:root {
  --bg: #f5f6f8; --card: #ffffff; --text: #1b1f24; --muted: #6a737d; --line: #dfe3e8;
  --accent: #1f6feb; --accent-text: #ffffff; --tutor: #e8f0fe; --user: #e9f7ec; --warn: #fff4d6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151a; --card: #1b2027; --text: #e6e9ee; --muted: #98a2b0; --line: #2b323c;
    --accent: #4c8dff; --accent-text: #0b1220; --tutor: #1d2a42; --user: #1c3224; --warn: #3a3017;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 640px; margin: 0 auto; padding: 16px; }
h1 { margin: 8px 0 16px; font-size: 24px; }
h2 { font-size: 16px; margin: 0 0 8px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px; margin-bottom: 14px; display: grid; gap: 12px; }
label { display: grid; gap: 6px; font-size: 14px; color: var(--muted); }
.row { display: flex; gap: 8px; align-items: center; }
.row > select, .row > input { flex: 1; }
select, input[type=text] { width: 100%; padding: 10px 12px; font-size: 16px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--text); }
button { padding: 10px 14px; font-size: 16px; border-radius: 10px; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-text); cursor: pointer; }
button.ghost { background: transparent; color: var(--accent); }
button.primary { padding: 14px; font-weight: 600; }
button:disabled { opacity: .5; cursor: default; }
.muted { color: var(--muted); font-size: 14px; }
.warn { background: var(--warn); border-radius: 10px; padding: 10px 12px; }
.radio, .check { display: flex; gap: 8px; align-items: center; color: var(--text); }
.tabs button { flex: 1; background: transparent; color: var(--text); border-color: var(--line); }
.tabs button.on { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
ul { margin: 0; padding-left: 18px; }
main[hidden] { display: none; }
.form { display: grid; gap: 12px; }
.form[hidden] { display: none; }
input[type=password], input[type=text] { width: 100%; padding: 10px 12px; font-size: 16px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--text); }
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.topbar h1 { margin: 8px 0; }
summary { cursor: pointer; font-size: 15px; }
/* --- awatar --- */
.av-wrap { position: relative; width: 100%; height: 100%; }
.av-svg { display: block; width: 100%; height: 100%; border-radius: 50%; }
.av-body { transform-origin: 100px 200px; animation: avbreathe 4s ease-in-out infinite; }
.av-head { transform-origin: 100px 150px; transition: transform .35s ease; }
.av-eye { transform-box: fill-box; transform-origin: center; animation: avblink 4.6s infinite; }
.av-pupil { transition: transform .4s ease; }
.av-brow { transition: transform .3s ease; }
.av-listening .av-head { transform: rotate(3deg); }
.av-listening .av-brow { transform: translateY(-2px); }
.av-listening .av-svg { box-shadow: 0 0 0 4px rgba(46, 160, 67, .45); animation: avpulse 1.4s ease-in-out infinite; }
.av-thinking .av-pupil { transform: translate(2.6px, -2.4px); }
.av-thinking .av-head { transform: rotate(-3deg); }
.av-speaking .av-head { animation: avtalk .7s ease-in-out infinite; }
.av-dots { position: absolute; top: 4%; right: 2%; display: none; gap: 3px; }
.av-thinking .av-dots { display: flex; }
.av-dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); animation: avdot 1s infinite; }
.av-dots i:nth-child(2) { animation-delay: .2s; }
.av-dots i:nth-child(3) { animation-delay: .4s; }
@keyframes avblink { 0%, 93%, 100% { transform: scaleY(1); } 96% { transform: scaleY(.08); } }
@keyframes avbreathe { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(1.6px); } }
@keyframes avtalk { 0%, 100% { transform: rotate(0) translateY(0); } 50% { transform: rotate(-1.2deg) translateY(-1px); } }
@keyframes avpulse { 50% { box-shadow: 0 0 0 8px rgba(46, 160, 67, .18); } }
@keyframes avdot { 0%, 100% { opacity: .25; } 50% { opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .av-body, .av-eye, .av-speaking .av-head, .av-listening .av-svg, .av-dots i { animation: none; } }
.av-stage { width: 150px; height: 150px; margin: 0 auto 4px; flex: none; }
#lesson .av-stage { width: 110px; height: 110px; margin: 6px auto 0; }
.av-editor { display: grid; gap: 12px; }
.av-sw { display: flex; flex-wrap: wrap; gap: 8px; }
.av-sw button { width: 30px; height: 30px; padding: 0; border-radius: 50%; border: 2px solid var(--line); }
.av-sw button.on { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent); }
.av-opts { display: flex; flex-wrap: wrap; gap: 8px; }
.av-opts button { background: transparent; color: var(--text); border-color: var(--line); padding: 6px 12px; font-size: 14px; }
.av-opts button.on { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.tones { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.tchip { font-size: 13px; padding: 3px 8px; border-radius: 999px; border: 1px solid var(--line); background: var(--card); }
.tchip.good { border-color: #2ea043; }
.tchip.bad { border-color: #d73a49; }
.tchip.maybe { border-color: #d29922; }
.tchip.skip { color: var(--muted); }
.contour { display: block; width: 100%; max-width: 320px; height: auto; margin-top: 8px; border-radius: 8px; background: var(--card); border: 1px solid var(--line); }

#lesson { display: flex; flex-direction: column; height: 100dvh; padding-bottom: 0; }
#lesson[hidden], #setup[hidden] { display: none; }
#lesson header { display: flex; justify-content: space-between; align-items: center; gap: 8px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
#chat { flex: 1; overflow-y: auto; padding: 12px 0; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 88%; padding: 10px 12px; border-radius: 14px; white-space: pre-wrap; }
.msg.tutor { background: var(--tutor); align-self: flex-start; border-bottom-left-radius: 4px; }
.msg.user { background: var(--user); align-self: flex-end; border-bottom-right-radius: 4px; }
.msg .seg.target { font-weight: 600; }
.msg .seg.pl { font-weight: 400; }
.msg .score { display: inline-block; margin-top: 6px; font-size: 13px; color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.chip { font-size: 13px; padding: 3px 8px; border-radius: 999px; border: 1px solid var(--line); background: var(--card); }
.note { align-self: center; font-size: 13px; color: var(--muted); }
#repeatBar, #levelBar { background: var(--warn); border-radius: 10px; padding: 8px 12px; margin-bottom: 8px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
#repeatBar[hidden], #levelBar[hidden] { display: none; }
#lesson footer { padding: 8px 0 calc(12px + env(safe-area-inset-bottom)); display: grid; gap: 6px; }
.mic { width: 56px; height: 56px; border-radius: 50%; font-size: 24px; padding: 0; flex: none; }
.mic.listening { background: #d73a49; border-color: #d73a49; animation: pulse 1s infinite; }
@keyframes pulse { 50% { transform: scale(1.08); } }