/* =============================================
   MYTHICA CHESS — style.css  (RESPONSIVE FULL)
   Breakpoints: 360 · 480 · 600 · 768 · 900 · 1200 · 1440
   ============================================= */

/* ---- CSS CUSTOM PROPERTIES ---- */
:root {
  --ocean-deep:    #0A1628;
  --ocean-mid:     #0D2240;
  --ocean-surface: #0F3460;
  --glow-teal:     #00D4FF;
  --glow-teal-dim: rgba(0,212,255,0.3);
  --gold-coral:    #FFB347;
  --gold-dim:      rgba(255,179,71,0.4);
  --foam-white:    #E8F4FF;
  --abyss-dark:    #060E1A;
  --piece-white:   #E8F4FF;

  --sq-light:      rgba(100,180,220,0.18);
  --sq-dark:       rgba(5,20,45,0.6);
  --sq-selected:   rgba(0,212,255,0.4);
  --sq-check:      rgba(220,50,50,0.5);

  --font-display:  'Cinzel', serif;
  --font-body:     'Raleway', sans-serif;

  --shadow-glow:   0 0 20px rgba(0,212,255,0.4);
  --shadow-gold:   0 0 15px rgba(255,179,71,0.5);

  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 20px;

  /* Dynamic square size — overridden via JS or media queries */
  --sq: clamp(36px, calc((min(100vw, 100vh) - 160px) / 8), 84px);
  --piece-fs: calc(var(--sq) * 0.62);

  --hud-h: 64px;
  --side-w: 260px;
}

/* ====================================================
   RESET & BASE
   ==================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  width: 100%; height: 100%; min-height: 100dvh;
  background: var(--abyss-dark);
  color: var(--foam-white);
  font-family: var(--font-body);
  overflow: hidden;
  touch-action: manipulation;
}

/* ====================================================
   SCREENS
   ==================================================== */
.screen {
  position: fixed; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: flex-start;
  opacity: 0; pointer-events: none;
  transition: opacity 0.4s ease;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  padding: 0;
}
.screen.active { opacity: 1; pointer-events: all; }

/* ====================================================
   OCEAN BACKGROUND
   ==================================================== */
.ocean-bg {
  position: fixed; inset: 0; z-index: 0;
  background: radial-gradient(ellipse at 50% 100%, #0F3460 0%, #0A1628 40%, #060E1A 100%);
  overflow: hidden;
}
.ocean-bg.dim { opacity: 0.7; }

.wave {
  position: absolute; bottom: 0;
  width: 200%; height: 180px;
  border-radius: 50% 50% 0 0;
  opacity: 0.07;
}
.wave1 { background: var(--glow-teal); animation: waveMove 8s linear infinite; left: -50%; }
.wave2 { background: #4a90d9; animation: waveMove 12s linear infinite reverse; left: -30%; bottom: -30px; }
@keyframes waveMove { 0%{transform:translateX(0)} 100%{transform:translateX(25%)} }

.bubbles {
  position: absolute; inset: 0;
  background-image:
    radial-gradient(circle, rgba(0,212,255,0.14) 1px, transparent 1px),
    radial-gradient(circle, rgba(0,212,255,0.07) 2px, transparent 2px);
  background-size: 120px 120px, 200px 200px;
  animation: bubbleDrift 20s linear infinite;
}
@keyframes bubbleDrift { 0%{transform:translateY(0)} 100%{transform:translateY(-30px)} }

/* ====================================================
   SPLASH
   ==================================================== */
#splash {
  justify-content: center;
  padding: 24px 16px;
}
.splash-content {
  position: relative; z-index: 2;
  display: flex; flex-direction: column;
  align-items: center;
  gap: clamp(24px, 5vh, 52px);
  width: 100%; max-width: 420px;
}

.logo-wrap {
  text-align: center;
  display: flex; flex-direction: column; align-items: center;
  gap: 10px;
}
.trident-icon {
  width: clamp(42px, 8vw, 64px);
  height: auto;
  filter: drop-shadow(0 0 12px var(--glow-teal));
  animation: tridentPulse 3s ease-in-out infinite;
}
@keyframes tridentPulse {
  0%,100%{filter:drop-shadow(0 0 8px var(--glow-teal))}
  50%{filter:drop-shadow(0 0 22px var(--glow-teal)) brightness(1.2)}
}

.game-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 10vw, 5.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0.12em;
  color: var(--foam-white);
  text-shadow: 0 0 28px var(--glow-teal), 0 0 56px rgba(0,212,255,0.25);
}
.game-title span {
  color: var(--gold-coral);
  font-size: 0.62em;
  letter-spacing: 0.32em;
  display: block;
  text-shadow: 0 0 22px var(--gold-coral);
}
.game-subtitle {
  font-weight: 300;
  font-size: clamp(0.7rem, 2.5vw, 1rem);
  letter-spacing: 0.22em;
  color: var(--glow-teal);
  opacity: 0.8;
  text-transform: uppercase;
}

.main-menu {
  display: flex; flex-direction: column;
  gap: 14px; width: 100%;
}
.btn-menu {
  font-family: var(--font-display);
  font-size: clamp(0.9rem, 3vw, 1.1rem);
  letter-spacing: 0.08em;
  padding: clamp(12px, 2vh, 18px) 28px;
  border: none; border-radius: var(--r-md);
  cursor: pointer; transition: all 0.3s;
  width: 100%;
  -webkit-tap-highlight-color: transparent;
}
.btn-menu.btn-primary {
  background: linear-gradient(135deg, var(--glow-teal), #0090B5);
  color: var(--ocean-deep); font-weight: 700;
  box-shadow: 0 4px 18px var(--glow-teal-dim);
}
.btn-menu.btn-primary:hover,
.btn-menu.btn-primary:active {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,212,255,0.5);
}
.btn-menu.btn-secondary {
  background: rgba(255,255,255,0.06);
  color: var(--foam-white);
  border: 1px solid rgba(0,212,255,0.28);
}
.btn-menu.btn-secondary:hover,
.btn-menu.btn-secondary:active {
  background: rgba(0,212,255,0.1);
  border-color: var(--glow-teal);
}

/* ====================================================
   PANELS (menus de configuración)
   ==================================================== */
#mode-select,
#vs-ai,
#vs-local,
#vs-online,
#rules,
#credits {
  justify-content: flex-start;
  padding: clamp(16px, 4vw, 40px) clamp(12px, 4vw, 24px);
}

.panel-container {
  position: relative; z-index: 2;
  background: rgba(10,22,40,0.93);
  border: 1px solid rgba(0,212,255,0.18);
  border-radius: var(--r-lg);
  padding: clamp(20px, 5vw, 48px);
  width: min(860px, 96vw);
  backdrop-filter: blur(12px);
  box-shadow: 0 0 40px rgba(0,0,0,0.55), inset 0 1px 0 rgba(0,212,255,0.09);
  margin: auto;
}
.panel-container.small { width: min(560px, 96vw); }

.panel-title {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 4vw, 1.8rem);
  font-weight: 700;
  color: var(--foam-white);
  text-align: center;
  margin-bottom: clamp(20px, 4vh, 36px);
  text-shadow: 0 0 18px var(--glow-teal-dim);
}
.panel-desc {
  text-align: center;
  color: rgba(232,244,255,0.7);
  margin-bottom: 20px;
  line-height: 1.6;
  font-size: clamp(0.85rem, 2.5vw, 1rem);
}

/* ---- Mode cards ---- */
.mode-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr));
  gap: clamp(12px, 3vw, 24px);
  margin-bottom: 28px;
}
.mode-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(0,212,255,0.18);
  border-radius: var(--r-md);
  padding: clamp(20px, 4vw, 32px) clamp(16px, 3vw, 24px);
  text-align: center;
  cursor: pointer;
  transition: all 0.28s;
  -webkit-tap-highlight-color: transparent;
}
.mode-card:hover, .mode-card:active {
  background: rgba(0,212,255,0.08);
  border-color: var(--glow-teal);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}
.mode-icon { font-size: clamp(2rem, 6vw, 3rem); margin-bottom: 12px; }
.mode-card h3 {
  font-family: var(--font-display);
  font-size: clamp(0.8rem, 2.5vw, 1rem);
  margin-bottom: 10px;
  color: var(--gold-coral);
}
.mode-card p { font-size: clamp(0.75rem, 2vw, 0.875rem); color: rgba(232,244,255,0.7); line-height: 1.5; }

/* ---- Config sections ---- */
.config-section { margin-bottom: clamp(16px, 3vh, 26px); }
.config-label {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(0.65rem, 1.8vw, 0.8rem);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--glow-teal);
  margin-bottom: 10px;
}

.level-selector {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(130px, 45%), 1fr));
  gap: 8px;
}
.level-btn {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(0,212,255,0.2);
  color: var(--foam-white);
  padding: 9px 6px;
  border-radius: var(--r-sm);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: clamp(0.72rem, 1.8vw, 0.82rem);
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
}
.level-btn:hover, .level-btn.active {
  background: rgba(0,212,255,0.14); border-color: var(--glow-teal); color: var(--glow-teal);
}

.color-selector { display: flex; flex-direction: column; gap: 8px; }
.color-btn {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(0,212,255,0.2);
  color: var(--foam-white);
  padding: 11px 16px;
  border-radius: var(--r-sm);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: clamp(0.8rem, 2.2vw, 0.9rem);
  text-align: left;
  display: flex; align-items: center; gap: 10px;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
}
.color-btn:hover, .color-btn.active {
  background: rgba(0,212,255,0.11); border-color: var(--glow-teal);
}
.piece-preview { font-size: 1.3rem; }

.text-input {
  width: 100%;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(0,212,255,0.24);
  color: var(--foam-white);
  padding: 11px 14px;
  border-radius: var(--r-sm);
  font-family: var(--font-body);
  font-size: clamp(0.9rem, 2.5vw, 1rem);
  outline: none;
  transition: border-color 0.2s;
  -webkit-appearance: none;
}
.text-input:focus { border-color: var(--glow-teal); box-shadow: 0 0 10px var(--glow-teal-dim); }
.text-input::placeholder { color: rgba(232,244,255,0.28); }
.code-input {
  letter-spacing: 0.4em;
  font-size: clamp(1rem, 4vw, 1.2rem);
  text-align: center;
  text-transform: uppercase;
}

/* Toggle */
.toggle-wrap { display: flex; align-items: center; gap: 14px; font-size: clamp(0.82rem, 2.2vw, 0.95rem); flex-wrap: wrap; }
.toggle { position: relative; width: 48px; height: 25px; flex-shrink: 0; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute; inset: 0;
  background: rgba(255,255,255,0.09);
  border-radius: 25px; cursor: pointer;
  transition: 0.3s; border: 1px solid rgba(0,212,255,0.28);
}
.toggle-slider::before {
  content:''; position:absolute;
  left:3px; top:3px;
  width:17px; height:17px;
  background:var(--foam-white); border-radius:50%; transition:0.3s;
}
.toggle input:checked + .toggle-slider { background: var(--glow-teal); border-color: var(--glow-teal); }
.toggle input:checked + .toggle-slider::before { transform:translateX(23px); background:var(--ocean-deep); }

/* Buttons */
.btn-primary {
  background: linear-gradient(135deg, var(--glow-teal), #0090B5);
  color: var(--ocean-deep);
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(0.85rem, 2.5vw, 1rem);
  letter-spacing: 0.07em;
  padding: clamp(11px,2vh,15px) clamp(20px,4vw,32px);
  border: none; border-radius: var(--r-md);
  cursor: pointer; transition: all 0.28s;
  box-shadow: 0 4px 14px var(--glow-teal-dim);
  -webkit-tap-highlight-color: transparent;
}
.btn-primary:hover, .btn-primary:active {
  transform:translateY(-2px); box-shadow:0 8px 24px rgba(0,212,255,0.5);
}
.btn-primary.full-width { width:100%; margin-top:8px; }

.btn-secondary {
  background: rgba(255,255,255,0.06);
  color: var(--foam-white);
  border: 1px solid rgba(0,212,255,0.28);
  font-family: var(--font-display);
  font-size: clamp(0.8rem, 2.2vw, 0.9rem);
  letter-spacing: 0.04em;
  padding: clamp(10px,1.8vh,13px) clamp(16px,3vw,24px);
  border-radius: var(--r-md);
  cursor: pointer; transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
}
.btn-secondary:hover, .btn-secondary:active {
  background:rgba(0,212,255,0.1); border-color:var(--glow-teal);
}
.btn-secondary.small { padding:7px 14px; font-size:0.78rem; }

.btn-back {
  background:none; color:rgba(232,244,255,0.55);
  border:none; font-family:var(--font-body);
  font-size:clamp(0.82rem,2.2vw,0.9rem);
  cursor:pointer; padding:8px 0; transition:color 0.2s;
  -webkit-tap-highlight-color: transparent;
}
.btn-back:hover { color: var(--glow-teal); }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  margin-top: clamp(16px,3vh,26px);
  gap: 10px;
}
.btn-row.center { justify-content: center; }

/* Online tabs */
.online-tabs { display:flex; gap:8px; margin-bottom:20px; }
.tab-btn {
  flex:1; padding:10px;
  background:rgba(255,255,255,0.04);
  border:1px solid rgba(0,212,255,0.2);
  color:var(--foam-white); border-radius:var(--r-sm);
  cursor:pointer; font-family:var(--font-body);
  font-size:clamp(0.8rem,2.2vw,0.9rem);
  transition:all 0.2s;
  -webkit-tap-highlight-color: transparent;
}
.tab-btn.active { background:rgba(0,212,255,0.14); border-color:var(--glow-teal); color:var(--glow-teal); }
.tab-content { display:none; }
.tab-content.active { display:block; }

.room-code { text-align:center; margin-top:20px; }
.room-code.hidden { display:none; }
.code-box {
  font-family:var(--font-display);
  font-size:clamp(1.6rem,7vw,2.4rem);
  letter-spacing:0.4em;
  color:var(--gold-coral);
  background:rgba(255,179,71,0.08);
  border:1px solid rgba(255,179,71,0.28);
  border-radius:var(--r-md);
  padding:14px 20px;
  margin:10px 0;
  text-shadow:var(--shadow-gold);
}
.waiting-msg { color:var(--glow-teal); font-size:0.88rem; animation:pulse 2s infinite; margin-top:10px; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.45} }
.status-msg { text-align:center; padding:11px; border-radius:var(--r-sm); margin-top:10px; font-size:0.9rem; }
.status-msg.hidden { display:none; }
.status-msg.error { background:rgba(200,50,50,0.18); border:1px solid rgba(200,50,50,0.4); color:#ff9999; }
.status-msg.success { background:rgba(0,212,255,0.08); border:1px solid var(--glow-teal); color:var(--glow-teal); }

/* ====================================================
   GAME SCREEN
   ==================================================== */
#game {
  display: flex; flex-direction: column;
  background: var(--abyss-dark);
  padding: 0; overflow: hidden;
  height: 100dvh; /* dynamic viewport height (mobile browsers) */
}

/* ---- HUD ---- */
.game-hud {
  width: 100%;
  display: flex; align-items: center;
  justify-content: space-between;
  padding: 6px clamp(8px, 2vw, 18px);
  background: rgba(6,14,26,0.97);
  border-bottom: 1px solid rgba(0,212,255,0.14);
  z-index: 10; gap: 8px;
  flex-shrink: 0;
  min-height: var(--hud-h);
}

.player-info {
  display:flex; align-items:center; gap:8px;
  min-width: 0; flex: 1;
  overflow: hidden;
}
.player-info.right { flex-direction:row-reverse; }

.player-avatar {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  width: clamp(34px, 5vw, 44px);
  height: clamp(34px, 5vw, 44px);
  display:flex; align-items:center; justify-content:center;
  border-radius:50%;
  border:2px solid rgba(0,212,255,0.28);
  flex-shrink: 0;
}
.white-avatar { border-color:rgba(232,244,255,0.45); background:rgba(232,244,255,0.07); }
.black-avatar  { border-color:rgba(0,212,255,0.38); background:rgba(0,50,100,0.28); }

.player-details { display:flex; flex-direction:column; overflow:hidden; min-width:0; }
.player-name {
  font-family:var(--font-display);
  font-size: clamp(0.7rem, 2vw, 0.95rem);
  font-weight:700; display:block;
  white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
}
.captured-pieces { font-size:0.65rem; opacity:0.55; min-height:14px; white-space:nowrap; overflow:hidden; }
.right-align { text-align:right; }

.player-clock {
  font-family:var(--font-display);
  font-size:clamp(0.85rem, 2.5vw, 1.1rem);
  font-weight:700; color:var(--glow-teal);
  min-width:50px; text-align:center; flex-shrink:0;
}

.game-status-center {
  display:flex; flex-direction:column; align-items:center;
  gap:4px; flex:0 0 auto; padding: 0 4px;
}
.turn-indicator {
  font-family:var(--font-display);
  font-size: clamp(0.65rem, 2vw, 0.9rem);
  color:var(--gold-coral); letter-spacing:0.04em;
  text-align:center; white-space:nowrap;
}
.game-actions-mini { display:flex; gap:4px; }
.mini-btn {
  background:rgba(255,255,255,0.05);
  border:1px solid rgba(0,212,255,0.2);
  color:var(--foam-white);
  padding: clamp(5px,1vw,7px) clamp(7px,1.5vw,11px);
  border-radius:var(--r-sm); cursor:pointer;
  font-size:clamp(0.75rem,2vw,0.9rem); transition:all 0.2s;
  -webkit-tap-highlight-color:transparent;
}
.mini-btn:hover, .mini-btn:active { background:rgba(0,212,255,0.14); border-color:var(--glow-teal); }

/* ---- GAME AREA ---- */
.game-area {
  display:flex; flex:1;
  width:100%;
  min-height:0;   /* allow shrink inside flex column */
  overflow:hidden;
}

/* ---- BOARD WRAP ---- */
.board-wrap {
  flex:1; display:flex;
  align-items:center; justify-content:center;
  padding: clamp(10px,2vw,20px);
  background: radial-gradient(ellipse at center, #0D2240 0%, #060E1A 80%);
  min-width:0; min-height:0;
  overflow:hidden;
}

.board-3d-container {
  display:flex; gap:4px;
  perspective: 900px;
  align-items:flex-start;
}
.board-main-area { display:flex; flex-direction:column; gap:3px; }

.board-labels-left {
  display:flex; flex-direction:column;
  justify-content:space-around;
  padding-bottom:22px;
}
.board-labels-bottom { display:flex; justify-content:space-around; }
.board-label {
  font-family:var(--font-display);
  font-size:clamp(0.55rem,1.2vw,0.7rem);
  color:rgba(0,212,255,0.45);
  width:14px; text-align:center; line-height:1;
}

/* ---- CHESS BOARD ---- */
.chess-board {
  display:grid;
  grid-template-columns: repeat(8, var(--sq));
  grid-template-rows:    repeat(8, var(--sq));
  border:2px solid rgba(0,212,255,0.28);
  box-shadow:
    0 0 28px rgba(0,212,255,0.18),
    0 0 55px rgba(0,0,0,0.75),
    inset 0 0 18px rgba(0,212,255,0.04);
  border-radius:4px;
  transform: rotateX(18deg);
  transform-style:preserve-3d;
  transition: transform 0.4s ease;
}

/* ---- SQUARES ---- */
.square {
  width:var(--sq); height:var(--sq);
  display:flex; align-items:center; justify-content:center;
  cursor:pointer; position:relative;
  transition:background 0.12s ease;
  -webkit-tap-highlight-color: transparent;
}
.square.light { background:var(--sq-light); }
.square.dark  { background:var(--sq-dark);  }
.square:hover,
.square:active { background:rgba(0,212,255,0.2) !important; }
.square.selected { background:var(--sq-selected) !important; box-shadow:inset 0 0 10px rgba(0,212,255,0.48); }

.square.possible-move::after {
  content:''; position:absolute;
  width:34%; height:34%;
  background:var(--gold-coral);
  border-radius:50%; opacity:0.72;
  pointer-events:none;
}
.square.possible-capture {
  background:rgba(220,80,80,0.22) !important;
  border:2px solid rgba(220,80,80,0.48);
}
.square.possible-capture::after { display:none; }
.square.in-check   { background:var(--sq-check) !important; animation:checkFlash 0.8s ease infinite alternate; }
.square.last-move  { background:rgba(255,179,71,0.13) !important; }
@keyframes checkFlash { from{background:rgba(220,50,50,0.28)} to{background:rgba(220,50,50,0.62)} }

/* ---- PIECES ---- */
.piece {
  font-size: var(--piece-fs);
  line-height:1;
  user-select:none; cursor:pointer;
  transition:transform 0.14s ease, filter 0.14s ease;
  z-index:2; position:relative;
  transform-style:preserve-3d;
  /* prevent layout bleed on very small sizes */
  max-width: 100%; max-height: 100%;
}
.piece.white-p {
  color:var(--piece-white);
  filter:drop-shadow(0 -2px 0 rgba(0,0,0,0.55)) drop-shadow(0 0 7px rgba(200,240,255,0.38));
}
.piece.black-p {
  color:#0D4A7A;
  filter:drop-shadow(0 -2px 0 rgba(0,0,0,0.75)) drop-shadow(0 0 7px rgba(0,150,200,0.45));
}
.piece:hover { transform:translateY(-3px) scale(1.07); }
.square.selected .piece {
  transform:translateY(-5px) scale(1.11);
  filter:drop-shadow(0 0 10px var(--glow-teal)) !important;
}

/* ---- SIDE PANEL ---- */
.side-panel {
  width:var(--side-w);
  display:flex; flex-direction:column;
  background:rgba(6,14,26,0.97);
  border-left:1px solid rgba(0,212,255,0.1);
  overflow-y:auto; flex-shrink:0;
  -webkit-overflow-scrolling:touch;
}

.tutor-panel {
  padding:clamp(12px,2vw,20px);
  border-bottom:1px solid rgba(0,212,255,0.1);
  background:rgba(0,212,255,0.025);
}
.tutor-header { display:flex; align-items:center; gap:9px; margin-bottom:10px; }
.tutor-icon { font-size:1.4rem; }
.tutor-name { font-family:var(--font-display); font-size:0.82rem; color:var(--glow-teal); letter-spacing:0.09em; }
.tutor-message {
  font-size:clamp(0.75rem,1.8vw,0.85rem);
  line-height:1.58;
  color:rgba(232,244,255,0.78);
  background:rgba(0,212,255,0.055);
  border-left:2px solid var(--glow-teal);
  padding:9px 11px;
  border-radius:0 var(--r-sm) var(--r-sm) 0;
  margin-bottom:10px;
  min-height:52px;
}
.btn-hint {
  width:100%;
  background:rgba(0,212,255,0.07);
  border:1px solid rgba(0,212,255,0.28);
  color:var(--glow-teal);
  padding:8px; border-radius:var(--r-sm);
  cursor:pointer; font-family:var(--font-body);
  font-size:0.82rem; transition:all 0.2s;
  -webkit-tap-highlight-color:transparent;
}
.btn-hint:hover { background:rgba(0,212,255,0.16); }

.moves-panel, .captured-panel {
  padding:clamp(10px,1.8vw,16px) clamp(12px,2vw,20px);
  border-bottom:1px solid rgba(0,212,255,0.09);
}
.panel-subtitle {
  font-family:var(--font-display);
  font-size:0.72rem; letter-spacing:0.11em;
  text-transform:uppercase;
  color:rgba(0,212,255,0.58); margin-bottom:8px;
}
.moves-list {
  max-height:clamp(100px,15vh,200px);
  overflow-y:auto;
  display:flex; flex-direction:column; gap:2px;
}
.moves-list::-webkit-scrollbar { width:3px; }
.moves-list::-webkit-scrollbar-thumb { background:rgba(0,212,255,0.28); border-radius:2px; }

.move-row {
  display:grid;
  grid-template-columns:26px 1fr 1fr;
  gap:4px; font-size:0.78rem;
  padding:3px 4px; border-radius:3px;
}
.move-row:nth-child(odd) { background:rgba(255,255,255,0.025); }
.move-num { color:rgba(0,212,255,0.48); font-family:var(--font-display); font-size:0.68rem; padding-top:1px; }
.move-white { color:var(--foam-white); font-family:monospace; }
.move-black { color:rgba(232,244,255,0.62); font-family:monospace; }

.cap-row { display:flex; align-items:center; gap:7px; margin-bottom:3px; font-size:0.78rem; }
.cap-label { color:rgba(0,212,255,0.48); font-family:var(--font-display); font-size:0.68rem; letter-spacing:0.04em; min-width:52px; }

/* ---- MODALS ---- */
.modal {
  position:fixed; inset:0;
  background:rgba(0,0,0,0.72);
  display:flex; align-items:center; justify-content:center;
  z-index:200; backdrop-filter:blur(4px);
  padding:16px;
}
.modal.hidden { display:none; }
.modal-box {
  background:var(--ocean-mid);
  border:1px solid rgba(0,212,255,0.28);
  border-radius:var(--r-lg);
  padding:clamp(24px,5vw,40px);
  text-align:center;
  box-shadow:0 0 55px rgba(0,0,0,0.75), 0 0 28px var(--glow-teal-dim);
  max-width:420px; width:100%;
}
.modal-box h3 { font-family:var(--font-display); font-size:clamp(1.1rem,4vw,1.4rem); margin-bottom:10px; color:var(--gold-coral); }
.modal-box p  { color:rgba(232,244,255,0.78); margin-bottom:20px; line-height:1.5; font-size:clamp(0.85rem,2.5vw,1rem); }

.promotion-choices { display:flex; gap:10px; justify-content:center; flex-wrap:wrap; }
.promo-btn {
  background:rgba(0,212,255,0.07);
  border:1px solid rgba(0,212,255,0.28);
  border-radius:var(--r-md);
  padding:clamp(10px,2.5vw,16px);
  cursor:pointer; text-align:center;
  transition:all 0.2s; flex:1; min-width:60px;
  -webkit-tap-highlight-color:transparent;
}
.promo-btn:hover, .promo-btn:active {
  background:rgba(0,212,255,0.2); border-color:var(--glow-teal); transform:translateY(-2px);
}
.promo-btn .promo-piece { font-size:clamp(1.6rem,6vw,2.2rem); display:block; }
.promo-btn .promo-label { font-size:0.68rem; color:rgba(232,244,255,0.58); font-family:var(--font-display); letter-spacing:0.04em; margin-top:4px; display:block; }

.result-box  { max-width:460px; }
.result-icon { font-size:clamp(2.5rem,10vw,4rem); margin-bottom:14px; }
.result-box h3 { font-size:clamp(1.4rem,6vw,2rem); margin-bottom:8px; }

/* ====================================================
   DOCS / RULES / MYTHOLOGY
   ==================================================== */
.docs-container {
  position:relative; z-index:2;
  background:rgba(10,22,40,0.95);
  border:1px solid rgba(0,212,255,0.14);
  border-radius:var(--r-lg);
  padding:clamp(20px,5vw,48px);
  width:min(880px,96vw);
  max-height:calc(100dvh - 32px);
  overflow-y:auto;
  backdrop-filter:blur(12px);
  margin:auto;
  -webkit-overflow-scrolling:touch;
}
.docs-section {
  margin-bottom:clamp(20px,4vh,32px);
  padding-bottom:clamp(20px,4vh,32px);
  border-bottom:1px solid rgba(0,212,255,0.09);
}
.docs-section:last-of-type { border-bottom:none; }
.docs-section h3 {
  font-family:var(--font-display);
  font-size:clamp(0.95rem,3vw,1.1rem);
  color:var(--gold-coral); margin-bottom:14px; letter-spacing:0.04em;
}
.docs-section p, .docs-section li {
  color:rgba(232,244,255,0.78); line-height:1.7;
  margin-bottom:5px; font-size:clamp(0.82rem,2.2vw,0.95rem);
}
.docs-section ul, .docs-section ol { padding-left:22px; }
.docs-section li strong { color:var(--glow-teal); }
.docs-section .note {
  background:rgba(0,212,255,0.04);
  border:1px solid rgba(0,212,255,0.14);
  border-radius:var(--r-sm);
  padding:11px 14px; font-size:0.82rem;
  color:rgba(0,212,255,0.68); margin-top:10px;
}

/* Responsive table */
.table-scroll { width:100%; overflow-x:auto; -webkit-overflow-scrolling:touch; }
.piece-table {
  width:100%; border-collapse:collapse;
  font-size:clamp(0.75rem,2vw,0.875rem);
  min-width:360px;
}
.piece-table th {
  font-family:var(--font-display);
  font-size:clamp(0.65rem,1.6vw,0.75rem);
  letter-spacing:0.09em; text-transform:uppercase;
  color:var(--glow-teal);
  border-bottom:1px solid rgba(0,212,255,0.2);
  padding:9px 10px; text-align:left;
}
.piece-table td {
  padding:9px 10px;
  color:rgba(232,244,255,0.78);
  border-bottom:1px solid rgba(255,255,255,0.035);
}
.piece-table tr:hover td { background:rgba(0,212,255,0.04); }
.piece-table td:first-child { font-size:clamp(1rem,3vw,1.2rem); text-align:center; }

.myth-grid {
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(min(220px,100%),1fr));
  gap:clamp(12px,2.5vw,20px);
  margin-bottom:clamp(20px,4vh,32px);
}
.myth-card {
  background:rgba(255,255,255,0.025);
  border:1px solid rgba(0,212,255,0.14);
  border-radius:var(--r-md); padding:clamp(16px,3vw,24px);
  transition:border-color 0.2s;
}
.myth-card:hover { border-color:rgba(0,212,255,0.38); background:rgba(0,212,255,0.04); }
.myth-symbol { font-size:clamp(1.8rem,5vw,2.5rem); margin-bottom:8px; }
.myth-card h3 { font-family:var(--font-display); font-size:clamp(0.8rem,2.2vw,0.9rem); color:var(--gold-coral); margin-bottom:7px; }
.myth-card p  { font-size:clamp(0.78rem,2vw,0.85rem); color:rgba(232,244,255,0.68); line-height:1.58; }

/* ====================================================
   SCROLLBARS
   ==================================================== */
::-webkit-scrollbar { width:5px; height:5px; }
::-webkit-scrollbar-track { background:rgba(0,0,0,0.18); }
::-webkit-scrollbar-thumb { background:rgba(0,212,255,0.28); border-radius:3px; }
::-webkit-scrollbar-thumb:hover { background:rgba(0,212,255,0.48); }

/* ====================================================
   RESPONSIVE — DESKTOP LARGE (≥1200px)
   ==================================================== */
@media (min-width:1200px) {
  :root {
    --sq: min(84px, calc((100vh - 140px) / 8));
    --side-w: 300px;
    --hud-h: 70px;
  }
}

/* ====================================================
   RESPONSIVE — TABLET LANDSCAPE (900–1199px)
   ==================================================== */
@media (max-width:1199px) and (min-width:901px) {
  :root {
    --sq: min(72px, calc((100vh - 130px) / 8));
    --side-w: 240px;
  }
}

/* ====================================================
   RESPONSIVE — TABLET PORTRAIT (601–900px)
   Side panel goes BELOW board
   ==================================================== */
@media (max-width:900px) {
  :root {
    --sq: min(60px, calc((100vw - 60px) / 8));
    --hud-h: 58px;
  }

  .game-area {
    flex-direction: column;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .board-wrap {
    flex: 0 0 auto;
    padding: clamp(8px,2vw,16px);
  }

  .chess-board { transform: rotateX(10deg); }

  .side-panel {
    width: 100%;
    flex-direction: row;
    flex: 0 0 auto;
    border-left: none;
    border-top: 1px solid rgba(0,212,255,0.1);
    overflow-x: auto;
    overflow-y: hidden;
    min-height: 160px;
    max-height: 180px;
  }
  .tutor-panel, .moves-panel, .captured-panel {
    flex: 1 0 200px;
    border-bottom: none;
    border-right: 1px solid rgba(0,212,255,0.09);
    overflow-y: auto;
  }
  .captured-panel { border-right: none; }

  .level-selector { grid-template-columns: repeat(3, 1fr); }
}

/* ====================================================
   RESPONSIVE — MOBILE LARGE (481–600px)
   ==================================================== */
@media (max-width:600px) {
  :root {
    --sq: min(46px, calc((100vw - 52px) / 8));
    --hud-h: 52px;
  }

  body { overflow-y: auto; }

  .panel-container { padding: 18px 14px; }
  .docs-container  { padding: 18px 14px; }

  .game-title { font-size: clamp(2rem, 10vw, 2.8rem); }
  .mode-cards { grid-template-columns: 1fr; }

  .chess-board { transform: rotateX(6deg); }

  .side-panel {
    flex-direction: column;
    width: 100%;
    max-height: 240px;
    overflow-y: auto;
  }

  /* HUD compact */
  .player-avatar { display: none; }
  .player-clock  { min-width: 40px; font-size: 0.82rem; }
  .captured-pieces { display: none; }

  /* Promotion modal full width */
  .promotion-choices { gap: 6px; }
  .promo-btn { padding: 10px 6px; min-width: 50px; }

  /* Docs table scrollable */
  .docs-section { overflow-x: auto; }
}

/* ====================================================
   RESPONSIVE — MOBILE SMALL (≤480px)
   ==================================================== */
@media (max-width:480px) {
  :root {
    --sq: min(40px, calc((100vw - 44px) / 8));
    --hud-h: 48px;
  }

  .game-title { font-size: clamp(1.7rem,9vw,2.2rem); }

  .game-hud { padding: 4px 8px; gap: 4px; }
  .turn-indicator { font-size: 0.62rem; }

  .mini-btn { padding: 4px 6px; font-size: 0.72rem; }

  /* Hide non-essential side panels on very small screens */
  .captured-panel { display: none; }

  .moves-list { max-height: 80px; }

  .modal-box { padding: 18px 14px; }
  .result-icon { font-size: 2rem; }
  .result-box h3 { font-size: 1.3rem; }
}

/* ====================================================
   RESPONSIVE — TINY (≤360px) — e.g. old phones
   ==================================================== */
@media (max-width:360px) {
  :root {
    --sq: calc((100vw - 36px) / 8);
  }
  .game-status-center { display: none; }
  .side-panel { max-height: 180px; }
}

/* ====================================================
   LANDSCAPE MOBILE — important edge case
   ==================================================== */
@media (max-height:500px) and (orientation:landscape) {
  :root {
    --sq: min(46px, calc((100vh - 100px) / 8));
    --hud-h: 44px;
    --side-w: 200px;
  }

  #game { flex-direction: column; }

  .game-area { flex-direction: row; overflow: hidden; }

  .board-wrap { padding: 6px; }
  .chess-board { transform: none; } /* sin tilt en landscape pequeño */

  .side-panel {
    width: var(--side-w);
    flex-direction: column;
    max-height: none;
    border-left: 1px solid rgba(0,212,255,0.1);
    border-top: none;
  }
  .moves-list { max-height: 80px; }

  .tutor-message { min-height: 36px; font-size: 0.72rem; }

  /* HUD compacto */
  .game-hud { min-height: var(--hud-h); padding: 3px 8px; }
  .player-avatar { width: 28px; height: 28px; font-size: 1rem; }
  .player-name { font-size: 0.68rem; }

  /* Splash en landscape */
  .splash-content { gap: 16px; }
  .game-title { font-size: clamp(1.5rem,6vh,2.5rem); }
}

/* ====================================================
   ACCESIBILIDAD — reduce motion
   ==================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ====================================================
   ONLINE P2P — elementos específicos
   ==================================================== */

/* Barra de estado PeerJS */
.peer-status-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: rgba(0,212,255,0.05);
  border: 1px solid rgba(0,212,255,0.14);
  border-radius: var(--r-sm);
  margin-bottom: 18px;
  font-size: 0.82rem;
  color: rgba(232,244,255,0.7);
}
.peer-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
  background: #888;
  transition: background 0.3s;
}
.peer-dot.peer-connecting { background: var(--gold-coral); animation: pulse 1.2s infinite; }
.peer-dot.peer-ready      { background: #44ff88; box-shadow: 0 0 6px #44ff88; }
.peer-dot.peer-error      { background: #ff5555; }

/* Sección código */
.code-section {
  text-align: center;
  padding: 16px;
  background: rgba(255,179,71,0.05);
  border: 1px solid rgba(255,179,71,0.18);
  border-radius: var(--r-md);
  margin-bottom: 16px;
}
.code-label {
  font-size: 0.82rem;
  color: rgba(232,244,255,0.6);
  margin-bottom: 8px;
}
.code-box {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 7vw, 2.8rem);
  letter-spacing: 0.35em;
  color: var(--gold-coral);
  text-shadow: var(--shadow-gold);
  padding: 10px 0;
  word-break: break-all;
}
.code-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 10px;
  flex-wrap: wrap;
}

/* Spinner de espera */
.connection-status {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  background: rgba(0,212,255,0.04);
  border: 1px solid rgba(0,212,255,0.12);
  border-radius: var(--r-md);
  font-size: 0.88rem;
  color: rgba(232,244,255,0.7);
  margin-bottom: 12px;
}
.conn-spinner {
  width: 18px; height: 18px;
  border: 2px solid rgba(0,212,255,0.2);
  border-top-color: var(--glow-teal);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Rival unido */
.rival-joined {
  background: rgba(68, 255, 136, 0.06);
  border: 1px solid rgba(68,255,136,0.22);
  border-radius: var(--r-md);
  padding: 16px;
  margin-bottom: 12px;
  text-align: center;
}
.rival-joined.hidden { display: none; }

.rival-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.rival-avatar { font-size: 1.8rem; }
.rival-info span:nth-child(2) {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: #44ff88;
  font-weight: 700;
}
.rival-badge {
  font-size: 0.78rem;
  color: rgba(68,255,136,0.7);
  background: rgba(68,255,136,0.1);
  padding: 2px 8px;
  border-radius: 20px;
}

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

/* ====================================================
   SHARE PANEL — redes sociales
   ==================================================== */

.btn-copy-big {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  margin-top: 10px;
  padding: 12px;
  background: rgba(0,212,255,0.1);
  border: 1px dashed rgba(0,212,255,0.4);
  border-radius: var(--r-sm);
  color: var(--glow-teal);
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
}
.btn-copy-big:hover, .btn-copy-big:active {
  background: rgba(0,212,255,0.2);
  border-style: solid;
}
.copy-icon { font-size: 1.1rem; }

.share-panel {
  margin-top: 16px;
}
.share-title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(0,212,255,0.55);
  margin-bottom: 10px;
  text-align: center;
}

.share-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.share-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 10px 4px 8px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--r-md);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #fff;
  transition: all 0.22s;
  -webkit-tap-highlight-color: transparent;
  background: rgba(255,255,255,0.04);
}
.share-btn:hover, .share-btn:active {
  transform: translateY(-2px);
  filter: brightness(1.15);
}

.share-logo {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

/* Colores de marca */
.share-btn.whatsapp  { border-color: rgba(37,211,102,0.35);  color: #25D366; }
.share-btn.whatsapp:hover  { background: rgba(37,211,102,0.12);  box-shadow: 0 4px 14px rgba(37,211,102,0.2); }

.share-btn.telegram  { border-color: rgba(0,136,204,0.35);   color: #29B6F6; }
.share-btn.telegram:hover  { background: rgba(0,136,204,0.12);   box-shadow: 0 4px 14px rgba(0,136,204,0.2); }

.share-btn.email     { border-color: rgba(234,67,53,0.35);   color: #EA4335; }
.share-btn.email:hover     { background: rgba(234,67,53,0.12);   box-shadow: 0 4px 14px rgba(234,67,53,0.2); }

.share-btn.twitter   { border-color: rgba(255,255,255,0.25); color: #e7e7e7; }
.share-btn.twitter:hover   { background: rgba(255,255,255,0.09); box-shadow: 0 4px 14px rgba(255,255,255,0.12); }

.share-btn.facebook  { border-color: rgba(24,119,242,0.35);  color: #1877F2; }
.share-btn.facebook:hover  { background: rgba(24,119,242,0.12);  box-shadow: 0 4px 14px rgba(24,119,242,0.2); }

.share-btn.discord   { border-color: rgba(88,101,242,0.35);  color: #5865F2; }
.share-btn.discord:hover   { background: rgba(88,101,242,0.12);  box-shadow: 0 4px 14px rgba(88,101,242,0.2); }

.share-btn.instagram { border-color: rgba(225,48,108,0.35);  color: #E1306C; }
.share-btn.instagram:hover { background: rgba(225,48,108,0.12);  box-shadow: 0 4px 14px rgba(225,48,108,0.2); }

.share-btn.sms       { border-color: rgba(76,175,80,0.35);   color: #66BB6A; }
.share-btn.sms:hover       { background: rgba(76,175,80,0.12);   box-shadow: 0 4px 14px rgba(76,175,80,0.2); }

/* Toast de confirmación */
.share-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(10, 22, 40, 0.97);
  border: 1px solid var(--glow-teal);
  color: var(--glow-teal);
  padding: 11px 22px;
  border-radius: 30px;
  font-size: 0.88rem;
  font-family: var(--font-body);
  box-shadow: 0 4px 20px rgba(0,212,255,0.3);
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s, transform 0.28s;
  white-space: nowrap;
  max-width: 90vw;
  text-align: center;
}
.share-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Responsive: 3 columnas en móvil pequeño */
@media (max-width: 480px) {
  .share-grid { grid-template-columns: repeat(4, 1fr); gap: 6px; }
  .share-btn  { padding: 8px 2px 6px; font-size: 0.6rem; }
  .share-logo { width: 18px; height: 18px; }
}
@media (max-width: 360px) {
  .share-grid { grid-template-columns: repeat(4, 1fr); gap: 4px; }
  .share-btn span:not(.share-logo) { display: none; }  /* solo íconos */
  .share-btn { padding: 10px 4px; }
}