/* ───────────────────────────────────────────────────────────────────
       STUDENT LESSON READER  (paginated — one section per page)
       Hash route #read/{tenant}/{course}/{lessonId}[/{n}|/done]

       Layout: app-style header + pip nav + single-section page + nav footer.
       Daily-use design — warm cream + deep ink + Fraunces display.
       Tokens: --bg, --bg-tint, --ink, --ink-soft, --ink-mute, --line,
       --line-soft, --accent-warm, --accent-blue, --gold, plus
       --read-wrong / --read-right for comparison blocks.
       ─────────────────────────────────────────────────────────────────── */
    :root {
      --read-wrong:    #C2563E;
      --read-wrong-bg: #FBEEE8;
      --read-right:    #2A6B47;
      --read-right-bg: #E9F2EC;
      --read-content-max: 720px;
      --read-header-h:    58px;
      --read-pip-size:    9px;
      --read-pip-cur:     13px;
    }
    .reader-shell {
      display: none;
      position: fixed; inset: 0;
      background: var(--bg);
      color: var(--ink);
      font-family: var(--font-body);
      flex-direction: column;
      z-index: 80;
    }
    .reader-shell.is-active { display: flex; }

    /* ── Top header (slim, app-style) ── */
    .reader-header {
      display: flex; align-items: center; gap: 1rem;
      padding: 0 1.4rem;
      height: var(--read-header-h);
      background: var(--bg-tint);
      border-bottom: 1px solid var(--line);
      flex-shrink: 0;
    }
    .reader-back {
      display: inline-flex; align-items: center; gap: .45rem;
      padding: .45rem .65rem;
      color: var(--ink-soft);
      text-decoration: none;
      border-radius: 8px;
      font-size: .88rem;
      font-weight: 500;
      transition: background .15s, color .15s;
    }
    .reader-back:hover { background: var(--line-soft); color: var(--ink); }
    .reader-header-title {
      flex: 1; min-width: 0;
      display: flex; align-items: baseline; gap: .8rem;
      overflow: hidden;
    }
    .reader-title {
      font-family: var(--font-display);
      font-size: 1.05rem;
      font-weight: 500;
      color: var(--ink);
      line-height: 1.25;
      white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    }
    .reader-header-meta {
      display: flex; align-items: center; gap: .45rem;
      flex-shrink: 0;
    }
    /* Edit-lesson button shown only to god + course editors on the
       reader header. Subtle pencil + label so it doesn't compete with
       the bookmark button or the lesson title. */
    .reader-edit-btn {
      display: inline-flex; align-items: center; gap: .35rem;
      padding: .35rem .7rem;
      border-radius: 999px;
      background: var(--card);
      border: 1px solid var(--line);
      color: var(--ink-soft);
      font-size: .8rem;
      font-weight: 600;
      text-decoration: none;
      cursor: pointer;
      transition: all .15s ease;
      flex-shrink: 0;
    }
    .reader-edit-btn:hover {
      color: var(--ink);
      border-color: var(--ink-mute);
      background: var(--bg-tint);
    }
    .reader-edit-btn[hidden] { display: none; }
    @media (max-width: 600px) {
      .reader-edit-btn span:not(.crown) { display: none; }
      .reader-edit-btn { padding: .35rem .5rem; }
    }

    .reader-bookmark-btn {
      width: 36px; height: 36px;
      padding: 0;
      background: transparent;
      border: 1px solid var(--line);
      border-radius: 999px;
      color: var(--ink-mute);
      cursor: pointer;
      display: inline-flex; align-items: center; justify-content: center;
      flex-shrink: 0;
      transition: color .15s, border-color .15s, background .15s, transform .15s;
    }
    .reader-bookmark-btn svg { width: 16px; height: 16px; }
    .reader-bookmark-btn:hover {
      color: var(--gold);
      border-color: var(--gold);
      background: rgba(184,146,58,.08);
    }
    .reader-bookmark-btn.is-saved {
      color: var(--gold);
      border-color: var(--gold);
      background: rgba(184,146,58,.12);
    }
    .reader-pill {
      padding: .22rem .55rem;
      border-radius: 999px;
      font-size: .68rem;
      font-weight: 600;
      letter-spacing: .04em;
      text-transform: uppercase;
      color: var(--ink-soft);
      background: var(--line-soft);
      border: 1px solid var(--line);
    }
    .reader-pill.is-grammar  { background: rgba(31,77,107,.10);  color: #1F4D6B;  border-color: rgba(31,77,107,.20); }
    .reader-pill.is-vocab    { background: rgba(92,138,106,.12); color: #3F6F4D;  border-color: rgba(92,138,106,.22); }
    .reader-pill.is-reading  { background: rgba(91,180,166,.12); color: #2D7368;  border-color: rgba(91,180,166,.22); }
    .reader-pill.is-writing  { background: rgba(214,118,89,.12); color: #A04A2E;  border-color: rgba(214,118,89,.22); }
    .reader-pill.is-speaking { background: rgba(232,155,110,.14); color: #94542B; border-color: rgba(232,155,110,.24); }
    .reader-pill.is-strategy { background: rgba(140,107,63,.10); color: #6E5125;  border-color: rgba(140,107,63,.22); }

    /* ── Pip nav row (under header) ── */
    .reader-pipbar {
      display: flex; align-items: center; justify-content: center;
      gap: 1.2rem;
      padding: .9rem 1.4rem;
      background: var(--bg);
      border-bottom: 1px solid var(--line-soft);
      flex-shrink: 0;
    }
    .reader-pips {
      display: flex; align-items: center;
      gap: 0;
    }
    .reader-pip {
      width: var(--read-pip-size); height: var(--read-pip-size);
      border-radius: 50%;
      border: 1.5px solid var(--ink-mute);
      background: var(--bg);
      cursor: pointer;
      padding: 0;
      transition: width .2s, height .2s, background .2s, border-color .2s, box-shadow .2s;
      flex-shrink: 0;
    }
    .reader-pip:hover { border-color: var(--gold); }
    .reader-pip.is-done {
      background: var(--gold);
      border-color: var(--gold);
    }
    .reader-pip.is-current {
      width: var(--read-pip-cur); height: var(--read-pip-cur);
      background: var(--gold);
      border-color: var(--gold);
      box-shadow: 0 0 0 4px rgba(184,146,58,.18);
    }
    .reader-pip-line {
      width: 18px; height: 2px;
      background: var(--line);
      transition: background .2s;
      flex-shrink: 0;
    }
    .reader-pip-line.is-done { background: var(--gold); }
    .reader-pipbar-counter {
      font-family: var(--font-display);
      font-size: .82rem;
      color: var(--ink-mute);
      font-weight: 500;
      letter-spacing: .04em;
      flex-shrink: 0;
      min-width: 4.5rem;
      text-align: right;
    }
    .reader-pipbar-counter strong {
      color: var(--ink);
      font-weight: 600;
    }

    /* ── Page area (one section at a time) ── */
    .reader-page {
      flex: 1; min-height: 0;
      overflow-y: auto;
      padding: 2.4rem 1.6rem 2rem;
      scroll-behavior: smooth;
    }
    .reader-page-inner {
      max-width: var(--read-content-max);
      margin: 0 auto;
      font-size: 1.02rem;
      line-height: 1.72;
      color: var(--ink);
    }
    .reader-page-eyebrow {
      display: inline-block;
      font-family: var(--font-display);
      font-size: .82rem;
      color: var(--gold);
      font-weight: 600;
      letter-spacing: .12em;
      margin-bottom: .55rem;
      text-transform: uppercase;
    }
    .reader-page-title {
      font-family: var(--font-display);
      font-size: 1.95rem;
      line-height: 1.2;
      letter-spacing: -.01em;
      font-weight: 500;
      color: var(--ink);
      margin: 0 0 1.8rem;
    }
    .reader-page-subline {
      display: block;
      font-size: .92rem;
      font-style: italic;
      color: var(--ink-soft);
      margin: -1rem 0 1.8rem;
    }

    /* ── Page enter animation ── */
    .reader-page-inner {
      animation: reader-page-enter .28s ease-out;
    }
    @keyframes reader-page-enter {
      from { opacity: 0; transform: translateY(10px); }
      to   { opacity: 1; transform: translateY(0); }
    }

    /* ── Footer nav (Prev / Next) ── */
    .reader-footer {
      display: flex; align-items: center; justify-content: space-between;
      gap: 1rem;
      padding: 1rem 1.6rem;
      background: var(--bg-tint);
      border-top: 1px solid var(--line);
      flex-shrink: 0;
    }
    .reader-nav-btn {
      display: inline-flex; align-items: center; gap: .55rem;
      padding: .65rem 1.25rem;
      font-size: .9rem;
      font-weight: 600;
      letter-spacing: .01em;
      border-radius: 999px;
      border: 1.5px solid var(--line);
      background: var(--card);
      color: var(--ink);
      cursor: pointer;
      font-family: var(--font-body);
      transition: border-color .15s, background .15s, transform .15s, opacity .15s;
    }
    .reader-nav-btn:hover { border-color: var(--ink-mute); }
    .reader-nav-btn:disabled,
    .reader-nav-btn.is-disabled {
      opacity: .3;
      cursor: not-allowed;
      pointer-events: none;
    }
    .reader-nav-btn.is-primary {
      background: var(--accent-warm);
      color: white;
      border-color: var(--accent-warm);
      padding: .7rem 1.6rem;
    }
    .reader-nav-btn.is-primary:hover {
      background: #BD5F45;
      border-color: #BD5F45;
      transform: translateY(-1px);
    }
    .reader-footer-spacer { flex: 1; }

    /* ── End-of-lesson page ── */
    .reader-end-page {
      display: flex; flex-direction: column;
      align-items: center; justify-content: center;
      text-align: center;
      gap: 1rem;
      min-height: 100%;
      padding: 1rem;
    }
    .reader-end-icon {
      width: 64px; height: 64px;
      border-radius: 50%;
      background: rgba(184,146,58,.15);
      color: var(--gold);
      font-size: 1.8rem; line-height: 1;
      display: flex; align-items: center; justify-content: center;
      margin-bottom: .8rem;
    }
    .reader-end-eyebrow {
      font-size: .72rem;
      letter-spacing: .14em;
      text-transform: uppercase;
      color: var(--gold);
      font-weight: 700;
    }
    .reader-end-title {
      font-family: var(--font-display);
      font-size: 2rem;
      font-weight: 500;
      color: var(--ink);
      line-height: 1.2;
      margin: 0;
    }
    .reader-end-desc {
      font-size: 1rem;
      color: var(--ink-soft);
      max-width: 460px;
      line-height: 1.55;
      margin: 0;
    }
    .reader-end-meta {
      display: flex; gap: 1.6rem;
      margin: .8rem 0 .4rem;
      font-size: .82rem;
      color: var(--ink-mute);
    }
    .reader-end-meta strong { color: var(--ink); font-weight: 600; }
    .reader-end-cta {
      margin-top: .6rem;
      padding: .85rem 1.8rem;
      background: var(--accent-warm);
      color: white;
      border: none;
      border-radius: 999px;
      font-size: .95rem;
      font-weight: 600;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
      transition: background .15s, transform .15s;
      font-family: var(--font-body);
    }
    .reader-end-cta:hover { background: #BD5F45; transform: translateY(-1px); }
    .reader-end-cta.is-disabled {
      background: var(--line);
      color: var(--ink-mute);
      cursor: default;
    }
    .reader-end-cta.is-disabled:hover { background: var(--line); transform: none; }
    .reader-end-secondary {
      font-size: .85rem;
      color: var(--ink-mute);
      text-decoration: none;
      margin-top: .2rem;
    }
    .reader-end-secondary:hover { color: var(--ink); text-decoration: underline; }

    /* ── Lesson quiz overlay ── */
    .reader-quiz-page {
      max-width: 760px;
      margin: 0 auto;
      padding: 2rem 1.5rem 4rem;
      animation: readerFadeIn .3s ease;
    }
    .reader-quiz-h {
      display: flex; align-items: center; justify-content: space-between;
      gap: 1rem; margin-bottom: 1.6rem;
    }
    .reader-quiz-exit {
      background: none; border: none; cursor: pointer;
      color: var(--ink-mute); font-size: .85rem; font-family: inherit;
      padding: .35rem .55rem; border-radius: 6px;
    }
    .reader-quiz-exit:hover { color: var(--ink); background: var(--line-soft); }
    .reader-quiz-progress { text-align: right; }
    .reader-quiz-counter {
      display: block; font-size: .72rem; letter-spacing: .12em;
      text-transform: uppercase; font-weight: 600; color: var(--ink-mute);
      margin-bottom: .4rem;
    }
    .reader-quiz-dots { display: inline-flex; gap: .35rem; }
    .reader-quiz-dot {
      width: 8px; height: 8px; border-radius: 50%;
      background: var(--line);
      transition: background .15s, transform .15s;
    }
    .reader-quiz-dot.is-current { background: var(--ink-soft); transform: scale(1.4); }
    .reader-quiz-dot.is-correct { background: #2A6B47; }
    .reader-quiz-dot.is-wrong   { background: #B6442C; }

    .reader-quiz-q {
      font-family: var(--font-display, Georgia, serif);
      font-size: 1.32rem; font-weight: 500; line-height: 1.45;
      color: var(--ink); margin-bottom: 1.6rem;
    }
    .reader-quiz-fill-prompt { font-family: var(--font-display, Georgia, serif); }
    .reader-quiz-fill-blank {
      display: inline-block; min-width: 4ch; border-bottom: 2px solid var(--ink-mute);
      letter-spacing: .12em; color: transparent;
    }

    /* MCQ */
    .reader-quiz-options {
      display: flex; flex-direction: column; gap: .55rem;
      margin-bottom: 1.2rem;
    }
    .reader-quiz-option {
      display: flex; align-items: center; gap: .9rem;
      padding: .85rem 1rem;
      background: var(--card, #fff); color: var(--ink);
      border: 1.5px solid var(--line); border-radius: 10px;
      font-family: inherit; font-size: .98rem; line-height: 1.4;
      cursor: pointer; text-align: left;
      transition: background .12s, border-color .12s, transform .08s;
    }
    .reader-quiz-option:hover:not(:disabled) {
      background: var(--bg-soft, var(--line-soft));
      border-color: var(--ink-mute);
    }
    .reader-quiz-option:active:not(:disabled) { transform: scale(0.99); }
    .reader-quiz-option:disabled { cursor: default; opacity: .85; }
    .reader-quiz-option-letter {
      flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%;
      display: inline-flex; align-items: center; justify-content: center;
      background: var(--line-soft); color: var(--ink-soft);
      font-family: var(--font-display, Georgia, serif); font-size: .9rem; font-weight: 600;
    }
    .reader-quiz-option-text { flex: 1; }
    .reader-quiz-option.is-correct {
      background: rgba(42, 107, 71, 0.08); border-color: #2A6B47;
    }
    .reader-quiz-option.is-correct .reader-quiz-option-letter {
      background: #2A6B47; color: #fff;
    }
    .reader-quiz-option.is-wrong {
      background: rgba(182, 68, 44, 0.06); border-color: #B6442C;
    }
    .reader-quiz-option.is-wrong .reader-quiz-option-letter {
      background: #B6442C; color: #fff;
    }

    /* True / False (and TFNG: True / False / Not Given) */
    .reader-quiz-tf-row {
      display: grid; grid-template-columns: 1fr 1fr; gap: .8rem;
      margin-bottom: 1.2rem;
    }
    .reader-quiz-tf-row.reader-quiz-tf-row-three { grid-template-columns: 1fr 1fr 1fr; }

    /* Multi-select */
    .reader-quiz-multi-list {
      display: flex; flex-direction: column; gap: .55rem;
      margin-bottom: 1.2rem;
    }
    .reader-quiz-multi-row {
      display: flex; align-items: center; gap: .9rem;
      padding: .85rem 1rem;
      background: var(--card, #fff); color: var(--ink);
      border: 1.5px solid var(--line); border-radius: 10px;
      font-size: .98rem; cursor: pointer;
      transition: background .12s, border-color .12s;
    }
    .reader-quiz-multi-row:hover { background: var(--bg-soft, var(--line-soft)); }
    .reader-quiz-multi-cb { width: 18px; height: 18px; flex-shrink: 0; cursor: pointer; }
    .reader-quiz-multi-row.is-correct { background: rgba(42,107,71,.08); border-color: #2A6B47; }
    .reader-quiz-multi-row.is-wrong   { background: rgba(182,68,44,.06); border-color: #B6442C; }
    .reader-quiz-tf-btn {
      padding: 1.1rem; font-size: 1.05rem; font-family: inherit;
      background: var(--card, #fff); color: var(--ink);
      border: 1.5px solid var(--line); border-radius: 10px;
      cursor: pointer; transition: background .12s, border-color .12s;
      font-weight: 500;
    }
    .reader-quiz-tf-btn:hover:not(:disabled) {
      background: var(--bg-soft, var(--line-soft));
      border-color: var(--ink-mute);
    }
    .reader-quiz-tf-btn:disabled { cursor: default; opacity: .85; }
    .reader-quiz-tf-btn.is-correct {
      background: rgba(42, 107, 71, 0.08); border-color: #2A6B47; color: #2A6B47;
    }
    .reader-quiz-tf-btn.is-wrong {
      background: rgba(182, 68, 44, 0.06); border-color: #B6442C; color: #B6442C;
    }

    /* Fill blank */
    .reader-quiz-fill-row {
      display: flex; gap: .55rem; margin-bottom: 1.2rem;
    }
    .reader-quiz-fill-input {
      flex: 1; padding: .8rem 1rem;
      background: var(--card, #fff); color: var(--ink);
      border: 1.5px solid var(--line); border-radius: 10px;
      font-family: inherit; font-size: 1rem;
    }
    .reader-quiz-fill-input:focus {
      outline: none; border-color: var(--ink-mute);
    }
    .reader-quiz-fill-input.is-correct { border-color: #2A6B47; background: rgba(42,107,71,.06); }
    .reader-quiz-fill-input.is-wrong   { border-color: #B6442C; background: rgba(182,68,44,.06); }
    .reader-quiz-fill-submit {
      padding: 0 1.4rem; font-size: .92rem; font-weight: 500;
      background: var(--ink); color: var(--bg, #fff);
      border: none; border-radius: 10px; cursor: pointer; font-family: inherit;
    }
    .reader-quiz-fill-submit:disabled { opacity: .6; cursor: default; }

    /* Match pairs */
    .reader-quiz-mp-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: .8rem;
      margin-bottom: 1rem;
    }
    .reader-quiz-mp-col { display: flex; flex-direction: column; gap: .45rem; }
    .reader-quiz-mp-left, .reader-quiz-mp-right {
      padding: .7rem .9rem; text-align: left;
      background: var(--card, #fff); color: var(--ink);
      border: 1.5px solid var(--line); border-radius: 8px;
      font-family: inherit; font-size: .92rem; line-height: 1.35;
      cursor: pointer; transition: all .12s;
    }
    .reader-quiz-mp-left:hover:not(:disabled),
    .reader-quiz-mp-right:hover:not(:disabled) {
      background: var(--bg-soft, var(--line-soft)); border-color: var(--ink-mute);
    }
    .reader-quiz-mp-left.is-selected {
      background: rgba(60, 90, 130, 0.08); border-color: #3C5A82;
    }
    .reader-quiz-mp-left.is-paired, .reader-quiz-mp-right.is-paired {
      opacity: .85; cursor: default;
    }
    .reader-quiz-mp-left.is-paired { background: var(--bg-soft, var(--line-soft)); }
    .reader-quiz-mp-left.is-paired[data-pair-color="1"] { border-left: 4px solid #C76A3F; }
    .reader-quiz-mp-right.is-paired[data-pair-color="1"] { border-left: 4px solid #C76A3F; }
    .reader-quiz-mp-left.is-paired[data-pair-color="2"] { border-left: 4px solid #3C5A82; }
    .reader-quiz-mp-right.is-paired[data-pair-color="2"] { border-left: 4px solid #3C5A82; }
    .reader-quiz-mp-left.is-paired[data-pair-color="3"] { border-left: 4px solid #5C8A6A; }
    .reader-quiz-mp-right.is-paired[data-pair-color="3"] { border-left: 4px solid #5C8A6A; }
    .reader-quiz-mp-left.is-paired[data-pair-color="4"] { border-left: 4px solid #8C6B3F; }
    .reader-quiz-mp-right.is-paired[data-pair-color="4"] { border-left: 4px solid #8C6B3F; }
    .reader-quiz-mp-left.is-paired[data-pair-color="5"] { border-left: 4px solid #6B4F8C; }
    .reader-quiz-mp-right.is-paired[data-pair-color="5"] { border-left: 4px solid #6B4F8C; }
    .reader-quiz-mp-left.is-wrong { background: rgba(182, 68, 44, 0.08); border-color: #B6442C; }

    /* Feedback + actions */
    .reader-quiz-feedback {
      display: none; padding: 1rem 1.2rem; border-radius: 10px;
      margin-top: .4rem; margin-bottom: 1.2rem;
      font-size: .92rem; line-height: 1.55;
    }
    .reader-quiz-feedback.is-visible { display: block; }
    .reader-quiz-feedback.is-correct {
      background: rgba(42, 107, 71, 0.08); color: #1f4f33;
      border: 1px solid rgba(42, 107, 71, 0.25);
    }
    .reader-quiz-feedback.is-wrong {
      background: rgba(182, 68, 44, 0.06); color: #883722;
      border: 1px solid rgba(182, 68, 44, 0.25);
    }
    .reader-quiz-fb-h {
      display: flex; align-items: center; gap: .55rem;
      font-weight: 600; margin-bottom: .4rem;
      font-family: var(--font-display, Georgia, serif);
    }
    .reader-quiz-fb-icon {
      display: inline-flex; align-items: center; justify-content: center;
      width: 22px; height: 22px; border-radius: 50%;
      font-size: .8rem; font-weight: 700;
    }
    .reader-quiz-feedback.is-correct .reader-quiz-fb-icon { background: #2A6B47; color: #fff; }
    .reader-quiz-feedback.is-wrong   .reader-quiz-fb-icon { background: #B6442C; color: #fff; }
    .reader-quiz-fb-explanation { color: inherit; opacity: .92; }
    .reader-quiz-fb-correct { display: block; margin-top: .4rem; font-size: .88rem; }

    .reader-quiz-actions { display: flex; justify-content: flex-end; gap: .55rem; }
    .reader-quiz-next, .reader-quiz-check {
      padding: .8rem 1.6rem; font-size: .95rem; font-weight: 500;
      background: var(--ink); color: var(--bg, #fff);
      border: none; border-radius: 10px; cursor: pointer; font-family: inherit;
    }
    .reader-quiz-next:hover:not(:disabled), .reader-quiz-check:hover:not(:disabled) {
      background: #000;
    }
    .reader-quiz-check:disabled { opacity: .55; cursor: default; }
    .reader-quiz-secondary {
      padding: .8rem 1.4rem; font-size: .92rem; font-weight: 500;
      background: none; color: var(--ink-soft);
      border: 1.5px solid var(--line); border-radius: 10px; cursor: pointer; font-family: inherit;
    }
    .reader-quiz-secondary:hover { background: var(--line-soft); color: var(--ink); }

    /* Summary */
    .reader-quiz-summary {
      max-width: 600px; margin: 2rem auto;
      text-align: center; padding: 2rem 1rem 4rem;
    }
    .reader-quiz-summary-icon {
      display: inline-flex; align-items: center; justify-content: center;
      width: 56px; height: 56px; border-radius: 50%;
      background: var(--ink); color: var(--bg, #fff);
      font-size: 1.6rem; margin-bottom: 1rem;
    }
    .reader-quiz-summary-eyebrow {
      font-size: .72rem; letter-spacing: .14em; text-transform: uppercase;
      font-weight: 600; color: var(--ink-mute); margin-bottom: .35rem;
    }
    .reader-quiz-summary-h {
      font-family: var(--font-display, Georgia, serif);
      font-size: 2.4rem; font-weight: 500; margin: 0 0 .4rem; color: var(--ink);
    }
    .reader-quiz-summary-praise { color: var(--ink-soft); margin-bottom: 1.6rem; }
    .reader-quiz-summary-wrongs {
      text-align: left; margin: 1.5rem auto;
      padding: 1rem 1.2rem; background: var(--bg-soft, var(--line-soft));
      border-radius: 10px;
    }
    .reader-quiz-summary-wrongs-h {
      font-size: .72rem; letter-spacing: .12em; text-transform: uppercase;
      font-weight: 700; color: var(--ink-mute); margin-bottom: .8rem;
    }
    .reader-quiz-summary-wrong { margin-bottom: 1rem; }
    .reader-quiz-summary-wrong:last-child { margin-bottom: 0; }
    .reader-quiz-summary-q { font-weight: 500; color: var(--ink); margin-bottom: .25rem; }
    .reader-quiz-summary-ex { font-size: .88rem; color: var(--ink-soft); }
    .reader-quiz-summary-actions {
      display: flex; gap: .55rem; justify-content: center; margin-top: 1rem;
    }

    @media (max-width: 540px) {
      .reader-quiz-tf-row { grid-template-columns: 1fr; }
      .reader-quiz-mp-grid { grid-template-columns: 1fr; }
      .reader-quiz-fill-row { flex-direction: column; }
      .reader-quiz-fill-submit { padding: .8rem; }
    }

    /* ── Block: text ── */
    .rb-text { margin: 0 0 1.4rem; }
    .rb-text p { margin: 0 0 1rem; }
    .rb-text p:last-child { margin-bottom: 0; }
    .rb-text strong { color: var(--ink); font-weight: 600; }
    .rb-text em { color: var(--ink); font-style: italic; }
    .rb-text ul, .rb-text ol { margin: 0 0 1rem; padding-left: 1.5rem; }
    .rb-text li { margin-bottom: .35rem; line-height: 1.65; }
    .rb-text blockquote {
      border-left: 3px solid var(--accent-warm);
      padding: .4rem 0 .4rem 1.2rem;
      margin: 1rem 0;
      color: var(--ink-soft);
      font-style: italic;
    }
    .rb-text code {
      font-family: 'SF Mono', Menlo, monospace;
      font-size: .9em;
      padding: .1em .4em;
      background: var(--line-soft);
      border-radius: 4px;
    }

    /* ── Block: comparison (✗ wrong / ✓ right) ── */
    .rb-comparison {
      margin: 1.6rem 0;
      display: flex; flex-direction: column;
      gap: .5rem;
      border-radius: var(--radius);
      overflow: hidden;
    }
    .rb-cmp-row {
      display: flex; align-items: flex-start; gap: .9rem;
      padding: .85rem 1.05rem;
      font-size: .98rem;
      line-height: 1.55;
    }
    .rb-cmp-row.is-wrong {
      background: var(--read-wrong-bg);
      border: 1px solid rgba(194,86,62,.20);
      color: var(--ink);
    }
    .rb-cmp-row.is-right {
      background: var(--read-right-bg);
      border: 1px solid rgba(42,107,71,.18);
      color: var(--ink);
    }
    .rb-cmp-icon {
      flex-shrink: 0;
      width: 1.3rem; height: 1.3rem;
      border-radius: 50%;
      display: inline-flex; align-items: center; justify-content: center;
      font-weight: 700;
      font-size: .85rem;
      color: white;
      line-height: 1;
      margin-top: .14rem;
    }
    .rb-cmp-row.is-wrong .rb-cmp-icon { background: var(--read-wrong); }
    .rb-cmp-row.is-right .rb-cmp-icon { background: var(--read-right); }
    .rb-cmp-text { flex: 1; min-width: 0; }
    .rb-cmp-text em { font-style: italic; color: var(--ink-soft); }

    /* ── Block: explanation (collapsible per language) ── */
    .rb-explanation-group {
      margin: 1.6rem 0;
      display: flex; flex-direction: column;
      gap: .55rem;
    }
    .rb-explanation {
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--bg-tint);
      overflow: hidden;
      transition: border-color .15s;
    }
    .rb-explanation.is-open { border-color: var(--gold); }
    .rb-exp-header {
      display: flex; align-items: center; gap: .7rem;
      width: 100%;
      padding: .82rem 1.1rem;
      background: rgba(184,146,58,.06);
      border: none;
      cursor: pointer;
      font-family: var(--font-body);
      text-align: left;
      color: var(--ink);
      font-size: .92rem;
      font-weight: 500;
      letter-spacing: .005em;
      transition: background .15s;
    }
    .rb-exp-header:hover { background: rgba(184,146,58,.12); }
    .rb-explanation.is-open .rb-exp-header { background: rgba(184,146,58,.12); }
    .rb-exp-label {
      flex: 1;
      display: inline-flex; align-items: center; gap: .35rem;
    }
    .rb-exp-chevron {
      font-size: .85rem;
      color: var(--ink-mute);
      transition: transform .2s ease;
      flex-shrink: 0;
    }
    .rb-explanation.is-open .rb-exp-chevron { transform: rotate(180deg); color: var(--gold); }
    .rb-exp-body {
      display: none;
      padding: 1rem 1.2rem 1.15rem;
      border-top: 1px solid var(--line-soft);
      font-size: .98rem;
      line-height: 1.72;
      color: var(--ink);
      background: var(--card);
    }
    .rb-explanation.is-open .rb-exp-body { display: block; }
    .rb-exp-body p { margin: 0 0 .85rem; }
    .rb-exp-body p:last-child { margin-bottom: 0; }
    .rb-exp-body strong { color: var(--ink); font-weight: 600; }
    .rb-exp-body em { color: var(--ink); font-style: italic; }
    .rb-exp-empty {
      padding: 1.2rem;
      text-align: center;
      font-size: .85rem;
      color: var(--ink-mute);
      font-style: italic;
    }

    /* ── Block: keyRule (pull-quote) ── */
    .rb-keyRule {
      margin: 1.8rem 0;
      padding: 1rem 1.4rem;
      border-left: 3px solid var(--gold);
      background: rgba(184,146,58,.05);
      border-radius: 0 var(--radius) var(--radius) 0;
      font-family: var(--font-display);
      font-size: 1.08rem;
      line-height: 1.55;
      color: var(--ink);
      font-weight: 500;
    }
    .rb-keyRule strong { font-weight: 600; }
    .rb-keyRule em { font-style: italic; color: var(--ink-soft); }

    /* ── Block: reveal (collapsible Q→A) ── */
    .rb-reveal {
      margin: 1.4rem 0;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--card);
      overflow: hidden;
    }
    .rb-reveal-q {
      display: flex; align-items: flex-start; gap: .8rem;
      padding: 1rem 1.2rem;
      font-size: .97rem;
      color: var(--ink);
      line-height: 1.55;
    }
    .rb-reveal-q-mark {
      flex-shrink: 0;
      font-family: var(--font-display);
      font-size: 1.05rem;
      color: var(--gold);
      font-weight: 600;
      line-height: 1;
      margin-top: .08rem;
    }
    .rb-reveal-q-text { flex: 1; min-width: 0; font-weight: 500; }
    .rb-reveal-actions {
      padding: 0 1.2rem .9rem;
      display: flex; gap: .5rem; flex-wrap: wrap;
    }
    .rb-reveal-btn {
      padding: .42rem .9rem;
      font-size: .82rem;
      font-weight: 600;
      letter-spacing: .02em;
      color: var(--ink);
      background: var(--line-soft);
      border: 1px solid var(--line);
      border-radius: 8px;
      cursor: pointer;
      transition: background .15s, color .15s, border-color .15s;
      font-family: var(--font-body);
    }
    .rb-reveal-btn:hover { background: var(--accent-warm-soft); border-color: var(--accent-warm); }
    .rb-reveal-btn.is-hint { background: transparent; }
    .rb-reveal-answer {
      padding: 1rem 1.2rem;
      border-top: 1px solid var(--line-soft);
      background: var(--read-right-bg);
      font-size: .96rem;
      line-height: 1.6;
      color: var(--ink);
      display: none;
    }
    .rb-reveal-answer.is-shown { display: block; }
    .rb-reveal-answer-mark {
      display: inline-flex; align-items: center; justify-content: center;
      width: 1.2rem; height: 1.2rem;
      background: var(--read-right); color: white;
      border-radius: 50%; font-size: .75rem; font-weight: 700;
      margin-right: .5rem; vertical-align: -2px;
    }
    .rb-reveal-hint {
      padding: .8rem 1.2rem;
      border-top: 1px dashed var(--line);
      background: var(--bg-tint);
      font-size: .88rem;
      line-height: 1.55;
      color: var(--ink-soft);
      font-style: italic;
      display: none;
    }
    .rb-reveal-hint.is-shown { display: block; }
    .rb-reveal-hint::before {
      content: "Hint  ";
      display: inline-block;
      font-size: .68rem;
      letter-spacing: .12em;
      text-transform: uppercase;
      font-weight: 700;
      font-style: normal;
      color: var(--gold);
      margin-right: .4rem;
    }

    /* ── Block: table ── */
    .rb-table-wrap {
      margin: 1.8rem 0;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      overflow: hidden;
      background: var(--card);
    }
    .rb-table { width: 100%; border-collapse: collapse; font-size: .94rem; }
    .rb-table thead th {
      text-align: left;
      padding: .75rem 1rem;
      background: rgba(184,146,58,.08);
      border-bottom: 1px solid var(--line);
      font-size: .75rem;
      letter-spacing: .08em;
      text-transform: uppercase;
      font-weight: 700;
      color: var(--ink);
    }
    .rb-table tbody td {
      padding: .7rem 1rem;
      border-bottom: 1px solid var(--line-soft);
      vertical-align: top;
      line-height: 1.5;
      color: var(--ink);
    }
    .rb-table tbody tr:nth-child(even) { background: var(--bg-tint); }
    .rb-table tbody tr:last-child td { border-bottom: none; }
    .rb-table-caption {
      margin-top: .55rem;
      font-size: .82rem;
      color: var(--ink-mute);
      text-align: center;
      font-style: italic;
    }

    /* ── Block: image / video / animation ── */
    .rb-media { margin: 1.8rem 0; text-align: center; }
    .rb-media img,
    .rb-media iframe,
    .rb-media video,
    .rb-media lottie-player {
      max-width: 100%;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      display: block;
      margin: 0 auto;
    }
    .rb-media iframe { aspect-ratio: 16/9; width: 100%; border: 0; }
    .rb-media-caption {
      margin-top: .55rem;
      font-size: .82rem;
      color: var(--ink-mute);
      font-style: italic;
    }
    .rb-media-placeholder {
      padding: 2.4rem 1.2rem;
      background: var(--bg-tint);
      border: 1px dashed var(--line);
      border-radius: var(--radius);
      color: var(--ink-mute);
      text-align: center;
      font-size: .88rem;
    }

    /* ── Block: graph ── */
    .rb-graph { margin: 1.8rem 0; }
    .rb-graph canvas {
      max-width: 100%;
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 1rem;
    }
    .rb-graph-caption {
      margin-top: .55rem;
      font-size: .82rem;
      color: var(--ink-mute);
      text-align: center;
      font-style: italic;
    }

    /* ───────────────────────────────────────────────────────────────────
       COURSE LESSONS LIST  (the "all lessons" page)
       Hash route #lessons/{tenant}/{course}
       Layout: app header + course hero + filter row + responsive card grid
       ─────────────────────────────────────────────────────────────────── */
    .course-shell {
      display: none;
      position: fixed; inset: 0;
      background: var(--bg);
      color: var(--ink);
      font-family: var(--font-body);
      flex-direction: column;
      z-index: 75;
      overflow: hidden;
    }
    .course-shell.is-active { display: flex; }

    /* Cosmetic top header — hidden. Page identity comes from the left
       rail + the page's own h1. The reader-header (lesson view) stays. */
    .course-header {
      display: none;
    }
    .course-back {
      display: inline-flex; align-items: center; gap: .45rem;
      padding: .45rem .65rem;
      color: var(--ink-soft);
      text-decoration: none;
      border-radius: 8px;
      font-size: .88rem;
      font-weight: 500;
      transition: background .15s, color .15s;
    }
    .course-back:hover { background: var(--line-soft); color: var(--ink); }
    /* Hide the back arrow when the sidebar is visible — users navigate via
       the sidebar instead. On mobile the sidebar collapses, so we restore
       the back link via the media query below. */
    body.has-sidebar .course-back { display: none; }
    @media (max-width: 880px) {
      body.has-sidebar .course-back { display: inline-flex; }
    }
    .course-header-title {
      flex: 1; min-width: 0;
      font-family: var(--font-display);
      font-size: 1.05rem;
      font-weight: 500;
      color: var(--ink);
      white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
      display: flex; align-items: center; gap: .65rem;
    }
    .course-header-logo {
      height: 26px; width: auto; max-width: 80px;
      object-fit: contain;
      flex-shrink: 0;
    }
    .course-user-pill {
      display: inline-flex; align-items: center; gap: .45rem;
      padding: .35rem .7rem;
      font-size: .82rem;
      color: var(--ink-soft);
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 999px;
      font-weight: 500;
    }
    .course-user-pill .crown { font-size: .9rem; color: var(--gold); }

    .course-body {
      flex: 1; min-height: 0;
      overflow-y: auto;
      padding: 2.4rem 2rem 4rem;
    }
    .course-inner {
      max-width: 1180px;
      margin: 0 auto;
    }

    /* ── Course hero ── */
    .course-hero {
      margin-bottom: 2rem;
      padding-bottom: 1.6rem;
      border-bottom: 1px solid var(--line);
    }
    .course-hero-eyebrow {
      display: inline-block;
      font-size: .72rem;
      letter-spacing: .14em;
      text-transform: uppercase;
      color: var(--gold);
      font-weight: 700;
      margin-bottom: .55rem;
    }
    .course-hero-title {
      font-family: var(--font-display);
      font-size: 2.2rem;
      line-height: 1.15;
      letter-spacing: -.01em;
      font-weight: 500;
      color: var(--ink);
      margin: 0 0 .6rem;
    }
    .course-hero-desc {
      font-size: .98rem;
      color: var(--ink-soft);
      max-width: 56ch;
      line-height: 1.55;
      margin: 0;
    }

    /* ── Filter row ── */
    .course-filters {
      display: flex; flex-direction: column; gap: .85rem;
      margin-bottom: 2rem;
    }
    .course-chips {
      display: flex; flex-wrap: wrap;
      gap: .45rem;
    }
    .course-chips-label {
      font-size: .68rem;
      letter-spacing: .14em;
      text-transform: uppercase;
      color: var(--ink-mute);
      font-weight: 700;
      align-self: center;
      margin-right: .4rem;
      min-width: 4.4rem;
    }
    .course-chip {
      display: inline-flex; align-items: center; gap: .4rem;
      padding: .42rem .85rem;
      font-size: .82rem;
      font-weight: 500;
      color: var(--ink-soft);
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 999px;
      cursor: pointer;
      transition: background .15s, border-color .15s, color .15s;
      font-family: var(--font-body);
    }
    .course-chip:hover { border-color: var(--ink-mute); color: var(--ink); }
    .course-chip.is-active {
      background: var(--ink);
      color: var(--bg);
      border-color: var(--ink);
    }
    .course-chip-count {
      font-size: .72rem;
      color: var(--ink-mute);
      font-weight: 600;
    }
    .course-chip.is-active .course-chip-count { color: inherit; opacity: .65; }
    .course-chip.is-cat-grammar.is-active  { background: #1F4D6B; border-color: #1F4D6B; color: white; }
    .course-chip.is-cat-vocab.is-active    { background: #3F6F4D; border-color: #3F6F4D; color: white; }
    .course-chip.is-cat-reading.is-active  { background: #2D7368; border-color: #2D7368; color: white; }
    .course-chip.is-cat-writing.is-active  { background: #A04A2E; border-color: #A04A2E; color: white; }
    .course-chip.is-cat-speaking.is-active { background: #94542B; border-color: #94542B; color: white; }
    .course-chip.is-cat-strategy.is-active { background: #6E5125; border-color: #6E5125; color: white; }
    .course-chip.is-cat-grammar.is-active .course-chip-count,
    .course-chip.is-cat-vocab.is-active .course-chip-count,
    .course-chip.is-cat-reading.is-active .course-chip-count,
    .course-chip.is-cat-writing.is-active .course-chip-count,
    .course-chip.is-cat-speaking.is-active .course-chip-count,
    .course-chip.is-cat-strategy.is-active .course-chip-count { color: inherit; opacity: .8; }

    .course-search-row {
      display: flex; align-items: center; gap: .65rem;
      flex-wrap: wrap;
    }
    .course-search-wrap {
      position: relative;
      flex: 1;
      max-width: 420px;
      min-width: 240px;
    }
    .course-search-wrap::before {
      content: '🔍';
      position: absolute;
      left: .85rem;
      top: 50%;
      transform: translateY(-50%);
      font-size: .9rem;
      opacity: .55;
      pointer-events: none;
    }
    .course-search {
      width: 100%;
      padding: .65rem 1rem .65rem 2.4rem;
      font-size: .9rem;
      font-family: var(--font-body);
      color: var(--ink);
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 999px;
      outline: none;
      transition: border-color .15s, box-shadow .15s;
    }
    .course-search:focus {
      border-color: var(--gold);
      box-shadow: 0 0 0 4px rgba(184,146,58,.12);
    }
    .course-search::placeholder { color: var(--ink-mute); }

    /* ── Card grid ── */
    .course-grid-meta {
      font-size: .82rem;
      color: var(--ink-mute);
      margin-bottom: 1rem;
    }
    .course-grid-meta strong { color: var(--ink); font-weight: 600; }
    .course-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 1rem;
    }

    /* ── Lesson card ── */
    .course-card {
      position: relative;
      display: flex; flex-direction: column;
      padding: 1.1rem 1.2rem 1.05rem;
      padding-left: 1.5rem;
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      cursor: pointer;
      text-decoration: none;
      color: var(--ink);
      transition: transform .18s, box-shadow .18s, border-color .18s;
      min-height: 132px;
      overflow: hidden;
    }
    .course-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
      border-color: var(--ink-mute);
    }
    .course-card::before {
      content: '';
      position: absolute;
      left: 0; top: 0; bottom: 0;
      width: 4px;
      background: var(--ink-mute);
      transition: background .18s;
    }
    .course-card.is-cat-grammar::before  { background: #3B6A8A; }
    .course-card.is-cat-vocab::before    { background: #5C8A6A; }
    .course-card.is-cat-reading::before  { background: #5bb4a6; }
    .course-card.is-cat-writing::before  { background: #D67659; }
    .course-card.is-cat-speaking::before { background: #e89b6e; }
    .course-card.is-cat-strategy::before { background: #8C6B3F; }
    .course-card-eyebrow {
      display: inline-block;
      font-size: .68rem;
      letter-spacing: .14em;
      text-transform: uppercase;
      color: var(--ink-mute);
      font-weight: 700;
      margin-bottom: .55rem;
    }
    .course-card.is-cat-grammar  .course-card-eyebrow { color: #3B6A8A; }
    .course-card.is-cat-vocab    .course-card-eyebrow { color: #3F6F4D; }
    .course-card.is-cat-reading  .course-card-eyebrow { color: #2D7368; }
    .course-card.is-cat-writing  .course-card-eyebrow { color: #A04A2E; }
    .course-card.is-cat-speaking .course-card-eyebrow { color: #94542B; }
    .course-card.is-cat-strategy .course-card-eyebrow { color: #6E5125; }

    /* Completed lessons — green tint + thick green left stripe + corner
       Completed badge. Loud enough to scan the grid at a glance. */
    .course-card.is-completed {
      background: linear-gradient(180deg, #DCEEDF 0%, #E9F2EC 60%, #EDF6EF 100%);
      border-color: rgba(42,107,71,.5);
      box-shadow: 0 0 0 1px rgba(42,107,71,.18) inset;
    }
    .course-card.is-completed::before {
      background: var(--read-right);
      width: 6px;
    }
    .course-card.is-completed .course-card-eyebrow {
      color: var(--read-right) !important;
    }
    .course-card.is-completed .course-card-eyebrow::before {
      content: '✓ ';
      color: var(--read-right);
      font-weight: 800;
    }
    .course-card.is-completed:hover {
      border-color: var(--read-right);
      box-shadow: 0 0 0 1px var(--read-right) inset, var(--shadow-md);
    }
    .course-card-done-badge {
      position: absolute;
      top: 12px; right: 48px;          /* sit left of bookmark button */
      display: inline-flex; align-items: center; gap: .25rem;
      padding: .22rem .55rem;
      border-radius: 999px;
      background: var(--read-right);
      color: #fff;
      font-size: .66rem;
      font-weight: 700;
      letter-spacing: .08em;
      text-transform: uppercase;
      line-height: 1;
      box-shadow: 0 1px 4px rgba(42,107,71,.35);
    }
    .course-card-done-badge svg { width: 11px; height: 11px; }
    .course-card-title {
      font-family: var(--font-display);
      font-size: 1.08rem;
      font-weight: 500;
      line-height: 1.3;
      color: var(--ink);
      margin: 0 0 .8rem;
      letter-spacing: -.005em;
      /* clamp 2 lines */
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }
    .course-card-meta {
      display: flex; align-items: center; gap: .8rem;
      margin-top: auto;
      font-size: .78rem;
      color: var(--ink-mute);
    }
    .course-card-meta span {
      display: inline-flex; align-items: center; gap: .25rem;
    }
    .course-card-meta .sep {
      width: 3px; height: 3px;
      background: var(--ink-mute);
      border-radius: 50%;
      opacity: .5;
    }

    .course-empty {
      grid-column: 1 / -1;
      padding: 3rem 1rem;
      text-align: center;
      color: var(--ink-mute);
      font-style: italic;
      border: 1px dashed var(--line);
      border-radius: var(--radius);
      background: var(--bg-tint);
    }

    /* Bookmark — per-card icon button */
    .course-card-bookmark {
      position: absolute;
      top: .55rem;
      right: .55rem;
      width: 30px; height: 30px;
      padding: 0;
      background: rgba(255,255,255,.85);
      border: 1px solid var(--line);
      border-radius: 999px;
      color: var(--ink-mute);
      cursor: pointer;
      display: inline-flex; align-items: center; justify-content: center;
      transition: color .15s, background .15s, border-color .15s, transform .15s;
      font-family: var(--font-body);
      z-index: 2;
    }
    .course-card-bookmark svg { width: 14px; height: 14px; }
    .course-card-bookmark:hover {
      color: var(--gold);
      border-color: var(--gold);
      background: var(--card);
      transform: scale(1.06);
    }
    .course-card-bookmark.is-saved {
      color: var(--gold);
      border-color: var(--gold);
      background: rgba(184,146,58,.10);
    }

    /* Bookmark — filter chip on the lessons-list page */
    .course-bookmark-toggle {
      display: inline-flex; align-items: center; gap: .4rem;
      flex-shrink: 0;
    }
    .course-bookmark-toggle svg { width: 14px; height: 14px; }
    .course-bookmark-toggle.is-active {
      background: var(--gold);
      border-color: var(--gold);
      color: white;
    }
    .course-bookmark-toggle.is-active .course-chip-count { color: rgba(255,255,255,.75); }

    /* Loading state for course list */
    .course-loading {
      display: flex; flex-direction: column;
      align-items: center; justify-content: center;
      padding: 4rem 2rem;
      color: var(--ink-mute);
    }

    /* Mobile */
    @media (max-width: 640px) {
      .course-header { padding: 0 .9rem; }
      .course-back-label { display: none; }
      .course-body { padding: 1.6rem 1rem 3rem; }
      .course-hero-title { font-size: 1.7rem; }
      .course-chips-label { display: none; }
      .course-chip { font-size: .78rem; padding: .38rem .7rem; }
      .course-grid { grid-template-columns: 1fr; }
    }

    /* ── Loading + error states ── */
    .reader-loading, .reader-error {
      display: flex; flex-direction: column;
      align-items: center; justify-content: center;
      flex: 1;
      padding: 2rem;
      color: var(--ink-mute);
      text-align: center;
    }
    .reader-loading .reader-spinner {
      width: 32px; height: 32px;
      border: 3px solid var(--line);
      border-top-color: var(--gold);
      border-radius: 50%;
      animation: reader-spin .9s linear infinite;
      margin-bottom: .8rem;
    }
    @keyframes reader-spin { to { transform: rotate(360deg); } }
    .reader-error h2 {
      font-family: var(--font-display);
      color: var(--ink);
      font-size: 1.4rem;
      margin: 0 0 .6rem;
      font-weight: 500;
    }
    .reader-error a {
      color: var(--accent-warm);
      text-decoration: none;
      margin-top: 1.2rem;
      font-weight: 600;
    }
    .reader-error a:hover { text-decoration: underline; }

    /* ── Mobile (<= 640px) ── */
    @media (max-width: 640px) {
      .reader-header { padding: 0 .9rem; gap: .7rem; }
      .reader-back-label { display: none; }
      .reader-title { font-size: .95rem; }
      .reader-pill { font-size: .62rem; padding: .18rem .45rem; }
      .reader-pipbar { padding: .65rem .8rem; gap: .8rem; }
      .reader-pip-line { width: 12px; }
      .reader-pipbar-counter { font-size: .76rem; min-width: auto; }
      .reader-page { padding: 1.6rem 1rem 1.2rem; }
      .reader-page-title { font-size: 1.55rem; margin-bottom: 1.4rem; }
      .reader-footer { padding: .75rem .9rem; gap: .6rem; }
      .reader-nav-btn { padding: .55rem 1rem; font-size: .85rem; }
      .reader-nav-btn.is-primary { padding: .55rem 1.15rem; }
    }
    @media (max-width: 380px) {
      .reader-pip-line { width: 8px; }
      .reader-pipbar { gap: .55rem; }
    }