/* ─────────────────────────────────────────────
   style.css  —  Chess Engine (C++ / WASM)
───────────────────────────────────────────── */

/* ── Reset ──────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Base ────────────────────────────────── */
body {
  font-family: sans-serif;
  background: #1a1a2e;
  color: #eee;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 24px 16px;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 100%;
  max-width: 520px;
}

/* ── Header ──────────────────────────────── */
header {
  text-align: center;
}

h1 {
  font-size: 22px;
  font-weight: 500;
  color: #fff;
}

#subtitle {
  font-size: 12px;
  color: #7a7aaa;
  margin-top: 2px;
}

/* ── Loading overlay ─────────────────────── */
#loader {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 20, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

#loader.hidden {
  display: none;
}

#loader-box {
  text-align: center;
  color: #ccc;
  font-size: 14px;
}

#spinner {
  width: 36px;
  height: 36px;
  border: 3px solid #333;
  border-top-color: #7a7aff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 12px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Status bar ──────────────────────────── */
#status {
  font-size: 14px;
  color: #ccc;
  min-height: 20px;
  text-align: center;
}

/* ── Board outer (board + rank labels) ────── */
#board-outer {
  display: flex;
  gap: 4px;
  align-items: flex-start;
}

/* ── Rank labels ─────────────────────────── */
#ranks {
  display: flex;
  flex-direction: column;
  width: 18px;
}

#ranks span {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: #666;
}

/* ── The chess board ─────────────────────── */
#board {
  display: grid;
  grid-template-columns: repeat(8, 60px);
  grid-template-rows: repeat(8, 60px);
  border: 1px solid #333;
  user-select: none;
}

/* ── Individual squares ──────────────────── */
.sq {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  font-size: 40px;
  line-height: 1;
  transition: filter 0.05s;
}

.sq:hover {
  filter: brightness(1.12);
}

.white-piece {
  color: #fff;
  text-shadow: 0 0 2px rgba(0, 0, 0, 0.4);
}

.black-piece {
  color: #000;
}

/* ── Move hint overlays ──────────────────── */
/* Dot on empty reachable square */
.hint-dot {
  position: absolute;
  width: 33%;
  height: 33%;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.25);
  pointer-events: none;
}

/* Ring around a capturable enemy piece */
.hint-cap {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 5px solid rgba(0, 0, 0, 0.28);
  pointer-events: none;
}

/* ── File labels (a–h) ───────────────────── */
#files {
  display: flex;
  padding-left: 22px; /* align under the board */
}

#files span {
  width: 60px;
  text-align: center;
  font-size: 11px;
  color: #666;
}

/* ── Controls ────────────────────────────── */
#controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 4px;
}

.btn {
  padding: 8px 18px;
  font-size: 13px;
  cursor: pointer;
  border: 1px solid #444;
  border-radius: 8px;
  background: #2a2a4a;
  color: #eee;
  transition: background 0.15s;
}

.btn:hover {
  background: #3a3a6a;
}

.label {
  font-size: 13px;
  color: #999;
}

select {
  padding: 7px 10px;
  font-size: 13px;
  background: #2a2a4a;
  color: #eee;
  border: 1px solid #444;
  border-radius: 8px;
  cursor: pointer;
}

/* ── Footer info ─────────────────────────── */
#info {
  font-size: 12px;
  color: #555;
  text-align: center;
}