:root {
  --green: #a87c5f;
  --green-dark: color-mix(in srgb, var(--green) 72%, black);
  --red: #a85a5f;
  --orange: #d6a17c;
  --yellow-bg: #fcf9ee;
  --yellow-bd: #e6d59a;
  --md-bg: linear-gradient(180deg, #faf1e8, #fdf8f3);
  --badge: #f1e4d8;
  --bg: #f7f7f4;
  --card: #fff;
  --ink: #2a2d31;
  --muted: #74787f;
  --line: #e7e7e3;
  --ok: #4c8a5b;
  --ko: #b85c5c;
  --fs: 17px;
  color-scheme: light;
}
html[data-theme="dark"] {
  --green-dark: color-mix(in srgb, var(--green) 70%, white);
  --red: #d49a9d;
  --orange: #b98d6c;
  --yellow-bg: #2a2821;
  --yellow-bd: #6e6440;
  --md-bg: linear-gradient(180deg, #2c2721, #26231f);
  --badge: #3a332d;
  --bg: #16181b;
  --card: #1f2226;
  --ink: #e4e5e7;
  --muted: #9a9ea5;
  --line: #33363b;
  --ok: #7fb58c;
  --ko: #d48a8a;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { font-size: var(--fs); }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 1rem/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}
button { font: inherit; cursor: pointer; }
.topbar {
  position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between;
  padding: .5rem 1rem; padding-top: max(.5rem, env(safe-area-inset-top));
  background: var(--green); color: #fff;
}
.brand {
  color: #fff; text-decoration: none; font-weight: 700; flex: 1; min-width: 0; line-height: 1.2; margin-right: .3rem;
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden;
}
.tools { flex: none; display: flex; }
.brand span { font-weight: 400; opacity: .85; }
.lib { color: #fff; text-decoration: none; font-size: .85rem; opacity: .85; padding: .2rem .55rem;
       margin-right: .5rem; border-radius: 8px; background: rgba(255, 255, 255, .16); white-space: nowrap; }
.lib:hover { opacity: 1; }
.tools button { background: rgba(255,255,255,.2); border: 0; color: #fff; border-radius: 6px; padding: .2rem .55rem; margin-left: .3rem; }
@media (max-width: 480px) {
  .brand { font-size: .88rem; }
  .lib { padding: .2rem .6rem; margin-right: .55rem; }
  .lib span { display: none; }
  .tools button { padding: .2rem .45rem; margin-left: .25rem; }
}
main { max-width: 760px; margin: 0 auto; padding: 1rem .9rem 5rem; }

/* home */
.unit-list { list-style: none; padding: 0; margin: 0; }
.unit-list a {
  display: flex; gap: .9rem; align-items: center; padding: .8rem 1rem; margin-bottom: .6rem;
  background: var(--card); border-radius: 12px; text-decoration: none; color: inherit;
  box-shadow: 0 1px 2px rgba(0,0,0,.06);
}
.unit-list .num {
  flex: none; width: 2.4rem; height: 2.4rem; border-radius: 50%; background: var(--green); color: #fff;
  display: grid; place-items: center; font-weight: 700;
}
.unit-list .pages { margin-left: auto; color: var(--muted); font-size: .8rem; }
.unit-list .progress { color: var(--muted); font-size: .8rem; }

.section-title { font-size: 1rem; color: var(--green-dark); margin: 1.4rem 0 .6rem; text-transform: none; }

/* unit */
.unit-head { display: flex; align-items: center; gap: .9rem; margin: .5rem 0 1.2rem; }
.unit-head .num {
  width: 3.2rem; height: 3.2rem; border-radius: 50%; background: var(--green); color: #fff;
  display: grid; place-items: center; font-size: 1.6rem; font-weight: 800; flex: none;
}
.unit-head h1 { margin: 0; color: var(--red); font-size: 1.6rem; line-height: 1.2; }
.scans-btn {
  margin-left: auto; flex: none; font: inherit; font-size: .8rem; color: var(--muted); cursor: pointer;
  background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: .3rem .7rem;
}
.scans-btn:hover { color: var(--ink); border-color: var(--muted); }
body.no-scroll { overflow: hidden; }
.scan-viewer { position: fixed; inset: 0; z-index: 50; background: rgba(20,22,25,.94); display: flex; flex-direction: column; }
.scan-bar {
  display: flex; align-items: center; justify-content: space-between; color: #eee; font-size: .9rem;
  padding: .5rem .9rem; padding-top: max(.5rem, env(safe-area-inset-top));
}
.scan-bar button { font: inherit; font-size: 1.1rem; background: none; border: 0; color: #eee; cursor: pointer; padding: .2rem .5rem; }
.scan-pages { flex: 1; overflow: auto; -webkit-overflow-scrolling: touch; padding: 0 .6rem 2rem; }
.scan-pages figure { margin: 0 auto 1.2rem; max-width: 900px; }
.scan-pages img { display: block; width: 100%; background: #fff; border-radius: 4px; cursor: zoom-in; }
.scan-pages img.zoom { width: 200%; max-width: none; cursor: zoom-out; }
.scan-pages figcaption { color: #aaa; font-size: .75rem; text-align: center; margin-top: .3rem; }
.page-tag { color: var(--muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; margin: 1.6rem 0 .5rem; }
.activities-banner {
  background: var(--green); color: #fff; font-weight: 700; letter-spacing: .35em; text-align: center;
  padding: .3rem; border-radius: 6px; margin: 1.6rem 0 1rem;
}

.card { background: var(--card); border-radius: 14px; padding: 1rem 1.1rem; margin-bottom: 1rem; box-shadow: 0 1px 3px rgba(0,0,0,.07); }
.card h2 { margin: 0 0 .6rem; font-size: 1.15rem; color: var(--red); display: flex; align-items: center; gap: .5rem; }
.card h2 .badge {
  background: var(--badge); color: var(--red); border-radius: 4px; padding: 0 .45rem; font-size: 1rem;
}
.dialogue { border-left: 5px solid var(--accent, var(--green)); }
.photo { width: 100%; max-width: 240px; border-radius: 8px; margin: .2rem 0 .8rem; display: block; }
@media (min-width: 600px) {
  .dialogue .photo, .text-block .photo { float: right; max-width: 200px; margin: 0 0 .6rem 1rem; }
  .dialogue::after, .text-block::after { content: ""; display: block; clear: both; }
}
.lines { margin: 0; }
.line { margin: .35rem 0; }
.speaker {
  display: inline-block; font-weight: 700; font-size: .85rem; padding: 0 .5rem; border-radius: 999px;
  margin-right: .4rem; color: #fff; background: var(--c);
}
.line .txt b, .text-block b, .box b, .item b { font-weight: 700; }
mark { background: none; color: var(--red); font-weight: 700; }
.text-block p { margin: .4rem 0; }

.box { border-radius: 12px; padding: .8rem 1.1rem; margin-bottom: 1rem; }
.box h3 { margin: 0 0 .4rem; font-size: 1.05rem; }
.box h4 { margin: .6rem 0 .2rem; font-size: .95rem; }
.box ul { margin: .2rem 0; padding-left: 1.2rem; }
.box li { margin: .15rem 0; }
.box .photo { max-width: min(100%, 560px); background: #fff; }
.box.vocabulaire { background: var(--yellow-bg); border: 2px solid var(--yellow-bd); }
.box.vocabulaire h3 { color: var(--red); }
.box.vocabulaire li::marker { color: var(--yellow-bd); }
.box.grammaire { background: var(--card); border: 2px solid var(--red); }
.box.grammaire h3 { color: var(--red); }
.box.grammaire li::marker { color: var(--red); }
.box.manieres_de_dire { background: var(--md-bg); border: 2px solid var(--orange); }
.box.manieres_de_dire h3 { color: var(--red); font-style: italic; text-align: center; }
.box.manieres_de_dire li::marker { color: var(--orange); }

@media (min-width: 600px) {
  .box.two-col ul { columns: 2; column-gap: 2rem; }
  .box.two-col li { break-inside: avoid; }
  .box-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; align-items: start; }
  .box-row .box { margin-bottom: 1rem; height: calc(100% - 1rem); }
}
s { text-decoration-thickness: 2px; color: var(--muted); }
.box table, .text-block table { border-collapse: collapse; margin: .2rem 0 .6rem; }
.box td, .box th, .text-block td, .text-block th { padding: .05rem 1rem .05rem 0; vertical-align: top; text-align: left; }
/* audio player */
.player {
  display: flex; align-items: center; gap: .4rem; flex-wrap: wrap;
  background: var(--bg); border-radius: 12px; padding: .45rem .6rem; margin: 0 0 .8rem;
}
.player button {
  border: 0; background: var(--card); color: var(--ink); border-radius: 50%; width: 2.3rem; height: 2.3rem;
  display: grid; place-items: center; font-size: .75rem; font-weight: 700; box-shadow: 0 1px 2px rgba(0,0,0,.12);
}
.player button.play { background: var(--accent, var(--green)); color: #fff; width: 2.7rem; height: 2.7rem; font-size: 1rem; }
.player button.skip { background: transparent; box-shadow: none; color: var(--ink); opacity: .7; width: 2.2rem; padding: 0; }
.player button.skip:hover { opacity: 1; }
.player button svg { display: block; }
.player button.speed { border-radius: 8px; width: auto; padding: 0 .5rem; }
.player button.loop.on { background: var(--accent, var(--green)); color: #fff; }
.player .bar { flex: 1 1 4rem; min-width: 3rem; accent-color: var(--accent, var(--green)); }
.player .time { font-variant-numeric: tabular-nums; font-size: .8rem; color: var(--muted); min-width: 5.5rem; text-align: right; }

/* exercises */
.exercise h2 { color: var(--ink); font-size: 1rem; display: block; }
.exercise h2 .num {
  display: inline-grid; place-items: center; width: 1.6rem; height: 1.6rem; border-radius: 50%;
  background: var(--green); color: #fff; margin-right: .4rem; font-size: .9rem;
}
.exercise h2 .cat { color: var(--green-dark); }
.items { list-style: none; padding: 0; margin: .6rem 0 0; }
.item { padding: .55rem 0; border-top: 1px solid var(--line); }
.item .n { font-weight: 700; margin-right: .3rem; }
.item.ok .n { color: var(--ok); }
.item.ko .n { color: var(--ko); }
.item .photo { max-width: 220px; }
.tf { display: inline-flex; flex-wrap: wrap; gap: .4rem; margin-left: .3rem; vertical-align: middle; }
.chip {
  border: 1.5px solid var(--line); background: var(--card); color: var(--ink); border-radius: 999px;
  padding: .05rem .7rem; font-size: .9rem;
}
.chip.sel { border-color: var(--green-dark); background: var(--green); color: #fff; }
.chip.right { border-color: var(--ok); background: var(--ok); color: #fff; }
.chip.wrong { border-color: var(--ko); background: var(--ko); color: #fff; }
input.blank {
  font: inherit; border: 0; border-bottom: 2px solid var(--muted); background: transparent; color: var(--ink);
  min-width: 5.5rem; width: 7rem; max-width: 100%; padding: 0 .2rem; text-align: center;
}
input.blank.right { border-color: var(--ok); color: var(--ok); }
input.blank.wrong { border-color: var(--ko); color: var(--ko); }
textarea {
  display: block; width: 100%; margin-top: .4rem; font: inherit; font-size: .95rem; color: var(--ink);
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: .4rem .6rem; min-height: 2.6rem; resize: vertical;
}
.key {
  display: none; margin-top: .4rem; padding: .45rem .7rem; border-radius: 8px;
  background: rgba(134,160,110,.12); border-left: 3px solid var(--green); font-size: .93rem;
}
.show-key .key { display: block; }
.key .expl { color: var(--muted); font-size: .88rem; margin-top: .15rem; }
.ex-actions { display: flex; gap: .5rem; margin-top: .8rem; flex-wrap: wrap; align-items: center; }
.ex-actions button {
  border: 0; border-radius: 8px; padding: .35rem .9rem; background: var(--green); color: #fff; font-weight: 600;
}
.ex-actions button.secondary { background: var(--bg); color: var(--ink); border: 1px solid var(--line); }
.ex-actions .score { color: var(--muted); font-size: .9rem; }
.ex-actions button.reset {
  margin-left: auto; background: none; border: 0; padding: .2rem 0; color: var(--muted);
  font-size: .8rem; text-decoration: underline; text-underline-offset: 2px; opacity: .8;
}
.ex-actions button.reset:hover { opacity: 1; }
.unit-list .seen { margin-left: auto; font-style: italic; color: #a9adb3; font-size: .78rem; white-space: nowrap; }
.unit-list .seen + .pages { margin-left: .9rem; }
.unit-list .tick { font-style: normal; color: #93c47d; font-weight: 700; }
.ai-note { color: var(--muted); font-size: .75rem; }
details.transcript { margin: .5rem 0; font-size: .93rem; }
details.transcript summary { cursor: pointer; color: var(--green-dark); font-weight: 600; }
details.transcript p { margin: .4rem 0; }
.unlock { max-width: 360px; margin: 3rem auto; display: flex; flex-direction: column; gap: .7rem; }
.unlock h2 { color: var(--ink); }
.unlock .pw {
  font: inherit; padding: .6rem .8rem; border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg); color: var(--ink);
}
.unlock button { border: 0; border-radius: 10px; padding: .6rem; background: var(--green); color: #fff; font-weight: 700; }
.pw-msg { margin: 0; color: var(--ko); min-height: 1.4em; }
.nav {
  display: flex; justify-content: space-between; align-items: baseline; gap: .8rem; margin: .2rem -.9rem 1rem; font-size: .85rem;
  position: sticky; top: var(--topbar-h, 3rem); z-index: 9; background: var(--bg); padding: .55rem .9rem;
  border-bottom: 1px solid var(--line);
}
.nav > * { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav > :last-child { text-align: right; }
.nav > .toc-link { flex: none; font-weight: 400; color: var(--muted); }
.nav a { color: var(--green-dark); font-weight: 600; text-decoration: none; }