/* ═══════════════════════════════════════════════════════════════
   AGGRESSOR Chess  –  style.css
   Dark glassmorphism theme, fully responsive
   ═══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

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

:root {
  --bg-dark:     #0b0d17;
  --bg-grad:     radial-gradient(ellipse at top left, #1a2238 0%, #0b0d17 100%);
  --panel-bg:    rgba(15, 18, 29, 0.6);
  --panel-bd:    rgba(255, 255, 255, 0.08);
  --sq-dark:     rgba(36, 48, 70, 0.85);
  --sq-light:    rgba(82, 102, 138, 0.85);
  --accent:      #5a9bff;
  --accent-glow: rgba(90, 155, 255, 0.25);
  --accent2:     #2dd881;
  --gold:        #ffcc33;
  --danger:      #ff4f4f;
  --text:        #f0f3ff;
  --text-dim:    #8b99bd;
  --w-piece:     #ffffff;
  --b-piece:     #0c0d16;
  --radius:      16px;
  --gap:         16px;
  --sq:          min(calc((100vw - 380px - 60px) / 8), calc((100vh - 80px) / 8));
}

@media (max-width: 800px) {
  :root {
    --sq: min(calc(96vw / 8), calc((50vh - 40px) / 8));
  }
}

html, body { 
  height: 100%; 
  background: var(--bg-dark); 
  background-image: var(--bg-grad);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif; 
  overflow: hidden; 
}

body::before {
  content: ''; position: fixed; top: 30%; left: 30%; 
  width: 70vw; height: 70vw; transform: translate(-50%, -50%);
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 60%);
  z-index: -1; pointer-events: none;
}

/* ── App Shell ────────────────────────────────────────────────── */
#app { display: flex; flex-direction: column; height: 100vh; width: 100vw; }

/* ── Top Bar ──────────────────────────────────────────────────── */
#topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 0 20px; height: 52px; flex-shrink: 0;
  background: rgba(10, 12, 19, 0.4);
  border-bottom: 1px solid var(--panel-bd);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
#logo { font-size: 1.15rem; font-weight: 700; color: var(--accent); letter-spacing: .03em; }
#mode-toggle { display: flex; gap: 6px; margin-left: auto; }
.mode-btn {
  padding: 5px 16px; border-radius: 20px; border: 1px solid var(--panel-bd);
  background: transparent; color: var(--text-dim); font-size: .82rem;
  cursor: pointer; transition: all .18s;
}
.mode-btn.active, .mode-btn:hover {
  background: var(--accent); border-color: var(--accent); color: #06091a; font-weight: 600;
}
#engine-badge { display: flex; align-items: center; gap: 6px; font-size: .78rem; color: var(--text-dim); }
.badge-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-dim); animation: pulse-dot 2s infinite; box-shadow: 0 0 6px var(--text-dim); }
.badge-dot.ready { background: var(--accent2); box-shadow: 0 0 10px var(--accent2); }
@keyframes pulse-dot { 0%,100%{opacity:1} 50%{opacity:.4} }

/* ── Main Layout ──────────────────────────────────────────────── */
#layout {
  display: flex; flex: 1; gap: var(--gap); padding: var(--gap);
  align-items: flex-start; overflow: hidden;
}
@media (max-width: 800px) {
  #layout { flex-direction: column; overflow-y: auto; align-items: center; }
}

/* ── Board ────────────────────────────────────────────────────── */
#board-col { display: flex; flex-direction: column; align-items: center; flex-shrink: 0; }
#board-wrap { display: flex; align-items: center; gap: 4px; }

#board-grid {
  display: grid;
  grid-template-columns: repeat(8, var(--sq));
  grid-template-rows:    repeat(8, var(--sq));
  border: 1px solid rgba(255,255,255,0.06);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 0 1px rgba(90,155,255,.08);
  border-radius: 4px; overflow: hidden;
}

.rank-label-col { display: flex; flex-direction: column; width: 18px; }
.rank-label-col span, .file-label-row span {
  display: flex; align-items: center; justify-content: center;
  width: 18px; height: var(--sq);
  font-size: .68rem; color: var(--text-dim); font-family: 'JetBrains Mono', monospace;
}
#file-labels { display: flex; margin-left: 22px; margin-top: 3px; }
#file-labels span { width: var(--sq); text-align: center; font-size: .68rem; color: var(--text-dim); font-family: 'JetBrains Mono', monospace; }

/* ── Square ───────────────────────────────────────────────────── */
.sq {
  width: var(--sq); height: var(--sq);
  display: flex; align-items: center; justify-content: center;
  position: relative; cursor: pointer;
  transition: background .1s;
}
.sq.light { background: var(--sq-light); }
.sq.dark  { background: var(--sq-dark); }

/* Highlights */
.sq.selected       { background: rgba(255,210,60,.68) !important; }
.sq.last-from      { background: rgba(195,155,55,.45) !important; }
.sq.last-to        { background: rgba(235,190,55,.6)  !important; }
.sq.check          { background: rgba(232,69,69,.75)  !important; }
.sq.hover          { filter: brightness(1.18); }

/* Legal move dot/ring */
.sq.legal::after {
  content: '';
  position: absolute;
  width: 30%; height: 30%;
  border-radius: 50%;
  background: rgba(75,216,122,.7);
  pointer-events: none;
}
.sq.legal.has-piece::after {
  width: 88%; height: 88%;
  background: transparent;
  border: 4px solid rgba(75,216,122,.7);
}

/* ── Piece ────────────────────────────────────────────────────── */
.piece {
  font-size: calc(var(--sq) * .78);
  line-height: 1;
  user-select: none;
  pointer-events: none;
  text-shadow: 2px 3px 6px rgba(0,0,0,.8);
  transition: transform .12s ease;
  position: relative; z-index: 1;
}
.piece.white { color: var(--w-piece); }
.piece.black {
  color: var(--b-piece);
  -webkit-text-stroke: 1px rgba(200,210,255,.18);
  text-shadow: 2px 3px 6px rgba(0,0,0,1), 0 0 2px rgba(0,0,0,.9);
}
.sq.selected .piece,
.sq.hover    .piece { transform: translateY(-3px) scale(1.06); }

/* Move animation */
.piece.animating {
  position: fixed; z-index: 999; pointer-events: none;
  transition: left .2s cubic-bezier(.4,0,.2,1), top .2s cubic-bezier(.4,0,.2,1);
}

/* ── Panel ────────────────────────────────────────────────────── */
#panel {
  flex: 1; min-width: 280px; max-width: 420px;
  background: var(--panel-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--panel-bd);
  box-shadow: 0 16px 40px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.05);
  border-radius: var(--radius);
  padding: 16px; display: flex; flex-direction: column; gap: 12px;
  height: calc(100vh - 52px - var(--gap)*2);
  overflow-y: auto;
}
@media (max-width: 800px) {
  #panel { max-width: 100%; width: 100%; height: auto; }
  html, body { overflow: auto; }
  #app { height: auto; }
}

.panel-section { display: flex; flex-direction: column; gap: 6px; }
.section-label { font-size: .72rem; font-weight: 600; color: var(--text-dim);
                 text-transform: uppercase; letter-spacing: .06em; }
.hint { font-size: .68rem; color: var(--text-dim); }

/* Divider */
.divider { height: 1px; background: var(--panel-bd); }

/* ── Status Box ───────────────────────────────────────────────── */
#status-box { padding: 10px 0; }
#turn-indicator {
  font-size: 1rem; font-weight: 600; color: var(--text); text-align: center;
  margin-bottom: 8px;
}
#eval-bar-wrap {
  height: 14px; background: rgba(255,255,255,.06); border-radius: 7px;
  position: relative; overflow: hidden;
}
#eval-bar-fill {
  height: 100%; width: 50%; background: var(--w-piece);
  border-radius: 7px; transition: width .4s ease;
}
#eval-label {
  position: absolute; top: -1px; left: 50%; transform: translateX(-50%);
  font-size: .66rem; color: var(--text-dim); pointer-events: none;
  font-family: 'JetBrains Mono', monospace;
}

/* ── Difficulty Buttons ───────────────────────────────────────── */
#diff-buttons { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 5px; }
.diff-btn {
  padding: 6px 4px; border: 1px solid var(--panel-bd);
  background: rgba(255,255,255,.03); color: var(--text-dim);
  border-radius: 8px; font-size: .74rem; cursor: pointer;
  transition: all .15s; text-align: center;
}
.diff-btn:hover { border-color: var(--accent); color: var(--accent); }
.diff-btn.active {
  background: var(--accent); border-color: var(--accent);
  color: #06091a; font-weight: 600;
}

/* ── Aggression Slider ────────────────────────────────────────── */
#threshold-slider {
  width: 100%; accent-color: var(--accent);
  cursor: pointer; margin: 2px 0;
}

/* ── Move List ────────────────────────────────────────────────── */
#move-list {
  flex: 1; background: rgba(0,0,0,.2);
  border: 1px solid var(--panel-bd); border-radius: 8px;
  padding: 8px; overflow-y: auto; min-height: 100px; max-height: 220px;
  font-family: 'JetBrains Mono', monospace; font-size: .8rem;
}
.move-row { display: flex; gap: 6px; padding: 2px 0; }
.move-num { color: var(--text-dim); min-width: 28px; }
.move-w { color: var(--text); min-width: 58px; cursor: pointer; }
.move-w:hover { color: var(--accent); }
.move-b { color: var(--text-dim); min-width: 58px; cursor: pointer; }
.move-b:hover { color: var(--accent); }
.move-current { color: var(--gold) !important; font-weight: 600; }

/* ── Captured ─────────────────────────────────────────────────── */
.cap-label { font-size: .7rem; color: var(--text-dim); margin-right: 4px; }
#captured-w, #captured-b {
  display: flex; align-items: center; flex-wrap: wrap;
  font-size: 1.05rem; gap: 1px;
}

/* ── Action Buttons ───────────────────────────────────────────── */
#action-buttons, #install-wrap { display: flex; gap: 6px; flex-wrap: wrap; }
.action-btn {
  flex: 1; min-width: 80px; padding: 10px 12px;
  border-radius: 10px; border: 1px solid;
  font-size: .8rem; font-weight: 600; cursor: pointer;
  transition: all .2s cubic-bezier(0.17, 0.67, 0.83, 0.67); 
  background: rgba(255,255,255,.03);
  text-transform: uppercase; letter-spacing: 0.05em; font-size: 0.72rem;
}
.action-btn.green  { color: var(--accent2);  border-color: rgba(45,216,129,0.3); }
.action-btn.blue   { color: var(--accent);   border-color: rgba(90,155,255,0.3); }
.action-btn.purple { color: #d094ff;         border-color: rgba(208,148,255,0.3); }
.action-btn.gold   { color: var(--gold);     border-color: rgba(255,204,51,0.3); }

.action-btn:hover { 
  transform: translateY(-2px); 
  box-shadow: 0 4px 12px rgba(0,0,0,0.2); 
  background: rgba(255,255,255,.08); 
}
.action-btn.green:hover { border-color: var(--accent2); box-shadow: 0 4px 16px rgba(45,216,129,0.2); }
.action-btn.blue:hover { border-color: var(--accent); box-shadow: 0 4px 16px rgba(90,155,255,0.2); }
.action-btn.gold:hover { border-color: var(--gold); box-shadow: 0 4px 16px rgba(255,204,51,0.2); }

/* ── Overlays ─────────────────────────────────────────────────── */
.overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 100; backdrop-filter: blur(6px);
  animation: fadein .2s ease;
}
.overlay.hidden { display: none; }
@keyframes fadein { from{opacity:0} to{opacity:1} }

.overlay-box {
  background: var(--panel-bg); border: 1px solid var(--panel-bd);
  border-radius: 20px; padding: 32px 40px;
  box-shadow: 0 24px 64px rgba(0,0,0,.6);
  text-align: center; max-width: 90vw;
}
.overlay-title { font-size: 1.4rem; font-weight: 700; color: var(--gold);
                 margin-bottom: 20px; }

/* Promo choices */
#promo-choices { display: flex; gap: 12px; justify-content: center; }
.promo-btn {
  width: 80px; height: 80px; border-radius: 12px;
  border: 2px solid var(--accent); background: rgba(90,155,255,.1);
  font-size: 3rem; display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all .15s; color: var(--w-piece);
}
.promo-btn:hover { background: var(--accent); color: #06091a; transform: scale(1.1); }
.promo-btn.black-piece { color: var(--b-piece); -webkit-text-stroke: 1px rgba(200,210,255,.2); }

/* Game Over box */
#gameover-msg { font-size: 1rem; color: var(--text); }

/* ── Scrollbar ────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--panel-bd); border-radius: 3px; }

/* ── Loading spinner ──────────────────────────────────────────── */
#loading-spinner {
  position: fixed; inset: 0; background: var(--bg);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 16px; z-index: 200;
}
.spinner {
  width: 44px; height: 44px; border: 3px solid var(--panel-bd);
  border-top-color: var(--accent); border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 1rem; color: var(--text-dim); }

/* ── Openings Panel ──────────────────────────────────────────── */
#openings-panel {
  flex: 1; min-width: 280px; max-width: 420px;
  background: var(--panel-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--panel-bd);
  box-shadow: 0 16px 40px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.05);
  border-radius: var(--radius);
  padding: 16px; display: flex; flex-direction: column; gap: 12px;
  height: calc(100vh - 52px - var(--gap)*2);
  overflow-y: auto;
}
@media (max-width: 800px) {
  #openings-panel { max-width: 100%; width: 100%; height: auto; }
}

#opening-filter { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 5px; }

#opening-list { display: flex; flex-direction: column; gap: 6px; overflow-y: auto; }

.opening-item {
  padding: 10px 12px; border-radius: 10px;
  border: 1px solid var(--panel-bd);
  background: rgba(255,255,255,.03);
  cursor: pointer; transition: all .15s;
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
.opening-item:hover { border-color: var(--accent); background: rgba(90,155,255,.08); }
.opening-item-name { font-size: .82rem; font-weight: 600; color: var(--text); }
.opening-item-eco  { font-size: .68rem; color: var(--text-dim); font-family: 'JetBrains Mono', monospace; }
.opening-badge {
  font-size: .66rem; font-weight: 700; padding: 2px 8px; border-radius: 20px;
  text-transform: uppercase; letter-spacing: .05em; flex-shrink: 0;
}
.opening-badge.aggressive { background: rgba(255,79,79,.15); color: #ff6b6b; border: 1px solid rgba(255,79,79,.3); }
.opening-badge.passive    { background: rgba(90,155,255,.15); color: var(--accent); border: 1px solid rgba(90,155,255,.3); }

#opening-detail-view { flex-direction: column; gap: 12px; }
#opening-detail-header {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  padding-bottom: 10px; border-bottom: 1px solid var(--panel-bd);
}
#opening-detail-name { font-size: 1rem; font-weight: 700; color: var(--text); }
#opening-detail-eco  { font-size: .72rem; color: var(--text-dim); font-family: 'JetBrains Mono', monospace; }
#opening-detail-desc {
  font-size: .78rem; color: var(--text-dim); line-height: 1.55;
  padding: 8px 0;
}

#opening-moves-strip {
  display: flex; flex-wrap: wrap; gap: 4px;
  background: rgba(0,0,0,.2); border: 1px solid var(--panel-bd);
  border-radius: 8px; padding: 10px;
  font-family: 'JetBrains Mono', monospace; font-size: .78rem;
  min-height: 44px;
}
.move-token {
  padding: 2px 6px; border-radius: 5px; cursor: pointer;
  color: var(--text-dim); transition: all .12s;
}
.move-token:hover { color: var(--text); background: rgba(255,255,255,.06); }
.move-token.active { background: var(--accent); color: #06091a; font-weight: 700; }
.move-token.played { color: var(--text); }
.move-num-token    { color: var(--text-dim); opacity: .5; }

#opening-nav-row {
  display: flex; align-items: center; gap: 8px;
}
#opening-nav-row .action-btn { flex: 0 0 48px; padding: 10px 0; text-align: center; }
#opening-step-info {
  flex: 1; text-align: center; font-size: .78rem; color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
}

/* ── Thinking pulse ───────────────────────────────────────────── */
@keyframes thinking-glow {
  0%,100% { box-shadow: 0 0 0 0 rgba(90,155,255,0); }
  50%      { box-shadow: 0 0 12px 4px rgba(90,155,255,.35); }
}
#board-grid.thinking { animation: thinking-glow 1.2s infinite; }