@layer reset, base, theme, components, utilities;

@layer reset {
  html, body, header, nav, main, aside, section, article, div, h1, h2, h3, p, ul, ol, li,
  table, caption, thead, tbody, tr, th, td, dialog, form, fieldset, legend, label, input,
  select, button, output, canvas, kbd {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
}

@layer theme {
  :root {
    color-scheme: dark;

    /* Tier 1 & 2 Neon Obsidian Glass Tokens */
    --bg-void: #050812;
    --bg-panel: rgba(12, 18, 34, 0.88);
    --bg-card: rgba(20, 29, 54, 0.78);
    --bg-card-hover: rgba(31, 45, 82, 0.9);
    --border-glass: rgba(96, 165, 250, 0.24);
    --border-bright: rgba(0, 229, 255, 0.65);

    --text-primary: #f1f5ff;
    --text-muted: #9eb0cf;
    --accent-cyan: #00e5ff;
    --accent-magenta: #ff2e93;
    --accent-gold: #ffd13b;
    --accent-emerald: #2ee69b;
    --accent-danger: #ff4d6d;

    --font-display: 'Impact', 'Arial Black', system-ui, sans-serif;
    --font-mono: ui-monospace, 'Cascadia Mono', 'SFMono-Regular', Menlo, Consolas, monospace;
    --font-ui: system-ui, -apple-system, 'Segoe UI', sans-serif;

    accent-color: var(--accent-cyan);
    scrollbar-color: #364b75 #0a1020;
  }

  @media (forced-colors: active) {
    :root {
      --bg-void: Canvas;
      --bg-panel: Canvas;
      --bg-card: Canvas;
      --border-glass: ButtonBorder;
      --border-bright: Highlight;
      --text-primary: CanvasText;
      --text-muted: GrayText;
      --accent-cyan: Highlight;
      --accent-gold: Highlight;
    }
  }
}

@layer base {
  body {
    background: radial-gradient(circle at 50% 45%, #0d162e 0%, #050812 74%);
    color: var(--text-primary);
    font-family: var(--font-ui);
    min-block-size: 100dvh;
    inline-size: 100%;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
  }

  button {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-primary);
    background-color: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: 6px;
    min-block-size: 28px;
    min-inline-size: 28px;
    padding-block: 0.3rem;
    padding-inline: 0.6rem;
    cursor: pointer;
    transition: background-color 0.14s ease, border-color 0.14s ease, transform 0.08s ease;
  }

  button:hover:not(:disabled) {
    background-color: var(--bg-card-hover);
    border-color: var(--accent-cyan);
  }

  button:active:not(:disabled) {
    transform: translateY(1px);
  }

  button.primary {
    background: linear-gradient(135deg, #0077b6, #00a8e8);
    border-color: var(--accent-cyan);
    color: #03101c;
  }

  button.primary:hover:not(:disabled) {
    background: linear-gradient(135deg, #0096c7, #38e8ff);
    border-color: #ffffff;
  }

  button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
  }

  :where(a:any-link, button, input, select, summary):focus-visible {
    outline: 3px solid var(--accent-gold);
    outline-offset: 2px;
  }

  kbd {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--accent-gold);
    background-color: rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(255, 209, 59, 0.35);
    border-radius: 4px;
    padding-inline: 0.28rem;
    padding-block: 0.04rem;
  }

  canvas {
    display: block;
  }
}

@layer components {
  .top-command-bar {
    inline-size: 100%;
    min-block-size: 44px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding-block: 0.35rem;
    padding-inline: 0.9rem;
    background-color: var(--bg-panel);
    border-block-end: 1px solid var(--border-glass);
    backdrop-filter: blur(10px);
  }

  .brand-cluster {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  .brand-cluster h1 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    letter-spacing: 0.08em;
    color: var(--accent-cyan);
    text-shadow: 0 0 14px rgba(0, 229, 255, 0.45);
  }

  .mode-badge {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--accent-gold);
    background-color: rgba(255, 209, 59, 0.12);
    border: 1px solid rgba(255, 209, 59, 0.32);
    border-radius: 999px;
    padding-block: 0.14rem;
    padding-inline: 0.6rem;
  }

  .toolbar-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
  }

  .toggle-pill[aria-pressed="true"] {
    background-color: rgba(0, 229, 255, 0.16);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
  }

  /* Main 3-Column Arcade Cockpit */
  .arena-stage {
    flex: 1 1 auto;
    inline-size: 100%;
    block-size: calc(100dvh - 44px);
    display: grid;
    grid-template-columns: minmax(210px, 260px) minmax(320px, 1fr) minmax(230px, 280px);
    gap: 0.75rem;
    padding: 0.65rem 0.9rem;
    align-items: stretch;
    overflow: hidden;
  }

  .hud-panel {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    padding: 0.7rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    backdrop-filter: blur(12px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 12px 32px rgba(0, 0, 0, 0.45);
    min-block-size: 0;
  }

  .stat-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.45rem;
  }

  .stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 0.42rem 0.55rem;
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
  }

  .stat-card.stat-highlight {
    grid-column: span 2;
    border-color: rgba(0, 229, 255, 0.45);
    background: linear-gradient(135deg, rgba(0, 229, 255, 0.12), rgba(20, 29, 54, 0.86));
  }

  .stat-label {
    font-family: var(--font-mono);
    font-size: 0.64rem;
    letter-spacing: 0.08em;
    color: var(--text-muted);
  }

  .stat-value {
    font-family: var(--font-mono);
    font-size: 1.05rem;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
  }

  .stat-highlight .stat-value {
    font-size: 1.45rem;
    color: var(--accent-cyan);
  }

  .panel-heading-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.4rem;
  }

  .hud-panel h2 {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.09em;
    color: var(--accent-gold);
  }

  .depth-readout,
  .piece-name-tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--accent-cyan);
    font-weight: 700;
  }

  .depth-meter-panel {
    flex: 1 1 auto;
    min-block-size: 0;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
  }

  .depth-bars {
    list-style: none;
    flex: 1 1 auto;
    min-block-size: 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.22rem;
    padding-inline-end: 0.15rem;
  }

  .depth-bar-row {
    display: grid;
    grid-template-columns: 28px 1fr 34px;
    align-items: center;
    gap: 0.35rem;
    font-family: var(--font-mono);
    font-size: 0.66rem;
    color: var(--text-muted);
  }

  .depth-track {
    block-size: 10px;
    border-radius: 4px;
    background-color: rgba(6, 10, 20, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.12);
    overflow: hidden;
  }

  .depth-fill {
    block-size: 100%;
    inline-size: var(--fill-pct, 0%);
    background-color: var(--layer-color, var(--accent-cyan));
    transition: inline-size 0.14s ease;
  }

  /* Center 3D Pit Canvas */
  .pit-viewport {
    position: relative;
    min-inline-size: 0;
    min-block-size: 0;
    border-radius: 14px;
    border: 1px solid var(--border-glass);
    background: radial-gradient(circle at 50% 50%, #091124 0%, #03060f 100%);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 0 48px rgba(0, 229, 255, 0.08), 0 16px 40px rgba(0, 0, 0, 0.6);
  }

  #pit-canvas {
    inline-size: 100%;
    block-size: 100%;
    touch-action: none;
    cursor: grab;
  }

  #pit-canvas:active {
    cursor: grabbing;
  }

  .camera-hint {
    position: absolute;
    inset-block-end: 0.55rem;
    inset-inline: 0.75rem;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    color: var(--text-muted);
    pointer-events: none;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.9);
  }

  .canvas-status-overlay {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    background-color: rgba(4, 7, 16, 0.72);
    backdrop-filter: blur(6px);
    padding: 1rem;
  }

  .canvas-status-overlay[hidden] {
    display: none;
  }

  .overlay-card {
    background-color: rgba(13, 20, 40, 0.95);
    border: 1px solid var(--border-bright);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    max-inline-size: 360px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.75);
  }

  .overlay-card h2 {
    font-family: var(--font-display);
    letter-spacing: 0.06em;
    font-size: 1.35rem;
    color: var(--accent-cyan);
  }

  .overlay-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.45;
  }

  .overlay-actions {
    display: flex;
    justify-content: center;
    gap: 0.55rem;
    flex-wrap: wrap;
  }

  /* Right Preview & Tactile Control Deck */
  .next-preview-panel {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
  }

  .next-canvas-wrap {
    border-radius: 10px;
    border: 1px solid var(--border-glass);
    background: radial-gradient(circle at 50% 45%, #111c3a 0%, #060a16 100%);
    overflow: hidden;
    aspect-ratio: 22 / 17;
  }

  #next-canvas {
    inline-size: 100%;
    block-size: 100%;
  }

  .active-piece-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
  }

  .active-piece-meta strong {
    color: var(--text-primary);
  }

  .control-deck {
    margin-block-start: auto;
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
  }

  .rot-pad-grid,
  .move-pad-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.35rem;
  }

  .ctrl-btn {
    min-block-size: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    font-size: 0.72rem;
    padding-inline: 0.35rem;
  }

  .ctrl-btn.is-active {
    background-color: rgba(0, 229, 255, 0.25);
    border-color: var(--accent-cyan);
    color: #ffffff;
  }

  .ctrl-btn.rot-x { border-block-end: 2px solid #ff5c8a; }
  .ctrl-btn.rot-y { border-block-end: 2px solid #2ee69b; }
  .ctrl-btn.rot-z { border-block-end: 2px solid #00e5ff; }

  .drop-btn {
    min-block-size: 42px;
    font-size: 0.82rem;
    letter-spacing: 0.06em;
  }

  /* Native Modal Dialogs */
  dialog {
    margin: auto;
    background-color: #0e1528;
    color: var(--text-primary);
    border: 1px solid var(--border-bright);
    border-radius: 12px;
    padding: 1.25rem;
    max-inline-size: 720px;
    inline-size: min(92vw, 720px);
    max-block-size: 88dvh;
    overflow-y: auto;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.85);
  }

  dialog:modal {
    overscroll-behavior: contain;
  }

  dialog::backdrop {
    background-color: rgba(4, 7, 16, 0.78);
    backdrop-filter: blur(5px);
    overflow: hidden;
    overscroll-behavior: contain;
  }

  .dialog-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    border-block-end: 1px solid var(--border-glass);
    padding-block-end: 0.65rem;
    margin-block-end: 0.9rem;
  }

  .dialog-header h2 {
    font-family: var(--font-display);
    font-size: 1.22rem;
    letter-spacing: 0.05em;
    color: var(--accent-cyan);
  }

  /* Setup Form & Presets */
  .setup-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }

  .preset-fieldset {
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 0.75rem;
  }

  .preset-fieldset legend {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-gold);
    padding-inline: 0.4rem;
  }

  .preset-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(145px, 1fr));
    gap: 0.5rem;
  }

  .preset-card {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    padding: 0.55rem 0.65rem;
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    background-color: var(--bg-card);
    cursor: pointer;
  }

  .preset-card:has(:checked) {
    border-color: var(--accent-cyan);
    background-color: rgba(0, 229, 255, 0.14);
  }

  .preset-title {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.82rem;
    color: var(--text-primary);
  }

  .preset-desc {
    font-size: 0.72rem;
    color: var(--text-muted);
  }

  .form-two-col,
  .sliders-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 0.75rem;
  }

  .field-group {
    display: flex;
    flex-direction: column;
    gap: 0.32rem;
  }

  .field-group label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
  }

  .field-group output {
    color: var(--accent-cyan);
    font-weight: 700;
  }

  /* Branded Select with Graceful Standard Fallback */
  .branded-select {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--text-primary);
    background-color: #131c36;
    border: 1px solid var(--border-glass);
    border-radius: 6px;
    padding: 0.45rem 0.6rem;
    inline-size: 100%;
    cursor: pointer;
  }

  @supports (appearance: base-select) {
    .branded-select,
    .branded-select::picker(select) {
      appearance: base-select;
    }

    .branded-select::picker(select) {
      background-color: #111932;
      color: var(--text-primary);
      border: 1px solid var(--border-bright);
      border-radius: 8px;
      padding: 0.3rem;
    }

    .branded-select option {
      padding: 0.45rem 0.6rem;
      border-radius: 4px;
    }

    .branded-select option:hover {
      background-color: rgba(0, 229, 255, 0.16);
    }
  }

  .options-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding-block-start: 0.25rem;
  }

  .check-row {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.82rem;
    cursor: pointer;
  }

  .volume-field {
    min-inline-size: 160px;
  }

  .dialog-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    border-block-start: 1px solid var(--border-glass);
    padding-block-start: 0.75rem;
  }

  /* High Scores Table */
  .scores-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.6rem;
    margin-block-end: 0.8rem;
  }

  .scores-toolbar select {
    max-inline-size: 220px;
  }

  .table-wrap {
    overflow-x: auto;
  }

  .scores-table {
    inline-size: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 0.78rem;
  }

  .scores-table caption {
    text-align: start;
    color: var(--text-muted);
    font-size: 0.74rem;
    margin-block-end: 0.45rem;
  }

  .scores-table th,
  .scores-table td {
    padding: 0.45rem 0.55rem;
    border-block-end: 1px solid rgba(255, 255, 255, 0.1);
    text-align: start;
  }

  .scores-table th {
    color: var(--accent-gold);
    font-size: 0.72rem;
  }

  /* How to Play & Game Over */
  .help-content {
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    font-size: 0.86rem;
    line-height: 1.5;
  }

  .help-content h3 {
    font-family: var(--font-mono);
    font-size: 0.84rem;
    color: var(--accent-gold);
    margin-block-end: 0.25rem;
  }

  .help-list {
    padding-inline-start: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
  }

  .gameover-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.6rem;
    margin-block-end: 1rem;
  }

  .gameover-stat {
    background-color: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 0.6rem;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    font-family: var(--font-mono);
  }

  .gameover-stat span {
    font-size: 0.68rem;
    color: var(--text-muted);
  }

  .gameover-stat strong {
    font-size: 1.2rem;
    color: var(--accent-cyan);
  }

  .save-score-form {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
  }

  .save-score-form label {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--text-muted);
  }

  .save-score-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .save-score-row input[type="text"] {
    font-family: var(--font-mono);
    font-size: 0.88rem;
    color: var(--text-primary);
    background-color: #131c36;
    border: 1px solid var(--border-glass);
    border-radius: 6px;
    padding: 0.4rem 0.65rem;
    inline-size: 160px;
  }

  @supports not (accent-color: #00e5ff) {
    .check-row input[type="checkbox"] {
      position: absolute !important;
      clip-path: inset(50%) !important;
      overflow: hidden !important;
      width: 1px !important;
      height: 1px !important;
      margin: -1px !important;
      padding: 0 !important;
      border: 0 !important;
      white-space: nowrap !important;
    }

    .check-row {
      position: relative;
      padding-inline-start: 1.7rem;
    }

    .check-row input[type="checkbox"] + span::before {
      content: "";
      position: absolute;
      inset-inline-start: 0;
      inset-block-start: 50%;
      transform: translateY(-50%);
      inline-size: 1.15rem;
      block-size: 1.15rem;
      border: 2px solid var(--border-bright);
      background-color: #131c36;
      border-radius: 4px;
    }

    .check-row input[type="checkbox"]:focus-visible + span::before {
      outline: 3px solid var(--accent-gold);
      outline-offset: 2px;
    }

    .check-row input[type="checkbox"]:checked + span::before {
      background-color: var(--accent-cyan);
      border-color: var(--accent-cyan);
    }

    .check-row input[type="checkbox"]:checked + span::after {
      content: "✓";
      position: absolute;
      inset-inline-start: 0.22rem;
      inset-block-start: 50%;
      transform: translateY(-50%);
      color: #03101c;
      font-weight: 700;
      font-size: 0.85rem;
    }
  }

  /* Responsive Tablet / Mobile Layout (preserves natural DOM order for keyboard Tab flow) */
  @media (max-width: 960px) {
    .arena-stage {
      block-size: auto;
      min-block-size: calc(100dvh - 44px);
      grid-template-columns: 1fr;
      grid-template-rows: auto minmax(380px, 56dvh) auto;
      overflow-y: auto;
    }

    .stat-grid {
      grid-template-columns: repeat(3, 1fr);
    }

    .stat-card.stat-highlight {
      grid-column: span 3;
    }

    .depth-bars {
      max-block-size: 110px;
    }
  }

  @media (pointer: coarse) {
    button,
    .ctrl-btn {
      min-block-size: 44px;
      min-inline-size: 44px;
    }
  }

  @media (prefers-reduced-motion: no-preference) {
    .brand-cluster h1 {
      transition: text-shadow 0.3s ease;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    button,
    .depth-fill {
      transition-duration: 0.01s;
    }
  }
}

@layer utilities {
  .visually-hidden:where(:not(:focus-within, :active)) {
    position: absolute !important;
    clip-path: inset(50%) !important;
    overflow: hidden !important;
    width: 1px !important;
    height: 1px !important;
    margin: -1px !important;
    padding: 0 !important;
    border: 0 !important;
    white-space: nowrap !important;
  }
}