:root {
  --bg: #fbfaf7; --fg: #1d1c1a; --muted: #6b6760; --line: #e3dfd6; --card: #ffffff;
  --accent: #0b6e8f; --accent-soft: #e2f1f6; --gloss: #b8862b; --ru: #4b5a3a;
  --a1: #2e7d32; --a2: #1976d2; --b1: #6a1b9a; --b2: #c62828; --c1: #37474f;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #17181a; --fg: #ebe8e1; --muted: #9a958c; --line: #2c2e32; --card: #1f2124;
          --accent: #5cb3d1; --accent-soft: #163541; --gloss: #d9a949; --ru: #a9bd92; }
}
* { box-sizing: border-box; }
html { font-size: 17px; }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; line-height: 1.55; }
a { color: var(--accent); }
main { max-width: 46rem; margin: 0 auto; padding: 1.5rem 1rem 4rem; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: .6rem 0 .6rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 .7rem; }
h2 small { color: var(--muted); font-weight: normal; font-size: .85rem; }
.lead, .summary { color: var(--muted); }
.muted { color: var(--muted); }
.top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .7rem 1rem; border-bottom: 1px solid var(--line); background: var(--card); position: sticky; top: 0; z-index: 5; }
.brand { font-weight: 700; text-decoration: none; color: var(--fg); letter-spacing: .02em; }
.top nav a { margin-left: 1rem; text-decoration: none; }
.count { background: var(--accent); color: #fff; border-radius: 1em; padding: 0 .5em; font-size: .75rem; vertical-align: middle; }
.foot { max-width: 46rem; margin: 0 auto; padding: 1rem; color: var(--muted); font-size: .85rem; border-top: 1px solid var(--line); }
.chip { display: inline-block; font-size: .75rem; font-weight: 700; padding: .1em .55em; border-radius: .4em; color: #fff; background: var(--muted); vertical-align: middle; }
.lvl-a1 { background: var(--a1); } .lvl-a2 { background: var(--a2); } .lvl-b1 { background: var(--b1); } .lvl-b2 { background: var(--b2); } .lvl-c1 { background: var(--c1); }
.meta { color: var(--muted); font-size: .9rem; }
.cards { list-style: none; margin: 0; padding: 0; display: grid; gap: .8rem; }
.card a { display: block; background: var(--card); border: 1px solid var(--line); border-radius: .7rem; padding: .9rem 1rem; text-decoration: none; color: inherit; }
.card a:hover { border-color: var(--accent); }
.card-title { display: block; font-size: 1.15rem; font-weight: 600; }
.card-meta { display: block; color: var(--muted); font-size: .85rem; margin: .15rem 0 .35rem; }
.card-summary { display: block; color: var(--fg); }
.controls { display: flex; gap: .8rem; align-items: center; flex-wrap: wrap; margin: 1rem 0; }
.hint { color: var(--muted); font-size: .85rem; }
button { font: inherit; font-size: .9rem; padding: .4em .9em; border-radius: .5em; border: 1px solid var(--line); background: var(--card); color: var(--fg); cursor: pointer; }
button:hover { border-color: var(--accent); }
button[aria-pressed="true"] { background: var(--accent); color: #fff; border-color: var(--accent); }
button.danger:hover { border-color: #c62828; color: #c62828; }

.w.g { cursor: pointer; border-radius: .2em; transition: background .1s, box-shadow .1s; }
.w.g:hover { background: var(--accent-soft); box-shadow: 0 1px 0 var(--gloss); }
.w.g.active { background: var(--accent-soft); box-shadow: 0 1.5px 0 var(--accent); }
.pop { position: absolute; z-index: 10; max-width: 20rem; background: var(--card); border: 1px solid var(--line); border-radius: .6rem; box-shadow: 0 8px 24px rgba(0,0,0,.15); padding: .7rem .85rem; font-size: .95rem; }
.pop .pw { font-weight: 700; font-family: Georgia, serif; font-size: 1.05rem; }
.pop .pp { color: var(--muted); font-size: .8rem; margin-left: .3em; }
.pop .pn { color: var(--muted); font-size: .85rem; margin-top: .3rem; }
.pop button { margin-top: .5rem; font-size: .8rem; }
.glossary dl { margin: 0; display: grid; gap: .45rem; }
.entry { display: grid; grid-template-columns: minmax(8rem, 12rem) 1fr; gap: .6rem; padding-bottom: .45rem; border-bottom: 1px dashed var(--line); }
.entry dt { font-family: Georgia, serif; font-weight: 600; }
.entry dt small { color: var(--muted); font-family: inherit; font-weight: normal; font-size: .75rem; }
.entry dd { margin: 0; }
.entry .note, .pop .pn { display: block; color: var(--muted); font-size: .88rem; }
.entry .save { font-size: .75rem; padding: .15em .6em; margin-top: .25rem; }
button.saved { color: var(--muted); border-style: dashed; cursor: default; }
.prose table { border-collapse: collapse; margin: .8rem 0; font-size: .95rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: .3rem .6rem; text-align: left; }
.prose th { background: var(--accent-soft); }
.prose code { background: var(--accent-soft); padding: .05em .3em; border-radius: .3em; }
.prose h1 { margin-top: 0; }
.prose h2 { margin-top: 1.6rem; }
#words ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .4rem; }
#words li { display: grid; grid-template-columns: 1fr auto; gap: .5rem; background: var(--card); border: 1px solid var(--line); border-radius: .5rem; padding: .5rem .8rem; }
#words .ww { font-family: Georgia, serif; font-weight: 600; }
#words .wr { color: var(--fg); }
#words .ws { color: var(--muted); font-size: .8rem; }
#words .del { font-size: .75rem; align-self: start; }
@media (max-width: 520px) { html { font-size: 16px; } .entry { grid-template-columns: 1fr; gap: .1rem; } .top nav a { margin-left: .6rem; font-size: .9rem; } }

/* quiz mode: Russian stays, Spanish is recalled rather than read */
body.quiz .es { filter: blur(5px); cursor: pointer; transition: filter .12s; }
body.quiz .s:hover .es, body.quiz .s.open .es { filter: none; }
body.quiz .ru { display: block; }
/* vocabulary page */
.cta-row { display: flex; gap: .7rem; flex-wrap: wrap; margin: 1.2rem 0 1.6rem; }
.cta { display: inline-block; background: var(--accent); color: #fff; text-decoration: none;
       padding: .55em 1.1em; border-radius: .5em; font-weight: 600; }
.cta.secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.unit-goal { font-size: .95rem; margin: .2rem 0 .6rem; }
.unit-readings { font-size: .9rem; margin: .2rem 0 .8rem; }
.vocab .entry { align-items: baseline; }
.vocab-entry.is-known { opacity: .5; }
body.hide-known .vocab-entry.is-known { display: none; }
.entry .known { font-size: .72rem; padding: .1em .55em; margin-left: .4rem; }
.vocab-entry.is-known .known { border-style: dashed; color: var(--muted); }
.tags { display: inline-flex; gap: .25rem; margin-left: .35rem; vertical-align: middle; }
.tag { font-size: .62rem; text-transform: uppercase; letter-spacing: .04em;
       padding: .1em .45em; border-radius: .35em; background: var(--accent-soft); color: var(--accent); }
.tag.t-porteño, .tag.t-voseo { background: var(--gloss); color: #fff; }
.tag.t-falso-amigo { background: #c62828; color: #fff; }

/* ---- audio ---- */

button.play { padding: 0; width: 1.5rem; height: 1.5rem; border-radius: 50%; font-size: .6rem;
              line-height: 1; color: var(--muted); margin-top: .45rem; }
button.play:hover { border-color: var(--accent); color: var(--accent); }
button.play.playing { background: var(--accent); border-color: var(--accent); color: #fff; }
button.play.no-audio { opacity: .3; cursor: default; }
button.play.tiny { width: 1.15rem; height: 1.15rem; font-size: .5rem; margin: 0 .25rem 0 0;
                   vertical-align: middle; }

#play-all[aria-pressed="true"] { background: var(--accent); color: #fff; border-color: var(--accent); }
.vocab .entry dt { display: flex; align-items: baseline; gap: .1rem; }

/* ---- review deck ---- */
.count.due { background: var(--gloss); }
#words li.is-due { border-left: 3px solid var(--gloss); }
.review-card { background: var(--card); border: 1px solid var(--line); border-radius: .8rem;
               padding: 2rem 1.2rem; text-align: center; }
.rc-count { color: var(--muted); font-size: .8rem; margin-bottom: 1rem; }
.rc-ru { font-size: 1.35rem; margin-bottom: 1.4rem; }
.rc-es { font-family: Georgia, serif; font-size: 1.7rem; color: var(--accent); margin-bottom: 1.4rem; }
.rc-reveal { font-size: 1rem; padding: .5em 1.6em; }
.rc-actions { display: flex; gap: .7rem; justify-content: center; }
.rc-actions .good:hover { border-color: var(--a1); color: var(--a1); }
.rc-actions .bad:hover { border-color: #c62828; color: #c62828; }
.card-done { text-align: center; padding: 2rem 1rem; background: var(--card);
             border: 1px solid var(--line); border-radius: .8rem; }


/* ================= conversation view =================
   These texts are dialogues meant to be read aloud, so they are laid out as
   speech turns rather than as a numbered list. The em-dash that opens each
   Spanish line becomes structure (an indent + a speaker rule) instead of
   dangling punctuation, and the two speakers alternate so the eye can follow
   who is talking without reading the words. */
.sentences { list-style: none; margin: 1.4rem 0 0; padding: 0; }

.s { position: relative; display: grid; grid-template-columns: 1.7rem 1fr;
     gap: .55rem; align-items: start; padding: .1rem 0; margin-bottom: .1rem; }
.s-body { position: relative; border-left: 2px solid transparent; padding: .5rem .8rem .5rem .9rem;
          border-radius: .1rem .55rem .55rem .1rem; transition: background .12s; }
.s:hover .s-body { background: color-mix(in srgb, var(--card) 70%, transparent); }

.s.turn.sp0 .s-body { border-left-color: var(--accent); }
.s.turn.sp1 .s-body { border-left-color: var(--gloss); }
.s.turn.sp1 { margin-left: 1.6rem; }
.s.narr .s-body { border-left-color: var(--line); font-style: normal; }

.es { margin: 0; font-family: Georgia, "Times New Roman", serif;
      font-size: 1.2rem; line-height: 1.65; }
.s.turn.sp1 .es { color: var(--fg); }
.ru { margin: .35rem 0 0; color: var(--ru); font-size: .97rem; display: none; }
.s.open .ru, body.show-ru .ru { display: block; }

/* the line number is reference, not furniture: small, muted, out of the way */
.s .n { position: absolute; top: .35rem; right: .45rem; padding: 0; width: auto;
        min-width: 1.1rem; height: 1.1rem; border: 0; background: none;
        color: var(--muted); font-size: .68rem; opacity: .35; border-radius: .3em; }
.s:hover .n, .s.open .n { opacity: 1; }
.s.open .n { color: var(--accent); font-weight: 700; }

.s.speaking .s-body { background: var(--accent-soft); }
.s.speaking .es { color: var(--fg); }

button.play { margin-top: .55rem; opacity: .35; }
.s:hover button.play, button.play.playing { opacity: 1; }

.reading-head { border-bottom: 1px solid var(--line); padding-bottom: .9rem; }
.reading-head .controls { gap: .5rem; }
.reading-head .controls button { font-size: .82rem; }

@media (max-width: 560px) {
  .s { grid-template-columns: 1.5rem 1fr; gap: .35rem; }
  .s.turn.sp1 { margin-left: .8rem; }
  .s-body { padding: .45rem .55rem .45rem .7rem; }
  .es { font-size: 1.12rem; }
}

/* ---- word list under a reading ---- */
.wordlist { list-style: none; margin: .6rem 0 0; padding: 0; }
.wl { display: grid; grid-template-columns: 1.3rem 1fr 1.7rem; gap: .5rem;
      align-items: start; padding: .5rem .2rem; border-bottom: 1px solid var(--line); }
.wl:hover { background: color-mix(in srgb, var(--card) 70%, transparent); }
.wl button.play { margin-top: .15rem; }
.wl-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: .1rem .45rem; }
.wl-es { font-family: Georgia, serif; font-weight: 600; font-size: 1.05rem; }
.wl-pos { color: var(--muted); font-size: .72rem; }
.wl-ru { color: var(--fg); }
.wl-note { color: var(--muted); font-size: .87rem; margin-top: .2rem; line-height: 1.45; }
.wl .save { font-size: .85rem; line-height: 1; padding: .15em .45em; width: 1.7rem;
            color: var(--muted); opacity: .45; }
.wl:hover .save { opacity: 1; }
.wl .save.saved { opacity: 1; color: var(--a1); border-style: dashed; }
@media (max-width: 560px) { .wl { grid-template-columns: 1.2rem 1fr 1.6rem; } }

/* ---- "words from earlier lessons" disclosure ---- */
.known-words { margin-top: 1.6rem; border-top: 1px solid var(--line); padding-top: .8rem; }
.known-words summary { cursor: pointer; color: var(--muted); font-size: .92rem;
                       list-style: none; display: flex; align-items: center; gap: .4rem; }
.known-words summary::-webkit-details-marker { display: none; }
.known-words summary::before { content: "▸"; font-size: .8em; transition: transform .15s; }
.known-words[open] summary::before { transform: rotate(90deg); }
.known-words summary:hover { color: var(--accent); }
.known-words .cnt { background: var(--accent-soft); color: var(--accent);
                    border-radius: 1em; padding: 0 .5em; font-size: .78rem; }
.reading-head .hint { margin: .5rem 0 0; }

/* tighter conversation rhythm; the turns were floating too far apart to read
   as a single exchange */
.s { padding: 0; margin-bottom: 0; }
.s-body { padding: .3rem .8rem .3rem .85rem; }
.s.turn.sp1 { margin-left: 1.2rem; }
.sentences { margin-top: 1rem; }
button.play { margin-top: .35rem; }
.s .n { top: .2rem; }

/* ---- progress through the course ---- */
.continue { display: flex; align-items: center; gap: .7rem; flex-wrap: wrap;
            background: var(--card); border: 1px solid var(--line);
            border-left: 3px solid var(--accent); border-radius: .6rem;
            padding: .8rem 1rem; margin: 1.2rem 0 1rem; }
.continue-label { color: var(--muted); font-size: .82rem; text-transform: uppercase;
                  letter-spacing: .05em; }
.card { position: relative; }
.read-tick { position: absolute; top: .7rem; right: .9rem; color: var(--a1);
             font-weight: 700; opacity: 0; transition: opacity .12s; }
.card.is-read .read-tick { opacity: 1; }
.card.is-read a { opacity: .62; }
.card.is-read a:hover { opacity: 1; }
.reading-foot { display: flex; align-items: center; gap: .8rem; flex-wrap: wrap;
                margin-top: 2.2rem; padding-top: 1.1rem; border-top: 1px solid var(--line); }
#mark-read.done { background: var(--a1); color: #fff; border-color: var(--a1); }
.cta-row .cnt { background: var(--gloss); color: #fff; }