:root {
  --bg: #f6f5f1;
  --card: #ffffff;
  --text: #1d2327;
  --muted: #69717a;
  --line: #e3e1da;
  --accent: #2f6fdb;
  --accent-soft: #e6eefc;
  --good: #1f8a4c;
  --good-soft: #e3f4ea;
  --bad: #c2412d;
  --bad-soft: #fbe9e5;
  --warn-soft: #fff5d9;
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141619;
    --card: #1d2024;
    --text: #e8e9ea;
    --muted: #9aa1a8;
    --line: #30343a;
    --accent: #6b9cf0;
    --accent-soft: #1f2b40;
    --good: #52c07e;
    --good-soft: #17301f;
    --bad: #ef7a66;
    --bad-soft: #3a1f1a;
    --warn-soft: #3a3217;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
h1 { font-size: 1.6rem; margin: 0 0 .4rem; line-height: 1.25; }
h2 { font-size: 1.2rem; margin: 0 0 .6rem; }
h3 { font-size: 1.05rem; margin: 1.4rem 0 .4rem; }
.muted { color: var(--muted); }
.small, small { font-size: .85rem; }
.hidden { display: none !important; }

.top { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; padding: .6rem 1rem; background: var(--card); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; text-decoration: none; color: var(--text); }
nav { display: flex; gap: .2rem; flex-wrap: wrap; flex: 1; }
nav a { text-decoration: none; color: var(--muted); padding: .3rem .6rem; border-radius: 8px; }
nav a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.sync { font-size: .8rem; color: var(--muted); }
.sync.ok { color: var(--good); }
.sync.bad { color: var(--bad); }
body.logged-out .top nav, body.logged-out #logout, body.logged-out .sync { display: none; }

main { max-width: 820px; margin: 0 auto; padding: 1rem 16px 5rem; }
.stack > * + * { margin-top: 1rem; }
.loading { padding: 3rem; text-align: center; color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.2rem; }
.card.hero { background: linear-gradient(135deg, var(--accent-soft), var(--card)); }
.eyebrow { text-transform: uppercase; letter-spacing: .06em; font-size: .78rem; color: var(--muted); }
.warn { background: var(--warn-soft); border-radius: 10px; padding: .7rem .9rem; margin: .5rem 0; }
.card.warn { border-color: transparent; }
.ok-note { background: var(--good-soft); border-radius: 10px; padding: .6rem .9rem; }
.done-card { background: var(--good-soft); }
.note { background: var(--accent-soft); border-radius: 8px; padding: .4rem .7rem; margin-top: .4rem; font-size: .92rem; }

.btn { display: inline-flex; align-items: center; gap: .3rem; font: inherit; font-size: .95rem; padding: .5rem 1rem; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--text); cursor: pointer; text-decoration: none; }
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn:disabled { opacity: .55; cursor: default; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.good { border-color: var(--good); color: var(--good); }
.btn.bad { border-color: var(--bad); color: var(--bad); }
.btn.small { padding: .2rem .6rem; font-size: .85rem; }
.btn.big { padding: .75rem 1.4rem; font-size: 1.05rem; font-weight: 600; }
.btn.icon { padding: .1rem .4rem; font-size: .9rem; border-color: transparent; background: transparent; }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.mic { border-color: var(--accent); color: var(--accent); font-weight: 600; }
.btn.mic.rec { background: var(--bad); border-color: var(--bad); color: #fff; animation: pulse 1.2s infinite; }
@keyframes pulse { 50% { opacity: .75; } }
.row { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; margin: .5rem 0; }

.seg { display: flex; flex-wrap: wrap; gap: .3rem; margin-top: .3rem; }
.seg button { font: inherit; font-size: .85rem; padding: .25rem .7rem; border-radius: 999px; border: 1px solid var(--line); background: var(--card); color: var(--text); cursor: pointer; }
.seg button.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.meter { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; margin: .6rem 0 .2rem; }
.meter > div { height: 100%; background: var(--good); transition: width .3s; }

.tasks { list-style: none; padding: 0; margin: 0; }
.tasks li + li { border-top: 1px solid var(--line); }
.tasks a { display: flex; align-items: center; gap: .8rem; padding: .7rem .2rem; text-decoration: none; color: var(--text); }
.tasks a:hover { background: var(--accent-soft); border-radius: 8px; }
.tasks .ticon { font-size: 1.3rem; width: 1.8rem; text-align: center; }
.tasks .tmain { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.tasks .tmain small { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tasks .tmin { color: var(--muted); font-variant-numeric: tabular-nums; }
.tasks li.done .tmain b { text-decoration: line-through; color: var(--muted); }

.week { display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: .5rem; margin-bottom: .6rem; }
.wday { border: 1px solid var(--line); border-radius: 10px; padding: .5rem; display: flex; flex-direction: column; }
.wday.free { background: var(--good-soft); }
.wday.busy { background: var(--warn-soft); }
.wday small { color: var(--muted); }

.taskbar { display: flex; justify-content: space-between; align-items: center; gap: .6rem; flex-wrap: wrap; }
.timer { font-variant-numeric: tabular-nums; color: var(--muted); }
.timer.big { font-size: 1.3rem; }
.steps { color: var(--muted); font-size: .92rem; padding-left: 1.2rem; }

.mcq { margin: 1rem 0; }
.mcq-q { margin-bottom: .4rem; }
.mcq-opts { display: grid; gap: .35rem; }
.opt { text-align: left; font: inherit; padding: .5rem .8rem; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--text); cursor: pointer; }
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt.chosen { border-color: var(--accent); background: var(--accent-soft); }
.opt.right { border-color: var(--good); background: var(--good-soft); }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt:disabled { cursor: default; }
.explain { font-size: .9rem; color: var(--muted); margin-top: .3rem; }
.score { font-weight: 700; font-size: 1.1rem; margin: 1rem 0; }

.player { display: flex; gap: .8rem; align-items: center; flex-wrap: wrap; margin: .8rem 0; padding: .7rem; background: var(--accent-soft); border-radius: 10px; }
.player select { font: inherit; padding: .2rem; border-radius: 6px; }
.transcript { border-left: 3px solid var(--accent); padding-left: .8rem; margin: .5rem 0; }
.tline { padding: .2rem .3rem; border-radius: 6px; }
.tline.now { background: var(--warn-soft); }
.passage { font-size: 1.05rem; line-height: 1.7; background: var(--bg); border-radius: 10px; padding: .6rem 1rem; }
.section { border-top: 1px solid var(--line); padding-top: .6rem; margin-top: 1rem; }
.gloss { padding-left: 1.2rem; }
.gloss li { margin: .3rem 0; }
.gloss .btn { margin-left: .4rem; }

.flash { text-align: center; padding: 1.5rem 1rem; border: 1px solid var(--line); border-radius: var(--radius); margin: .8rem 0; }
.flash .word { font-size: 2rem; font-weight: 700; }
.card-back { margin-top: 1rem; }
.card-back .vi { font-size: 1.25rem; font-weight: 600; color: var(--accent); }
.card-back .ex { margin-top: .6rem; font-style: italic; }
.grades { display: grid; grid-template-columns: repeat(4, 1fr); gap: .4rem; }
.grades .btn { justify-content: center; }
.badge { display: inline-block; font-size: .78rem; padding: .05rem .5rem; border-radius: 99px; background: var(--accent-soft); color: var(--accent); margin-left: .4rem; }
.badge.good { background: var(--good-soft); color: var(--good); }
.badge.bad { background: var(--bad-soft); color: var(--bad); }
.badge.wait { background: var(--line); color: var(--muted); }

.phrase, .dl { padding: .6rem 0; border-bottom: 1px dashed var(--line); }
.dl.you { background: var(--accent-soft); border-radius: 8px; padding: .6rem; margin: .3rem 0; border: none; }
.speak-check .target { font-size: 1.08rem; font-weight: 500; }
.speak-check .said { font-size: .9rem; color: var(--muted); display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
.w-ok { color: var(--good); }
.w-miss { color: var(--bad); text-decoration: underline wavy; }
.vi-prompt { font-weight: 600; }
.hint { color: var(--muted); font-size: .9rem; }
.sticky-bottom { position: sticky; bottom: 0; background: var(--card); border-top: 1px solid var(--line); padding: .7rem 0; margin-top: 1rem; display: flex; justify-content: space-between; align-items: center; gap: .5rem; flex-wrap: wrap; }
.live { min-height: 3rem; background: var(--bg); border-radius: 10px; padding: .6rem .8rem; margin: .5rem 0; font-size: .95rem; }
.chips { display: flex; flex-wrap: wrap; gap: .35rem; margin: .4rem 0; }
.chip { font-size: .85rem; padding: .15rem .6rem; border-radius: 99px; border: 1px solid var(--line); }
.chip.good { background: var(--good-soft); border-color: var(--good); color: var(--good); }
.stats { display: flex; gap: 1.5rem; margin: .8rem 0; }
.stats div { display: flex; flex-direction: column; }
.stats b { font-size: 1.5rem; }

.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: .7rem; }
.tile { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: .8rem 1rem; display: flex; flex-direction: column; }
.tile b { font-size: 1.7rem; line-height: 1.2; margin: .2rem 0; }
.tile small { color: var(--muted); }
b.big { font-size: 1.6rem; }

.tbl { border-collapse: collapse; width: 100%; font-size: .92rem; }
.tbl th, .tbl td { text-align: left; padding: .4rem .5rem; border-bottom: 1px solid var(--line); }
.tbl tr.sum td { border-top: 2px solid var(--line); }
.scroll-x { overflow-x: auto; }
.num { width: 4.2rem; font: inherit; padding: .2rem .3rem; border: 1px solid var(--line); border-radius: 6px; background: var(--card); color: var(--text); }
.grid2 { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: .6rem; }
.field { display: flex; flex-direction: column; gap: .2rem; font-size: .9rem; }
select, input[type=search], input[type=password], textarea { font: inherit; padding: .45rem .6rem; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--text); }
textarea, input[type=search] { width: 100%; margin: .3rem 0 .8rem; }
.daylist { display: grid; gap: .3rem; }
.dayrow { display: grid; grid-template-columns: 1fr auto 3.5rem; gap: .5rem; align-items: center; padding: .25rem .4rem; border-radius: 8px; }
.dayrow.custom { background: var(--accent-soft); }
.wordlist .wrow { display: flex; align-items: center; gap: .6rem; padding: .5rem 0; border-bottom: 1px solid var(--line); }
.wordlist .wrow > div { flex: 1; }
.report { white-space: pre-wrap; font-size: .8rem; background: var(--bg); padding: .8rem; border-radius: 8px; max-height: 400px; overflow: auto; }
.video { position: relative; padding-top: 56.25%; margin: .8rem 0; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; border-radius: 10px; }
.login { max-width: 360px; margin: 4rem auto; display: flex; flex-direction: column; gap: .7rem; text-align: center; }
.error { color: var(--bad); min-height: 1.2em; }
.toast { position: fixed; left: 50%; bottom: 1.5rem; transform: translateX(-50%); background: var(--text); color: var(--bg); padding: .6rem 1.1rem; border-radius: 10px; z-index: 100; font-size: .92rem; max-width: 90vw; }
details summary { cursor: pointer; color: var(--accent); margin: .4rem 0; }

@media (max-width: 560px) {
  .top { gap: .4rem; padding: .5rem 12px; }
  nav a { padding: .25rem .45rem; font-size: .9rem; }
  h1 { font-size: 1.35rem; }
  .card { padding: .9rem; }
  .grades { grid-template-columns: repeat(2, 1fr); }
}