:root {
  --bg: #10151c;
  --panel: #1a222d;
  --panel-edge: #2a3542;
  --text: #e8edf2;
  --muted: #8b98a5;
  --accent: #2ecc71;
  --accent-dark: #229955;
  --danger: #e05a4e;
  --felt: #127a43;
  --felt-dark: #0c5c32;
  --felt-edge: #084526;
}

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

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.hidden { display: none !important; }

/* ---- screens ---- */
.screen { display: none; min-height: 100dvh; flex-direction: column; }
.screen.active { display: flex; }
#screen-home.active { justify-content: center; align-items: center; padding: 16px; }

/* ---- panels ---- */
.panel {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 14px;
  padding: 28px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}
.home-panel { width: 100%; max-width: 380px; text-align: center; }

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 2rem;
  letter-spacing: 0.04em;
}
.logo-disc {
  width: 26px; height: 26px; border-radius: 50%;
  display: inline-block;
  box-shadow: inset 0 -3px 5px rgba(0,0,0,.4), 0 2px 4px rgba(0,0,0,.5);
}
.logo-disc.black { background: #181818; }
.logo-disc.white { background: #f5f5f5; }
.tagline { color: var(--muted); margin: 6px 0 24px; font-size: 0.9rem; }

.field-label {
  display: block; text-align: left;
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--muted); margin-bottom: 6px;
}

input[type="text"] {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--panel-edge);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  outline: none;
}
input[type="text"]:focus { border-color: var(--accent); }
#name-input { margin-bottom: 18px; }
#code-input {
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-weight: 700;
  text-align: center;
}

.btn {
  padding: 12px 18px;
  border: 1px solid var(--panel-edge);
  border-radius: 10px;
  background: #232e3b;
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s, transform 0.05s;
}
.btn:hover { filter: brightness(1.15); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: default; }
.btn-primary { background: var(--accent-dark); border-color: var(--accent-dark); width: 100%; }
.btn-small { padding: 6px 12px; font-size: 0.82rem; }
.btn-danger { background: transparent; border-color: var(--danger); color: var(--danger); }

.divider {
  display: flex; align-items: center; gap: 12px;
  color: var(--muted); font-size: 0.8rem;
  margin: 18px 0;
}
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--panel-edge); }

.join-row { display: flex; gap: 10px; }
.join-row input { flex: 1; }

.error { color: var(--danger); font-size: 0.88rem; min-height: 1.2em; margin-top: 12px; }

/* ---- game screen ---- */
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--panel-edge);
}
.room-info { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 0.9rem; }
.room-info strong { color: var(--text); letter-spacing: 0.15em; }

.waiting-banner {
  text-align: center;
  padding: 10px 16px;
  background: rgba(46, 204, 113, 0.12);
  color: var(--accent);
  font-size: 0.9rem;
}

.seats {
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: 14px;
  padding: 14px 16px 4px;
  flex-wrap: wrap;
}
.seat {
  display: flex; align-items: center; gap: 10px;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 12px;
  padding: 10px 14px;
  min-width: 170px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.seat.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), 0 0 14px rgba(46, 204, 113, 0.25); }
.seat.empty { opacity: 0.55; }
.seat-disc {
  width: 22px; height: 22px; border-radius: 50%;
  background: #181818; flex-shrink: 0;
  box-shadow: inset 0 -3px 4px rgba(0,0,0,.4), 0 1px 3px rgba(0,0,0,.5);
}
.seat-disc.white { background: #f5f5f5; }
.seat-disc.unassigned { background: transparent; border: 2px dashed var(--muted); box-shadow: none; }
.seat-text { display: flex; align-items: center; gap: 6px; font-size: 0.92rem; }
.seat-name.disconnected { color: var(--muted); text-decoration: line-through; }
.seat-status { font-size: 0.65rem; }
.seat-score { margin-left: auto; font-size: 1.25rem; font-weight: 700; min-width: 1.5ch; text-align: right; }

.game-status {
  display: flex; align-items: center;
  color: var(--muted);
  font-size: 0.95rem;
  padding: 0 6px;
}

/* ---- board ---- */
.board-wrap {
  position: relative;
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 14px 16px 24px;
}
.board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
  width: min(92vw, 62vh, 560px);
  aspect-ratio: 1;
  background: var(--felt-edge);
  border: 6px solid var(--felt-edge);
  border-radius: 10px;
  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.5);
}
.cell {
  position: relative;
  border: none;
  background: linear-gradient(145deg, var(--felt), var(--felt-dark));
  padding: 0;
  cursor: default;
}
.cell.legal { cursor: pointer; }
.cell.legal::after {
  content: "";
  position: absolute;
  inset: 32%;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.22);
  transition: background 0.15s, inset 0.15s;
}
.cell.legal:hover::after { background: rgba(255, 255, 255, 0.4); inset: 26%; }
.cell.last-move { box-shadow: inset 0 0 0 2px rgba(255, 235, 130, 0.85); }

/* Two-faced disc: rotates 180° when flipping black <-> white. */
.disc {
  position: absolute;
  inset: 10%;
  transform-style: preserve-3d;
  transition: transform 0.55s cubic-bezier(0.4, 0.1, 0.3, 1.2);
}
.disc.white { transform: rotateY(180deg); }
.disc .face {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  backface-visibility: hidden;
  box-shadow: inset 0 -4px 6px rgba(0, 0, 0, 0.35), 0 2px 5px rgba(0, 0, 0, 0.45);
}
.disc .face-b { background: radial-gradient(circle at 35% 30%, #3c3c3c, #101010 70%); }
.disc .face-w {
  background: radial-gradient(circle at 35% 30%, #ffffff, #d8d8d8 75%);
  transform: rotateY(180deg);
}
.disc.placed { animation: pop-in 0.25s ease-out; }
@keyframes pop-in {
  from { scale: 0.3; opacity: 0; }
  to { scale: 1; opacity: 1; }
}

/* ---- game over overlay ---- */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(10, 14, 19, 0.72);
  backdrop-filter: blur(3px);
  z-index: 10;
}
.gameover-panel { text-align: center; max-width: 320px; width: 90%; }
.gameover-panel h2 { margin-bottom: 8px; font-size: 1.6rem; }
.gameover-panel p { color: var(--muted); margin-bottom: 18px; }
.gameover-panel .btn { width: 100%; margin-bottom: 10px; }
.rematch-note { font-size: 0.85rem; min-height: 1.2em; }

/* ---- toasts ---- */
#toasts {
  position: fixed;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 100;
  pointer-events: none;
}
.toast {
  background: #0d1117;
  border: 1px solid var(--panel-edge);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.88rem;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
  animation: toast-in 0.25s ease-out;
  transition: opacity 0.5s, translate 0.5s;
}
.toast.gone { opacity: 0; translate: 0 8px; }
@keyframes toast-in {
  from { opacity: 0; translate: 0 10px; }
  to { opacity: 1; translate: 0 0; }
}

@media (max-width: 560px) {
  .seats { gap: 8px; padding: 10px 10px 2px; }
  .seat { min-width: 0; flex: 1; padding: 8px 10px; }
  .game-status { width: 100%; justify-content: center; order: 3; }
}