/* ============================================
       RESET & BASE
       ============================================ */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html {
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      text-rendering: optimizeLegibility;
      scroll-behavior: smooth;
    }

    :root {
      --font-display: 'Chillax', 'Plus Jakarta Sans', sans-serif;
      --font-body: 'Plus Jakarta Sans', 'Segoe UI', sans-serif;

      /* Game theme colors */
      --color-bg: #0f1729;
      --color-bg-lighter: #162040;
      --color-surface: #1a2744;
      --color-surface-2: #1e2f52;
      --color-border: rgba(255,255,255,0.1);
      --color-text: #e8ecf4;
      --color-text-muted: #8a94a8;
      --color-text-faint: #5a6478;

      /* Category colors */
      --cat-roof: #E85D3A;
      --cat-plumbing: #3B82F6;
      --cat-electrical: #F59E0B;
      --cat-exterior: #22C55E;
      --cat-interior: #A855F7;

      /* Feedback */
      --color-correct: #22C55E;
      --color-wrong: #EF4444;
      --color-gold: #F59E0B;

      /* Spacing */
      --space-1: 0.25rem;
      --space-2: 0.5rem;
      --space-3: 0.75rem;
      --space-4: 1rem;
      --space-5: 1.25rem;
      --space-6: 1.5rem;
      --space-8: 2rem;
      --space-10: 2.5rem;
      --space-12: 3rem;
      --space-16: 4rem;

      /* Type scale */
      --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
      --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
      --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
      --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
      --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
      --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);

      /* Radius */
      --radius-sm: 0.375rem;
      --radius-md: 0.5rem;
      --radius-lg: 0.75rem;
      --radius-xl: 1rem;
      --radius-2xl: 1.5rem;
      --radius-full: 9999px;

      /* Transitions */
      --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
      --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
      --ease-in: cubic-bezier(0.4, 0, 1, 1);

      /* Shadows */
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
      --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
      --shadow-glow: 0 0 20px rgba(56,189,248,0.15);
    }

    body {
      min-height: 100dvh;
      font-family: var(--font-body);
      font-size: var(--text-base);
      color: var(--color-text);
      background: var(--color-bg);
      line-height: 1.6;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-display);
      line-height: 1.15;
      text-wrap: balance;
    }

    p { text-wrap: pretty; max-width: 72ch; }

    button {
      cursor: pointer;
      background: none;
      border: none;
      font: inherit;
      color: inherit;
    }

    input { font: inherit; color: inherit; }

    img { display: block; max-width: 100%; height: auto; }

    ::selection {
      background: rgba(56,189,248,0.25);
      color: var(--color-text);
    }

    :focus-visible {
      outline: 2px solid var(--cat-plumbing);
      outline-offset: 3px;
      border-radius: var(--radius-sm);
    }

    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }
    }

    /* ============================================
       SCREEN MANAGEMENT
       ============================================ */
    .screen {
      display: none;
      min-height: 100dvh;
      width: 100%;
    }
    .screen.active {
      display: flex;
      flex-direction: column;
      animation: screenFadeIn 0.4s var(--ease-out);
    }

    @keyframes screenFadeIn {
      from { opacity: 0; transform: translateY(10px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* ============================================
       MUTE BUTTON
       ============================================ */
    .mute-btn {
      position: fixed;
      top: var(--space-4);
      right: var(--space-4);
      z-index: 100;
      width: 44px;
      height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-full);
      color: var(--color-text-muted);
      transition: background var(--transition-interactive), color var(--transition-interactive);
    }
    @media (hover: hover) {
      .mute-btn:hover {
        background: var(--color-surface-2);
        color: var(--color-text);
      }
    }

    /* ============================================
       SCREEN 1: WELCOME
       ============================================ */
    .welcome-screen {
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: var(--space-8) var(--space-4);
      position: relative;
      overflow: hidden;
    }

    .welcome-bg {
      position: absolute;
      inset: 0;
      background: radial-gradient(ellipse at 50% 30%, rgba(56,189,248,0.08) 0%, transparent 60%),
                  radial-gradient(ellipse at 80% 70%, rgba(168,85,247,0.06) 0%, transparent 50%);
    }

    .welcome-content {
      position: relative;
      z-index: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: var(--space-6);
      max-width: 640px;
    }

    .hero-image {
      width: 100%;
      max-width: 480px;
      border-radius: var(--radius-2xl);
      box-shadow: var(--shadow-lg);
    }

    .welcome-title {
      font-size: var(--text-2xl);
      font-weight: 700;
      background: linear-gradient(135deg, #e8ecf4 0%, #93c5fd 50%, #c4b5fd 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .welcome-subtitle {
      font-family: var(--font-display);
      font-size: var(--text-lg);
      color: var(--color-text-muted);
      font-weight: 500;
    }

    .welcome-instructions {
      font-size: var(--text-sm);
      color: var(--color-text-muted);
      line-height: 1.7;
      max-width: 440px;
    }

    .start-btn {
      display: inline-flex;
      align-items: center;
      gap: var(--space-2);
      padding: var(--space-4) var(--space-10);
      font-family: var(--font-display);
      font-size: var(--text-lg);
      font-weight: 600;
      color: #fff;
      background: linear-gradient(135deg, var(--cat-roof) 0%, #d94080 100%);
      border-radius: var(--radius-full);
      box-shadow: 0 4px 20px rgba(232,93,58,0.4);
      transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
    }
    @media (hover: hover) {
      .start-btn:hover {
        transform: translateY(-2px) scale(1.02);
        box-shadow: 0 6px 28px rgba(232,93,58,0.5);
      }
    }
    .start-btn:active {
      transform: translateY(0) scale(0.98);
    }

    .branding {
      font-size: var(--text-xs);
      color: var(--color-text-faint);
      margin-top: var(--space-4);
    }
    .branding a {
      color: var(--color-text-muted);
      text-decoration: underline;
      text-decoration-color: rgba(138,148,168,0.3);
      transition: color var(--transition-interactive);
    }
    @media (hover: hover) {
      .branding a:hover { color: var(--color-text); }
    }

    /* ============================================
       SCREEN 2: GAME BOARD
       ============================================ */
    .board-screen {
      padding: var(--space-4);
      padding-top: var(--space-6);
      padding-right: calc(var(--space-4) + 52px);
    }

    .board-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: var(--space-6);
      flex-wrap: wrap;
      gap: var(--space-3);
    }

    .board-title {
      font-size: var(--text-lg);
      font-weight: 600;
      color: var(--color-text);
    }

    .board-stats {
      display: flex;
      align-items: center;
      gap: var(--space-6);
    }

    .stat-item {
      display: flex;
      align-items: center;
      gap: var(--space-2);
      font-size: var(--text-sm);
      color: var(--color-text-muted);
    }

    .stat-value {
      font-family: var(--font-display);
      font-weight: 700;
      font-size: var(--text-lg);
      color: var(--color-text);
      font-variant-numeric: tabular-nums lining-nums;
    }

    .score-value { color: var(--color-gold); }

    .finish-btn {
      padding: var(--space-2) var(--space-4);
      font-size: var(--text-sm);
      font-weight: 600;
      color: var(--color-text-muted);
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-full);
      transition: background var(--transition-interactive), color var(--transition-interactive);
    }
    @media (hover: hover) {
      .finish-btn:hover {
        background: var(--color-surface-2);
        color: var(--color-text);
      }
    }

    /* ============================================
       JEOPARDY-STYLE BOARD
       ============================================ */
    .game-board {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 4px;
      max-width: 960px;
      margin: 0 auto;
      width: 100%;
      background: #000;
      border: 6px solid #000;
      border-radius: 4px;
      overflow: hidden;
    }

    /* Category headers — top row */
    .category-header {
      text-align: center;
      padding: var(--space-3) var(--space-2);
      background: #0a1a6b;
      position: relative;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 72px;
    }

    .category-header .cat-icon {
      display: none;
    }

    .category-header .cat-name {
      font-family: var(--font-display);
      font-size: clamp(0.7rem, 0.5rem + 1.2vw, 1rem);
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      color: #fff;
      text-shadow: 2px 2px 4px rgba(0,0,0,0.7);
      line-height: 1.2;
    }

    .category-complete-badge {
      display: none;
      font-size: 0.65rem;
      position: absolute;
      top: 4px;
      right: 6px;
    }
    .category-header.completed .category-complete-badge {
      display: block;
    }

    /* Tiles — the classic blue with gold values */
    .tile {
      position: relative;
      padding: var(--space-2) var(--space-1);
      text-align: center;
      background: #0a1a6b;
      font-family: var(--font-display);
      font-size: clamp(1.5rem, 1.2rem + 2.5vw, 2.5rem);
      font-weight: 800;
      color: #d4a843;
      text-shadow:
        3px 3px 0px rgba(0,0,0,0.5),
        1px 1px 0px rgba(0,0,0,0.3);
      transition: transform var(--transition-interactive),
                  box-shadow var(--transition-interactive),
                  background var(--transition-interactive),
                  filter var(--transition-interactive);
      min-height: 72px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .tile .tile-points::before {
      content: '$';
    }

    @media (hover: hover) {
      .tile:not(.answered):hover {
        background: #1a2ea0;
        transform: scale(1.03);
        box-shadow: 0 0 16px rgba(212,168,67,0.25);
        z-index: 2;
      }
    }

    .tile:not(.answered):active {
      transform: scale(0.97);
    }

    .tile.answered {
      background: #060e3a;
      color: transparent;
      text-shadow: none;
      cursor: default;
      pointer-events: none;
    }
    .tile.answered::after {
      content: '\2713';
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      font-size: 1.5rem;
      color: rgba(34,197,94,0.3);
      text-shadow: none;
    }
    .tile.answered .tile-points {
      opacity: 0;
    }

    /* Board intro reveal animation */
    .category-header.reveal-hidden {
      opacity: 0.2;
      filter: brightness(0.3);
      transition: opacity 0.4s ease, filter 0.4s ease, transform 0.4s ease;
    }
    .category-header.reveal-active {
      opacity: 1;
      filter: brightness(1);
      transform: scale(1.08);
      box-shadow: 0 0 24px rgba(212,168,67,0.5);
      transition: opacity 0.3s ease, filter 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    }
    .category-header.reveal-done {
      opacity: 1;
      filter: brightness(1);
      transform: scale(1);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .tile.reveal-hidden {
      opacity: 0;
      transform: scale(0.8);
      transition: opacity 0.3s ease, transform 0.3s ease;
    }
    .tile.reveal-show {
      opacity: 1;
      transform: scale(1);
    }
    .board-intro-overlay {
      position: fixed;
      bottom: var(--space-8);
      left: 50%;
      transform: translateX(-50%);
      font-family: var(--font-display);
      font-size: var(--text-sm);
      color: var(--color-text-muted);
      opacity: 0;
      transition: opacity 0.3s ease;
      pointer-events: none;
      z-index: 50;
    }
    .board-intro-overlay.visible {
      opacity: 1;
    }

    /* ============================================
       SCREEN 3: QUESTION
       ============================================ */
    .question-screen {
      align-items: center;
      justify-content: center;
      padding: var(--space-6) var(--space-4);
      padding-bottom: 100px; /* room for podium */
    }

    .question-container {
      max-width: 640px;
      width: 100%;
      display: flex;
      flex-direction: column;
      gap: var(--space-6);
    }

    .question-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .question-badge {
      display: inline-flex;
      align-items: center;
      gap: var(--space-2);
      padding: var(--space-2) var(--space-4);
      border-radius: var(--radius-full);
      font-family: var(--font-display);
      font-size: var(--text-sm);
      font-weight: 600;
      color: #fff;
    }

    .question-points {
      font-family: var(--font-display);
      font-size: var(--text-lg);
      font-weight: 700;
      color: var(--color-gold);
    }

    /* Timer bar */
    .timer-bar-container {
      width: 100%;
      height: 6px;
      background: rgba(255,255,255,0.08);
      border-radius: var(--radius-full);
      overflow: hidden;
      transition: opacity 0.3s ease;
    }
    .timer-bar {
      height: 100%;
      width: 100%;
      border-radius: var(--radius-full);
      background: var(--color-correct);
      transition: width 0.1s linear, background 0.3s ease;
    }
    .timer-bar.warning { background: var(--color-gold); }
    .timer-bar.danger { background: var(--color-wrong); }

    .question-text {
      font-family: var(--font-display);
      font-size: var(--text-xl);
      font-weight: 600;
      text-align: center;
      line-height: 1.3;
    }

    .choices {
      display: flex;
      flex-direction: column;
      gap: var(--space-3);
    }

    .choice-btn {
      display: flex;
      align-items: center;
      gap: var(--space-4);
      padding: var(--space-4) var(--space-5);
      background: var(--color-surface);
      border: 2px solid var(--color-border);
      border-radius: var(--radius-xl);
      text-align: left;
      font-size: var(--text-base);
      font-weight: 500;
      color: var(--color-text);
      transition: transform var(--transition-interactive),
                  border-color var(--transition-interactive),
                  background var(--transition-interactive),
                  box-shadow var(--transition-interactive);
      min-height: 56px;
    }

    .choice-letter {
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-md);
      font-family: var(--font-display);
      font-weight: 700;
      font-size: var(--text-sm);
      background: rgba(255,255,255,0.08);
      flex-shrink: 0;
    }

    @media (hover: hover) {
      .choice-btn:not(.disabled):hover {
        transform: translateY(-2px);
        border-color: rgba(255,255,255,0.25);
        background: var(--color-surface-2);
        box-shadow: var(--shadow-md);
      }
    }
    .choice-btn:not(.disabled):active {
      transform: scale(0.98);
    }

    .choice-btn.correct {
      border-color: var(--color-correct);
      background: rgba(34,197,94,0.12);
    }
    .choice-btn.correct .choice-letter {
      background: var(--color-correct);
      color: #fff;
    }
    .choice-btn.wrong {
      border-color: var(--color-wrong);
      background: rgba(239,68,68,0.12);
      animation: shake 0.5s ease;
    }
    .choice-btn.disabled {
      pointer-events: none;
      opacity: 0.6;
    }

    /* Player podium */
    .player-podium {
      position: fixed;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: min(320px, 90vw);
      text-align: center;
      z-index: 30;
      pointer-events: none;
    }
    .podium-body {
      background: linear-gradient(180deg, #1a2744 0%, #0e1a33 100%);
      border: 2px solid rgba(212,168,67,0.35);
      border-bottom: none;
      border-radius: 12px 12px 0 0;
      padding: var(--space-3) var(--space-5) var(--space-2);
      box-shadow: 0 -4px 20px rgba(0,0,0,0.4);
    }
    .podium-name {
      font-family: var(--font-display);
      font-size: var(--text-sm);
      font-weight: 600;
      color: #fff;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      margin-bottom: 2px;
    }
    .podium-score {
      font-family: var(--font-display);
      font-size: var(--text-xl);
      font-weight: 800;
      color: var(--color-gold);
      text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
    }
    .podium-score::before { content: '$'; }
    .podium-body.buzzed {
      border-color: rgba(212,168,67,0.8);
      box-shadow: 0 -4px 30px rgba(212,168,67,0.3), 0 0 15px rgba(212,168,67,0.15);
    }

    /* Buzz-in button */
    .buzz-in-wrap {
      display: flex;
      justify-content: center;
      margin-top: var(--space-4);
    }
    .buzz-in-btn {
      position: relative;
      width: 140px;
      height: 140px;
      border-radius: 50%;
      border: 4px solid rgba(212,168,67,0.6);
      background: radial-gradient(circle at 40% 35%, #c9363c, #8b1a1f 70%);
      color: #fff;
      font-family: var(--font-display);
      font-size: var(--text-base);
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      cursor: pointer;
      box-shadow:
        0 6px 20px rgba(0,0,0,0.5),
        inset 0 2px 4px rgba(255,255,255,0.15),
        inset 0 -3px 6px rgba(0,0,0,0.3);
      transition: transform 0.1s ease, box-shadow 0.1s ease;
      animation: buzzPulse 1.5s ease-in-out infinite;
      text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
    }
    .buzz-in-btn:hover {
      transform: scale(1.05);
      box-shadow:
        0 8px 25px rgba(0,0,0,0.5),
        0 0 20px rgba(201,54,60,0.3),
        inset 0 2px 4px rgba(255,255,255,0.15);
    }
    .buzz-in-btn:active {
      transform: scale(0.95);
      box-shadow:
        0 2px 10px rgba(0,0,0,0.5),
        inset 0 2px 8px rgba(0,0,0,0.4);
      animation: none;
    }
    @keyframes buzzPulse {
      0%, 100% { box-shadow: 0 6px 20px rgba(0,0,0,0.5), inset 0 2px 4px rgba(255,255,255,0.15), 0 0 0 0 rgba(212,168,67,0); }
      50% { box-shadow: 0 6px 20px rgba(0,0,0,0.5), inset 0 2px 4px rgba(255,255,255,0.15), 0 0 0 12px rgba(212,168,67,0.15); }
    }
    .choices.hidden-choices {
      opacity: 0;
      max-height: 0;
      overflow: hidden;
      margin: 0;
      transition: opacity 0.3s ease, max-height 0.3s ease;
    }
    .choices.show-choices {
      opacity: 1;
      max-height: 600px;
      transition: opacity 0.3s ease, max-height 0.4s ease;
    }
    .buzz-in-wrap.hidden { display: none; }
    .player-podium.hidden { display: none; }

    /* Homer host mascot */
    .homer-host {
      position: fixed;
      bottom: 12px;
      right: 12px;
      width: clamp(90px, 14vw, 150px);
      z-index: 25;
      pointer-events: none;
      opacity: 0;
      transform: translateY(20px) scale(0.9);
      transition: opacity 0.4s var(--ease-out), transform 0.4s var(--ease-out);
    }
    .homer-host.visible {
      opacity: 1;
      transform: translateY(0) scale(1);
    }
    .homer-host.homer-pop {
      animation: homerPop 0.5s var(--ease-out);
    }
    @keyframes homerPop {
      0% { transform: scale(0.7); }
      50% { transform: scale(1.1); }
      100% { transform: scale(1); }
    }
    .homer-host img {
      width: 100%;
      height: auto;
      display: block;
      filter: drop-shadow(0 4px 12px rgba(0,0,0,0.4));
    }
    /* Shift Homer left when podium is visible so they don't overlap */
    .homer-host.with-podium {
      right: auto;
      left: 12px;
    }
    @media (min-width: 768px) {
      .homer-host {
        bottom: 20px;
        right: 24px;
      }
      .homer-host.with-podium {
        right: auto;
        left: 24px;
      }
    }

    @keyframes shake {
      0%, 100% { transform: translateX(0); }
      20% { transform: translateX(-8px); }
      40% { transform: translateX(8px); }
      60% { transform: translateX(-4px); }
      80% { transform: translateX(4px); }
    }

    .back-to-board {
      text-align: center;
      font-size: var(--text-xs);
      color: var(--color-text-faint);
      text-decoration: underline;
      transition: color var(--transition-interactive);
    }
    @media (hover: hover) {
      .back-to-board:hover { color: var(--color-text-muted); }
    }

    /* ============================================
       SCREEN 4: ANSWER REVEAL
       ============================================ */
    .reveal-screen {
      align-items: center;
      justify-content: center;
      padding: var(--space-8) var(--space-4);
      padding-bottom: 100px; /* room for podium */
    }

    .reveal-container {
      max-width: 540px;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: var(--space-6);
      text-align: center;
    }

    .reveal-icon {
      width: 80px;
      height: 80px;
      border-radius: var(--radius-full);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2.5rem;
    }
    .reveal-icon.correct {
      background: rgba(34,197,94,0.15);
      color: var(--color-correct);
      animation: popIn 0.4s var(--ease-out);
    }
    .reveal-icon.wrong {
      background: rgba(239,68,68,0.15);
      color: var(--color-wrong);
      animation: popIn 0.4s var(--ease-out);
    }

    @keyframes popIn {
      0% { transform: scale(0.5); opacity: 0; }
      60% { transform: scale(1.15); }
      100% { transform: scale(1); opacity: 1; }
    }

    .reveal-title {
      font-size: var(--text-xl);
      font-weight: 700;
    }
    .reveal-title.correct { color: var(--color-correct); }
    .reveal-title.wrong { color: var(--color-wrong); }

    .reveal-points {
      font-family: var(--font-display);
      font-size: var(--text-lg);
      font-weight: 700;
      color: var(--color-gold);
    }

    .reveal-answer {
      padding: var(--space-4);
      background: var(--color-surface);
      border-radius: var(--radius-lg);
      border: 1px solid var(--color-border);
      width: 100%;
    }
    .reveal-answer-label {
      font-size: var(--text-xs);
      color: var(--color-text-muted);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: var(--space-2);
    }
    .reveal-answer-text {
      font-weight: 600;
      color: var(--color-correct);
    }

    .reveal-explanation {
      padding: var(--space-4);
      background: rgba(56,189,248,0.06);
      border: 1px solid rgba(56,189,248,0.12);
      border-radius: var(--radius-lg);
      font-size: var(--text-sm);
      color: var(--color-text-muted);
      line-height: 1.7;
      width: 100%;
      text-align: left;
    }
    .reveal-explanation strong {
      color: var(--color-text);
      font-weight: 600;
    }

    .continue-btn {
      display: inline-flex;
      align-items: center;
      gap: var(--space-2);
      padding: var(--space-3) var(--space-8);
      font-family: var(--font-display);
      font-size: var(--text-base);
      font-weight: 600;
      color: #fff;
      background: linear-gradient(135deg, var(--cat-plumbing) 0%, #6366f1 100%);
      border-radius: var(--radius-full);
      box-shadow: 0 4px 16px rgba(59,130,246,0.3);
      transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
    }
    @media (hover: hover) {
      .continue-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 24px rgba(59,130,246,0.4);
      }
    }
    .continue-btn:active { transform: translateY(0) scale(0.97); }

    /* Confetti */
    .confetti-container {
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: 200;
      overflow: hidden;
    }
    .confetti-piece {
      position: absolute;
      width: 10px;
      height: 10px;
      border-radius: 2px;
      animation: confettiFall 2s var(--ease-out) forwards;
    }
    @keyframes confettiFall {
      0% { transform: translateY(-20px) rotate(0deg) scale(1); opacity: 1; }
      100% { transform: translateY(100vh) rotate(720deg) scale(0.5); opacity: 0; }
    }

    /* ============================================
       SCREEN 5: RESULTS
       ============================================ */
    .results-screen {
      align-items: center;
      padding: var(--space-8) var(--space-4);
    }

    .results-container {
      max-width: 600px;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: var(--space-8);
    }

    .results-celebration-img {
      width: 100%;
      max-width: 400px;
      border-radius: var(--radius-2xl);
      box-shadow: var(--shadow-lg);
    }

    .results-score {
      text-align: center;
    }
    .results-score-number {
      font-family: var(--font-display);
      font-size: var(--text-2xl);
      font-weight: 700;
      color: var(--color-gold);
      font-variant-numeric: tabular-nums lining-nums;
    }
    .results-score-label {
      font-size: var(--text-sm);
      color: var(--color-text-muted);
    }

    .grade-badge {
      display: inline-flex;
      align-items: center;
      gap: var(--space-2);
      padding: var(--space-3) var(--space-6);
      border-radius: var(--radius-full);
      font-family: var(--font-display);
      font-size: var(--text-xl);
      font-weight: 700;
      background: linear-gradient(135deg, rgba(245,158,11,0.2) 0%, rgba(168,85,247,0.2) 100%);
      border: 2px solid var(--color-gold);
      color: var(--color-gold);
    }

    .category-breakdown {
      width: 100%;
      display: flex;
      flex-direction: column;
      gap: var(--space-4);
    }

    .category-bar-row {
      display: flex;
      align-items: center;
      gap: var(--space-3);
    }
    .category-bar-label {
      width: 90px;
      font-size: var(--text-sm);
      font-weight: 600;
      flex-shrink: 0;
    }
    .category-bar-track {
      flex: 1;
      height: 24px;
      background: rgba(255,255,255,0.06);
      border-radius: var(--radius-full);
      overflow: hidden;
    }
    .category-bar-fill {
      height: 100%;
      border-radius: var(--radius-full);
      transition: width 1s var(--ease-out);
      display: flex;
      align-items: center;
      justify-content: flex-end;
      padding-right: var(--space-2);
      font-size: var(--text-xs);
      font-weight: 700;
      color: #fff;
      min-width: 40px;
    }
    .category-bar-score {
      width: 70px;
      text-align: right;
      font-size: var(--text-sm);
      font-weight: 600;
      color: var(--color-text-muted);
      font-variant-numeric: tabular-nums lining-nums;
      flex-shrink: 0;
    }

    .results-summary {
      text-align: center;
      font-size: var(--text-sm);
      color: var(--color-text-muted);
      line-height: 1.7;
      padding: var(--space-4);
      background: var(--color-surface);
      border-radius: var(--radius-lg);
      border: 1px solid var(--color-border);
    }

    .results-cta-section {
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: var(--space-4);
    }

    .results-cta-title {
      font-size: var(--text-lg);
      font-weight: 600;
    }

    .cta-btn {
      display: inline-flex;
      align-items: center;
      gap: var(--space-2);
      padding: var(--space-4) var(--space-8);
      font-family: var(--font-display);
      font-size: var(--text-base);
      font-weight: 600;
      color: #fff;
      background: linear-gradient(135deg, var(--cat-roof) 0%, #d94080 100%);
      border-radius: var(--radius-full);
      box-shadow: 0 4px 20px rgba(232,93,58,0.4);
      text-decoration: none;
      transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
    }
    @media (hover: hover) {
      .cta-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 6px 28px rgba(232,93,58,0.5);
      }
    }
    .cta-btn:active { transform: translateY(0) scale(0.97); }

    .lead-btn {
      padding: var(--space-3) var(--space-6);
      font-family: var(--font-display);
      font-size: var(--text-sm);
      font-weight: 600;
      color: var(--color-text);
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-full);
      transition: background var(--transition-interactive), border-color var(--transition-interactive);
    }
    @media (hover: hover) {
      .lead-btn:hover {
        background: var(--color-surface-2);
        border-color: rgba(255,255,255,0.2);
      }
    }

    /* ============================================
       SCREEN 6: LEAD CAPTURE
       ============================================ */
    .lead-screen {
      align-items: center;
      justify-content: center;
      padding: var(--space-8) var(--space-4);
    }

    .lead-container {
      max-width: 480px;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: var(--space-6);
      text-align: center;
    }

    .lead-title {
      font-size: var(--text-xl);
      font-weight: 700;
    }
    .lead-subtitle {
      font-size: var(--text-sm);
      color: var(--color-text-muted);
    }

    .lead-form {
      width: 100%;
      display: flex;
      flex-direction: column;
      gap: var(--space-4);
    }

    .form-field {
      width: 100%;
    }
    .form-field label {
      display: block;
      font-size: var(--text-sm);
      font-weight: 600;
      margin-bottom: var(--space-2);
      text-align: left;
    }
    .form-field input {
      width: 100%;
      padding: var(--space-3) var(--space-4);
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      color: var(--color-text);
      font-size: var(--text-base);
      transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
    }
    .form-field input::placeholder {
      color: var(--color-text-faint);
    }
    .form-field input:focus {
      outline: none;
      border-color: var(--cat-plumbing);
      box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
    }

    .checkbox-field {
      display: flex;
      align-items: flex-start;
      gap: var(--space-3);
      text-align: left;
    }
    .checkbox-field input[type="checkbox"] {
      width: 20px;
      height: 20px;
      margin-top: 2px;
      flex-shrink: 0;
      accent-color: var(--cat-plumbing);
    }
    .checkbox-field label {
      font-size: var(--text-sm);
      color: var(--color-text-muted);
      cursor: pointer;
    }

    .form-submit-btn {
      width: 100%;
      padding: var(--space-4);
      font-family: var(--font-display);
      font-size: var(--text-base);
      font-weight: 600;
      color: #fff;
      background: linear-gradient(135deg, var(--cat-plumbing) 0%, #6366f1 100%);
      border-radius: var(--radius-lg);
      box-shadow: 0 4px 16px rgba(59,130,246,0.3);
      transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
    }
    @media (hover: hover) {
      .form-submit-btn:hover {
        transform: translateY(-1px);
        box-shadow: 0 6px 24px rgba(59,130,246,0.4);
      }
    }
    .form-submit-btn:active { transform: translateY(0); }

    .thank-you {
      display: none;
      flex-direction: column;
      align-items: center;
      gap: var(--space-4);
    }
    .thank-you.active { display: flex; }
    .thank-you-icon {
      width: 80px;
      height: 80px;
      background: rgba(34,197,94,0.15);
      border-radius: var(--radius-full);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2.5rem;
      animation: popIn 0.4s var(--ease-out);
    }

    .thank-you-success {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    /* CTA Card — secondary beat */
    .thank-you-cta {
      opacity: 0;
      transform: translateY(16px);
      transition: opacity 0.6s ease, transform 0.6s ease;
      width: 100%;
      max-width: 440px;
    }
    .thank-you-cta.visible {
      opacity: 1;
      transform: translateY(0);
    }
    .cta-card {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--radius-lg);
      padding: var(--space-5) var(--space-4);
      text-align: center;
    }
    .cta-card-headline {
      font-family: var(--font-display);
      font-weight: 700;
      font-size: var(--text-base);
      color: var(--color-text);
      margin-bottom: var(--space-2);
    }
    .cta-card-subtext {
      font-size: var(--text-sm);
      color: var(--color-text-muted);
      margin-bottom: var(--space-4);
    }
    .cta-card .form-submit-btn {
      display: inline-block;
      text-decoration: none;
      text-align: center;
      font-size: var(--text-sm);
      padding: var(--space-3) var(--space-5);
    }

    .cta-redirect-notice {
      margin-top: var(--space-3);
      font-size: var(--text-xs);
      color: var(--color-text-muted);
      text-align: center;
      opacity: 0.85;
      font-family: var(--font-body);
    }

    .cta-redirect-notice #redirectCountdown {
      font-weight: 700;
      color: var(--color-accent);
    }

    /* ============================================
       SCORE ANIMATION
       ============================================ */
    .floating-score {
      position: fixed;
      z-index: 150;
      font-family: var(--font-display);
      font-size: var(--text-xl);
      font-weight: 700;
      color: var(--color-gold);
      pointer-events: none;
      animation: floatUp 1.2s var(--ease-out) forwards;
    }
    @keyframes floatUp {
      0% { opacity: 1; transform: translateY(0) scale(1); }
      100% { opacity: 0; transform: translateY(-60px) scale(1.3); }
    }

    /* ============================================
       MOBILE RESPONSIVE
       ============================================ */
    @media (max-width: 700px) {
      .board-screen {
        padding: var(--space-3);
        padding-top: var(--space-4);
        padding-right: var(--space-3);
      }

      .game-board {
        gap: 3px;
        border-width: 4px;
      }

      .category-header {
        padding: var(--space-2) 2px;
        min-height: 48px;
      }
      .category-header .cat-name { font-size: 0.55rem; letter-spacing: 0.02em; }

      .tile {
        padding: var(--space-1) 2px;
        font-size: clamp(0.85rem, 0.7rem + 1.5vw, 1.2rem);
        min-height: 48px;
      }

      .board-header {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: var(--space-3);
      }
      .board-stats { width: 100%; justify-content: space-between; }
    }

    @media (max-width: 400px) {
      .question-text { font-size: var(--text-lg); }
      .choice-btn { padding: var(--space-3) var(--space-4); }
    }
/* ============================================
   HOW TO PLAY OVERLAY
   ============================================ */
.how-to-play-btn {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.6);
  padding: 8px 20px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 4px;
}
.how-to-play-btn:hover {
  color: #fff;
  border-color: rgba(255,255,255,0.4);
}

.how-to-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.how-to-overlay.active {
  display: flex;
}
.how-to-panel {
  background: var(--bg-primary);
  border-radius: 16px;
  padding: 32px;
  max-width: 520px;
  width: 100%;
  position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.how-to-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px 8px;
}
.how-to-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 24px;
}
.how-to-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}
.how-to-step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.how-to-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}
.how-to-step p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0;
}
.how-to-step strong {
  color: #fff;
}
.how-to-got-it {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease;
}
.how-to-got-it:hover {
  background: #d14e2a;
}