/* ==========================================================================
   Schachspiel – Modernes Design mit dunklem Theme
   ========================================================================== */

:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #1f2b47;
  --bg-hover: #253554;
  --text-primary: #e8e8e8;
  --text-secondary: #a0a8b8;
  --accent: #4fc3f7;
  --accent-hover: #81d4fa;
  --danger: #ef5350;
  --success: #66bb6a;
  --square-light: #e8d5b5;
  --square-dark: #b58863;
  --square-selected: rgba(255, 235, 59, 0.55);
  --square-valid: rgba(102, 187, 106, 0.45);
  --square-capture: rgba(239, 83, 80, 0.5);
  --square-last-move: rgba(255, 235, 59, 0.28);
  --square-check: rgba(239, 83, 80, 0.55);
  --clock-active-border: var(--success);
  --sq-size: clamp(40px, 9vmin, 68px);
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

html {
  font-size: 16px;
}

body {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding: 20px 10px;
  background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
  font-family: var(--font);
  color: var(--text-primary);
}

/* ==========================================================================
   LAYOUT
   ========================================================================== */

#app {
  width: 100%;
  max-width: 900px;
}

#title {
  text-align: center;
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: 1px;
  color: var(--accent);
}

#main-layout {
  display: flex;
  gap: 20px;
  justify-content: center;
  align-items: flex-start;
}

#board-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

/* ==========================================================================
   UHREN
   ========================================================================== */

#clock-display {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
  max-width: calc(var(--sq-size) * 8 + 48px);
}

.player-clock {
  flex: 1;
  font-size: 1.1rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 8px;
  text-align: center;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.white-clock {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.black-clock {
  background-color: rgba(0, 0, 0, 0.3);
  color: var(--text-primary);
}

.active-clock {
  border-color: var(--clock-active-border);
  box-shadow: 0 0 12px rgba(102, 187, 106, 0.3);
}

/* ==========================================================================
   GESCHLAGENE FIGUREN
   ========================================================================== */

.captured-bar {
  min-height: 28px;
  font-size: 1.3rem;
  letter-spacing: 2px;
  color: var(--text-secondary);
  width: 100%;
  max-width: calc(var(--sq-size) * 8 + 48px);
  padding: 2px 4px;
  text-align: center;
  word-break: break-all;
}

/* ==========================================================================
   BRETT MIT BESCHRIFTUNG
   ========================================================================== */

#board-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.col-labels {
  display: grid;
  grid-template-columns: repeat(8, var(--sq-size));
  margin-left: 24px;
  margin-right: 24px;
}

.col-labels span {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  line-height: 1.6;
  user-select: none;
}

#board-with-rows {
  display: flex;
  align-items: stretch;
}

.row-labels {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 24px;
}

.row-labels span {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  height: var(--sq-size);
  user-select: none;
}

/* ==========================================================================
   SPIELFELD (8x8 Grid)
   ========================================================================== */

#gameboard {
  display: grid;
  grid-template-columns: repeat(8, var(--sq-size));
  grid-template-rows: repeat(8, var(--sq-size));
  border: 3px solid #3a3a5c;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.square {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--sq-size);
  height: var(--sq-size);
  font-size: calc(var(--sq-size) * 0.6);
  cursor: pointer;
  user-select: none;
  transition: background-color 0.15s ease;
  position: relative;
}

.square:hover {
  filter: brightness(1.1);
}

/* Tastatur-Fokus-Ring */
.square:focus {
  outline: 3px solid var(--accent);
  outline-offset: -3px;
  z-index: 1;
}

.square:focus:not(:focus-visible) {
  outline: none;
}

.square:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: -3px;
  z-index: 1;
}

/* Feldfarben */
.light {
  background-color: var(--square-light);
}

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

/* Figurenfarben – Weiss und Schwarz, unabhängig vom Feld */
.square.piece-white {
  color: #f5f5f5;
  -webkit-text-stroke: 0.5px rgba(0, 0, 0, 0.5);
  text-shadow:
    0 0 2px rgba(0, 0, 0, 0.6),
    0 1px 3px rgba(0, 0, 0, 0.4),
    0 2px 4px rgba(0, 0, 0, 0.2);
}

.square.piece-black {
  color: #2d2d2d;
  -webkit-text-stroke: 0.5px rgba(255, 255, 255, 0.4);
  text-shadow:
    0 0 2px rgba(255, 255, 255, 0.4),
    0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Ausgewaehltes Feld */
.square.selected {
  background-color: var(--square-selected) !important;
  box-shadow: inset 0 0 0 3px rgba(255, 235, 59, 0.7);
}

/* Gueltiger Zug (leeres Feld) - kleiner Punkt */
.square.valid-move::after {
  content: "";
  position: absolute;
  width: 26%;
  height: 26%;
  border-radius: 50%;
  background-color: rgba(0, 0, 0, 0.25);
  pointer-events: none;
}

/* Gueltiger Schlagzug - Ring um das Feld */
.square.valid-capture {
  background-color: var(--square-capture) !important;
  box-shadow: inset 0 0 0 3px rgba(239, 83, 80, 0.6);
}

/* Letzter Zug */
.square.last-move {
  background-color: var(--square-last-move) !important;
}

/* Feld mit Koenig im Schach */
.square.check {
  background-color: var(--square-check) !important;
  animation: checkPulse 1s ease-in-out infinite;
}

@keyframes checkPulse {
  0%,
  100% {
    box-shadow: inset 0 0 8px rgba(239, 83, 80, 0.4);
  }
  50% {
    box-shadow: inset 0 0 18px rgba(239, 83, 80, 0.8);
  }
}

/* Figur-Platzierung Animation */
@keyframes piecePlace {
  0% {
    transform: scale(1.25);
    opacity: 0.6;
  }
  60% {
    transform: scale(0.95);
    opacity: 1;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.square.piece-placed {
  animation: piecePlace 0.25s ease-out;
}

/* ==========================================================================
   SPIELINFO & BUTTONS
   ========================================================================== */

#game-info {
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

#game-info p {
  margin: 3px 0;
}

#player {
  font-weight: 700;
  color: var(--text-primary);
}

#info-display {
  transition: color 0.3s;
}

#info-display.check-warning {
  color: var(--danger);
  font-weight: 600;
}

#button-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
  justify-content: center;
}

#button-bar button {
  padding: 8px 18px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

#btn-new-game {
  background-color: var(--accent);
  color: #1a1a2e;
}

#btn-new-game:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 195, 247, 0.3);
}

#btn-undo {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

#btn-undo:hover {
  background-color: rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
}

#btn-flip,
#btn-mute,
#btn-pgn,
#btn-resign {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

#btn-flip:hover,
#btn-mute:hover,
#btn-pgn:hover,
#btn-resign:hover {
  background-color: rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
}

#btn-mute.muted {
  opacity: 0.7;
}

.modal-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 16px;
}

.modal-buttons button {
  padding: 10px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font);
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

#btn-resign-confirm {
  background-color: var(--danger);
  color: white;
}

#btn-resign-cancel {
  background-color: rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
}

.square.dragging {
  opacity: 0.5;
}

.moving-piece {
  position: fixed;
  z-index: 1000;
  pointer-events: none;
  font-size: calc(var(--sq-size) * 0.6);
  transition: transform 0.2s ease-out;
}

.captured-bar .material-adv {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--success);
  margin-left: 6px;
}

/* ==========================================================================
   SEITENLEISTE (Zughistorie)
   ========================================================================== */

#sidebar {
  background-color: var(--bg-card);
  border-radius: 10px;
  padding: 16px;
  min-width: 180px;
  max-width: 220px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

#sidebar h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--accent);
  text-align: center;
}

#move-list {
  max-height: calc(var(--sq-size) * 8);
  overflow-y: auto;
  font-size: 0.85rem;
  font-family: "Courier New", monospace;
}

#move-list::-webkit-scrollbar {
  width: 5px;
}

#move-list::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}

.move-row {
  display: grid;
  grid-template-columns: 30px 1fr 1fr;
  gap: 4px;
  padding: 3px 4px;
  border-radius: 4px;
  transition: background-color 0.15s;
}

.move-row:hover {
  background-color: var(--bg-hover);
}

.move-num {
  color: var(--text-secondary);
  text-align: right;
  padding-right: 4px;
}

.move-white,
.move-black {
  color: var(--text-primary);
}

/* ==========================================================================
   MODALS
   ========================================================================== */

.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal-overlay.visible {
  display: flex;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 28px 36px;
  text-align: center;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
  animation: modalIn 0.3s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-content h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.modal-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

#promo-options {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.promo-piece {
  font-size: 2.8rem;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  border: 2px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.promo-piece:hover {
  background: rgba(79, 195, 247, 0.2);
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(79, 195, 247, 0.2);
}

#btn-play-again {
  margin-top: 16px;
  padding: 10px 28px;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font);
  background-color: var(--accent);
  color: #1a1a2e;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

#btn-play-again:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 195, 247, 0.3);
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

@media (max-width: 700px) {
  #main-layout {
    flex-direction: column;
    align-items: center;
  }

  #sidebar {
    min-width: unset;
    max-width: 100%;
    width: calc(var(--sq-size) * 8 + 48px);
  }

  #move-list {
    max-height: 120px;
  }

  #title {
    font-size: 1.4rem;
  }

  .player-clock {
    font-size: 0.95rem;
    padding: 6px 8px;
  }

  .promo-piece {
    font-size: 2.2rem;
    width: 52px;
    height: 52px;
  }
}

@media (max-width: 400px) {
  :root {
    --sq-size: 38px;
  }

  .row-labels {
    width: 18px;
  }

  .col-labels {
    margin-left: 18px;
    margin-right: 18px;
  }

  .col-labels span,
  .row-labels span {
    font-size: 0.65rem;
  }

  #button-bar {
    flex-direction: column;
  }

  #button-bar button {
    width: 100%;
  }
}