@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
  --bg-primary: #0f1015;      /* Deep dark space */
  --bg-secondary: #161824;    /* Slate dark panel */
  --bg-glass: rgba(22, 24, 36, 0.85);
  --border-glass: rgba(255, 255, 255, 0.08);
  --text-primary: #f1f1f5;
  --text-secondary: #a0a5b5;
  --accent-gold: #4fc3f7;     /* High-tech cyan gold alternative */
  
  --square-light: #E8E0CF;                         /* Warm off-white Light */
  --square-dark: #58759A;                          /* Muted slate blue Dark */
  --square-border: rgba(0, 0, 0, 0.04);
  
  /* Glass Highlights */
  --highlight-select: rgba(6, 182, 212, 0.45);    /* Glass vibrant cyan select */
  --highlight-move: rgba(6, 182, 212, 0.35);      /* Glass valid move dot */
  --highlight-capture: rgba(6, 182, 212, 0.35);   /* Glass capture ring */
  --highlight-check: rgba(239, 68, 68, 0.55);     /* Translucent red check */
  --highlight-last-move: rgba(255, 255, 255, 0.22); /* Frosted last move indicator */
  
  /* Traditional Piece Colors */
  --color-white-fill: #F7F3EA;                     /* Soft Ivory White */
  --color-white-stroke: #2B2B2B;                   /* Clean Dark Outline */
  --color-black-fill: #2B2B2B;                     /* Deep Charcoal Black */
  --color-black-stroke: #151515;                   /* Dark Outline */
  
  /* Multiplayer Color Palettes */
  --color-p1: #ff6b6b; /* Red 1 (Lighter) */
  --color-p2: #c92a2a; /* Red 2 (Darker) */
  --color-p3: #8ce99a; /* Green 1 (Lighter) */
  --color-p4: #2b8a3e; /* Green 2 (Darker) */
  --color-p5: #f59f00; /* Yellow 2 (Darker) */
  --color-p6: #ffec99; /* Yellow 1 (Lighter) */
  --color-p7: #74c0fc; /* Blue 2 (Lighter) */
  --color-p8: #1971c2; /* Blue 1 (Darker) */
  --color-dead: #8e8e93;
}

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

body {
  font-family: 'Outfit', sans-serif;
  background: radial-gradient(circle at center, #141622 0%, #07080b 100%);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
}

header {
  width: 100%;
  max-width: 1400px;
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-glass);
  background: var(--bg-secondary);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.logo span {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-secondary);
  margin-left: 8px;
}

.controls-header {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* Styled Dropdown */
.select-wrapper {
  position: relative;
}
.select-wrapper select {
  appearance: none;
  background: #312e2b;
  border: 1px solid var(--border-glass);
  padding: 8px 36px 8px 14px;
  border-radius: 6px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  outline: none;
}
.select-wrapper select:hover {
  background: #3c3835;
}
.select-wrapper::after {
  content: '▼';
  font-size: 0.6rem;
  color: var(--text-secondary);
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}

/* Button styling */
.btn {
  background: #312e2b;
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
  padding: 8px 16px;
  border-radius: 6px;
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s ease;
}
.btn:hover {
  background: #3c3835;
}
.btn-primary {
  background: #81b64c; /* Chess.com green button */
  border-color: rgba(0,0,0,0.1);
  color: #fff;
  font-weight: 600;
}
.btn-primary:hover {
  background: #95c25d;
}

.main-container {
  width: 100%;
  max-width: 1400px;
  padding: 20px 30px;
  display: grid;
  grid-template-columns: 280px 1fr 360px;
  gap: 30px;
  align-items: start;
}

@media (max-width: 1100px) {
  .main-container {
    grid-template-columns: 1fr;
  }
}

/* Left Section: Board Panel */
.board-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.phase-banner {
  width: 100%;
  padding: 10px 16px;
  border-radius: 6px;
  margin-bottom: 16px;
  text-align: center;
  font-weight: 500;
  font-size: 0.95rem;
  background: rgba(129, 182, 76, 0.1);
  border: 1px solid rgba(129, 182, 76, 0.2);
  color: #95c25d;
}

.board-outer-container {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 580px;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Refined flat board frame */
.chess-board {
  display: grid;
  width: 100%;
  height: 100%;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.55), inset 0 0 0 1px rgba(255, 255, 255, 0.05);
  border: 6px solid #2b3040; /* Sharp, clean dark slate border frame */
  background: #141622;
}

.board-8x8 {
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
}

.board-14x14 {
  grid-template-columns: repeat(14, 1fr);
  grid-template-rows: repeat(14, 1fr);
}

/* Squares */
.square {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background-color 0.1s ease;
  user-select: none;
}

.square:not(.out-of-bounds) {
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 0 0 0.5px rgba(255, 255, 255, 0.05); /* Extremely subtle bevel grid lines */
}

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

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

.square.out-of-bounds {
  background-color: transparent !important;
  border: none !important;
  pointer-events: none;
  box-shadow: none !important;
}

/* Selection Highlight */
.square.selected {
  background-color: var(--highlight-select) !important;
}

/* Valid moves dot (Chess.com style) */
.square.valid-move::before {
  content: '';
  width: 26%;
  height: 26%;
  background-color: var(--highlight-move);
  border-radius: 50%;
  position: absolute;
  pointer-events: none;
  z-index: 10;
}

/* Valid capture ring (Chess.com style) */
.square.valid-capture::before {
  content: '';
  width: 80%;
  height: 80%;
  border: 6px solid var(--highlight-capture);
  border-radius: 50%;
  position: absolute;
  pointer-events: none;
  z-index: 10;
}

.square.checked-king {
  background: var(--highlight-check) !important;
}

.square.last-move {
  background-color: var(--highlight-last-move);
}

.square.placement-zone::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: color-mix(in srgb, var(--zone-color, #ffffff) 10%, transparent); /* Player-colored transparent sheen */
  box-shadow: inset 0 0 0 3px color-mix(in srgb, var(--zone-color, #ffffff) 22%, transparent); /* Player-colored inset border shadow */
  pointer-events: none;
  z-index: 5;
}

/* Premove Styling */
.square.premove-target {
  background-color: rgba(244, 63, 94, 0.35) !important;
}

.square.premove-selected {
  background-color: rgba(244, 63, 94, 0.45) !important;
}

.square.premove-valid {
  position: relative;
}
.square.premove-valid::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(244, 63, 94, 0.4);
  pointer-events: none;
  z-index: 10;
}

.square.premove-valid-capture {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}
.square.premove-valid-capture::after {
  content: "";
  width: 80%;
  height: 80%;
  border: 5px solid rgba(244, 63, 94, 0.4);
  border-radius: 50%;
  position: absolute;
  pointer-events: none;
  z-index: 10;
}

/* Chess pieces */
.piece {
  width: 90%;
  height: 90%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  z-index: 15;
  user-select: none;
  transition: transform 0.12s ease;
}

.piece:hover {
  transform: scale(1.03);
}

.piece:active {
  transform: scale(1.08);
}

.piece svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.35)) drop-shadow(0 0 0.5px rgba(255, 255, 255, 0.15));
}

/* Piece SVG fills and strokes */
/* 2-Player Traditional Chess Colors */
.piece-white svg {
  --piece-fill: var(--color-white-fill);
  --piece-stroke: var(--color-white-stroke);
  --piece-detail: var(--color-white-stroke);
}
.piece-black svg {
  --piece-fill: var(--color-black-fill);
  --piece-stroke: var(--color-black-stroke);
  --piece-detail: #ffffff;
}

/* Multiplayer Colors */
.piece-p1 svg { --piece-fill: var(--color-p1); --piece-stroke: #5c0e0e; --piece-detail: #ffffff; }
.piece-p2 svg { --piece-fill: var(--color-p2); --piece-stroke: #3a0505; --piece-detail: #ffffff; }
.piece-p3 svg { --piece-fill: var(--color-p3); --piece-stroke: #0c3614; --piece-detail: #ffffff; }
.piece-p4 svg { --piece-fill: var(--color-p4); --piece-stroke: #06210b; --piece-detail: #ffffff; }
.piece-p5 svg { --piece-fill: var(--color-p5); --piece-stroke: #523600; --piece-detail: #ffffff; }
.piece-p6 svg { --piece-fill: var(--color-p6); --piece-stroke: #635003; --piece-detail: #ffffff; }
.piece-p7 svg { --piece-fill: var(--color-p7); --piece-stroke: #08325c; --piece-detail: #ffffff; }
.piece-p8 svg { --piece-fill: var(--color-p8); --piece-stroke: #031e3b; --piece-detail: #ffffff; }
.piece-dead svg {
  --piece-fill: var(--color-dead);
  --piece-stroke: #2c2c2e;
  --piece-detail: #5a5a5c;
  opacity: 0.55;
  filter: grayscale(100%);
  cursor: not-allowed;
}

/* Sidebar and Panel layout */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.panel {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.turn-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.turn-header {
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 0.5px;
}

.active-player-display {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
}

.player-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--active-player-color, #fff);
  box-shadow: 0 0 8px var(--active-player-color, #fff);
}

/* Player configuration section */
.settings-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.player-config-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.player-config-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 10px;
  background: #312e2b;
  border-radius: 6px;
  font-size: 0.9rem;
}

.player-config-name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}

.player-config-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--p-color);
}

.player-config-row select {
  background: #262421;
  border: 1px solid var(--border-glass);
  color: var(--text-primary);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
}

/* Piece Tray */
.piece-tray {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px;
  background: #312e2b;
  border-radius: 8px;
  min-height: 70px;
  align-items: center;
}

.tray-item {
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-glass);
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  transition: background 0.15s ease, transform 0.1s ease;
}

.tray-item:hover {
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-1px);
}

.tray-item.selected {
  background: rgba(129, 182, 76, 0.15);
  border-color: #81b64c;
  box-shadow: 0 0 8px rgba(129, 182, 76, 0.3);
}

.tray-item-count {
  position: absolute;
  bottom: -3px;
  right: -3px;
  background: #262421;
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-primary);
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 8px;
}

/* Logs */
/* Tabbed Log / Chat Widget */
.tabs-container {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  min-height: 600px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.tab-headers {
  display: flex;
  background: #1f1d1b;
  border-bottom: 1px solid var(--border-glass);
}

.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: 12px;
  color: var(--text-secondary);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: all 0.15s ease;
  outline: none;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.02);
}

.tab-btn.active {
  color: var(--accent-gold);
  border-bottom: 2px solid var(--accent-gold);
  background: var(--bg-secondary);
}

.tab-content {
  display: none;
  flex-direction: column;
  flex-grow: 1;
  padding: 15px;
  overflow: hidden;
  height: 520px;
}

.tab-content.active {
  display: flex;
}

.log-entries {
  overflow-y: auto;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding-right: 5px;
}

.log-entry {
  padding: 6px 10px;
  border-radius: 4px;
  background: rgba(255,255,255,0.01);
  border-left: 3px solid transparent;
}
.log-entry.system { border-color: var(--accent-gold); color: var(--text-primary); }
.log-entry.p1 { border-color: var(--color-p1); }
.log-entry.p2 { border-color: var(--color-p2); }

/* Interactive Chat Styling */
.chat-messages {
  flex-grow: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-right: 5px;
  margin-bottom: 10px;
}

.chat-msg {
  display: flex;
  flex-direction: column;
  max-width: 85%;
  align-self: flex-start;
}

.chat-msg.self {
  align-self: flex-end;
}

.chat-sender {
  font-size: 0.7rem;
  font-weight: 600;
  margin-bottom: 2px;
  color: var(--sender-color, var(--text-secondary));
  padding-left: 4px;
}

.chat-msg.self .chat-sender {
  padding-left: 0;
  padding-right: 4px;
  align-self: flex-end;
}

.chat-bubble {
  background: #312e2b;
  border: 1px solid var(--border-glass);
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--text-primary);
}

.chat-msg.self .chat-bubble {
  background: #3b3835;
  border-color: rgba(255,255,255,0.1);
}

.chat-input-bar {
  display: flex;
  gap: 8px;
  border-top: 1px solid var(--border-glass);
  padding-top: 10px;
}

.chat-input-bar input {
  flex-grow: 1;
  background: #1f1d1b;
  border: 1px solid var(--border-glass);
  border-radius: 6px;
  padding: 8px 12px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.85rem;
  outline: none;
}

.chat-input-bar input:focus {
  border-color: var(--accent-gold);
}

.chat-input-bar button {
  background: var(--accent-gold);
  color: #161512;
  border: none;
  padding: 8px 14px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.chat-input-bar button:hover {
  opacity: 0.9;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: 12px;
  padding: 24px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.5);
  transform: scale(0.95);
  transition: transform 0.2s ease;
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--accent-gold);
}

.modal-text {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.promotion-options {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.promo-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1/1;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-glass);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
  padding: 8px;
}

.promo-option:hover {
  background: rgba(255,255,255,0.06);
  transform: translateY(-1px);
}

.promo-option svg {
  width: 100%;
  height: 100%;
}

.promo-label {
  font-size: 0.7rem;
  font-weight: 600;
  margin-top: 4px;
  color: var(--text-secondary);
}

/* Instructions */
.instructions-panel {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}
.instructions-panel h3 {
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.instructions-panel p {
  margin-bottom: 8px;
}
.instructions-panel ul {
  padding-left: 15px;
}
.instructions-panel li {
  margin-bottom: 4px;
}