/* ══════════════════════════════════════════════
   Defense Protocol — Game Styles
   ══════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-deep:   #050810;
  --bg-dark:   #0a0e1a;
  --bg-panel:  #0d1628;
  --bg-card:   #111e38;
  --border:    #1e3060;
  --border-hi: #2a5090;
  --text:      #c8d8f0;
  --text-dim:  #5a7aaa;
  --accent:    #4a9aff;
  --accent-hi: #6ab4ff;
  --green:     #3ddc68;
  --red:       #ff4a4a;
  --yellow:    #f0d050;
  --orange:    #ff9030;
  --purple:    #c060ff;
  --panel-w:   220px;
  --topbar-h:  48px;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg-deep);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 13px;
  user-select: none;
}

/* ── Layout ── */
#app {
  position: relative;   /* anchor for toast and kill-feed */
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

#topbar {
  flex: 0 0 var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  background: var(--bg-panel);
  border-bottom: 2px solid var(--border);
  z-index: 10;
}

#main-row {
  flex: 1;
  min-height: 0;      /* critical: lets flex children respect parent height */
  display: flex;
  overflow: hidden;
}

#sidebar {
  flex: 0 0 var(--panel-w);
  min-height: 0;      /* allows overflow-y: auto to actually scroll */
  display: flex;
  flex-direction: column;
  background: var(--bg-panel);
  border-right: 2px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
}
#sidebar::-webkit-scrollbar { width: 4px; }
#sidebar::-webkit-scrollbar-track { background: transparent; }
#sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ── Ability inventory panel ── */
#ability-panel {
  flex: 0 0 72px;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--panel-bg);
  border-right: 2px solid var(--border);
  padding: 6px 4px;
  gap: 4px;
  overflow-y: auto;
  overflow-x: hidden;
}
#ability-panel::-webkit-scrollbar { width: 3px; }
#ability-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.ab-title {
  font-size: 9px;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  margin-bottom: 4px;
  text-align: center;
}

#ability-slots {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  width: 100%;
}

.ability-btn {
  width: 60px;
  min-height: 52px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  padding: 4px 2px;
  transition: border-color 0.1s, background 0.1s;
}
.ability-btn:hover { border-color: var(--accent); background: rgba(74,154,255,0.08); }
.ability-btn:active { background: rgba(74,154,255,0.18); }

.ab-icon  { font-size: 18px; line-height: 1; }
.ab-label { font-size: 9px; color: var(--text-dim); text-align: center; }
.ab-count { font-size: 11px; font-weight: 700; color: var(--yellow); }

.ab-empty {
  font-size: 9px;
  color: var(--text-dim);
  opacity: 0.5;
  text-align: center;
  padding-top: 8px;
}

#canvas-wrap {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: #060c1a;
}

canvas#game {
  display: block;
  image-rendering: pixelated;
  cursor: crosshair;
}

/* ── Topbar items ── */
.tb-group {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
}
.tb-icon { width: 18px; height: 18px; image-rendering: pixelated; }
.tb-label { font-size: 11px; color: var(--text-dim); }
.tb-val {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-hi);
  min-width: 36px;
  text-align: right;
}
.tb-val.red  { color: var(--red); }
.tb-val.green{ color: var(--green); }
.tb-val.yellow{ color: var(--yellow); }

.tb-sep { flex: 1; }

.tb-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.btn-small {
  padding: 5px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-hi);
  border-radius: 5px;
  color: var(--text);
  font-size: 12px;
  cursor: pointer;
  transition: background 0.1s;
}
.btn-small:hover { background: var(--border); }

.btn-speed {
  padding: 3px 8px;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.1s;
}
.btn-speed:hover { border-color: var(--border-hi); color: var(--text); }
.btn-speed.active { background: var(--accent); border-color: var(--accent-hi); color: #fff; }

/* ── Sidebar sections ── */
.sb-section {
  padding: 10px;
  border-bottom: 1px solid var(--border);
}
.sb-title {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 5px;
}

/* Accordion sections */
.sb-toggle {
  cursor: pointer;
  user-select: none;
  margin-bottom: 0;
}
.sb-toggle::after {
  content: '▶';
  margin-left: auto;
  font-size: 7px;
  opacity: 0.4;
  transition: transform 0.15s;
}
.sb-section.open .sb-toggle::after { transform: rotate(90deg); }
.sb-acc { display: none; margin-top: 6px; }
.sb-section.open .sb-acc { display: block; }

/* Tower cards */
.tower-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 8px;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: border-color 0.1s, background 0.1s;
  margin-bottom: 5px;
}
.tower-card:hover { border-color: var(--border-hi); background: #162040; }
.tower-card.selected { border-color: var(--accent); background: #0f2050; }
.tower-card.disabled { opacity: 0.45; cursor: not-allowed; }
.tower-card img { width: 28px; height: 28px; image-rendering: pixelated; }
.tower-info { flex: 1; }
.tower-name { font-size: 12px; font-weight: 600; color: var(--text); }
.tower-meta { font-size: 10px; color: var(--text-dim); margin-top: 2px; }
.tower-cost {
  font-size: 12px;
  font-weight: 700;
  color: var(--yellow);
  display: flex;
  align-items: center;
  gap: 2px;
}
.tower-cost img { width: 12px; height: 12px; image-rendering: pixelated; }

/* Upgrade cards */
.upgrade-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 5px;
  transition: border-color 0.1s;
}
.upgrade-card:hover { border-color: var(--border-hi); }
.upgrade-card.disabled { opacity: 0.4; cursor: not-allowed; }
.upg-left { }
.upg-name { font-size: 12px; color: var(--text); }
.upg-desc { font-size: 10px; color: var(--text-dim); }
.upg-cost {
  font-size: 12px;
  font-weight: 700;
  color: var(--yellow);
  white-space: nowrap;
}
.upg-cost img { width: 12px; height: 12px; image-rendering: pixelated; vertical-align: text-top; margin-right: 1px; }

/* Wave info */
.wave-bar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  height: 8px;
  overflow: hidden;
  margin: 6px 0;
}
.wave-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent-hi) 100%);
  transition: width 0.3s;
}

/* Selected tower info */
#selected-info {
  font-size: 11px;
  color: var(--text-dim);
  text-align: center;
  padding: 8px;
}

/* Kill indicator overlay */
#kill-feed {
  position: absolute;
  top: 56px;          /* just below topbar */
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
  z-index: 25;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.kill-pop {
  color: var(--yellow);
  font-size: 15px;
  font-weight: 700;
  text-shadow: 0 0 8px rgba(240,208,80,0.9);
  animation: popUp 0.8s ease forwards;
  text-align: center;
  white-space: nowrap;
}
@keyframes popUp {
  0%   { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-24px); }
}

/* Overlay screens */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(5, 8, 16, 0.88);
  backdrop-filter: blur(4px);
  z-index: 20;
}
.overlay h2 {
  font-size: 32px;
  font-weight: 900;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.overlay.green h2 { color: var(--green); text-shadow: 0 0 20px rgba(61,220,104,0.6); }
.overlay.red   h2 { color: var(--red);   text-shadow: 0 0 20px rgba(255,74,74,0.6); }
.overlay.blue  h2 { color: var(--accent); text-shadow: 0 0 20px rgba(74,154,255,0.6); }
.overlay.blue .btn-primary,
.overlay.blue .btn-secondary { margin-top: 9px; }
.overlay.red .btn-primary,
.overlay.red .btn-secondary { margin-top: 9px; }

.overlay p { color: var(--text-dim); font-size: 14px; margin-bottom: 20px; }

.btn-primary {
  padding: 12px 32px;
  background: linear-gradient(135deg, #1a5cd8, #2a7aff);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 1px;
  text-transform: uppercase;
  box-shadow: 0 4px 16px rgba(42,122,255,0.4);
  transition: all 0.15s;
  margin: 4px;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(42,122,255,0.5); }
.btn-secondary {
  padding: 10px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-hi);
  border-radius: 8px;
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  margin: 4px;
  transition: background 0.1s;
}
.btn-secondary:hover { background: var(--border); }

/* Shield pulse */
@keyframes shieldPulse {
  0%, 100% { box-shadow: 0 0 10px rgba(100,180,255,0.4); }
  50%       { box-shadow: 0 0 24px rgba(100,180,255,0.9); }
}
.shield-active #canvas-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 3px solid rgba(100,180,255,0.5);
  border-radius: 4px;
  animation: shieldPulse 1s infinite;
  pointer-events: none;
}

/* Tooltip */
.tooltip {
  position: absolute;
  background: var(--bg-card);
  border: 1px solid var(--border-hi);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 11px;
  color: var(--text);
  pointer-events: none;
  z-index: 50;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

/* Notification toast — centered in the full app window */
#toast {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-card);
  border: 1px solid var(--border-hi);
  border-radius: 10px;
  padding: 10px 24px;
  font-size: 14px;
  color: var(--text);
  z-index: 35;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
#toast.show { opacity: 1; }

/* Wave ready button */
#btn-wave {
  width: calc(100% - 20px);
  margin: 10px;
  padding: 10px;
  background: linear-gradient(135deg, #1a6e30, #2aaa48);
  border: none;
  border-radius: 7px;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 3px 12px rgba(42,170,72,0.4);
  transition: all 0.15s;
}
#btn-wave:hover { transform: translateY(-1px); }
#btn-wave:disabled {
  background: var(--bg-card);
  color: var(--text-dim);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

/* Enemy health bars handled in canvas */

/* ── Leaderboard ── */
.lb-table {
  border-collapse: collapse;
  width: 100%;
  max-width: 480px;
  margin: 10px 0 18px;
  font-size: 13px;
}
.lb-table th {
  color: var(--accent);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 4px 14px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.lb-table td {
  padding: 6px 14px;
  color: var(--text);
  text-align: center;
  border-bottom: 1px solid rgba(30,48,96,0.3);
}
.lb-table td:nth-child(2) { text-align: left; }
.lb-table tbody tr:hover td { background: rgba(74,154,255,0.06); }
.lb-rank-1 td { color: var(--yellow) !important; font-weight: 700; }
.lb-rank-2 td { color: #c0c0c0 !important; font-weight: 600; }
.lb-rank-3 td { color: #cd7f32 !important; font-weight: 600; }
.lb-rank-me td { color: var(--accent-hi) !important; }

.lb-input-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin: 14px 0 10px;
}
.lb-input-row input {
  background: var(--bg-card);
  border: 1px solid var(--border-hi);
  border-radius: 6px;
  color: var(--text);
  font-size: 14px;
  padding: 8px 14px;
  outline: none;
  width: 200px;
  font-family: inherit;
}
.lb-input-row input:focus { border-color: var(--accent); }
.lb-empty { color: var(--text-dim); font-size: 13px; margin: 16px 0; }

/* ── Multiplayer ──────────────────────────────── */
.mp-room-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
  margin-bottom: 5px;
}
.mp-room-info { display: flex; flex-direction: column; font-size: 12px; color: var(--text); }
.mp-empty { color: var(--text-dim); font-size: 12px; text-align: center; padding: 10px 0; }

/* In-game players panel */
.mp-player-row {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--text);
  padding: 2px 0;
}
.mp-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.mp-pname { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mp-pscore { color: var(--yellow); font-weight: 700; font-size: 10px; }

/* Color picker in lobby */
.mp-color-picker { margin: 10px 0 8px; text-align: center; }
.mp-color-label { font-size: 11px; color: #5a7aaa; margin-bottom: 6px; }
.mp-color-circles { display: flex; justify-content: center; gap: 12px; }
.mp-color-btn {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.1s, border-color 0.1s, box-shadow 0.1s;
  padding: 0;
}
.mp-color-btn:hover:not(.taken) { transform: scale(1.15); }
.mp-color-btn.selected { border-color: #fff; box-shadow: 0 0 8px rgba(255,255,255,0.5); }
.mp-color-btn.taken { opacity: 0.25; cursor: not-allowed; }