/* Mobile and short landscape viewports are contained to the visible screen.
   The puzzle always remains one row; tiles shrink to share the available width. */
@media (max-width: 900px), (orientation: landscape) and (max-height: 700px) {
  html,
  body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    overscroll-behavior: none;
  }

  .landing-page {
    display: block;
    width: 100%;
    height: 100dvh;
    padding: max(22px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right)) max(24px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));
    overflow-y: auto;
  }

  .landing-shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "brand"
      "gradient"
      "copy";
    gap: 22px;
    max-width: 620px;
    margin: 0 auto;
  }

  .landing-gradient { min-height: clamp(150px, 38vh, 270px); transform: none; }
  .landing-copy h1 { margin-bottom: 16px; font-size: clamp(38px, 12vw, 64px); }
  .landing-copy > p:not(.eyebrow) { font-size: 16px; }
  .landing-actions { margin-top: 24px; }

  main {
    display: grid;
    grid-template-areas:
      "header"
      "mode"
      "controls"
      "instruction"
      "stats"
      "board"
      "actions"
      "status"
      "warning";
    grid-template-rows: auto auto auto auto auto minmax(0, 1fr) auto auto auto;
    gap: 7px;
    width: 100%;
    height: 100dvh;
    min-height: 0;
    padding: max(8px, env(safe-area-inset-top)) max(10px, env(safe-area-inset-right)) max(8px, env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left));
  }

  header {
    grid-area: header;
    margin: 0;
    padding: 0 0 6px;
  }

  header h1 { font-size: 20px; }
  .brand { gap: 7px; }
  .brand > span { display: none; }
  .quiet-button { padding: 5px 8px; font-size: 11px; }
  .danger-button { padding: 5px 8px; font-size: 11px; white-space: nowrap; }

  .mode-selector {
    display: grid;
    grid-area: mode;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 5px;
    margin: 0;
  }

  .mode-button { min-width: 0; padding: 5px 4px; overflow: hidden; font-size: 10px; text-overflow: ellipsis; white-space: nowrap; }

  .experiment-dialog {
    overflow-y: scroll;
    scrollbar-color: #c8a2c8 #111720;
    scrollbar-gutter: stable;
    scrollbar-width: auto;
    -webkit-overflow-scrolling: touch;
  }

  .experiment-dialog::-webkit-scrollbar { width: 12px; }
  .experiment-dialog::-webkit-scrollbar-track {
    border-radius: 8px;
    background: #111720;
  }
  .experiment-dialog::-webkit-scrollbar-thumb {
    border: 3px solid #111720;
    border-radius: 8px;
    background: #c8a2c8;
  }

  .controls {
    display: grid;
    grid-area: controls;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 7px 10px;
    align-items: center;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
  }

  .mode-panel {
    grid-area: controls;
    min-width: 0;
    margin: 0;
    padding: 7px 9px;
    font-size: 11px;
  }

  .mode-panel .muted { font-size: 10px; line-height: 1.25; }
  .mode-panel button { padding: 5px 8px; font-size: 10px; white-space: nowrap; }

  .setting-group {
    min-width: 0;
    padding: 7px 9px;
    border-radius: 10px;
  }

  .controls label {
    display: grid;
    grid-template-columns: auto minmax(44px, 1fr) auto;
    gap: 6px;
    align-items: center;
    min-width: 0;
    margin: 0;
    font-size: 12px;
    white-space: nowrap;
  }

  .setting-group label { width: 100%; }

  .controls label:has(#debugMode) {
    display: flex;
  }

  .controls input[type="range"],
  .distance-input {
    width: 100%;
    min-width: 0;
    max-width: none;
  }

  .control-actions {
    display: flex;
    grid-column: 1 / -1;
    gap: 7px;
    margin: 0;
  }

  .control-actions button {
    flex: 1;
    min-height: 34px;
    padding: 5px 8px;
    font-size: 12px;
    white-space: nowrap;
  }

  .controls > .muted { display: none; }

  .instruction {
    grid-area: instruction;
    min-width: 0;
  }

  .instruction > p:first-child { display: none; }
  #puzzlelabel { margin: 0; font-size: 11px; white-space: nowrap; }

  .stats {
    display: flex;
    grid-area: stats;
    justify-content: space-around;
    gap: 12px;
    margin: 0;
    text-align: center;
  }

  .stats strong { font-size: 17px; line-height: 1; }
  .stats span { font-size: 9px; }

  .board {
    display: flex;
    grid-area: board;
    min-width: 0;
    min-height: 0;
    padding: 7px;
    border-radius: 12px;
  }

  .strip {
    display: flex;
    flex: 1;
    flex-wrap: nowrap;
    gap: clamp(1px, .25vw, 3px);
    min-width: 0;
    min-height: 0;
    padding: 4px;
    overflow: hidden;
    scrollbar-width: none;
  }

  .strip::-webkit-scrollbar { display: none; }

  .tile-slot {
    display: grid;
    flex: 1 1 0;
    grid-template-rows: minmax(0, 1fr) auto;
    gap: 2px;
    min-width: 0;
    min-height: 0;
  }

  .tile {
    width: 100%;
    height: 100%;
    min-width: 0;
    min-height: 22px;
    border-radius: clamp(1px, .5vw, 4px);
  }

  .tile-number { font-size: 8px; }
  .strip.dense .tile-number { visibility: hidden; }
  .strip.dense .tile-slot:nth-child(5n) .tile-number,
  .strip.dense .tile-slot:first-child .tile-number,
  .strip.dense .tile-slot:last-child .tile-number { visibility: visible; }

  .debug-values {
    inset: 50% auto auto 50%;
    gap: 1px;
    padding: 2px;
    font-size: 7px;
  }

  .board-help { display: none; }

  .actions {
    display: flex;
    grid-area: actions;
    gap: 6px;
    margin: 0;
  }

  .actions button {
    flex: 1;
    min-height: 36px;
    padding: 6px 12px;
  }

  #status {
    grid-area: status;
    align-self: center;
    min-width: 0;
    min-height: 16px;
    margin: 0;
    overflow: hidden;
    font-size: 11px;
    line-height: 1.3;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  #sharetext {
    position: fixed;
    right: max(10px, env(safe-area-inset-right));
    bottom: max(8px, env(safe-area-inset-bottom));
    width: min(420px, calc(100vw - 20px));
    max-height: 58px;
    margin: 0;
  }

  #warning {
    grid-area: warning;
    min-height: 0;
    font-size: 11px;
  }

  #warning:empty { display: none; }
}

@media (orientation: portrait) and (max-width: 900px) {
  .mode-selector { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mode-button[data-mode="experiment"] { grid-column: 1 / -1; }
}

/* Landscape becomes a compact toolbar + board + footer. This breakpoint also
   covers short desktop-sized browser windows such as mobile landscape previews. */
@media (orientation: landscape) and (max-height: 700px) {
  .landing-page { padding-block: max(14px, env(safe-area-inset-top)); }
  .landing-shell {
    grid-template-columns: minmax(220px, .8fr) minmax(360px, 1.2fr);
    grid-template-areas:
      "brand brand"
      "gradient copy";
    gap: 14px 28px;
    max-width: 980px;
  }
  .landing-brand { font-size: 22px; }
  .landing-gradient { min-height: min(52vh, 270px); }
  .landing-copy h1 { margin: 3px 0 10px; font-size: clamp(35px, 7vw, 58px); }
  .landing-copy > p:not(.eyebrow) { margin: 7px 0; font-size: 13px; line-height: 1.4; }
  .landing-actions { gap: 7px; margin-top: 11px; }
  .landing-participate { min-height: 44px; padding: 10px 18px; font-size: 16px; }

  main {
    grid-template-areas:
      "header header header"
      "mode mode mode"
      "controls controls controls"
      "board board board"
      "actions status stats"
      "warning warning warning";
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-rows: auto auto auto minmax(0, 1fr) auto auto;
    gap: 4px 9px;
    padding: max(4px, env(safe-area-inset-top)) max(8px, env(safe-area-inset-right)) max(4px, env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-left));
  }

  header {
    align-self: center;
    justify-content: start;
    gap: 15px;
    margin: 0;
    padding: 0 6px 0 0;
    border: 0;
  }

  header h1 { font-size: 19px; }
  .brand > span { display: none; }
  .quiet-button { padding: 4px 7px; font-size: 10px; white-space: nowrap; }
  .danger-button { padding: 4px 7px; font-size: 10px; }

  .instruction { display: none; }

  .mode-selector { align-self: center; grid-template-columns: repeat(3, auto); }
  .mode-button { padding: 4px 7px; }

  .stats {
    min-width: max-content;
    justify-content: end;
    gap: 12px;
    align-self: center;
  }

  .controls {
    grid-template-columns: minmax(130px, .8fr) minmax(180px, 1.2fr) minmax(84px, auto);
    gap: 5px 9px;
  }

  .control-actions {
    grid-column: auto;
  }

  .board { padding: 3px; border-radius: 10px; }
  .strip { padding: 2px; }
  .tile-slot { gap: 1px; }

  .actions {
    min-width: 132px;
  }

  .actions button { min-height: 30px; padding: 4px 10px; }

  .welcome-dialog {
    width: min(600px, calc(100% - 24px));
    max-height: calc(100dvh - 20px);
    padding: 18px 22px;
  }

  .welcome-dialog h2 { font-size: 24px; }
  .welcome-dialog > p { margin: 5px 0; line-height: 1.4; }
  .instruction-list { grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 14px 0; padding-left: 20px; font-size: 13px; }
  .welcome-dialog .dialog-actions { margin-top: 12px; }
}

/* Narrow landscape phones place the toolbar actions on a second line while
   preserving a large single-row board below it. */
@media (orientation: landscape) and (max-height: 700px) and (max-width: 700px) {
  main {
    grid-template-areas:
      "header header"
      "mode mode"
      "controls controls"
      "board board"
      "actions stats"
      "status status"
      "warning warning";
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-rows: auto auto auto minmax(0, 1fr) auto auto auto;
    gap: 3px 6px;
  }

  .controls {
    grid-template-columns: minmax(95px, .75fr) minmax(130px, 1.25fr) auto;
    gap: 4px 6px;
  }

  header { gap: 12px; }

  .mode-selector { grid-template-columns: repeat(3, minmax(0, 1fr)); }

  .control-actions { grid-column: auto; }
  .control-actions button { min-height: 26px; padding: 3px 7px; }
  .stats { gap: 9px; }
  .actions { min-width: 130px; }
  .tile-number { font-size: 7px; }
}

@media (orientation: portrait) and (max-width: 360px) {
  .controls {
    grid-template-columns: minmax(0, 1fr);
    gap: 5px;
    padding: 7px 9px;
  }

  .control-actions {
    grid-column: 1;
  }

  .controls label { font-size: 11px; }
  .control-actions button { min-height: 30px; }
}

/* Landing-page containment is touch-device-only. Short desktop windows keep
   the original spacious landing layout and may scroll normally. */
@media (hover: none) and (pointer: coarse) {
  .landing-page {
    display: grid;
    width: 100%;
    height: 100dvh;
    min-height: 0;
    place-items: stretch center;
    padding: max(clamp(10px, 2dvh, 18px), env(safe-area-inset-top)) max(14px, env(safe-area-inset-right)) max(clamp(10px, 2dvh, 18px), env(safe-area-inset-bottom)) max(14px, env(safe-area-inset-left));
    overflow: hidden;
  }

  .landing-shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto auto 10dvh auto minmax(25dvh, 1fr);
    grid-template-areas:
      "brand"
      "gradient"
      "."
      "copy"
      ".";
    gap: clamp(7px, 1.4dvh, 13px);
    width: 100%;
    height: 100%;
    min-height: 0;
    max-width: 620px;
    margin: 0 auto;
  }

  .landing-brand { font-size: clamp(21px, 6vw, 27px); }
  .landing-gradient {
    width: min(100%, 480px);
    height: auto;
    min-height: 0;
    align-self: start;
    justify-self: center;
    padding: clamp(7px, 1.5dvh, 12px);
    border-radius: 18px;
    aspect-ratio: 2 / 1;
    transform: none;
  }
  .landing-gradient span { border-radius: 7px; }
  .landing-copy { display: flex; min-height: 0; flex-direction: column; }
  .landing-copy h1 { margin: 0 0 clamp(5px, 1dvh, 10px); font-size: clamp(34px, 10.5vw, 52px); line-height: .96; }
  .landing-copy > p:not(.eyebrow) { margin: clamp(4px, .8dvh, 8px) 0; font-size: clamp(13px, 3.8vw, 16px); line-height: 1.35; }
  .landing-copy > p.landing-detail { font-size: clamp(12px, 3.5vw, 15px); }
  .landing-actions { gap: clamp(5px, 1dvh, 9px); margin-top: clamp(8px, 1.5dvh, 14px); padding-top: 0; }
  .landing-participate { min-height: 46px; padding: 11px 16px; font-size: clamp(15px, 4.2vw, 18px); }
  .landing-skip { padding: 2px 6px; font-size: 12px; }
}

@media (hover: none) and (pointer: coarse) and (orientation: landscape) and (max-height: 700px) {
  .landing-page { padding-block: max(10px, env(safe-area-inset-top)) max(10px, env(safe-area-inset-bottom)); }
  .landing-shell {
    grid-template-columns: minmax(180px, .8fr) minmax(300px, 1.2fr);
    grid-template-rows: auto minmax(0, 1fr);
    grid-template-areas:
      "brand brand"
      "gradient copy";
    gap: 9px 22px;
    max-width: 980px;
  }
  .landing-brand { font-size: 20px; }
  .landing-gradient {
    width: min(100%, 68dvh);
    height: auto;
    align-self: center;
    aspect-ratio: 2 / 1;
  }
  .landing-copy h1 { margin: 0 0 6px; font-size: clamp(30px, 6vw, 48px); }
  .landing-copy > p:not(.eyebrow) { margin: 4px 0; font-size: 12px; line-height: 1.3; }
  .landing-copy > p.landing-detail { font-size: 11px; }
  .landing-actions { gap: 4px; margin-top: 4px; padding-top: 0; }
  .landing-participate { min-height: 39px; padding: 8px 14px; font-size: 14px; }
  .landing-skip { font-size: 10px; }
}

@media (hover: none) and (pointer: coarse) and (orientation: portrait) and (max-height: 600px) {
  .landing-page {
    padding-block: max(7px, env(safe-area-inset-top)) max(7px, env(safe-area-inset-bottom));
  }
  .landing-shell {
    grid-template-rows: auto auto 10dvh auto minmax(25dvh, 1fr);
    gap: 5px;
  }
  .landing-brand { font-size: 19px; }
  .landing-gradient { width: min(100%, 42dvh); padding: 5px; border-radius: 12px; }
  .landing-gradient span { border-radius: 4px; }
  .landing-copy h1 { margin-bottom: 3px; font-size: clamp(29px, 9.5vw, 38px); }
  .landing-copy > p:not(.eyebrow) { margin: 3px 0; font-size: 12px; line-height: 1.25; }
  .landing-copy > p.landing-detail { font-size: 11px; }
  .landing-actions { gap: 3px; margin-top: 3px; padding-top: 0; }
  .landing-participate { min-height: 37px; padding: 7px 12px; font-size: 14px; }
  .landing-skip { font-size: 10px; }
}