:root {
  color-scheme: dark;
  --bg: #161512;
  --bg-alt: #1d1b17;
  --panel: #262421;
  --panel-soft: #2c2925;
  --line: #3b3833;
  --text: #f0ece6;
  --muted: #b0aaa1;
  --accent: #d6a84f;
  --accent-soft: #6e5430;
  --danger: #c96a5d;
  --success: #69bf7a;
  --light-sq: #d9c9b2;
  --dark-sq: #8a725a;
  --light-homeland: #9fbbe6;
  --dark-homeland: #d0a2a2;
  --target: #4fb36a88;
  --capture: #cd5c5c99;
  --selected: #f0d36c;
  --shadow: 0 14px 30px rgba(0, 0, 0, 0.25);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top, rgba(214, 168, 79, 0.07), transparent 30%),
    radial-gradient(circle at bottom right, rgba(111, 181, 231, 0.05), transparent 24%),
    linear-gradient(180deg, #13120f 0%, #0f0e0c 100%);
  color: var(--text);
  font: 15px/1.45 "Noto Sans", "Segoe UI", sans-serif;
  overflow-x: hidden;
}

button,
input,
select {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  cursor: pointer;
}

.hidden {
  display: none !important;
}

.shell,
.trainer-page {
  max-width: 1340px;
  margin: 0 auto;
  padding: 18px;
  overflow-x: clip;
}

.classical-lab-grid {
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
}

.topbar,
.trainer-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  margin-bottom: 14px;
}

.brand {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text) !important;
}

.topnav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.topnav a {
  color: var(--muted);
  padding: 7px 10px;
  border-radius: 999px;
}

.topnav a.active,
.topnav a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.topbar-status {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.status-chip {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted);
  border-radius: 999px;
  padding: 7px 12px;
  white-space: nowrap;
}

.panel {
  background: linear-gradient(180deg, rgba(45, 42, 37, 0.98), rgba(28, 26, 22, 0.98));
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.code-editor {
  display: none;
}

.mini-code-editor {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  border-radius: 14px;
  border: 1px solid rgba(214, 173, 64, 0.2);
  background: rgba(16, 15, 13, 0.92);
  overflow: hidden;
  min-height: 24rem;
}

.mini-code-editor-gutter,
.mini-code-editor-highlight,
.mini-code-editor-input {
  margin: 0;
  font: 0.92rem/1.45 "Fira Code", "JetBrains Mono", monospace;
  white-space: pre;
  tab-size: 2;
}

.mini-code-editor-gutter {
  padding: 0.9rem 0.7rem 0.9rem 0.9rem;
  color: rgba(241, 233, 218, 0.38);
  background: rgba(255, 255, 255, 0.04);
  border-right: 1px solid rgba(214, 173, 64, 0.12);
  user-select: none;
  overflow: hidden;
  background-image:
    linear-gradient(
      to bottom,
      transparent calc((var(--error-line, 0) - 1) * 1.45em + 0.9rem),
      rgba(201, 106, 93, 0.2) calc((var(--error-line, 0) - 1) * 1.45em + 0.9rem),
      rgba(201, 106, 93, 0.2) calc(var(--error-line, 0) * 1.45em + 0.9rem),
      transparent calc(var(--error-line, 0) * 1.45em + 0.9rem)
    );
}

.mini-code-editor-surface {
  position: relative;
  min-width: 0;
  min-height: 24rem;
}

.mini-code-editor-highlight,
.mini-code-editor-input {
  box-sizing: border-box;
  width: 100%;
  min-height: 24rem;
  padding: 0.9rem 1rem;
}

.mini-code-editor-highlight {
  color: #f1e9da;
  pointer-events: none;
  overflow: hidden;
  background-image:
    linear-gradient(
      to bottom,
      transparent calc((var(--error-line, 0) - 1) * 1.45em + 0.9rem),
      rgba(201, 106, 93, 0.08) calc((var(--error-line, 0) - 1) * 1.45em + 0.9rem),
      rgba(201, 106, 93, 0.08) calc(var(--error-line, 0) * 1.45em + 0.9rem),
      transparent calc(var(--error-line, 0) * 1.45em + 0.9rem)
    );
}

.mini-code-editor-input {
  position: absolute;
  inset: 0;
  border: 0;
  resize: vertical;
  background: transparent;
  color: transparent;
  caret-color: #f1e9da;
  overflow: auto;
}

.mini-code-editor-input:focus {
  outline: none;
}

.tok-keyword {
  color: #efb04d;
}

.tok-string {
  color: #97d08d;
}

.tok-number {
  color: #8cc7ff;
}

.tok-bracket-match {
  background: rgba(106, 166, 255, 0.22);
  color: #d9ecff;
  border-radius: 3px;
}

.tok-comment {
  color: rgba(241, 233, 218, 0.45);
}

.ruleset-error-details {
  margin-top: 0.85rem;
  padding: 0.85rem 0.95rem;
  border-radius: 10px;
  border: 1px solid rgba(201, 106, 93, 0.42);
  background: rgba(201, 106, 93, 0.08);
  color: #f3d7d2;
  white-space: pre-wrap;
  font: 0.92rem/1.45 "Fira Code", "JetBrains Mono", monospace;
}

.tok-builtin {
  color: #d7baf8;
}

.profile-weights {
  display: grid;
  gap: 1rem;
}

.section-help {
  margin-top: -4px;
  margin-bottom: 12px;
  max-width: 78ch;
  line-height: 1.45;
}

.help-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.1rem;
  height: 1.1rem;
  margin-left: 0.25rem;
  border-radius: 999px;
  border: 1px solid rgba(214, 173, 64, 0.28);
  color: rgba(214, 173, 64, 0.95);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1;
  background: rgba(214, 173, 64, 0.08);
  cursor: help;
  vertical-align: middle;
}

.weight-group {
  border: 1px solid rgba(214, 173, 64, 0.14);
  border-radius: 16px;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.02);
}

.weight-group h3 {
  margin: 0 0 0.8rem;
  font-size: 1rem;
}

.analysis-chosen {
  border: 1px solid rgba(214, 173, 64, 0.16);
  border-radius: 16px;
  padding: 0.9rem 1rem;
  background: rgba(255, 255, 255, 0.02);
  margin-bottom: 1rem;
}

.analysis-moves {
  display: grid;
  gap: 0.9rem;
}

.analysis-move-card {
  border: 1px solid rgba(214, 173, 64, 0.14);
  border-radius: 16px;
  padding: 0.9rem 1rem;
  background: rgba(255, 255, 255, 0.025);
}

.analysis-rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 24px;
  padding: 0 8px;
  margin-right: 8px;
  border-radius: 999px;
  background: rgba(17, 24, 39, 0.88);
  color: #ecfdf5;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.analysis-move-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  margin-bottom: 0.5rem;
}

.analysis-reasons {
  margin: 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.2rem;
  color: rgba(241, 233, 218, 0.84);
  font-size: 0.92rem;
}

.expected-reply-picker {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.85rem;
}

.expected-reply-row {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  padding: 0.7rem 0.8rem;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(214, 173, 64, 0.12);
}

.regression-pass {
  border-color: rgba(86, 170, 105, 0.4);
}

.regression-fail {
  border-color: rgba(209, 88, 88, 0.38);
}

.classical-docs-layout {
  display: grid;
  grid-template-columns: minmax(220px, 0.34fr) minmax(0, 1fr);
  gap: 18px;
}

.docs-nav {
  align-self: start;
  position: sticky;
  top: 16px;
}

.docs-links {
  display: grid;
  gap: 0.5rem;
}

.docs-links a {
  padding: 0.55rem 0.7rem;
  border-radius: 10px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(214, 173, 64, 0.1);
}

.docs-links a:hover {
  color: var(--text);
  border-color: rgba(214, 173, 64, 0.28);
}

.docs-content {
  display: grid;
  gap: 1.4rem;
}

.docs-section + .docs-section {
  padding-top: 0.6rem;
  border-top: 1px solid rgba(214, 173, 64, 0.08);
}

.docs-code {
  margin-top: 0.9rem;
  background: rgba(16, 15, 13, 0.92);
  border: 1px solid rgba(214, 173, 64, 0.16);
  border-radius: 14px;
  padding: 0.9rem 1rem;
  overflow: auto;
  color: #f1e9da;
  font: 0.92rem/1.5 "Fira Code", "JetBrains Mono", monospace;
}

.docs-list {
  margin: 0.7rem 0 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.35rem;
}

.home-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(320px, 1fr);
  gap: 18px;
}

.hero-panel {
  min-height: 260px;
  display: grid;
  gap: 20px;
  align-content: space-between;
}

.hero-copy h1,
.rankings-panel h1 {
  margin: 8px 0 12px;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.02;
  font-weight: 700;
}

.hero-copy p {
  max-width: 62ch;
  color: var(--muted);
  font-size: 17px;
}

.eyebrow,
.section-kicker,
.card-label {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-actions,
.button-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.volume-control {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 10px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(18, 17, 15, 0.96);
  color: var(--muted);
}

.dialogue-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.dialogue-volume-control {
  min-height: 38px;
}

.rules-dialogue-controls {
  margin-bottom: 10px;
}

.volume-control input[type="range"] {
  width: 108px;
  padding: 0;
  border: 0;
  background: transparent;
  accent-color: var(--accent);
}

.primary-link,
.secondary-link,
button,
.toolbar-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 10px;
  padding: 10px 14px;
  border: 1px solid transparent;
}

button,
.primary-link {
  background: #4b6b97;
  border-color: #5d80b0;
  color: white;
}

button.secondary,
.secondary-link,
.secondary-btn {
  background: #302d29;
  border-color: #49453f;
  color: var(--text);
}

button:hover,
.primary-link:hover,
.secondary-link:hover,
.toolbar-link:hover {
  filter: brightness(1.07);
}

.card-stack {
  display: grid;
  gap: 14px;
}

.feature-card {
  display: block;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 16px;
}

.feature-card h2 {
  margin: 6px 0;
  font-size: 22px;
}

.feature-card p,
.muted,
.notice,
.account-note,
.room-info,
.legend {
  color: var(--muted);
}

.account-panel,
.right-rail {
  display: grid;
  gap: 18px;
  align-content: start;
}

.account-summary {
  display: grid;
  gap: 4px;
  margin-bottom: 14px;
}

.account-name {
  font-size: 18px;
  font-weight: 700;
}

.account-meta,
.account-note,
.rank-meta {
  color: var(--muted);
  font-size: 13px;
}

.auth-stack,
.field-stack,
.actions,
.action-list {
  display: grid;
  gap: 10px;
}

.action-list {
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.icon-action {
  justify-content: flex-start;
  gap: 10px;
  text-align: left;
}

.icon-action i {
  font-size: 18px;
}

.overlay-action {
  min-height: 38px;
  padding: 8px 10px;
  font-size: 14px;
}

.room-list {
  display: grid;
  gap: 10px;
}

.room-list-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  padding: 10px 12px;
}

.room-list-item-current {
  border-color: rgba(95, 176, 116, 0.55);
  background: rgba(95, 176, 116, 0.12);
}

.room-list-item-current strong {
  color: #9ce0ac;
}

.current-rooms {
  display: grid;
  gap: 10px;
}

.turn-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(95, 176, 116, 0.18);
  color: #9ce0ac;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.archive-idle-panel {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

input,
select,
textarea {
  width: 100%;
  background: #12110f;
  color: var(--text);
  border: 1px solid #45413a;
  border-radius: 10px;
  padding: 10px 12px;
}

.play-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) 340px;
  gap: 18px;
  align-items: start;
}

.play-shell {
  display: grid;
  gap: 16px;
}

.play-tabs-panel {
  padding: 10px 12px;
}

.play-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.play-tab {
  background: rgba(255, 255, 255, 0.02);
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--text);
  gap: 8px;
}

.play-tab-icon {
  font-size: 15px;
}

.play-tab.active {
  background: rgba(95, 176, 116, 0.14);
  border-color: rgba(95, 176, 116, 0.42);
}

.play-game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 16px;
  align-items: start;
}

.game-sidebar {
  display: grid;
  gap: 14px;
}

.new-game-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.clock-strip {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.clock-chip {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(18, 17, 15, 0.96);
  color: var(--muted);
  font-weight: 700;
}

.clock-chip.clock-active {
  color: #fff7e9;
  border-color: rgba(243, 184, 61, 0.45);
  background: rgba(243, 184, 61, 0.12);
}

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

.archive-delta {
  font-weight: 700;
  min-width: 44px;
  text-align: right;
}

.archive-delta-win {
  color: #8fd39d;
}

.archive-delta-loss {
  color: #f08f8f;
}

.check-row {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
}

.check-row input {
  width: auto;
}

.board-panel {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.board-header,
.split-header,
.modal-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
}

.board-status {
  font-size: 18px;
  line-height: 1.1;
  font-weight: 600;
}

#roomMeta {
  margin-bottom: 2px;
}

.board {
  display: grid;
  grid-template-columns: repeat(8, minmax(52px, 1fr));
  gap: 2px;
  background: rgba(0, 0, 0, 0.22);
  border-radius: 12px;
  padding: 2px;
  width: min(100%, 820px);
  margin: 0 auto;
}

.board-wrap {
  display: grid;
  justify-items: center;
  padding: 6px 2px 4px;
  overflow: visible;
  position: relative;
  min-width: 0;
}

.tutorial-panel {
  margin: 6px 10px 8px;
  padding: 16px 18px 14px;
  border-radius: 16px;
  background:
    radial-gradient(circle at top left, rgba(243, 184, 61, 0.18), transparent 38%),
    linear-gradient(180deg, rgba(34, 29, 23, 0.96), rgba(24, 21, 17, 0.96));
  border: 1px solid rgba(243, 184, 61, 0.3);
}

.tutorial-kicker {
  color: #f3b83d;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 0;
}

.tutorial-panel h3 {
  margin: 10px 0 8px;
  font-size: 31px;
  line-height: 1.05;
  color: #fff7e9;
  max-width: 22ch;
}

.tutorial-panel p {
  margin: 0;
  color: rgba(248, 243, 232, 0.9);
  line-height: 1.55;
  max-width: 34ch;
}

.tutorial-footer {
  margin-top: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.tutorial-float {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 12;
  width: min(420px, calc(100vw - 32px));
  margin: 0;
  box-shadow: 0 20px 36px rgba(0, 0, 0, 0.42);
  backdrop-filter: blur(10px) saturate(1.05);
  -webkit-backdrop-filter: blur(10px) saturate(1.05);
  transition: left 220ms ease, top 220ms ease, opacity 180ms ease;
}

.tutorial-drag-handle {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  cursor: move;
  user-select: none;
}

.tutorial-panel-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
  flex: 0 0 auto;
}

.tutorial-nav-btn {
  min-height: 28px;
  padding: 5px 9px;
  font-size: 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.08);
  color: rgba(255, 248, 235, 0.88);
}

.tutorial-nav-btn:hover:not(:disabled) {
  background: rgba(243, 184, 61, 0.16);
  border-color: rgba(243, 184, 61, 0.28);
  color: #fff7e9;
}

.tutorial-nav-btn:disabled {
  opacity: 0.45;
  cursor: default;
}

.tutorial-ready-btn {
  border-radius: 999px;
  padding: 9px 14px;
  background: #f3b83d;
  color: #16120f;
  border: 1px solid rgba(243, 184, 61, 0.58);
  font-weight: 700;
}

.tutorial-ready-btn:hover {
  background: #f6c45a;
}

.tutorial-dialogue-btn {
  min-width: 120px;
}

.piece-action-menu {
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 4px;
  z-index: 2;
}

.piece-action-icon {
  min-height: 0;
  width: 20px;
  height: 20px;
  padding: 0;
  border-radius: 999px;
  background: rgba(17, 24, 39, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #f7f7f5;
  position: relative;
  overflow: visible;
}

.piece-action-icon i {
  font-size: 12px;
}

.dark-piece .piece-action-icon {
  background: rgba(248, 250, 252, 0.96);
  color: #111827;
  border-color: rgba(17, 24, 39, 0.18);
}

.piece-action-tray {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 8px;
}

.piece-action-tray-btn,
.piece-action-tray-close {
  min-height: 42px;
  border-radius: 999px;
  padding: 8px 14px;
}

.piece-action-tray-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(17, 24, 39, 0.96);
  border: 1px solid rgba(243, 184, 61, 0.3);
  color: #fff7e9;
}

.piece-action-tray-btn i {
  font-size: 18px;
}

.piece-action-tray-close {
  min-width: 42px;
  padding-left: 12px;
  padding-right: 12px;
}

.tutorial-action-target {
  box-shadow: 0 0 0 2px rgba(243, 184, 61, 0.9);
}

.tutorial-action-arrow {
  position: absolute;
  top: -21px;
  left: 50%;
  transform: translateX(-50%);
  color: #f3b83d;
  font-size: 18px;
  line-height: 1;
  text-shadow: 0 6px 12px rgba(0, 0, 0, 0.35);
  animation: tutorial-bob 1.1s ease-in-out infinite;
  pointer-events: none;
}

.square {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 0;
  border-radius: 7px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.square.candidate-from::before,
.square.candidate-to::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 8px;
  pointer-events: none;
}

.square.candidate-from::before {
  background: rgba(88, 176, 255, calc(0.08 + (var(--candidate-from-strength, 0) * 0.12)));
  box-shadow: inset 0 0 0 2px rgba(88, 176, 255, calc(0.18 + (var(--candidate-from-strength, 0) * 0.28)));
}

.square.candidate-to::after {
  background: rgba(76, 214, 120, calc(0.1 + (var(--candidate-to-strength, 0) * 0.16)));
  box-shadow: inset 0 0 0 3px rgba(76, 214, 120, calc(0.2 + (var(--candidate-to-strength, 0) * 0.38)));
}

.square.light { background: var(--light-sq); }
.square.dark { background: var(--dark-sq); }
.square.homeland-light { box-shadow: inset 0 0 0 3px var(--light-homeland); }
.square.homeland-dark { box-shadow: inset 0 0 0 3px var(--dark-homeland); }
.square.setup { outline: 3px dashed #73b5ff; outline-offset: -4px; }
.square.target { box-shadow: inset 0 0 0 5px var(--target); }
.square.capture { box-shadow: inset 0 0 0 5px var(--capture); }
.square.selected { box-shadow: inset 0 0 0 5px var(--selected); }
.square.tutorial-focus { box-shadow: inset 0 0 0 4px rgba(243, 184, 61, 0.92); }
.square.tutorial-goal { box-shadow: inset 0 0 0 4px rgba(98, 196, 255, 0.75); }

.tutorial-arrow {
  position: absolute;
  top: -17px;
  left: 50%;
  transform: translateX(-50%);
  color: #f3b83d;
  font-size: 34px;
  line-height: 1;
  text-shadow: 0 8px 16px rgba(0, 0, 0, 0.35);
  animation: tutorial-bob 1.1s ease-in-out infinite;
  pointer-events: none;
  z-index: 3;
}

@keyframes tutorial-bob {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

.piece {
  width: 76%;
  height: 76%;
  display: grid;
  place-items: center;
  position: relative;
  box-shadow: none;
  overflow: visible;
}

.light-piece {
  background: transparent;
  color: #13110e;
}

.dark-piece {
  background: transparent;
  color: #f9fafb;
}

.piece-art {
  width: 200%;
  margin-top: -33%;
  height: 200%;
  object-fit: contain;
  display: block;
  pointer-events: none;
  user-select: none;
}

.light-piece .piece-art {
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.14));
}

.dark-piece .piece-art {
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.24)) saturate(0.95) brightness(0.98);
}

.busy-icon {
  position: absolute;
  left: 50%;
  bottom: -33%;
  width: 100%;
  height: 100%;
  transform: translateX(-50%);
  pointer-events: none;
  user-select: none;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.24));
}

.spawn-dots {
  position: absolute;
  top: 6px;
  right: 6px;
  display: flex;
  gap: 4px;
}

.spawn-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  border: 1px solid rgba(0, 0, 0, 0.24);
}

.spawn-dot.available { background: #8b8f97; }
.spawn-dot.spawning { background: #7dd3fc; }
.spawn-dot.spent { background: #3ac767; }
.spawn-dot.locked { background: #d55353; }

.coords {
  position: absolute;
  top: 4px;
  left: 6px;
  font-size: 11px;
  color: rgba(0, 0, 0, 0.5);
}

.candidate-badge {
  position: absolute;
  right: 5px;
  top: 5px;
  z-index: 2;
  min-width: 20px;
  height: 20px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 6px;
  background: rgba(17, 24, 39, 0.84);
  color: #ecfdf5;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.spawn-summary {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
  color: var(--muted);
  font-size: 14px;
}

.spawn-summary strong {
  color: var(--text);
}

.board-sidecars {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  gap: 14px;
}

.mini-panel {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  padding: 14px;
}

.mini-panel h3,
.panel h2 {
  margin: 0 0 10px;
  font-size: 18px;
}

.room-controls {
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.log {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
  max-height: 260px;
  overflow: auto;
}

.log li {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  padding: 8px 10px;
}

.log-wrap {
  display: grid;
  gap: 14px;
}

.archive-log {
  display: grid;
  gap: 8px;
}

.archive-log-title {
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.archive-log-item {
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  padding: 8px 10px;
  display: grid;
  gap: 4px;
}

.notice {
  margin-top: 10px;
}

.inline-error {
  background: rgba(201, 106, 93, 0.15);
  border: 1px solid rgba(201, 106, 93, 0.45);
  color: #ffd6d0;
  border-radius: 10px;
  padding: 10px 12px;
}

.rankings-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) 320px;
  gap: 18px;
}

.rankings-table table {
  width: 100%;
  border-collapse: collapse;
}

.rankings-table th,
.rankings-table td {
  padding: 12px 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  text-align: left;
}

.rankings-table th {
  color: var(--muted);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.rank-name {
  font-weight: 700;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(7, 6, 5, 0.72);
  backdrop-filter: blur(8px) saturate(0.7);
  -webkit-backdrop-filter: blur(8px) saturate(0.7);
  display: grid;
  place-items: center;
  padding: 20px;
  z-index: 40;
}

.modal {
  width: min(720px, 100%);
  max-height: 85vh;
  overflow: auto;
}

.rules-copy {
  color: var(--muted);
  display: grid;
  gap: 10px;
}

.rules-copy section {
  display: grid;
  gap: 4px;
}

.rules-copy h3 {
  margin: 0;
  color: var(--text);
  font-size: 15px;
}

.rules-copy p {
  margin: 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 12px;
}

.form-grid .full {
  grid-column: 1 / -1;
}

.field {
  display: grid;
  gap: 6px;
}

.field label {
  color: var(--muted);
  font-size: 13px;
}

.diag-grid {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 8px 10px;
}

.diag-label {
  color: var(--muted);
  font-weight: 600;
}

.diag-value,
.diag-raw {
  word-break: break-word;
}

.diag-raw {
  margin-top: 12px;
  background: #171613;
  border: 1px solid #3c3832;
  border-radius: 10px;
  padding: 10px;
  max-height: 220px;
  overflow: auto;
  white-space: pre-wrap;
  font-size: 12px;
}

@media (max-width: 1040px) {
  .home-grid,
  .play-layout,
  .play-game-layout,
  .new-game-grid,
  .rankings-layout,
  .trainer-grid,
  .classical-lab-grid,
  .classical-docs-layout {
    grid-template-columns: 1fr;
  }

  .board-sidecars {
    grid-template-columns: 1fr;
  }

  .topbar,
  .trainer-header {
    grid-template-columns: 1fr;
  }

  .topbar-status {
    justify-content: flex-start;
  }

  .docs-nav {
    position: static;
  }
}

@media (max-width: 720px) {
  .shell,
  .trainer-page {
    padding: 8px;
  }

  .code-editor {
    min-height: 18rem;
  }

  .mini-code-editor,
  .mini-code-editor-surface,
  .mini-code-editor-highlight,
  .mini-code-editor-input {
    min-height: 18rem;
  }

  .board-status {
    font-size: 17px;
  }

  .board {
    grid-template-columns: repeat(8, minmax(36px, 1fr));
  }

  .board-panel {
    padding-left: 8px;
    padding-right: 8px;
  }

  .play-tabs-panel,
  .new-game-panel,
  #newGamePanel,
  #archivePanel {
    padding-left: 10px;
    padding-right: 10px;
  }

  .play-game-layout {
    gap: 10px;
  }

  .board-wrap {
    width: calc(100% + 12px);
    margin-left: -6px;
    margin-right: -6px;
    padding-left: 0;
    padding-right: 0;
  }

  .play-tabs {
    gap: 6px;
  }

  .play-tab {
    min-height: 40px;
    padding: 8px 11px;
  }

  .play-tab-label {
    display: none;
  }

  .play-tab-icon {
    font-size: 17px;
  }

  .turn-badge {
    min-width: 10px;
    min-height: 10px;
    padding: 0;
    font-size: 0;
    border-radius: 999px;
  }

  .board-header,
  .split-header,
  .modal-header {
    flex-direction: column;
  }

  .board-header {
    gap: 8px;
  }

  .board-header .button-row,
  .room-controls {
    width: 100%;
    justify-content: flex-start;
  }

  .volume-control {
    min-height: 36px;
    padding: 0 8px;
  }

  .volume-control input[type="range"] {
    width: 88px;
  }

  .tutorial-panel {
    padding: 14px 14px 12px;
  }

  .tutorial-panel h3 {
    font-size: 23px;
    max-width: 12ch;
  }

  .tutorial-panel p {
    max-width: 26ch;
    font-size: 14px;
    line-height: 1.45;
  }

  .tutorial-float {
    width: min(360px, calc(100vw - 24px));
  }

  .dialogue-controls {
    width: 100%;
  }

  .dialogue-volume-control {
    width: 100%;
    justify-content: space-between;
  }

  .dialogue-volume-control input[type="range"] {
    flex: 1 1 auto;
    width: auto;
  }

  .tutorial-action-arrow {
    top: -25px;
    font-size: 17px;
  }

  .tutorial-arrow {
    top: -20px;
    font-size: 30px;
  }

  .piece-action-tray {
    justify-content: flex-start;
    padding: 0 6px 2px;
  }

  .piece-action-tray-btn,
  .piece-action-tray-close {
    min-height: 44px;
  }
}

.mobile-shell {
  max-width: 980px;
}

.mobile-play-shell,
.mobile-lobby-grid {
  display: grid;
  gap: 16px;
}

.mobile-new-game-grid {
  grid-template-columns: 1fr;
}

.mobile-board-panel {
  position: relative;
}

.mobile-board-panel .board-header {
  position: sticky;
  top: 8px;
  z-index: 4;
  padding: 12px;
  margin: -12px -12px 12px;
  border-radius: 14px;
  background: rgba(22, 21, 18, 0.92);
  backdrop-filter: blur(8px) saturate(1.05);
  -webkit-backdrop-filter: blur(8px) saturate(1.05);
}

.mobile-board-panel .spawn-summary {
  position: sticky;
  top: 92px;
  z-index: 3;
  padding: 8px 12px 12px;
  margin: 0 -12px 12px;
  background: linear-gradient(180deg, rgba(22, 21, 18, 0.92), rgba(22, 21, 18, 0.84));
  backdrop-filter: blur(8px) saturate(1.02);
  -webkit-backdrop-filter: blur(8px) saturate(1.02);
}

.mobile-shell .panel,
.mobile-shell .mini-panel {
  background: linear-gradient(180deg, rgba(38, 36, 33, 0.96), rgba(28, 26, 23, 0.96));
  border-color: rgba(255, 255, 255, 0.09);
}

.mobile-shell {
  --text: #f5efe5;
  --muted: #b9b1a7;
  --bg: #141311;
  --bg-alt: #1a1815;
  --panel: #25221e;
  --panel-soft: #2c2823;
}

@media (max-width: 720px) {
  .mobile-shell {
    padding-bottom: 14px;
  }

  .mobile-board-panel .board-header {
    top: 0;
    margin-top: -12px;
  }

  .mobile-board-panel .spawn-summary {
    top: 84px;
  }

  .mobile-room-actions {
    width: 100%;
    justify-content: flex-start;
  }
}