:root{--bg:#0a0b0f;--bg2:#0d0f15;--surface:#111420;--surface2:#161a28;--raise:#1c2130;--line:#232a3c;--line2:#313a52;--ink:#eef1f7;--ink-dim:#b7bfd0;--muted:#7c8698;--violet:#7b6cff;--ember:#ff6b3d;--cyan:#38e0c8;--grad:linear-gradient(115deg,#7b6cff 0%,#a05cff 42%,#ff6b3d 100%);--grad-soft:linear-gradient(115deg,rgba(123,108,255,.16),rgba(255,107,61,.12));--radius:18px;--body:Inter,system-ui,-apple-system,'Segoe UI',sans-serif;--display:Sora,system-ui,sans-serif}
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var(--line2);border-radius:10px;padding:14px;font-size:13px;cursor:pointer;background:var(--bg2);display:flex;gap:10px;align-items:center}.quiz-options label:has(input:checked){border-color:var(--violet);background:var(--grad-soft)}.quiz-options input{accent-color:var(--violet)}.quiz-result{margin-top:24px;border:1px solid var(--line2);border-radius:12px;padding:24px}.quiz-result strong{display:block;font-size:40px;line-height:1.3}.quiz-feedback{display:flex;gap:18px;padding:9px 0;border-top:1px solid var(--line)}.quiz-feedback span:first-child{width:90px;font-size:22px}.quiz-feedback span:last-child{font-size:13px}.success-text{color:var(--cyan)}.error-text{color:#ffb198}.result-row{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:18px 0;border-top:1px solid var(--line);font-size:13px}.result-row>span{font-size:11px;color:var(--muted)}.form-field{margin-bottom:22px}.form-field label,form p 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p{white-space:pre-wrap;word-break:break-word;line-height:1.85}.ai-answer:empty{display:none}.ai-answer{margin-top:24px;padding-top:24px;border-top:1px solid var(--line)}.ai-panel>.big-symbol{color:var(--violet)}.ai-history{margin-top:22px}.narrow{max-width:640px;margin:0 auto}.empty-state{text-align:center;padding:55px 25px}.empty-state h1{font-size:30px}.big-symbol{font-size:56px;line-height:1.3;display:block;color:#a999ff;margin-bottom:25px}.empty-state p{max-width:470px;margin:15px auto 25px}.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);background:var(--surface2);border:1px solid var(--line2);padding:15px 24px;border-radius:12px;max-width:90vw;box-shadow:0 10px 40px #0008;z-index:50;font-size:13px}.toast.error{border-color:#ff6b3d80;color:#ffb198}footer{border-top:1px solid var(--line);padding:22px 42px;color:var(--muted);font-size:9px;display:flex;gap:12px;flex-wrap:wrap;letter-spacing:.02em}footer>a{margin-left:auto;color:var(--ink-dim)}.public-shell{max-width:1440px;margin:auto}.public-header{display:flex;align-items:center;justify-content:space-between;padding:28px 54px;border-bottom:1px solid var(--line)}.public-shell main{padding:40px 54px 70px}.landing-hero{display:grid;grid-template-columns:1.1fr 1fr;align-items:center;min-height:580px;gap:35px}.hero-copy h1{font-size:clamp(42px,5.4vw,70px);line-height:1.05;letter-spacing:-.055em;margin:24px 0}.hero-copy>p{max-width:445px;font-size:16px;margin:25px 0 34px}.hero-facts{display:flex;gap:32px;margin-top:42px}.hero-facts>span{font-size:20px;font-weight:500}.hero-facts small{display:block;font-size:9px;margin-top:7px}.hero-art{position:relative;min-height:480px;display:grid;place-items:center;overflow:hidden;border:1px solid var(--line);border-radius:26px;background:radial-gradient(ellipse at 60% 30%,#7b6cff28,transparent 60%),radial-gradient(ellipse at 20% 90%,#ff6b3d12,transparent 60%),var(--bg2)}.hero-art:before{content:'';position:absolute;inset:0;background-image:linear-gradient(#ffffff03 1px,transparent 1px),linear-gradient(90deg,#ffffff03 1px,transparent 1px);background-size:40px 40px}.orbit{border:1px solid #7b6cff33;width:340px;height:340px;border-radius:50%;position:absolute}.orbit:before{content:'';border:1px solid #7b6cff22;border-radius:50%;position:absolute;inset:36px}.art-character{font-size:230px;color:#d8d0ff;position:relative;line-height:1.1;font-family:'Kaiti SC',KaiTi,serif;text-shadow:0 0 60px #7b6cff22;transform:rotate(-5deg)}.art-character span{display:block;font-size:10px;font-family:var(--body);letter-spacing:.17em;text-align:center;transform:rotate(5deg);color:var(--muted);margin-top:24px}.floating-tag{position:absolute;top:40px;right:28px;background:#161a28dc;border:1px solid var(--line2);padding:12px 20px;border-radius:11px;font-size:26px;transform:rotate(5deg)}.floating-tag small{display:block;font-size:10px;letter-spacing:.05em}.floating-tag.second{top:auto;bottom:58px;left:22px;right:auto;font-size:22px;transform:rotate(-4deg)}.art-counter{position:absolute;bottom:23px;right:24px;letter-spacing:.2em;font-size:10px;color:var(--muted)}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:35px}.feature-grid h2{font-size:22px}.feature-grid p{font-size:13px;margin:0}.auth-layout{display:grid;grid-template-columns:1.1fr 1fr;gap:70px;align-items:center;max-width:1000px;margin:45px auto}.auth-intro h1{font-size:45px;line-height:1.15}.auth-intro h1 span{display:block;font-size:76px;margin-top:25px}.auth-intro p{font-size:15px}.auth-panel{padding:35px}.auth-panel h2{font-size:22px;margin-bottom:30px}.auth-panel>.text-link{display:block;text-align:center;margin-top:24px}
@media(min-width:1600px){main{padding-top:50px}.daily-hero{min-height:340px}.daily-copy{max-width:75%}.daily-hero h2{font-size:42px}.daily-character{font-size:200px;right:45px}.plan-step{min-height:210px}.sidebar{padding-top:34px}}
@media(max-width:1150px){.app-shell{grid-template-columns:210px minmax(0,1fr)}main{padding:30px 26px 40px}.topbar{padding:0 26px}.sidebar{padding:25px 12px 16px}.sidebar .brand img{width:32px}.brand span{font-size:11px}.daily-copy{max-width:85%}.daily-character{opacity:.6;right:10px}.plan-grid{grid-template-columns:repeat(2,1fr)}.word-row{grid-template-columns:60px minmax(0,1fr)}.word-row small{display:none}.work-grid{grid-template-columns:repeat(2,1fr)}.hero-art{min-height:410px}.hero-facts{gap:20px}.hero-facts>span{font-size:17px}.public-header{padding:24px 30px}.public-shell main{padding:30px}.student-row{gap:12px}}
@media(max-width:850px){.app-shell{display:block}.sidebar{position:fixed;left:-260px;top:0;width:244px;height:100dvh;transition:left .2s;box-shadow:20px 0 60px #0008}.sidebar.open{left:0}.menu-toggle{display:block}.topbar{height:65px;padding:0 20px}.topbar-brand{margin-right:auto}.topbar-brand .muted,.topbar-actions>small,.topbar-actions>.status-dot{display:none}main{padding:26px 20px 40px}.dashboard-grid{grid-template-columns:minmax(0,1fr) 240px}.daily-copy{max-width:100%}.daily-character{display:none}.daily-hero h2{font-size:29px}.stats-grid{gap:12px}.stat{padding:16px}.lesson-columns{grid-template-columns:1fr}.cards-layout{grid-template-columns:1fr 1fr}.level-grid{grid-template-columns:repeat(2,1fr)}.student-row{flex-wrap:wrap}.student-name{min-width:180px}.hero-copy h1{font-size:49px}.hero-art{min-height:350px}.art-character{font-size:170px}.orbit{width:260px;height:260px}.floating-tag{font-size:20px;padding:8px 14px;top:26px}.floating-tag.second{bottom:35px;font-size:18px}.landing-hero{min-height:480px;gap:25px}.hero-copy>p{font-size:14px}.hero-facts{gap:16px;flex-wrap:wrap}.hero-facts>span{font-size:14px}.hero-facts small{font-size:8px}.auth-layout{gap:30px}.auth-intro h1{font-size:36px}.feature-grid{gap:16px}.feature-grid .panel{padding:22px}.feature-grid h2{font-size:18px}.feature-grid p{font-size:12px}footer{padding:22px 20px}}
@media(max-width:600px){h1{font-size:28px}.page-heading{align-items:flex-start;margin-bottom:24px}.page-heading .chip{font-size:9px;padding:7px}.page-heading p{font-size:12px}.eyebrow{font-size:9px}.dashboard-grid,.cards-layout{grid-template-columns:1fr}.daily-hero{min-height:290px}.daily-hero h2{font-size:31px}.daily-hero p{max-width:90%}.panel{padding:22px;border-radius:14px}.daily-character{display:block;font-size:130px;opacity:.3;right:0;top:40px}.daily-copy{max-width:100%}.daily-hero .actions{gap:12px}.review-tile{display:grid;grid-template-columns:1fr auto;align-items:center;gap:12px}.review-tile .feature-icon{display:none}.review-tile h2{margin:0;max-width:170px}.review-tile .metric-number{font-size:36px}.review-tile p{grid-column:1/-1;margin:0}.review-tile .btn{grid-column:1/-1}.stats-grid{grid-template-columns:repeat(2,1fr);margin:18px 0 30px}.stats-grid.three{grid-template-columns:repeat(3,1fr)}.three .stat{padding:13px}.stat strong{font-size:25px}.three .stat>span{font-size:10px}.plan-grid{gap:12px}.plan-step{min-height:172px;padding:18px}.plan-step>span{margin-bottom:20px}.plan-step h3{font-size:13px}.plan-step p{font-size:10px}.lesson-row{padding:18px 14px;gap:12px;flex-wrap:wrap}.lesson-number{font-size:22px;min-width:30px}.lesson-row>div{min-width:65%}.lesson-row h2{font-size:17px}.lesson-row .btn{margin-left:42px}.lesson-row .chip{margin-left:42px}.level-grid{gap:12px}.level-grid .panel{padding:18px}.level-grid .eyebrow{font-size:8px}.level-grid p{font-size:10px}.tabs{gap:0}.tab{padding:14px 12px;font-size:11px}.prose>p{font-size:14px}.chinese{font-size:29px}.writing-grid{gap:14px}.writing-pad{padding:12px}.writing-pad .btn{font-size:10px;padding:10px;min-height:38px}.writing-pad .actions{gap:8px}.writing-pad small{font-size:8px}.writing-pad>span{font-size:10px}.char-button{font-size:27px;min-width:54px}.uploads{grid-template-columns:1fr}.uploads>p{font-size:10px}.work-grid{grid-template-columns:1fr 1fr;gap:12px}.work-item{padding:12px}.work-item audio{width:100%}.quiz-options{grid-template-columns:1fr}.quiz-question h3{font-size:30px}.flashcard{padding:24px;min-height:410px}.flash-word{font-size:84px}.word-row{grid-template-columns:70px 90px minmax(0,1fr)}.word-row small{display:block}.result-row{gap:10px}.result-row>span{font-size:10px}.student-row .chip{font-size:10px}.student-name{min-width:120px}.student-row form{margin-left:46px}.public-header{padding:20px}.public-shell main{padding:25px 20px 40px}.public-header .brand span{font-size:10px}.public-header .brand img{width:32px}.public-header .topbar-actions{gap:7px}.language-form{padding-left:7px;margin-left:0}.landing-hero{grid-template-columns:1fr;gap:30px;padding-top:15px}.hero-copy h1{font-size:48px}.hero-copy>p{max-width:360px}.hero-facts{gap:28px;margin-top:30px}.hero-facts>span{font-size:16px}.hero-art{min-height:340px}.art-character{font-size:185px}.floating-tag.second{left:20px}.feature-grid{grid-template-columns:1fr;margin-top:26px}.feature-grid .panel{padding:25px}.auth-layout{grid-template-columns:1fr;margin:15px auto;gap:25px}.auth-intro h1{font-size:32px}.auth-intro h1 span{font-size:55px;margin-top:12px}.auth-intro .notice{margin-bottom:0}.auth-panel{padding:25px}.empty-state{padding:40px 22px}.empty-state h1{font-size:26px}footer{font-size:8px;gap:7px}footer>a{margin-left:0;width:100%;margin-top:7px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}.btn:hover{transform:none}}
.sidebar{overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--line2) transparent}.sidebar>.brand,.sidebar>nav,.sidebar-bottom{flex-shrink:0}@media(max-height:800px){.sidebar{padding-top:20px}.nav-caption{margin-top:22px;margin-bottom:8px}.nav-item{padding-top:8px;padding-bottom:8px}.goal-card{padding:14px}.sidebar-bottom{padding-top:14px}.user-row{margin-top:14px}}
.mobile-close{display:none;position:absolute;right:10px;top:14px;font-size:25px;line-height:1}@media(max-width:850px){.mobile-close{display:block}}@media(max-width:600px){.writing-grid{grid-template-columns:1fr}.writing-pad{padding:20px}.writing-pad canvas,.writing-pad svg{max-width:350px}.writing-pad .btn{padding:12px 16px;font-size:12px}}
.tabs{scrollbar-width:none}.tabs::-webkit-scrollbar{display:none}

/* Compact studio attribution, matching the reference without a badge. */
.site-footer{position:relative;display:flex;align-items:center;justify-content:space-between;gap:16px 28px;padding:22px 42px;background:var(--bg2);font-size:12px;letter-spacing:0;flex-wrap:wrap}
.site-footer::before{content:'';position:absolute;inset:-1px 0 auto;height:1px;background:linear-gradient(90deg,transparent,rgba(123,108,255,.22),transparent);pointer-events:none}
.footer-product{display:flex;align-items:center;min-width:0}
.footer-product-name{color:var(--muted);font-size:11px;font-weight:500;letter-spacing:.025em}
.site-footer .footer-sources{width:auto;margin:0 auto 0 0;color:var(--muted);font-size:11px;line-height:1.5;text-align:left;text-decoration:none;transition:color .15s}
.site-footer .footer-sources:hover{color:var(--ink-dim)}
.site-footer .studio-signature{display:inline-flex;align-items:center;gap:10px;width:auto;margin:0;padding:8px 0;border:0;border-radius:5px;background:none;box-shadow:none;text-align:left;white-space:nowrap;flex-shrink:0}
.studio-signature-mark{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:22px;height:22px;border:0;border-radius:0;background:none;box-shadow:none}
.studio-signature-mark img{display:block;object-fit:contain}
.studio-signature-copy{display:inline-flex;align-items:baseline;gap:5px;line-height:1.5}
.studio-signature-label{font-size:11px;color:var(--muted);font-weight:400}
.studio-signature-name{color:var(--ink);font-family:var(--display);font-size:13px;letter-spacing:-.015em;font-weight:650;text-decoration:underline;text-decoration-color:transparent;text-underline-offset:5px;transition:color .15s,text-decoration-color .15s}
.studio-signature:hover .studio-signature-name{color:#c3baff;text-decoration-color:var(--violet)}
@media(max-width:1150px){.site-footer{padding:22px 26px;gap:12px 20px}}
@media(max-width:700px){.site-footer{padding:20px;gap:12px 18px}.site-footer .studio-signature{width:100%;justify-content:center;order:3}.footer-product{margin-right:auto}.site-footer .footer-sources{margin:0;font-size:10px}.studio-signature-label{font-size:10px}.studio-signature-name{font-size:12px}}
@media(prefers-reduced-motion:reduce){.studio-signature-name,.site-footer .footer-sources{transition:none}}

/* One select treatment across account, study, owner and language controls. */
select:not([multiple]){
  appearance:none;
  min-height:46px;
  padding:12px 42px 12px 15px;
  border:1px solid #333947;
  border-radius:12px;
  color:var(--ink);
  background-color:#151922;
  background-image:linear-gradient(45deg,transparent 50%,#ada5d5 50%),linear-gradient(135deg,#ada5d5 50%,transparent 50%);
  background-position:calc(100% - 20px) 50%,calc(100% - 15px) 50%;
  background-size:5px 5px;
  background-repeat:no-repeat;
  cursor:pointer;
  transition:border-color .15s,box-shadow .15s,background-color .15s;
}
select:not([multiple]):hover{border-color:#69608f;background-color:#1a1e29}
select:not([multiple]):focus-visible{border-color:var(--violet);outline:2px solid #b4aaff;outline-offset:3px;box-shadow:0 0 0 4px #7b6cff15}
select:disabled{cursor:not-allowed;opacity:.5}
select option{background:#181c26;color:var(--ink)}
.language-form select:not([multiple]){min-height:32px;width:66px;padding:6px 25px 6px 9px;border:1px solid var(--line2);border-radius:8px;background-position:calc(100% - 14px) 50%,calc(100% - 9px) 50%;font-size:11px}
@supports(appearance:base-select){
  select:not([multiple]),select:not([multiple])::picker(select){appearance:base-select}
  select:not([multiple]){background-image:none;padding-right:15px;gap:14px}
  select:not([multiple])::picker-icon{color:#ada5d5;transition:rotate .18s}
  select:not([multiple]):open::picker-icon{rotate:180deg}
  select:not([multiple])::picker(select){
    margin-top:8px;
    padding:6px;
    min-width:anchor-size(width);
    max-height:min(340px,60vh);
    overflow-y:auto;
    border:1px solid #45405d;
    border-radius:14px;
    background:#181c26;
    color:var(--ink);
    box-shadow:0 18px 50px #0008,0 2px 8px #0004;
    scrollbar-width:thin;
    scrollbar-color:#56506f transparent;
  }
  select:not([multiple]) option{display:flex;align-items:center;gap:12px;min-height:44px;padding:10px 12px;border-radius:8px;line-height:1.4;font-size:14px;background:transparent;cursor:pointer}
  select:not([multiple]) option+option{margin-top:3px}
  select:not([multiple]) option:hover,select:not([multiple]) option:focus-visible{background:#7b6cff1c;outline:none}
  select:not([multiple]) option:checked{background:linear-gradient(100deg,#7b6cff33,#7b6cff12);color:#e3ddff;font-weight:600}
  select:not([multiple]) option::checkmark{color:#c2b8ff;order:2;margin-left:auto}
  select:not([multiple]) option:disabled{opacity:.45;cursor:not-allowed}
  .language-form select:not([multiple]){padding-right:9px;gap:8px}
}
@media(prefers-reduced-motion:reduce){select:not([multiple]),select:not([multiple])::picker-icon{transition:none}}

.today-time{margin-bottom:22px;padding:20px 24px}.today-time form{display:flex;align-items:flex-end;gap:14px;flex-wrap:wrap}.today-time .form-field{margin-bottom:0}.today-time input{width:140px;min-height:42px}.today-time p{margin:12px 0 0;font-size:12px}.today-time .errorlist{margin:8px 0 0}
/* Grammar and reading practice shares the lesson visual language. */
.practice-passage{font-family:var(--font-zh, sans-serif);font-size:clamp(1.25rem,3vw,1.75rem);line-height:1.65;letter-spacing:.03em;overflow-wrap:anywhere;background:rgba(139,117,239,.07);border-left:3px solid #8875dc;padding:16px 20px;border-radius:0 12px 12px 0}
#practice-questions .quiz-question{min-inline-size:0;border:0;border-top:1px solid rgba(151,146,174,.18);padding:24px 0;margin-top:24px}
#practice-questions legend{font-weight:650;line-height:1.6;max-width:100%;padding:0 8px 0 0}
#practice-questions .quiz-options span{font-size:1.15rem;overflow-wrap:anywhere}
.practice-feedback{padding:18px 0;border-top:1px solid rgba(151,146,174,.18)}
.practice-feedback h3{font-size:1rem;line-height:1.6;margin:0 0 12px}
.practice-feedback p{line-height:1.7;overflow-wrap:anywhere}
.practice-answer{font-size:1.4rem;font-weight:650}
.skill-summary{display:flex;flex-wrap:wrap;gap:12px 24px;margin:18px 0;color:#b6aecb}
.practice-history{margin-top:24px}
.practice-history-item{border-top:1px solid rgba(151,146,174,.18);padding:16px 0}
.practice-history-item summary{display:flex;justify-content:space-between;align-items:center;gap:20px;cursor:pointer;line-height:1.5;list-style:none}
.practice-history-item summary::after{content:'+';color:#a799e1;font-size:1.4rem}
.practice-history-item[open] summary::after{content:'−'}
.practice-history-item summary span{flex:1}
.practice-history-item summary:focus-visible{outline:2px solid #a799e1;outline-offset:5px;border-radius:4px}
@media(max-width:600px){.lesson-heading{flex-direction:column;gap:12px}.lesson-heading>div{min-width:0;max-width:100%}.lesson-heading>.chip{max-width:100%;white-space:normal}.practice-history-item summary{gap:10px}.practice-history-item summary span{min-width:0;overflow-wrap:anywhere}}
/* Original Chimera Hanzi icon set: one grid and one stroke weight. */
.icon-sprite{position:absolute;width:0;height:0;overflow:hidden;pointer-events:none}
.icon{width:22px;height:22px;display:inline-block;vertical-align:middle;flex-shrink:0}
.nav-item{position:relative;gap:12px;padding:9px 11px;border-radius:12px}
.nav-item>.nav-icon{width:34px;height:34px;display:grid;place-items:center;flex-shrink:0;border-radius:10px;color:#9299af;background:rgba(142,149,176,.055);transition:color .16s,background .16s}
.nav-icon .icon{width:21px;height:21px}
.nav-item:hover>.nav-icon{color:var(--ink);background:rgba(142,149,176,.12)}
.nav-item.selected{background:linear-gradient(100deg,rgba(123,108,255,.15),rgba(123,108,255,.04));border-color:rgba(123,108,255,.2)}
.nav-item.selected>.nav-icon{color:#b1a5ff;background:rgba(123,108,255,.16);box-shadow:inset 0 0 0 1px rgba(154,135,255,.15)}
.nav-item.selected::after{content:'';position:absolute;right:10px;width:4px;height:18px;border-radius:3px;background:#9b8bff}
.nav-item.selected>small{margin-right:12px}
.goal-card>a{display:inline-flex;align-items:center;gap:7px}
.goal-card>a .icon{width:15px;height:15px}
.icon-btn .icon{width:20px;height:20px}
.user-row .icon-btn{display:grid;place-items:center;width:34px;height:34px}
.feature-icon{display:grid;place-items:center}
.feature-icon .icon{width:24px;height:24px}
.big-symbol .icon{width:48px;height:48px}
.btn .icon{width:18px;height:18px;margin-right:7px}
.chinese .icon-btn .icon{width:23px;height:23px}
.lock-symbol .icon{width:20px;height:20px;color:var(--muted)}
@media(prefers-reduced-motion:reduce){.nav-item>.nav-icon{transition:none}}
.diagnostic-invite{display:flex;align-items:center;gap:18px;margin:0 0 20px;padding:20px 24px}
.diagnostic-invite .feature-icon{margin:0;flex-shrink:0}
.diagnostic-invite>div{flex:1;min-width:0}
.diagnostic-invite h2{font-size:18px;margin:0 0 5px}
.diagnostic-invite p{font-size:13px;margin:0;max-width:650px}
.diagnostic-invite .btn{flex-shrink:0}
.baseline-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:28px 0}
.baseline-grid article{padding:22px;border:1px solid var(--line);border-radius:14px;background:rgba(123,108,255,.035)}
.baseline-grid h3{font-size:16px;margin:14px 0 10px}
.baseline-grid strong{display:block;font-size:32px;font-weight:600;letter-spacing:-.04em}
.baseline-grid small{display:block;margin-top:4px}
.baseline-grid .feature-icon{margin:0}
.diagnostic-feedback{margin-top:24px;border-top:1px solid var(--line);padding-top:18px}
.diagnostic-feedback summary{cursor:pointer;color:var(--ink-dim);font-weight:550;padding:8px 0}
.diagnostic-feedback summary:focus-visible{outline:2px solid var(--cyan);outline-offset:4px}
.diagnostic-topics{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:24px}
.diagnostic-check{margin-top:24px}
.assessment-heading{display:flex;align-items:flex-start;gap:18px}
.assessment-heading .feature-icon{flex-shrink:0}
.assessment-heading>div{min-width:0}
.diagnostic-next{margin-top:24px;align-items:center}
@media(max-width:600px){.diagnostic-invite{align-items:flex-start;flex-wrap:wrap;padding:20px;gap:14px}.diagnostic-invite>div{min-width:180px}.diagnostic-invite .btn{width:100%}.baseline-grid{gap:10px}.baseline-grid article{padding:14px 10px}.baseline-grid h3{font-size:12px;letter-spacing:0}.baseline-grid strong{font-size:26px}.baseline-grid .feature-icon{width:30px;height:30px}.baseline-grid small{font-size:10px}.assessment-heading{gap:12px}.diagnostic-summary>.section-heading{flex-wrap:wrap;gap:12px}.diagnostic-next{flex-direction:column;align-items:stretch}}
.sidebar{overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin}
.sidebar>.brand,.sidebar nav,.sidebar-bottom{flex-shrink:0}
.diagnostic-summary{margin:24px 0}
/* Original sample practice: paper and a compact, revisioned answer sheet. */
.mock-feature{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:32px;margin-bottom:24px;border-color:#5b4b85;background:linear-gradient(115deg,#211b34,#15151d 70%)}
.mock-feature h2{font-size:30px;margin:12px 0}.mock-feature p{max-width:630px}.mock-start{align-self:center}.mock-start small{display:block;margin-top:12px;color:var(--muted);line-height:1.5}
.mock-facts{display:flex;flex-wrap:wrap;gap:20px;margin-top:22px;font-size:14px;color:#c9bfdf}.mock-facts span{display:flex;align-items:center;gap:8px}.mock-facts .ui-icon{width:20px;height:20px}
.mock-history{margin:24px 0}.mock-history small{display:block;color:var(--muted);margin-top:5px}.mock-clock{padding:14px 22px;border:1px solid #4a3b68;border-radius:18px;min-width:140px;background:#211b34}.mock-clock small{display:block;color:#c9bfdf}.mock-clock strong{display:block;font-size:32px;font-variant-numeric:tabular-nums;margin-top:6px}
.mock-save-status{margin:0 0 16px;color:var(--muted);font-size:14px}.mock-actions{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}.mock-actions:has(>button[hidden]):not(:has(>button:not([hidden]))){display:none}
.mock-audio{display:grid;grid-template-columns:minmax(0,1fr) minmax(200px,360px);gap:24px;align-items:center;margin-bottom:24px}.mock-audio audio{width:100%;max-width:100%}.mock-audio p{font-size:13px;margin-bottom:0}.mock-audio h2{margin:8px 0}
.mock-layout{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(310px,1fr);gap:24px;align-items:start}.mock-layout .panel{min-width:0}.mock-paper iframe{display:block;width:100%;height:760px;border:0;border-radius:12px;background:#fff}.mock-paper .muted,.mock-sheet .muted{font-size:12px;line-height:1.6}.mock-paper .section-heading{gap:12px;flex-wrap:wrap}.mock-sheet h3{margin:26px 0 12px;font-size:15px}.mock-sheet h3:first-child{margin-top:10px}
.mock-question{display:flex;gap:8px;align-items:center;border:0;border-bottom:1px solid #252530;padding:10px 0;margin:0;min-width:0}.mock-question legend{float:left;width:26px;padding:9px 0;font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}.mock-choice{display:block;position:relative;flex:1;max-width:42px;height:38px;cursor:pointer;margin:0}.mock-choice input{position:absolute;opacity:0;width:100%;height:100%;margin:0}.mock-choice span{display:grid;place-items:center;height:100%;border:1px solid #343340;border-radius:9px;background:#17171f;font-size:13px;transition:background .12s,border-color .12s}.mock-choice input:checked+span{border-color:#a78bfa;background:#513d78;color:#fff}.mock-choice input:focus-visible+span{outline:2px solid #8af2de;outline-offset:2px}.mock-choice:has(input:disabled){cursor:default;opacity:.6}.mock-question.unsaved{border-bottom-color:#e8b868}.mock-sheet .btn{margin-top:24px}.mock-feedback{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:10px}.mock-feedback-item{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px;border-radius:10px;background:#17171f;border:1px solid #343340;font-size:13px}.mock-feedback-item.right{border-color:#32665b}.mock-feedback-item.wrong{border-color:#7b493e}.mock-result-panel{margin-bottom:24px}.mock-result-count{font-size:40px;margin:12px 0}.mock-result-panel p{color:var(--muted)}
@media(max-width:1100px){.mock-layout{grid-template-columns:1fr}.mock-paper iframe{height:560px}.mock-sheet{max-width:none}.mock-question{max-width:440px}.mock-audio{grid-template-columns:1fr}}
@media(max-width:600px){.mock-feature{grid-template-columns:1fr;gap:20px}.mock-feature h2{font-size:25px}.mock-clock{width:100%;margin-top:12px;padding:12px 16px;display:flex;align-items:center;justify-content:space-between}.mock-clock strong{margin:0;font-size:26px}.mock-paper iframe{height:420px}.mock-facts{gap:14px}.mock-question{gap:6px}.mock-choice{height:40px}.mock-feedback{grid-template-columns:repeat(3,minmax(0,1fr))}.mock-feedback-item{padding:10px;gap:5px}.mock-layout{gap:18px}}

.mock-page-label{font-size:13px;color:var(--muted);display:block;margin-bottom:8px}.mock-page-select{width:100%;margin-bottom:18px}.mock-page-view{max-height:800px;overflow:auto;border-radius:12px;background:#fff}.mock-page-view img{display:block;width:100%;height:auto}.mock-paper{position:sticky;top:20px}
@media(max-width:1100px){.mock-paper{position:static}.mock-page-view{max-height:640px}}
@media(max-width:600px){.mock-page-view{max-height:520px}}

.mock-toolbar{position:sticky;top:0;z-index:5;display:flex;justify-content:space-between;align-items:center;gap:16px;margin:0 0 20px;padding:12px 0;background:#101116;border-bottom:1px solid #343340}.mock-toolbar>div:first-child{min-width:0}.mock-toolbar .mock-save-status{margin:0}.mock-toolbar .mock-actions{margin:8px 0 0}.mock-toolbar .mock-clock{display:flex;gap:18px;align-items:center;padding:8px 14px}.mock-toolbar .mock-clock strong{margin:0;font-size:26px}.mock-toolbar .mock-clock small{max-width:170px}.mock-choice{max-width:44px;height:44px}
@media(max-width:600px){.mock-toolbar{gap:8px}.mock-toolbar .mock-clock{width:auto;min-width:130px;margin:0;display:block;text-align:right;background:none;border:0;padding:0}.mock-toolbar .mock-clock small{font-size:11px}.mock-toolbar .mock-clock strong{font-size:23px}.mock-toolbar .mock-save-status{font-size:12px}.mock-toolbar .mock-actions .btn{font-size:11px;padding:8px}.mock-choice{height:44px}.mock-toolbar .mock-actions{max-width:180px}}

.mock-confirm{max-width:460px;width:calc(100% - 40px);padding:28px;background:#1b1b28;color:#f1edf7;border:1px solid #655081;border-radius:20px;box-shadow:0 24px 100px #0009}.mock-confirm::backdrop{background:#06060bd9;backdrop-filter:blur(5px)}.mock-confirm h2{margin:0 0 16px;font-size:23px}.mock-confirm p{color:#bdb6cc;line-height:1.6}.mock-confirm-actions{display:flex;justify-content:flex-end;flex-wrap:wrap;gap:12px;margin-top:24px}

#mock-result{scroll-margin-top:110px}

/* Short scenes share the dark lesson palette; translations start hidden. */
.lesson-dialogue{margin:20px 0 26px;padding-top:24px;border-top:1px solid var(--line)}
.lesson-dialogue h2{font-size:22px;margin-bottom:12px}
.dialogue-note{font-size:13px;line-height:1.7;margin-bottom:16px}
.dialogue-controls{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:20px}
.dialogue-controls [aria-pressed="true"]{border-color:var(--violet);background:var(--grad-soft);color:var(--ink)}
.dialogue-lines{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:16px}
.dialogue-turn{width:92%;padding:18px 20px;border:1px solid var(--line2);border-radius:16px;background:var(--bg2);min-width:0;overflow-wrap:anywhere}
.dialogue-role-a{align-self:flex-start;border-bottom-left-radius:4px}
.dialogue-role-b{align-self:flex-end;border-bottom-right-radius:4px;background:var(--grad-soft);border-color:#7b6cff45}
.dialogue-turn-heading{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;margin-bottom:10px}
.dialogue-role-label{font-size:12px;color:var(--ink-dim)}
.dialogue-turn .dialogue-speak{font-size:11px;margin:0;padding:7px 10px;min-height:36px}
.dialogue-turn .dialogue-chinese{font-family:'Noto Sans CJK SC',system-ui,sans-serif;font-size:clamp(20px,3vw,26px);line-height:1.65;color:var(--ink);margin:0}
.dialogue-turn .dialogue-pinyin{font-size:14px;line-height:1.65;margin:8px 0 0}
.dialogue-turn .dialogue-translation{font-size:13px;line-height:1.7;margin:8px 0 0}
.lesson-dialogue>small{display:block;margin-top:16px;line-height:1.7}
.quiz-context,.card-context{font-family:'Noto Sans CJK SC',system-ui,sans-serif;font-size:clamp(18px,3vw,24px);line-height:1.65;overflow-wrap:anywhere;color:var(--ink-dim)}
.quiz-context{padding:14px 18px;background:var(--bg2);border-left:3px solid var(--violet);border-radius:0 10px 10px 0}
@media(max-width:600px){.dialogue-turn{width:96%;padding:14px}.dialogue-turn-heading{align-items:flex-start}.dialogue-controls .btn{min-height:44px}.dialogue-turn .dialogue-speak{min-height:44px}.quiz-context{padding:12px}}

.student-actions{display:flex;gap:10px;flex-wrap:wrap}.reject-access{color:#f7a6ae;border-color:#683841}.reject-access:hover{background:#38232a}.chip.rejected{color:#f7a6ae;border-color:#683841}@media(max-width:600px){.student-actions{width:100%}.student-actions .btn{min-height:44px}}