:root {
  --bg: #f6f3ec; --card: #ffffff; --ink: #16181d; --muted: #5b6270; --line: #d9d4c7;
  --pri: #1746d1; --pri-ink: #ffffff; --pri-soft: #e4ebff;
  --nl: #0f3fb8; --nl-line: #8aa5ee;
  --ok: #12804a; --ok-soft: #dff5e8; --bad: #c2372b; --bad-soft: #fde6e3;
  --acc: #f37021; --acc-soft: #ffeedd;
  --tip-bg: #16181d; --tip-ink: #ffffff;
  --r: 18px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161b; --card: #1e2128; --ink: #f1f1ee; --muted: #a4abb8; --line: #3a3f4b;
    --pri: #7da2ff; --pri-ink: #0c1020; --pri-soft: #24304f;
    --nl: #9db8ff; --nl-line: #5874c4;
    --ok: #52d08f; --ok-soft: #173526; --bad: #ff8a7d; --bad-soft: #442320;
    --acc: #ff9a55; --acc-soft: #43301f;
    --tip-bg: #f1f1ee; --tip-ink: #14161b;
  }
}
* { box-sizing: border-box; }
html { font-size: 20px; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; line-height: 1.55; -webkit-font-smoothing: antialiased; }
button, input, textarea, select { font: inherit; color: inherit; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: 0 0 .4em; letter-spacing: -.01em; }
h2 { font-size: 1.35rem; line-height: 1.25; margin: 1.6em 0 .6em; }
h3 { font-size: 1.1rem; margin: 1.2em 0 .4em; }
p { margin: 0 0 .8em; }
a { color: var(--pri); }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.center { text-align: center; }

/* top bar */
#bar { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 10px; padding: 10px 16px; background: var(--bg); border-bottom: 2px solid var(--line); }
#crumb { flex: 1; min-width: 0; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--muted); }
.bar-r { display: flex; gap: 8px; }
.barbtn { border: 2px solid var(--line); background: var(--card); border-radius: 12px; padding: 8px 14px; font-weight: 700; font-size: .85rem; cursor: pointer; white-space: nowrap; }
.barbtn:hover { border-color: var(--pri); }
.barbtn.on { background: var(--pri); color: var(--pri-ink); border-color: var(--pri); }
@media (max-width: 720px) { #b-focus, #crumb { display: none; } .bar-r { margin-left: auto; } }

#view { max-width: 860px; margin: 0 auto; padding: 28px 16px 120px; }

/* cards / rows */
.card { background: var(--card); border: 2px solid var(--line); border-radius: var(--r); padding: 24px; margin: 0 0 18px; }
.card > :last-child { margin-bottom: 0; }
.card h2:first-child, .card h3:first-child { margin-top: 0; }
.row { display: flex; align-items: center; gap: 16px; width: 100%; text-align: left; background: var(--card); border: 2px solid var(--line); border-radius: var(--r); padding: 16px 20px; margin: 0 0 12px; cursor: pointer; min-height: 76px; }
.row:hover { border-color: var(--pri); }
.row .ico { font-size: 1.8rem; width: 2.2rem; text-align: center; flex: none; }
.row .txt { flex: 1; min-width: 0; }
.row .t { font-weight: 800; font-size: 1.08rem; display: block; }
.row .s { color: var(--muted); font-size: .88rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.row .go { flex: none; font-weight: 800; color: var(--pri); white-space: nowrap; }
.row.done { opacity: .62; }
.row.done .go { color: var(--ok); }
.row.next { border-color: var(--pri); border-width: 3px; background: var(--pri-soft); }
.row.next .go { background: var(--pri); color: var(--pri-ink); padding: 10px 18px; border-radius: 12px; }

.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.tile { display: block; text-align: left; background: var(--card); border: 2px solid var(--line); border-radius: var(--r); padding: 18px; cursor: pointer; }
.tile:hover { border-color: var(--pri); }
.tile .ico { font-size: 2rem; }
.tile .t { font-weight: 800; font-size: 1.1rem; display: block; margin: 4px 0 2px; }
.tile .s { color: var(--muted); font-size: .85rem; display: block; margin-bottom: 10px; }

.bar-p { height: 12px; background: var(--line); border-radius: 99px; overflow: hidden; }
.bar-p > i { display: block; height: 100%; background: var(--ok); border-radius: 99px; transition: width .3s; }
.bar-p.big { height: 16px; margin: 0 0 22px; }
.bar-p.big > i { background: var(--acc); }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 60px; padding: 12px 26px; border-radius: 16px; border: 2px solid var(--line); background: var(--card); font-weight: 800; font-size: 1.05rem; cursor: pointer; }
.btn:hover { border-color: var(--pri); }
.btn.pri { background: var(--pri); color: var(--pri-ink); border-color: var(--pri); }
.btn.ok { background: var(--ok); color: #fff; border-color: var(--ok); }
.btn.warn { background: var(--acc-soft); border-color: var(--acc); }
.btn.wide { width: 100%; }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btns { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
.btns .btn { flex: 1; }
.linkbtn { background: none; border: 0; padding: 0; color: var(--pri); font-weight: 700; cursor: pointer; text-decoration: underline; }

/* Dutch text */
.nl { color: var(--nl); font-weight: 600; }
.nl .w { border-bottom: 2px dotted var(--nl-line); cursor: help; border-radius: 4px; padding: 0 1px; }
.nl .w:hover, .nl .w.hot { background: var(--acc-soft); border-bottom-color: var(--acc); }
button .nl, .opt .nl { color: inherit; }
.blank { display: inline-block; min-width: 3.5em; border-bottom: 4px solid var(--acc); margin: 0 4px; height: 1em; vertical-align: baseline; }
.nlb { display: flex; gap: 12px; align-items: flex-start; margin: 10px 0; font-size: 1.12rem; }
.nlb-t { flex: 1; min-width: 0; }
.nlb .en { color: var(--muted); font-size: .88rem; font-weight: 400; }
.spk { flex: none; width: 46px; height: 46px; border-radius: 50%; border: 2px solid var(--line); background: var(--card); cursor: pointer; font-size: 1.1rem; line-height: 1; }
.spk:hover { border-color: var(--pri); background: var(--pri-soft); }
#tip { position: fixed; z-index: 100; display: none; max-width: 360px; background: var(--tip-bg); color: var(--tip-ink); padding: 10px 14px; border-radius: 12px; font-size: .95rem; line-height: 1.35; pointer-events: none; box-shadow: 0 6px 24px rgba(0,0,0,.25); }
#tip b { display: block; font-size: 1.1rem; }
#tip span { display: block; opacity: .8; font-size: .85rem; margin-top: 4px; }

/* lesson player */
.stage { min-height: 320px; }
.stage h2 { margin-top: 0; font-size: 1.5rem; }
.stage .body p { font-size: 1.08rem; }
.kind { display: inline-block; font-size: .75rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.tipbox { background: var(--acc-soft); border-left: 6px solid var(--acc); padding: 12px 16px; border-radius: 10px; margin-top: 14px; }
.examples { margin-top: 12px; padding-top: 6px; border-top: 2px dashed var(--line); }
table.tb { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 1.02rem; }
table.tb th, table.tb td { text-align: left; padding: 10px 12px; border-bottom: 2px solid var(--line); vertical-align: top; }
table.tb th { font-size: .8rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }

.qtext { font-size: 1.2rem; font-weight: 700; margin-bottom: 14px; }
.opts { display: grid; gap: 12px; }
.opt { display: flex; align-items: center; gap: 14px; text-align: left; width: 100%; min-height: 64px; padding: 12px 18px; border-radius: 16px; border: 2px solid var(--line); background: var(--card); font-size: 1.08rem; font-weight: 600; cursor: pointer; }
.opt:hover:not(:disabled) { border-color: var(--pri); background: var(--pri-soft); }
.opt .key { flex: none; width: 34px; height: 34px; border-radius: 10px; border: 2px solid var(--line); display: grid; place-items: center; font-size: .85rem; color: var(--muted); font-weight: 800; }
.opt.sel { border-color: var(--pri); background: var(--pri-soft); }
.opt.right { border-color: var(--ok); background: var(--ok-soft); }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt:disabled { cursor: default; }
.fb { margin-top: 16px; padding: 14px 18px; border-radius: 14px; font-size: 1.02rem; }
.fb.good { background: var(--ok-soft); border: 2px solid var(--ok); }
.fb.bad { background: var(--bad-soft); border: 2px solid var(--bad); }
.fb b.h { display: block; font-size: 1.15rem; margin-bottom: 4px; }
.inp { width: 100%; min-height: 60px; padding: 12px 16px; border-radius: 14px; border: 2px solid var(--line); background: var(--card); font-size: 1.15rem; }
.inp:focus, textarea:focus { outline: 3px solid var(--pri); outline-offset: 1px; border-color: var(--pri); }
textarea.inp { min-height: 220px; line-height: 1.6; resize: vertical; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; min-height: 64px; padding: 12px; border-radius: 14px; }
.chips.answer { border: 2px dashed var(--line); background: var(--bg); margin-bottom: 14px; }
.chip { min-height: 52px; padding: 8px 18px; border-radius: 12px; border: 2px solid var(--pri); background: var(--pri-soft); font-weight: 700; font-size: 1.1rem; cursor: pointer; }
.chip:hover { background: var(--pri); color: var(--pri-ink); }
.footer { display: flex; gap: 12px; margin-top: 20px; }
.footer .btn { flex: 1; }
.footer .back { flex: 0 0 auto; }

/* flashcards */
.flash { text-align: center; padding: 40px 24px; }
.flash .front { font-size: 2.4rem; font-weight: 800; line-height: 1.2; }
.flash .back { font-size: 1.6rem; font-weight: 700; margin-top: 18px; color: var(--ok); }
.flash .nlb { text-align: left; max-width: 560px; margin: 22px auto 0; }

/* listening */
.player { text-align: center; padding: 30px 20px; }
.player .big { font-size: 1.3rem; min-height: 80px; min-width: 260px; }
.now { margin-top: 12px; min-height: 1.6em; color: var(--muted); font-weight: 700; }
.line { display: flex; gap: 12px; align-items: flex-start; margin: 10px 0; }
.line .who { flex: 0 0 auto; font-weight: 800; font-size: .8rem; color: var(--muted); width: 7.5em; padding-top: 12px; }

/* misc */
details.info { background: var(--card); border: 2px solid var(--line); border-radius: var(--r); padding: 0 20px; margin-bottom: 18px; }
details.info > summary { cursor: pointer; font-weight: 800; padding: 16px 0; font-size: 1.05rem; list-style-position: inside; }
details.info[open] { padding-bottom: 16px; }
details.info ul { margin: 0 0 12px; padding-left: 1.2em; }
details.info li { margin-bottom: 8px; }
.pic { font-size: 4.2rem; text-align: center; letter-spacing: .15em; padding: 14px; background: var(--bg); border-radius: 16px; margin: 12px 0; }
.check { display: flex; gap: 14px; align-items: flex-start; padding: 12px 0; border-bottom: 2px solid var(--line); cursor: pointer; }
.check input { width: 28px; height: 28px; flex: none; margin-top: 2px; accent-color: var(--ok); }
.mine { white-space: pre-wrap; background: var(--bg); border-radius: 12px; padding: 14px; font-size: 1.05rem; }
.field { margin-bottom: 14px; }
.field label { display: block; font-weight: 700; margin-bottom: 6px; }
.badge { display: inline-block; padding: 3px 12px; border-radius: 99px; background: var(--acc-soft); border: 2px solid var(--acc); font-weight: 800; font-size: .8rem; }
.badge.ok { background: var(--ok-soft); border-color: var(--ok); }
.hero { display: flex; flex-wrap: wrap; gap: 14px; align-items: stretch; margin-bottom: 8px; }
.stat { flex: 1; min-width: 150px; background: var(--card); border: 2px solid var(--line); border-radius: var(--r); padding: 14px 18px; }
.stat b { display: block; font-size: 1.7rem; line-height: 1.1; }
.stat span { color: var(--muted); font-size: .82rem; font-weight: 700; }
.timer { font-variant-numeric: tabular-nums; font-weight: 800; }
.rec { color: var(--bad); font-weight: 800; }
audio { width: 100%; margin-top: 12px; }
#toast { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%); background: var(--tip-bg); color: var(--tip-ink); padding: 14px 22px; border-radius: 14px; font-weight: 700; display: none; z-index: 200; max-width: 90vw; }
#overlay { position: fixed; inset: 0; background: rgba(0,0,0,.55); display: none; place-items: center; z-index: 150; padding: 16px; }
#overlay .card { max-width: 480px; text-align: center; }
.big-emoji { font-size: 4rem; line-height: 1; margin-bottom: 10px; }
.tabs { display: flex; gap: 10px; margin-bottom: 18px; flex-wrap: wrap; }
.tabs .btn { flex: 1; min-height: 54px; padding: 8px 14px; }
.tabs .btn.on { background: var(--pri); color: var(--pri-ink); border-color: var(--pri); }
.exam-banner { position: sticky; top: 62px; z-index: 10; background: var(--acc-soft); border: 2px solid var(--acc); border-radius: 14px; padding: 10px 16px; margin-bottom: 16px; display: flex; justify-content: space-between; font-weight: 800; }
@media (max-width: 520px) { html { font-size: 18px; } #bar { gap: 6px; padding: 8px; } .bar-r { gap: 6px; } .barbtn { padding: 8px 9px; font-size: .74rem; } }