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

:root {
  --bg:     #2c3e50;
  --panel:  #34495e;
  --border: #2c3e50;
  --accent: #e74c3c;
  --green:  #27ae60;
  --blue:   #2980b9;
  --text:   #ecf0f1;
  --dim:    #95a5a6;
  --light:  #f0d9b5;
  --dark:   #b58863;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Exo 2', sans-serif;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ─── Login ──────────────────────────────────────────────────────────────── */

#login {
  position: fixed; inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.login-box {
  background: var(--panel);
  border-top: 4px solid var(--accent);
  padding: 36px 40px 40px;
  width: 360px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.login-box h1 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
  text-align: center;
}

.field { margin-bottom: 20px; }

.field label {
  display: block;
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 8px;
}

.field input[type=text] {
  width: 100%;
  background: var(--bg);
  border: 1px solid #1a252f;
  border-bottom: 2px solid var(--blue);
  color: var(--text);
  padding: 10px 12px;
  font-family: 'Exo 2', sans-serif;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.field input[type=text]:focus { border-bottom-color: var(--accent); }

.color-pick { display: flex; gap: 10px; }

.color-pick > div {
  flex: 1;
  background: var(--bg);
  border: 2px solid #1a252f;
  padding: 14px 10px;
  text-align: center;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  transition: border-color 0.15s, color 0.15s;
  user-select: none;
}

.color-pick > div:hover  { border-color: var(--dim); }
.color-pick > div.active { border-color: var(--accent); color: var(--accent); }

.btn-connect {
  width: 100%;
  background: var(--accent);
  color: white;
  border: none;
  padding: 13px;
  font-family: 'Exo 2', sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
  cursor: pointer;
  margin-top: 6px;
  transition: background 0.15s;
}

.btn-connect:hover    { background: #c0392b; }
.btn-connect:disabled { background: var(--dim); cursor: default; }

.login-status {
  margin-top: 12px;
  font-size: 11px;
  text-align: center;
  color: var(--dim);
  font-family: 'Share Tech Mono', monospace;
  min-height: 16px;
}

/* ─── Game ───────────────────────────────────────────────────────────────── */

#game {
  display: none;
  flex-direction: column;
  height: 100vh;
}

/* header */
.header {
  background: var(--panel);
  border-bottom: 3px solid var(--accent);
  padding: 0 18px;
  height: 46px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-shrink: 0;
}

.header-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent);
  flex-shrink: 0;
}

.hsep { width: 1px; height: 20px; background: #1a252f; flex-shrink: 0; }

.hstat { font-size: 12px; color: var(--dim); white-space: nowrap; }
.hstat b { color: var(--text); font-weight: 600; }

#hPieceSymbol { font-size: 22px; line-height: 1; }

.hspacer { flex: 1; }

#hConnStatus { font-size: 11px; }

/* main content */
.main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* board area */
.board-wrap {
  flex: 1;
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}

#board {
  display: block;
  cursor: crosshair;
  border: 3px solid var(--panel);
  image-rendering: pixelated;
}

/* controls hint in header */
.ctrl-hint {
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--dim);
}

/* ─── Promotion modal ───────────────────────────────────────────────────── */

#promoOverlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(20,30,40,0.82);
  z-index: 200;
  align-items: center;
  justify-content: center;
}

#promoOverlay.visible { display: flex; }

.promo-box {
  background: var(--panel);
  border-top: 4px solid var(--green);
  padding: 28px 32px 32px;
  text-align: center;
  box-shadow: 0 12px 40px rgba(0,0,0,0.6);
}

.promo-box h2 {
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 6px;
}

.promo-box p {
  font-size: 12px;
  color: var(--dim);
  margin-bottom: 22px;
}

.promo-choices {
  display: flex;
  gap: 12px;
}

.promo-choice {
  background: var(--bg);
  border: 2px solid transparent;
  color: var(--text);
  width: 80px;
  height: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
  font-family: 'Exo 2', sans-serif;
  transition: border-color 0.15s, background 0.15s;
}

.promo-choice:hover {
  border-color: var(--green);
  background: rgba(39,174,96,0.1);
}

.promo-sym  { font-size: 36px; line-height: 1; }
.promo-name {
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--dim);
}

/* ─── Protocol log ──────────────────────────────────────────────────────── */

.log-area {
  border-top: 3px solid var(--border);
  flex-shrink: 0;
  height: 110px;
  display: none;   /* toggle with Ctrl+Shift+Space */
  flex-direction: column;
  background: #1a252f;
}

.log-head {
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--dim);
  padding: 4px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#log {
  flex: 1;
  overflow-y: auto;
  padding: 3px 14px 4px;
  font-family: 'Share Tech Mono', monospace;
  font-size: 11px;
  line-height: 1.65;
}

#log::-webkit-scrollbar       { width: 3px; }
#log::-webkit-scrollbar-thumb { background: var(--border); }

.ll     { color: #5d7d99; }
.ll-tx  { color: #3498db; }
.ll-rx  { color: #27ae60; }
.ll-ps  { color: #e67e22; }
.ll-err { color: var(--accent); }