/* =========================================================================
   PARADI // CHESS.AI  —  styles.css
   Retro-futuristic developer console skin for a client-side chess engine.
   ========================================================================= */

/* -------------------------------------------------------------------------
   Theme tokens
   ------------------------------------------------------------------------- */

:root,
[data-theme="amber"] {
  --bg: #141414;
  --panel-bg: #1c1a17;
  --panel-bg-raised: #221f1b;
  --dark-sq: #d35400;
  --light-sq: #f39c12;
  --accent: #ff6b00;
  --accent-soft: rgba(255, 107, 0, 0.35);
  --text: #f5e6d8;
  --text-dim: #c9b8a8;
  --border: rgba(255, 107, 0, 0.28);
  --danger: #e74c3c;
  --piece-white: #fff6e9;
  --piece-black: #241505;
  --log-user: #ffb066;
  --log-ai: #ff6b00;
  --log-system: #9c8f81;
}

[data-theme="midnight"] {
  --bg: #050505;
  --panel-bg: #071009;
  --panel-bg-raised: #0b160e;
  --dark-sq: #00220f;
  --light-sq: #00441b;
  --accent: #39ff88;
  --accent-soft: rgba(57, 255, 136, 0.35);
  --text: #cfffe0;
  --text-dim: #7fcb9e;
  --border: rgba(57, 255, 136, 0.25);
  --danger: #ff4466;
  --piece-white: #eafff3;
  --piece-black: #00160c;
  --log-user: #7fffb0;
  --log-ai: #39ff88;
  --log-system: #4d9c73;
}

[data-theme="classic"] {
  --bg: #201810;
  --panel-bg: #241b12;
  --panel-bg-raised: #2b2116;
  --dark-sq: #2e5a44;
  --light-sq: #ecdfcd;
  --accent: #c9a227;
  --accent-soft: rgba(201, 162, 39, 0.35);
  --text: #f3ead9;
  --text-dim: #c9b79a;
  --border: rgba(201, 162, 39, 0.28);
  --danger: #b33a3a;
  --piece-white: #fffdf6;
  --piece-black: #2a1d10;
  --log-user: #e2c25e;
  --log-ai: #7fae8e;
  --log-system: #a99a7b;
}

[data-theme="slate"] {
  --bg: #1c1e21;
  --panel-bg: #202226;
  --panel-bg-raised: #26282c;
  --dark-sq: #3b3f45;
  --light-sq: #d7dade;
  --accent: #6c9bd1;
  --accent-soft: rgba(108, 155, 209, 0.35);
  --text: #e8e9eb;
  --text-dim: #a7acb3;
  --border: rgba(108, 155, 209, 0.28);
  --danger: #d16c6c;
  --piece-white: #ffffff;
  --piece-black: #101214;
  --log-user: #9dc3ec;
  --log-ai: #6c9bd1;
  --log-system: #7d838b;
}

/* -------------------------------------------------------------------------
   Reset & base
   ------------------------------------------------------------------------- */

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 14px;
  line-height: 1.5;
  transition: background 0.3s ease, color 0.3s ease;
  min-height: 100vh;
}

button, select {
  font-family: inherit;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* -------------------------------------------------------------------------
   Header
   ------------------------------------------------------------------------- */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 28px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.logo-area {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.logo-main {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text);
}

.logo-sep {
  color: var(--accent);
  font-weight: 700;
}

.logo-sub {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.version-tag {
  font-size: 11px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2px 7px;
  margin-left: 4px;
}

.theme-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-control label {
  color: var(--text-dim);
  font-size: 12px;
}

.theme-control select {
  background: var(--panel-bg-raised);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
}

/* -------------------------------------------------------------------------
   Layout
   ------------------------------------------------------------------------- */

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 28px;
  padding: 28px;
  align-items: start;
  max-width: 1280px;
  margin: 0 auto;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 18px;
    gap: 20px;
  }
}

.board-column {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.game-status {
  font-size: 13px;
  color: var(--text-dim);
  border-left: 3px solid var(--accent);
  padding: 8px 12px;
  background: var(--panel-bg);
}

/* -------------------------------------------------------------------------
   Board
   ------------------------------------------------------------------------- */

.board-frame {
  width: min(640px, 100%);
  margin: 0 auto;
}

.board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 2px solid var(--border);
  box-shadow: 0 0 0 1px var(--bg), 0 8px 30px rgba(0, 0, 0, 0.4);
}

.square {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(20px, 6vw, 42px);
  cursor: default;
  position: relative;
  user-select: none;
}

.square.light { background: var(--light-sq); }
.square.dark { background: var(--dark-sq); }

.square.white-piece {
  color: var(--piece-white);
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.6));
  cursor: pointer;
}

.square.black-piece {
  color: var(--piece-black);
  filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.3));
}

.square.selected {
  box-shadow: inset 0 0 0 3px var(--accent);
}

.square.legal-target::after {
  content: "";
  position: absolute;
  width: 24%;
  height: 24%;
  border-radius: 50%;
  background: var(--accent-soft);
}

.square.capture-target {
  box-shadow: inset 0 0 0 3px var(--accent-soft);
}

.square.capture-target::after {
  display: none;
}

.square.king-in-check {
  box-shadow: inset 0 0 0 3px var(--danger);
  background-image: radial-gradient(circle, rgba(231, 76, 60, 0.35), transparent 70%);
}

/* -------------------------------------------------------------------------
   Captured pieces
   ------------------------------------------------------------------------- */

.captured-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.captured-group {
  flex: 1 1 200px;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 12px;
}

.captured-label {
  display: block;
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.captured-pieces {
  font-size: 18px;
  min-height: 22px;
  color: var(--text-dim);
}

/* -------------------------------------------------------------------------
   Side panel
   ------------------------------------------------------------------------- */

.side-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
}

.panel-block {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 14px 16px;
}

.panel-title {
  margin: 0 0 10px 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--accent);
  font-weight: 700;
}

.metrics-list {
  margin: 0;
}

.metric-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 12px;
}

.metric-row:last-child { border-bottom: none; }

.metric-row dt {
  color: var(--text-dim);
}

.metric-row dd {
  margin: 0;
  color: var(--text);
  font-weight: 700;
  text-align: right;
}

.terminal-log {
  background: var(--panel-bg-raised);
  border: 1px solid var(--border);
  border-radius: 3px;
  height: 260px;
  overflow-y: auto;
  padding: 10px 12px;
  font-size: 11px;
  line-height: 1.6;
}

.log-entry {
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 2px;
}

.log-entry.log-system { color: var(--log-system); }
.log-entry.log-user { color: var(--log-user); }
.log-entry.log-ai { color: var(--log-ai); }

.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn {
  border: 1px solid var(--border);
  background: var(--panel-bg-raised);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 4px;
  font-size: 12px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  border-color: var(--accent);
}

.btn-secondary:hover {
  background: var(--accent-soft);
}

.btn-danger {
  color: var(--danger);
  border-color: var(--danger);
}

.btn-danger:hover {
  background: rgba(231, 76, 60, 0.12);
}

/* -------------------------------------------------------------------------
   Promotion modal
   ------------------------------------------------------------------------- */

.promotion-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.promotion-modal.hidden {
  display: none;
}

.promotion-box {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 20px 24px;
  text-align: center;
}

.promotion-box p {
  margin: 0 0 14px 0;
  color: var(--text-dim);
  font-size: 13px;
}

.promotion-choices {
  display: flex;
  gap: 10px;
}

.promo-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: var(--panel-bg-raised);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  padding: 10px 14px;
  font-size: 26px;
  cursor: pointer;
}

.promo-btn span {
  font-size: 10px;
  color: var(--text-dim);
}

.promo-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}