:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --text: #1c1c1a;
  --muted: #6b6b66;
  --border: #e4e4df;
  --border-strong: #cfcfc8;
  --accent: #1f5eff;
  --accent-soft: #eaf0ff;
  --ok: #1a7f37;
  --ok-soft: #e9f6ec;
  --ok-line: #b7e1c1;
  --warn: #8a5a00;
  --warn-soft: #fff5e0;
  --warn-line: #f0d49a;
  --bad: #b42318;
  --bad-soft: #fdeeec;
  --bad-line: #f4c2bc;
  --radius: 10px;
  --deva: "Noto Sans Devanagari", "Nirmala UI", "Mangal", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}
[hidden] { display: none !important; }
.deva { font-family: var(--deva); }
.muted { color: var(--muted); margin: 0 0 .75rem; }

/* top bar */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .9rem 1.5rem; background: var(--surface); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; align-items: baseline; gap: .75rem; flex-wrap: wrap; }
.brand-name { font-weight: 700; font-size: 1.15rem; letter-spacing: -.01em; }
.brand-sub { color: var(--muted); font-size: .9rem; }

.topbar { flex-wrap: wrap; }
.segmented { display: inline-flex; flex-shrink: 0; border: 1px solid var(--border-strong); border-radius: 8px; overflow: hidden; }
.segmented button {
  border: 0; background: var(--surface); padding: .4rem .9rem; font: inherit; font-size: .9rem;
  color: var(--muted); cursor: pointer;
}
.segmented button + button { border-left: 1px solid var(--border-strong); }
.segmented button.active { background: var(--text); color: #fff; }

/* layout */
.layout {
  display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 1.5rem;
  max-width: 1180px; margin: 0 auto; padding: 1.5rem;
}
.panel, .card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.settings { padding: 1.1rem; align-self: start; position: sticky; top: 4.5rem; }
.panel-title { font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 0 0 .9rem; font-weight: 600; }
.card { padding: 1.25rem 1.4rem; margin-bottom: 1rem; }

.field { display: flex; flex-direction: column; gap: .3rem; margin-bottom: 1rem; }
.field-label { font-size: .85rem; font-weight: 500; }
.field-note { font-size: .8rem; color: var(--muted); }
.row { display: flex; gap: 1rem; flex-wrap: wrap; }
.row .grow { flex: 1 1 260px; }
.row .narrow { flex: 0 0 160px; }
.row .field { margin-bottom: 0; }

input[type=text], input[type=number], select, textarea {
  font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border-strong); border-radius: 8px; padding: .5rem .65rem; width: 100%;
}
input:focus, select:focus, textarea:focus, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
input[type=range] { width: 100%; accent-color: var(--accent); }

.btn {
  font: inherit; font-weight: 500; border-radius: 8px; padding: .55rem 1rem; cursor: pointer;
  border: 1px solid transparent; display: inline-flex; align-items: center; gap: .5rem; justify-content: center;
}
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: #174ad4; }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn-secondary:hover:not(:disabled) { background: #f1f1ee; }
.btn-record { background: var(--surface); color: var(--text); border-color: var(--border-strong); min-width: 150px; }
.btn-record.recording { background: var(--bad-soft); border-color: var(--bad-line); color: var(--bad); }
.btn-block { width: 100%; }
.link-btn { border: 0; background: none; color: var(--accent); font: inherit; font-size: .9rem; cursor: pointer; padding: 0; }
.fine-print { font-size: .78rem; color: var(--muted); margin: .9rem 0 0; }

.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--bad); display: inline-block; }
.recording .dot { animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .3; } }

/* tabs */
.tabs { display: flex; gap: 1.5rem; border-bottom: 1px solid var(--border); margin-bottom: 1.25rem; }
.tab {
  border: 0; background: none; font: inherit; font-weight: 500; color: var(--muted); cursor: pointer;
  padding: .5rem 0; border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tab.active { color: var(--text); border-bottom-color: var(--text); }

/* stepper */
.stepper { list-style: none; display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; margin: 0 0 1rem; }
.stepper li {
  font-size: .85rem; padding: .3rem .8rem; border-radius: 999px; border: 1px solid var(--border-strong);
  background: var(--surface); color: var(--muted);
}
.stepper li.now { border-color: var(--accent); color: var(--accent); font-weight: 600; background: var(--accent-soft); }
.stepper li.pass { border-color: var(--ok-line); color: var(--ok); background: var(--ok-soft); }
.stepper li.fail { border-color: var(--bad-line); color: var(--bad); background: var(--bad-soft); }

/* task */
.task-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; }
.task-title { font-size: 1.35rem; margin: 0; letter-spacing: -.01em; }
.task-instruction { margin: .2rem 0 1rem; color: var(--muted); }
.reading-text {
  font-family: var(--deva); font-size: 1.85rem; line-height: 1.75; padding: 1.1rem 1.3rem;
  background: #fbfbf9; border: 1px solid var(--border); border-radius: 8px;
}
.text-editor { font-family: var(--deva); font-size: 1.1rem; min-height: 120px; }
.task-rule { font-size: .85rem; color: var(--muted); margin: .75rem 0 0; }

.input-row { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; }
.input-or { color: var(--muted); font-size: .85rem; }
.timer { font-variant-numeric: tabular-nums; color: var(--muted); font-size: .9rem; min-width: 3rem; }
.playback { margin-top: .9rem; width: 100%; max-width: 420px; display: block; }
.upload-label { cursor: pointer; }
.upload-label input { display: none; }
.actions { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: 1rem; }
.status { font-size: .88rem; color: var(--muted); }
.error { color: var(--bad); background: var(--bad-soft); border: 1px solid var(--bad-line); border-radius: 8px; padding: .6rem .8rem; margin-top: .8rem; font-size: .9rem; }

/* result */
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .75rem; margin-bottom: 1rem; }
.stat { border: 1px solid var(--border); border-radius: 8px; padding: .7rem .9rem; }
.stat-label { font-size: .78rem; color: var(--muted); }
.stat-value { font-size: 1.35rem; font-weight: 600; }
.stat-value.pass { color: var(--ok); }
.stat-value.fail { color: var(--bad); }
.reasons { font-size: .88rem; color: var(--muted); margin: 0 0 .8rem; }
.heard { margin: 0 0 1rem; }
.heard b { font-weight: 600; }
.heard span { font-family: var(--deva); }

.legend { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .8rem; }
.legend .chip { font-family: inherit; font-size: .78rem; padding: .15rem .55rem; }
.words { display: flex; flex-wrap: wrap; gap: .4rem; }
.chip {
  font-family: var(--deva); font-size: 1.2rem; line-height: 1.5; border-radius: 8px; padding: .25rem .6rem;
  border: 1px solid var(--border); text-align: center; background: var(--surface);
}
.chip small { display: block; font-family: "Inter", sans-serif; font-size: .7rem; line-height: 1.3; color: var(--muted); }
.chip.ok { background: var(--ok-soft); border-color: var(--ok-line); }
.chip.forgiven { background: var(--warn-soft); border-color: var(--warn-line); }
.chip.forgiven small { color: var(--warn); }
.chip.bad { background: var(--bad-soft); border-color: var(--bad-line); }
.chip.bad small { color: var(--bad); }
.chip.extra { border-style: dashed; color: var(--muted); }
.chip .struck { text-decoration: line-through; }

details { border-top: 1px solid var(--border); margin-top: 1rem; padding-top: .8rem; }
summary { cursor: pointer; font-weight: 500; font-size: .92rem; }
details .inner { padding-top: .75rem; font-size: .9rem; }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-weight: 600; color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; }
td.deva { font-size: 1rem; }
.warning { background: var(--warn-soft); border: 1px solid var(--warn-line); color: var(--warn); border-radius: 8px; padding: .6rem .8rem; margin: .8rem 0; font-size: .9rem; }
.saved { color: var(--ok); font-size: .88rem; }

/* final */
.level-eyebrow { color: var(--muted); margin: 0; font-size: .9rem; }
.level-name { font-size: 2.6rem; font-weight: 700; letter-spacing: -.02em; margin: .1rem 0 .8rem; }
.callout { background: var(--accent-soft); border-radius: 8px; padding: .75rem 1rem; margin-bottom: 1rem; }
.path { margin: 0 0 1rem; padding-left: 1.1rem; }
.section-title { font-size: .95rem; font-weight: 600; margin: 1.2rem 0 .6rem; }
.bars { display: grid; grid-template-columns: max-content 1fr max-content; gap: .4rem .75rem; align-items: center; font-size: .88rem; }
.bar { height: 10px; background: var(--bad-line); border-radius: 5px; }

@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); padding: 1rem; gap: 1rem; }
  .settings { position: static; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .reading-text { font-size: 1.5rem; }
  .topbar { padding: .8rem 1rem; }
}

/* GOP */
.gop-box { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: .9rem 0 .1rem; margin-bottom: 1rem; }
.check { display: flex; gap: .6rem; align-items: flex-start; margin-bottom: .9rem; cursor: pointer; font-size: .9rem; }
.check input { margin-top: .25rem; accent-color: var(--accent); }
.chip.lowgop { box-shadow: inset 0 -3px 0 var(--warn); }
.gop-line { font-size: .85rem; color: var(--muted); margin: .6rem 0 0; }
.notes { font-size: .88rem; color: var(--warn); background: var(--warn-soft); border: 1px solid var(--warn-line); border-radius: 8px; padding: .5rem .8rem; margin: 0 0 .8rem; }

/* pipeline */
.pipeline { margin: 0; padding-left: 1.3rem; font-size: .9rem; }
.pipeline li { padding: .45rem 0; border-bottom: 1px solid var(--border); }
.pipeline li:last-child { border-bottom: 0; }
.stage { font-weight: 600; }
.stage-body { color: var(--text); margin-top: .15rem; }
.rule-row { margin: .15rem 0; }
.rule-id { display: inline-block; font-size: .75rem; font-weight: 600; background: var(--accent-soft); color: var(--accent); border-radius: 5px; padding: 0 .4rem; margin-right: .35rem; }
.arrow { color: var(--muted); font-size: .8rem; }
.rule-result { color: var(--muted); margin-top: .15rem; }
.muted-inline { color: var(--muted); }

/* per-phoneme view */
.units { display: flex; flex-wrap: wrap; gap: .3rem; }
.unit { border: 1px solid var(--ok-line); background: var(--ok-soft); border-radius: 6px; padding: .15rem .45rem; text-align: center; font-size: .82rem; }
.unit b { font-weight: 600; font-family: "Inter", "Segoe UI", sans-serif; }
.unit small { display: block; color: var(--muted); font-size: .68rem; line-height: 1.25; }
.unit.low { border-color: var(--bad-line); background: var(--bad-soft); }
.unit.low small { color: var(--bad); }

/* students */
.card-title { font-size: 1.05rem; margin: 0 0 .8rem; }
tr.clickable { cursor: pointer; }
tr.clickable:hover td { background: #fafaf7; }
.pill { display: inline-block; font-size: 1rem; border: 1px solid var(--bad-line); background: var(--bad-soft); border-radius: 6px; padding: 0 .45rem; }
td.big { font-size: 1.5rem; }
.rate { display: inline-block; width: 70px; height: 8px; background: var(--border); border-radius: 4px; margin-right: .4rem; vertical-align: middle; overflow: hidden; }
.rate div { height: 100%; background: var(--bad); }
.dot-ok, .dot-bad { display: inline-block; width: 11px; height: 11px; border-radius: 50%; margin-right: 3px; vertical-align: middle; }
.dot-ok { background: var(--ok); }
.dot-bad { background: var(--bad); }
.improving { font-size: .78rem; color: var(--ok); }
.add-student { border: 0; margin: 0 0 1rem; padding: 0; }
.add-student summary { font-size: .88rem; color: var(--accent); }
.level-chart { width: 100%; max-width: 560px; height: auto; }
.level-chart .grid { stroke: var(--border); }
.level-chart .axis { fill: var(--muted); font-size: 11px; font-family: "Inter", sans-serif; }
.level-chart .line { fill: none; stroke: var(--accent); stroke-width: 2; }
.level-chart .dot { fill: var(--accent); }

.demo-banner { background: var(--accent-soft); color: #1d3f9e; border-bottom: 1px solid #cbd8ff; padding: .6rem 1.5rem; font-size: .88rem; }
.startup-error { margin: 0 0 1rem; }

/* in-browser engine status (online demo) */
.engine-status { position: fixed; left: 50%; bottom: 1rem; transform: translateX(-50%); z-index: 20; width: min(560px, calc(100% - 2rem));
  background: var(--surface); border: 1px solid var(--border-strong); border-radius: 10px; padding: .65rem .9rem;
  box-shadow: 0 6px 24px rgba(0,0,0,.08); font-size: .88rem; }
.engine-progress { height: 6px; background: var(--border); border-radius: 3px; margin-top: .45rem; overflow: hidden; }
.engine-progress div { height: 100%; width: 0; background: var(--accent); transition: width .2s; }