/* ===== XADREZPT — GLOBAL CSS ===== */
@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Space+Grotesk:wght@500;600;700&display=swap');

*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{background:#0a0a0a;color:#fff;font-family:'Manrope',-apple-system,sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden;}
::selection{background:#fff;color:#0a0a0a;}

/* VARIABLES */
:root{
  --accent:#4ade80;
  --bg:#0a0a0a;
  --bg2:#080808;
  --bg3:#0b0b0b;
  --bg4:#0c0c0c;
  --border:#161616;
  --border2:#1a1a1a;
  --border3:#222;
  --border4:#262626;
  --text:#fff;
  --text2:#cfcfcf;
  --text3:#9a9a9a;
  --text4:#888;
  --text5:#666;
  --text6:#555;
  --font-head:'Space Grotesk',sans-serif;
  --font-body:'Manrope',sans-serif;
}

/* ANIMATIONS */
@keyframes fadeUp{from{opacity:0;transform:translateY(18px);}to{opacity:1;transform:translateY(0);}}
@keyframes popIn{from{opacity:0;transform:scale(.85) translateY(20px);}to{opacity:1;transform:scale(1) translateY(0);}}
@keyframes draw{to{stroke-dashoffset:0;}}
@keyframes fall{0%{transform:translateY(-12vh) rotate(0deg);opacity:0;}10%{opacity:1;}100%{transform:translateY(112vh) rotate(420deg);opacity:.95;}}
@keyframes flashIn{from{opacity:0;}to{opacity:1;}}
@keyframes slideIn{from{opacity:0;transform:translateY(14px) scale(.98);}to{opacity:1;transform:translateY(0) scale(1);}}
@keyframes pulseRing{0%,100%{opacity:.2;transform:scale(.82);}50%{opacity:.85;transform:scale(1.04);}}
@keyframes floatBoard{0%,100%{transform:translateY(0);}50%{transform:translateY(-12px);}}
@keyframes spin{to{transform:rotate(360deg);}}

/* NAVBAR */
.xpt-nav{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:18px 32px;
  background:rgba(10,10,10,.85);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
}
.xpt-nav-logo{display:flex;align-items:center;gap:11px;cursor:pointer;text-decoration:none;}
.xpt-nav-logo img{width:44px;height:44px;object-fit:contain;}
.xpt-nav-logo span{font-family:var(--font-head);font-weight:700;font-size:18px;letter-spacing:-.02em;color:#fff;}
.xpt-nav-links{display:flex;align-items:center;gap:4px;}
.xpt-nav-links a{background:none;border:none;padding:8px 14px;font-family:var(--font-body);font-weight:600;font-size:14.5px;cursor:pointer;text-decoration:none;color:var(--text4);transition:color .2s;}
.xpt-nav-links a:hover{color:#ccc;}
.xpt-nav-links a.active{color:#fff;}
.xpt-nav-burger{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:none;padding:4px;}
.xpt-nav-burger span{display:block;width:22px;height:2px;background:#fff;border-radius:2px;transition:all .3s;}

/* FOOTER */
.xpt-footer{border-top:1px solid var(--border);padding:48px 32px;margin-top:0;}
.xpt-footer-inner{max-width:1240px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:24px;}
.xpt-footer-logo{display:flex;align-items:center;gap:10px;text-decoration:none;}
.xpt-footer-logo img{width:36px;height:36px;object-fit:contain;}
.xpt-footer-logo span{font-family:var(--font-head);font-weight:700;font-size:16px;color:#fff;}
.xpt-footer-links{display:flex;gap:24px;flex-wrap:wrap;}
.xpt-footer-links a{font-size:14px;color:var(--text4);text-decoration:none;transition:color .2s;}
.xpt-footer-links a:hover{color:#fff;}
.xpt-footer-copy{font-size:13px;color:var(--text5);}

/* CHESS BOARD */
.xpt-board-wrap{position:relative;}
.xpt-board{display:grid;grid-template-columns:auto repeat(8,1fr);grid-template-rows:repeat(8,1fr) auto;border:1px solid #333;border-radius:6px;overflow:hidden;user-select:none;}
.xpt-board-coords-col{display:grid;grid-template-rows:repeat(8,1fr);}
.xpt-coord-row{display:flex;align-items:center;justify-content:center;font-size:10px;color:var(--text5);width:18px;font-family:var(--font-body);}
.xpt-coord-col{display:flex;align-items:center;justify-content:center;font-size:10px;color:var(--text5);height:18px;font-family:var(--font-body);}
.xpt-sq{display:flex;align-items:center;justify-content:center;position:relative;cursor:pointer;}
.xpt-sq.light{background:#f0d9b5;}
.xpt-sq.dark{background:#b58863;}
.xpt-sq.selected{background:#829769!important;}
.xpt-sq.hint-ring::after{content:'';position:absolute;inset:10%;border:3px solid var(--accent);border-radius:50%;pointer-events:none;}
.xpt-sq.last-from{background:rgba(246,246,105,.45)!important;}
.xpt-sq.last-to{background:rgba(246,246,105,.45)!important;}
.xpt-sq img{width:85%;height:85%;object-fit:contain;pointer-events:none;transition:transform .1s;}
.xpt-sq.dragging img{opacity:.5;}
.xpt-drag-ghost{position:fixed;pointer-events:none;z-index:9999;transform:translate(-50%,-50%);width:60px;height:60px;}
.xpt-drag-ghost img{width:100%;height:100%;object-fit:contain;filter:drop-shadow(0 4px 12px rgba(0,0,0,.5));}

/* BUTTONS */
.btn-primary{padding:14px 26px;background:#fff;color:#0a0a0a;border:none;border-radius:9px;font-family:var(--font-body);font-weight:700;font-size:15px;cursor:pointer;transition:background .2s;}
.btn-primary:hover{background:#e4e4e4;}
.btn-secondary{padding:14px 26px;background:transparent;color:#fff;border:1px solid var(--border4);border-radius:9px;font-family:var(--font-body);font-weight:600;font-size:15px;cursor:pointer;transition:border-color .2s;}
.btn-secondary:hover{border-color:#4a4a4a;}
.btn-ghost{background:none;border:none;color:var(--text4);font-family:var(--font-body);font-weight:600;font-size:14px;cursor:pointer;transition:color .2s;padding:0;}
.btn-ghost:hover{color:#fff;}

/* OVERLAY — PUZZLE SOLVED */
.xpt-overlay{position:fixed;inset:0;z-index:100;background:rgba(6,6,6,.92);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;overflow:hidden;animation:flashIn .3s ease;}
.xpt-overlay-inner{position:relative;z-index:1;text-align:center;max-width:480px;padding:0 28px;}
.xpt-overlay-close{position:absolute;top:26px;right:30px;width:42px;height:42px;border-radius:50%;background:#141414;border:1px solid var(--border4);color:#fff;font-size:20px;cursor:pointer;z-index:2;transition:background .2s;}
.xpt-overlay-close:hover{background:#1d1d1d;}
.xpt-overlay h2{font-family:var(--font-head);font-weight:700;font-size:42px;letter-spacing:-.03em;margin:0 0 12px;}
.xpt-overlay p{color:var(--text3);font-size:17px;margin:0 0 6px;}
.xpt-overlay-sub{color:var(--text5);font-size:15px;margin:0 0 32px;}
.xpt-overlay-btns{display:flex;gap:13px;justify-content:center;flex-wrap:wrap;}

/* WRONG FLASH */
.xpt-wrong-flash{position:absolute;inset:0;border-radius:10px;background:rgba(120,20,20,.82);backdrop-filter:blur(2px);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:28px;cursor:pointer;animation:flashIn .2s ease both;z-index:10;}
.xpt-wrong-flash h3{font-family:var(--font-head);font-weight:700;font-size:24px;margin-bottom:10px;}
.xpt-wrong-flash p{font-size:14.5px;color:#ffd9d9;line-height:1.5;max-width:300px;}

/* CONCEPT PANEL */
.xpt-concept{border:1px solid var(--border3);border-radius:14px;padding:28px;background:var(--bg4);margin-top:6px;}
.xpt-concept-label{font-size:12px;color:var(--text5);letter-spacing:.1em;text-transform:uppercase;margin-bottom:10px;}
.xpt-concept-name{font-family:var(--font-head);font-weight:700;font-size:26px;letter-spacing:-.02em;color:var(--accent);margin-bottom:14px;}
.xpt-concept-text{font-size:15.5px;line-height:1.65;color:#bdbdbd;margin:0 0 20px;}
.xpt-concept-link{display:inline-flex;align-items:center;gap:8px;background:none;border:none;padding:0;color:#fff;font-weight:600;font-size:14.5px;cursor:pointer;transition:opacity .2s;}
.xpt-concept-link:hover{opacity:.7;}

/* RESPONSIVE */
@media(max-width:768px){
  .xpt-nav{padding:14px 20px;}
  .xpt-nav-links{display:none;}
  .xpt-nav-burger{display:flex;}
  .xpt-nav-links.open{display:flex;flex-direction:column;position:fixed;inset:0;top:65px;background:#0a0a0a;padding:32px 24px;gap:8px;z-index:49;}
  .xpt-nav-links.open a{font-size:20px;padding:14px 0;border-bottom:1px solid var(--border);}
  .xpt-footer-inner{flex-direction:column;align-items:flex-start;}
}

/* ===== LOGO TEXT ONLY ===== */
.xpt-nav-logo img { display: none; }
.xpt-nav-logo span { 
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -.02em;
  color: #fff;
}
.xpt-footer-logo img { display: none; }
.xpt-footer-logo span {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  color: #fff;
}