:root {
  --bg: #101418;
  --panel: #1a2026;
  --panel2: #232b33;
  --text: #e8eef4;
  --muted: #9aa7b5;
  --accent: #ffd23f;
  --accent-dark: #c9a11f;
  --ok: #2aa84a;
  --danger: #d33a2a;
  --danger-soft: #ff9b8a;
  --line: #3a4652;
  --line-soft: #2a323b;
  --card-line: #33404d;
  --btn-hover: #2c363f;
  --overlay: rgba(0,0,0,0.68);
  --on-accent: #1a1400;
  --on-ok: #06170a;
  --die-face: #f6f7f9;
  --die-line: #c7ccd3;
  --pip: #1b2330;
  --glow: rgba(255,210,63,0.55);
  --glow-soft: rgba(255,210,63,0.5);
}

/* Tron-style cyber theme: neon cyan accents on a near-black chrome. */
[data-theme="cyber"] {
  --bg: #030509;
  --panel: #070c16;
  --panel2: #0b1220;
  --text: #d7ecf7;
  --muted: #6f8ca6;
  --accent: #22d3ee;
  --accent-dark: #0ea5c4;
  --ok: #22c55e;
  --danger: #f43f5e;
  --danger-soft: #fda4af;
  --line: #1d3352;
  --line-soft: #12233b;
  --card-line: #1d3352;
  --btn-hover: #12233b;
  --overlay: rgba(1,3,8,0.78);
  --on-accent: #02121a;
  --on-ok: #021208;
  --die-face: #0b1220;
  --die-line: #22d3ee;
  --pip: #22d3ee;
  --glow: rgba(34,211,238,0.55);
  --glow-soft: rgba(34,211,238,0.5);
}

[data-theme="cyber"] .btn-primary,
[data-theme="cyber"] .btn-resume,
[data-theme="cyber"] .seg.seg-on {
  box-shadow: 0 0 14px rgba(34, 211, 238, 0.35);
}

[data-theme="cyber"] .game-card {
  box-shadow: inset 0 0 0 1px rgba(34, 211, 238, 0.08);
}

/* LCARS-inspired: amber-on-black computer-console look. Rounded pill
   shapes, warm amber accent, dark panels, minimal borders. */
[data-theme="lcars"] {
  --bg: #000000;
  --panel: #0a0a0f;
  --panel2: #14141f;
  --text: #ffcc66;
  --muted: #8899aa;
  --accent: #ff9b00;
  --accent-dark: #cc7700;
  --ok: #44aa44;
  --danger: #cc4444;
  --danger-soft: #ff8888;
  --line: #ff9b00;
  --line-soft: #332211;
  --card-line: #443322;
  --btn-hover: #1a1a2e;
  --overlay: rgba(0,0,0,0.85);
  --on-accent: #000000;
  --on-ok: #000000;
  --die-face: #14141f;
  --die-line: #ff9b00;
  --pip: #ff9b00;
  --glow: rgba(255,155,0,0.5);
  --glow-soft: rgba(255,155,0,0.4);
}

[data-theme="lcars"] .btn,
[data-theme="lcars"] .game-card,
[data-theme="lcars"] .icon-btn,
[data-theme="lcars"] .result-box {
  border-radius: 999px;
  border-width: 1px;
}
[data-theme="lcars"] .result-box { border-radius: 20px; }
[data-theme="lcars"] .game-card { border-radius: 16px; }
[data-theme="lcars"] .die-face { border-radius: 14%; }
[data-theme="lcars"] .game-title,
[data-theme="lcars"] .app-title { letter-spacing: 0.15em; text-transform: uppercase; }
[data-theme="lcars"] .status-line, [data-theme="lcars"] .turn-badge { font-variant: small-caps; letter-spacing: 0.06em; }
[data-theme="lcars"] .seg.seg-on,
[data-theme="lcars"] .btn-primary,
[data-theme="lcars"] .btn-resume {
  box-shadow: 0 0 12px rgba(255,155,0,0.3);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
}

#app { height: 100vh; height: 100dvh; display: flex; flex-direction: column; }

.screen { height: 100%; display: flex; flex-direction: column; overflow-y: auto; }
.screen.hidden { display: none; }
#screen-home { position: relative; overflow-y: auto; }
#screen-game { overflow: hidden; }
.dev-reload {
  position: absolute;
  top: 0.8rem;
  right: 0.8rem;
  z-index: 5;
}

/* ------------------------------------------------------------- focus ring */

.btn-focus.focused, .btn:focus {
  outline: 4px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 2px rgba(0,0,0,0.55), 0 0 18px var(--glow);
}

/* ---------------------------------------------------------------- buttons */

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--panel2);
  color: var(--text);
  font-size: 1rem;
  padding: 0.65em 1.1em;
  border-radius: 10px;
  cursor: pointer;
  user-select: none;
  font-family: inherit;
}
.btn:hover { background: var(--btn-hover); }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
  font-weight: 700;
}

.btn-resume {
  display: block;
  margin: 1.2rem auto 0;
  background: var(--ok);
  border-color: var(--ok);
  color: var(--on-ok);
  font-weight: 700;
  font-size: 1.1rem;
}

/* ------------------------------------------------------------------- home */

.app-title {
  text-align: center;
  margin-top: 4vh;
  font-size: clamp(1.6rem, 5vw, 2.6rem);
  letter-spacing: 0.02em;
}

.app-sub {
  text-align: center;
  color: var(--muted);
  margin: 0.4rem auto 1.4rem;
  max-width: 36rem;
  padding: 0 1rem;
}

.theme-switch {
  display: flex;
  gap: 0.6rem;
  justify-content: center;
  margin: 0 auto 1.1rem;
}
.theme-switch .btn { min-width: 7.5rem; }

.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 0.9rem;
  padding: 0 1rem;
  max-width: 58rem;
  width: 100%;
  margin: 0 auto;
  flex: 1;
  align-content: start;
}

.game-card {
  appearance: none;
  border: 1px solid var(--card-line);
  background: linear-gradient(160deg, var(--panel2), var(--panel));
  color: var(--text);
  border-radius: 14px;
  padding: 1.2rem 1rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-height: 96px;
  text-align: left;
  font-family: inherit;
}
.game-card:hover { border-color: var(--accent-dark); }
.game-name { font-size: 1.25rem; font-weight: 700; }
.game-meta { color: var(--muted); font-size: 0.85rem; }

.app-foot {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 1.4rem 0 1.8rem;
}

.notice {
  text-align: center;
  color: var(--danger-soft);
  padding: 1rem;
}

/* ------------------------------------------------------------------ setup */

#screen-setup {
  align-items: center;
  padding: 3vh 1rem;
  gap: 1.1rem;
}

.setup-title { font-size: 1.7rem; }

.setup-field {
  width: 100%;
  max-width: 34rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.setup-label { color: var(--muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; }

.setup-field .btn { flex: 1; }

.setup-field { flex-direction: row; flex-wrap: wrap; }
.setup-field > .setup-label { flex-basis: 100%; }

.seg.seg-on {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
  font-weight: 700;
}

.lvl-row { display: flex; align-items: center; gap: 0.8rem; flex: 1; }
.lvl-slider { flex: 1; accent-color: var(--accent); height: 2rem; }
.lvl-val { font-weight: 700; min-width: 2.2rem; text-align: center; font-size: 1.1rem; }

.setup-start { display: flex; gap: 0.9rem; margin-top: 0.8rem; }
.setup-start .btn { padding: 0.85em 2.2em; font-size: 1.05rem; }

/* ---------------------------------------------------------------- scores */

#screen-scores {
  align-items: center;
  padding: 3vh 1rem;
  gap: 1.1rem;
}

.scores-home-btn { margin-top: 0.4rem; }

.scores-summary {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0.2rem 0 0.6rem;
}

.scores-panel {
  width: 100%;
  max-width: 34rem;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.scores-panel h2 {
  font-size: 1.1rem;
  margin: 0 0 0.3rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.scores-panel h3 {
  font-size: 0.95rem;
  margin: 0.6rem 0 0.2rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.scores-line { margin: 0.15rem 0; font-size: 0.95rem; }

.scores-row {
  font-size: 0.95rem;
  padding: 0.22rem 0;
  border-bottom: 1px solid var(--line-soft);
}
.scores-row:last-child { border-bottom: none; }

.scores-row.muted { color: var(--muted); font-size: 0.85rem; }

[data-theme="lcars"] .scores-panel { border-radius: 999px; padding: 0.9rem 1.6rem; }
[data-theme="lcars"] .scores-panel h2 { letter-spacing: 0.2em; }
[data-theme="cyber"] .scores-panel { border-color: var(--line); box-shadow: inset 0 0 0 1px var(--glow-soft); }

/* ------------------------------------------------------------------ game */

#game-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.8rem;
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--line-soft);
  background: var(--panel);
  flex: 0 0 auto;
}
.icon-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--panel2);
  color: var(--text);
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 10px;
  font-size: 1.1rem;
  cursor: pointer;
  flex-shrink: 0;
}
.game-title {
  font-size: 1.2rem;
  font-weight: 700;
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#header-view3d { font-weight: 700; font-size: 0.9rem; }
#header-view3d[aria-pressed="true"] {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
}

#game-main {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  position: relative;
}

#board-wrap {
  flex: 1 1 auto;
  min-height: 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-style: preserve-3d;
  transition: transform 0.35s ease;
}
#game-main.view-3d #board-wrap {
  transform-style: preserve-3d;
  transition: transform 0.3s ease;
}
/* When 3D view is on, the canvas casts a drop-shadow from every drawn
   piece, making discs/stones/pawns appear to float above the table. */
#game-main.view-3d #board {
  filter: drop-shadow(0 5px 3px rgba(0,0,0,0.55));
}
#board {
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: 100%;
  display: block;
  touch-action: manipulation;
  cursor: pointer;
}

/* In-game help: beside the board when there is room, below it on narrow screens. */
#help-panel {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 1rem 1.2rem;
  background: var(--panel2);
  border-top: 1px solid var(--line-soft);
  text-align: left;
}
#help-panel.hidden { display: none; }
#help-panel .result-title { font-size: 1.15rem; text-align: left; margin-bottom: 0.5rem; }
#help-panel .btn { min-width: 9rem; margin-top: 0.8rem; }

/* Move history panel: side bar on wide screens, a compact strip below
   the board on narrow / portrait screens. */
.move-list {
  flex: 0 0 auto;
  height: 8rem;
  max-height: 8rem;
  overflow-y: auto;
  padding: 0.5rem 0.9rem;
  background: var(--panel2);
  border-top: 1px solid var(--line-soft);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--muted);
}
.move-list.hidden { display: none; }
.move-list .ml-title {
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--muted); margin-bottom: 0.3rem;
}
.move-list .ml-row { display: flex; gap: 0.4rem; }
.move-list .ml-num { color: var(--muted); min-width: 1.6rem; text-align: right; }
.move-list .ml-move { color: var(--text); }

#status-bar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.5rem 0.9rem;
  border-top: 1px solid var(--line-soft);
  background: var(--panel);
  font-size: 0.95rem;
}
#status-bar > .turn-badge,
#status-bar > .status-line { min-width: 0; }
.turn-badge { font-weight: 700; white-space: nowrap; }
.turn-ai { color: var(--accent); }
.turn-over { color: var(--danger-soft); }
.status-line {
  color: var(--muted);
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Unified primary action (roll / pass / draw) lives in the status bar.
   The slot keeps a constant height whether or not a button is present so the
   board never resizes when the action appears or disappears. */
.primary-action {
  flex: 0 0 auto;
  margin-left: auto;
  min-height: 2.6rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.primary-action .btn {
  font-size: 0.95rem;
  padding: 0.5em 1.3em;
  min-height: 2.6rem;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.primary-action .btn:disabled { opacity: 0.4; }

/* CSS-3D dice: the roll control in the status bar is a cube die. While a
   roll is pending it glows; on roll it tumbles (random faces) then the
   front face settles on the rolled number. */
.die-btn {
  appearance: none;
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
  line-height: 0;
}
.die-btn.available {
  padding: 0.2rem 0.45rem;
  border-radius: 12px;
  animation: die-glow 1.6s ease-in-out infinite;
}
@keyframes die-glow {
  0%, 100% { box-shadow: 0 0 0 0 var(--glow); }
  50% { box-shadow: 0 0 12px 2px var(--glow-soft); }
}
.die-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  line-height: 0;
  perspective: 8rem;
}
.die-display { display: flex; align-items: center; }

.die3d {
  --size: 2rem;
  width: var(--size);
  height: var(--size);
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.35s cubic-bezier(0.2, 0.7, 0.3, 1.15);
}
.die3d-sm { --size: 1.55rem; }
.die-face {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  padding: 2px;
  background: var(--die-face);
  border: 1px solid var(--die-line);
  border-radius: 18%;
  backface-visibility: hidden;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.05);
}
.die-face-1 { transform: rotateY(0deg) translateZ(calc(var(--size) / 2)); }
.die-face-2 { transform: rotateY(-90deg) translateZ(calc(var(--size) / 2)); }
.die-face-3 { transform: rotateY(180deg) translateZ(calc(var(--size) / 2)); }
.die-face-4 { transform: rotateY(90deg) translateZ(calc(var(--size) / 2)); }
.die-face-5 { transform: rotateX(90deg) translateZ(calc(var(--size) / 2)); }
.die-face-6 { transform: rotateX(-90deg) translateZ(calc(var(--size) / 2)); }
.pip { border-radius: 50%; }
.pip.on { background: var(--pip); }
.die3d-1 { transform: rotateY(0deg); }
.die3d-2 { transform: rotateY(90deg); }
.die3d-3 { transform: rotateY(180deg); }
.die3d-4 { transform: rotateY(-90deg); }
.die3d-5 { transform: rotateX(-90deg); }
.die3d-6 { transform: rotateX(90deg); }
.die3d.rolling { animation: dice-wobble 0.5s ease-in-out infinite; }
@keyframes dice-wobble {
  0%   { transform: rotateX(0deg)   rotateY(0deg); }
  25%  { transform: rotateX(30deg)  rotateY(180deg); }
  50%  { transform: rotateX(-20deg) rotateY(360deg); }
  75%  { transform: rotateX(20deg)  rotateY(540deg); }
  100% { transform: rotateX(0deg)   rotateY(720deg); }
}

.game-actions {
  flex: 0 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 0.7rem 0.9rem;
  border-top: 1px solid var(--line-soft);
  background: var(--panel);
  justify-content: center;
}

.invite-panel {
  position: absolute;
  right: 0.8rem;
  bottom: 0.8rem;
  background: #fff;
  color: #111;
  border-radius: 12px;
  padding: 0.9rem;
  z-index: 5;
  box-shadow: 0 6px 24px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  max-width: 220px;
}
.invite-panel.hidden { display: none; }
.invite-code { font-weight: 700; letter-spacing: 0.12em; }
.invite-url {
  font-size: 0.7rem;
  word-break: break-all;
  text-align: center;
  color: #444;
}
#invite-qr { background: #fff; }

/* ----------------------------------------------------------------- overlay */

.overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
}
.overlay.hidden { display: none; }

.result-box {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 2rem 2.4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
  max-width: 90vw;
  text-align: center;
}
.result-title { font-size: 1.6rem; }
.result-box p { color: var(--muted); }
.result-box .btn { min-width: 11rem; }

#confirm-overlay .result-box { max-width: 22rem; }

/* How-to-play rules overlay (shared by setup + in-game help). */
#rules-overlay .result-box { max-width: 40rem; max-height: 86vh; overflow-y: auto; text-align: left; }
#rules-overlay .result-title { text-align: center; margin-bottom: 0.4rem; }
#rules-overlay .btn { min-width: 9rem; margin: 0.6rem auto 0; }
.rules-list { list-style: none; display: flex; flex-direction: column; gap: 0.7rem; }
.rules-list li { color: var(--text); line-height: 1.45; padding-left: 1.2rem; position: relative; }
.rules-list li::before {
  content: "";
  position: absolute;
  left: 0.15rem;
  top: 0.55em;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--accent);
}

/* Setup-screen inline rules toggle. */
.howto-btn { align-self: flex-start; }
.rules-block {
  width: 100%;
  max-width: 34rem;
  background: var(--panel2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem 1.2rem;
  font-size: 0.95rem;
}
.rules-block.hidden { display: none; }
.rules-block .rules-list li { color: var(--muted); }

/* --------------------------------------------------------------- touch */

@media (min-width: 701px) {
  #game-main {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(15rem, 20rem);
    grid-template-rows: minmax(0, 1fr) auto auto;
  }
  #board-wrap { grid-column: 1; grid-row: 1; }
  #status-bar { grid-column: 1; grid-row: 2; }
  #help-panel {
    grid-column: 2;
    grid-row: 1 / span 3;
    border-top: none;
    border-left: 1px solid var(--line-soft);
    flex: none;
  }
  #move-list {
    grid-column: 1;
    grid-row: 3;
    border-top: 1px solid var(--line-soft);
    max-height: 8rem;
    flex: none;
  }
}

@media (max-width: 700px) {
  #status-bar { flex-direction: column; align-items: stretch; text-align: center; gap: 0.2rem; }
  .status-line { text-align: center; }
  .primary-action { margin-left: 0; }
  .primary-action .btn { width: 100%; }
}