/* ============================================================
     THEME TOKENS — light is the default brand presentation;
     [data-theme="dark"] overrides the same variable names.
     ============================================================ */
  :root{
    --bg-light:#EBE0BC;
    --bg-dark:#1A191F;
    --bg:#FFFFFF;
    --frame:#F5F5F3;
    --card:#FFFFFF;
    --text:#000000;
    --text-dim:#453f30;
    --shadow:0 10px 24px rgba(30,26,10,0.18);
    --shadow-sm:0 6px 14px rgba(30,26,10,0.14);
    --heart:#c9372a;
    --danger:#a8402f;
    --danger-bg:#f4ded9;
    --success:#3f7a52;
    --success-bg:#dfeadf;
    --accent:#8a6d2f;
    --accent-bg:#efe6c8;
    --glass:rgba(255,255,255,0.14);
    --radius-lg:28px;
    --radius-sm:8px;
    --font-serif:'Baskerville Old Face', Baskerville, 'Libre Baskerville', 'Times New Roman', serif;
    --font-sans:Helvetica, Arial, 'Helvetica Neue', sans-serif;
    color-scheme: light;
  }
  [data-theme="dark"]{
    --bg:#1A191F;
    --frame:#242330;
    --card:#2E2C3B;
    --text:#FFFFFF;
    --text-dim:#b3aec2;
    --shadow:0 10px 24px rgba(0,0,0,0.5);
    --shadow-sm:0 6px 14px rgba(0,0,0,0.4);
    --heart:#e2564a;
    --danger:#d9695c;
    --danger-bg:#3a2725;
    --success:#6bbb8a;
    --success-bg:#20332a;
    --accent:#c9a24b;
    --accent-bg:#33301f;
    --glass:rgba(255,255,255,0.05);
    color-scheme: dark;
  }

  *{box-sizing:border-box;}
  html,body{height:100%;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--text);
    font-family:var(--font-sans);
    display:flex;
    justify-content:center;
    min-height:100vh;
    transition:background-color .2s ease, color .2s ease;
  }
  .app{ width:100%; max-width:1080px; padding:0 40px; min-height:100vh; display:flex; flex-direction:column; }
  @media (max-width:640px){ .app{ padding:0 20px; } }

  /* ---------- scrolling background art grid (landing only) ---------- */
  .bg-grid{
    position:fixed; inset:0; z-index:-2;
    display:flex; gap:3px; overflow:hidden;
    opacity:0; pointer-events:none; transition:opacity .4s ease;
  }
  .bg-grid.show{ opacity:1; }
  .bg-col{ flex:1; position:relative; overflow:hidden; contain:layout paint; }
  .bg-col-track{ display:flex; flex-direction:column; gap:3px; will-change:transform; }
  .bg-col-track img{ width:100%; aspect-ratio:1; object-fit:cover; display:block; }
  @keyframes bgScroll{ from{ transform:translateY(0); } to{ transform:translateY(-50%); } }
  .bg-overlay{
    position:fixed; inset:0; z-index:-1;
    background:var(--bg); opacity:0; transition:opacity .4s ease;
    pointer-events:none;
  }
  .bg-overlay.show{ opacity:0.68; }
  [data-theme="dark"] .bg-overlay.show{ opacity:0.86; }

  /* ---------- static gallery wall (every page except home) ---------- */
  .static-wall{
    position:fixed; inset:0; z-index:-3;
    background-color:var(--bg);
    opacity:0; transition:opacity .4s ease;
    pointer-events:none;
  }
  .static-wall.show{ opacity:1; }

  /* ---------- header ---------- */
  .masthead{
    display:flex;
    align-items:center;
    justify-content:flex-start;
    padding:20px 0;
    gap:14px;
    flex:none;
  }
  .masthead-left{ display:flex; align-items:center; gap:12px; }
  .masthead-left.hidden{ display:none; }
  .masthead-right{ display:flex; align-items:center; gap:10px; margin-left:auto; }

  .logo-mark{
    font-family:var(--font-serif);
    font-size:22px;
    color:var(--bg-dark);
    margin:0;
    cursor:pointer;
    line-height:1;
  }
  [data-theme="dark"] .logo-mark{ color:var(--bg-light); }

  .icon-btn{
    width:36px; height:36px; flex:none;
    display:flex; align-items:center; justify-content:center;
    border-radius:50%; border:none;
    background:var(--frame); color:var(--text);
    box-shadow:none; cursor:pointer;
    transition:box-shadow .15s ease, transform .15s ease;
  }
  .icon-btn:hover{ box-shadow:var(--shadow-sm); transform:translateY(-1px); }
  .icon-btn svg{ width:16px; height:16px; }

  /* ---------- main content column ---------- */
  #screen{ flex:1 0 auto; }
  .stage-wrap{ padding-top:44px; }

  /* ---------- generic buttons ---------- */
  .btn{
    position:relative;
    font-family:var(--font-sans); font-weight:700; font-size:23px;
    padding:12px 0;
    border:none;
    background:none;
    box-shadow:none;
    cursor:pointer;
    z-index:1;
  }
  .btn::before{
    content:'';
    position:absolute;
    inset:-10px -20px;
    border-radius:10px;
    background:transparent;
    box-shadow:none;
    transition:background .2s ease, box-shadow .2s ease;
    z-index:-1;
    pointer-events:none;
  }
  .btn:hover::before{
    background:var(--glass);
    box-shadow:var(--shadow-sm);
  }
  .btn-primary{ color:var(--text); }
  .btn-ghost{ color:var(--text-dim); }

  /* ---------- landing hero ---------- */
  .hero{ min-height:74vh; display:flex; flex-direction:column; justify-content:center; align-items:center; text-align:center; padding:20px 4px; position:relative; z-index:1; }
  .hero-title{
    font-family:var(--font-serif); font-weight:700;
    font-size:clamp(70px,20vw,190px); line-height:0.95; margin:0 0 26px;
  }
  .hero-lede{ font-size:clamp(20px,3.8vw,29px); color:var(--text); margin:0 0 50px; }
  .hero-actions{ display:flex; gap:64px; flex-wrap:wrap; justify-content:center; }
  .hero-actions .btn{ min-width:110px; text-align:center; }
  .dev-link{
    position:fixed; right:18px; bottom:14px; z-index:5;
    background:none; border:none; cursor:pointer;
    font-family:var(--font-sans); font-size:11px; color:var(--text-dim);
    opacity:0.4;
  }
  .dev-link:hover{ opacity:1; }

  /* ---------- stage (modes / rules / login) ---------- */
  .stage-title{
    font-family:var(--font-sans); font-weight:700;
    font-size:clamp(64px,12vw,90px); margin:0 0 34px;
  }
  .stage-actions{ display:flex; justify-content:flex-start; gap:14px; align-items:center; margin-top:30px; }
  .rules-actions{ display:flex; justify-content:space-between; align-items:center; margin-top:30px; }
  .stage-body{ font-size:15px; color:var(--text-dim); line-height:1.6; margin:0 0 30px; max-width:48ch; }

  /* ---------- learn: heading + portrait ---------- */
  .learn-heading{ display:flex; align-items:center; gap:20px; margin-bottom:8px; }
  .learn-detail-title{ margin:0; font-size:clamp(44px,8vw,64px); }
  .learn-meta{ font-size:14px; color:var(--text-dim); margin:4px 0 0; }
  .learn-portrait-lg{
    flex:none; width:84px; height:84px; border-radius:50%; overflow:hidden;
    background:var(--card); box-shadow:var(--shadow-sm);
  }
  .learn-portrait-lg img{ width:100%; height:100%; object-fit:cover; display:block; }

  /* ---------- learn: two-column detail layout ---------- */
  .learn-detail-grid{
    display:grid; grid-template-columns:1.4fr 1fr; gap:48px;
    align-items:start; margin-top:34px;
  }
  @media (max-width:820px){ .learn-detail-grid{ grid-template-columns:1fr; } }

  .writeup{ max-width:66ch; }
  .writeup p{ font-size:16px; line-height:1.75; color:var(--text); margin:0 0 20px; }
  .writeup strong{ font-weight:700; }
  .writeup em{ font-style:italic; }

  /* clickable inline mentions of other artists/movements/subjects, or
     of a referenced artwork (which scrolls to/highlights its card) */
  .learn-ref{
    background:none; border:none; padding:0; margin:0; cursor:pointer;
    font:inherit; color:inherit; font-weight:700;
    text-decoration:underline; text-decoration-color:var(--text-dim); text-underline-offset:2px;
  }
  .learn-ref:hover{ text-decoration-color:var(--text); }
  .learn-ref-art{ font-weight:400; font-style:italic; }

  .examples-col{
    display:flex; flex-direction:column; gap:22px;
    position:sticky; top:24px;
  }
  .example-card{
    display:block; text-decoration:none; color:inherit;
    background:var(--card); border-radius:10px; overflow:hidden;
    box-shadow:var(--shadow-sm);
    transition:transform .15s ease, box-shadow .15s ease, outline-color .3s ease;
    outline:3px solid transparent; outline-offset:2px;
  }
  .example-card:hover{ transform:translateY(-3px); box-shadow:var(--shadow); }
  .example-card.flash{ outline-color:var(--accent); }
  .example-card img{ width:100%; aspect-ratio:4/3; object-fit:cover; display:block; background:#111; }
  .example-cap{ display:block; padding:14px 16px 16px; }
  .example-title{ display:block; font-weight:700; font-size:15px; font-style:italic; margin:0 0 3px; }
  .example-meta{ display:block; font-size:12.5px; color:var(--text-dim); }

  /* ---------- learn: portraits in list screens ---------- */
  .mode-main-portrait{ display:flex; flex-direction:row; align-items:center; gap:14px; }
  .mode-portrait{
    flex:none; width:44px; height:44px; border-radius:50%; overflow:hidden;
    background:var(--frame);
  }
  .mode-portrait img{ width:100%; height:100%; object-fit:cover; display:block; }
  .mode-text{ display:flex; flex-direction:column; }

  /* quiz UI — not currently rendered anywhere, kept for a possible
     later per-topic quiz feature */
  .quiz-block{ max-width:68ch; margin:8px 0 8px; padding-top:24px; border-top:1px solid var(--text-dim); }
  .quiz-label{ font-family:var(--font-sans); font-weight:700; font-size:12px; letter-spacing:1px; text-transform:uppercase; color:var(--text-dim); margin-bottom:18px; }
  .quiz-q{ margin-bottom:26px; }
  .quiz-question{ font-size:15.5px; font-weight:700; margin:0 0 12px; line-height:1.5; }
  .quiz-options{ display:flex; flex-direction:column; gap:8px; }
  .quiz-option{
    text-align:left; font-family:var(--font-sans); font-size:14.5px; color:var(--text);
    background:var(--card); border:1.5px solid var(--text-dim); border-radius:8px;
    padding:11px 14px; cursor:pointer;
    transition:border-color .12s ease, background .12s ease;
  }
  .quiz-option:hover:not(:disabled){ border-color:var(--text-dim); }
  .quiz-option:disabled{ cursor:default; }
  .quiz-option.correct{ border-color:var(--success); background:var(--success-bg); color:var(--success); font-weight:700; }
  .quiz-option.incorrect{ border-color:var(--danger); background:var(--danger-bg); color:var(--danger); }

  .spotlight-page{
    position:relative;
    min-height:calc(100vh - 90px);
    padding-bottom:24px;
    display:flex; flex-direction:column;
  }
  .spotlight-title{ position:relative; margin:0 0 22px; flex:none; }

  .spotlight-body{ position:relative; display:flex; flex-direction:column; align-items:center; flex:1; justify-content:center; min-height:0; }

  .daily-section{
    display:flex; flex-direction:row; align-items:flex-end; justify-content:center;
    gap:18px; flex-wrap:wrap; max-width:100%;
  }

  .daily-frame{
    display:inline-block;
    padding:12px;
    background:#7a4f30;
    border-radius:2px;
    box-shadow:0 18px 34px rgba(0,0,0,0.28);
    animation:frameDown .6s cubic-bezier(.2,.8,.3,1) both;
    animation-delay:.08s;
    flex:none;
  }
  .daily-frame img{
    display:block;
    width:auto; height:auto;
    max-width:min(56vw, 420px);
    max-height:40vh;
  }

  .daily-label{
    background:#ffffff;
    color:#1a1a1a;
    padding:14px 18px;
    width:220px;
    flex:none;
    text-align:left;
    box-shadow:0 8px 20px rgba(0,0,0,0.18);
    opacity:0;
    animation:labelIn .5s ease-out both;
    animation-delay:.5s;
  }

  .spotlight-links{
    display:flex; flex-wrap:wrap; justify-content:center; gap:9px;
    margin-top:20px; max-width:560px; flex:none;
    opacity:0;
    animation:labelIn .5s ease-out both;
    animation-delay:.62s;
  }
  .spotlight-link{
    background:#ffffff; color:#1a1a1a;
    font-family:var(--font-sans); font-weight:700; font-size:13px;
    padding:9px 16px; border-radius:9px;
    box-shadow:0 6px 14px rgba(0,0,0,0.14);
    text-decoration:none;
    transition:transform .15s ease, box-shadow .15s ease;
  }
  .spotlight-link:hover{ transform:translateY(-2px); box-shadow:0 10px 20px rgba(0,0,0,0.18); }

  .related-section{ position:relative; max-width:900px; margin:64px auto 0; }
  .related-title{ font-family:var(--font-sans); font-weight:700; font-size:22px; margin:0 0 20px; text-align:left; }

  .mini-grid{ display:grid; grid-template-columns:repeat(auto-fill, minmax(130px, 1fr)); gap:14px; }
  .mini-card{
    display:block; text-decoration:none; color:inherit;
    background:var(--card); border-radius:8px; overflow:hidden;
    box-shadow:var(--shadow-sm);
    transition:transform .15s ease, box-shadow .15s ease;
  }
  .mini-card:hover{ transform:translateY(-3px); box-shadow:var(--shadow); }
  .mini-card img{ width:100%; aspect-ratio:1; object-fit:cover; display:block; background:#111; }
  .mini-meta{ display:block; padding:8px 10px 10px; }
  .mini-artist{ display:block; font-weight:700; font-size:12px; margin:0 0 2px; }
  .mini-era{ display:block; font-size:11px; color:var(--text-dim); }
  .mini-title{ display:block; font-style:italic; font-size:11px; color:var(--text-dim); margin:2px 0; }
  .mini-medium{ display:block; font-size:10px; color:var(--text-dim); }

  .dev-group{ margin-bottom:44px; }
  .dev-group-title{ font-family:var(--font-sans); font-weight:700; font-size:20px; margin:0 0 4px; }
  .dev-count{ font-family:var(--font-sans); font-weight:400; font-size:13px; color:var(--text-dim); }
  .dev-empty{ font-size:13px; color:var(--danger); margin:10px 0 0; }
  .dev-loading{ font-size:13px; color:var(--text-dim); }

  @keyframes frameDown{ from{ transform:translateY(-34px); opacity:0; } to{ transform:translateY(0); opacity:1; } }
  @keyframes labelIn{ from{ opacity:0; transform:translateY(8px); } to{ opacity:1; transform:translateY(0); } }

  .mode-list{ display:flex; flex-direction:column; gap:6px; }
  .mode-item{
    display:flex; align-items:center; justify-content:space-between; gap:12px;
    text-align:left; background:none; border:none;
    padding:22px 0;
    font-family:var(--font-sans); color:var(--text);
    cursor:pointer;
  }
  .mode-item:disabled{ cursor:default; }
  .mode-main{ display:flex; flex-direction:column; gap:4px; }
  .mode-name{ font-weight:700; font-size:28px; }
  .mode-item:disabled .mode-name{ color:var(--text-dim); }
  .mode-desc{ font-size:17px; font-weight:500; color:var(--text-dim); }
  .mode-tag{
    font-family:var(--font-sans); font-size:11px;
    color:var(--text-dim); border:1px solid var(--text-dim); border-radius:100px; padding:4px 10px; flex:none;
  }

  .rules-list{ margin:0 0 8px; padding:0; list-style:none; }
  .rules-list li{
    font-size:22px; color:var(--text); line-height:1.4;
    padding:6px 0;
  }

  /* ---------- loading ---------- */
  .loading{ display:flex; flex-direction:column; align-items:center; gap:16px; padding:80px 20px; text-align:center; }
  .spinner{
    width:32px; height:32px; border-radius:50%;
    border:3px solid rgba(0,0,0,0.12); border-top-color:var(--text);
    animation:spin 0.9s linear infinite;
  }
  [data-theme="dark"] .spinner{ border-color:rgba(255,255,255,0.15); border-top-color:var(--text); }
  @keyframes spin{ to{ transform:rotate(360deg); } }
  .loading p{ color:var(--text-dim); font-size:14px; }

  .countdown{ display:flex; align-items:center; justify-content:center; min-height:50vh; }
  .countdown span{
    font-family:var(--font-sans); font-weight:700;
    font-size:clamp(80px,20vw,160px); color:var(--text);
    animation:countPop 0.35s ease-out;
  }
  @keyframes countPop{ from{ opacity:0; transform:scale(0.85); } to{ opacity:1; transform:scale(1); } }

  .error-box{ color:var(--danger); font-size:14px; line-height:1.6; }

  /* ---------- frame ---------- */
  .frame{
    position:relative;
    display:flex; align-items:center; justify-content:center;
    background:var(--frame);
    border-radius:var(--radius-lg);
    box-shadow:var(--shadow);
    min-height:280px;
    padding:22px;
    overflow:hidden;
    margin-bottom:16px;
  }
  .frame img{
    display:block;
    max-width:100%;
    max-height:52vh;
    border-radius:6px;
    opacity:0;
    transform:translateY(24px) rotate(-2deg) scale(0.95);
  }
  .frame img.thrown{ animation:throwIn .5s cubic-bezier(.2,.9,.3,1.2) forwards; }
  @keyframes throwIn{
    0%{ opacity:0; transform:translateY(24px) rotate(-2deg) scale(0.95); }
    60%{ opacity:1; transform:translateY(-3px) rotate(1deg) scale(1.01); }
    100%{ opacity:1; transform:translateY(0) rotate(0deg) scale(1); }
  }
  @media (prefers-reduced-motion: reduce){ .frame img.thrown{ animation:none; opacity:1; transform:none; } }

  .badge{
    position:absolute; top:14px; right:14px;
    font-size:12px; font-weight:700;
    padding:6px 12px; border-radius:100px;
    opacity:0; transform:translateY(-6px);
    transition:opacity .2s, transform .2s;
    background:var(--card); box-shadow:var(--shadow-sm);
  }
  .badge.show{ opacity:1; transform:translateY(0); }
  .badge.full{ color:var(--success); }
  .badge.partial{ color:var(--accent); }
  .badge.miss{ color:var(--danger); }

  .round-timer{ position:absolute; top:0; left:0; right:0; height:5px; background:rgba(0,0,0,0.12); z-index:2; }
  [data-theme="dark"] .round-timer{ background:rgba(255,255,255,0.15); }
  .round-timer-bar{ height:100%; width:100%; background:var(--success); }
  .round-timer-bar.run{ animation:shrinkBar 5s linear forwards; }
  @keyframes shrinkBar{
    0%{ width:100%; background:var(--success); }
    60%{ background:var(--accent); }
    100%{ width:0%; background:var(--danger); }
  }

  .clock-wrap{ display:flex; align-items:baseline; gap:8px; }
  .master-clock{ font-size:20px; font-weight:700; font-variant-numeric:tabular-nums; color:var(--text); transition:color .3s; }
  .master-clock.warn{ color:var(--accent); }
  .master-clock.danger{ color:var(--danger); }
  .master-clock.flash{ animation:clockFlash 0.6s ease-in-out infinite; }
  @keyframes clockFlash{ 0%,100%{ opacity:1; } 50%{ opacity:0.35; } }
  .clock-delta{ font-size:13px; font-weight:700; opacity:0; }
  .clock-delta.show{ animation:deltaFade 1.3s ease-out forwards; }
  .clock-delta.full{ color:var(--success); }
  .clock-delta.miss{ color:var(--danger); }
  @keyframes deltaFade{
    0%{ opacity:0; transform:translateY(-3px); }
    15%{ opacity:1; transform:translateY(0); }
    75%{ opacity:1; }
    100%{ opacity:0; }
  }

  .choices-binary{ grid-template-columns:1fr; }

  /* ---------- CAPTCHA ---------- */
  .captcha-prompt{
    font-family:var(--font-sans); font-weight:700;
    font-size:clamp(22px,4vw,30px); color:var(--text); margin:0 0 20px; line-height:1.3;
  }
  .captcha-prompt b{ font-weight:700; }
  .captcha-wrap{ max-width:560px; margin:0 auto; text-align:center; }
  .captcha-meta{ display:flex; justify-content:space-between; align-items:center; margin-bottom:16px; font-size:16px; font-weight:600; color:var(--text-dim); }
  .captcha-grid{
    display:grid; grid-template-columns:repeat(3, 1fr); gap:8px;
    margin-bottom:6px;
  }
  .captcha-tile{
    position:relative; aspect-ratio:1; border:none; border-radius:6px;
    padding:0; overflow:hidden; cursor:pointer; background:var(--frame);
  }
  .captcha-tile img{
    width:100%; height:100%; object-fit:cover; display:block;
    filter:saturate(0.9) contrast(1.03);
    outline:2px solid rgba(0,0,0,0.15); outline-offset:-2px;
  }
  [data-theme="dark"] .captcha-tile img{ outline-color:rgba(255,255,255,0.15); }
  .captcha-tile::after{
    content:''; position:absolute; inset:0;
    background:rgba(0,0,0,0); transition:background .15s ease;
  }
  .captcha-tile:hover::after{ background:rgba(0,0,0,0.12); }
  .captcha-tile.locked{ pointer-events:none; }
  .captcha-mark{
    position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
    font-size:34px; font-weight:700; opacity:0; transition:opacity .1s ease;
  }
  .captcha-tile.flash-correct .captcha-mark{ opacity:1; color:var(--success); background:rgba(0,0,0,0.35); }
  .captcha-tile.flash-wrong .captcha-mark{ opacity:1; color:var(--danger); background:rgba(0,0,0,0.35); }

  .captcha-verify{ display:flex; flex-direction:column; align-items:center; gap:16px; min-height:50vh; justify-content:center; text-align:center; }
  .captcha-verify p{ color:var(--text-dim); font-size:14px; }

  /* ---------- stats row ---------- */
  .stats-row{ display:flex; align-items:center; justify-content:space-between; margin-bottom:18px; }
  .hearts-row{ display:flex; gap:3px; }
  .heart-slot{ position:relative; width:18px; height:16px; flex:none; }
  .heart-slot svg{ position:absolute; top:0; left:0; width:18px; height:16px; }
  .heart-front-wrap{ position:absolute; top:0; left:0; height:16px; overflow:hidden; }
  .score-label{ font-size:15px; color:var(--text); }

  /* ---------- choices ---------- */
  .choices{ display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-bottom:16px; }
  @media (max-width:520px){ .choices{ grid-template-columns:1fr; } }

  .choice{
    text-align:left;
    font-family:var(--font-sans);
    color:var(--text);
    background:var(--card);
    border:none;
    border-radius:var(--radius-sm);
    box-shadow:none;
    padding:16px 18px;
    cursor:pointer;
    display:flex; flex-direction:column; gap:4px;
    transition:box-shadow .15s ease, background .15s ease;
  }
  .choice:hover:not(:disabled){ box-shadow:var(--shadow-sm); }
  .choice-artist{ font-weight:700; font-size:15px; }
  .choice-era{ font-size:13px; color:var(--text-dim); }
  .choice.selected{ box-shadow:0 0 0 2px var(--text) inset; }
  .choice.opt-full{ background:var(--success-bg); }
  .choice.opt-partial{ background:var(--accent-bg); }
  .choice.opt-miss{ background:var(--danger-bg); }
  .choice:disabled{ cursor:default; }

  /* ---------- placard (reveal card) ---------- */
  .verdict-tag{ font-size:13px; font-weight:700; margin-bottom:10px; }
  .verdict-tag.full{ color:var(--success); }
  .verdict-tag.partial{ color:var(--accent); }
  .verdict-tag.miss{ color:var(--danger); }
  .placard-card{
    background:var(--card); border-radius:var(--radius-sm); box-shadow:var(--shadow-sm);
    padding:18px 20px; margin-bottom:14px;
  }
  .pc-artist{ font-weight:700; font-size:16px; margin:0 0 3px; }
  .pc-title{ font-style:italic; font-size:14.5px; margin:0 0 3px; }
  .pc-era{ font-size:14px; margin:0 0 3px; }
  .pc-medium{ font-size:13px; color:var(--text-dim); margin:0; }

  .learn-chips{ display:flex; flex-wrap:wrap; gap:7px; }
  .learn-chip{
    font-size:12.5px; font-weight:500;
    padding:7px 13px; border-radius:100px;
    background:var(--card); box-shadow:none;
    color:var(--text-dim); text-decoration:none;
    transition:box-shadow .15s ease;
  }
  .learn-chip:hover{ box-shadow:var(--shadow-sm); }

  /* ---------- review (post-game) ---------- */
  .review-list{ display:flex; flex-direction:column; gap:22px; margin-bottom:12px; }
  .review-item{ display:flex; gap:16px; align-items:flex-start; }
  .review-thumb{
    width:72px; height:72px; flex:none; object-fit:cover;
    border-radius:6px; box-shadow:var(--shadow-sm);
  }
  .review-body{ flex:1; min-width:0; }
  .review-body .placard-card{ margin-bottom:10px; }
  @media (max-width:520px){
    .review-item{ flex-direction:column; }
    .review-thumb{ width:100%; height:auto; max-height:180px; }
  }

  /* ---------- game over ---------- */
  .end-wrap{ min-height:66vh; display:flex; flex-direction:column; justify-content:space-between; text-align:center; padding:6vh 0 12vh; }
  .end-top{ margin-top:6vh; }
  .end-label{ font-size:14px; color:var(--text-dim); }
  .end-score{ font-family:var(--font-sans); font-weight:700; font-size:clamp(100px,20vw,200px); margin:10px 0 0; line-height:1; }
  .end-sub{ color:var(--text-dim); font-size:17px; margin:20px 0 0; }
  .end-actions{ display:grid; grid-template-columns:1fr auto 1fr; align-items:center; gap:12px; }
  .end-actions .end-act-left{ justify-self:start; }
  .end-actions .end-act-center{ justify-self:center; }
  .end-actions .end-act-right{ justify-self:end; }
  @media (max-width:480px){
    .end-actions{ grid-template-columns:1fr; justify-items:center; gap:10px; }
    .end-actions .end-act-left, .end-actions .end-act-right{ justify-self:center; }
  }

  footer.credit{ flex:none; text-align:center; font-size:12px; color:var(--text-dim); padding:24px 0; }

  .scroll-top-btn{
    position:fixed; top:14px; left:50%; z-index:40;
    width:44px; height:44px; border-radius:50%; border:none;
    background:var(--frame); color:var(--text); box-shadow:var(--shadow);
    display:flex; align-items:center; justify-content:center; cursor:pointer;
    opacity:0; pointer-events:none;
    transform:translateX(-50%) translateY(-12px);
    transition:opacity .2s ease, transform .2s ease;
  }
  .scroll-top-btn.show{ opacity:1; pointer-events:auto; transform:translateX(-50%) translateY(0); }
  .scroll-top-btn:hover{ opacity:0.8; }
  .scroll-top-btn svg{ width:18px; height:18px; }