html, body { height: 100%; overflow: hidden; }

    #app { height: 100dvh; position: relative; }

    .screen {
      display: none;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100dvh;
      padding: 24px;
      text-align: center;
      gap: 0;
    }
    .screen.active { display: flex; }

    /* ── JOIN ─────────────────────────────────────────── */
    .logo {
      font-family: var(--font-display);
      font-size: 2.8rem;
      letter-spacing: .06em;
      color: var(--primary);
      margin-bottom: 4px;
      text-decoration: none;
      display: inline-block;
    }
    .logo:hover { opacity: .85; }
    .logo-sub {
      color: var(--muted);
      font-size: .8rem;
      letter-spacing: .14em;
      text-transform: uppercase;
      margin-bottom: 36px;
    }
    .form-stack {
      width: 100%;
      max-width: 320px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    input.inp {
      background: var(--surface);
      border: 1.5px solid var(--border);
      border-radius: var(--r);
      color: var(--text);
      font-family: inherit;
      font-size: 1rem;
      padding: 14px 16px;
      width: 100%;
      outline: none;
      transition: border-color .15s;
      text-align: center;
    }
    input.inp:focus { border-color: var(--primary); }
    input.inp-code {
      font-family: var(--font-display);
      font-size: 2rem;
      letter-spacing: .25em;
    }
    .btn-join {
      background: var(--primary);
      border: none;
      border-radius: var(--r);
      box-shadow: var(--btn-shadow);
      color: var(--btn-primary-text);
      cursor: pointer;
      font-family: var(--font-display);
      font-size: 1.4rem;
      letter-spacing: .08em;
      padding: 14px;
      width: 100%;
      transition: opacity .15s, transform .1s;
    }
    .btn-join:active { transform: scale(.97); opacity: .88; }
    .err { color: var(--danger); font-size: .85rem; min-height: 20px; }

    /* ── LOBBY ───────────────────────────────────────── */
    .big-emoji { font-size: 4rem; margin-bottom: 12px; }
    .nick { font-family: var(--font-display); font-size: 2.4rem; letter-spacing: .04em; color: var(--primary); }
    .lobby-hint { color: var(--muted); font-size: .9rem; margin-top: 10px; display: flex; align-items: center; gap: 6px; justify-content: center; }
    .dot { width: 8px; height: 8px; background: var(--success); border-radius: 50%; animation: pulse 1.4s ease-in-out infinite; }
    @keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.4;transform:scale(.75)} }

    /* ── QUESTION ────────────────────────────────────── */
    #screen-question { justify-content: space-between; padding-top: 28px; }

    .timer-track {
      position: fixed; top: 0; left: 0; right: 0; height: 5px;
      background: rgba(255,255,255,.07); z-index: 99;
    }
    #timer-bar { height: 100%; width: 100%; background: var(--success); transition: background .4s; }

    .q-text {
      font-size: clamp(1.15rem, 4.5vw, 1.55rem);
      font-weight: 700;
      line-height: 1.4;
      max-width: 460px;
      flex: 1;
      display: flex;
      align-items: center;
      padding: 8px 0;
    }

    /* MC 2×2 grid */
    .mc-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      width: 100%;
      max-width: 460px;
      padding-bottom: 20px;
    }
    .mc-btn {
      border: none;
      border-radius: var(--r);
      box-shadow: var(--btn-shadow);
      color: var(--btn-primary-text);
      cursor: pointer;
      font-family: inherit;
      font-size: .88rem;
      font-weight: 600;
      min-height: 76px;
      padding: 10px 12px;
      text-align: left;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: transform .1s, opacity .15s, box-shadow .15s;
      line-height: 1.3;
    }
    .mc-btn:active { transform: scale(.95); }
    .mc-btn:disabled { cursor: default; }
    .mc-letter {
      background: rgba(255,255,255,.25);
      border-radius: 6px;
      flex-shrink: 0;
      font-family: var(--font-display);
      font-size: 1.1rem;
      min-width: 28px;
      padding: 2px 5px;
      text-align: center;
    }
    .mc-0 { background: var(--primary); }
    .mc-1 { background: var(--accent-2); }
    .mc-2 { background: var(--success); }
    .mc-3 { background: var(--accent-3); }

    /* Free text */
    .ft-wrap {
      width: 100%;
      max-width: 460px;
      padding-bottom: 20px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    textarea {
      background: var(--surface);
      border: 1.5px solid var(--border);
      border-radius: var(--r);
      color: var(--text);
      font-family: inherit;
      font-size: 1rem;
      padding: 14px 16px;
      resize: none;
      width: 100%;
      outline: none;
    }
    textarea:focus { border-color: var(--primary); }
    .btn-send {
      background: var(--primary);
      border: none;
      border-radius: var(--r);
      box-shadow: var(--btn-shadow);
      color: #fff;
      cursor: pointer;
      font-family: var(--font-display);
      font-size: 1.35rem;
      letter-spacing: .06em;
      padding: 14px;
      transition: opacity .15s, transform .1s;
    }
    .btn-send:active { transform: scale(.97); }
    .btn-send:disabled { opacity: .4; cursor: default; }

    /* ── WAITING ─────────────────────────────────────── */
    .wait-icon { font-size: 4.5rem; margin-bottom: 14px; }
    .wait-title { font-family: var(--font-display); font-size: 2.2rem; letter-spacing: .04em; }
    .wait-sub { color: var(--muted); font-size: .9rem; margin-top: 6px; }

    /* ── RESULT ──────────────────────────────────────── */
    .res-correct-label {
      background: var(--surface);
      border-radius: 50px;
      color: var(--rank-gold);
      font-size: .8rem;
      letter-spacing: .1em;
      text-transform: uppercase;
      padding: 4px 14px;
      margin-bottom: 8px;
    }
    .res-answer {
      font-family: var(--font-display);
      font-size: 2rem;
      letter-spacing: .04em;
      margin-bottom: 24px;
      max-width: 300px;
    }
    .lb-mini { width: 100%; max-width: 340px; }
    .lb-head { color: var(--muted); font-size: .75rem; letter-spacing: .12em; text-transform: uppercase; margin-bottom: 8px; }
    .lb-row {
      align-items: center;
      background: var(--surface);
      border-radius: 8px;
      display: flex;
      gap: 10px;
      margin-bottom: 6px;
      padding: 8px 12px;
      font-size: .9rem;
    }
    .lb-rk { font-family: var(--font-display); font-size: 1rem; min-width: 22px; color: var(--muted); }
    .lb-rk-1 { color: var(--rank-gold); }
    .lb-rk-2 { color: #c0c0c0; }
    .lb-rk-3 { color: #cd7f32; }
    .lb-nm { flex: 1; font-weight: 500; }
    .lb-pt { color: var(--success); font-family: var(--font-display); font-size: 1rem; }

    /* ── SESSION ENDED ───────────────────────────────── */
    .end-title { font-family: var(--font-display); font-size: 2.8rem; letter-spacing: .04em; margin-bottom: 4px; }
    .end-sub { color: var(--muted); font-size: .85rem; margin-bottom: 24px; }
    .final-lb { width: 100%; max-width: 340px; overflow-y: auto; max-height: 55dvh; }
    .final-row {
      align-items: center;
      background: var(--surface);
      border-radius: 8px;
      display: flex;
      gap: 12px;
      margin-bottom: 8px;
      padding: 10px 14px;
    }
    .final-row.r1 { background: rgba(255,209,102,.12); border: 1px solid rgba(255,209,102,.28); }
    .final-row.r2 { background: rgba(192,192,192,.07); border: 1px solid rgba(192,192,192,.18); }
    .final-row.r3 { background: rgba(205,127,50,.07);  border: 1px solid rgba(205,127,50,.18); }
    .final-medal { font-size: 1.3rem; }
    .final-nm { flex: 1; font-weight: 600; font-size: .95rem; }
    .final-pt { color: var(--rank-gold); font-family: var(--font-display); font-size: 1.05rem; }

    /* ── Scoreboard overrides (smaller/mobile sizing) ── */
    .sb-row { gap:8px; padding:6px 0; font-size:.9rem; }
    .sb-pts { font-family: var(--font-display); }

    /* ── BACKGROUND DEPTH ───────────────────────────── */
    body {
      background:
        radial-gradient(ellipse at 50% -10%, rgba(255,107,53,.06) 0%, transparent 58%),
        var(--bg);
    }
    [data-theme="aurora"] body {
      background:
        radial-gradient(ellipse at 50% -10%, rgba(139,92,255,.18) 0%, transparent 60%),
        radial-gradient(ellipse at 50% 110%,  rgba(45,226,230,.08) 0%, transparent 55%),
        var(--bg);
    }
    [data-theme="pop"] body { background: var(--bg); }

    /* ── BUZZ SCREEN ────────────────────────────────── */
    #buzz-round-label { font-size: 1rem; margin-bottom: 8px; text-align: center; color: var(--muted); }
    #buzz-status { margin-top: 20px; color: var(--muted); font-size: .95rem; text-align: center; }
    #buzz-scoreboard { margin-top: 16px; width: 100%; max-width: 360px; }

    .buzz-btn {
      width: min(70vw, 320px); height: min(70vw, 320px);
      border-radius: 50%; border: 0;
      background: var(--buzz); color: #fff;
      font-size: 2rem; font-weight: 800; cursor: pointer;
      transition: transform .1s, opacity .15s, box-shadow .3s, background .3s, color .3s;
    }
    .buzz-btn:active:not(:disabled) { transform: scale(.92); }
    .buzz-idle   { opacity: .4; }
    .buzz-buzzed { opacity: .55; }
    .buzz-locked {
      background: var(--surface);
      color: var(--muted);
      border: 3px solid color-mix(in srgb, var(--buzz) 25%, transparent);
    }
    .buzz-armed  { opacity: 1; }

    /* ── Buzz-glow colour tokens ─────────────────────── */
    :root          { --buzz-glow-0: rgba(244,63,94,.45);  --buzz-glow-1: rgba(244,63,94,0); }
    [data-theme="aurora"] { --buzz-glow-0: rgba(255,61,154,.45);  --buzz-glow-1: rgba(255,61,154,0); }
    [data-theme="pop"]    { --buzz-glow-0: rgba(255,77,141,.45);  --buzz-glow-1: rgba(255,77,141,0); }

    /* ── ANIMATIONS ─────────────────────────────────── */
    @media (prefers-reduced-motion: no-preference) {
      /* Buzz armed pulse-glow */
      @keyframes buzz-glow {
        0%, 100% { box-shadow: 0 0 0 0 var(--buzz-glow-0); }
        55%       { box-shadow: 0 0 0 28px var(--buzz-glow-1); }
      }
      .buzz-armed { animation: buzz-glow 2.2s ease-in-out infinite; }

      /* Screen enter fade+rise */
      @keyframes screen-enter {
        from { opacity: 0; transform: translateY(10px); }
        to   { opacity: 1; transform: translateY(0); }
      }
      .screen.screen-enter { animation: screen-enter .18s ease both; }

      /* Wait icon spring-pop */
      @keyframes icon-pop {
        0%   { transform: scale(1.5); }
        100% { transform: scale(1); }
      }
      .wait-icon.icon-pop { animation: icon-pop .35s cubic-bezier(.34,1.56,.64,1); }

      /* End screen row slide-in */
      .row-hidden { opacity: 0; transform: translateX(-20px); }
      @keyframes row-reveal {
        from { opacity: 0; transform: translateX(-20px); }
        to   { opacity: 1; transform: translateX(0); }
      }
      .row-reveal { animation: row-reveal .28s ease both; }
    }

/* #154: join-screen back link (was inline style=) */
.join-back {
  display: inline-block; margin-top: 22px;
  color: var(--muted); font-size: .85rem; text-decoration: none;
}