/* Reading-mode styles. Two concerns:
   (1) .rp-markdown — readable typography for rendered lesson markdown. Used BOTH on the in-cabinet
       content page (/content) and inside the reader. Before this file the class had no rules at all,
       so lesson text fell back to UA defaults (no paragraph rhythm, cramped lists).
   (2) .rp-reader — the chrome-free reader shell: full-viewport background per color scheme, a
       centered reading column, a slim top bar, and a native <details> settings popover. Color and
       base font-size are driven by CSS variables keyed off the data-reader-scheme / data-reader-size
       attributes that ReaderPage sets (and reader.js persists). */

/* ---- (1) Shared markdown typography ---- */
.rp-markdown { line-height: 1.65; }
.rp-markdown > :first-child { margin-top: 0; }
.rp-markdown > :last-child { margin-bottom: 0; }
.rp-markdown p { margin: 0 0 1em; }
.rp-markdown h1, .rp-markdown h2, .rp-markdown h3, .rp-markdown h4 {
    line-height: 1.25; margin: 1.6em 0 0.6em; font-weight: 650;
}
.rp-markdown ul, .rp-markdown ol { margin: 0 0 1em; padding-left: 1.5em; }
.rp-markdown li { margin: 0.25em 0; }
.rp-markdown blockquote {
    margin: 0 0 1em; padding: 0.25em 0 0.25em 1em;
    border-left: 3px solid var(--slate-300, #cbd5e1); color: var(--slate-500, #64748b);
}
.rp-markdown code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.9em;
    background: var(--slate-100, #f1f5f9); padding: 0.1em 0.35em; border-radius: 4px;
}
.rp-markdown pre { overflow-x: auto; background: var(--slate-100, #f1f5f9); padding: 0.8em 1em; border-radius: 8px; }
.rp-markdown pre code { background: none; padding: 0; }
.rp-markdown img { max-width: 100%; height: auto; border-radius: 8px; }
.rp-markdown a { color: var(--brand-primary, #1d73b3); }

/* ---- (2) Reader shell ---- */
.rp-reader {
    --reader-bg: #ffffff; --reader-fg: #1a1a1a; --reader-muted: #6b6b6b;
    --reader-card: rgba(0, 0, 0, 0.04); --reader-accent: #1d73b3; --reader-font: 18px;
    position: fixed; inset: 0; overflow-y: auto; z-index: 1;
    background: var(--reader-bg); color: var(--reader-fg);
    font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.rp-reader[data-reader-scheme="sepia"] {
    --reader-bg: #f4ecd8; --reader-fg: #5b4636; --reader-muted: #8a7a64;
    --reader-card: rgba(91, 70, 54, 0.07); --reader-accent: #9a6a3a;
}
.rp-reader[data-reader-scheme="dark"] {
    --reader-bg: #1a1a1a; --reader-fg: #d6d6d6; --reader-muted: #9a9a9a;
    --reader-card: rgba(255, 255, 255, 0.06); --reader-accent: #4ea3e0;
}
.rp-reader[data-reader-size="0"] { --reader-font: 16px; }
.rp-reader[data-reader-size="1"] { --reader-font: 18px; }
.rp-reader[data-reader-size="2"] { --reader-font: 20px; }
.rp-reader[data-reader-size="3"] { --reader-font: 23px; }
.rp-reader[data-reader-size="4"] { --reader-font: 26px; }

.rp-reader .rp-markdown,
.rp-reader .rp-markdown :is(p, li, blockquote) { color: var(--reader-fg); }
.rp-reader .rp-markdown code,
.rp-reader .rp-markdown pre { background: var(--reader-card); }
.rp-reader .rp-markdown a { color: var(--reader-accent); }

.rp-reader-bar {
    position: sticky; top: 0; display: flex; align-items: center; justify-content: space-between;
    padding: 10px 16px; background: var(--reader-bg);
    border-bottom: 1px solid var(--reader-card); backdrop-filter: blur(4px);
}
.rp-reader-exit { color: var(--reader-fg); text-decoration: none; font-size: 0.95rem; }
.rp-reader-settings { position: relative; }
.rp-reader-aa {
    list-style: none; cursor: pointer; font-weight: 650; padding: 4px 10px;
    border: 1px solid var(--reader-card); border-radius: 8px; user-select: none;
}
/* `list-style: none` hides the disclosure triangle in Firefox; WebKit/Blink need this too. */
.rp-reader-aa::-webkit-details-marker { display: none; }

.rp-reader-progress {
    position: sticky; top: 0; left: 0; height: 3px; z-index: 3;
    background: var(--reader-accent);
    transform: scaleX(var(--reader-progress, 0)); transform-origin: left center;
    transition: transform 0.08s linear;
}

.rp-reader-settings[open] .rp-reader-panel { display: flex; }
.rp-reader-panel {
    display: none; position: absolute; right: 0; top: calc(100% + 8px); z-index: 2;
    flex-direction: column; gap: 12px; padding: 14px; min-width: 200px;
    background: var(--reader-bg); color: var(--reader-fg);
    border: 1px solid var(--reader-card); border-radius: 12px;
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.18);
}
.rp-reader-fonts, .rp-reader-schemes { display: flex; gap: 8px; }
.rp-reader-font {
    flex: 1; cursor: pointer; padding: 8px 0; font-size: 1rem;
    background: var(--reader-card); color: var(--reader-fg); border: 0; border-radius: 8px;
}
.rp-reader-swatch {
    width: 32px; height: 32px; border-radius: 50%; cursor: pointer;
    border: 2px solid var(--reader-card);
}
.rp-reader-swatch.rp-scheme-light { background: #ffffff; border-color: #d0d0d0; }
.rp-reader-swatch.rp-scheme-sepia { background: #f4ecd8; }
.rp-reader-swatch.rp-scheme-dark { background: #1a1a1a; }
.rp-reader-fullscreen {
    cursor: pointer; padding: 8px 0; background: var(--reader-card); color: var(--reader-fg);
    border: 0; border-radius: 8px; font-size: 0.95rem;
}

.rp-reader-font:disabled { opacity: 0.4; cursor: default; }
.rp-reader-swatch.is-active { outline: 2px solid var(--reader-accent); outline-offset: 2px; }
.rp-reader-opt {
    flex: 1; cursor: pointer; padding: 8px 6px; font-size: 0.9rem;
    background: var(--reader-card); color: var(--reader-fg); border: 0; border-radius: 8px;
}
.rp-reader-opt.is-active { outline: 2px solid var(--reader-accent); outline-offset: 1px; font-weight: 650; }
.rp-reader-opts { display: flex; gap: 8px; }

.rp-reader-doc {
    max-width: var(--reader-measure, 34em);
    margin: 0 auto; padding: 32px 20px 96px;
    font-size: var(--reader-font);
    font-family: var(--reader-doc-font, inherit);
}
.rp-reader[data-reader-width="narrow"] { --reader-measure: 30em; }
.rp-reader[data-reader-width="medium"] { --reader-measure: 34em; }
.rp-reader[data-reader-width="wide"]   { --reader-measure: 40em; }
.rp-reader[data-reader-font-family="serif"] { --reader-doc-font: Georgia, "Noto Serif", "Times New Roman", serif; }
.rp-reader-title { font-size: 1.6em; line-height: 1.2; margin: 0 0 1em; font-weight: 700; }
.rp-reader-block { margin: 0 0 1.8em; }
.rp-reader-video { position: relative; width: 100%; padding-top: 56.25%; }
.rp-reader-video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; border-radius: 8px; }
.rp-reader-file {
    display: flex; align-items: center; gap: 12px; text-decoration: none;
    padding: 14px 16px; background: var(--reader-card); border-radius: 10px; color: var(--reader-fg);
}
.rp-reader-file-name { font-weight: 600; }
.rp-reader-file-size { color: var(--reader-muted); font-size: 0.85em; }
.rp-reader-file-cta { margin-left: auto; color: var(--reader-accent); font-weight: 600; }
.rp-reader-hw { padding: 16px; background: var(--reader-card); border-radius: 12px; }
.rp-reader-hw-label { font-weight: 650; margin-bottom: 8px; }
.rp-reader-hw-cta {
    display: inline-block; margin-top: 12px; padding: 8px 16px; border-radius: 8px;
    background: var(--reader-accent); color: #fff; text-decoration: none; font-weight: 600;
}

.rp-reader-nav {
    max-width: var(--reader-measure, 34em); margin: 2.4em auto 0;
    display: flex; gap: 12px; justify-content: space-between;
    border-top: 1px solid var(--reader-card); padding-top: 1.4em;
}
.rp-reader-nav-link {
    flex: 1; display: flex; flex-direction: column; gap: 2px; text-decoration: none;
    padding: 12px 14px; border-radius: 10px; background: var(--reader-card); color: var(--reader-fg);
}
.rp-reader-nav-link.next { text-align: right; }
.rp-reader-nav-link.is-disabled { opacity: 0.5; pointer-events: none; }
.rp-reader-nav-dir { font-size: 0.8em; color: var(--reader-muted); }
.rp-reader-nav-title { font-weight: 600; }

/* ---- Audio narration player bar ---- */
.rp-reader-player {
    position: sticky; bottom: 0; display: flex; gap: .5rem; align-items: center;
    justify-content: center; padding: .5rem 1rem;
    background: var(--reader-card); border-top: 1px solid var(--reader-muted);
    backdrop-filter: blur(4px); z-index: 2;
}
.rp-reader-player-btn {
    font-size: 1.1rem; background: none; border: none; color: var(--reader-fg);
    cursor: pointer; padding: .25rem .5rem; line-height: 1;
    border-radius: 6px; transition: background 0.15s;
}
.rp-reader-player-btn:hover { background: var(--reader-card); }
.rp-reader-player-rate {
    background: var(--reader-bg); color: var(--reader-fg);
    border: 1px solid var(--reader-muted); border-radius: 6px;
    padding: .2rem .4rem; font-size: 0.9rem;
}
/* Highlight the block currently being narrated */
.rp-reader-block.is-speaking {
    background: color-mix(in srgb, var(--reader-accent) 12%, transparent);
    border-radius: 8px;
    transition: background 0.25s;
}