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

:root {
  --bg:        #0d0d14;
  --surface:   #16162a;
  --surface2:  #1e1e38;
  --border:    #2a2a4a;
  --accent:    #7c6aff;
  --accent-h:  #9e90ff;
  --green:     #22c55e;
  --red:       #ef4444;
  --yellow:    #facc15;
  --text:      #e2e2f0;
  --text-dim:  #8888aa;
  --radius:    12px;
  --shadow:    0 8px 32px rgba(0,0,0,0.4);
}

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

a { color: inherit; text-decoration: none; }

/* ─── Shared Utilities ─────────────────────────────── */
.hidden { display: none !important; }
.screen { width: 100%; min-height: 100vh; }

.center-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: opacity 0.15s, transform 0.1s, box-shadow 0.15s;
  user-select: none;
}
.btn:hover  { opacity: 0.9; transform: translateY(-1px); }
.btn:active { transform: scale(0.97); }

.btn-primary  { background: linear-gradient(135deg, var(--accent), #5b4fcf); color: #fff; box-shadow: 0 4px 16px rgba(124,106,255,0.35); }
.btn-primary:hover { box-shadow: 0 6px 24px rgba(124,106,255,0.5); }
.btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-ghost    { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn-small    { padding: 8px 16px; font-size: 13px; }
.full-width   { width: 100%; }
.btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none !important; }
.btn:disabled:hover { opacity: 0.35; box-shadow: none; }

/* ─── Home ─────────────────────────────────────────── */
.home-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(124,106,255,0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 80%, rgba(94,66,255,0.06) 0%, transparent 60%),
    var(--bg);
}

.home-container {
  text-align: center;
  padding: 48px 40px;
  max-width: 420px;
  width: 100%;
  background: rgba(22, 22, 42, 0.85);
  border: 1px solid rgba(124,106,255,0.2);
  border-radius: 20px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.5), 0 0 0 1px rgba(124,106,255,0.08);
  backdrop-filter: blur(20px);
}

.logo {
  font-size: 72px;
  margin-bottom: 12px;
  display: block;
  filter: drop-shadow(0 0 24px rgba(124,106,255,0.7));
  animation: float 4s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-10px); }
}

.title {
  font-size: 38px;
  font-weight: 800;
  letter-spacing: -1px;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent-h) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle { color: var(--text-dim); margin: 10px 0 36px; font-size: 15px; }

.home-actions { display: flex; flex-direction: column; gap: 14px; }

.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-dim);
  font-size: 13px;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.join-row { display: flex; gap: 8px; }

.room-input {
  flex: 1;
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.room-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(124,106,255,0.15); }
.room-input::placeholder { font-weight: 400; letter-spacing: 0; color: var(--text-dim); }

.join-error { color: var(--red); font-size: 13px; }

/* ─── Loading ───────────────────────────────────────── */
.spinner {
  width: 44px; height: 44px;
  border: 3px solid rgba(255,255,255,0.08);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { color: var(--text-dim); font-size: 15px; }

/* ─── Waiting ───────────────────────────────────────── */
.waiting-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 36px;
  max-width: 420px;
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow);
}
.waiting-icon { font-size: 48px; }
.waiting-card h2 { font-size: 22px; font-weight: 700; }
.waiting-hint { color: var(--text-dim); font-size: 13px; }

.room-code {
  font-size: 42px;
  font-weight: 800;
  letter-spacing: 0.25em;
  color: var(--accent-h);
  background: var(--surface2);
  padding: 16px;
  border-radius: 8px;
  border: 1px solid rgba(124,106,255,0.3);
  font-variant-numeric: tabular-nums;
}

.share-row { display: flex; gap: 8px; }

.share-input {
  flex: 1;
  padding: 10px 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-dim);
  font-size: 12px;
  outline: none;
  cursor: default;
  min-width: 0;
}

/* ─── Game Layout ───────────────────────────────────── */
.game-body { display: flex; flex-direction: column; min-height: 100vh; }

.game-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.back-link { color: var(--text-dim); font-size: 14px; transition: color 0.15s; }
.back-link:hover { color: var(--text); }
.header-title {
  font-size: 18px;
  font-weight: 800;
  flex: 1;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent-h) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.room-tag {
  font-size: 12px;
  color: var(--text-dim);
  background: var(--surface2);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 99px;
  letter-spacing: 0.1em;
  font-weight: 600;
}

.game-layout {
  flex: 1;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 28px;
  padding: 28px 24px;
  flex-wrap: wrap;
}

/* ─── Board ─────────────────────────────────────────── */
.board-section { display: flex; flex-direction: column; gap: 10px; }

#board-container {
  width: min(520px, calc(100vw - 48px));
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5), 0 0 0 2px rgba(124,106,255,0.15);
}

#board { width: 100%; }

/* chessboard.js square color overrides */
.white-1e1d7 { background-color: #eeeed2 !important; }
.black-3c85d { background-color: #769656 !important; }

/* click-to-move cursor */
[data-square] { cursor: pointer; position: relative; }

/* selected square */
[data-square].highlight-selected {
  background-color: rgba(124,106,255,0.65) !important;
}

/* legal move dot */
[data-square].highlight-move::before {
  content: '';
  position: absolute;
  width: 32%;
  height: 32%;
  background: rgba(0,0,0,0.28);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  pointer-events: none;
}

/* capture ring */
[data-square].highlight-capture::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  box-shadow: inset 0 0 0 5px rgba(0,0,0,0.28);
  z-index: 10;
  pointer-events: none;
}

.player-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 42px;
  padding: 0 4px;
}

.player-name { font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 8px; }

.player-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  border: 2px solid var(--border);
  flex-shrink: 0;
}
.player-dot.white { background: #f0f0f0; border-color: #bbb; }
.player-dot.black { background: #1a1a1a; border-color: #666; }

/* ─── Clock display ─────────────────────────────────── */
.clock-display {
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.05em;
  background: var(--surface2);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 4px 14px;
  min-width: 88px;
  text-align: center;
  transition: border-color 0.2s, color 0.2s, box-shadow 0.2s;
}
.clock-display.clock-active   { border-color: var(--accent); box-shadow: 0 0 12px rgba(124,106,255,0.25); }
.clock-display.clock-low      { border-color: var(--yellow); color: var(--yellow); }
.clock-display.clock-critical {
  border-color: var(--red);
  color: var(--red);
  animation: pulse-clock 0.6s ease-in-out infinite;
}
@keyframes pulse-clock {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

/* ─── Sidebar ───────────────────────────────────────── */
.sidebar {
  width: 220px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 52px;
}

.status-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 56px;
}

.turn-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 2px solid var(--border);
  background: var(--surface2);
}
.turn-dot.white { background: #f0f0f0; border-color: #ccc; }
.turn-dot.black { background: #1a1a1a; border-color: #555; }

#status-text { font-size: 14px; font-weight: 600; }

.status-card.your-turn  { border-color: var(--accent); box-shadow: 0 0 12px rgba(124,106,255,0.15); }
.status-card.check      { border-color: var(--yellow); }
.status-card.check #status-text { color: var(--yellow); }
.status-card.gameover   { border-color: var(--text-dim); }

/* ─── Move History ──────────────────────────────────── */
.move-history {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 120px;
  max-height: 340px;
}

.move-history-header {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 10px 14px 8px;
  border-bottom: 1px solid var(--border);
}

.move-list {
  overflow-y: auto;
  flex: 1;
  padding: 6px 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.move-list::-webkit-scrollbar { width: 4px; }
.move-list::-webkit-scrollbar-track { background: transparent; }
.move-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.move-row {
  display: grid;
  grid-template-columns: 28px 1fr 1fr;
  gap: 2px;
  padding: 3px 8px;
  border-radius: 4px;
  margin: 0 4px;
  transition: background 0.1s;
}
.move-row:hover { background: var(--surface2); }

.move-num {
  font-size: 12px;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
  padding: 3px 2px;
}

.move-san {
  font-size: 13px;
  font-weight: 600;
  padding: 3px 6px;
  border-radius: 4px;
  cursor: default;
  font-variant-numeric: tabular-nums;
}
.move-san:hover { background: rgba(124,106,255,0.12); }

/* ─── Game Overlay ──────────────────────────────────── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(6px);
}

.overlay-card {
  background: var(--surface);
  border: 1px solid rgba(124,106,255,0.25);
  border-radius: 20px;
  padding: 48px 40px;
  text-align: center;
  box-shadow: 0 24px 64px rgba(0,0,0,0.6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  max-width: 320px;
  width: 90%;
}

.overlay-icon { font-size: 56px; }
.overlay-msg  { font-size: 20px; font-weight: 700; }

#overlay-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  align-items: center;
}

.rematch-waiting {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-dim);
  font-size: 14px;
  padding: 8px 0;
}

.spinner-small {
  width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,0.1);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  flex-shrink: 0;
}

.rematch-hint {
  font-size: 13px;
  color: var(--green);
  font-weight: 600;
  margin-bottom: 4px;
}

/* ─── Error ─────────────────────────────────────────── */
.error-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  max-width: 360px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  box-shadow: var(--shadow);
}
.error-icon { font-size: 40px; color: var(--red); }
.error-text { color: var(--text-dim); font-size: 15px; }

/* ─── Time control picker ───────────────────────────── */
.setup-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  max-width: 500px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 20px;
  box-shadow: var(--shadow);
  max-height: 92vh;
  overflow-y: auto;
}

.setup-logo  { font-size: 40px; text-align: center; }
.setup-title { font-size: 20px; font-weight: 700; text-align: center; }
.tc-group    { display: flex; flex-direction: column; gap: 10px; }

.tc-group-header { display: flex; align-items: baseline; gap: 10px; }
.tc-group-name   { font-size: 15px; font-weight: 700; color: var(--text); }
.tc-group-range  { font-size: 12px; color: var(--text-dim); }
.tc-group-desc   { font-size: 12px; color: var(--text-dim); line-height: 1.5; margin-top: -4px; }

.tc-grid { display: flex; gap: 8px; flex-wrap: wrap; }

.tc-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 10px 16px;
  background: var(--surface2);
  border: 2px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
  min-width: 90px;
}
.tc-btn:hover    { border-color: var(--accent); transform: translateY(-1px); }
.tc-btn.selected { border-color: var(--accent); background: rgba(124,106,255,0.15); }
.tc-btn.selected .tc-label { color: var(--accent-h); }

.tc-label { font-size: 16px; font-weight: 800; font-variant-numeric: tabular-nums; }
.tc-sub   { font-size: 10px; color: var(--text-dim); white-space: nowrap; }

.waiting-tc {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-h);
  background: rgba(124,106,255,0.1);
  border: 1px solid rgba(124,106,255,0.3);
  border-radius: 6px;
  padding: 6px 12px;
  text-align: center;
}

/* ─── Resign button ─────────────────────────────────── */
.btn-resign {
  background: transparent;
  color: var(--red);
  border: 1px solid rgba(239,68,68,0.4);
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}
.btn-resign:hover { background: rgba(239,68,68,0.1); border-color: var(--red); opacity: 1; }
.btn-resign.confirming {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
  animation: pulse-red 0.6s ease-in-out infinite;
}
@keyframes pulse-red {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239,68,68,0.4); }
  50%       { box-shadow: 0 0 0 6px rgba(239,68,68,0); }
}

/* ─── Home background decoration ────────────────────── */
.bg-deco {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.deco-piece {
  position: absolute;
  left: var(--x);
  top: var(--y);
  font-size: calc(90px * var(--s, 1));
  opacity: 0.04;
  color: var(--accent-h);
  transform: rotate(var(--r, 0deg));
  animation: piece-drift calc(7s + var(--s, 1) * 3s) ease-in-out var(--d, 0s) infinite alternate;
  filter: blur(0.5px);
  user-select: none;
}

@keyframes piece-drift {
  from { transform: rotate(var(--r, 0deg)) translateY(0px); }
  to   { transform: rotate(var(--r, 0deg)) translateY(-18px); }
}

.home-container { position: relative; z-index: 1; }

/* ─── Home features strip ────────────────────────────── */
.home-features {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.feature {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--text-dim);
}

.feature span { font-size: 13px; }

/* ─── Material tracker ──────────────────────────────── */
.material-bar {
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 32px;
  padding: 0 4px;
}

.material-pieces {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  letter-spacing: -2px;
  line-height: 1;
}

.mat-piece {
  font-size: 26px;
  opacity: 0.85;
}

.material-adv {
  font-size: 12px;
  font-weight: 700;
  color: var(--green);
  background: rgba(34,197,94,0.12);
  border: 1px solid rgba(34,197,94,0.3);
  border-radius: 4px;
  padding: 1px 6px;
  margin-left: 4px;
  letter-spacing: 0;
}

/* ─── Responsive ────────────────────────────────────── */
@media (max-width: 640px) {
  .sidebar { width: 100%; padding-top: 0; }
  .game-layout { gap: 16px; padding: 16px; }
  .move-history { max-height: 200px; }
  .home-container { padding: 36px 24px; }
}