:root {
  color-scheme: dark;
  --bg: #05090c;
  --bg-soft: #0a1117;
  --panel: rgba(13, 21, 27, 0.86);
  --panel-solid: #0d151b;
  --line: rgba(124, 231, 171, 0.13);
  --line-strong: rgba(124, 231, 171, 0.28);
  --text: #e8f4ed;
  --muted: #8ba497;
  --accent: #4be58e;
  --accent-soft: rgba(75, 229, 142, 0.14);
  --teal: #2ec4b6;
  --danger: #ff6b81;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.5);
  --radius: 20px;
  --font: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono",
    monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

button,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 60% 45% at 12% -5%, rgba(46, 196, 182, 0.16), transparent 60%),
    radial-gradient(ellipse 55% 45% at 96% 8%, rgba(75, 229, 142, 0.1), transparent 62%),
    radial-gradient(ellipse 40% 40% at 50% 108%, rgba(34, 112, 96, 0.16), transparent 65%);
}

.ambient::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(142, 220, 179, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(142, 220, 179, 0.028) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 85%);
}

.page {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 24px;
}

/* ---------- top bar ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  background:
    linear-gradient(145deg, rgba(75, 229, 142, 0.16), rgba(46, 196, 182, 0.04)),
    var(--panel-solid);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.3) inset, 0 10px 30px rgba(0, 0, 0, 0.35);
  font-size: 26px;
}

.brand-text h1 {
  margin: 0;
  font-size: clamp(22px, 2.4vw, 30px);
  letter-spacing: -0.03em;
  font-weight: 750;
}

.brand-text h1 span {
  color: var(--accent);
}

.brand-text p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 12.5px;
  letter-spacing: 0.14em;
}

.scoreboard {
  display: flex;
  gap: 8px;
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(9, 16, 21, 0.66);
  backdrop-filter: blur(10px);
}

.stat {
  min-width: 82px;
  padding: 7px 14px;
  border-radius: 11px;
  text-align: center;
}

.stat + .stat {
  border-left: 1px solid var(--line);
  border-radius: 0 11px 11px 0;
}

.stat span {
  display: block;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.18em;
}

.stat strong {
  display: block;
  margin-top: 3px;
  font-variant-numeric: tabular-nums;
  font-size: 21px;
  font-weight: 700;
  line-height: 1;
}

#score {
  color: var(--accent);
}

/* ---------- layout ---------- */

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 356px;
  gap: 20px;
  align-items: start;
}

.stage {
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 6px);
  background: linear-gradient(180deg, rgba(17, 28, 35, 0.7), rgba(7, 12, 16, 0.75));
  box-shadow: var(--shadow);
}

.canvas-shell {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(75, 229, 142, 0.16);
  border-radius: var(--radius);
  background: #060d11;
  aspect-ratio: 728 / 560;
}

#board {
  display: block;
  width: 100%;
  height: 100%;
}

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

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(3, 8, 11, 0.58);
  backdrop-filter: blur(7px);
  transition: opacity 180ms ease, visibility 180ms ease;
  z-index: 2;
}

.overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.overlay-card {
  width: min(400px, 100%);
  padding: 30px 28px 26px;
  border: 1px solid var(--line-strong);
  border-radius: 22px;
  background:
    radial-gradient(circle at 50% 0%, rgba(75, 229, 142, 0.12), transparent 60%),
    rgba(8, 15, 20, 0.94);
  box-shadow: 0 26px 80px rgba(0, 0, 0, 0.65);
  text-align: center;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.overlay-card h2 {
  margin: 0;
  font-size: 26px;
  letter-spacing: -0.02em;
}

.overlay-card > p:not(.eyebrow, .overlay-hint) {
  margin: 12px auto 22px;
  max-width: 310px;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.7;
}

.primary,
.ghost {
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 11px 18px;
  font-weight: 650;
  font-size: 13.5px;
  transition: transform 120ms ease, background 140ms ease, border-color 140ms ease;
}

.primary {
  background: linear-gradient(180deg, #59ee9a, #35cd78);
  color: #04110a;
  box-shadow: 0 8px 24px rgba(53, 205, 120, 0.24);
}

.primary:hover {
  transform: translateY(-1px);
  background: linear-gradient(180deg, #6cf3a6, #3edb84);
}

.primary:active {
  transform: translateY(0);
}

.ghost {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.025);
  color: var(--text);
}

.ghost:hover:not(:disabled) {
  border-color: var(--line-strong);
  background: var(--accent-soft);
}

.ghost:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

.overlay-hint {
  margin: 16px 0 0;
  color: #6f8b7c;
  font-size: 11.5px;
}

/* ---------- stage foot ---------- */

.stage-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 6px 2px;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 11.5px;
  line-height: 1.8;
}

.key {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--line);
  border-bottom-color: var(--line-strong);
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.035);
  color: #b9cec2;
  font-family: var(--mono);
  font-size: 10.5px;
}

.dot {
  margin: 0 5px;
  color: #52685c;
}

.dpad {
  display: none;
  grid-template-columns: repeat(3, 42px);
  grid-template-rows: repeat(2, 42px);
  gap: 6px;
}

.dpad button {
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--bg-soft);
  color: var(--text);
  font-size: 16px;
  touch-action: manipulation;
}

.dpad button:active {
  background: var(--accent-soft);
  border-color: var(--line-strong);
}

.dpad button[data-action="上"] {
  grid-column: 2;
}

.dpad button[data-action="左"] {
  grid-row: 2;
  grid-column: 1;
}

.dpad button[data-action="下"] {
  grid-row: 2;
  grid-column: 2;
}

.dpad button[data-action="右"] {
  grid-row: 2;
  grid-column: 3;
}

/* ---------- sidebar ---------- */

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(14px);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.22);
}

.controls {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
}

.control-row {
  display: flex;
  flex: 1;
  gap: 8px;
  min-width: 0;
}

#aiBtn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  justify-content: center;
  white-space: nowrap;
}

#aiBtn.active {
  background: linear-gradient(180deg, #2b3b34, #1b2a23);
  border-color: var(--line-strong);
  color: var(--accent);
  box-shadow: 0 0 0 1px rgba(75, 229, 142, 0.1) inset;
}

.ai-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 3px rgba(4, 17, 10, 0.22);
}

#aiBtn.active .ai-dot {
  animation: pulse 1.4s ease-in-out infinite;
}

.control-row .ghost {
  padding: 11px 12px;
}

.speed {
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: 0.12em;
}

.speed select {
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--bg-soft);
  padding: 6px 8px;
  color: var(--text);
  font-size: 11.5px;
  letter-spacing: 0;
  outline: none;
}

.speed select:focus {
  border-color: var(--line-strong);
}

.agent-card {
  padding: 18px;
}

.card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.card-head h2,
.rules h2 {
  margin: 0;
  font-size: 16px;
  letter-spacing: -0.01em;
}

.status-pill {
  flex: none;
  margin-top: 2px;
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.025);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.status-pill.live {
  border-color: rgba(75, 229, 142, 0.35);
  background: var(--accent-soft);
  color: var(--accent);
}

.agent-empty {
  margin: 0;
  padding: 18px 16px;
  border: 1px dashed var(--line);
  border-radius: 14px;
  color: #7e968a;
  font-size: 12.5px;
  line-height: 1.85;
}

.agent-output {
  max-height: 330px;
  margin: 0;
  padding: 15px 16px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(3, 9, 12, 0.72);
  color: #cfe3d7;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.9;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  scrollbar-width: thin;
  scrollbar-color: #244134 transparent;
}

.agent-output::selection {
  background: rgba(75, 229, 142, 0.3);
}

.rules {
  padding: 18px;
}

.rules .eyebrow {
  margin-bottom: 7px;
}

.rules ol {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: priority;
}

.rules li {
  position: relative;
  padding-left: 38px;
  counter-increment: priority;
}

.rules li::before {
  content: "0" counter(priority);
  position: absolute;
  left: 0;
  top: 1px;
  display: grid;
  place-items: center;
  width: 25px;
  height: 25px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 700;
}

.rules strong {
  display: block;
  margin-bottom: 3px;
  font-size: 12.5px;
  font-weight: 650;
}

.rules span {
  display: block;
  color: var(--muted);
  font-size: 11.5px;
  line-height: 1.65;
}

/* ---------- footer ---------- */

.footer {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2px;
  padding: 24px 0 0;
  color: #5f766a;
  font-size: 10.5px;
  letter-spacing: 0.06em;
}

/* ---------- animations ---------- */

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    box-shadow: 0 0 0 3px rgba(4, 17, 10, 0.22);
  }
  50% {
    opacity: 0.55;
    box-shadow: 0 0 0 6px rgba(75, 229, 142, 0.08);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- responsive ---------- */

@media (max-width: 1020px) {
  .layout {
    grid-template-columns: minmax(0, 1fr) 320px;
  }

  .page {
    width: min(1180px, calc(100% - 28px));
  }

  .stat {
    min-width: 70px;
    padding: 7px 10px;
  }
}

@media (max-width: 880px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .controls {
    grid-column: 1 / -1;
  }

  .agent-card {
    grid-column: 1 / -1;
  }

  .agent-output {
    max-height: 260px;
  }
}

@media (max-width: 620px) {
  .page {
    width: calc(100% - 20px);
    padding-top: 16px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .scoreboard {
    width: 100%;
    justify-content: space-between;
  }

  .stat {
    flex: 1;
    min-width: 0;
  }

  .stage {
    padding: 8px;
  }

  .canvas-shell {
    border-radius: 15px;
  }

  .stage-foot {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 4px 2px;
  }

  .dpad {
    display: grid;
    align-self: center;
  }

  .overlay-card {
    padding: 22px 18px;
  }

  .overlay-card h2 {
    font-size: 21px;
  }

  .overlay-card > p:not(.eyebrow, .overlay-hint) {
    font-size: 12px;
    line-height: 1.65;
  }

  .sidebar {
    grid-template-columns: minmax(0, 1fr);
  }

  .controls {
    flex-wrap: wrap;
  }

  .control-row {
    flex-basis: 100%;
  }

  .speed {
    flex: 1;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .speed select {
    min-width: 130px;
  }

  .rules ol {
    gap: 12px;
  }
}