:root {
  color-scheme: light;
  --bg:#f7f8fa; --paper:#fff; --ink:#242c3a; --muted:#5e6a7c; --faint:#6f7a8d;
  --line:#e2e7ef; --accent:#405e91; --accent-dark:#36527f; --accent-soft:#e9eff9;
  --hero:#ecf1f9; --pass:#246b55; --pass-bg:#eef7f3; --fail:#a13f45; --fail-bg:#fbefef;
  --warn:#855622; --warn-bg:#fbf4e8; --sidebar:228px;
  --font:"DM Sans","Segoe UI","Microsoft YaHei UI","PingFang SC",sans-serif;
  --english:"Instrument Sans","Segoe UI",sans-serif;
}
:root[data-theme=dark] {
  color-scheme:dark;
  --bg:#1a1f29; --paper:#222a38; --ink:#e8eef8; --muted:#b7c2d3; --faint:#a7b4ca;
  --line:#384559; --accent:#a8c3ff; --accent-dark:#c2d3ff; --accent-soft:#293953;
  --hero:#26364f; --pass:#91d5ba; --pass-bg:#223c37; --fail:#ffb3b3; --fail-bg:#472c35;
  --warn:#f5ca90; --warn-bg:#42392d;
}
* { box-sizing:border-box }
body { margin:0; background:var(--bg); color:var(--ink); font:14px/1.65 var(--font) }
a { color:var(--accent); text-decoration:none }
button,input,textarea,select { font:inherit; color:inherit }
button,.button { display:inline-flex; align-items:center; justify-content:center; gap:7px; min-height:37px; padding:7px 13px; border:1px solid var(--line); border-radius:8px; background:var(--paper); color:var(--ink); cursor:pointer; font-weight:600; line-height:1.35; text-align:center }
button:hover,.button:hover { border-color:var(--accent); background:var(--accent-soft) }
.primary { background:#405e91; color:#fff; border-color:#405e91 }
.primary:hover { background:#344f80; color:#fff; border-color:#344f80 }
button:disabled { opacity:.46; cursor:default }
button.link-btn { padding:0; min-height:0; border:0; background:none; color:var(--accent); font-weight:600 }
:focus-visible { outline:2px solid var(--accent); outline-offset:3px }
input[type=text],input[type=number],input[type=date],textarea,select { background:var(--paper); border:1px solid var(--line); border-radius:8px; padding:9px 11px; min-width:0 }
input[type=checkbox] { accent-color:#405e91; width:16px; height:16px; margin:0 3px 0 0; vertical-align:middle }
input[type=text],textarea { width:100% }
input[type=file] { max-width:100% }
textarea { resize:vertical; line-height:1.65; min-height:76px }
textarea.en,input.en { font:16px/1.7 var(--english) }
.en { font-family:var(--english) }
input::placeholder,textarea::placeholder { color:var(--faint) }
input.short { font-size:19px; max-width:720px; min-height:49px }
h1,h2,h3,p,dl { margin:0 }
h1 { font-size:32px; line-height:1.22; letter-spacing:-.035em; font-weight:740 }
h2 { font-size:21px; line-height:1.4; letter-spacing:-.015em }
h3 { font-size:15px; line-height:1.5 }
p + p { margin-top:8px }
small,.muted { color:var(--muted) }
.subtle { color:var(--faint); font-size:12px }
.sr-only,.skip-link:not(:focus) { position:absolute; height:1px; width:1px; clip-path:inset(50%); overflow:hidden; white-space:nowrap }
.skip-link:focus { position:fixed; left:10px; top:10px; background:var(--paper); padding:10px; z-index:9 }
#shell { display:grid; grid-template-columns:var(--sidebar) minmax(0,1fr); min-height:100vh }
.sidebar { position:sticky; top:0; height:100vh; display:flex; flex-direction:column; background:var(--paper); border-right:1px solid var(--line); padding:25px 14px 16px; overflow:auto }
.brand { display:flex; align-items:center; gap:11px; color:var(--ink); padding:0 8px 26px; white-space:nowrap }
.brand-mark { display:grid; place-items:center; border-radius:10px; background:#405e91; color:#fff; font-size:15px; font-weight:700; letter-spacing:-.06em; width:39px; height:39px; flex:none }
.brand strong,.brand small { display:block; line-height:1.5 }
.brand small { color:var(--muted); font-size:10px; letter-spacing:.01em }
.nav-group { display:grid; gap:3px; padding-bottom:15px }
.nav-title { margin:8px 12px 3px; font-size:11px; color:var(--faint); letter-spacing:.08em; font-weight:600 }
.nav-item { display:flex; gap:11px; align-items:center; border-radius:7px; color:var(--muted); padding:8px 10px; min-height:36px; line-height:1.35 }
.nav-item:hover { background:var(--bg); color:var(--ink) }
.nav-item[aria-current=page] { background:var(--accent-soft); color:var(--accent-dark); font-weight:700 }
.nav-glyph { width:18px; flex:none; text-align:center; font:600 14px/1 var(--english); color:var(--accent) }
.sidebar-foot { display:flex; align-items:center; gap:8px; font-size:11px; color:var(--muted); margin-top:auto; padding:15px 9px 0; border-top:1px solid var(--line) }
.save-dot { width:6px; height:6px; border-radius:50%; background:#5e9b86; flex:none }
.topbar { position:sticky; top:0; z-index:3; display:flex; align-items:center; justify-content:space-between; gap:12px; min-height:63px; border-bottom:1px solid var(--line); padding:0 34px; background:var(--paper) }
#breadcrumb { font-weight:650 }
.top-actions,.actions,.chips,.compact { display:flex; align-items:center; gap:8px; flex-wrap:wrap }
.top-actions { gap:16px }
.top-actions select { padding:5px 9px; font-size:12px }
.top-report { font-size:12px; white-space:nowrap }
#main { max-width:1280px; margin:0 auto; padding:29px 34px 45px; outline:none }
.hero { display:grid; grid-template-columns:minmax(0,1fr) minmax(238px,33%); gap:30px; align-items:center; background:var(--hero); border:1px solid var(--line); border-radius:15px; padding:25px 30px; margin-bottom:24px }
.hero h1 { font-family:var(--english); font-size:clamp(46px,5.1vw,68px); line-height:1; letter-spacing:-.065em; margin:5px 0 10px }
.hero .actions { margin-top:17px }
.eyebrow { font-size:12px; font-weight:700; color:var(--accent-dark); letter-spacing:.03em }
.hero-stat { border-left:1px solid color-mix(in srgb,var(--accent) 23%,var(--line)); padding-left:24px; display:grid; gap:8px }
.hero-stat a { color:inherit }
.statrow { display:flex; align-items:baseline; justify-content:space-between; gap:12px; color:var(--muted); font-size:13px }
.statrow strong { color:var(--ink); font:650 16px/1.4 var(--english) }
progress { display:block; appearance:none; width:100%; height:5px; border:0; border-radius:8px; background:var(--line); overflow:hidden }
progress::-webkit-progress-bar { background:var(--line) }
progress::-webkit-progress-value { background:#6786b5; border-radius:8px }
.plan-grid { display:grid; grid-template-columns:1fr 1fr; gap:20px }
.plan-block { min-width:0 }
.section-head,.page-head,.bar-head { display:flex; align-items:center; justify-content:space-between; gap:14px }
.section-head { padding:0 1px 10px }
.section-head h2 { font-size:17px }
.section-head span { color:var(--muted); font-size:12px; white-space:nowrap }
.task-list { background:var(--paper); border:1px solid var(--line); border-radius:12px; overflow:hidden }
.task { display:grid; grid-template-columns:31px minmax(0,1fr) auto 14px; gap:10px; align-items:center; color:var(--ink); padding:12px 13px; min-height:63px }
.task+.task { border-top:1px solid var(--line) }
.task:hover { background:var(--accent-soft) }
.task-title { font-weight:700; display:block; white-space:nowrap; overflow:hidden; text-overflow:ellipsis }
.task-mini { display:block; color:var(--muted); font-size:11px }
.task-index { display:grid; place-items:center; background:var(--bg); border:1px solid var(--line); color:var(--accent); border-radius:8px; height:29px; font:650 11px/1 var(--english) }
.task-end { font-size:12px; color:var(--muted); white-space:nowrap; text-align:right }
.task-end span { display:block; font-size:10px }
.home-foot { display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px; margin-top:20px; padding:13px 2px 0; border-top:1px solid var(--line); color:var(--muted); font-size:12px }
.page-head { align-items:flex-start; margin-bottom:17px }
.page-head h1 { margin:3px 0 6px }
.page-head p { color:var(--muted) }
.badge { display:inline-flex; align-items:center; color:var(--accent-dark); background:var(--accent-soft); border-radius:6px; padding:3px 7px; font-size:11px; line-height:1.35; font-weight:650; white-space:nowrap }
.badge.pass { background:var(--pass-bg); color:var(--pass) }
.badge.fail { background:var(--fail-bg); color:var(--fail) }
.badge.warn { background:var(--warn-bg); color:var(--warn) }
.panel { padding:20px 22px; border-radius:12px; border:1px solid var(--line); background:var(--paper); min-width:0 }
.stack { display:grid; gap:13px }
.module-meta { margin-bottom:15px; padding:12px 15px; font-size:12px }
.module-meta progress { margin-top:8px }
.module-layout { display:grid; grid-template-columns:minmax(0,1fr) 206px; gap:15px; align-items:start }
.module-layout > .question { min-width:0 }
.module-side { display:grid; gap:10px }
.mini-panel { padding:13px }
.mini-panel h3 { font-size:12px; margin-bottom:8px }
.q-grid { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:5px }
.q-grid button { min-height:29px; padding:4px 2px; font-size:10px; font-family:var(--english) }
.q-grid button.active { background:var(--accent-soft); color:var(--accent-dark); border-color:var(--accent) }
.q-grid button.done:not(.active) { background:var(--pass-bg); color:var(--pass) }
.q-grid button.error:not(.active) { background:var(--fail-bg); color:var(--fail) }
.q-grid button.flag:not(.active) { background:var(--warn-bg); color:var(--warn) }
.q-grid .mini-label { grid-column:1/-1; margin:6px 0 1px; font-size:10px; color:var(--muted) }
.q-grid .mini-label:first-child { margin-top:0 }
.timer { display:flex; justify-content:space-between; align-items:center; gap:8px; margin-top:8px }
.timer output { font:650 19px/1 var(--english); font-variant-numeric:tabular-nums }
.timer button { min-height:29px; font-size:11px; padding:4px 7px }
.question-head { display:flex; align-items:center; justify-content:space-between; gap:9px; margin-bottom:12px }
.question h2.prompt { font-size:23px; margin-bottom:6px; overflow-wrap:anywhere }
.question .prompt.en { line-height:1.56; letter-spacing:0; font-size:21px }
.question .editor { margin-top:14px }
.editor > .actions { margin-top:8px }
.question,#question-title { scroll-margin-top:78px }
.self-check { max-width:390px }
.question-foot { flex-wrap:wrap }
.field-label { display:block; font-size:12px; font-weight:650; margin:0 0 5px }
.field-grid { display:grid; grid-template-columns:1fr 1fr; gap:10px }
.field-grid .wide { grid-column:1/-1 }
.edit-large { min-height:147px }
.question-foot { margin-top:14px; padding-top:13px; border-top:1px solid var(--line) }
.feedback { padding:13px 14px; background:var(--bg); border:1px solid var(--line); border-radius:8px; margin-top:13px; overflow-wrap:anywhere }
.feedback.good { background:var(--pass-bg) }
.feedback.bad { background:var(--fail-bg) }
.feedback ul { margin:5px 0 0; padding-left:20px }
.answer { font-family:var(--english); white-space:pre-wrap; font-size:16px; line-height:1.7; margin:5px 0; overflow-wrap:anywhere }
.feedback .answer strong { font-size:20px }
.checks { display:flex; flex-wrap:wrap; gap:6px 12px; margin-top:7px }
.checks label,.check { display:inline-flex; gap:5px; align-items:center; font-size:12px }
.review-fields { display:grid; gap:9px; margin-top:12px }
.self-check { display:flex; align-items:center; justify-content:space-between; gap:10px; font-size:12px }
.self-check select { padding:4px 7px }
.original { white-space:pre-wrap; overflow-wrap:anywhere; margin-top:6px }
mark { background:#e0eafe; color:#233d65; border-radius:3px; padding:0 2px }
.callout { border-left:3px solid #7891bc; background:var(--accent-soft); padding:10px 12px; border-radius:0 8px 8px 0; margin:10px 0; font-size:13px }
.key-guide { display:flex; gap:10px; flex-wrap:wrap; font-size:11px; color:var(--muted) }
kbd { font:11px/1.2 var(--english); color:var(--muted); background:var(--bg); border:1px solid var(--line); border-radius:4px; padding:2px 4px }
.result-line { font-size:12px; margin-top:9px; color:var(--muted) }
.audio-panel { margin-bottom:14px; padding:13px 15px }
.audio-panel audio { width:100%; height:40px; margin-top:6px }
.audio-panel .actions input { max-width:89px }
.audio-panel details { margin-top:6px }
details > summary { cursor:pointer; font-weight:650 }
.diff-table { width:100%; border-collapse:collapse; margin:8px 0; font-size:12px }
.diff-table th,.diff-table td { text-align:left; padding:7px; border-bottom:1px solid var(--line); vertical-align:top; overflow-wrap:anywhere }
.diff-table select { padding:4px; max-width:100%; font-size:11px }
.scroll-table { overflow:auto }
.group-pills { display:flex; gap:6px; flex-wrap:wrap; margin:9px 0 }
.mistake-list { display:grid; gap:8px; margin-top:11px }
.mistake-row { padding:10px 12px; border:1px solid var(--line); border-radius:8px }
.mistake-row summary { color:var(--ink) }
.mistake-row .inside { padding:9px 0 0 }
.mistake-row dt { color:var(--muted); font-size:12px }
.mistake-row dd { margin:0 0 7px; white-space:pre-wrap; overflow-wrap:anywhere }
.report-head { background:var(--hero) }
.report-preview { max-height:520px; overflow:auto; font:13px/1.8 var(--font); white-space:pre-wrap; overflow-wrap:anywhere }
.settings-grid { display:grid; grid-template-columns:1fr 1fr; gap:12px }
.settings-grid h2 { margin-bottom:4px }
.settings-grid p { margin-bottom:12px }
#notice { position:fixed; bottom:18px; right:22px; max-width:min(460px,90vw); background:var(--ink); color:var(--paper); padding:9px 13px; border-radius:8px; box-shadow:0 3px 16px #0002; z-index:8; font-size:13px }
#notice:empty { display:none }
dialog { width:min(440px,calc(100vw - 32px)); border:1px solid var(--line); border-radius:12px; background:var(--paper); color:var(--ink); padding:22px }
dialog::backdrop { background:#17223870 }
dialog p { margin:8px 0 16px }
.danger { color:var(--fail) }
@media(max-width:1070px) {
 :root { --sidebar:192px }
 #main { padding-inline:22px }
 .topbar { padding-inline:22px }
 .module-layout { grid-template-columns:minmax(0,1fr) 169px }
 .hero { padding:23px }
 .task { gap:7px; padding-inline:10px }
}
@media(max-width:820px) {
 :root { --sidebar:58px }
 .sidebar { padding-inline:7px }
 .brand { padding-inline:1px }
 .brand span:nth-child(2),.nav-label,.nav-title,.sidebar-foot { display:none }
 .nav-item { justify-content:center; padding-inline:0 }
 .hero { grid-template-columns:1fr 1fr; gap:15px }
 .plan-grid { gap:10px }
 .task-end { font-size:11px }
}
@media(max-width:620px) {
 #main { padding:16px 12px }
 .topbar { padding-inline:12px }
 .top-actions { gap:4px }
 .top-report { display:none }
 .hero,.plan-grid,.module-layout,.settings-grid,.field-grid { grid-template-columns:1fr }
 .hero-stat { border-left:0; border-top:1px solid var(--line); padding:10px 0 0 }
 .module-side { grid-row:1 }
 .q-grid { grid-template-columns:repeat(8,minmax(0,1fr)) }
 .panel { padding:14px }
 .page-head { flex-wrap:wrap }
}
@media(prefers-reduced-motion:no-preference) {
 button,a.task { transition:background-color .14s,border-color .14s }
}


:root { --sidebar:190px; --topbar-height:49px }
:root[data-sidebar=compact] { --sidebar:56px }
.topbar { min-height:var(--topbar-height); padding-inline:24px }
.top-left { display:flex; align-items:center; flex-wrap:wrap; gap:10px }
.top-left button,.top-actions button { min-height:30px; min-width:31px; padding:3px 7px }
.top-home { font-size:12px }
#breadcrumb { padding-left:9px; border-left:1px solid var(--line) }
#main { padding:18px 24px 30px }
.sidebar { padding-top:16px }
.brand { padding-bottom:17px }
.nav-group { padding-bottom:10px }
:root[data-sidebar=compact] .sidebar { padding-inline:6px }
:root[data-sidebar=compact] .brand { padding-inline:2px }
:root[data-sidebar=compact] .brand span:nth-child(2),
:root[data-sidebar=compact] .nav-label,
:root[data-sidebar=compact] .nav-title,
:root[data-sidebar=compact] .sidebar-foot { display:none }
:root[data-sidebar=compact] .nav-item { justify-content:center; padding-inline:0 }
.module-bar { display:grid; grid-template-columns:minmax(135px, .75fr) minmax(180px, 1fr) auto; gap:16px; align-items:center; padding:10px 14px; margin-bottom:10px; border:1px solid var(--line); border-radius:10px; background:var(--paper) }
.module-bar h1 { font-size:25px; margin-top:2px }
.module-meta { display:grid; gap:3px; margin:0; padding:0; color:var(--muted) }
.module-meta strong { color:var(--ink); font-size:14px }
.module-meta progress { margin-top:3px }
.module-tools,.vocab-modes { display:flex; align-items:center; flex-wrap:wrap; gap:9px }
.module-tools .timer { margin:0; padding:2px 8px; border-radius:7px; background:var(--bg) }
.module-tools .timer output { font-size:17px }
.module-tools .timer button { min-height:25px }
.vocab-modes { margin:2px 0 8px; justify-content:flex-end; font-size:12px }
.vocab-modes button,.vocab-modes .button,.module-tools .button { min-height:31px; padding:5px 9px }
.round-menu,.question-picker { position:relative; z-index:2 }
.round-menu[open],.question-picker[open] { z-index:6 }
.round-menu .panel,.question-picker .panel { position:absolute; top:calc(100% + 5px); right:0; padding:11px; min-width:228px; box-shadow:0 4px 15px #202c3a12; max-height:min(58vh,390px); overflow:auto }
.round-menu .panel { display:grid; gap:5px }
.question-picker .panel { min-width:237px }
.module-layout { display:block }
.question { padding:17px 20px 0 }
.question-head { margin-bottom:7px }
.question h2.prompt { margin-bottom:2px }
.question .prompt.en { line-height:1.47 }
.question .editor { margin-top:10px }
.question .usage-hint { margin-top:4px }
.question .feedback { margin-top:10px }
.question .feedback p + p { margin-top:4px }
.question .feedback .actions { margin-top:8px }
.question-foot { position:sticky; bottom:0; z-index:1; margin:12px -20px 0; padding:8px 20px; background:var(--paper); border-radius:0 0 11px 11px }
.question-foot button { min-height:33px; padding:5px 10px }
.question-foot .key-guide { align-self:center; color:var(--muted) }
.answer-more { margin-top:9px; color:var(--muted) }
.answer-more summary { color:var(--ink) }
.answer-more ol { margin-block:5px 8px; padding-left:24px }
.syntax-grid,.syntax-summary { display:grid; grid-template-columns:1fr 1fr; align-items:start; gap:9px 12px }
.syntax-grid .wide,.syntax-summary > :first-child { grid-column:1/-1 }
.syntax-grid input.short { max-width:none; font-size:16px; min-height:40px }
.syntax-grid textarea { min-height:100px }
.syntax-summary { margin-top:12px }
.syntax-summary > div { padding:7px 10px; background:var(--bg); border-radius:7px; min-width:0 }
.syntax-summary .original { margin-top:2px }
.syntax-compared { margin-top:9px }
.shortcut-list { display:grid; grid-template-columns:minmax(92px,auto) 1fr; gap:7px 12px; margin-top:14px }
.shortcut-list dt { font-weight:700 }
.shortcut-list dd { margin:0; color:var(--muted) }
.rules { margin-top:6px; font-size:12px; color:var(--muted) }
#objective-result:focus-visible { outline-offset:2px }
@media (max-width:840px) {
  :root { --sidebar:58px }
  #main { padding-inline:14px }
  .topbar { padding-inline:14px }
  .module-bar { grid-template-columns:1fr auto; gap:8px }
  .module-bar .module-meta { grid-row:2; grid-column:1/-1 }
  .module-bar .module-tools { grid-row:1; grid-column:2; justify-content:flex-end }
}
@media (max-width:575px) {
  .syntax-grid,.syntax-summary { grid-template-columns:1fr }
  .question { padding:13px 11px 0 }
  .question-foot { margin-inline:-11px; padding-inline:11px }
  .top-home,.question-foot .key-guide { display:none }
  .question-picker .panel { min-width:185px }
  .q-grid { grid-template-columns:repeat(4,minmax(0,1fr)) }
}

[hidden] { display:none !important }
.mobile-nav { display:none }
#sync-status { font-size:12px; color:var(--muted); background:var(--bg); border-radius:7px; padding:5px 8px; white-space:nowrap }
#sync-status[data-connected=true] { background:var(--pass-bg); color:var(--pass) }
.sync-panel p { margin-top:7px; overflow-wrap:anywhere }
.sync-panel .actions { margin-top:8px }
#sync-code-value:not(:empty) { font-weight:700; letter-spacing:.02em; color:var(--accent) }
#pair-dialog { width:min(420px,calc(100% - 24px)); max-height:calc(100dvh - 24px); overflow:auto }
#pair-dialog .actions { margin-top:12px }
#pair-message { color:var(--muted); margin-top:8px }
#sync-invite:not(:empty) { margin-top:12px }
#sync-invite img { display:block; max-width:100%; height:auto; border:1px solid var(--line); border-radius:10px }
#sync-invite button { margin-top:8px }
@media (max-width:620px) {
  :root { --topbar-height:54px; --mobile-nav:calc(56px + env(safe-area-inset-bottom,0px)) }
  #shell { display:block }
  .sidebar,.top-home,#shortcut-button { display:none }
  .topbar { padding-inline:12px; gap:6px }
  .top-left { min-width:0 }
  #sidebar-toggle { display:none }
  #breadcrumb { border:0; padding:0; font-size:14px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap }
  .top-actions { flex-wrap:nowrap; gap:6px }
  .top-actions select { max-width:100px; font-size:16px; padding:5px 4px }
  #sync-status { font-size:11px; white-space:normal; line-height:1.3; padding:5px; max-width:102px; text-align:center }
  #main { padding:12px 10px calc(var(--mobile-nav) + 18px) }
  .mobile-nav { position:fixed; inset:auto 0 0; z-index:5; display:grid; grid-template-columns:repeat(5,minmax(0,1fr)); height:var(--mobile-nav); padding:3px 8px env(safe-area-inset-bottom,0px); border-top:1px solid var(--line); background:var(--paper) }
  .mobile-nav a { display:grid; justify-items:center; align-content:center; gap:1px; min-height:46px; color:var(--muted); border-radius:9px; font-size:11px; font-weight:650 }
  .mobile-nav a span { font-size:17px; line-height:1.2; font-weight:720 }
  .mobile-nav a[aria-current=page] { color:var(--accent); background:var(--accent-soft) }
  .hero { padding:18px; gap:12px; margin-bottom:14px }
  .hero h1 { font-size:44px }
  .module-bar { padding:9px; grid-template-columns:minmax(0,1fr) auto }
  .module-bar h1 { font-size:21px }
  .module-tools { flex-wrap:wrap; gap:5px }
  .module-tools .timer button,.module-tools summary { padding:5px 7px }
  .question-foot { position:relative; bottom:auto }
  .question:has(#objective-result) .question-foot { position:sticky; bottom:var(--mobile-nav); box-shadow:0 -1px var(--line) }
  .question:has(.syntax-summary) .prompt { font-size:20px; line-height:1.5 }
  .question-foot > .actions { width:100%; gap:5px }
  .question-foot .actions button { flex:1 1 auto; min-height:44px; padding-inline:6px }
  #main :is(input[type=text],input[type=number],input[type=date],textarea,select),#pair-code { font-size:16px }
  .question-picker .panel { width:min(290px,calc(100vw - 34px)) }
  .panel :is(p,pre),.original { overflow-wrap:anywhere }
  #notice { bottom:calc(var(--mobile-nav) + 6px) }
  #main audio { width:100% }
}