
    height: 100%;
    max-height: 100%;
    display: flex; flex-direction: column;
    background: var(--tbev-card);
    border: 1px solid var(--tbev-border);
    border-radius: 0;
    overflow: hidden;
    box-shadow: none;
}

.tbev-head {
    display: flex; align-items: center; justify-content: space-between;
    gap: 12px; padding: 14px 18px;
    background: var(--tbev-panel);
    border-bottom: 1px solid var(--tbev-border);
}
.tbev-head-left { display: flex; align-items: center; gap: 10px; min-width: 0; }
.tbev-head-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

.tbev-tag {
    font-family: 'Source Code Pro', monospace;
    font-size: 11px; font-weight: 600;
    letter-spacing: 0.05em; text-transform: uppercase;
    color: var(--tbev-purple);
    background: rgba(99,91,255,0.10);
    border: 1px solid rgba(99,91,255,0.25);
    padding: 4px 8px; border-radius: 4px;
    flex-shrink: 0;
}
.tbev-title {
    font-family: 'Figtree', sans-serif;
    font-weight: 600; font-size: 17px; letter-spacing: -0.01em;
    color: var(--tbev-text); margin: 0;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    word-break: break-word;
    min-width: 0;
}
.tbev-status {
    font-family: 'Source Code Pro', monospace;
    font-size: 11px; color: var(--tbev-muted);
    transition: color .18s ease;
}
.tbev-status.tbev-status-error { color: var(--tbev-fire); }

.tbev-icon-btn {
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--tbev-border);
    color: var(--tbev-muted);
    padding: 7px; border-radius: 6px; cursor: pointer;
    transition: color .18s ease, background .18s ease, border-color .18s ease;
}
.tbev-icon-btn:hover {
    color: var(--tbev-text);
    background: rgba(255,255,255,0.05);
    border-color: var(--tbev-border-strong);
}

.tbev-body {
    flex: 1 1 auto; overflow-y: auto; padding: 28px 32px 48px;
    background: var(--tbev-card);
    outline: none;
}
.tbev-body::-webkit-scrollbar { width: 8px; }
.tbev-body::-webkit-scrollbar-track { background: transparent; }
.tbev-body::-webkit-scrollbar-thumb { background: var(--tbev-scrollbar-thumb); border-radius: 4px; }
.tbev-body::-webkit-scrollbar-thumb:hover { background: var(--tbev-scrollbar-thumb-hover); }

.tbev-article {
    color: var(--tbev-text);
    font-family: 'Figtree', sans-serif;
    font-size: 16px; line-height: 1.7;
    max-width: 760px; margin: 0 auto;
    padding-bottom: 2rem;
}
.tbev-article h1, .tbev-article h2, .tbev-article h3, .tbev-article h4 {
    font-family: 'Figtree', sans-serif; color: var(--tbev-text);
    letter-spacing: -0.02em; line-height: 1.2;
    margin: 1.6em 0 0.6em;
}
.tbev-article h1 { font-size: 28px; font-weight: 700; }
.tbev-article h2 { font-size: 22px; font-weight: 600; }
.tbev-article h3 { font-size: 18px; font-weight: 600; }
.tbev-article p  { margin: 0 0 1.1em; color: var(--tbev-text); }
.tbev-article p.tbev-empty { color: var(--tbev-muted); font-style: italic; }
.tbev-article ul { list-style-type: disc; margin: 0 0 1.1em; padding-left: 1.5em; }
.tbev-article ol { list-style-type: decimal; margin: 0 0 1.1em; padding-left: 1.5em; }
.tbev-article li { margin: 0 0 0.4em; display: list-item; }
.tbev-article strong { color: var(--tbev-text); font-weight: 600; }
.tbev-article em { color: var(--tbev-muted); }
.tbev-article a { color: var(--tbev-purple); text-decoration: none; border-bottom: 1px dashed var(--tbev-purple); }
.tbev-article a:hover { color: var(--tbev-text); border-bottom-style: solid; }
.tbev-article blockquote {
    margin: 1.2em 0; padding: 14px 18px;
    background: rgba(99,91,255,0.05);
    border-left: 3px solid var(--tbev-purple);
    border-radius: 0 8px 8px 0;
}
.tbev-article code {
    background: var(--tbev-surface-subtle); color: var(--tbev-text);
    padding: 2px 6px; border-radius: 4px;
    font-family: 'Source Code Pro', monospace; font-size: 13px;
}
.tbev-article pre {
    background: var(--tbev-input-bg); padding: 14px 16px; border-radius: 8px;
    border: 1px solid var(--tbev-border);
    overflow-x: auto; font-family: 'Source Code Pro', monospace; font-size: 13px;
    color: var(--tbev-text);
}
.tbev-article hr { border: 0; border-top: 1px solid var(--tbev-border); margin: 1.8em 0; }
.tbev-article img { max-width: 100%; border-radius: 8px; border: 1px solid var(--tbev-border); margin: 1em 0; }
.tbev-article details {
    background: var(--tbev-panel); border: 1px solid var(--tbev-border);
    border-radius: 8px; padding: 12px 14px; margin: 1em 0;
}
.tbev-article summary {
    cursor: pointer; font-weight: 600; color: var(--tbev-text);
    font-family: 'Figtree', sans-serif;
}
.tbev-article details[open] summary { margin-bottom: 8px; }

/* Interactive primitives. */
.tbev-article fieldset[data-luci-q],
.tbev-article div[data-luci-q] {
    border: 1px solid var(--tbev-border);
    background: var(--tbev-panel);
    border-radius: 8px;
    padding: 14px 16px; margin: 1.2em 0;
}
.tbev-article fieldset[data-luci-q] legend,
.tbev-article div[data-luci-q] > p:first-child {
    color: var(--tbev-text); font-weight: 600; padding: 0 4px;
    font-family: 'Figtree', sans-serif; font-size: 14px;
}

.tbev-article [data-luci-opt] {
    display: block; width: 100%; text-align: left;
    margin: 6px 0; padding: 10px 12px;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--tbev-border);
    border-radius: 6px;
    color: var(--tbev-text);
    font-family: 'Figtree', sans-serif; font-size: 14px; font-weight: 500;
    cursor: pointer;
    transition: background .18s ease, border-color .18s ease, color .18s ease, box-shadow .18s ease;
}
.tbev-article [data-luci-opt]:hover {
    background: rgba(255,255,255,0.05);
    border-color: var(--tbev-border-strong);
}
.tbev-article [data-luci-opt].tbev-opt-selected {
    background: rgba(99,91,255,0.10);
    border-color: rgba(99,91,255,0.55);
    color: #FFFFFF;
    box-shadow: 0 0 0 1px rgba(99,91,255,0.18) inset;
}
.tbev-article [data-luci-opt].tbev-opt-correct {
    border-color: rgba(34,197,94,0.55);
    background: rgba(34,197,94,0.08);
    color: #BBF7D0;
    box-shadow: 0 0 0 1px rgba(34,197,94,0.25) inset;
}
.tbev-article [data-luci-opt].tbev-opt-incorrect {
    border-color: rgba(230,57,70,0.55);
    background: rgba(230,57,70,0.08);
    color: #FCA5A5;
    box-shadow: 0 0 0 1px rgba(230,57,70,0.25) inset;
}

.tbev-article input[type="text"][data-luci-q],
.tbev-article input[type="number"][data-luci-q],
.tbev-article textarea[data-luci-q] {
    display: block; width: 100%; box-sizing: border-box;
    background: var(--tbev-input-bg);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 6px;
    color: var(--tbev-text);
    font-family: 'Figtree', sans-serif; font-size: 14px; line-height: 1.5;
    padding: 10px 12px; margin: 6px 0;
    transition: border-color .18s ease, box-shadow .18s ease;
}
.tbev-article textarea[data-luci-q] { min-height: 90px; resize: vertical; }
.tbev-article input[data-luci-q]::placeholder,
.tbev-article textarea[data-luci-q]::placeholder { color: var(--tbev-disabled); }
.tbev-article input[data-luci-q]:focus,
.tbev-article textarea[data-luci-q]:focus {
    outline: none; border-color: var(--tbev-purple);
    box-shadow: 0 0 0 3px rgba(99,91,255,0.18);
}
.tbev-article input[data-luci-q].tbev-input-correct,
.tbev-article textarea[data-luci-q].tbev-input-correct {
    border-color: rgba(34,197,94,0.55);
    box-shadow: 0 0 0 3px rgba(34,197,94,0.18);
}
.tbev-article input[data-luci-q].tbev-input-incorrect,
.tbev-article textarea[data-luci-q].tbev-input-incorrect {
    border-color: rgba(230,57,70,0.55);
    box-shadow: 0 0 0 3px rgba(230,57,70,0.18);
}

.tbev-article input[type="checkbox"][data-luci-q] {
    width: 16px; height: 16px;
    accent-color: var(--tbev-purple);
    margin-right: 6px; vertical-align: middle;
}

.tbev-article [data-luci-act] {
    display: inline-flex; align-items: center; gap: 6px;
    background: rgba(99,91,255,0.12);
    border: 1px solid rgba(99,91,255,0.35);
    color: #C4B5FD;
    padding: 6px 12px; border-radius: 6px; cursor: pointer;
    font-family: 'Source Code Pro', monospace;
    font-size: 12px; font-weight: 600; letter-spacing: 0.04em;
    text-transform: uppercase;
    transition: background .18s ease, border-color .18s ease, color .18s ease;
}
.tbev-article [data-luci-act]:hover {
    background: rgba(99,91,255,0.18);
    border-color: rgba(99,91,255,0.55);
    color: #FFFFFF;
}

/* ──────────────────────────────────────────────────────────
   Exercise card chrome (phase 4 — v1.1).
   Used when the viewer renders from `content_meta.questions`.
   Lessons coming through `content_html` keep the original chrome.
   ────────────────────────────────────────────────────────── */

.tbev-article .tbev-exercise { margin: 0; }
.tbev-article .tbev-instructions {
    background: rgba(99,91,255,0.05);
    border: 1px solid rgba(99,91,255,0.18);
    border-radius: 8px;
    padding: 12px 14px;
    margin: 0 0 1.4em;
    color: var(--tbev-text);
}
.tbev-article .tbev-instructions p { margin: 0 0 0.4em; }
.tbev-article .tbev-instructions p:last-child { margin-bottom: 0; }

.tbev-article .tbev-q {
    background: var(--tbev-panel);
    border: 1px solid var(--tbev-border);
    border-radius: 10px;
    padding: 16px 18px;
    margin: 0 0 1.0em;
    position: relative;
    transition: border-color .18s ease, background .18s ease;
}
.tbev-article .tbev-q:hover { border-color: var(--tbev-border-strong); }
.tbev-article .tbev-q-head {
    display: flex; align-items: flex-start; gap: 10px; margin-bottom: 0.55em;
}
.tbev-article .tbev-q--no-head .tbev-q-body {
    margin-top: 0;
}
.tbev-article .tbev-q-title {
    flex: 1; margin: 0;
    font-family: 'Figtree', sans-serif;
    font-size: 15px; font-weight: 600; line-height: 1.45;
    color: var(--tbev-text); letter-spacing: -0.02em;
}
.tbev-article .tbev-q-num {
    flex-shrink: 0;
    width: 26px; height: 26px; border-radius: 50%;
    background: rgba(92,84,231,0.10);
    border: 1px solid rgba(92,84,231,0.30);
    color: #5C54E7;
    font-family: 'Source Code Pro', monospace;
    font-size: 12px; font-weight: 700;
    display: inline-flex; align-items: center; justify-content: center;
    line-height: 1;
}
.tbev-article .tbev-q-chip {
    font-family: 'Source Code Pro', monospace;
    font-size: 10px; font-weight: 600;
    letter-spacing: 0.05em; text-transform: uppercase;
    color: var(--tbev-muted);
    padding: 3px 7px; border-radius: 4px;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--tbev-border);
}
.tbev-article .tbev-q-body { color: var(--tbev-text); }
.tbev-article .tbev-q-prompt {
    margin: 0 0 0.7em;
    font-family: 'Figtree', sans-serif;
    font-size: 15px; font-weight: 500; line-height: 1.5;
    color: var(--tbev-text);
}
/* Inside a .tbev-q card we don't need the older fieldset/div chrome. */
.tbev-article .tbev-q fieldset[data-luci-q],
.tbev-article .tbev-q div[data-luci-q] {
    border: 0; background: transparent;
    padding: 0; margin: 0;
}
.tbev-article .tbev-q .tbev-opt-letter {
    font-family: 'Source Code Pro', monospace;
    font-weight: 700;
    margin-right: 4px;
    color: var(--tbev-muted);
}
.tbev-article .tbev-q [data-luci-opt].tbev-opt-selected .tbev-opt-letter,
.tbev-article .tbev-q [data-luci-opt].tbev-opt-correct  .tbev-opt-letter,
.tbev-article .tbev-q [data-luci-opt].tbev-opt-incorrect .tbev-opt-letter { color: inherit; }

.tbev-article .tbev-gap-block {
    margin: 0;
    font-family: 'Figtree', sans-serif;
    font-size: 15px; line-height: 1.9;
    color: var(--tbev-text);
}
.tbev-article input.tbev-gap[data-luci-q] {
    display: inline-block !important;
    width: auto;
    min-width: 6ch; max-width: 16ch;
    margin: 0 4px;
    padding: 4px 8px;
    background: transparent;
    border: 0;
    border-bottom: 1px dashed rgba(255,255,255,0.30);
    border-radius: 0;
    font-family: 'Source Code Pro', monospace;
    font-size: 14px;
    color: var(--tbev-text);
    text-align: center;
    transition: border-color .18s ease, color .18s ease, background .18s ease;
}
.tbev-article input.tbev-gap[data-luci-q]:focus {
    outline: none;
    border-bottom-color: var(--tbev-purple);
    box-shadow: 0 1px 0 0 var(--tbev-purple);
}
.tbev-article input.tbev-gap[data-luci-q].tbev-input-correct {
    border-bottom-color: rgba(34,197,94,0.65);
    color: #BBF7D0;
    box-shadow: none;
}
.tbev-article input.tbev-gap[data-luci-q].tbev-input-incorrect {
    border-bottom-color: rgba(230,57,70,0.65);
    color: #FCA5A5;
    box-shadow: none;
}

.tbev-article .tbev-checkbox-row {
    display: flex; align-items: center; gap: 8px;
    font-family: 'Figtree', sans-serif;
    font-size: 14px; color: var(--tbev-text);
}

/* Footer */
.tbev-foot {
    display: flex; align-items: center; justify-content: space-between;
    gap: 12px; padding: 12px 18px;
    background: var(--tbev-panel);
    border-top: 1px solid var(--tbev-border);
    flex-wrap: wrap;
}
.tbev-foot-left { display: flex; align-items: center; gap: 10px; min-width: 0; flex-wrap: wrap; }
.tbev-foot-meta {
    font-family: 'Source Code Pro', monospace;
    font-size: 12px; color: var(--tbev-muted);
}
.tbev-foot-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.tbev-score {
    font-family: 'Source Code Pro', monospace;
    font-size: 12px; font-weight: 700;
    letter-spacing: 0.04em; text-transform: uppercase;
    padding: 4px 10px; border-radius: 6px;
    border: 1px solid var(--tbev-border);
    background: var(--tbev-surface-subtle);
    color: var(--tbev-muted);
}
.tbev-score-good {
    background: rgba(34,197,94,0.10);
    border-color: rgba(34,197,94,0.45);
    color: var(--tbev-score-good-text);
}
.tbev-score-mid {
    background: rgba(245,158,11,0.10);
    border-color: rgba(245,158,11,0.45);
    color: var(--tbev-score-mid-text);
}
.tbev-score-bad {
    background: rgba(230,57,70,0.10);
    border-color: rgba(230,57,70,0.45);
    color: var(--tbev-score-bad-text);
}

.tbev-btn-check {
    background: rgba(99,91,255,0.12);
    border-color: rgba(99,91,255,0.45);
    color: #C4B5FD;
}
.tbev-btn-check:hover {
    background: rgba(99,91,255,0.20);
    border-color: rgba(99,91,255,0.65);
    color: #FFFFFF;
}

.tbev-btn {
    cursor: pointer;
    font-family: 'Figtree', sans-serif;
    font-size: 13px; font-weight: 500;
    padding: 9px 16px; border-radius: 6px;
    border: 1px solid var(--tbev-border);
    background: var(--tbev-surface-subtle);
    color: var(--tbev-btn-ghost-text);
    transition: color .18s ease, background .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.tbev-btn:hover {
    color: var(--tbev-text);
    background: var(--tbev-surface-hover);
    border-color: var(--tbev-border-strong);
}
.tbev-btn:disabled { opacity: 0.6; cursor: progress; }
.tbev-btn-primary {
    background: var(--tbev-purple); border-color: var(--tbev-purple);
    color: #FFFFFF;
    box-shadow: 0 4px 14px rgba(99,91,255,0.20);
}
.tbev-btn-primary:hover {
    background: var(--tbev-purple-hover); border-color: var(--tbev-purple-hover);
    color: #FFFFFF;
}
.tbev-btn-secondary {
    background: rgba(34,197,94,0.10);
    border-color: rgba(34,197,94,0.45);
    color: #86EFAC;
}
.tbev-btn-secondary:hover {
    background: rgba(34,197,94,0.18);
    border-color: rgba(34,197,94,0.65);
    color: #BBF7D0;
}
.tbev-btn-ghost { /* default styling above already matches the ghost pattern */ }

/* Luci AI-generated content — section/cards/badges/tables.
   These rules style content_html emitted by the n8n schema so rendering
   doesn't look "cortada ao meio" or unstyled. */
/* Appended lesson tail from content_meta.exercises (viewer + caderno preview). */
.tbev-article .tbev-lesson-ex-hr { margin: 2em 0 1.2em; }
.tbev-article .tbev-lesson-exercises {
    margin: 0 0 2.5em;
    padding: 0 0 1rem;
}
.tbev-article .tbev-lesson-ex-head {
    font-family: 'Figtree', sans-serif;
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--tbev-text);
    margin: 0 0 0.5em;
}
.tbev-article .tbev-lesson-ex-hint {
    font-size: 14px;
    color: var(--tbev-muted);
    margin: 0 0 1.2em;
    line-height: 1.5;
}

.tbev-article .luci-lesson { display: block; }
.tbev-article .luci-section,
.tbev-article section.luci-section {
    background: var(--tbev-card);
    border: 1px solid var(--tbev-border);
    border-radius: 8px;
    padding: 18px 20px;
    margin: 1.2em 0;
}
.tbev-article .luci-section:not(.tbev-plan-week):not(.tbev-seq-lesson) {
    padding: 0;
    overflow: hidden;
}
.tbev-article .luci-section > h1,
.tbev-article .luci-section > h2,
.tbev-article .luci-section > h3 { margin-top: 0; }
.tbev-article .luci-section + .luci-section { margin-top: 1.4em; }
.tbev-article .luci-section {
    --luci-accent-rgb: 99, 91, 255;
    --luci-accent-text: var(--tbev-accent-soft);
}
.tbev-article .luci-section-head {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    margin: 0;
    padding: 10px 20px;
    box-sizing: border-box;
    font-family: 'Source Code Pro', monospace;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--luci-accent-text);
    background: rgba(var(--luci-accent-rgb), 0.10);
    border-bottom: 1px solid rgba(var(--luci-accent-rgb), 0.30);
}
.tbev-article .luci-section-step {
    flex-shrink: 0;
    opacity: 0.85;
    font-weight: 700;
}
.tbev-article .luci-section-step::after {
    content: '·';
    margin: 0 0.35em;
    opacity: 0.55;
}
.tbev-article .luci-section-badge {
    display: inline;
    padding: 0;
    border: none;
    border-radius: 0;
    background: transparent;
    font: inherit;
    color: inherit;
}
.tbev-article .luci-section-body {
    padding: 18px 20px;
    margin: 0;
}
.tbev-article .luci-lesson > .luci-section:last-child .luci-section-body {
    padding-bottom: 22px;
}
.tbev-article .luci-lesson {
    padding-bottom: 1.5rem;
}
.tbev-article .luci-section-primitives {
    padding: 0 20px 18px;
    margin: 0;
}
.tbev-article .luci-section-body + .luci-section-primitives {
    padding-top: 0;
}
.tbev-article .luci-section:not(:has(.luci-section-body)) .luci-section-primitives {
    padding-top: 18px;
}
.tbev-article .luci-roleplay-block {
    margin-bottom: 1rem;
    border: 1px solid rgba(99, 91, 255, 0.18);
    border-radius: 8px;
    overflow: hidden;
    background: rgba(99, 91, 255, 0.04);
}
.tbev-article .luci-roleplay-block:last-child { margin-bottom: 0; }
.tbev-article .luci-roleplay-label {
    font-family: 'Source Code Pro', monospace;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--tbev-accent-soft);
    padding: 8px 14px;
    background: rgba(99, 91, 255, 0.10);
    border-bottom: 1px solid rgba(99, 91, 255, 0.18);
}
.tbev-article .luci-roleplay-content {
    padding: 12px 16px;
}
.tbev-article .luci-roleplay-intro {
    margin-bottom: 1rem;
}
.tbev-article .luci-section--dialogue-and-content .luci-section-body,
.tbev-article .luci-section--dialogue-content .luci-section-body {
    background: var(--tbev-surface-inset);
    border-left: 3px solid rgba(99,91,255,0.45);
    border-radius: 0 8px 8px 0;
    padding: 18px 20px;
    margin: 0;
}
.tbev-article .luci-section--dialogue-and-content:last-child .luci-section-body,
.tbev-article .luci-section--dialogue-content:last-child .luci-section-body {
    padding-bottom: 22px;
}
.tbev-article .luci-section--dialogue-and-content .luci-section-head + .luci-section-body,
.tbev-article .luci-section--dialogue-content .luci-section-head + .luci-section-body {
    margin-top: 18px;
}
.tbev-article .luci-section--put-it-into-practice .luci-section-body:not(:has(.luci-roleplay-block)),
.tbev-article .luci-section--put-it-into-practice-roleplays .luci-section-body:not(:has(.luci-roleplay-block)) {
    background: rgba(99,91,255,0.04);
    border: 1px solid rgba(99,91,255,0.18);
    border-radius: 8px;
    padding: 12px 16px;
    margin: 0 20px 18px;
}
.tbev-article .luci-section--put-it-into-practice .luci-section-head + .luci-section-body,
.tbev-article .luci-section--put-it-into-practice-roleplays .luci-section-head + .luci-section-body {
    margin-top: 18px;
}
/* Per-section accent — CSS fallback; JS sets --luci-accent-rgb on each section */
.tbev-article .luci-section--warm-up,
.tbev-article .luci-section--warm-up-questions {
    --luci-accent-rgb: 212, 175, 55;
    --luci-accent-text: #F5E6A8;
    border-left: 3px solid rgba(212, 175, 55, 0.65);
}
.tbev-article .luci-section--learning-objectives {
    --luci-accent-rgb: 230, 57, 70;
    --luci-accent-text: #FECACA;
    border-left: 3px solid rgba(230, 57, 70, 0.45);
}
.tbev-article .luci-section--dialogue,
.tbev-article .luci-section--dialogue-and-content,
.tbev-article .luci-section--dialogue-content,
.tbev-article [class*="luci-section--dialogue"] {
    --luci-accent-rgb: 56, 189, 248;
    --luci-accent-text: #BAE6FD;
    border-left: 3px solid rgba(56, 189, 248, 0.55);
}
.tbev-article .luci-section--strategic-analysis,
.tbev-article [class*="luci-section--strategic-analysis"] {
    --luci-accent-rgb: 74, 222, 128;
    --luci-accent-text: #BBF7D0;
    border-left: 3px solid rgba(74, 222, 128, 0.45);
}
.tbev-article .luci-section--language-focus,
.tbev-article .luci-section--language-focus-drilling,
.tbev-article [class*="luci-section--language-focus"] {
    --luci-accent-rgb: 45, 212, 191;
    --luci-accent-text: #99F6E4;
    border-left: 3px solid rgba(45, 212, 191, 0.55);
}
.tbev-article .luci-section--drilling,
.tbev-article .luci-section--application,
.tbev-article .luci-section--skills-practice,
.tbev-article [class*="luci-section--application"],
.tbev-article [class*="luci-section--skills-practice"] {
    --luci-accent-rgb: 168, 85, 247;
    --luci-accent-text: #E9D5FF;
    border-left: 3px solid rgba(168, 85, 247, 0.50);
}
.tbev-article .luci-section--business-insight,
.tbev-article .luci-section--case-study,
.tbev-article [class*="luci-section--business-insight"],
.tbev-article [class*="luci-section--case-study"] {
    --luci-accent-rgb: 244, 114, 182;
    --luci-accent-text: #FBCFE8;
    border-left: 3px solid rgba(244, 114, 182, 0.50);
}
.tbev-article .luci-section--discussion,
.tbev-article .luci-section--discussion-anchored,
.tbev-article .luci-section--discussion-closed,
.tbev-article [class*="luci-section--discussion"] {
    --luci-accent-rgb: 99, 102, 241;
    --luci-accent-text: #A5B4FC;
    border-left: 3px solid rgba(99, 102, 241, 0.55);
}
.tbev-article .luci-section--put-it-into-practice,
.tbev-article .luci-section--put-it-into-practice-roleplays,
.tbev-article [class*="luci-section--put-it-into-practice"],
.tbev-article [class*="luci-section--scenario"] {
    --luci-accent-rgb: 99, 91, 255;
    --luci-accent-text: var(--tbev-accent-soft);
    border-left: 3px solid rgba(99, 91, 255, 0.70);
}
.tbev-article .luci-section--key-takeaways,
.tbev-article [class*="luci-section--key-takeaways"] {
    --luci-accent-rgb: 251, 191, 36;
    --luci-accent-text: #FDE68A;
    border-left: 3px solid rgba(251, 191, 36, 0.55);
}
.tbev-plan-mission { color: var(--tbev-muted); margin-bottom: 1rem; line-height: 1.6; }
.tbev-article .luci-badge,
.tbev-article [data-luci-badge] {
    display: inline-block;
    font-family: 'Source Code Pro', monospace;
    font-size: 11px; font-weight: 600;
    letter-spacing: 0.05em; text-transform: uppercase;
    padding: 3px 8px; border-radius: 4px;
    background: rgba(99,91,255,0.10);
    color: var(--tbev-accent-soft);
    border: 1px solid rgba(99,91,255,0.30);
    margin: 0 4px 6px 0;
}
.tbev-article .luci-callout {
    background: rgba(var(--luci-accent-rgb), 0.05);
    border: 1px solid rgba(var(--luci-accent-rgb), 0.25);
    border-left: 3px solid rgb(var(--luci-accent-rgb));
    border-radius: 0 8px 8px 0;
    padding: 12px 16px;
    margin: 1.2em 0;
    color: var(--tbev-text);
}
.tbev-article table {
    width: 100%; border-collapse: collapse;
    background: var(--tbev-panel);
    border: 1px solid var(--tbev-border);
    border-radius: 8px; overflow: hidden;
    margin: 1.2em 0;
}
.tbev-article table th,
.tbev-article table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--tbev-border);
    text-align: left; vertical-align: top;
    font-size: 14px;
}
.tbev-article table th {
    background: rgba(255,255,255,0.03);
    font-family: 'Figtree', sans-serif;
    font-weight: 600; color: var(--tbev-text);
}
.tbev-article table tr:last-child td { border-bottom: 0; }
.tbev-article .luci-vocab,
.tbev-article .vocab-table { font-size: 13px; }
.tbev-article .luci-truncated {
    display: block; margin: 1.2em 0;
    padding: 10px 14px;
    background: rgba(230,57,70,0.08);
    border: 1px dashed rgba(230,57,70,0.40);
    color: #FECACA;
    border-radius: 6px;
    font-family: 'Source Code Pro', monospace; font-size: 12px;
}

/* Wide reading column for pre-attach review of long AI lessons. */
.tbev-article.tbev-wide { max-width: 1100px; }

/* Verdadeiro / Falso grouped card */
.tbev-q.tbev-q-tf .tbev-tf-list { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; }
.tbev-tf-row {
    display: flex; align-items: center; gap: 12px;
    padding: 10px 14px;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--tbev-border);
    border-radius: 6px;
}
.tbev-tf-text { flex: 1 1 auto; color: var(--tbev-text); font-size: 14px; line-height: 1.5; }
.tbev-tf-pills { display: inline-flex; gap: 6px; flex: 0 0 auto; }
.tbev-tf-pill {
    cursor: pointer;
    font-family: 'Source Code Pro', monospace; font-size: 12px; font-weight: 600;
    letter-spacing: 0.05em;
    width: 36px; height: 30px;
    border-radius: 6px;
    border: 1px solid var(--tbev-border);
    background: rgba(255,255,255,0.02);
    color: #D1D5DB;
    transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.tbev-tf-pill:hover { background: rgba(255,255,255,0.05); border-color: var(--tbev-border-strong); color: var(--tbev-text); }
.tbev-tf-row [data-luci-opt].tbev-opt-selected,
.tbev-tf-pill.tbev-opt-selected {
    background: rgba(99,91,255,0.12);
    border-color: rgba(99,91,255,0.55);
    color: #FFFFFF;
    box-shadow: 0 0 0 1px rgba(99,91,255,0.18) inset;
}
.tbev-tf-pill.tbev-opt-correct {
    border-color: rgba(34,197,94,0.55); background: rgba(34,197,94,0.10); color: #BBF7D0;
}
.tbev-tf-pill.tbev-opt-wrong,
.tbev-tf-pill.tbev-opt-incorrect {
    border-color: rgba(230,57,70,0.55); background: rgba(230,57,70,0.10); color: #FECACA;
}
.tbev-article .tbev-tf-pills [data-luci-opt].tbev-tf-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 30px;
    margin: 0;
    padding: 0;
    line-height: 1;
    text-align: center;
}

/* ── Teacher side panel — notes / feedback / blocks (escopo 2.6, 2.7, 2.8) ── */
.tbev-body { display: block; }
.tbev-body[data-has-side="1"] {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 24px;
    align-items: stretch;
    min-height: 0;
    overflow-y: auto;
}
.tbev-body[data-has-side="1"] .tbev-article {
    min-height: 0;
    overflow-y: visible;
    max-height: none;
}
.tbev-side {
    position: sticky; top: 0;
    align-self: start;
    display: flex; flex-direction: column; gap: 14px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding-left: 4px;
}
.tbev-side-block {
    background: var(--tbev-panel);
    border: 1px solid var(--tbev-border);
    border-radius: 8px;
    padding: 12px 14px;
}
.tbev-side-h {
    display: flex; align-items: center; justify-content: space-between;
    gap: 8px; margin-bottom: 8px;
}
.tbev-side-badge {
    font-family: 'Source Code Pro', monospace;
    font-size: 11px; font-weight: 600;
    letter-spacing: 0.05em; text-transform: uppercase;
    color: var(--tbev-accent-soft);
}
.tbev-side-status { font-family: 'Source Code Pro', monospace; font-size: 10px; color: var(--tbev-muted); }
#tbev-notes {
    width: 100%; min-height: 140px; resize: vertical;
    background: var(--tbev-input-bg);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 6px;
    color: var(--tbev-text);
    font-family: 'Figtree', sans-serif; font-size: 13px; line-height: 1.55;
    padding: 10px 12px;
}
#tbev-notes:focus { border-color: var(--tbev-purple); outline: none; }

.tbev-side-block[data-block="feedback"] {
    display: flex;
    flex-direction: column;
    min-height: 0;
    max-height: 42vh;
}
.tbev-feedback-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto;
    min-height: 0;
    flex: 1 1 auto;
}
.tbev-structure-summary { color: var(--tbev-muted); margin-bottom: 1rem; line-height: 1.6; }
.tbev-plan-week h3, .tbev-seq-lesson h3 {
    font-size: 1.05rem;
    margin: 0 0 0.5rem;
    color: var(--tbev-text);
}
.tbev-feedback-col {
    background: var(--tbev-card);
    border: 1px solid var(--tbev-border);
    border-radius: 6px;
    padding: 10px 12px;
}
.tbev-fb-tag { display: inline-block; margin-bottom: 6px; }
.tbev-fb-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.tbev-fb-list li {
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--tbev-border);
    border-radius: 4px;
    padding: 6px 8px;
    color: var(--tbev-text);
    font-size: 12px; line-height: 1.4;
    display: flex; align-items: flex-start; gap: 6px;
}
.tbev-fb-list li [contenteditable] { flex: 1 1 auto; outline: none; min-width: 0; }
.tbev-fb-list li .tbev-fb-del {
    cursor: pointer; background: none; border: 0; color: var(--tbev-muted);
    font-size: 14px; line-height: 1; padding: 0 2px;
}
.tbev-fb-list li .tbev-fb-del:hover { color: var(--tbev-fire); }
.tbev-fb-add {
    margin-top: 6px;
    background: none; border: 0; cursor: pointer;
    color: var(--tbev-muted);
    font-family: 'Source Code Pro', monospace; font-size: 10px;
    letter-spacing: 0.05em; text-transform: uppercase;
}
.tbev-fb-add:hover { color: var(--tbev-purple); }

.tbev-notion-blocks { display: flex; flex-direction: column; gap: 8px; }
.tbev-notion-block {
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--tbev-border);
    border-radius: 4px;
    padding: 8px 10px;
    color: var(--tbev-text);
    font-size: 13px; line-height: 1.55;
    outline: none; min-height: 28px;
}
.tbev-notion-block:focus { border-color: var(--tbev-purple); }

@media (max-width: 980px) {
    .tbev-body[data-has-side="1"] { display: block; }
    .tbev-side { position: static; max-height: none; padding-left: 0; margin-top: 18px; }
}

/* Didactic layout blocks (Luci v22) */
.tbev-article .luci-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin: 1.2em 0;
}
.tbev-article .luci-stat-card {
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--tbev-border);
    border-radius: 8px;
    padding: 14px 16px;
    text-align: center;
}
.tbev-article .luci-stat-value {
    display: block;
    font-family: 'Source Code Pro', monospace;
    font-size: 22px;
    font-weight: 600;
    color: var(--tbev-accent-soft);
    line-height: 1.2;
}
.tbev-article .luci-stat-label {
    display: block;
    font-size: 12px;
    color: var(--tbev-muted);
    margin-top: 4px;
}
.tbev-article .luci-example {
    background: rgba(99,91,255,0.06);
    border: 1px solid rgba(99,91,255,0.2);
    border-left: 3px solid var(--tbev-purple);
    border-radius: 0 8px 8px 0;
    padding: 12px 16px;
    margin: 1em 0;
    font-size: 14px;
    line-height: 1.55;
}
.tbev-article .luci-example::before {
    content: '→ ';
    font-family: 'Source Code Pro', monospace;
    font-weight: 600;
    color: var(--tbev-accent-soft);
}
.tbev-article .luci-word-bank,
.tbev-article .tbev-word-bank {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 0 12px;
    padding: 10px 12px;
    background: var(--tbev-input-bg);
    border: 1px dashed var(--tbev-border);
    border-radius: 8px;
}
.tbev-article .luci-word-chip {
    font-family: 'Source Code Pro', monospace;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 6px;
    background: rgba(99,91,255,0.12);
    border: 1px solid rgba(99,91,255,0.35);
    color: var(--tbev-purple);
}
.tbev-article .luci-word-bank--tooltip {
    overflow: visible;
}
.tbev-article .luci-word-bank--tooltip .luci-word-chip {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 10px 12px;
    cursor: help;
    text-align: center;
}
.tbev-article .luci-word-bank--tooltip .luci-word-term {
    display: block;
}
.tbev-article .luci-word-bank--tooltip .luci-word-def {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    z-index: 30;
    min-width: 180px;
    max-width: 260px;
    padding: 10px 12px;
    font-family: 'Figtree', sans-serif;
    font-size: 13px;
    font-weight: 400;
    line-height: 1.5;
    color: #D1D5DB;
    text-align: left;
    background: var(--tbev-card);
    border: 1px solid rgba(99,91,255,0.35);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.45);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateX(-50%) translateY(6px);
    transition: opacity .18s ease, transform .18s ease, visibility .18s ease;
}
.tbev-article .luci-word-bank--tooltip .luci-word-chip:hover .luci-word-def,
.tbev-article .luci-word-bank--tooltip .luci-word-chip:focus-within .luci-word-def {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}
@media (prefers-reduced-motion: reduce) {
    .tbev-article .luci-word-bank--tooltip .luci-word-def {
        transition: none;
    }
}
.tbev-article .luci-chart {
    margin: 1.4em 0;
    padding: 14px 16px;
    background: var(--tbev-panel);
    border: 1px solid var(--tbev-border);
    border-radius: 8px;
}
.tbev-article .luci-chart-svg { width: 100%; max-width: 360px; height: auto; display: block; }
.tbev-article .luci-chart-title { fill: var(--tbev-text); font-size: 11px; font-family: 'Figtree', sans-serif; font-weight: 600; }
.tbev-article .luci-chart-lbl { fill: var(--tbev-muted); font-size: 10px; font-family: 'Source Code Pro', monospace; }
.tbev-article .luci-chart-bar { fill: rgba(99,91,255,0.65); }
.tbev-article .luci-chart-track { fill: var(--tbev-chart-track); }
.tbev-article .luci-chart-fill { fill: rgba(99,91,255,0.75); }
.tbev-article .luci-chart-pct { fill: var(--tbev-chart-pct); font-size: 11px; font-family: 'Source Code Pro', monospace; }
.tbev-article details.luci-answer-key {
    margin-top: 1.6em;
    border: 1px solid var(--tbev-border);
    border-radius: 8px;
    background: var(--tbev-answer-key-bg);
}
.tbev-article details.luci-answer-key summary {
    cursor: pointer;
    padding: 12px 16px;
    font-family: 'Source Code Pro', monospace;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--tbev-accent-soft);
}
.tbev-article details.luci-answer-key:not(.luci-answer-key--vault)[open] > :not(summary) { padding: 0 16px 14px; }

.tbev-ex-block-title {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin: 0 0 12px;
    color: var(--tbev-text);
}
.tbev-exercise-block + .tbev-exercise-block { margin-top: 1.6em; }

.tbev-matching { display: flex; flex-direction: column; gap: 10px; }
.tbev-match-row {
    display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
    padding: 10px 12px;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--tbev-border);
    border-radius: 6px;
}
.tbev-match-left { flex: 1 1 180px; font-size: 14px; color: var(--tbev-text); }
.tbev-match-select {
    flex: 0 1 200px; min-width: 140px;
    background: rgba(0,0,0,0.25);
    border: 1px solid var(--tbev-border);
    border-radius: 6px;
    color: var(--tbev-text);
    padding: 8px 10px;
    font-size: 14px;
}
.tbev-matching.tbev-match-correct { outline: 1px solid rgba(34,197,94,0.4); border-radius: 8px; }
.tbev-matching.tbev-match-wrong { outline: 1px solid rgba(230,57,70,0.4); border-radius: 8px; }

.tbev-ec-stmt { margin: 0 0 10px; font-size: 14px; line-height: 1.5; }
.tbev-ec-input { width: 100%; max-width: 480px; }

.tbev-ordering { margin-top: 4px; }
.tbev-order-hint { font-size: 12px; color: var(--tbev-muted); margin: 0 0 10px; }
.tbev-order-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.tbev-order-item {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 12px;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--tbev-border);
    border-radius: 6px;
    cursor: grab;
}
.tbev-order-text { flex: 1; font-size: 14px; }
.tbev-order-actions { display: flex; gap: 4px; }
.tbev-order-up, .tbev-order-down {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px; height: 28px;
    padding: 0;
    line-height: 1;
    border: 1px solid var(--tbev-border);
    border-radius: 6px;
    background: rgba(255,255,255,0.03);
    color: #D1D5DB;
    cursor: pointer;
    font-size: 12px;
}
.tbev-ordering.tbev-order-correct .tbev-order-list { border: 1px solid rgba(34,197,94,0.35); border-radius: 8px; padding: 6px; }
.tbev-ordering.tbev-order-wrong .tbev-order-list { border: 1px solid rgba(230,57,70,0.35); border-radius: 8px; padding: 6px; }

.tbev-categorize { display: flex; flex-direction: column; gap: 8px; }
.tbev-cat-row {
    display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
    padding: 8px 12px;
    border: 1px solid var(--tbev-border);
    border-radius: 6px;
    background: rgba(255,255,255,0.02);
}
.tbev-cat-label { flex: 1 1 160px; font-size: 14px; }
.tbev-cat-select {
    flex: 0 1 180px; min-width: 120px;
    background: rgba(0,0,0,0.25);
    border: 1px solid var(--tbev-border);
    border-radius: 6px;
    color: var(--tbev-text);
    padding: 8px 10px;
}

.tbev-prompt-src, .tbev-prompt-inst, .tbev-prompt-hint { font-size: 14px; margin: 0 0 8px; color: var(--tbev-muted); }
.tbev-oral-scenario { font-size: 14px; line-height: 1.55; margin: 0 0 10px; }
.tbev-oral-checklist { margin: 0 0 12px; padding-left: 18px; font-size: 13px; color: var(--tbev-muted); }
.tbev-article .tbev-mini-dlg {
    margin: 0 0 12px;
    padding: 10px 12px;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--tbev-border);
    border-radius: 6px;
    font-size: 14px;
    line-height: 1.55;
    color: var(--tbev-text);
}
.tbev-article .tbev-mini-dlg b,
.tbev-article .tbev-mini-dlg strong { font-weight: 600; }
.tbev-odd-group { margin-bottom: 14px; }
.tbev-odd-label { font-size: 12px; color: var(--tbev-muted); margin: 0 0 6px; font-family: 'Source Code Pro', monospace; }

/* ── Interactive didactic blocks (v22 layout) ── */

.tbev-article .luci-callout--inset {
    margin: 1.2em 0;
    width: auto;
    background: var(--tbev-card);
    border: 1px solid var(--tbev-border-strong);
    border-left: 3px solid rgb(var(--luci-accent-rgb));
    border-radius: 8px;
    padding: 18px 20px;
    box-sizing: border-box;
}
.tbev-article .luci-callout--inset p { margin: 0 0 0.6em; }
.tbev-article .luci-callout--inset p:last-child { margin-bottom: 0; }
.tbev-article .luci-callout--inset::before {
    content: '[ RULE ]';
    display: block;
    font-family: 'Source Code Pro', monospace;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--tbev-accent-soft);
    margin-bottom: 8px;
}

.tbev-article .luci-info-grid {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 14px;
}
.tbev-article .luci-stat-card {
    text-align: left;
    padding: 16px 18px;
    transition: background .18s ease, border-color .18s ease;
}
.tbev-article .luci-stat-card:hover {
    background: var(--tbev-surface-hover);
    border-color: var(--tbev-border-strong);
}
.tbev-article .luci-stat-value {
    font-size: 26px;
    color: var(--tbev-text);
}
.tbev-article .luci-stat-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-family: 'Source Code Pro', monospace;
}

.tbev-article .luci-word-bank--bento-4 {
    grid-template-columns: repeat(4, 1fr);
}
.tbev-article .luci-word-bank--bento-4 .luci-bento-card {
    min-height: 88px;
    align-content: start;
}
.tbev-article .luci-application-grid {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-top: 8px;
}
.tbev-article .luci-app-exercise-card {
    background: var(--tbev-card);
    border: 1px solid var(--tbev-border);
    border-radius: 8px;
    padding: 14px 16px;
}
.tbev-article .luci-app-exercise-badge {
    font-family: 'Source Code Pro', monospace;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--tbev-accent-badge);
    margin-bottom: 10px;
}
.tbev-article .luci-app-exercise-body {
    font-size: 15px;
    line-height: 1.6;
    color: var(--tbev-text);
}
.tbev-article .luci-app-exercise-instruct {
    margin: 0 0 12px;
    font-size: 14px;
    line-height: 1.55;
    color: var(--tbev-muted);
}
.tbev-article .luci-app-exercise-body p { margin: 0 0 0.65em; }
.tbev-article .luci-app-exercise-body ul,
.tbev-article .luci-app-exercise-body ol { margin: 0 0 0.65em; padding-left: 1.25em; }
.tbev-article .luci-match-cols {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 4px;
}
.tbev-article .luci-match-col {
    padding: 12px 14px;
    background: var(--tbev-surface-subtle);
    border: 1px solid var(--tbev-border);
    border-radius: 8px;
}
.tbev-article .luci-match-col ul,
.tbev-article .luci-match-col ol {
    margin: 0;
    padding-left: 1.2em;
}
@media (max-width: 640px) {
    .tbev-article .luci-match-cols { grid-template-columns: 1fr; }
}

.tbev-article .luci-md-table {
    width: 100%;
    border-collapse: collapse;
    margin: 0.75em 0 1em;
    font-size: 14px;
}
.tbev-article .luci-md-table th,
.tbev-article .luci-md-table td {
    border: 1px solid var(--tbev-border);
    padding: 8px 10px;
    text-align: left;
    vertical-align: top;
}
.tbev-article .luci-md-table th {
    background: var(--tbev-surface-subtle);
    font-family: 'Source Code Pro', monospace;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}
.tbev-article .luci-exercise-head {
    margin: 1.1em 0 0.45em;
    font-weight: 600;
}
.tbev-article .luci-exercise-head:first-child { margin-top: 0; }
.tbev-article details.luci-answer-key--vault .luci-answer-key-panel ol,
.tbev-article details.luci-answer-key--vault .luci-answer-key-panel ul {
    margin: 0 0 0.85em;
    padding-left: 1.25em;
}
.tbev-article details.luci-answer-key--vault .luci-answer-key-panel .luci-exercise-head {
    margin-top: 1.15em;
    color: var(--tbev-text);
}

.tbev-article .luci-word-bank--bento {
    display: grid;
    gap: 10px;
    padding: 14px;
    background: var(--tbev-input-bg);
    border: 1px solid var(--tbev-border);
    border-radius: 8px;
}
.tbev-article .luci-word-bank--uniform:not(.luci-word-bank--bento-4):not(.luci-word-bank--bento-5) {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 140px), 1fr));
}
.tbev-article .luci-word-bank--bento-5 {
    grid-template-columns: repeat(5, minmax(0, 1fr));
}
@media (max-width: 900px) {
    .tbev-article .luci-word-bank--bento-5 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .tbev-article .luci-word-bank--bento-5 .luci-bento-card:nth-child(5):last-child {
        grid-column: 1 / -1;
    }
}
@media (max-width: 720px) {
    .tbev-article .luci-word-bank--bento:not(.luci-word-bank--bento-4):not(.luci-word-bank--bento-5) {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}
.tbev-article .luci-bento-card {
    display: grid;
    grid-template-rows: auto 0fr;
    gap: 0;
    padding: 12px 14px;
    background: var(--tbev-card);
    border: 1px solid var(--tbev-border);
    border-radius: 8px;
    cursor: pointer;
    overflow: hidden;
    transition: grid-template-rows .28s ease, border-color .18s ease, background .18s ease;
}
.tbev-article .luci-word-bank--flat .luci-bento-card {
    grid-template-rows: auto 1fr;
    cursor: default;
    min-height: 72px;
    align-content: start;
}
.tbev-article .luci-word-bank--flat .luci-bento-def {
    padding-top: 8px;
}
.tbev-article .luci-bento-term {
    font-family: 'Source Code Pro', monospace;
    font-size: 13px;
    font-weight: 600;
    color: var(--tbev-accent-term);
}
.tbev-article .luci-bento-def {
    min-height: 0;
    overflow: hidden;
    font-size: 13px;
    line-height: 1.5;
    color: var(--tbev-muted);
    padding-top: 0;
    transition: padding-top .28s ease;
}
.tbev-article .luci-bento-card.is-expanded,
.tbev-article .luci-bento-card:hover,
.tbev-article .luci-bento-card:focus-within {
    grid-template-rows: auto 1fr;
    border-color: rgba(99,91,255,0.35);
    background: rgba(99,91,255,0.06);
}
.tbev-article .luci-bento-card.is-expanded .luci-bento-def,
.tbev-article .luci-bento-card:hover .luci-bento-def,
.tbev-article .luci-bento-card:focus-within .luci-bento-def {
    padding-top: 8px;
}
@media (prefers-reduced-motion: reduce) {
    .tbev-article .luci-bento-card {
        grid-template-rows: auto 1fr;
        transition: none;
    }
    .tbev-article .luci-bento-def { padding-top: 8px; }
}

.tbev-article details.luci-answer-key--vault {
    margin-top: 2em;
    border: 1px solid var(--tbev-border-strong);
    border-radius: 8px;
    background: var(--tbev-answer-key-vault-bg);
    overflow: hidden;
}
.tbev-article details.luci-answer-key--vault summary {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 18px;
    cursor: pointer;
}
.tbev-article details.luci-answer-key--vault summary::-webkit-details-marker { display: none; }
.tbev-article details.luci-answer-key--vault summary::before {
    content: '🔒';
    font-size: 14px;
    opacity: 0.85;
}
.tbev-article .luci-answer-key-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height .32s ease, padding .32s ease;
    padding: 0;
    margin: 0;
}
.tbev-article details.luci-answer-key--vault:not(.is-open) .luci-answer-key-panel {
    max-height: 0 !important;
    padding: 0 !important;
    overflow: hidden;
}
.tbev-article details.luci-answer-key--vault:not(.is-open) > :not(summary) {
    padding: 0 !important;
}
.tbev-article details.luci-answer-key--vault.is-open .luci-answer-key-panel {
    padding: 0 18px 16px;
}
.tbev-article details.luci-answer-key--vault .luci-answer-key-panel > :first-child {
    margin-top: 0;
}
.tbev-article details.luci-answer-key--vault .luci-answer-key-panel p {
    margin: 0 0 0.65em;
}
.tbev-article details.luci-answer-key--vault .luci-answer-key-panel p:last-child {
    margin-bottom: 0;
}
@media (prefers-reduced-motion: reduce) {
    .tbev-article .luci-answer-key-panel { transition: none; }
}

.tbev-article .luci-roleplay-widget {
    border: 1px solid rgba(99,91,255,0.25);
    border-radius: 8px;
    overflow: hidden;
    background: rgba(99,91,255,0.04);
}
.tbev-article .luci-roleplay-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid rgba(99,91,255,0.2);
    background: rgba(99,91,255,0.08);
}
.tbev-article .luci-roleplay-tab {
    flex: 1;
    padding: 10px 16px;
    border: 0;
    background: transparent;
    color: var(--tbev-muted);
    font-family: 'Figtree', sans-serif;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background .15s ease, color .15s ease;
}
.tbev-article .luci-roleplay-tab.is-active {
    background: rgba(var(--luci-accent-rgb), 0.15);
    color: var(--tbev-text);
    box-shadow: inset 0 -2px 0 rgb(var(--luci-accent-rgb));
}
.tbev-article .luci-roleplay-pane {
    padding: 14px 18px;
    font-size: 14px;
    line-height: 1.55;
    transition: opacity .22s ease;
}
.tbev-article .luci-roleplay-pane[hidden] { display: none; }
.tbev-article .luci-roleplay-pane hr { display: none; }

.tbev-article .luci-dialogue-intro {
    margin: 0 0 1em;
    font-size: 15px;
    line-height: 1.55;
    color: var(--tbev-text);
}
.tbev-article .luci-dialogue-context {
    display: block;
    background: rgba(var(--luci-accent-rgb), 0.16);
    border: 1px solid rgba(var(--luci-accent-rgb), 0.45);
    border-left: 4px solid rgb(var(--luci-accent-rgb));
    border-radius: 8px;
    padding: 14px 16px;
    margin: 0 0 14px;
    box-shadow: 0 0 0 1px rgba(var(--luci-accent-rgb), 0.15) inset,
                0 6px 20px rgba(0, 0, 0, 0.25);
}
.tbev-article .luci-dialogue-panel {
    margin: 0 0 1.2em;
    padding: 14px 16px;
    background: rgba(0,0,0,0.22);
    border: 1px solid rgba(var(--luci-accent-rgb), 0.25);
    border-radius: 8px;
}
.tbev-article .luci-dialogue-panel .luci-dialogue-context,
.tbev-article .luci-dialogue-panel .luci-dialogue-turn--context {
    display: none;
}
.tbev-article .luci-dialogue-context-label {
    font-family: 'Source Code Pro', monospace;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--luci-accent-text);
    margin-bottom: 8px;
}
.tbev-article .luci-dialogue-context p {
    margin: 0 0 0.5em;
    text-align: left;
    color: var(--tbev-text);
}
.tbev-article .luci-dialogue-context p:last-child { margin-bottom: 0; }
.tbev-article .luci-dialogue-thread {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin: 0;
}
.tbev-article .luci-dialogue-turn {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.tbev-article .luci-dialogue-turn:last-child { border-bottom: 0; padding-bottom: 0; }
.tbev-article .luci-dialogue-speaker {
    flex: 0 0 5.5rem;
    width: 5.5rem;
    font-family: 'Source Code Pro', monospace;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--luci-accent-text);
    text-align: left;
    line-height: 1.55;
}
.tbev-article .luci-dialogue-line {
    flex: 1 1 auto;
    min-width: 0;
    font-size: 14px;
    line-height: 1.55;
    color: var(--tbev-text);
    text-align: left;
}

.tbev-article .luci-analysis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin: 1em 0 1.2em;
}
.tbev-article .luci-analysis-card {
    background: var(--tbev-card);
    border: 1px solid rgba(var(--luci-accent-rgb), 0.22);
    border-top: 2px solid rgba(var(--luci-accent-rgb), 0.45);
    border-radius: 8px;
    padding: 14px 16px;
    align-self: start;
}
.tbev-article .luci-analysis-card-head {
    font-family: 'Source Code Pro', monospace;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--luci-accent-text);
    margin-bottom: 6px;
}
.tbev-article .luci-analysis-card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--tbev-text);
    margin-bottom: 8px;
    line-height: 1.4;
}
.tbev-article .luci-analysis-card-body { font-size: 14px; line-height: 1.55; }
.tbev-article .luci-analysis-card-body ul,
.tbev-article .luci-analysis-card-body ol { margin: 0 0 0.6em; padding-left: 1.2em; }

.tbev-article .luci-warmup-grid.luci-warmup-stack {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 1em 0 1.2em;
}
.tbev-article .luci-warmup-card {
    width: 100%;
    box-sizing: border-box;
    padding: 12px 14px;
    background: rgba(255,255,255,0.02);
    border: 1px solid rgba(var(--luci-accent-rgb), 0.45);
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.5;
}
.tbev-article .luci-objectives-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
    margin: 1em 0 1.2em;
}
.tbev-article .luci-objective-card {
    padding: 12px 14px;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--tbev-border);
    border-left: 3px solid rgb(var(--luci-accent-rgb));
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.5;
}
.tbev-article .luci-discussion-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 1em 0 1.2em;
}
.tbev-article .luci-discussion-card {
    padding: 12px 14px 12px 18px;
    background: rgba(var(--luci-accent-rgb), 0.04);
    border: 1px solid rgba(var(--luci-accent-rgb), 0.20);
    border-left: 3px solid rgb(var(--luci-accent-rgb));
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.5;
}
.tbev-article .luci-section--key-takeaways .luci-section-body,
.tbev-article .luci-section[class*="key-takeaways"] .luci-section-body {
    padding-bottom: 22px;
}
.tbev-article .luci-traffic-board {
    margin: 1em 0 0;
    padding: 16px 18px;
    background: rgba(var(--luci-accent-rgb), 0.05);
    border: 1px solid rgba(var(--luci-accent-rgb), 0.22);
    border-radius: 8px;
}
.tbev-article .luci-traffic-board-head {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px 16px;
    margin-bottom: 14px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(var(--luci-accent-rgb), 0.18);
}
.tbev-article .luci-traffic-board-title {
    font-family: 'Source Code Pro', monospace;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--luci-accent-text);
}
.tbev-article .luci-traffic-board-hint {
    font-size: 12px;
    color: var(--tbev-muted);
}
.tbev-article .luci-traffic-board-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.tbev-article .luci-traffic-board .luci-traffic-row {
    margin: 0;
    border-color: rgba(var(--luci-accent-rgb), 0.12);
}
.tbev-article details.luci-answer-key--vault {
    margin: 1.4em 0 0;
}
.tbev-article .luci-roleplay-twist-wrap { display: block; margin-top: 10px; }
.tbev-article .luci-roleplay-twist-btn {
    background: rgba(var(--luci-accent-rgb), 0.12);
    border: 1px solid rgba(var(--luci-accent-rgb), 0.35);
    color: var(--luci-accent-text);
    padding: 6px 12px;
    border-radius: 6px;
    font-family: 'Source Code Pro', monospace;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    cursor: pointer;
}
.tbev-article .luci-roleplay-twist-btn:hover { color: var(--tbev-text); border-color: rgba(99,91,255,0.55); }
.tbev-article .luci-roleplay-twist {
    display: block;
    margin: 8px 0 0;
    padding: 10px 12px;
    background: rgba(230,57,70,0.08);
    border: 1px solid rgba(230,57,70,0.25);
    border-radius: 6px;
    color: var(--tbev-pill-red-text);
    font-size: 14px;
    line-height: 1.5;
}
.tbev-article .luci-roleplay-twist[hidden] { display: none; }
.tbev-article .luci-roleplay-twist-wrap.is-revealed .luci-roleplay-twist { display: block; }

.tbev-article .luci-section-body > hr,
.tbev-article .luci-dialogue-panel hr,
.tbev-article .luci-traffic-board + hr,
.tbev-article hr + hr {
    display: none;
}
.tbev-article .luci-traffic-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px 16px;
    padding: 12px 14px;
    margin: 0 0 10px;
    background: var(--tbev-surface-subtle);
    border: 1px solid var(--tbev-border);
    border-radius: 8px;
}
.tbev-article .luci-traffic-objective {
    flex: 1 1 200px;
    margin: 0;
    font-size: 14px;
    line-height: 1.5;
    color: var(--tbev-text);
}
.tbev-article .luci-traffic-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    flex: 0 1 auto;
}
.tbev-article .luci-traffic-pill {
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--tbev-border);
    background: var(--tbev-surface-subtle);
    color: var(--tbev-muted);
    font-family: 'Figtree', sans-serif;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.tbev-article .luci-traffic-pill--red.is-active {
    background: rgba(230,57,70,0.15);
    border-color: rgba(230,57,70,0.45);
    color: var(--tbev-pill-red-text);
}
.tbev-article .luci-traffic-pill--yellow.is-active {
    background: rgba(234,179,8,0.12);
    border-color: rgba(234,179,8,0.4);
    color: var(--tbev-pill-yellow-text);
}
.tbev-article .luci-traffic-pill--green.is-active {
    background: rgba(34,197,94,0.12);
    border-color: rgba(34,197,94,0.45);
    color: var(--tbev-pill-green-text);
}

/* Student portal — submitted exercise feedback */
.tbev-student-results {
    margin: 1rem 0 0;
    padding: 1rem 1.25rem;
    border: 1px solid var(--tbev-border);
    border-radius: 8px;
    background: rgba(99, 91, 255, 0.06);
}
.tbev-student-results-title {
    margin: 0 0 0.5rem;
    font-family: 'Figtree', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--tbev-text);
}
.tbev-student-score { margin: 0 0 0.75rem; font-size: 14px; color: var(--tbev-muted); }
.tbev-student-score strong { color: var(--tbev-text); }
.tbev-student-fb-block { margin-top: 0.75rem; }
.tbev-student-fb-block p,
.tbev-student-fb-block ul { margin: 0.35rem 0 0; font-size: 13px; color: var(--tbev-btn-ghost-text); line-height: 1.5; }
.tbev-student-fb-block ul { padding-left: 1.1rem; }
.tbev-article.tbev-student-locked { opacity: 0.85; pointer-events: none; user-select: none; }

/* Mobile tuning */
@media (max-width: 720px) {
    .tbev-overlay { padding: 0; }
    .tbev-shell { max-width: 100%; max-height: 100%; border-radius: 0; height: 100%; }
    .tbev-body { padding: 22px 18px 40px; }
    .tbev-article { font-size: 15px; }
}

/* Light theme — viewer shell + readable lesson body (accent text set in JS) */
html[data-tbe-theme="light"] .tbev-overlay {
    background: rgba(255, 255, 255, 0.72);
}
html[data-tbe-theme="light"] .tbev-shell {
    background: #ffffff;
    border-color: rgba(0, 0, 0, 0.08);
}
html[data-tbe-theme="light"] .tbev-head,
html[data-tbe-theme="light"] .tbev-foot {
    background: #f9fafb;
    border-color: rgba(0, 0, 0, 0.08);
}
html[data-tbe-theme="light"] .tbev-article,
html[data-tbe-theme="light"] .tbev-article .luci-section-body,
html[data-tbe-theme="light"] .tbev-article .luci-dialogue-line,
html[data-tbe-theme="light"] .tbev-article .luci-dialogue-context p {
    color: #1f2937;
}
html[data-tbe-theme="light"] .tbev-article .luci-section-head h2,
html[data-tbe-theme="light"] .tbev-article .luci-section-head h3 {
    color: var(--luci-accent-text, #111827);
}

/* Light tokens — must live in this file (loads after tbe-theme.css) */
html[data-tbe-theme="light"] {
    --tbev-canvas: #f4f5f7;
    --tbev-panel: #ffffff;
    --tbev-card: #ffffff;
    --tbev-text: #111827;
    --tbev-muted: #6b7280;
    --tbev-disabled: #9ca3af;
    --tbev-purple: #635bff;
    --tbev-purple-hover: #4f46e5;
    --tbev-fire: #e63946;
    --tbev-border: rgba(0, 0, 0, 0.08);
    --tbev-border-strong: rgba(0, 0, 0, 0.12);
    --tbev-input-bg: rgba(0, 0, 0, 0.04);
    --tbev-surface-inset: rgba(0, 0, 0, 0.04);
    --tbev-surface-hover: rgba(0, 0, 0, 0.04);
    --tbev-surface-subtle: rgba(0, 0, 0, 0.03);
    --tbev-surface-muted: rgba(0, 0, 0, 0.04);
    --tbev-accent-soft: #4338ca;
    --tbev-accent-term: #3730a3;
    --tbev-accent-badge: #4f46e5;
    --tbev-btn-ghost-text: #4b5563;
    --tbev-chart-track: rgba(0, 0, 0, 0.08);
    --tbev-chart-pct: #4338ca;
    --tbev-answer-key-bg: rgba(99, 91, 255, 0.06);
    --tbev-answer-key-vault-bg: rgba(99, 91, 255, 0.08);
    --tbev-pill-red-text: #b91c1c;
    --tbev-pill-yellow-text: #a16207;
    --tbev-pill-green-text: #15803d;
    --tbev-score-good-text: #15803d;
    --tbev-score-mid-text: #a16207;
    --tbev-score-bad-text: #b91c1c;
    --tbev-scrollbar-thumb: rgba(0, 0, 0, 0.12);
    --tbev-scrollbar-thumb-hover: rgba(0, 0, 0, 0.2);
    --luci-accent-text: #4338ca;
}
html[data-tbe-theme="light"] .tbev-article details.luci-answer-key,
html[data-tbe-theme="light"] .tbev-article details.luci-answer-key--vault {
    background: var(--tbev-answer-key-vault-bg);
    border-color: var(--tbev-border-strong);
}
html[data-tbe-theme="light"] .tbev-article details.luci-answer-key summary,
html[data-tbe-theme="light"] .tbev-article details.luci-answer-key--vault summary {
    color: var(--tbev-accent-soft);
}
html[data-tbe-theme="light"] .tbev-article .luci-answer-key-panel,
html[data-tbe-theme="light"] .tbev-article .luci-answer-key-panel p,
html[data-tbe-theme="light"] .tbev-article .luci-answer-key-panel li,
html[data-tbe-theme="light"] .tbev-article .luci-answer-key-panel strong,
html[data-tbe-theme="light"] .tbev-article .luci-answer-key-panel em,
html[data-tbe-theme="light"] .tbev-article details.luci-answer-key:not(.luci-answer-key--vault)[open] > :not(summary) {
    color: var(--tbev-text);
}
html[data-tbe-theme="light"] .tbev-icon-btn {
    background: rgba(0, 0, 0, 0.03);
    color: var(--tbev-muted);
}
html[data-tbe-theme="light"] .tbev-icon-btn:hover {
    background: rgba(0, 0, 0, 0.06);
    color: var(--tbev-text);
}