/* ============================================================
   CYNUS Chess Academy — Stylesheet
   © 2025 Andrea Raso — All rights reserved
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Cinzel+Decorative:wght@400;700;900&family=Cinzel:wght@400;600;700&family=Barlow+Condensed:wght@300;400;500;600;700&display=swap');

:root {
  --bg:    #1e1a14;
  --bg2:   #252018;
  --panel: #2e2820;
  --panel2:#382e24;
  --bord:  #5a4e38;
  --bord2: #7a6848;
  --gold:  #c9a84c;
  --gold2: #e8c96a;
  --gold3: #f5e4a0;
  --teal:  #2ab8a6;
  --teal2: #1e9888;
  --red:   #d94040;
  --green: #28b87a;
  --orange:#e8902a;
  --text:  #d8c8a8;
  --text2: #f8f0e0;
  --dim:   #b09878;
  --wsq:   #eedcaa;
  --bsq:   #5a7842;
  --gg:    rgba(201,168,76,.25);
  --gt:    rgba(42,184,166,.18);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 16px;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  -webkit-tap-highlight-color: transparent;
}
button, .menu-card, .cpick, .level-card, .time-card, .learn-card, .lbtn, .les-tab {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

/* Grid background */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(201,168,76,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201,168,76,.06) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none; z-index: 0;
}

/* ═══ SCREENS ═══ */
.screen {
  position: fixed; inset: 0;
  display: none; flex-direction: column;
  z-index: 10;
  opacity: 0;
  transition: opacity .35s ease;
}
.screen.active { display: flex; opacity: 1; }
.screen.fade-in { animation: fadein .4s ease forwards; }
@keyframes fadein { from{opacity:0;transform:translateY(12px)} to{opacity:1;transform:translateY(0)} }

/* ═══ HEADER ═══ */
.app-header {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: nowrap; gap: 8px;
  padding: 0 20px;
  height: 48px;
  background: rgba(30,26,20,.96);
  border-bottom: 1px solid var(--bord2);
  backdrop-filter: blur(16px);
  position: relative; z-index: 20; flex-shrink: 0;
}
.app-header .back-btn {
  display: flex; align-items: center; gap: 6px;
  font-size: .78rem; letter-spacing: .08em; color: var(--teal);
  cursor: pointer; background: none; border: none;
  font-family: 'Barlow Condensed', sans-serif;
  transition: opacity .2s;
}
.app-header .back-btn:hover { opacity: .7; }
.header-title {
  font-family: 'Cinzel', serif; font-size: .82rem; font-weight: 700;
  color: var(--gold2); letter-spacing: .12em; text-align: center;
}
.ble-status {
  display: flex; align-items: center; gap: 5px;
  font-size: .72rem; color: var(--text);
  cursor: pointer; padding: 4px 10px;
  height: 30px; box-sizing: border-box;
  border: 1px solid var(--bord); border-radius: 16px;
  background: var(--panel); transition: all .2s;
  white-space: nowrap;
}
.ble-status:hover { border-color: var(--teal); }
.ble-status.conn { color: var(--teal); border-color: rgba(38,201,180,.4); background: rgba(38,201,180,.06); }
.ble-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--dim); flex-shrink: 0; }
.ble-status.conn .ble-dot { background: var(--teal); box-shadow: 0 0 6px var(--teal); animation: blink 2s infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.25} }

/* ═══ HOME SCREEN ═══ */
#screenHome {
  align-items: stretch; justify-content: flex-start;
  overflow-y: auto;
  background: var(--bg);
}
.home-logo {
  text-align: center; margin-bottom: clamp(12px, 3vh, 40px);
}
.home-logo .logo-icon {
  font-size: 5rem; line-height: 1; margin-bottom: 16px;
  filter: drop-shadow(0 0 24px rgba(201,168,76,.4));
}
.home-logo h1 {
  font-family: 'Cinzel Decorative', serif;
  font-size: 2.4rem; font-weight: 900;
  color: var(--gold2);
  letter-spacing: .08em;
  text-shadow: 0 0 40px rgba(201,168,76,.3);
}
.home-logo h1 span { color: var(--teal); }
.home-logo p {
  font-size: .8rem; letter-spacing: .28em; color: var(--dim);
  margin-top: 6px; text-transform: uppercase;
}

.home-menu { display: flex; flex-direction: column; gap: 14px; width: 100%; max-width: 420px; }
.menu-card {
  background: linear-gradient(135deg, var(--panel) 0%, var(--panel2) 100%);
  border: 1px solid var(--bord);
  border-radius: 14px; padding: 22px 24px;
  cursor: pointer; transition: all .25s;
  display: flex; align-items: center; gap: 18px;
  position: relative; overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,.25);
}
.menu-card::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.02) 0%, transparent 60%);
  pointer-events: none;
}
.menu-card:hover { border-color: var(--gold); transform: translateX(4px); }
.menu-card:hover .menu-arrow { opacity: 1; transform: translateX(0); }
.menu-card.play:hover { box-shadow: 0 0 24px rgba(201,168,76,.12); }
.menu-card.learn:hover { border-color: var(--teal); box-shadow: 0 0 24px rgba(38,201,180,.12); }
.menu-card.robot:hover { border-color: var(--orange); box-shadow: 0 0 24px rgba(240,150,42,.12); }

.menu-icon { font-size: 2.2rem; flex-shrink: 0; }
.menu-text h2 { font-family: 'Cinzel', serif; font-size: 1.15rem; color: var(--text2); margin-bottom: 4px; }
.menu-text p { font-size: .82rem; color: var(--text); line-height: 1.55; }
.menu-arrow { margin-left: auto; color: var(--gold); font-size: 1.2rem; opacity: 0; transform: translateX(-6px); transition: all .25s; flex-shrink: 0; }
.menu-card.learn .menu-arrow { color: var(--teal); }
.menu-card.robot .menu-arrow { color: var(--orange); }

.home-ble-bar {
  margin-top: 32px; display: flex; align-items: center; gap: 10px;
  font-size: .65rem; letter-spacing: .1em;
}
.ble-connect-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 18px; border: 1px solid var(--bord2);
  border-radius: 20px; background: var(--panel);
  color: var(--text2); font-family: 'Barlow Condensed', sans-serif;
  font-size: .82rem; letter-spacing: .06em; cursor: pointer;
  transition: all .25s;
}
.ble-connect-btn:hover { border-color: var(--teal); color: var(--teal); }
.ble-connect-btn.conn { border-color: var(--teal); color: var(--teal); background: rgba(38,201,180,.06); }

/* ═══ SETUP SCREENS ═══ */
.setup-screen {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: flex-start;
  padding: clamp(12px,3vh,32px) 16px;
  overflow-y: auto; min-height: 0;
}
.setup-screen { justify-content: center; }
.setup-title {
  font-family: 'Cinzel', serif; font-size: 1.3rem; font-weight: 700;
  color: var(--gold2); letter-spacing: .1em; margin-bottom: 8px; text-align: center;
}
.setup-sub { font-size: .88rem; color: var(--text); text-align: center; margin-bottom: 32px; letter-spacing: .06em; }

/* Level grid */
.level-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; width: 100%; max-width: 420px; margin-bottom: 28px; }
.level-card {
  background: linear-gradient(160deg, var(--panel) 0%, var(--panel2) 100%);
  border: 2px solid var(--bord);
  border-radius: 12px; padding: 20px 14px; text-align: center;
  cursor: pointer; transition: all .22s;
  box-shadow: 0 2px 10px rgba(0,0,0,.2);
}
.level-card:hover { border-color: var(--gold); }
.level-card.sel { border-color: var(--gold2); background: rgba(201,168,76,.08); box-shadow: 0 0 18px rgba(201,168,76,.15); }
.level-card .lv-icon { font-size: 1.8rem; margin-bottom: 7px; }
.level-card .lv-name { font-family: 'Cinzel', serif; font-size: .95rem; color: var(--text2); margin-bottom: 4px; font-weight: 600; }
.level-card .lv-elo { font-size: .78rem; color: var(--text); }

/* Color picker */
.color-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; width: 100%; max-width: 360px; margin-bottom: 28px; }
.cpick {
  border-radius: 14px; padding: 28px 14px; text-align: center;
  cursor: pointer; transition: all .22s;
  border: 2px solid var(--bord); background: var(--panel);
}
.cpick:hover { transform: scale(1.02); }
.cpick .cp-piece { font-size: 3rem; line-height: 1; margin-bottom: 10px; }
/* White piece in picker */
.cpick .cp-piece-wrap {
  width: 90px; height: 90px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 14px;
}
.cpick .cp-uni {
  font-size: 4rem;
  line-height: 1;
  display: block;
}
/* White pawn on dark background */
.cpick.white-card .cp-uni.pw {
  color: #ffffff;
  -webkit-text-stroke: 3px #1a0800;
  paint-order: stroke fill;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,.9));
}
/* Black pawn on light background */
.cpick.black-card .cp-uni.pb {
  color: #0d0500;
  -webkit-text-stroke: 3px #c89030;
  paint-order: stroke fill;
  filter: drop-shadow(0 1px 2px rgba(180,130,0,.3));
}
/* Card BIANCO: sfondo caldo, pezzo avorio su sfondo scuro interno */
/* BIANCO card: dark board-green background, white piece clearly visible */
.cpick.white-card {
  background: linear-gradient(160deg, #2e3820 0%, #1e2818 100%);
  border: 2px solid #4a6030;
}
.cpick.white-card:hover { border-color: #c9a84c; }
.cpick.white-card .cp-piece-wrap {
  background: var(--bsq); /* board dark square color */
  border: 1px solid rgba(255,255,255,.1);
  box-shadow: inset 0 2px 8px rgba(0,0,0,.4);
}
.cpick.white-card .cp-label { color: #f0dfa0; font-weight: 700; }
.cpick.white-card .cp-sub  { color: #8a9870; }
/* NERO card: light board-cream background, black piece clearly visible */
.cpick.black-card {
  background: linear-gradient(160deg, #c8bc8c 0%, #b8ac7c 100%);
  border: 2px solid #9a8850;
}
.cpick.black-card:hover { border-color: #26c9b4; }
.cpick.black-card .cp-piece-wrap {
  background: var(--wsq); /* board light square color */
  border: 1px solid rgba(0,0,0,.15);
  box-shadow: inset 0 2px 6px rgba(0,0,0,.12);
}
.cpick.black-card .cp-label { color: #1a0e04; font-weight: 700; }
.cpick.black-card .cp-sub  { color: #3a2a10; }
/* Pezzo BIANCO: avorio brillante con bordo scuro */
.cpick .cp-piece.pw {
  color: #fffbf0;
  -webkit-text-stroke: 2px #1a0e00;
  text-shadow: 0 2px 8px rgba(0,0,0,.95);
}
/* Pezzo NERO: antracite scuro con bordo sottile */
.cpick .cp-piece.pb {
  color: #0d0804;
  -webkit-text-stroke: 1.5px #3a2a10;
  text-shadow: 0 1px 4px rgba(0,0,0,.3);
}
.cpick .cp-label { font-family: 'Cinzel', serif; font-size: .9rem; font-weight: 700; }
.cpick .cp-sub { font-size: .62rem; margin-top: 4px; }
.cpick.sel-w { border-color: #c9a84c !important; box-shadow: 0 0 28px rgba(201,168,76,.5) !important; }
.cpick.sel-b { border-color: var(--teal) !important; box-shadow: 0 0 28px rgba(38,201,180,.5) !important; }

/* Time picker */
.time-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; width: 100%; max-width: 380px; margin-bottom: 28px; }
.time-card {
  background: linear-gradient(160deg, var(--panel) 0%, var(--panel2) 100%);
  border: 2px solid var(--bord);
  border-radius: 10px; padding: 18px 8px; text-align: center;
  cursor: pointer; transition: all .22s;
  box-shadow: 0 2px 10px rgba(0,0,0,.2);
}
.time-card:hover { border-color: var(--gold); }
.time-card.sel { border-color: var(--gold2); background: rgba(201,168,76,.08); }
.time-card .tc-icon { font-size: 1.4rem; margin-bottom: 5px; }
.time-card .tc-val { font-family: 'Cinzel', serif; font-size: 1rem; color: var(--text2); }
.time-card .tc-lbl { font-size: .6rem; color: var(--dim); margin-top: 2px; }

/* Buttons */
.btn-primary {
  width: 100%; max-width: 380px; padding: 16px;
  background: linear-gradient(135deg, #c08828, #e8b840, #d4a030);
  border: none; border-radius: 12px; color: #1a0e00;
  font-family: 'Cinzel', serif; font-size: .95rem; font-weight: 700;
  letter-spacing: .12em; cursor: pointer;
  transition: all .22s; box-shadow: 0 4px 20px rgba(201,168,76,.25);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(201,168,76,.4); }
.btn-primary:disabled { opacity: .3; cursor: not-allowed; transform: none; }

.btn-secondary {
  width: 100%; max-width: 380px; padding: 13px;
  background: transparent; border: 1px solid var(--bord2);
  border-radius: 10px; color: var(--text);
  font-family: 'Barlow Condensed', sans-serif; font-size: .82rem;
  letter-spacing: .1em; cursor: pointer; transition: all .22s;
}
.btn-secondary:hover { border-color: var(--teal); color: var(--teal); }

/* ═══ GAME SCREEN ═══ */
#screenGame { background: var(--bg2); overflow: hidden; }
.game-layout { flex: 1; display: grid; grid-template-columns: 240px 1fr 280px; gap: 0; overflow: hidden; }

/* Left sidebar */
.game-left { background: var(--bg2); border-right: 1px solid var(--bord); padding: 14px; display: flex; flex-direction: column; gap: 12px; overflow-y: auto; }
/* Right sidebar */
.game-right { background: var(--bg2); border-left: 1px solid var(--bord); padding: 14px; display: flex; flex-direction: column; gap: 12px; overflow-y: auto; }

.sidebar-section { background: var(--panel); border: 1px solid var(--bord); border-radius: 10px; padding: 12px; box-shadow: 0 1px 6px rgba(0,0,0,.15); }
.ss-title { font-size: .75rem; letter-spacing: .16em; text-transform: uppercase; color: var(--gold2); font-weight: 600; padding-bottom: 8px; border-bottom: 1px solid var(--bord); margin-bottom: 9px; }

/* Player bar */
.pbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; border-radius: 10px;
  border: 1px solid var(--bord);
  background: linear-gradient(135deg, var(--panel2) 0%, var(--panel) 100%);
  transition: all .3s;
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
  gap: 8px;
}
.pbar.active { border-color: var(--gold); box-shadow: 0 0 12px rgba(201,168,76,.15); }
.pbar.robot-active { border-color: var(--teal); box-shadow: 0 0 12px var(--gt); }
.pbar .pname { font-family: 'Cinzel', serif; font-size: .9rem; color: var(--text2); }
.pbar .ptimer { font-size: 1.25rem; font-weight: 700; color: var(--gold2); font-variant-numeric: tabular-nums; }

/* Center board area */
.game-center {
  display: flex; flex-direction: column; align-items: center; justify-content: flex-start;
  padding: 16px 12px; gap: 10px; flex: 1; overflow-y: auto;
}

.verify-btn {
  padding: 12px 28px; border-radius: 30px;
  background: rgba(240,150,42,.1); border: 1.5px solid rgba(240,150,42,.5);
  color: var(--orange); font-family: 'Barlow Condensed', sans-serif;
  font-size: .9rem; letter-spacing: .1em; font-weight: 600; cursor: pointer;
  transition: all .25s; display: flex; align-items: center; gap: 8px;
}
.verify-btn:hover { background: rgba(240,150,42,.2); }
.verify-btn.ok { background: rgba(34,201,133,.08); border-color: rgba(34,201,133,.4); color: var(--green); }
.verify-btn.ok:hover { background: rgba(34,201,133,.15); }

/* Board */
.board-wrap { position: relative; }
.board-coords-rank { position: absolute; left: -18px; top: 0; display: flex; flex-direction: column; }
.board-coords-rank span { font-size: .48rem; color: var(--dim); display: flex; align-items: center; justify-content: center; }
.board-coords-file { display: flex; margin-top: 3px; }
.board-coords-file span { font-size: .48rem; color: var(--dim); text-align: center; }

#board {
  display: grid;
  border: 2px solid var(--gold);
  border-radius: 2px; overflow: hidden;
  box-shadow: 0 0 0 5px rgba(5,7,9,.98), 0 0 40px rgba(201,168,76,.1), 0 12px 40px rgba(0,0,0,.9);
}
.sq {
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; position: relative; transition: background .1s; user-select: none;
}
.sq.l { background: var(--wsq); }
.sq.d { background: var(--bsq); }
.sq.sel { outline: 3px solid rgba(232,201,106,.9); outline-offset: -3px; z-index: 2; }
.sq.lhi { background: rgba(38,201,180,.45) !important; }
.sq.lmv { background: rgba(201,168,76,.3) !important; }
.sq.chk { background: rgba(232,69,69,.55) !important; animation: ck .5s; }
.sq.illegal { background: rgba(232,69,69,.45) !important; animation: illegal-flash .6s ease; }
@keyframes illegal-flash {
  0%   { background: rgba(232,69,69,.7) !important; transform: scale(1.04); }
  40%  { background: rgba(232,69,69,.3) !important; }
  100% { background: rgba(232,69,69,.0) !important; transform: scale(1); }
}
.sq.no-moves { background: rgba(240,150,42,.45) !important; animation: no-moves-flash .6s ease; }
@keyframes no-moves-flash {
  0%  { background: rgba(240,150,42,.7) !important; }
  100%{ background: rgba(240,150,42,.0) !important; }
}
.sq.wrong { background: rgba(232,69,69,.4) !important; }
.sq.miss { background: rgba(240,150,42,.35) !important; }
.sq .dot { position: absolute; width: 28%; height: 28%; background: rgba(0,0,0,.22); border-radius: 50%; pointer-events: none; }
.sq.lhi .dot { display: none; }
.sq.lhi::after { content:''; position:absolute; inset:0; background:rgba(38,201,180,.15); }
/* Piece styles */
.sq .pw {
  /* WHITE pieces: solid white with thick dark outline — visible on BOTH square colors */
  color: #ffffff;
  -webkit-text-stroke: 3px #1a0800;
  paint-order: stroke fill;
  filter: drop-shadow(0 1px 3px rgba(0,0,0,.8));
  line-height: 1; z-index: 3; pointer-events: none;
}
.sq .pb {
  /* BLACK pieces: near-black with amber outline — visible on BOTH square colors */
  color: #0d0500;
  -webkit-text-stroke: 3px #d4a030;
  paint-order: stroke fill;
  filter: drop-shadow(0 1px 2px rgba(255,200,80,.25));
  line-height: 1; z-index: 3; pointer-events: none;
}

/* Status bar below board */
.game-status {
  padding: 9px 18px; border-radius: 8px;
  border: 1px solid var(--bord);
  background: linear-gradient(135deg, var(--panel) 0%, var(--panel2) 100%);
  font-size: .9rem; color: var(--text2); font-weight: 500; text-align: center;
  min-height: 38px; display: flex; align-items: center; justify-content: center;
  transition: all .3s; max-width: 560px; width: 100%;
}
.game-status.chk { border-color: var(--red); color: var(--red); }
.game-status.mate { border-color: var(--gold); background: rgba(201,168,76,.08); color: var(--gold2); }
.game-status.ble-info { border-color: var(--teal); color: var(--teal); }
.game-status.ok { border-color: var(--green); color: var(--green); }
.game-status.warn { border-color: var(--orange); color: var(--orange); }

/* Move list */
.mlist-wrap { display: flex; flex-direction: column; flex: 1; min-height: 0; }
.mlist-header {
  display: grid; grid-template-columns: 28px 1fr 1fr;
  padding: 5px 6px; border-bottom: 1px solid var(--bord2);
  font-size: .62rem; letter-spacing: .08em; font-weight: 600;
}
.mlist-header .mh-n { color: var(--dim); }
.mlist-header .mh-r { color: var(--teal); }
.mlist-header .mh-h { color: var(--gold2); }
.mlist {
  flex: 1; overflow-y: auto; min-height: 0; height: 130px;
  display: grid; grid-template-columns: 28px 1fr 1fr;
  align-content: start;
  gap: 1px; font-size: .82rem;
  scrollbar-width: thin; scrollbar-color: var(--bord) transparent;
}
.mn { color: var(--dim); font-size: .7rem; padding: 4px 4px 4px 6px; display: flex; align-items: center; border-bottom: 1px solid rgba(255,255,255,.03); }
.mr { color: var(--teal); padding: 4px 6px; display: flex; align-items: center; font-family: 'Barlow Condensed',sans-serif; letter-spacing:.04em; border-bottom: 1px solid rgba(255,255,255,.03); }
.mh { color: var(--gold2); padding: 4px 6px; display: flex; align-items: center; font-family: 'Barlow Condensed',sans-serif; letter-spacing:.04em; border-bottom: 1px solid rgba(255,255,255,.03); }
.mr.cur { background: rgba(42,184,166,.15); border-radius: 3px; font-weight: 700; }
.mh.cur { background: rgba(201,168,76,.15); border-radius: 3px; font-weight: 700; }
.gameover-ov {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.92);
  backdrop-filter: blur(12px);
  display: none;
  align-items: center; justify-content: center;
  z-index: 900;
  pointer-events: none;
}
.gameover-ov.open { display: flex; pointer-events: all; }
.gameover-box {
  background: linear-gradient(160deg, #2e2820, #38301e);
  border: 1px solid var(--gold2);
  border-radius: 20px; padding: 44px 40px; text-align: center;
  max-width: 420px; width: 90%;
  animation: popin .4s cubic-bezier(.34,1.56,.64,1);
  box-shadow: 0 0 60px rgba(201,168,76,.2);
}
@keyframes popin { from{opacity:0;transform:scale(.75)} to{opacity:1;transform:scale(1)} }
.go-icon { font-size: 3.5rem; margin-bottom: 14px; }
.go-title { font-family: 'Cinzel Decorative', serif; font-size: 1.6rem; color: var(--gold2); margin-bottom: 8px; }
.go-sub { font-size: .92rem; color: var(--text2); line-height: 1.82; margin-bottom: 28px; }
.go-stats { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; margin-bottom: 28px; }
.go-stat { background: rgba(0,0,0,.2); border: 1px solid var(--bord2); border-radius: 8px; padding: 12px 6px; text-align: center; }
.go-stat-val { font-family: 'Cinzel', serif; font-size: 1.4rem; color: var(--gold2); font-weight: 700; }
.go-stat-lbl { font-size: .75rem; color: var(--text); margin-top: 4px; }
.go-btns { display: flex; gap: 10px; }
.go-btn { flex: 1; padding: 13px; border-radius: 10px; border: none; font-family: 'Cinzel', serif; font-size: .8rem; cursor: pointer; transition: all .2s; letter-spacing: .1em; }
.go-btn.pri { background: linear-gradient(135deg, var(--gold), var(--gold2)); color: #0a0800; }
.go-btn.sec { background: var(--panel2); border: 1px solid var(--bord2); color: var(--text); }
.go-btn:hover { transform: translateY(-2px); }

/* ═══ PROMO OVERLAY ═══ */
.promo-ov { position: fixed; inset: 0; background: rgba(0,0,0,.9); backdrop-filter: blur(8px); display: none; align-items: center; justify-content: center; z-index: 600; }
.promo-ov.open { display: flex; }
.promo-box { background: var(--panel); border: 1px solid var(--gold); border-radius: 16px; padding: 28px; text-align: center; }
.promo-box h3 { font-family: 'Cinzel', serif; color: var(--gold); margin-bottom: 18px; font-size: 1rem; }
.promo-row { display: flex; gap: 16px; font-size: 3rem; cursor: pointer; justify-content: center; }
.promo-row span { transition: transform .15s; }
.promo-row span:hover { transform: scale(1.2); }

/* ═══ LEARN SCREEN ═══ */
#screenLearn { background: var(--bg2); overflow-y: auto; }
.learn-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; width: 100%; max-width: 680px; padding: 24px; margin: 0 auto; }
.learn-card {
  background: linear-gradient(150deg, var(--panel) 0%, var(--panel2) 100%);
  border: 1px solid var(--bord);
  border-radius: 14px; padding: 22px; cursor: pointer;
  transition: all .25s; text-align: center;
  box-shadow: 0 2px 10px rgba(0,0,0,.2);
}
.learn-card:hover { border-color: var(--teal); transform: translateY(-3px); box-shadow: 0 8px 24px rgba(38,201,180,.1); }
.lc-icon { font-size: 2.4rem; margin-bottom: 10px; }
.lc-title { font-family: 'Cinzel', serif; font-size: .95rem; color: var(--text2); margin-bottom: 6px; font-weight: 600; }
.lc-sub { font-size: .78rem; color: var(--text); line-height: 1.55; }

/* ═══ LESSON SCREEN ═══ */
#screenLesson { background: var(--bg2); overflow: hidden; }
.lesson-layout { flex: 1; display: grid; grid-template-columns: 260px 1fr; overflow: hidden; }
.lesson-left { background: var(--bg2); border-right: 1px solid var(--bord); padding: 18px; display: flex; flex-direction: column; gap: 14px; overflow-y: auto; }
.lesson-right { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 20px; gap: 14px; overflow-y: auto; }
.lesson-step { background: var(--panel); border: 1px solid var(--bord); border-radius: 10px; padding: 14px; cursor: pointer; transition: all .2s; box-shadow: 0 1px 6px rgba(0,0,0,.15); }
.lesson-step.active { border-color: var(--teal); background: rgba(38,201,180,.05); }
.lesson-step-num { font-family: 'Cinzel', serif; font-size: .65rem; color: var(--dim); margin-bottom: 5px; }
.lesson-step-title { font-size: .88rem; color: var(--text2); font-weight: 700; margin-bottom: 5px; }
.lesson-step-text { font-size: .78rem; color: var(--text); line-height: 1.68; }
.lesson-board-label { font-family: 'Cinzel', serif; font-size: .75rem; color: var(--gold); letter-spacing: .12em; text-align: center; }
.lesson-instruction { max-width: 440px; text-align: center; background: rgba(201,168,76,.06); border: 1px solid rgba(201,168,76,.18); border-radius: 10px; padding: 16px 20px; font-size: .85rem; line-height: 1.78; color: var(--text2); }
.lesson-robot-btn {
  display: flex; align-items: center; gap: 8px; padding: 10px 20px;
  background: rgba(240,150,42,.08); border: 1px solid rgba(240,150,42,.35);
  border-radius: 30px; color: var(--orange); font-family: 'Barlow Condensed', sans-serif;
  font-size: .72rem; letter-spacing: .1em; cursor: pointer; transition: all .25s;
}
.lesson-robot-btn:hover { background: rgba(240,150,42,.18); }
.lesson-robot-btn:disabled { opacity: .35; cursor: not-allowed; }
.lesson-nav { display: flex; gap: 10px; width: 100%; max-width: 440px; }

/* ═══ ROBOT CONTROL SCREEN ═══ */
#screenRobot { background: var(--bg2); overflow-y: auto; }
.robot-layout { flex: 1; display: flex; flex-direction: column; padding: 20px 24px; gap: 16px; max-width: 760px; margin: 0 auto; width: 100%; }

.robot-conn-card {
  background: linear-gradient(150deg, var(--panel) 0%, var(--panel2) 100%);
  border: 1px solid var(--bord); border-radius: 14px; padding: 20px;
  box-shadow: 0 2px 10px rgba(0,0,0,.2);
}
.robot-conn-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.robot-conn-title { font-family: 'Cinzel', serif; font-size: .85rem; color: var(--text2); }
.robot-info-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
.ri-cell { background: var(--bg2); border: 1px solid var(--bord); border-radius: 9px; padding: 12px; text-align: center; }
.ri-val { font-family: 'Cinzel', serif; font-size: 1.1rem; color: var(--gold2); margin-bottom: 4px; font-weight: 600; }
.ri-lbl { font-size: .72rem; color: var(--text); letter-spacing: .08em; }

.robot-cmd-card { background: linear-gradient(150deg, var(--panel) 0%, var(--panel2) 100%); border: 1px solid var(--bord); border-radius: 14px; padding: 20px; box-shadow: 0 2px 10px rgba(0,0,0,.2); }
.cmd-title { font-family: 'Cinzel', serif; font-size: .82rem; color: var(--text2); margin-bottom: 14px; }
.cmd-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; margin-bottom: 14px; }
.cmd-btn {
  padding: 11px 8px; background: var(--panel2); border: 1px solid var(--bord2);
  border-radius: 8px; color: var(--text2); font-family: 'Barlow Condensed', sans-serif;
  font-size: .82rem; letter-spacing: .06em; cursor: pointer; transition: all .2s; text-align: center;
}
.cmd-btn:hover { border-color: var(--teal); color: var(--teal); background: rgba(38,201,180,.06); }
.cmd-btn:disabled { opacity: .3; cursor: not-allowed; }

.custom-cmd { display: flex; gap: 8px; }
.cmd-input {
  flex: 1; background: var(--panel2); border: 1px solid var(--bord2); border-radius: 8px;
  padding: 9px 12px; color: var(--text2); font-family: 'Barlow Condensed', sans-serif;
  font-size: .72rem; outline: none; transition: border-color .2s;
}
.cmd-input:focus { border-color: var(--teal); }
.cmd-send {
  padding: 9px 18px; background: rgba(38,201,180,.1); border: 1px solid rgba(38,201,180,.3);
  border-radius: 8px; color: var(--teal); font-family: 'Barlow Condensed', sans-serif;
  font-size: .72rem; cursor: pointer; transition: all .2s;
}
.cmd-send:hover { background: rgba(38,201,180,.2); }

.ble-log {
  background: #1a1610; border: 1px solid var(--bord); border-radius: 8px;
  padding: 10px 12px; font-size: .6rem; height: 160px; overflow-y: auto;
  font-family: 'Barlow Condensed', sans-serif; line-height: 1.9;
  scrollbar-width: thin; scrollbar-color: var(--bord) transparent;
}
.ble-log .tx { color: var(--gold); }
.ble-log .rx { color: var(--teal); }
.ble-log .er { color: var(--red); }
.ble-log .inf { color: var(--dim); }

/* ═══ UTILS ═══ */
::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-thumb { background: var(--bord); border-radius: 2px; }

.divider { height: 1px; background: var(--bord); width: 100%; max-width: 380px; }

.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 9px; border-radius: 12px;
  font-size: .58rem; letter-spacing: .1em;
}
.badge.teal { background: rgba(38,201,180,.1); border: 1px solid rgba(38,201,180,.25); color: var(--teal); }
.badge.gold { background: rgba(201,168,76,.1); border: 1px solid rgba(201,168,76,.25); color: var(--gold2); }

/* ═══ MEDIUM DESKTOP (max 1200px) ═══ */
@media (max-width: 1200px) {
  .game-layout { grid-template-columns: 200px 1fr 240px; }
  .home-menu { max-width: 340px; }
}

/* ═══ TABLET (max 900px) ═══ */
@media (max-width: 900px) {
  .game-layout { grid-template-columns: 1fr; grid-template-rows: auto 1fr auto; }
  .game-left  { border: none; border-bottom: 1px solid var(--bord); flex-direction: row; flex-wrap: wrap; gap: 8px; padding: 10px; max-height: none; }
  .game-right { border: none; border-top: 1px solid var(--bord); flex-direction: row; flex-wrap: wrap; gap: 8px; padding: 10px; }
  .sidebar-section { min-width: 180px; flex: 1; }
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-left { max-height: 220px; flex-direction: row; flex-wrap: wrap; border-right: none; border-bottom: 1px solid var(--bord); }
  .robot-info-grid { grid-template-columns: repeat(3,1fr); }
  .home-logo h1 { font-size: 1.8rem; }
  .home-menu { padding: 0 16px; }
}

/* ═══ MOBILE (max 600px) ═══ */
@media (max-width: 600px) {

  /* ── GAME SCREEN: scacchiera fullscreen + bottom sheet ── */
  #screenGame { overflow: hidden; position: relative; }

  .game-layout {
    display: flex !important;
    flex-direction: column !important;
    width: 100%;
    height: calc(100vh - 52px);
    overflow: hidden;
    grid-template-columns: unset !important;
  }

  /* Nascondi sidebar — contenuto nel bottom sheet */
  .game-left  { display: none !important; }
  .game-right { display: none !important; }

  /* Centro: solo scacchiera, occupa tutto */
  .game-center {
    flex: 1 1 auto !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: flex-start !important;
    padding: 8px 4px 116px !important; /* 116px = altezza bottom bar */
    overflow-y: auto;
    gap: 6px;
    order: 1;
  }

  /* ── BOTTOM BAR: sempre visibile ── */
  .mobile-bottom-bar {
    display: flex !important;
    flex-direction: column;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    z-index: 200;
    background: var(--bg);
    border-top: 1px solid var(--bord2);
  }
  .mini-pbar { padding: 7px 14px; }
  .mini-pname { font-size: .8rem; }
  .mini-ptimer { font-size: 1.05rem; }
  .sheet-toggle { display: flex !important; font-size: .72rem; padding: 7px 14px; }

  /* ── BOTTOM SHEET ── */
  .mobile-sheet {
    display: block !important;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    z-index: 300;
    background: var(--panel);
    border-radius: 18px 18px 0 0;
    border-top: 2px solid var(--bord2);
    transform: translateY(100%);
    transition: transform .32s cubic-bezier(.4,0,.2,1);
    max-height: 72vh;
    overflow: hidden;
  }
  .mobile-sheet.open { transform: translateY(0); }
  .sheet-handle {
    display: flex !important;
    justify-content: center;
    padding: 10px 0 5px;
    cursor: pointer;
  }
  .sheet-handle-bar { width: 40px; height: 4px; background: var(--bord2); border-radius: 2px; }
  .sheet-tabs {
    display: flex !important;
    border-bottom: 1px solid var(--bord);
    margin-bottom: 0;
  }
  .sheet-tab {
    flex: 1; padding: 9px 4px; text-align: center;
    font-size: .75rem; color: var(--dim); cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all .2s;
    font-family: 'Barlow Condensed', sans-serif;
    letter-spacing: .04em;
  }
  .sheet-tab.active { color: var(--gold2); border-bottom-color: var(--gold2); }
  .sheet-panel { display: none; }
  .sheet-panel.active { display: block; }
  .sheet-content { overflow-y: auto; max-height: calc(72vh - 88px); padding: 12px 14px 20px; }
  .stat-grid2 { gap: 6px; }
  .sg-cell { padding: 8px 10px; }

  /* ── Header ── */
  .app-header { padding: 8px 12px; gap: 5px; }
  .header-title { font-size: .72rem; letter-spacing: .06em; }
  .app-header .back-btn { font-size: .7rem; }
  .ble-status { font-size: .62rem; padding: 4px 8px; }

  /* ── Home ── */
  .home-logo h1 { font-size: 1.5rem; }
  .home-logo .logo-icon { font-size: 3rem; }
  .home-logo p { font-size: .65rem; }
  .home-menu { gap: 10px; padding: 0 12px; }
  .menu-card { padding: 14px 12px; gap: 10px; border-radius: 12px; }
  .menu-icon { font-size: 1.5rem; }
  .menu-text h2 { font-size: .88rem; }
  .menu-text p { font-size: .7rem; }
  #langBar { gap: 4px; }
  .lang-btn { font-size: .7rem !important; padding: 5px 8px !important; }

  /* ── Setup ── */
  .setup-title { font-size: 1.05rem; }
  .setup-sub { font-size: .75rem; margin-bottom: 20px; }
  .level-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .level-card { padding: 14px 10px; }
  .level-card .lv-icon { font-size: 1.4rem; margin-bottom: 4px; }
  .level-card .lv-name { font-size: .82rem; }
  .level-card .lv-elo { font-size: .65rem; }
  .color-row { gap: 10px; }
  .cpick { padding: 18px 10px; }
  .cpick .cp-piece-wrap { width: 70px; height: 70px; }
  .cpick .cp-label { font-size: .78rem; }
  .time-row { gap: 6px; }
  .time-card { padding: 13px 6px; }
  .btn-primary { padding: 13px; font-size: .82rem; }

  /* ── Game status ── */
  .verify-btn { padding: 7px 14px; font-size: .72rem; }
  .game-status { font-size: .7rem; padding: 7px 10px; }

  /* ── Learn ── */
  .learn-grid { grid-template-columns: 1fr 1fr; gap: 10px; padding: 14px; }
  .lc-icon { font-size: 1.8rem; margin-bottom: 7px; }
  .lc-title { font-size: .82rem; }
  .lc-sub { font-size: .66rem; }
  .lesson-layout { grid-template-columns: 1fr; overflow-y: auto; }
  .lesson-left { max-height: 180px; padding: 10px; }
  .lesson-step { padding: 10px; }
  .lesson-step-title { font-size: .76rem; }
  .lesson-step-text { font-size: .66rem; }
  .lesson-right { padding: 12px 10px; }
  .lesson-instruction { font-size: .74rem; padding: 12px 14px; }

  /* ── Robot control ── */
  .robot-layout { padding: 12px 14px; gap: 12px; }
  .robot-info-grid { grid-template-columns: repeat(2,1fr); gap: 8px; }
  .ri-val { font-size: .9rem; }
  .ri-lbl { font-size: .62rem; }
  .cmd-grid { grid-template-columns: repeat(2,1fr); gap: 6px; }
  .cmd-btn { font-size: .72rem; padding: 10px 6px; }
  .ble-log { height: 130px; }

  /* ── Game over ── */
  .gameover-box { padding: 28px 20px; }
  .go-title { font-size: 1.25rem; }
  .go-sub { font-size: .72rem; }
  .go-stats { gap: 8px; }
  .go-stat-val { font-size: 1.1rem; }
  .go-stat-lbl { font-size: .62rem; }
  .go-btn { font-size: .72rem; padding: 11px; }
}

/* ═══ SMALL MOBILE (max 400px) ═══ */
@media (max-width: 400px) {
  .home-logo h1 { font-size: 1.25rem; }
  .level-grid { grid-template-columns: 1fr 1fr; }
  .learn-grid { grid-template-columns: 1fr; }
  .go-stats { grid-template-columns: 1fr 1fr 1fr; }
  .lang-btn { font-size: .62rem !important; padding: 4px 6px !important; }
}

/* ── Stat grid 2 col ── */
.stat-grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-top:4px; }
.sg-cell { background: var(--bg2); border: 1px solid var(--bord); border-radius: 8px; padding: 9px 11px; }
.sg-lbl { font-size: .66rem; color: var(--text); margin-bottom: 3px; line-height:1.3; }
.sg-val { font-family: 'Cinzel', serif; font-size: 1.1rem; color: var(--gold2); font-weight: 700; }

/* Lang bar — responsive at all sizes */
#langBar {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 5px;
  overflow: hidden;
}
.lang-btn {
  white-space: nowrap;
  flex-shrink: 0;
}

/* Mobile-only elements: hidden on desktop */
.mobile-bottom-bar { display: none; }
.mobile-sheet { display: none; }
.sheet-handle { display: none; }
.sheet-tabs { display: none; }

/* Mini pbar for mobile bottom bar */
.mini-pbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 14px;
  background: var(--panel2);
  border-bottom: 1px solid var(--bord);
}
.mini-pbar:last-child { border-bottom: none; }
.mini-pname { font-family: 'Cinzel', serif; font-size: .78rem; color: var(--text2); }
.mini-ptimer { font-size: 1rem; font-weight: 700; color: var(--gold2); font-variant-numeric: tabular-nums; }
.mini-pbar.active { background: rgba(201,168,76,.08); }
.mini-pbar.robot-active { background: rgba(42,184,166,.06); }
/* Sheet toggle button */
.sheet-toggle {
  display: none;
  align-items: center; justify-content: center;
  gap: 6px;
  padding: 7px 14px;
  background: var(--bg2);
  border: none;
  color: var(--text);
  font-family: 'Barlow Condensed', sans-serif;
  font-size: .75rem; letter-spacing: .08em;
  cursor: pointer; width: 100%;
  border-top: 1px solid var(--bord);
}
@media (max-width: 600px) {
  .sheet-toggle { display: flex; }
}

/* ── Browser not supported overlay ── */
.browser-warn-ov {
  position: fixed; inset: 0;
  background: var(--bg);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  z-index: 9999; padding: 32px 24px; text-align: center;
}
.browser-warn-box {
  background: var(--panel);
  border: 1px solid var(--bord2);
  border-radius: 20px;
  padding: 40px 32px;
  max-width: 440px; width: 100%;
  box-shadow: 0 8px 40px rgba(0,0,0,.5);
}
.browser-warn-icon { font-size: 3.5rem; margin-bottom: 16px; }
.browser-warn-title {
  font-family: 'Cinzel', serif; font-size: 1.2rem; font-weight: 700;
  color: var(--gold2); margin-bottom: 12px;
}
.browser-warn-text {
  font-size: .85rem; color: var(--text); line-height: 1.8; margin-bottom: 24px;
}
.browser-warn-btns { display: flex; flex-direction: column; gap: 10px; }
.browser-btn-chrome {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 13px 20px; border-radius: 10px;
  background: linear-gradient(135deg, #1a73e8, #1557b0);
  border: none; color: #fff;
  font-family: 'Barlow Condensed', sans-serif;
  font-size: .88rem; font-weight: 600; letter-spacing: .06em;
  cursor: pointer; text-decoration: none; transition: opacity .2s;
}
.browser-btn-chrome:hover { opacity: .85; }
.browser-btn-edge {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 13px 20px; border-radius: 10px;
  background: linear-gradient(135deg, #0078d4, #005fa3);
  border: none; color: #fff;
  font-family: 'Barlow Condensed', sans-serif;
  font-size: .88rem; font-weight: 600; letter-spacing: .06em;
  cursor: pointer; text-decoration: none; transition: opacity .2s;
}
.browser-btn-edge:hover { opacity: .85; }
.browser-btn-continue {
  padding: 10px; border-radius: 10px;
  background: transparent; border: 1px solid var(--bord2);
  color: var(--dim); font-family: 'Barlow Condensed', sans-serif;
  font-size: .75rem; cursor: pointer; transition: all .2s;
}
.browser-btn-continue:hover { border-color: var(--teal); color: var(--teal); }