:root {
  --ink: #161922;
  --paper: #f2f4f7;          /* cool neutral, slight blue bias (chosen, not warm-cream) */
  --card: #ffffff;
  --tint: #f7f9fc;           /* faint cool fill for nested surfaces */
  --line: #e4e7ee;
  --line-soft: #eef0f5;
  --accent: #2747d4;
  --accent-ink: #1b34a0;
  --accent-soft: #e9edfb;
  --good: #1f8a5b;
  --good-soft: #e9f6ef;
  --warn: #b06a1e;
  --warn-soft: #faf1e2;
  --bad: #c7405a;
  --bad-soft: #fbedf0;
  --muted: #6a7180;
  --disp: "Bricolage Grotesque", system-ui, sans-serif;
  --body: "Inter", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(22, 25, 34, .04), 0 8px 30px rgba(22, 25, 34, .06);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { text-wrap: balance; }
.band-ring .num, .crit .val, .cc-head b, .score-chip b, .errors-table td {
  font-variant-numeric: tabular-nums;
}
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }

.eyebrow {
  font-family: var(--mono); font-size: 11px; letter-spacing: .18em;
  text-transform: uppercase; color: var(--accent); font-weight: 600; margin: 0 0 3px;
}
.lbl-mono {
  display: block; font-family: var(--mono); font-size: 11px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted); font-weight: 600; margin-bottom: 6px;
}

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 16px 28px; border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .7); backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  font-family: var(--disp); font-weight: 700; font-size: 22px; color: #fff;
  width: 46px; height: 46px; display: grid; place-items: center;
  background: var(--accent); border-radius: 13px; box-shadow: var(--shadow);
}
.brand h1 { font-family: var(--disp); margin: 0; font-size: 21px; letter-spacing: -.02em; }
.brand-note { color: var(--muted); font-size: 12.5px; margin: 0; max-width: 40ch; text-align: right; }
@media (max-width: 720px) { .brand-note { display: none; } }

.page { padding: 28px 26px 64px; }
.input-wrap { max-width: 1100px; margin: 0 auto; animation: fade .25s ease; }
#resultSection { max-width: 1080px; margin: 0 auto; animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }

/* ---------- panel ---------- */
.panel {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 24px; box-shadow: var(--shadow);
}
.panel-head {
  display: flex; align-items: flex-end; justify-content: space-between; gap: 18px;
  margin-bottom: 18px; flex-wrap: wrap;
}
.panel-head h2 { font-family: var(--disp); margin: 0; font-size: 20px; letter-spacing: -.01em; }
.hint { color: var(--muted); font-size: 12.5px; }

.setup { display: flex; align-items: center; gap: 10px; }
.setup .lbl-mono { margin: 0; }

/* ---------- fields ---------- */
.field { display: block; margin-bottom: 0; }
input[type=text], textarea, select {
  width: 100%; background: #fff; border: 1px solid var(--line); color: var(--ink);
  border-radius: 11px; padding: 10px 12px; font-size: 14px; font-family: inherit;
  transition: border-color .15s, box-shadow .15s;
}
input[type=text]:focus, textarea:focus, select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
textarea { resize: vertical; }
input[type=file] { color: var(--muted); font-size: 13px; border: 0; padding: 6px 0; }

/* ---------- part card (wide & short) ---------- */
.part-card {
  background: var(--tint); border: 1px solid var(--line);
  border-radius: 13px; padding: 16px 18px; margin-bottom: 14px;
}
.part-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.part-head .part-num { flex: 1; max-width: 340px; font-weight: 600; }
.part-head .part-qid { width: 130px; flex: 0 0 auto; font-family: var(--mono); font-size: 13px; }
.part-card .field { margin-bottom: 12px; }
.remove-part {
  margin-left: auto; border: 0; background: transparent; color: #aeb4c0; font-size: 15px;
  cursor: pointer; width: 26px; height: 26px; border-radius: 7px; line-height: 1; flex: 0 0 auto;
}
.remove-part:hover { background: var(--bad-soft); color: var(--bad); }

/* audio source: control + input inline on one row */
.audio-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.audio-row .seg { flex: 0 0 auto; margin-bottom: 0; }
.audio-row .part-url { flex: 1; min-width: 240px; width: auto; }
.audio-row .part-file { flex: 1; min-width: 200px; }

/* ---------- segmented control ---------- */
.seg {
  display: inline-flex; border: 1px solid var(--line); border-radius: 9px;
  overflow: hidden; background: #fff; flex-wrap: wrap;
}
.seg-btn {
  background: transparent; color: var(--muted); border: 0; padding: 7px 13px;
  cursor: pointer; font-size: 13px; font-weight: 600; font-family: inherit;
}
.seg-btn + .seg-btn { border-left: 1px solid var(--line); }
.seg-btn:hover { color: var(--ink); }
.seg-btn.active { background: var(--accent); color: #fff; }
.audio-source .seg { margin-bottom: 8px; }

/* recording */
.part-record { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.rec-btn {
  border: 1px solid #e6b9c3; background: var(--bad-soft); color: var(--bad);
  font-weight: 600; font-size: 13px; padding: 8px 13px; border-radius: 9px; cursor: pointer;
}
.rec-btn.recording { background: var(--bad); color: #fff; animation: pulse 1.1s infinite; }
@keyframes pulse { 0%,100% { box-shadow: 0 0 0 0 rgba(199,64,90,.4); } 50% { box-shadow: 0 0 0 6px rgba(199,64,90,0); } }
.rec-status { font-size: 12.5px; }
.rec-preview { max-width: 230px; height: 32px; }

/* ---------- buttons ---------- */
.btn { border: 0; border-radius: 11px; padding: 10px 16px; font-size: 14px; cursor: pointer; font-weight: 600; font-family: inherit; transition: transform .06s, box-shadow .15s, background .15s; }
.btn.primary { background: var(--accent); color: #fff; width: 100%; box-shadow: 0 4px 16px rgba(46,79,214,.28); }
.btn.primary:hover { background: var(--accent-ink); }
.btn.primary:active { transform: translateY(1px); }
.btn.primary:disabled { opacity: .55; cursor: default; box-shadow: none; }
.btn.lg { padding: 14px; font-size: 15px; font-family: var(--disp); }
.btn.ghost { background: #fff; color: var(--accent); border: 1px dashed #c5cdec; width: 100%; }
.btn.ghost:hover { background: var(--accent-soft); border-color: var(--accent); }
.btn.back { background: #fff; color: var(--accent); border: 1px solid var(--line); box-shadow: var(--shadow); margin-bottom: 16px; }
.btn.back:hover { background: var(--accent-soft); }
.part-actions { margin: 4px 0 16px; }

.status { font-size: 13px; color: var(--muted); min-height: 18px; margin: 12px 0 0; }
.status.err { color: var(--bad); }
.hidden { display: none !important; }
.muted { color: var(--muted); }

/* ===================== RESULT ===================== */
.result-head {
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
  padding: 20px 22px; margin-bottom: 16px; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
}
.band-ring {
  width: 96px; height: 96px; border-radius: 50%; display: grid; place-items: center;
  background: conic-gradient(var(--accent) calc(var(--p) * 1%), #ece8dd 0);
}
.band-ring .inner { width: 78px; height: 78px; border-radius: 50%; background: var(--card); display: grid; place-items: center; text-align: center; box-shadow: inset 0 0 0 1px var(--line); }
.band-ring .num { font-family: var(--disp); font-size: 25px; font-weight: 700; color: var(--accent); }
.band-ring .lbl { font-family: var(--mono); font-size: 10px; color: var(--muted); }
.cefr-badge { font-family: var(--disp); font-size: 22px; font-weight: 700; padding: 8px 18px; border-radius: 12px; background: var(--accent-soft); color: var(--accent-ink); border: 1px solid #d8def4; text-align: center; }
.cefr-badge small { display: block; font-family: var(--mono); font-size: 10px; color: var(--muted); font-weight: 500; }
.hero-meta { flex: 1; min-width: 160px; }
.hero-title { font-family: var(--disp); font-size: 19px; font-weight: 600; }
.hero-comment p { margin: 0; }

/* two-pane: sticky rail + detail */
.result-layout { display: grid; grid-template-columns: 282px 1fr; gap: 18px; align-items: start; }
.rail { position: sticky; top: 86px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.rail-score { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.rail-sub { font-size: 12.5px; margin: 12px 0 0; }
.rail-bars { display: grid; gap: 11px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line-soft); }
.rail .crit { display: grid; grid-template-columns: 1fr auto; grid-template-areas: "name val" "bar bar"; gap: 3px 8px; }
.rail .crit .name { grid-area: name; font-size: 12px; }
.rail .crit .val { grid-area: val; }
.rail .crit .bar { grid-area: bar; }
.rail-nav { display: flex; flex-direction: column; gap: 2px; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line-soft); }
.rail-link { text-align: left; background: transparent; border: 0; padding: 9px 12px; border-radius: 9px; font-weight: 600; font-size: 13.5px; color: var(--muted); cursor: pointer; font-family: inherit; transition: background .15s, color .15s; }
.rail-link:hover { background: var(--tint); color: var(--ink); }
.rail-link.active { background: var(--accent-soft); color: var(--accent); }
.detail { min-width: 0; }
.pview { display: none; }
.pview.active { display: block; animation: fade .25s ease; }
@media (max-width: 860px) {
  .result-layout { grid-template-columns: 1fr; }
  .rail { position: static; }
  .rail-nav { flex-direction: row; flex-wrap: wrap; }
  .rail-link.active { background: var(--accent); color: #fff; }
}

/* cards */
.card { background: var(--card); border: 1px solid var(--line); border-radius: 13px; padding: 16px 18px; margin-bottom: 14px; box-shadow: var(--shadow); }
.card h3 { font-family: var(--disp); margin: 0 0 12px; font-size: 15.5px; }
.card h4 { font-family: var(--mono); margin: 14px 0 6px; font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.pill { display: inline-block; padding: 3px 11px; border-radius: 999px; font-size: 12px; background: var(--accent-soft); color: var(--accent-ink); border: 1px solid #dce2f6; margin: 0 6px 6px 0; font-weight: 500; }

/* criteria bars */
.criteria-grid { display: grid; gap: 11px; }
.crit { display: grid; grid-template-columns: 168px 1fr 44px; gap: 12px; align-items: center; }
.crit .name { font-size: 13px; color: var(--muted); font-weight: 500; }
.crit.weak .name { color: var(--warn); font-weight: 600; }
.crit .bar { position: relative; height: 9px; background: #e7e9f0; border-radius: 6px; }
.crit .bar > i { display: block; height: 100%; border-radius: 6px; background: var(--accent); transition: width .6s cubic-bezier(.22,.61,.36,1); }
.crit.weak .bar > i { background: var(--warn); }
.crit .bar .mark { position: absolute; top: -3px; bottom: -3px; width: 2px; background: var(--ink); border-radius: 2px; opacity: .55; transform: translateX(-1px); }
.crit .val { text-align: right; font-family: var(--mono); font-weight: 600; font-size: 14px; }
.val.t-good { color: var(--good); } .val.t-mid { color: var(--accent); } .val.t-low { color: var(--warn); } .val.t-na { color: var(--muted); }
.weak-tag { font-family: var(--mono); font-size: 9.5px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; background: var(--warn-soft); color: var(--warn); border-radius: 5px; padding: 1px 6px; margin-left: 7px; }

/* criteria comment cards */
.cc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; }
@media (max-width: 620px) { .cc-grid { grid-template-columns: 1fr; } }
.cc-card { border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 11px; padding: 12px 14px; background: var(--tint); }
.cc-card.t-good { border-left-color: var(--good); }
.cc-card.t-mid { border-left-color: var(--accent); }
.cc-card.t-low { border-left-color: var(--warn); }
.cc-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 4px; }
.cc-head span { font-weight: 600; font-size: 13px; }
.cc-head b { font-family: var(--mono); font-size: 15px; }
.cc-card p { margin: 0; font-size: 13px; color: #444a57; }
.cc-good, .cc-improve { display: flex; gap: 7px; align-items: flex-start; margin-top: 7px !important; line-height: 1.45; }
.ic { flex: 0 0 auto; font-weight: 700; font-size: 12px; width: 16px; height: 16px; border-radius: 5px; display: grid; place-items: center; margin-top: 1px; }
.ic.ok { color: var(--good); background: var(--good-soft); }
.ic.up { color: var(--warn); background: var(--warn-soft); }

/* band-gap callout */
.bandgap { border-left: 4px solid var(--accent); background: var(--accent-soft); }
.gap-line { margin: 0; font-size: 14.5px; }
.gap-line b { color: var(--accent-ink); }
.gap-note { margin: 8px 0 0; font-size: 13.5px; color: #3c4660; }

/* focus + action */
.fp-note { background: var(--warn-soft); border: 1px solid #ecd6b2; color: #835011; border-radius: 11px; padding: 11px 13px; font-size: 13px; margin-bottom: 12px; }
.focus { display: flex; gap: 11px; padding: 11px 0; border-bottom: 1px solid var(--line-soft); }
.focus:last-child { border-bottom: 0; }
.focus-dot { font-size: 16px; }
.focus .cmd { font-weight: 600; }
.focus .why { color: var(--muted); font-size: 13px; display: block; margin-top: 3px; }
ol.actions { margin: 6px 0 0; padding-left: 20px; }
ol.actions li { margin: 6px 0; }

/* focus-point anchors: a real strong sentence + a rewrite of a weak one */
.anchor { margin: 8px 0 0; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--line); font-size: 13.5px; }
.anchor.good { background: var(--good-soft); border-color: #cdebda; }
.anchor.rw { background: var(--accent-soft); border-color: #d6e0fb; }
.anchor p { margin: 4px 0 0; }
.anchor-lbl { font-family: var(--mono); font-size: 11px; font-weight: 600; letter-spacing: .05em; text-transform: uppercase; color: var(--muted); }
.anchor.good .anchor-lbl { color: var(--good); }
.anchor.rw .anchor-lbl { color: var(--accent); }

/* part view */
.prompt { margin: 0 0 6px; color: #444a57; font-size: 13.5px; }
.transcript { margin: 0; padding: 11px 13px; background: var(--tint); border-radius: 10px; border: 1px solid var(--line); font-size: 14px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 14px; }
@media (max-width: 700px) { .two-col { grid-template-columns: 1fr; } }
.comment-good, .comment-bad { border: 1px solid var(--line); border-left: 3px solid var(--good); background: var(--good-soft); border-radius: 0 11px 11px 0; padding: 11px 13px; }
.comment-bad { border-left-color: var(--warn); background: var(--warn-soft); }
.cmt-lbl { font-family: var(--mono); font-size: 11px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--good); }
.comment-bad .cmt-lbl { color: var(--warn); }
.comment-good p, .comment-bad p { margin: 5px 0 0; font-size: 13.5px; }

/* sub-tabs */
.card.pad0 { padding: 0; overflow: hidden; }
.subtabs { display: flex; gap: 2px; padding: 6px 8px 0; border-bottom: 1px solid var(--line); overflow-x: auto; }
.subtab { flex: 0 0 auto; border: 0; background: transparent; color: var(--muted); font-weight: 600; font-size: 13px; padding: 11px 14px; border-radius: 9px 9px 0 0; cursor: pointer; white-space: nowrap; border-bottom: 2px solid transparent; margin-bottom: -1px; display: inline-flex; align-items: center; gap: 6px; font-family: inherit; }
.subtab:hover { color: var(--ink); }
.subtab.active { color: var(--accent); border-bottom-color: var(--accent); }
.subtab .count { font-family: var(--mono); font-size: 11px; font-weight: 600; background: var(--bad-soft); color: var(--bad); border-radius: 999px; padding: 1px 7px; }
.subtab.active .count { background: var(--accent-soft); color: var(--accent); }
.subview { display: none; padding: 16px 18px; }
.subview.active { display: block; animation: fade .2s ease; }

.chips-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.score-chip { font-size: 13px; background: var(--tint); border: 1px solid var(--line); border-radius: 999px; padding: 5px 13px; }
.score-chip b { font-family: var(--mono); color: var(--accent); }
.legend { margin-top: 10px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.none { color: var(--muted); text-align: center; padding: 24px 10px; background: var(--tint); border: 1px solid var(--line); border-radius: 10px; }
.upgrade-text { padding: 12px 14px; background: var(--good-soft); border: 1px solid #cdebda; border-radius: 10px; margin: 0 0 6px; line-height: 1.7; }
.upgrade-text mark { background: #b6f0cf; color: inherit; padding: 1px 3px; border-radius: 4px; }

/* errors table */
.errors-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.errors-table th, .errors-table td { text-align: left; padding: 8px 8px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.errors-table th { font-family: var(--mono); font-size: 11px; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.strike { text-decoration: line-through; color: var(--bad); }
.fix { color: var(--good); font-weight: 600; }

/* pronunciation annotation */
.annot { line-height: 2.3; font-size: 15px; }
.w { padding: 2px 5px; border-radius: 6px; cursor: default; }
.w.correct { background: rgba(31,138,91,.15); }
.w.warning { background: rgba(176,106,30,.20); }
.w.error { background: rgba(199,64,90,.18); }

/* loading + error */
.loading { text-align: center; padding: 76px 20px; }
.loading p { font-family: var(--disp); margin: 18px 0 4px; font-weight: 600; font-size: 16px; }
.spinner { width: 44px; height: 44px; margin: 0 auto; border: 4px solid #e7e2d6; border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.error-card { background: var(--card); border: 1px solid #eccdd4; border-left: 4px solid var(--bad); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.error-card h3 { font-family: var(--disp); margin: 0 0 8px; }
.error-card .btn { width: auto; margin-top: 12px; }

audio { width: 100%; margin-top: 8px; }
.answer-audio { margin: 6px 0 14px; height: 38px; }

/* schema (JSON) tree — collapsible request/response */
.jsontree { font-family: var(--mono); font-size: 12.5px; line-height: 1.75; overflow-x: auto; }
.jt-node { margin: 0; }
.jt-node > summary { cursor: pointer; list-style: none; border-radius: 5px; padding: 0 3px; }
.jt-node > summary:hover { background: var(--accent-soft); }
.jt-node > summary::-webkit-details-marker { display: none; }
.jt-node > summary::before { content: "▸"; display: inline-block; width: 1em; color: var(--muted); transition: transform .12s ease; }
.jt-node[open] > summary::before { transform: rotate(90deg); }
.jt-children { padding-left: 15px; margin-left: 6px; border-left: 1px solid var(--line-soft); }
.jt-leaf { padding-left: 1em; white-space: pre-wrap; word-break: break-word; }
.jt-key { color: var(--accent-ink); }
.jt-str { color: var(--good); }
.jt-num { color: #b5561e; }
.jt-bool { color: #8250df; }
.jt-null, .jt-muted { color: var(--muted); }
.jt-audio { color: var(--accent); font-style: italic; }