/* ============================================================
   SQL Chess — Global Styles
   Dark theme, responsive layout
   ============================================================ */

/* ── Custom Properties ─────────────────────────────────────── */
:root {
  --bg-base:      #0d1117;
  --bg-surface:   #161b22;
  --bg-elevated:  #21262d;
  --bg-border:    #30363d;

  --chess-panel-padding: 4rem; /* total horizontal padding within chess panel (2 × 1rem + margins) */

  /* Board size: fills the 70 % chess panel minus padding, capped at 720 px.
     Also constrained by viewport height (subtracting ~280px for header 56px +
     player bars ~80px + controls ~40px + move history ~100px + gaps ~4px). */
  --board-sz: clamp(300px, min(calc(70vw - var(--chess-panel-padding) * 2), calc(100vh - 280px)), 720px);

  --text-primary:   #e6edf3;
  --text-secondary: #8b949e;
  --text-muted:     #484f58;

  --accent-blue:    #58a6ff;
  --accent-green:   #3fb950;
  --accent-orange:  #d29922;
  --accent-red:     #f85149;
  --accent-purple:  #bc8cff;

  --board-light:    #f0d9b5;
  --board-dark:     #b58863;
  --board-select:   #7fc97f;
  --board-move:     rgba(127, 201, 127, 0.45);
  --board-check:    rgba(248, 81, 73, 0.75);
  --board-last-from: rgba(155, 199, 232, 0.4);
  --board-last-to:   rgba(155, 199, 232, 0.55);

  --sql-bg:       #0d1117;
  --sql-keyword:  #ff7b72;
  --sql-string:   #a5d6ff;
  --sql-comment:  #8b949e;
  --sql-number:   #79c0ff;
  --sql-function: #d2a8ff;

  --radius:    6px;
  --radius-lg: 12px;

  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Courier New', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

  --shadow-sm:  0 1px 4px rgba(0,0,0,.4);
  --shadow-md:  0 4px 16px rgba(0,0,0,.5);
  --shadow-lg:  0 8px 32px rgba(0,0,0,.6);
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.5;
  overflow: hidden;
}

button { cursor: pointer; font-family: inherit; }
input  { font-family: inherit; }
a      { color: var(--accent-blue); }

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

/* ── Header ────────────────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 56px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--bg-border);
  position: sticky;
  top: 0;
  z-index: 100;
  flex-shrink: 0;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: 1.2rem;
  font-weight: 700;
  user-select: none;
}
.logo-icon   { font-size: 1.5rem; }
.logo-accent { color: var(--accent-blue); }

.header-controls {
  display: flex;
  align-items: center;
  gap: .5rem;
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  padding: .4rem .85rem;
  border-radius: var(--radius);
  border: 1px solid var(--bg-border);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-size: .875rem;
  font-weight: 500;
  transition: background .15s, border-color .15s, color .15s, box-shadow .15s;
  white-space: nowrap;
}
.btn:hover { background: #2d333b; border-color: #8b949e; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent-blue);
  border-color: var(--accent-blue);
  color: #0d1117;
}
.btn-primary:hover { background: #79bcff; border-color: #79bcff; }

.btn-secondary {
  background: var(--bg-elevated);
  border-color: var(--accent-purple);
  color: var(--accent-purple);
}
.btn-secondary:hover { background: #2d2152; }

.btn-outline {
  background: transparent;
  border-color: var(--bg-border);
  color: var(--text-secondary);
}
.btn-outline:hover { background: var(--bg-elevated); color: var(--text-primary); }

.btn-sm  { padding: .3rem .65rem; font-size: .8rem; }
.btn-xs  { padding: .2rem .5rem;  font-size: .75rem; }
.btn-wide { width: 100%; justify-content: center; }

/* ── Main Layout ────────────────────────────────────────────── */
.app-main {
  display: flex;
  flex: 1;
  gap: 0;
  overflow: hidden;
}

/* ── Chess Panel ────────────────────────────────────────────── */
.chess-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem;
  gap: .6rem;
  flex: 0 0 70%;
  width: 70%;
  min-width: 0;
  overflow-y: auto;
  scrollbar-width: thin;
}

/* When SQL panel is hidden, chess panel fills the available space */
/* .sql-hidden is set by JS as a fallback for browsers without :has() support */
.chess-panel.sql-hidden,
.chess-panel:has(~ .sql-panel.hidden-panel) {
  flex: 1;
  width: 100%;
}

/* Player bars */
.player-bar {
  display: flex;
  align-items: center;
  gap: .6rem;
  width: 100%;
  max-width: var(--board-sz);
  padding: .4rem .6rem;
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius);
}

.player-avatar {
  font-size: 1.4rem;
  width: 2rem;
  text-align: center;
  flex-shrink: 0;
}
.white-avatar { filter: drop-shadow(0 0 3px rgba(255,255,255,.4)); }
.black-avatar { filter: drop-shadow(0 0 3px rgba(0,0,0,.6)); }

.player-details {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}
.player-name {
  font-weight: 600;
  font-size: .9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.player-badge {
  font-size: .75rem;
  color: var(--accent-green);
  font-weight: 500;
}

.captured-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  font-size: .95rem;
  min-height: 1.2rem;
  flex: 1;
  justify-content: flex-end;
}

/* ── Board ──────────────────────────────────────────────────── */
.board-wrapper {
  position: relative;
  display: grid;
  grid-template-columns: 1.2rem auto;
  grid-template-rows: auto 1.2rem;
  gap: 2px;
}

.rank-labels {
  grid-column: 1;
  grid-row: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
}
.rank-label {
  font-size: .7rem;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1;
}

.file-labels {
  grid-column: 2;
  grid-row: 2;
  display: flex;
  justify-content: space-around;
}
.file-label {
  font-size: .7rem;
  color: var(--text-secondary);
  text-align: center;
  flex: 1;
  line-height: 1;
}

.board-grid {
  grid-column: 2;
  grid-row: 1;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  border: 2px solid #555;
  border-radius: 3px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  width: var(--board-sz);
  height: var(--board-sz);
}

/* Individual squares */
.sq {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
  user-select: none;
  transition: background .1s;
}
.sq.light { background: var(--board-light); }
.sq.dark  { background: var(--board-dark);  }

.sq:hover { filter: brightness(1.12); }

/* Highlights */
.sq.selected        { background: var(--board-select) !important; }
.sq.valid-move::after {
  content: '';
  position: absolute;
  width: 32%;
  height: 32%;
  border-radius: 50%;
  background: rgba(0,0,0,.2);
  pointer-events: none;
}
.sq.valid-capture::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 4px solid rgba(0,0,0,.2);
  pointer-events: none;
  width: auto;
  height: auto;
}
.sq.last-from { background: var(--board-last-from) !important; }
.sq.last-to   { background: var(--board-last-to)   !important; }
.sq.in-check  { background: var(--board-check)     !important; }

/* Pieces */
.piece {
  font-size: calc(var(--board-sz) / 10);
  line-height: 1;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  text-shadow: 1px 1px 2px rgba(0,0,0,.5);
  transition: transform .1s;
  position: relative;
  z-index: 1;
}
.sq:hover .piece { transform: scale(1.05); }

/* ── Game Controls ──────────────────────────────────────────── */
.game-controls {
  display: flex;
  align-items: center;
  gap: .5rem;
  width: 100%;
  max-width: var(--board-sz);
}

.game-status-text {
  margin-left: auto;
  font-size: .85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ── Move History ───────────────────────────────────────────── */
.move-history-box {
  width: 100%;
  max-width: var(--board-sz);
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius);
  overflow: hidden;
  flex-shrink: 0;
}
.move-history-header {
  padding: .4rem .8rem;
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--bg-border);
  background: var(--bg-elevated);
}
.moves-list {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem;
  padding: .5rem .6rem;
  min-height: 2.5rem;
  max-height: 160px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: .8rem;
  scrollbar-width: thin;
}
.move-pair {
  display: flex;
  align-items: center;
  gap: .2rem;
  color: var(--text-secondary);
}
.move-num { color: var(--text-muted); margin-right: .1rem; }
.move-san {
  color: var(--text-primary);
  padding: .1rem .3rem;
  border-radius: 3px;
  cursor: pointer;
  transition: background .1s;
}
.move-san:hover { background: var(--bg-elevated); }
.move-san.active { background: var(--accent-blue); color: #0d1117; }

/* ── SQL Panel ──────────────────────────────────────────────── */
.sql-panel {
  flex: 0 0 30%;
  width: 30%;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--bg-border);
  background: var(--sql-bg);
  overflow: hidden;
  min-width: 0;
  transition: width .25s ease, flex .25s ease, opacity .2s;
}
.sql-panel.hidden-panel {
  flex: 0 0 0;
  width: 0;
  opacity: 0;
  pointer-events: none;
  border-left: none;
}

.sql-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .6rem 1rem;
  border-bottom: 1px solid var(--bg-border);
  background: var(--bg-surface);
  flex-shrink: 0;
}
.sql-title {
  font-size: .95rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: .4rem;
  color: var(--accent-blue);
}
.sql-icon { font-size: .9rem; }
.sql-actions {
  display: flex;
  align-items: center;
  gap: .5rem;
}
.autoscroll-label {
  display: flex;
  align-items: center;
  gap: .3rem;
  font-size: .75rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

/* SQL content area */
.sql-content {
  flex: 1;
  overflow-y: auto;
  padding: .75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  scroll-behavior: smooth;
  scrollbar-width: thin;
}

.sql-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .75rem;
  flex: 1;
  color: var(--text-muted);
  text-align: center;
  padding: 2rem;
}
.placeholder-icon { font-size: 2.5rem; opacity: .3; }
.sql-placeholder p { font-size: .9rem; }
.placeholder-hint { font-size: .8rem; line-height: 1.6; color: var(--text-muted); opacity: .7; }

/* SQL blocks */
.sql-block {
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius);
  overflow: hidden;
  animation: fadeSlideIn .2s ease;
}
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.sql-block-label {
  display: flex;
  align-items: center;
  gap: .4rem;
  padding: .35rem .75rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--bg-border);
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-secondary);
}
.sql-block-badge {
  background: var(--accent-blue);
  color: #0d1117;
  padding: .05rem .35rem;
  border-radius: 99px;
  font-size: .65rem;
}

.sql-code {
  padding: .75rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  line-height: 1.65;
  white-space: pre;
  overflow-x: auto;
  color: var(--text-primary);
}
/* SQL syntax colouring */
.sql-kw     { color: var(--sql-keyword);  font-weight: 700; }
.sql-str    { color: var(--sql-string); }
.sql-cmt    { color: var(--sql-comment);  font-style: italic; }
.sql-num    { color: var(--sql-number); }
.sql-fn     { color: var(--sql-function); }

/* ── Modals ─────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
  padding: 1rem;
}
.modal-overlay.hidden { display: none; }

.modal {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
  animation: modalIn .2s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(.96) translateY(10px); }
  to   { opacity: 1; transform: scale(1)   translateY(0); }
}
.modal-sm { max-width: 320px; }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem .75rem;
  border-bottom: 1px solid var(--bg-border);
}
.modal-header h2 { font-size: 1rem; font-weight: 700; }

.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1;
  padding: .2rem .4rem;
  border-radius: var(--radius);
  transition: background .15s, color .15s;
}
.modal-close-btn:hover { background: var(--bg-elevated); color: var(--text-primary); }

.modal-body {
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .85rem;
}
.modal-footer {
  display: flex;
  gap: .6rem;
  padding: .75rem 1.25rem 1rem;
  flex-direction: column;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: .3rem;
}
.form-row label {
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.form-row input[type="text"] {
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius);
  color: var(--text-primary);
  padding: .5rem .7rem;
  font-size: .9rem;
  outline: none;
  transition: border-color .15s;
}
.form-row input[type="text"]:focus { border-color: var(--accent-blue); }

.toggle-row {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

/* Toggle switch */
.switch { position: relative; display: inline-block; width: 40px; height: 22px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute;
  inset: 0;
  background: var(--bg-border);
  border-radius: 99px;
  transition: background .2s;
  cursor: pointer;
}
.slider::before {
  content: '';
  position: absolute;
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background: white;
  border-radius: 50%;
  transition: transform .2s;
}
input:checked + .slider { background: var(--accent-blue); }
input:checked + .slider::before { transform: translateX(18px); }

/* Invite modal */
.invite-info  { font-size: .875rem; color: var(--text-secondary); }
.invite-url-row {
  display: flex;
  gap: .5rem;
}
.invite-url-row input[type="text"] {
  flex: 1;
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius);
  color: var(--text-primary);
  padding: .45rem .65rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  outline: none;
  cursor: text;
  min-width: 0;
}
.invite-meta {
  display: flex;
  gap: 1rem;
  font-size: .82rem;
  color: var(--text-secondary);
}
.invite-meta strong { color: var(--text-primary); }

.copy-feedback {
  color: var(--accent-green);
  font-size: .82rem;
  font-weight: 600;
}

/* Promotion */
.promotion-choices {
  display: flex;
  justify-content: center;
  gap: .5rem;
  padding: .5rem 0;
}
.promotion-btn {
  width: 64px;
  height: 64px;
  font-size: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 2px solid var(--bg-border);
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text-primary);
  transition: border-color .15s, background .15s;
}
.promotion-btn:hover { border-color: var(--accent-blue); background: #1c2431; }

/* ── Toast ──────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  color: var(--text-primary);
  padding: .6rem 1.25rem;
  border-radius: 99px;
  font-size: .875rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  z-index: 9999;
  white-space: nowrap;
  animation: toastIn .2s ease;
}
.toast.hidden { display: none; }
@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ── Scrollbar ──────────────────────────────────────────────── */
::-webkit-scrollbar       { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #555; }

/* ── Utility ────────────────────────────────────────────────── */
.hidden { display: none !important; }

/* ── SQL Input Section ──────────────────────────────────────── */
.sql-input-section {
  flex-shrink: 0;
  border-bottom: 1px solid var(--bg-border);
  background: var(--bg-surface);
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sql-input-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .6rem 1rem;
  border-bottom: 1px solid var(--bg-border);
  min-height: 44px;
}

.sql-input-title {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--accent-green);
}

.sql-input-hint {
  font-size: .7rem;
  color: var(--text-muted);
}

.sql-move-input {
  width: 100%;
  background: var(--bg-base);
  border: none;
  border-bottom: 1px solid var(--bg-border);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: .78rem;
  line-height: 1.6;
  padding: .6rem .75rem;
  resize: none;
  outline: none;
  transition: background .15s;
}
.sql-move-input:focus {
  background: var(--bg-base);
}
.sql-move-input::placeholder { color: var(--text-muted); }

.sql-input-actions {
  display: flex;
  align-items: center;
  gap: .4rem;
  padding: .4rem .6rem;
  justify-content: flex-end;
}

.sql-run-error {
  flex: 1;
  font-size: .75rem;
  color: var(--accent-red);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Copy button on SQL blocks ──────────────────────────────── */
.sql-block-label { position: relative; }

.sql-copy-btn {
  position: absolute;
  right: .5rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-size: .65rem;
  padding: .1rem .35rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
  font-family: var(--font-sans);
}
.sql-copy-btn:hover {
  color: var(--text-secondary);
  border-color: var(--bg-border);
  background: var(--bg-elevated);
}

/* ── Active-turn glow on player bar ─────────────────────────── */
.player-bar.active-turn {
  border-color: var(--accent-green);
  box-shadow: 0 0 0 1px var(--accent-green), inset 0 0 8px rgba(63,185,80,.07);
  transition: border-color .3s, box-shadow .3s;
}

/* ── Responsive additions ───────────────────────────────────── */
@media (max-width: 900px) {
  .sql-input-section { display: flex; }
}

@media (max-width: 900px) {
  .app-main { flex-direction: column; overflow-y: auto; overflow-x: hidden; }

  .chess-panel {
    flex: none;
    width: 100%;
    min-height: auto;
    overflow-y: visible;
  }

  .sql-panel {
    flex: none;
    width: 100%;
    border-left: none;
    border-top: 1px solid var(--bg-border);
    height: 45vh;
    min-height: 260px;
  }
  .sql-panel.hidden-panel {
    height: 0;
    min-height: 0;
    border-top: none;
  }

  /* Mobile: limit by both viewport width and height to handle short screens */
  :root { --board-sz: min(90vw, 440px, calc(55vh)); }
}

@media (max-width: 480px) {
  .app-header { padding: 0 .75rem; }
  .header-logo .logo-text { display: none; }
  .chess-panel { padding: .5rem; }
  .header-controls { gap: .3rem; }

  :root { --board-sz: min(92vw, 360px); }

  #btnToggleSQL #sqlToggleLabel { display: none; }
}