@font-face {
      font-family: "Frozito";
      src: url("../fonts/Frozito-eZ99g.ttf") format("truetype");
      font-display: swap;
    }

    @font-face {
      font-family: "Minecraft";
      src: url("../fonts/Minecraft.otf") format("opentype");
      font-weight: 400;
      font-display: swap;
    }

    @font-face {
      font-family: "Minecraft";
      src: url("../fonts/Minecraft-Bold.otf") format("opentype");
      font-weight: 700 900;
      font-display: swap;
    }

    :root {
      color-scheme: light;
      --bg: #f6f3ea;
      --bg-pattern: linear-gradient(135deg, rgba(255,255,255,.62), rgba(255,255,255,0));
      --bg-art: none;
      --bg-art-opacity: 0;
      --bg-art-position: center;
      --surface: #ffffff;
      --surface-strong: #fff9e9;
      --ink: #1e2b2a;
      --muted: #5a6763;
      --line: #d9ded2;
      --primary: #216c62;
      --primary-strong: #174e48;
      --primary-soft: #d6eee9;
      --accent: #d67a3d;
      --accent-soft: #fee8cc;
      --good: #20835f;
      --bad: #b24747;
      --shadow: 0 18px 44px rgba(38, 44, 39, .14);
      --radius: 8px;
      --radius-small: 6px;
      --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      --font-display: var(--font-main);
      --focus: 0 0 0 4px rgba(33,108,98,.22);
    }

    body.theme-frozen {
      --bg: #eaf8fb;
      /* --bg-pattern:
        linear-gradient(90deg, rgba(234, 248, 251, .88) 0%, rgba(255, 255, 255, .74) 45%, rgba(234, 248, 251, .34) 100%),
        repeating-radial-gradient(circle at 12% 18%, rgba(255,255,255,.72) 0 1px, transparent 1px 38px),
        repeating-linear-gradient(120deg, rgba(113, 176, 204, .13) 0 2px, transparent 2px 30px); */
      --bg-art: url("../images/frozen-background.png");
      --bg-art-opacity: .9;
      --surface: #ffffff;
      --surface-strong: #edfaff;
      --ink: #183343;
      --muted: #536c79;
      --line: #bedbe6;
      --primary: #287da1;
      --primary-strong: #1d5f7b;
      --primary-soft: #d9f1fa;
      --accent: #816bb8;
      --accent-soft: #eee9ff;
      --good: #23806f;
      --bad: #a9456b;
      --shadow: 0 18px 46px rgba(46, 91, 116, .18);
      --font-main: "Frozito", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      --font-display: "Frozito", var(--font-main);
      --focus: 0 0 0 4px rgba(40,125,161,.24);
    }

    body.theme-minecraft {
      --bg: #d8eccb;
      --bg-pattern:
        linear-gradient(90deg, rgba(235, 246, 220, .84) 0%, rgba(255, 254, 242, .5) 48%, rgba(216, 236, 203, .12) 100%),
        linear-gradient(90deg, rgba(65, 120, 73, .12) 1px, transparent 1px),
        linear-gradient(rgba(65, 120, 73, .12) 1px, transparent 1px);
      --bg-art: url("../images/minecraft-background.png");
      --bg-art-opacity: .9;
      --bg-art-position: center right;
      --surface: #fffef2;
      --surface-strong: #e8f0ca;
      --ink: #1e311c;
      --muted: #556246;
      --line: #93a673;
      --primary: #3c7d37;
      --primary-strong: #285c2b;
      --primary-soft: #dcebc8;
      --accent: #7867a9;
      --accent-soft: #ece8ff;
      --good: #2f7d3d;
      --bad: #9d4540;
      --shadow: 8px 8px 0 rgba(48, 77, 35, .2);
      --radius: 2px;
      --radius-small: 2px;
      --font-main: "Minecraft", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
      --font-display: "Minecraft", var(--font-main);
      --focus: 0 0 0 4px rgba(60,125,55,.26);
    }

    * {
      box-sizing: border-box;
    }

    html {
      min-height: 100%;
      background: var(--bg);
    }

    body {
      position: relative;
      isolation: isolate;
      min-height: 100vh;
      margin: 0;
      font-family: var(--font-main);
      color: var(--ink);
      background: var(--bg);
      transition: background .25s ease, color .25s ease;
    }

    body::before,
    body::after {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
    }

    body::before {
      z-index: 0;
      background-image: var(--bg-art);
      background-position: var(--bg-art-position);
      background-size: cover;
      opacity: var(--bg-art-opacity);
      transition: opacity .25s ease;
    }

    body::after {
      z-index: 0;
      background: var(--bg-pattern);
    }

    button,
    input {
      font: inherit;
    }

    button {
      border: 0;
    }

    .app-shell {
      position: relative;
      z-index: 1;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    .app-header {
      width: min(1120px, calc(100% - 32px));
      margin: 0 auto;
      padding: 24px 0 8px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
      min-width: 0;
    }

    .brand-mark {
      width: 44px;
      height: 44px;
      border-radius: var(--radius);
      display: grid;
      place-items: center;
      color: #fff;
      background: var(--primary);
      box-shadow: var(--shadow);
      font-family: var(--font-display);
      font-weight: 800;
      font-size: 1.35rem;
      flex: 0 0 auto;
    }

    .brand h1 {
      margin: 0;
      font-family: var(--font-display);
      font-size: clamp(1.45rem, 3vw, 2.25rem);
      line-height: 1.05;
      letter-spacing: 0;
    }

    .brand p {
      margin: 3px 0 0;
      color: var(--muted);
      font-size: .98rem;
    }

    .screen {
      width: min(1120px, calc(100% - 32px));
      margin: 0 auto;
      padding: 24px 0 40px;
      flex: 1;
    }

    .hidden {
      display: none !important;
    }

    .setup-layout {
      display: grid;
      grid-template-columns: minmax(0, 1.35fr) minmax(310px, .75fr);
      gap: 24px;
      align-items: start;
    }

    .setup-main,
    .setup-side,
    .play-panel,
    .result-block {
      background: color-mix(in srgb, var(--surface) 94%, transparent);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }

    .setup-main,
    .setup-side {
      padding: 20px;
    }

    .setup-section + .setup-section {
      margin-top: 28px;
    }

    .section-title,
    .side-title {
      margin: 0 0 14px;
      font-family: var(--font-display);
      font-size: 1.18rem;
      letter-spacing: 0;
    }

    .option-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
    }

    .theme-grid {
      grid-template-columns: 1fr;
    }

    .choice-card {
      display: block;
      min-width: 0;
      cursor: pointer;
      -webkit-tap-highlight-color: transparent;
    }

    .choice-card input {
      position: absolute;
      opacity: 0;
      pointer-events: none;
    }

    .choice-inner {
      min-height: 100%;
      display: grid;
      grid-template-columns: auto minmax(0, 1fr);
      gap: 12px;
      padding: 14px;
      border: 2px solid var(--line);
      border-radius: var(--radius);
      background: var(--surface);
      transition: transform .16s ease, border-color .16s ease, background .16s ease, box-shadow .16s ease;
    }

    .choice-card:hover .choice-inner {
      border-color: color-mix(in srgb, var(--primary) 52%, var(--line));
      transform: translateY(-1px);
    }

    .choice-card input:focus-visible + .choice-inner {
      box-shadow: var(--focus);
    }

    .choice-card input:checked + .choice-inner {
      border-color: var(--primary);
      background: var(--primary-soft);
    }

    .check-indicator,
    .radio-indicator {
      width: 24px;
      height: 24px;
      margin-top: 1px;
      display: grid;
      place-items: center;
      border: 2px solid var(--line);
      background: #fff;
      flex: 0 0 auto;
    }

    .check-indicator {
      border-radius: 5px;
    }

    .radio-indicator {
      border-radius: 999px;
    }

    .choice-card input:checked + .choice-inner .check-indicator,
    .choice-card input:checked + .choice-inner .radio-indicator {
      border-color: var(--primary);
      background: var(--primary);
    }

    .choice-card input:checked + .choice-inner .check-indicator::after {
      content: "";
      width: 11px;
      height: 6px;
      border-left: 3px solid #fff;
      border-bottom: 3px solid #fff;
      transform: rotate(-45deg) translateY(-1px);
    }

    .choice-card input:checked + .choice-inner .radio-indicator::after {
      content: "";
      width: 9px;
      height: 9px;
      border-radius: 999px;
      background: #fff;
    }

    .choice-title {
      display: block;
      font-weight: 800;
      line-height: 1.2;
    }

    .choice-description {
      display: block;
      margin-top: 4px;
      color: var(--muted);
      font-size: .92rem;
      line-height: 1.35;
    }

    .theme-swatch {
      width: 28px;
      height: 28px;
      border-radius: var(--radius-small);
      border: 2px solid rgba(0,0,0,.08);
      align-self: start;
    }

    .theme-swatch.simple {
      background:
        linear-gradient(135deg, #216c62 0 50%, #d67a3d 50% 100%);
    }

    .theme-swatch.frozen {
      background:
        linear-gradient(135deg, #78c7df 0 45%, #ffffff 45% 62%, #816bb8 62% 100%);
    }

    .theme-swatch.minecraft {
      background:
        linear-gradient(90deg, transparent 47%, rgba(0,0,0,.16) 47% 53%, transparent 53%),
        linear-gradient(0deg, transparent 47%, rgba(0,0,0,.16) 47% 53%, transparent 53%),
        linear-gradient(135deg, #3c7d37 0 50%, #ece8ff 50% 100%);
      background-size: 14px 14px, 14px 14px, 100% 100%;
      image-rendering: pixelated;
    }

    .limit-mode {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
      padding: 4px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--surface-strong);
    }

    .limit-mode label {
      position: relative;
      display: block;
      cursor: pointer;
    }

    .limit-mode input {
      position: absolute;
      opacity: 0;
      pointer-events: none;
    }

    .limit-mode span {
      min-height: 48px;
      display: grid;
      place-items: center;
      padding: 9px 10px;
      border-radius: var(--radius-small);
      color: var(--muted);
      font-weight: 800;
      text-align: center;
    }

    .limit-mode input:checked + span {
      background: var(--primary);
      color: #fff;
    }

    .limit-mode input:focus-visible + span {
      box-shadow: var(--focus);
    }

    .number-row {
      margin-top: 16px;
      display: grid;
      gap: 8px;
    }

    .number-row label {
      font-weight: 800;
    }

    .number-input-wrap {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 10px;
      align-items: center;
    }

    .number-row input,
    .answer-input {
      width: 100%;
      border: 2px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      color: var(--ink);
      outline: 0;
      transition: border-color .16s ease, box-shadow .16s ease, background .16s ease;
    }

    .number-row input {
      min-height: 56px;
      padding: 10px 14px;
      font-size: 1.35rem;
      font-weight: 800;
    }

    .number-unit {
      color: var(--muted);
      font-weight: 800;
    }

    .number-row input:focus,
    .answer-input:focus {
      border-color: var(--primary);
      box-shadow: var(--focus);
    }

    .setup-error {
      min-height: 24px;
      margin: 14px 0 0;
      color: var(--bad);
      font-weight: 800;
    }

    .button-row {
      margin-top: 18px;
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
    }

    .btn {
      min-height: 48px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 18px;
      border-radius: var(--radius);
      cursor: pointer;
      font-weight: 900;
      text-align: center;
      color: var(--ink);
      background: var(--surface-strong);
      border: 2px solid var(--line);
      transition: transform .14s ease, box-shadow .14s ease, background .14s ease, border-color .14s ease;
    }

    .btn:hover {
      transform: translateY(-1px);
      border-color: color-mix(in srgb, var(--primary) 54%, var(--line));
    }

    .btn:focus-visible {
      outline: 0;
      box-shadow: var(--focus);
    }

    .btn-primary {
      width: 100%;
      min-height: 64px;
      color: #fff;
      background: var(--primary);
      border-color: var(--primary);
      box-shadow: var(--shadow);
      font-size: 1.25rem;
    }

    .btn-primary:hover {
      background: var(--primary-strong);
      border-color: var(--primary-strong);
    }

    .btn-secondary {
      background: var(--surface);
    }

    .btn-compact {
      min-height: 44px;
      padding: 10px 14px;
    }

    .icon-btn {
      width: 44px;
      height: 44px;
      padding: 0;
      border-radius: var(--radius);
      color: var(--primary);
      background: var(--surface);
      border: 2px solid var(--line);
      cursor: pointer;
      display: grid;
      place-items: center;
    }

    .icon-btn svg {
      width: 22px;
      height: 22px;
      display: block;
    }

    .icon-btn .eye-open {
      display: none;
    }

    .icon-btn.is-active .eye-open {
      display: block;
    }

    .icon-btn.is-active .eye-closed {
      display: none;
    }

    .icon-btn:focus-visible {
      outline: 0;
      box-shadow: var(--focus);
    }

    .play-screen {
      display: grid;
      gap: 18px;
      align-content: start;
    }

    .hud {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr)) auto auto;
      gap: 10px;
      align-items: stretch;
    }

    .hud-item {
      min-height: 64px;
      padding: 10px 14px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: color-mix(in srgb, var(--surface) 92%, transparent);
      display: grid;
      align-content: center;
      gap: 2px;
    }

    .hud-label {
      color: var(--muted);
      font-size: .86rem;
      font-weight: 800;
    }

    .hud-value {
      font-family: var(--font-display);
      font-size: clamp(1.08rem, 2.6vw, 1.45rem);
      font-weight: 900;
      line-height: 1.08;
      overflow-wrap: anywhere;
    }

    .end-session-button {
      min-height: 64px;
      white-space: nowrap;
    }

    .play-panel {
      position: relative;
      min-height: min(62vh, 620px);
      padding: clamp(18px, 4vw, 42px);
      display: grid;
      grid-template-rows: auto minmax(0, 1fr) auto;
      gap: clamp(18px, 3vw, 30px);
      overflow: hidden;
    }

    .play-panel::after {
      position: absolute;
      inset: 0;
      z-index: 1;
      pointer-events: none;
    }

    .play-panel > * {
      position: relative;
      z-index: 2;
    }

    .theme-scene {
      min-height: 44px;
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 8px;
      opacity: .95;
    }

    .scene-piece {
      display: inline-block;
      width: 42px;
      height: 42px;
      border-radius: var(--radius);
      background: var(--primary-soft);
      border: 2px solid color-mix(in srgb, var(--primary) 50%, var(--line));
    }

    .scene-piece:nth-child(2) {
      background: var(--accent-soft);
      border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
      transform: translateY(8px);
    }

    .scene-piece:nth-child(3) {
      background: var(--surface-strong);
      transform: translateY(-5px);
    }

    body.theme-frozen .scene-piece {
      display: grid;
      place-items: center;
      border: 0;
      border-radius: 0;
      background: transparent;
      color: color-mix(in srgb, var(--primary) 70%, #fff);
    }

    body.theme-frozen .scene-piece::before {
      content: "❄";
      font-family: var(--font-display);
      font-size: 2.2rem;
      line-height: 1;
      text-shadow: 0 2px 0 #fff, 0 0 18px rgba(255,255,255,.9);
    }

    body.theme-minecraft .scene-piece {
      border-radius: 0;
      border-color: #6a8a3d;
      background:
        linear-gradient(#6fc25f 0 34%, #4d963d 34% 44%, #8a5a30 44% 100%);
      box-shadow: inset -6px -6px 0 rgba(0,0,0,.12), inset 6px 6px 0 rgba(255,255,255,.28);
      image-rendering: pixelated;
    }

    .task-area {
      min-height: 260px;
      display: grid;
      place-items: center;
      gap: 18px;
      align-content: center;
    }

    .equation {
      width: 100%;
      text-align: center;
      font-family: var(--font-display);
      font-size: clamp(3rem, 9vw, 6.4rem);
      line-height: 1.04;
      font-weight: 900;
      letter-spacing: 0;
      overflow-wrap: anywhere;
    }

    .answer-form {
      width: min(520px, 100%);
      margin: 0 auto;
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 12px;
      align-items: stretch;
    }

    .answer-input {
      min-height: 70px;
      padding: 10px 18px;
      font-size: clamp(1.8rem, 5vw, 2.4rem);
      font-weight: 900;
      text-align: center;
    }

    .answer-form .btn {
      min-width: 128px;
      min-height: 70px;
      font-size: 1.08rem;
    }

    .feedback {
      min-height: 32px;
      display: grid;
      place-items: center;
      color: var(--muted);
      font-weight: 900;
      font-size: 1.05rem;
    }

    .play-panel.correct-flash .equation {
      animation: pop-correct .52s ease both;
    }

    .play-panel.correct-flash .scene-piece {
      animation: float-correct .58s ease both;
    }

    body.theme-simple .play-panel.fast-correct::after {
      content: "";
      background:
        radial-gradient(circle at 24% 30%, rgba(214,122,61,.55) 0 5px, transparent 6px),
        radial-gradient(circle at 74% 28%, rgba(33,108,98,.4) 0 4px, transparent 5px),
        radial-gradient(circle at 60% 70%, rgba(32,131,95,.35) 0 6px, transparent 7px);
      animation: sparkle-burst .74s ease-out both;
    }

    body.theme-frozen .play-panel.fast-correct::after {
      content: "❄";
      display: grid;
      place-items: center;
      color: rgba(255,255,255,.98);
      font-family: var(--font-display);
      font-size: clamp(3rem, 12vw, 8rem);
      line-height: 1;
      text-shadow:
        -160px -44px 0 rgba(113,176,204,.88),
        165px -24px 0 rgba(129,107,184,.72),
        -108px 82px 0 rgba(255,255,255,.9),
        122px 94px 0 rgba(113,176,204,.72),
        0 0 28px rgba(255,255,255,.95);
      animation: snow-burst .82s ease-out both;
    }

    body.theme-minecraft .play-panel.fast-correct::after {
      content: "";
      width: 30px;
      height: 30px;
      top: 48%;
      left: 50%;
      right: auto;
      bottom: auto;
      background:
        linear-gradient(#70c65f 0 34%, #4c913c 34% 45%, #8b5a2f 45% 100%);
      border: 2px solid rgba(30,49,28,.28);
      box-shadow:
        -170px -46px 0 #6fc25f,
        142px -52px 0 #8b5a2f,
        -118px 74px 0 #4c913c,
        98px 88px 0 #6fc25f,
        0 0 0 3px rgba(255,255,255,.35) inset,
        6px 6px 0 rgba(30,49,28,.18);
      image-rendering: pixelated;
      animation: cube-burst .78s steps(5, end) both;
    }

    .play-panel.wrong-flash .answer-input {
      animation: shake-neutral .34s ease both;
      border-color: var(--bad);
      background: color-mix(in srgb, var(--accent-soft) 70%, #fff);
    }

    @keyframes pop-correct {
      0% { transform: scale(1); }
      45% { transform: scale(1.045); color: var(--good); }
      100% { transform: scale(1); }
    }

    @keyframes float-correct {
      0% { transform: translateY(0); }
      45% { transform: translateY(-12px); }
      100% { transform: translateY(0); }
    }

    @keyframes sparkle-burst {
      0% { opacity: 0; transform: scale(.78); }
      35% { opacity: 1; transform: scale(1); }
      100% { opacity: 0; transform: scale(1.22); }
    }

    @keyframes snow-burst {
      0% { opacity: 0; transform: scale(.45) rotate(0deg); }
      42% { opacity: 1; transform: scale(1) rotate(24deg); }
      100% { opacity: 0; transform: scale(1.38) rotate(58deg); }
    }

    @keyframes cube-burst {
      0% { opacity: 0; transform: translate(-50%, -50%) scale(.55); }
      45% { opacity: 1; transform: translate(-50%, -50%) scale(1.1); }
      100% { opacity: 0; transform: translate(-50%, -50%) scale(1.45); }
    }

    @keyframes shake-neutral {
      0%, 100% { transform: translateX(0); }
      20% { transform: translateX(-7px); }
      45% { transform: translateX(7px); }
      70% { transform: translateX(-4px); }
    }

    .results-screen {
      display: grid;
      gap: 18px;
    }

    .top-replay {
      width: min(360px, 100%);
      justify-self: start;
    }

    .results-grid {
      display: grid;
      grid-template-columns: minmax(280px, .8fr) minmax(0, 1.2fr);
      gap: 18px;
      align-items: start;
    }

    .result-block {
      padding: 20px;
    }

    .result-block h2,
    .result-block h3 {
      margin: 0 0 14px;
      font-family: var(--font-display);
      letter-spacing: 0;
    }

    .star-row {
      display: flex;
      gap: 8px;
      align-items: center;
      margin-bottom: 18px;
      font-size: clamp(2.2rem, 8vw, 4rem);
      line-height: 1;
      color: var(--accent);
    }

    .rating-icon {
      width: 1em;
      height: 1em;
      display: inline-grid;
      place-items: center;
      flex: 0 0 auto;
    }

    .rating-icon::before {
      line-height: 1;
    }

    .rating-icon.star::before {
      content: "★";
    }

    .rating-icon.snowflake::before {
      content: "❄";
      text-shadow: 0 2px 0 #fff, 0 0 14px rgba(255,255,255,.85);
    }

    .rating-icon.cube {
      width: .82em;
      height: .82em;
      margin-inline: .04em;
      align-self: center;
      background:
        linear-gradient(#74c767 0 35%, #4e963e 35% 45%, #8d5c32 45% 100%);
      border: .055em solid rgba(30,49,28,.35);
      box-shadow: inset -.11em -.11em 0 rgba(0,0,0,.14), inset .09em .09em 0 rgba(255,255,255,.32);
      image-rendering: pixelated;
    }

    .star-empty {
      color: color-mix(in srgb, var(--line) 80%, var(--surface));
    }

    .rating-icon.cube.star-empty {
      background:
        linear-gradient(color-mix(in srgb, var(--line) 75%, #fff) 0 35%, color-mix(in srgb, var(--line) 65%, #fff) 35% 45%, color-mix(in srgb, var(--line) 70%, #8d5c32) 45% 100%);
      border-color: color-mix(in srgb, var(--line) 82%, var(--surface));
    }

    .summary-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px;
    }

    .summary-item {
      min-height: 88px;
      padding: 14px;
      border-radius: var(--radius);
      background: var(--surface-strong);
      border: 1px solid var(--line);
      display: grid;
      align-content: center;
      gap: 3px;
    }

    .summary-item span {
      color: var(--muted);
      font-weight: 800;
      font-size: .9rem;
    }

    .summary-item strong {
      font-family: var(--font-display);
      font-size: clamp(1.25rem, 4vw, 2rem);
      line-height: 1.08;
      overflow-wrap: anywhere;
    }

    .details-list {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 8px;
      margin-bottom: 16px;
    }

    .detail-pill {
      padding: 10px;
      border-radius: var(--radius-small);
      background: var(--surface-strong);
      border: 1px solid var(--line);
    }

    .detail-pill span {
      display: block;
      color: var(--muted);
      font-size: .78rem;
      font-weight: 800;
    }

    .detail-pill strong {
      display: block;
      margin-top: 2px;
      font-family: var(--font-display);
      font-size: 1.05rem;
    }

    .table-wrap {
      width: 100%;
      overflow-x: auto;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--surface);
    }

    table {
      width: 100%;
      min-width: 640px;
      border-collapse: collapse;
    }

    th,
    td {
      padding: 11px 12px;
      text-align: left;
      border-bottom: 1px solid var(--line);
      vertical-align: top;
    }

    th {
      color: var(--muted);
      font-size: .84rem;
      text-transform: uppercase;
      letter-spacing: 0;
      background: var(--surface-strong);
    }

    tr:last-child td {
      border-bottom: 0;
    }

    .result-correct {
      color: var(--good);
      font-weight: 900;
    }

    .result-wrong {
      color: var(--bad);
      font-weight: 900;
    }

    .sr-only {
      position: absolute;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0, 0, 0, 0);
      white-space: nowrap;
      border: 0;
    }

    body.theme-minecraft .setup-main,
    body.theme-minecraft .setup-side,
    body.theme-minecraft .play-panel,
    body.theme-minecraft .result-block,
    body.theme-minecraft .choice-inner,
    body.theme-minecraft .hud-item,
    body.theme-minecraft .summary-item,
    body.theme-minecraft .detail-pill,
    body.theme-minecraft .table-wrap,
    body.theme-minecraft .btn,
    body.theme-minecraft input {
      box-shadow: inset -3px -3px 0 rgba(0,0,0,.12), inset 3px 3px 0 rgba(255,255,255,.28);
    }

    @media (max-width: 900px) {
      .setup-layout,
      .results-grid {
        grid-template-columns: 1fr;
      }

      .option-grid {
        grid-template-columns: 1fr;
      }

      .details-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }

    @media (max-width: 640px) {
      .app-header,
      .screen {
        width: min(100% - 22px, 1120px);
      }

      .app-header {
        align-items: flex-start;
        padding-top: 16px;
      }

      .brand-mark {
        width: 38px;
        height: 38px;
        font-size: 1.1rem;
      }

      .brand p {
        display: none;
      }

      .setup-main,
      .setup-side,
      .result-block {
        padding: 14px;
      }

      .hud {
        grid-template-columns: 1fr 1fr auto;
      }

      .hud-item {
        min-height: 58px;
        padding: 9px 10px;
      }

      #limitToggle {
        grid-column: 3;
        grid-row: 1;
      }

      .hud-item.limit-info {
        grid-column: 1 / -1;
      }

      .end-session-button {
        grid-column: 1 / -1;
        width: 100%;
        min-height: 52px;
      }

      .play-panel {
        min-height: calc(100vh - 210px);
        padding: 16px;
      }

      .theme-scene {
        min-height: 32px;
      }

      .scene-piece {
        width: 30px;
        height: 30px;
      }

      .task-area {
        min-height: 220px;
      }

      .answer-form {
        grid-template-columns: 1fr;
      }

      .answer-form .btn {
        width: 100%;
      }

      .summary-grid,
      .details-list {
        grid-template-columns: 1fr;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: .01ms !important;
      }
    }