:root {
  --wood: #e3b061;
  --wood-edge: #b07d33;
  --line: #4a3211;
  --ink: #1c1407;
  --bg: #3b4a5e;        /* dark bluish grey (clearly blue-grey, not near-black) */
  --bg-edge: #313e4f;   /* slightly deeper, for the page gradient */
  --panel: #45556a;     /* lighter blue-grey panels/cards */
  --border: #57677c;
  --text: #e7e9ee;
  --muted: #aab2c0;
  --accent: #6ea8fe;
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(160deg, var(--bg) 0%, var(--bg-edge) 100%);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  display: flex;
  justify-content: center;
}

.wrap {
  width: 100%;
  max-width: 1100px;
  padding: 24px 24px 56px;
}

/* Two columns: all the text/controls on the left, the board on the right. */
.layout {
  display: flex;
  align-items: flex-start;
  gap: 32px;
}

.sidebar {
  width: 340px;
  flex: none;
}

.boardarea {
  flex: 1;
  min-width: 0;
  display: flex;
  justify-content: center;
}

.brand { text-align: left; }

/* "Back to home" sits on its own across the top-left of the page. The negative
   left margin breaks it out of the centered column so it hugs the browser's
   left edge (~16px) regardless of window width. */
.pagebar {
  margin-bottom: 18px;
  margin-left: calc(50% - 50vw + 16px);
}

/* Polished orange-metal button. */
.btn-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.3px;
  color: #3a1c00;
  padding: 9px 18px;
  border-radius: 9px;
  border: 1px solid #7a3f06;
  background:
    linear-gradient(180deg,
      #ffe1ad 0%,
      #ffb84d 16%,
      #fa8c16 50%,
      #d46b08 80%,
      #a84b00 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.6),
    inset 0 -2px 3px rgba(120, 50, 0, 0.5),
    0 2px 6px rgba(0, 0, 0, 0.5);
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.4);
  transition: filter 0.12s ease, transform 0.05s ease;
  flex: none;
  white-space: nowrap;
}

.btn-home:hover { filter: brightness(1.08) saturate(1.05); }

.btn-home:active {
  transform: translateY(1px);
  box-shadow:
    inset 0 1px 3px rgba(90, 40, 0, 0.6),
    0 1px 2px rgba(0, 0, 0, 0.45);
}

.btn-home:focus-visible {
  outline: 2px solid #ffd591;
  outline-offset: 2px;
}

h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: 0.5px;
}

h1 .sub {
  display: block;
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 4px;
}

.byline { margin: 6px 0 0; color: var(--muted); font-size: 0.9rem; }

.controls {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 18px 0 14px;
}

.ctl {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
  font-size: 0.9rem;
}

.ctl select { flex: 0 0 58%; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.actions .btn { flex: 1 1 auto; }

select, .btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.95rem;
  cursor: pointer;
}

.btn:hover { border-color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn:disabled:hover { border-color: var(--border); }

.status {
  text-align: center;
  min-height: 1.6em;
  margin-bottom: 12px;
  font-weight: 600;
}

.status .warn { color: #ffb454; font-weight: 600; }
.status .win { color: var(--accent); }
.status .note { color: var(--muted); font-weight: 400; }

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

.boardwrap {
  background: linear-gradient(160deg, var(--wood), var(--wood-edge));
  border-radius: 12px;
  padding: 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  display: flex;
  justify-content: center;
  width: 100%;
  max-width: 640px;
}

canvas {
  width: 100%;
  height: auto;
  display: block;
  touch-action: manipulation;
  cursor: pointer;
}

.caps {
  display: flex;
  justify-content: center;
  gap: 28px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.92rem;
}

.caps b { color: var(--text); }

/* Hamburger dropdown menus (How to play / Tips on how to win). */
.menus {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 6px 0;
}

.menu { position: relative; }

.menu > summary {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  user-select: none;
  list-style: none;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 14px;
  white-space: nowrap;
}

.menu > summary::-webkit-details-marker { display: none; }
.menu > summary:hover { border-color: var(--accent); }
.menu[open] > summary { border-color: var(--accent); }

/* Go-stones icon (black + white overlapping stones) on the menu buttons.
   Inlined as real SVG in the markup, so it can't be blocked or fail to load. */
.ham {
  width: 22px;
  height: 22px;
  flex: none;
  display: block;
}

.menu-panel {
  position: absolute;
  left: 0;
  top: calc(100% + 8px);
  z-index: 30;
  width: 360px;
  max-width: calc(100vw - 40px);
  max-height: 70vh;
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px 16px 12px;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.55);
  color: var(--muted);
  font-size: 0.9rem;
}

.menu-panel p { margin: 10px 0; }
.menu-panel ul { margin: 8px 0; padding-left: 20px; }
.menu-panel li { margin: 5px 0; }
.menu-panel b { color: var(--text); }

/* Stack the board under the controls on narrower screens. */
@media (max-width: 860px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; }
  .boardarea { width: 100%; justify-content: flex-start; }
  .boardwrap { max-width: 560px; }
}

@media (max-width: 520px) {
  .menus { width: 100%; }
  .menu { flex: 1; }
  .menu > summary { justify-content: center; width: 100%; }
  .menu-panel { width: calc(100vw - 40px); }
}