:root {
  color-scheme: light;
  --ground: #EDF0EB;
  --surface: #FFFFFF;
  --surface-2: #E2E8E2;
  --ink: #17201C;
  --muted: #56635C;
  --line: #CAD4CC;
  --accent: #1F6B5C;
  --accent-ink: #FFFFFF;
  --accent-soft: #D5E8E1;
  --gold: #C98A1B;
  --t1: #C8352E; --t2: #B86A0A; --t3: #1F8352; --t4: #2A5FC4; --t5: #7A847F;
  --good: #1F8352; --fix: #B86A0A; --err: #B3372F;
  --hz: "Noto Serif SC", "Noto Serif CJK SC", "Songti SC", "SimSun", serif;
  --ui: "Instrument Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --ground: #101614; --surface: #18201D; --surface-2: #222C28; --ink: #E5ECE8; --muted: #9AA7A0; --line: #2E3A35;
    --accent: #5FC0A6; --accent-ink: #0C1512; --accent-soft: #1D3530; --gold: #F0B056;
    --t1: #FF7D72; --t2: #F0B056; --t3: #5ED296; --t4: #7EA9FF; --t5: #8E9993;
    --good: #5ED296; --fix: #F0B056; --err: #FF7D72;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 15px/1.5 var(--ui);
  -webkit-tap-highlight-color: transparent;
}
[hidden] { display: none !important; }
a { color: var(--accent); }
h1, h2, h3 { text-wrap: balance; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.row.end { justify-content: flex-end; }

.view {
  max-width: 640px;
  margin: 0 auto;
  padding-inline: 16px;
  padding-top: calc(14px + env(safe-area-inset-top, 0px));
  padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ---------- buttons ---------- */
.btn {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 12px;
  padding: 10px 16px;
  font-weight: 600;
  cursor: pointer;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.ghost { background: transparent; }
.btn.big { padding: 14px 22px; font-size: 16px; border-radius: 14px; }
.btn.small { padding: 6px 12px; font-size: 13px; border-radius: 999px; }
.btn:disabled { opacity: .5; }
.icon-btn {
  width: 42px; height: 42px; border-radius: 12px; border: 0; background: var(--surface-2);
  display: grid; place-items: center; cursor: pointer; color: var(--ink);
}
.icon-btn svg { width: 22px; height: 22px; fill: currentColor; }

/* ---------- home ---------- */
.top { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.brand { display: flex; align-items: center; gap: 12px; }
.seal {
  font-family: var(--hz); font-weight: 600; font-size: 20px; letter-spacing: -1px;
  background: var(--accent); color: var(--accent-ink);
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
}
.brand h1 { margin: 0; font-size: 20px; line-height: 1.2; }
.brand p { margin: 0; color: var(--muted); font-size: 13px; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 16px; }
.card h2 { margin: 0; font-size: 20px; }
.eyebrow, .section-head h3, .label {
  font-size: 11px; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; color: var(--muted); margin: 0;
}
.setup ol { padding-left: 20px; margin: 8px 0 12px; }
.setup p { margin: 6px 0 0; }
.inline-form { display: flex; gap: 8px; flex-wrap: wrap; }
.inline-form input { flex: 1 1 200px; min-width: 0; }
input[type="password"], input[type="text"], .type-form input, .inline-form input, select {
  font: 16px var(--ui); color: var(--ink); background: var(--surface); border: 1px solid var(--line);
  border-radius: 12px; padding: 10px 12px;
}
select { padding: 8px 10px; font-size: 14px; }

.streak { display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap; }
.streak-main { display: flex; align-items: center; gap: 12px; }
.streak-num {
  font-size: 40px; font-weight: 700; line-height: 1; color: var(--gold);
  font-variant-numeric: tabular-nums; min-width: 1.2ch;
}
.streak-label { font-weight: 600; }
.week { display: flex; gap: 6px; }
.day {
  width: 30px; height: 38px; border-radius: 9px; background: var(--surface-2);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-size: 11px; color: var(--muted); gap: 1px;
}
.day b { font-family: var(--hz); font-weight: 600; font-size: 13px; color: var(--ink); }
.day.done { background: var(--accent); color: var(--accent-ink); }
.day.done b { color: var(--accent-ink); }
.day.today { outline: 2px solid var(--accent); outline-offset: 1px; }

.today { display: flex; flex-direction: column; gap: 8px; background: var(--accent-soft); border-color: transparent; }
.today-zh { font-family: var(--hz); font-size: 34px; line-height: 1.2; font-weight: 600; }
.today p { margin: 0; }

.section-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 10px; }
.topics { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
.topic {
  text-align: left; border: 1px solid var(--line); background: var(--surface); border-radius: 14px;
  padding: 10px 12px; cursor: pointer; display: flex; flex-direction: column; gap: 2px;
}
.topic .zh { font-family: var(--hz); font-size: 18px; }
.topic .en { font-size: 13px; color: var(--muted); }
.history { display: flex; flex-direction: column; gap: 8px; }
.hist {
  display: flex; justify-content: space-between; gap: 10px; align-items: center;
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 10px 12px;
  text-align: left; cursor: pointer; width: 100%;
}
.hist .zh { font-family: var(--hz); }
.stars { color: var(--gold); letter-spacing: 1px; white-space: nowrap; }

/* ---------- talk ---------- */
#talk { min-height: 100%; padding-bottom: 0; gap: 10px; }
.talk-top { display: grid; grid-template-columns: 42px 1fr auto; align-items: center; gap: 10px; }
.talk-title { text-align: center; min-width: 0; }
.talk-zh { font-family: var(--hz); font-size: 18px; font-weight: 600; line-height: 1.2; }
.talk-en { font-size: 12px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.talk-toggles { display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; }
.pill-toggle { cursor: pointer; }
.pill-toggle input { position: absolute; opacity: 0; pointer-events: none; }
.pill-toggle span {
  display: inline-block; font-size: 12px; font-weight: 600; padding: 5px 11px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--muted); background: var(--surface);
}
.pill-toggle input:checked + span { background: var(--ink); color: var(--ground); border-color: var(--ink); }
.pill-toggle input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

.chat { flex: 1; display: flex; flex-direction: column; gap: 14px; padding-block: 6px 12px; }
.hide-py .py.opt { display: none; }
.hide-en .en.opt { display: none; }
.msg { max-width: 94%; }
.msg.tutor { align-self: flex-start; }
.msg.me { align-self: flex-end; text-align: right; }
.who { font-size: 11px; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; color: var(--muted); margin-bottom: 4px; }
.bubble { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 12px 14px; }
.tutor .bubble { border-top-left-radius: 6px; }
.me .bubble {
  display: inline-block; text-align: left; background: var(--accent); border-color: var(--accent);
  color: var(--accent-ink); border-top-right-radius: 6px; font-family: var(--hz); font-size: 18px;
}
.via { font-size: 11px; color: var(--muted); margin-top: 3px; }

.line { display: flex; flex-direction: column; gap: 1px; }
.py { font-size: 14px; word-spacing: .12em; }
.hz { font-family: var(--hz); font-size: 24px; line-height: 1.45; }
.en { font-size: 13px; color: var(--muted); }
.t1 { color: var(--t1); } .t2 { color: var(--t2); } .t3 { color: var(--t3); } .t4 { color: var(--t4); } .t5 { color: var(--t5); }

.audio { display: flex; gap: 6px; margin-top: 8px; flex-wrap: wrap; }
.play {
  border: 1px solid var(--line); background: var(--surface-2); font-size: 12px; font-weight: 600;
  padding: 5px 11px; border-radius: 999px; cursor: pointer; display: inline-flex; gap: 5px; align-items: center;
}
.play svg { width: 11px; height: 11px; fill: currentColor; }

.goal { background: var(--accent-soft); border-radius: 14px; padding: 12px 14px; display: flex; flex-direction: column; gap: 8px; }
.goal p { margin: 0; }
.phrases { display: flex; flex-direction: column; gap: 6px; }

.fb {
  margin-top: 6px; text-align: left; background: var(--surface); border: 1px solid var(--line);
  border-left-width: 4px; border-radius: 12px; padding: 10px 12px; display: flex; flex-direction: column; gap: 6px;
}
.fb.great { border-left-color: var(--good); }
.fb.fix { border-left-color: var(--fix); }
.fb.try { border-left-color: var(--t4); }
.fb .tag { font-size: 11px; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; }
.fb.great .tag { color: var(--good); } .fb.fix .tag { color: var(--fix); } .fb.try .tag { color: var(--t4); }
.fb .hz { font-size: 20px; }
.fb .note { font-size: 13px; }
.fb .pron { font-size: 13px; color: var(--muted); }
.fb .pron b { color: var(--ink); }

.sugg { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; }
.sbtn {
  text-align: left; border: 1px dashed var(--line); background: transparent; border-radius: 12px;
  padding: 7px 10px; cursor: pointer;
}
.sbtn .hz { font-size: 17px; }
.sbtn .py, .sbtn .en { font-size: 12px; }

.thinking { color: var(--muted); font-style: italic; }
.done-card { text-align: center; background: var(--accent-soft); border-radius: 14px; padding: 12px; display: flex; flex-direction: column; gap: 8px; align-items: center; }

.dock {
  position: sticky; bottom: 0; background: var(--ground);
  margin-inline: -16px; padding-inline: 16px;
  padding-top: 8px; padding-bottom: calc(14px + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 10px;
}
.status { text-align: center; font-size: 14px; color: var(--muted); min-height: 1.5em; }
.status.live { color: var(--ink); font-family: var(--hz); font-size: 18px; }
.status.err { color: var(--err); }
.type-form { display: flex; gap: 8px; }
.type-form input { flex: 1; min-width: 0; }
.controls { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; }
.side-btn {
  justify-self: center; border: 0; background: none; cursor: pointer; display: flex; flex-direction: column;
  align-items: center; gap: 3px; font-size: 12px; font-weight: 600; color: var(--muted); padding: 6px;
}
.side-btn svg { width: 26px; height: 26px; }
.en-badge {
  font-size: 12px; font-weight: 700; border: 1.8px solid currentColor; border-radius: 7px; padding: 2px 5px; line-height: 1.2;
}
.side-btn.on { color: var(--accent); }
.mic {
  width: 78px; height: 78px; border-radius: 50%; border: 0; cursor: pointer;
  background: var(--accent); color: var(--accent-ink);
  display: grid; place-items: center; position: relative;
  box-shadow: 0 6px 18px rgba(31, 107, 92, .35);
}
.mic svg { width: 34px; height: 34px; fill: currentColor; }
.mic:disabled { opacity: .45; box-shadow: none; }
.mic.listening { background: var(--err); box-shadow: 0 6px 18px rgba(179, 55, 47, .35); }
.mic.listening::after {
  content: ""; position: absolute; inset: -8px; border-radius: 50%; border: 3px solid var(--err); opacity: .5;
}
.mic.speaking::after {
  content: ""; position: absolute; inset: -8px; border-radius: 50%; border: 3px solid var(--accent); opacity: .5;
}
@media (prefers-reduced-motion: no-preference) {
  .mic.listening::after, .mic.speaking::after { animation: pulse 1.2s ease-out infinite; }
  .msg { animation: rise .25s ease-out; }
}
@keyframes pulse { from { transform: scale(.92); opacity: .7; } to { transform: scale(1.18); opacity: 0; } }
@keyframes rise { from { transform: translateY(6px); opacity: .4; } to { transform: none; opacity: 1; } }

/* ---------- avatar (Lìlì) ---------- */
:root {
  --av-bg: #CFE5DC; --av-hair: #2B211E; --av-skin: #F6DCC7; --av-skin-2: #E3B89B; --av-cheek: #F2A7A0;
  --av-ink: #2B211E; --av-mouth: #B8474A; --av-top: #1F6B5C; --av-shirt: #FFFFFF;
}
@media (prefers-color-scheme: dark) {
  :root { --av-bg: #1D3530; --av-top: #3E9E86; }
}
.lili { display: block; border: 0; padding: 0; background: none; flex: none; width: 116px; aspect-ratio: 1; max-width: 100%; }
.lili.big { width: 170px; cursor: pointer; }
.lili svg { width: 100%; height: 100%; display: block; }
.lili .halo { fill: none; stroke: var(--line); stroke-width: 4; transform-origin: 100px 100px; }
.lili .mouth { opacity: 0; transform-origin: 100px 124px; }
.lili .eyes { transform-origin: 100px 99px; }
.lili .head { transform-origin: 100px 150px; }
.lili[data-state="listening"] .halo { stroke: var(--err); }
.lili[data-state="thinking"] .halo { stroke: var(--gold); stroke-dasharray: 14 10; }
.lili[data-state="speaking"] .halo { stroke: var(--accent); }
.lili[data-state="speaking"] .smile { opacity: 0; }
.lili[data-state="speaking"] .mouth { opacity: 1; }
.lili[data-state="listening"] .brows { transform: translateY(-3px); }
.lili[data-state="thinking"] .eyes { transform: translate(3px, -3px); }
@media (prefers-reduced-motion: no-preference) {
  .lili .eyes { animation: blink 4.5s infinite; }
  .lili[data-state="thinking"] .eyes { animation: none; }
  .lili[data-state="speaking"] .mouth { animation: talk .2s ease-in-out infinite alternate; }
  .lili[data-state="speaking"] .head { animation: sway 1.8s ease-in-out infinite; }
  .lili[data-state="thinking"] .halo { animation: spin 2.4s linear infinite; }
  .lili[data-state="listening"] .head { animation: nod 1.6s ease-in-out infinite; }
  .lili[data-state="idle"] .head { animation: breathe 4s ease-in-out infinite; }
  .lili .brows, .lili .eyes { transition: transform .25s; }
}
@keyframes blink { 0%, 94%, 100% { transform: scaleY(1); } 97% { transform: scaleY(.1); } }
@keyframes talk { from { transform: scaleY(.3); } to { transform: scaleY(1.2); } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes nod { 50% { transform: translateY(3px) rotate(-1.5deg); } }
@keyframes sway { 25% { transform: rotate(1.5deg); } 75% { transform: rotate(-1.5deg); } }
@keyframes breathe { 50% { transform: translateY(1.5px); } }

/* home hero */
.hero { display: flex; align-items: center; gap: 14px; }
.hero-bubble {
  position: relative; flex: 1; min-width: 0; background: var(--surface); border: 1px solid var(--line);
  border-radius: 18px; padding: 12px 14px; display: flex; flex-direction: column; gap: 2px;
}
.hero-bubble::before {
  content: ""; position: absolute; left: -8px; top: 50%; width: 14px; height: 14px; margin-top: -7px;
  background: var(--surface); border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); transform: rotate(45deg);
}
.hero-bubble .hz { font-size: 22px; }
@media (max-width: 380px) { .lili.big { width: 130px; } }

/* talk stage */
.stage {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 2;
  display: flex; align-items: center; gap: 12px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 22px; padding: 10px 12px;
}
.stage-text { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.tutor-name { font-weight: 700; font-size: 16px; }
.tutor-name span { font-family: var(--hz); font-weight: 600; color: var(--muted); margin-left: 2px; }
.tutor-state { font-style: normal; font-weight: 500; font-size: 12px; color: var(--muted); margin-left: 6px; }
.stage:has(.lili[data-state="listening"]) .tutor-state { color: var(--err); font-weight: 700; }
.caption { font-size: 14px; line-height: 1.4; max-height: 5.6em; overflow-y: auto; }
.caption .hz { font-size: 20px; line-height: 1.35; }
.caption .en { font-size: 13px; }

.help {
  background: var(--accent-soft); border-radius: 12px; padding: 9px 11px; margin-bottom: 10px;
  font-size: 14px; display: flex; flex-direction: column; gap: 4px;
}
.help .label { color: var(--accent); }

.cats { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }
.cat {
  border: 1px solid var(--line); background: var(--surface); border-radius: 999px; padding: 6px 12px;
  font-size: 13px; font-weight: 600; cursor: pointer; display: inline-flex; gap: 6px; align-items: baseline;
}
.cat .zh { font-family: var(--hz); font-weight: 400; color: var(--muted); }
.cat[aria-selected="true"] { background: var(--ink); color: var(--ground); border-color: var(--ink); }
.cat[aria-selected="true"] .zh { color: var(--ground); opacity: .75; }
.topic .tag { font-size: 10px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.today .tag { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }

/* ---------- summary ---------- */
.summary-body { display: flex; flex-direction: column; gap: 14px; }
.score { text-align: center; display: flex; flex-direction: column; gap: 4px; align-items: center; }
.score .stars { font-size: 32px; }
.fix-item { border-top: 1px solid var(--line); padding-top: 10px; display: flex; flex-direction: column; gap: 4px; }
.fix-item:first-of-type { border-top: 0; padding-top: 0; }
.said { font-family: var(--hz); text-decoration: line-through; color: var(--muted); }
.words { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
.word { background: var(--surface-2); border: 0; border-radius: 12px; padding: 8px 10px; text-align: left; cursor: pointer; }
.word .hz { font-size: 20px; }
.word .py, .word .en { font-size: 12px; }

/* ---------- settings ---------- */
dialog {
  border: 0; border-radius: 20px; padding: 0; width: min(520px, calc(100% - 24px));
  background: var(--surface); color: var(--ink);
}
dialog::backdrop { background: rgba(10, 20, 16, .45); }
.settings-form { padding: 18px; display: flex; flex-direction: column; gap: 14px; }
.settings-form h2 { margin: 0; font-size: 20px; }
.field { display: flex; flex-direction: column; gap: 5px; font-weight: 600; font-size: 14px; }
.field small { font-weight: 400; color: var(--muted); }
.field input[type="range"] { accent-color: var(--accent); }
.check { display: flex; gap: 8px; align-items: center; font-size: 14px; }
.settings-form p { margin: 0; }

/* ---------- install card ---------- */
.install { position: relative; }
.install-row { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.install-text { flex: 1 1 200px; min-width: 0; display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.install-text p { margin: 0; }
.qr { background: #fff; border-radius: 12px; padding: 8px; line-height: 0; flex: none; }
.qr:empty { display: none; }
.qr svg, .qr img { width: 150px; height: 150px; display: block; }
.url { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; color: var(--muted); word-break: break-all; }
.close {
  position: absolute; top: 8px; right: 10px; border: 0; background: none; font-size: 22px; line-height: 1;
  color: var(--muted); cursor: pointer; padding: 4px 8px;
}
.talk-btn { align-self: flex-start; margin-top: 8px; }
.details { font: 11px/1.4 ui-monospace, Consolas, monospace; color: var(--muted); margin-top: 6px; word-break: break-word; }

/* ---------- coach ---------- */
.bubble.coach { display: flex; flex-direction: column; gap: 8px; }
.say-en { margin: 0; font-size: 16px; line-height: 1.45; }
.say-zh { background: var(--accent-soft); border-radius: 12px; padding: 8px 10px; }
.verdict { display: inline-block; margin-top: 4px; font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 999px; }
.verdict.good { background: var(--good); color: var(--ground); }
.verdict.close { background: var(--fix); color: var(--ground); }
.verdict.retry { background: var(--surface-2); color: var(--err); border: 1px solid var(--err); }
.me .bubble.latin { font-family: var(--ui); font-size: 16px; }

/* Talking with Lìlì needs no buttons: she listens by herself; tap her to pause. */
.coach-mode .controls, .coach-mode .type-form { display: none !important; }
.coach-mode .status { font-size: 16px; padding-bottom: 6px; }
.coach-mode #stage .lili { cursor: pointer; }
pre.log { font: 11px/1.45 ui-monospace, Consolas, monospace; background: var(--surface-2); border-radius: 10px; padding: 10px; max-height: 260px; overflow: auto; white-space: pre-wrap; word-break: break-word; margin: 0; }
.coach-note { font-size: 13px; color: var(--muted); border-top: 1px dashed var(--line); padding-top: 6px; }

/* ---------- Lena (German) ---------- */
.lili.lena { --av-hair: #C8963E; --av-top: #2A4F8F; --av-bg: #DCE6F5; --av-skin: #F7DFD0; --av-cheek: #F0A3A0; }
@media (prefers-color-scheme: dark) { .lili.lena { --av-bg: #1E2A40; --av-top: #5B86D6; } }
.lena-card { display: flex; gap: 14px; align-items: center; }
.lena-card .lili { width: 96px; cursor: pointer; }
.lena-text { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.lena-text p { margin: 0; }
.seg { display: inline-flex; background: var(--surface-2); border-radius: 999px; padding: 3px; }
.seg button { border: 0; background: none; padding: 6px 12px; border-radius: 999px; font-weight: 600; font-size: 13px; color: var(--muted); cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 1px 2px rgba(0, 0, 0, .08); }
.de-fix { font-size: 16px; font-weight: 600; }
@media (max-width: 380px) { .lena-card { flex-direction: column; align-items: flex-start; } }