/* DZ-Chess — design system (Algerian green, dark mode, RTL-friendly) */

:root {
  --bg: #eef2f7;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --accent: #008744;
  --accent-soft: #e8f5e9;
  --danger: #dc2626;
  --sq-light: #f0d9b5;
  --sq-dark: #b58863;
  --hl: rgba(0, 135, 68, 0.5);
  --last: rgba(255, 200, 40, 0.45);
  --shadow: 0 10px 25px -8px rgba(15, 23, 42, 0.25);
}

[data-theme="dark"] {
  --bg: #0e1420;
  --card: #1a2233;
  --text: #e8eef7;
  --muted: #8fa0b8;
  --border: #2a3650;
  --accent-soft: rgba(0, 135, 68, 0.18);
  --sq-light: #46587a;
  --sq-dark: #22304a;
  --shadow: 0 10px 25px -8px rgba(0, 0, 0, 0.6);
}

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

body {
  font-family: 'Segoe UI', 'Cairo', 'Tahoma', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ---------------- topbar ---------------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 1.4rem;
  background: linear-gradient(135deg, var(--accent), #005a2e);
  color: #fff;
  box-shadow: var(--shadow);
}

.brand-title { font-weight: 800; font-size: 1.15rem; letter-spacing: 0.3px; }
.brand-subtitle { font-size: 0.75rem; opacity: 0.85; }
.topbar-actions { display: flex; align-items: center; gap: 0.5rem; }

.lang-switch {
  display: flex;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  padding: 2px;
}

.lang-btn {
  border: none;
  background: transparent;
  color: rgba(255, 255, 255, 0.75);
  font-weight: 700;
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
}

.lang-btn.active { background: #fff; color: var(--accent); }

.icon-btn {
  border: none;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
}

.icon-btn.muted { opacity: 0.5; }

/* ---------------- layout & board ---------------- */
.layout {
  display: grid;
  grid-template-columns: minmax(340px, 1fr) 320px;
  gap: 1.2rem;
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.2rem;
  align-items: start;
}

.status-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem 0.9rem;
  margin-bottom: 0.9rem;
  font-weight: 700;
}

.status-text.over { color: var(--accent); }

.turn-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--border);
  flex-shrink: 0;
}

.turn-dot.w { background: #fff; }
.turn-dot.b { background: #1a1a1a; }

.board-frame {
  display: flex;
  gap: 6px;
  justify-content: center;
  align-items: flex-start;
  direction: ltr !important;
}

.ranks, .files {
  display: grid;
  color: var(--muted);
  font-weight: 700;
  font-size: 0.75rem;
  direction: ltr !important;
  user-select: none;
}

.ranks {
  grid-template-rows: repeat(8, 1fr);
  align-items: center;
  text-align: center;
  width: 18px;
  height: min(88vw, 540px);
}
.files {
  grid-template-columns: repeat(8, 1fr);
  text-align: center;
  padding-top: 6px;
}

.board-wrap {
  display: flex;
  flex-direction: column;
  direction: ltr !important;
}

.board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  direction: ltr !important;
  width: min(88vw, 540px);
  aspect-ratio: 1;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow);
  user-select: none;
}

.controls-row {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  align-items: center;
  margin-top: 1rem;
}

.square { position: relative; display: flex; align-items: center; justify-content: center; cursor: pointer; }
.square.light { background: var(--sq-light); }
.square.dark { background: var(--sq-dark); }

.piece {
  font-size: min(9.5vw, 58px);
  line-height: 1;
  z-index: 2;
}

.piece.w { color: #fff; text-shadow: 0 0 1.5px #000, 0 1px 2px rgba(0, 0, 0, 0.55); }
.piece.b { color: #14181f; text-shadow: 0 1px 1px rgba(255, 255, 255, 0.25); }

.square.selected::before,
.square.last::before,
.square.in-check::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
}

.square.selected::before { background: var(--hl); }
.square.last::before { background: var(--last); }
.square.in-check::before { background: radial-gradient(circle, rgba(220, 38, 38, 0.8) 12%, transparent 70%); }

.square.target::after,
.square.capture-target::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  z-index: 1;
}

.square.target::after { width: 26%; height: 26%; background: var(--hl); }
.square.capture-target::after { inset: 6%; border: 4px solid var(--hl); }

/* ---------------- controls & panels ---------------- */
.controls-row { display: flex; gap: 0.6rem; margin-top: 0.9rem; flex-wrap: wrap; }

.btn {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.55rem 1.1rem;
  border-radius: 9px;
  cursor: pointer;
}

.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }

.side-panel { display: flex; flex-direction: column; gap: 1rem; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.95rem;
}

.card-title { font-size: 0.9rem; margin-bottom: 0.6rem; color: var(--accent); }

.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 0.55rem;
  font-weight: 700;
}

.select {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.45rem;
  font-size: 0.85rem;
}

.captured-row { display: flex; align-items: baseline; gap: 0.5rem; margin-bottom: 0.4rem; }
.captured-label { font-size: 0.75rem; color: var(--muted); font-weight: 700; min-width: 44px; }
.captured-pieces { font-size: 1.15rem; letter-spacing: 2px; min-height: 1.4rem; }

.advantage-row {
  display: flex;
  justify-content: space-between;
  border-top: 1px dashed var(--border);
  padding-top: 0.45rem;
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 700;
}

.advantage { font-size: 1rem; }

.moves-card { display: flex; flex-direction: column; }
.moves-list { max-height: 220px; overflow-y: auto; font-size: 0.85rem; }

.move-row { display: flex; gap: 0.55rem; padding: 0.18rem 0.3rem; font-variant-numeric: tabular-nums; }
.move-row:nth-child(odd) { background: var(--accent-soft); border-radius: 6px; }
.move-num { color: var(--muted); min-width: 26px; }

/* ---------------- overlays ---------------- */
.overlay, .banner {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.overlay.active, .banner.active { display: flex; }

.overlay-card, .banner-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.4rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.promo-title { margin-bottom: 0.9rem; }
.promo-row { display: flex; gap: 0.6rem; justify-content: center; }

.promo-btn {
  font-size: 2.6rem;
  width: 64px;
  height: 64px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--sq-light);
  cursor: pointer;
  color: #14181f;
}

.promo-btn:hover { border-color: var(--accent); transform: translateY(-2px); }

.banner-card h2 { margin-bottom: 1rem; color: var(--accent); }

/* ---------------- responsive ---------------- */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .board { width: min(92vw, 470px); }
  .side-panel { flex-direction: row; flex-wrap: wrap; }
  .card { flex: 1 1 240px; }
}