:root{
  --bg:#06101b;--panel:#0d1928;--panel2:#102238;--line:rgba(255,255,255,.08);
  --text:#f7fbff;--muted:#93a7bf;--accent:#67f3c1;--accent2:#5eb6ff;--gold:#ffd166;--danger:#ff6477;
  --sq-light:#e9f3ef;--sq-dark:#49796f;--shadow:0 24px 70px rgba(0,0,0,.38);
}
*{box-sizing:border-box}html{min-height:100%;background:var(--bg)}body{margin:0;min-height:100vh;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--text);background:radial-gradient(circle at 10% 0%,rgba(94,182,255,.16),transparent 30%),radial-gradient(circle at 90% 15%,rgba(103,243,193,.12),transparent 24%),linear-gradient(180deg,#07111e,#04080f 80%);overflow-x:hidden}button{font:inherit;color:inherit}.card{background:linear-gradient(180deg,rgba(16,34,56,.92),rgba(9,20,34,.96));border:1px solid var(--line);box-shadow:var(--shadow);border-radius:24px;backdrop-filter:blur(18px)}
.splash{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:20px;background:radial-gradient(circle at 50% 12%,rgba(95,185,255,.2),transparent 32%),#050b13;transition:.55s ease}.splash.hidden{opacity:0;visibility:hidden;transform:scale(1.03)}.splash-card{position:relative;z-index:2;text-align:center;width:min(560px,100%);padding:45px 34px}.splash-logo{width:92px;height:92px;margin:0 auto 22px;border-radius:28px;display:grid;place-items:center;font-size:55px;color:#06121a;background:linear-gradient(145deg,var(--accent),var(--accent2));box-shadow:0 22px 60px rgba(94,182,255,.25);transform:rotate(-3deg)}.eyebrow,.label{font-size:11px;letter-spacing:.17em;color:var(--accent);font-weight:900}.splash h1{font-size:clamp(45px,9vw,78px);line-height:.92;letter-spacing:-.05em;margin:10px 0 20px}.splash h1 span{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}.splash p{font-size:18px;color:#b7c6d8;line-height:1.6}.splash-chips{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin:26px 0}.splash-chips span{font-size:12px;padding:8px 11px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.04);color:#c8d5e3}.splash small{display:block;margin-top:14px;color:#6f8299}.splash-glow{position:absolute;border-radius:50%;filter:blur(60px);opacity:.3}.glow-one{width:280px;height:280px;background:var(--accent2);left:-80px;bottom:-80px}.glow-two{width:260px;height:260px;background:var(--accent);right:-80px;top:-40px}
.app-shell{max-width:1240px;margin:0 auto;padding:22px 18px 18px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;margin-bottom:18px}.brand{display:flex;align-items:center;gap:11px;background:none;border:0;padding:0;cursor:pointer;text-align:left}.brand .logo{width:43px;height:43px;border-radius:13px;display:grid;place-items:center;font-size:25px;background:linear-gradient(145deg,var(--accent),var(--accent2));color:#07131c}.brand b{display:block;font-size:15px}.brand small{font-size:9px;letter-spacing:.18em;color:var(--accent);font-weight:900}.top-actions{display:flex;align-items:center;gap:8px}.metric{display:grid;grid-template-columns:auto auto;grid-template-rows:1fr 1fr;column-gap:6px;align-items:center;border:1px solid var(--line);background:rgba(255,255,255,.035);border-radius:13px;padding:6px 10px}.metric>span{grid-row:1/-1;font-size:18px}.metric b{font-size:14px}.metric small{font-size:9px;color:var(--muted)}.icon-btn{width:40px;height:40px;border:1px solid var(--line);border-radius:12px;background:rgba(255,255,255,.045);cursor:pointer;transition:.2s}.icon-btn:hover{background:rgba(255,255,255,.09);transform:translateY(-1px)}
.game-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(320px,.65fr);gap:18px}.board-card{padding:18px}.board-head,.board-footer,.today-row,.calendar-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.board-head{margin-bottom:14px}.puzzle-meta{display:flex;align-items:center;gap:7px;flex-wrap:wrap}.pill{font-size:11px;font-weight:900;padding:6px 9px;border-radius:999px;background:rgba(103,243,193,.11);color:var(--accent);border:1px solid rgba(103,243,193,.18)}.pill.ghost{background:rgba(94,182,255,.09);color:#a9d7ff;border-color:rgba(94,182,255,.16)}.side-to-move{font-size:13px;color:var(--muted);margin-left:3px}.board-frame{max-width:720px;margin:0 auto;padding:9px;border-radius:22px;background:linear-gradient(145deg,rgba(255,255,255,.08),rgba(255,255,255,.018));border:1px solid var(--line)}.board{width:100%;aspect-ratio:1;display:grid;grid-template-columns:repeat(8,1fr);overflow:hidden;border-radius:14px;user-select:none;touch-action:manipulation;box-shadow:0 20px 44px rgba(0,0,0,.34)}.square{position:relative;display:grid;place-items:center;font-size:clamp(32px,6vw,61px);cursor:pointer}.square.light{background:var(--sq-light)}.square.dark{background:var(--sq-dark)}.square:hover::before{content:"";position:absolute;inset:0;background:rgba(255,255,255,.07)}.square.selected::after{content:"";position:absolute;inset:8%;border:4px solid var(--gold);border-radius:14px;box-shadow:0 0 24px rgba(255,209,102,.35)}.square.hint::after{content:"";position:absolute;width:25%;aspect-ratio:1;border-radius:50%;background:var(--gold);box-shadow:0 0 0 9px rgba(255,209,102,.2);animation:hintPulse 1s infinite}.square.correct{animation:correctPulse .65s ease}.square.correct::before{content:"";position:absolute;inset:0;background:rgba(103,243,193,.5)}.square.wrong{animation:shake .35s ease}.square.wrong::before{content:"";position:absolute;inset:0;background:rgba(255,100,119,.55)}.piece{z-index:2;filter:drop-shadow(0 3px 2px rgba(0,0,0,.25));transition:transform .15s}.square:hover .piece{transform:scale(1.04)}.white-piece{color:#fff;text-shadow:0 1px 0 #173047,0 0 2px #173047}.black-piece{color:#121923;text-shadow:0 1px 0 rgba(255,255,255,.15)}.coord{position:absolute;font-size:10px;font-weight:900;opacity:.62;z-index:1}.file{right:5px;bottom:3px}.rank{left:5px;top:3px}.light .coord{color:#31564f}.dark .coord{color:#eaf4ef}.board-footer{margin-top:14px}.status{font-weight:850;font-size:15px}.board-footer small{color:var(--muted)}.attempt-box{text-align:center;min-width:74px;border:1px solid var(--line);background:rgba(255,255,255,.035);border-radius:14px;padding:7px 10px}.attempt-box small{display:block;font-size:9px;text-transform:uppercase;letter-spacing:.1em}.attempt-box strong{font-size:19px}
.panel{padding:24px;display:flex;flex-direction:column;gap:19px}.date-label{font-size:11px;color:var(--muted)}.panel h2{font-size:31px;letter-spacing:-.03em;margin:0}.panel>p{margin:-10px 0 0;color:var(--muted);line-height:1.6}.progress-label{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;margin-bottom:8px}.progress-track{height:9px;background:rgba(255,255,255,.07);border-radius:999px;overflow:hidden}.progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:inherit;transition:.45s}.actions{display:grid;grid-template-columns:1fr 1fr;gap:9px}.btn{border:0;border-radius:14px;padding:13px 14px;font-weight:850;cursor:pointer;transition:.2s transform,.2s opacity,.2s background}.btn:active{transform:scale(.98)}.btn.primary{grid-column:1/-1;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#06131b;box-shadow:0 12px 28px rgba(94,182,255,.12)}.btn.primary.xl{font-size:16px;padding:16px 22px;min-width:260px}.btn.secondary{background:rgba(255,255,255,.055);border:1px solid var(--line)}.btn.share{grid-column:1/-1;background:rgba(94,182,255,.08);color:#bfe3ff;border:1px solid rgba(94,182,255,.16)}.btn:disabled{opacity:.35;cursor:not-allowed}.stats-card{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.stats-card div{padding:12px 7px;text-align:center;border:1px solid var(--line);background:rgba(255,255,255,.03);border-radius:14px}.stats-card strong{font-size:19px;display:block}.stats-card span{font-size:10px;color:var(--muted)}.calendar-wrap{border-top:1px solid var(--line);padding-top:16px}.calendar-head{font-size:12px;margin-bottom:10px}.calendar-head span{color:var(--muted)}.streak-calendar{display:grid;grid-template-columns:repeat(7,1fr);gap:6px}.day-dot{text-align:center}.day-dot b{display:grid;place-items:center;width:31px;height:31px;margin:0 auto 5px;border-radius:10px;background:rgba(255,255,255,.035);border:1px solid var(--line);font-size:11px}.day-dot.done b{background:linear-gradient(145deg,rgba(103,243,193,.28),rgba(94,182,255,.2));border-color:rgba(103,243,193,.32);color:var(--accent)}.day-dot.today b{box-shadow:0 0 0 2px var(--gold)}.day-dot span{font-size:8px;color:var(--muted);text-transform:uppercase}.tips{display:flex;flex-direction:column;gap:5px;padding:13px 14px;border-radius:14px;background:rgba(94,182,255,.06);border:1px solid rgba(94,182,255,.12)}.tips b{font-size:12px;color:#cbe7ff}.tips span{font-size:11px;color:var(--muted);line-height:1.5}
.library{margin-top:18px;padding:22px}.library h3{font-size:27px;margin:5px 0 15px}.library-filters{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:15px}.filter{border:1px solid var(--line);background:rgba(255,255,255,.035);border-radius:999px;padding:7px 12px;font-size:11px;font-weight:800;cursor:pointer}.filter.active{background:rgba(103,243,193,.13);color:var(--accent);border-color:rgba(103,243,193,.2)}.puzzle-library{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.puzzle-tile{border:1px solid var(--line);background:linear-gradient(180deg,rgba(255,255,255,.04),rgba(255,255,255,.018));border-radius:16px;padding:14px;text-align:left;cursor:pointer;transition:.2s}.puzzle-tile:hover{transform:translateY(-2px);border-color:rgba(103,243,193,.22)}.puzzle-tile .num{font-size:10px;color:var(--muted)}.puzzle-tile b{display:block;margin:5px 0 7px;font-size:14px}.puzzle-tile span{font-size:10px;color:var(--accent)}.puzzle-tile.current{outline:2px solid rgba(103,243,193,.32)}footer{display:flex;justify-content:center;gap:9px;padding:18px;color:#63768d;font-size:11px}.toast{position:fixed;left:50%;bottom:22px;z-index:120;transform:translate(-50%,22px);opacity:0;pointer-events:none;background:#0d1d30;border:1px solid var(--line);box-shadow:var(--shadow);padding:12px 16px;border-radius:13px;transition:.25s;white-space:nowrap;max-width:90vw}.toast.show{opacity:1;transform:translate(-50%,0)}.confetti{position:fixed;inset:0;pointer-events:none;z-index:110;width:100%;height:100%}
@keyframes shake{25%{transform:translateX(-5px)}50%{transform:translateX(5px)}75%{transform:translateX(-3px)}}@keyframes correctPulse{50%{transform:scale(1.03)}}@keyframes hintPulse{50%{transform:scale(1.25);opacity:.7}}
@media(max-width:980px){.game-grid{grid-template-columns:1fr}.board-frame{max-width:700px}.puzzle-library{grid-template-columns:repeat(3,1fr)}}
@media(max-width:640px){.app-shell{padding:10px}.card{border-radius:19px}.topbar{padding:10px 11px}.brand b{font-size:13px}.brand .logo{width:38px;height:38px}.metric{padding:5px 7px}.metric small{display:none}.metric b{align-self:center}.top-actions{gap:5px}.top-actions .icon-btn{width:36px;height:36px}.game-grid{gap:10px}.board-card{padding:10px}.board-head{align-items:flex-start}.side-to-move{width:100%;margin-left:0}.board-frame{padding:6px;border-radius:16px}.square{font-size:clamp(28px,10.6vw,48px)}.board-footer{padding:0 3px}.panel{padding:18px;gap:16px}.panel h2{font-size:27px}.puzzle-library{grid-template-columns:repeat(2,1fr)}.library{padding:18px;margin-top:10px}.splash-card{padding:25px 10px}.splash-logo{width:78px;height:78px;font-size:46px}.splash p{font-size:16px}}
@media(max-width:390px){.brand span:last-child{display:none}.puzzle-library{grid-template-columns:1fr}.metric{border-radius:11px}.stats-card span{font-size:9px}}