/* Chess Arena — light theme */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f2f0ea; --panel: #ffffff; --panel2: #e9e6df;
  --text: #2b2a27; --muted: #85817a; --green: #7fa650; --green-dark: #6d8f44;
  --sq-light: #eeeed2; --sq-dark: #769656;
  --danger: #c94f4f;
}
body { background: var(--bg); color: var(--text); font-family: -apple-system, 'Segoe UI', Roboto, sans-serif; display: flex; min-height: 100vh; }
a { color: var(--green-dark); }

/* sidebar */
.sidebar { width: 200px; background: var(--panel); padding: 16px 0; flex-shrink: 0; display: flex; flex-direction: column; gap: 2px; position: sticky; top: 0; height: 100vh; border-right: 1px solid #dedad2; }
.logo { font-size: 22px; font-weight: 800; padding: 8px 20px 18px; letter-spacing: .5px; }
.logo span { color: var(--green); }
.nav-item { background: none; border: none; color: var(--text); text-align: left; padding: 11px 20px; font-size: 15px; cursor: pointer; border-left: 3px solid transparent; }
.nav-item:hover { background: var(--panel2); }
.nav-item.active { border-left-color: var(--green); background: var(--panel2); font-weight: 700; }

/* layout */
.content { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar { display: flex; justify-content: flex-end; padding: 10px 24px; background: var(--panel); border-bottom: 1px solid #dedad2; }
#user-chip { display: flex; align-items: center; gap: 8px; font-size: 14px; }
#main { padding: 24px; max-width: 1100px; width: 100%; margin: 0 auto; }
h2 { margin-bottom: 12px; } h3 { margin: 14px 0 8px; }
.muted { color: var(--muted); } .center { text-align: center; }

/* hero + cards */
.hero { text-align: center; padding: 28px 0 18px; }
.hero h1 { font-size: 40px; } .hero p { color: var(--muted); margin-top: 6px; }
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; margin: 18px 0; }
.card { background: var(--panel); border-radius: 10px; padding: 18px; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.card.go { cursor: pointer; transition: transform .1s; }
.card.go:hover { transform: translateY(-3px); background: var(--panel2); }
.card-icon { font-size: 30px; }
.card p { color: var(--muted); font-size: 14px; margin-top: 4px; }

.stat-row, .acc-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 14px 0; }
.stat { background: var(--panel); border-radius: 8px; padding: 10px 18px; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.stat b { font-size: 22px; display: block; } .stat span { color: var(--muted); font-size: 12px; }

/* buttons + inputs */
.btn { background: var(--panel2); color: var(--text); border: none; border-radius: 6px; padding: 9px 16px; font-size: 14px; cursor: pointer; }
.btn:hover { filter: brightness(1.15); }
.btn.primary { background: var(--green); color: #fff; font-weight: 700; }
.btn.danger { background: var(--danger); color: #fff; }
.btn.tiny { padding: 2px 8px; font-size: 11px; }
.btn-row { display: flex; gap: 10px; margin: 12px 0; flex-wrap: wrap; align-items: center; }
.radio { display: flex; align-items: center; gap: 6px; }
input[type=text], input:not([type]), textarea, select { background: var(--panel); color: var(--text); border: 1px solid #d5d1c8; border-radius: 6px; padding: 10px; width: 100%; font-size: 14px; margin: 6px 0; font-family: inherit; }
label { font-size: 14px; }

/* bots */
.bot-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 10px; }
.bot-card { background: var(--panel); border: 2px solid transparent; border-radius: 10px; padding: 14px 8px; color: var(--text); cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 6px; }
.bot-card:hover { border-color: var(--green); }
.avatar { font-size: 18px; } .avatar.big { font-size: 34px; }
.elo-chip { background: var(--panel2); border-radius: 10px; padding: 1px 8px; font-size: 12px; color: var(--muted); }
.title-tag { color: #a6791b; }

/* board */
.board-wrap { width: min(560px, 92vw); }
.board-wrap.small { width: min(400px, 92vw); }
.board { display: grid; grid-template-columns: repeat(8, 1fr); grid-template-rows: repeat(8, 1fr); aspect-ratio: 1; border-radius: 6px; overflow: hidden; user-select: none; position: relative; }
.sq { position: relative; display: flex; align-items: center; justify-content: center; cursor: pointer; overflow: hidden; }
.sq.light { background: var(--sq-light); } .sq.dark { background: var(--sq-dark); }
.sq.sel { box-shadow: inset 0 0 0 4px rgba(255, 255, 0, .55); }
.sq.last { background-image: linear-gradient(rgba(255,255,0,.28), rgba(255,255,0,.28)); }
.sq.capture-hint { box-shadow: inset 0 0 0 4px rgba(0,0,0,.25); border-radius: 50%; }
.piece { font-size: min(7.2vw, 44px); line-height: 1; cursor: grab; z-index: 1; }
.white-piece { color: #fff; text-shadow: 0 1px 2px rgba(0,0,0,.7); }
.black-piece { color: #1c1a18; text-shadow: 0 1px 1px rgba(255,255,255,.25); }
.dot { position: absolute; width: 26%; height: 26%; border-radius: 50%; background: rgba(0,0,0,.22); }
.coord { position: absolute; font-size: 10px; font-weight: 700; opacity: .8; }
.coord.rank { top: 2px; left: 3px; } .coord.file { bottom: 2px; right: 3px; }
.sq.light .coord { color: var(--sq-dark); } .sq.dark .coord { color: var(--sq-light); }
.promo-overlay { position: absolute; inset: 0; background: rgba(0,0,0,.55); display: flex; align-items: center; justify-content: center; z-index: 5; }
.promo-box { background: var(--panel); border-radius: 10px; padding: 12px; display: flex; gap: 8px; }
.promo-btn { font-size: 38px; background: var(--panel2); border: none; border-radius: 8px; cursor: pointer; padding: 6px 12px; }
.promo-btn:hover { background: var(--green); }

/* game layout */
.game-layout { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 10px; }
.side-panel { flex: 1; min-width: 240px; background: var(--panel); border-radius: 10px; padding: 14px; align-self: flex-start; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.opp-bar, .you-bar { display: flex; align-items: center; gap: 8px; padding: 8px 2px; font-weight: 600; }
.arena-header { background: var(--panel); border-radius: 8px; padding: 8px 14px; margin-bottom: 8px; font-weight: 700; }
.movelist { max-height: 300px; overflow-y: auto; font-size: 14px; }
.movelist.tall { max-height: 420px; }
.mv-row { display: grid; grid-template-columns: 34px 1fr 1fr; padding: 3px 6px; }
.mv-row:nth-child(odd) { background: rgba(0,0,0,.05); }
.mv-num { color: var(--muted); }
.game-msg { margin-top: 10px; font-size: 15px; }
.endcard { background: var(--panel2); border-radius: 8px; padding: 12px; display: flex; flex-direction: column; gap: 8px; margin-top: 8px; }

/* review */
.progress { background: var(--panel); border-radius: 6px; height: 14px; overflow: hidden; margin: 12px 0; }
.bar { background: var(--green); height: 100%; width: 0; transition: width .2s; }
.eval-graph { width: 100%; height: 90px; border-radius: 8px; margin: 10px 0; }
.rv-mv { display: block; width: 100%; text-align: left; background: none; border: none; color: var(--text); padding: 4px 8px; cursor: pointer; font-size: 14px; border-radius: 4px; }
.rv-mv:hover, .rv-mv.active { background: var(--panel2); }
.rv-mv small { float: right; color: var(--muted); }
.cl-best { color: #4e7d1e; } .cl-exc { color: #6f9a3c; } .cl-good { color: #7e825e; }
.cl-inacc { color: #b98f10; } .cl-mist { color: #c46f1d; } .cl-blun { color: #cc3b3b; font-weight: 700; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 760px) { .two-col { grid-template-columns: 1fr; } .sidebar { width: 60px; } .logo, .nav-label { display: none; } }
.gamelist { display: flex; flex-direction: column; gap: 6px; max-height: 320px; overflow-y: auto; }
.game-row { background: var(--panel); border: none; color: var(--text); text-align: left; border-radius: 6px; padding: 10px; cursor: pointer; font-size: 13px; }
.game-row:hover { background: var(--panel2); }

/* lessons */
.lesson-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; margin-bottom: 16px; }
.lesson-card { background: var(--panel); border: 2px solid transparent; border-radius: 10px; padding: 14px; color: var(--text); cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 6px; position: relative; }
.lesson-card:hover { border-color: var(--green); }
.lesson-card .done { position: absolute; top: 6px; right: 8px; color: var(--green); font-weight: 800; }
.lesson-view { background: var(--panel); border-radius: 10px; padding: 18px; }
.lesson-view p { margin: 8px 0; line-height: 1.5; }

/* blog */
.blog-editor { background: var(--panel); border-radius: 10px; padding: 14px; margin-bottom: 18px; }
.post { background: var(--panel); border-radius: 10px; padding: 16px; margin-bottom: 14px; }
.post p { margin: 6px 0; line-height: 1.5; }

/* profile */
.avatar-row { display: flex; gap: 6px; flex-wrap: wrap; margin: 10px 0; }
.avatar-pick { font-size: 24px; background: var(--panel); border: 2px solid transparent; border-radius: 8px; padding: 6px 10px; cursor: pointer; }
.avatar-pick.sel { border-color: var(--green); }
.userline { display: block; width: 100%; text-align: left; margin: 4px 0; }
.setup { background: var(--panel); border-radius: 10px; padding: 16px; }