:root{
  --page:#f5f7fb;
  --surface:#ffffff;
  --ink:#141821;
  --muted:#687080;
  --line:#dfe4ec;
  --blue:#1262eb;
  --blue-dark:#0b45a8;
  --blue-soft:#edf4ff;
  --orange:#ef922f;
  --orange-soft:#fff4e5;
  --green:#32a779;
  --danger:#dc4b5d;
  --shadow:0 20px 55px rgba(27,38,61,.09);
}
*{box-sizing:border-box}
html{min-width:320px;background:var(--page);scroll-behavior:smooth}
body{margin:0;color:var(--ink);background:radial-gradient(circle at 50% 0,#fff 0,#f7f9fc 35%,var(--page) 100%);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}
button,input,select{font:inherit;color:inherit}
button,a{-webkit-tap-highlight-color:transparent}
a{color:inherit;text-decoration:none}
.shell{width:min(1240px,calc(100% - 40px));margin-inline:auto}
.game-header{position:sticky;top:0;z-index:30;border-bottom:1px solid var(--line);background:rgba(255,255,255,.92);backdrop-filter:blur(16px)}
.game-header-inner{height:66px;display:flex;align-items:center;gap:36px}
.game-brand{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:850;letter-spacing:-.04em}
.game-brand-mark{width:24px;height:24px;display:grid;grid-template-columns:repeat(2,1fr);gap:3px}
.game-brand-mark i{display:block;border-radius:2px;background:#151821}
.game-brand-mark i:nth-child(2){background:var(--blue)}
.game-brand-mark i:nth-child(3){background:#55bfa1}
.game-brand-mark i:nth-child(4){background:#ff9b51}
.game-nav{display:flex;align-items:center;gap:24px;font-size:13px;font-weight:700}
.game-nav a:hover{color:var(--blue)}
.header-home{margin-left:auto;border:1px solid var(--line);border-radius:10px;padding:10px 15px;font-size:13px;font-weight:750;background:#fff}
.game-main{padding:46px 0 68px}
.page-intro{display:flex;align-items:end;justify-content:space-between;gap:40px;margin-bottom:28px}
.page-intro h1{margin:5px 0 10px;font-size:clamp(38px,5vw,66px);line-height:.96;letter-spacing:-.06em}
.page-intro p{max-width:670px;margin:0;color:var(--muted);font-size:16px;line-height:1.6}
.eyebrow{display:block;color:var(--blue);font-size:11px;font-weight:850;letter-spacing:.15em;text-transform:uppercase}
.intro-badge{flex:0 0 auto;display:flex;gap:10px;align-items:center;padding:13px 17px;border:1px solid #cfe0ff;border-radius:14px;background:var(--blue-soft);color:var(--blue-dark);font-size:12px;font-weight:800}
.control-panel{border:1px solid var(--line);border-radius:18px;background:rgba(255,255,255,.94);box-shadow:var(--shadow);padding:18px;margin-bottom:24px}
.controls-row{display:flex;align-items:end;gap:14px;flex-wrap:wrap}
.field{display:grid;gap:7px;min-width:170px}
.field label,.field>span{font-size:11px;color:var(--muted);font-weight:800;text-transform:uppercase;letter-spacing:.08em}
.field select{height:44px;border:1px solid #d9dfe8;border-radius:10px;background:#fff;padding:0 38px 0 13px;font-weight:700;outline:none}
.field select:focus{border-color:#86aff7;box-shadow:0 0 0 4px rgba(18,98,235,.08)}
.check-field{min-height:44px;display:flex;align-items:center;gap:9px;padding:0 13px;border:1px solid #d9dfe8;border-radius:10px;background:#fff;font-size:13px;font-weight:700;cursor:pointer}
.check-field input{accent-color:var(--blue);width:17px;height:17px}
.control-actions{margin-left:auto;display:flex;gap:10px}
.ui-button{min-height:44px;padding:0 18px;border:0;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--blue);color:#fff;font-weight:800;cursor:pointer;box-shadow:0 10px 24px rgba(18,98,235,.18);transition:transform .2s,background .2s,box-shadow .2s}
.ui-button:hover{transform:translateY(-1px);background:#0755d6;box-shadow:0 13px 28px rgba(18,98,235,.23)}
.ui-button.secondary{border:1px solid #d9dfe8;background:#fff;color:var(--ink);box-shadow:none}
.ui-button.secondary:hover{background:#f7f9fc}
.ui-button.orange{background:var(--orange);box-shadow:0 10px 24px rgba(239,146,47,.2)}
.status-line{min-height:22px;margin-top:12px;color:var(--muted);font-size:12px}
.status-line strong{color:var(--blue)}
.print-workspace{display:grid;gap:24px}
.print-page{width:min(100%,900px);aspect-ratio:210/297;margin-inline:auto;padding:44px;background:#fff;border:1px solid #e0e3e8;border-radius:6px;box-shadow:0 24px 70px rgba(25,35,55,.12);display:flex;flex-direction:column}
.sheet-header{display:flex;align-items:start;justify-content:space-between;border-bottom:1px solid #cfd4dc;padding-bottom:16px;margin-bottom:24px}
.sheet-header h2{margin:0;font-size:25px;letter-spacing:-.04em}
.sheet-header p{margin:4px 0 0;color:#687080;font-size:11px}
.sheet-code{font:700 10px/1.4 ui-monospace,SFMono-Regular,Consolas,monospace;color:#616977;text-align:right}
.puzzle-layout{flex:1;display:grid;gap:28px;align-content:center}
.puzzle-layout.count-1{grid-template-columns:minmax(0,1fr);max-width:610px;width:100%;margin:auto}
.puzzle-layout.count-2{grid-template-columns:1fr 1fr;gap:26px}
.puzzle-layout.count-4{grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr;gap:24px 30px}
.print-puzzle{display:flex;flex-direction:column;min-width:0}
.puzzle-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;font-size:10px;color:#5f6672;font-weight:700}
.puzzle-head b{color:#171a20;font-size:12px}
.print-grid{display:grid;grid-template-columns:repeat(9,1fr);aspect-ratio:1;border:2.5px solid #101319;background:#fff}
.print-cell{display:grid;place-items:center;border-right:1px solid #9298a2;border-bottom:1px solid #9298a2;font-family:Arial,sans-serif;font-size:clamp(10px,1.8vw,21px);font-weight:500;color:#101319}
.print-cell:nth-child(9n){border-right:0}
.print-cell:nth-child(n+73){border-bottom:0}
.print-cell:nth-child(9n+3),.print-cell:nth-child(9n+6){border-right:2.5px solid #101319}
.print-cell:nth-child(n+19):nth-child(-n+27),.print-cell:nth-child(n+46):nth-child(-n+54){border-bottom:2.5px solid #101319}
.print-cell.solution-value{color:#285493;font-weight:650}
.sheet-footer{display:flex;justify-content:space-between;border-top:1px solid #d7dbe1;margin-top:22px;padding-top:11px;color:#7b818b;font-size:9px}
.print-help{width:min(100%,900px);margin:24px auto 0;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.help-card{border:1px solid var(--line);border-radius:14px;background:#fff;padding:18px}
.help-card b{display:block;margin-bottom:5px;font-size:14px}
.help-card p{margin:0;color:var(--muted);font-size:12px;line-height:1.55}

.kalku-shell{width:min(1160px,calc(100% - 40px));margin-inline:auto}
.kalku-layout{display:grid;grid-template-columns:minmax(430px,680px) 330px;gap:20px;align-items:start}
.game-card{border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:var(--shadow)}
.kalku-board-card{padding:20px}
.kalku-status{min-height:64px;display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:13px;background:#fafbfc;margin-bottom:16px}
.kalku-status>div{display:flex;flex-direction:column;justify-content:center;padding:0 15px;border-left:1px solid var(--line)}
.kalku-status>div:first-child{border-left:0}
.kalku-status span{font-size:9px;color:var(--muted);font-weight:800;letter-spacing:.1em;text-transform:uppercase}
.kalku-status b{font-size:17px;margin-top:2px}
.kalku-board{--size:6;width:min(100%,620px);aspect-ratio:1;margin:auto;display:grid;grid-template-columns:repeat(var(--size),1fr);grid-template-rows:repeat(var(--size),1fr);border:3px solid #141821;background:#fff;user-select:none}
.kalku-cell{position:relative;border:0;border-right:1px solid #aeb5c0;border-bottom:1px solid #aeb5c0;background:#fff;padding:0;display:grid;place-items:center;cursor:pointer;transition:background .15s}
.kalku-cell:hover{background:#f5f8fd}
.kalku-cell.selected{background:#dce9ff}
.kalku-cell.related{background:#f0f5fd}
.kalku-cell.same-cage{background:#edf4ff}
.kalku-cell.conflict{background:#ffe7eb;color:#b52339;animation:shake .25s linear 1}
.kalku-cell.hinted .cell-value{color:var(--blue)}
.kalku-cell.edge-top{border-top:3px solid #151922}
.kalku-cell.edge-right{border-right:3px solid #151922}
.kalku-cell.edge-bottom{border-bottom:3px solid #151922}
.kalku-cell.edge-left{border-left:3px solid #151922}
.cage-label{position:absolute;left:4px;top:3px;font-size:clamp(8px,1.2vw,13px);font-weight:850;line-height:1;z-index:2}
.cell-value{font-size:clamp(24px,5vw,48px);font-weight:650;line-height:1}
.side-stack{display:grid;gap:14px}
.side-panel{padding:20px}
.side-panel h2{margin:0 0 16px;font-size:18px;letter-spacing:-.03em}
.number-pad{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.number-button{height:58px;border:1px solid #cdd9e9;border-radius:11px;background:#f7faff;color:#17345f;font-size:24px;font-weight:750;cursor:pointer;transition:transform .15s,background .15s}
.number-button:hover{transform:translateY(-1px);background:#eaf3ff}
.action-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}
.action-button{min-height:46px;border:1px solid #d9dfe8;border-radius:10px;background:#fff;font-size:12px;font-weight:750;cursor:pointer}
.action-button:hover{background:#f7f9fc}
.action-button.primary{grid-column:1/-1;background:var(--blue);border-color:var(--blue);color:#fff}
.action-button:disabled{opacity:.45;cursor:not-allowed}
.difficulty-panel{display:grid;gap:9px}
.difficulty-panel select{height:44px;border:1px solid #d9dfe8;border-radius:10px;background:#fff;padding:0 12px;font-weight:750}
.rules-card{padding:20px;background:linear-gradient(145deg,#fffaf3,var(--orange-soft));border-color:#f2d7b6}
.rules-card h2{margin:0 0 9px;font-size:18px}
.rules-card p{margin:0;color:#756452;font-size:12px;line-height:1.6}
.game-message{min-height:20px;margin:13px 2px 0;color:var(--muted);font-size:12px;font-weight:650}
.game-message.error{color:var(--danger)}
.game-message.success{color:var(--green)}
.win-overlay{position:fixed;inset:0;z-index:60;display:grid;place-items:center;padding:20px;background:rgba(10,14,23,.56);backdrop-filter:blur(7px)}
.win-overlay.hidden{display:none}
.win-modal{width:min(440px,100%);border-radius:22px;background:#fff;padding:34px;text-align:center;box-shadow:0 30px 90px rgba(0,0,0,.25)}
.win-icon{width:70px;height:70px;margin:0 auto 16px;display:grid;place-items:center;border-radius:50%;background:#eaf8f2;color:var(--green);font-size:32px}
.win-modal h2{font-size:34px;letter-spacing:-.05em;margin:0 0 8px}
.win-modal p{color:var(--muted);margin:0 0 22px}
.win-stats{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:12px;margin-bottom:20px}
.win-stats div{padding:13px 6px;border-left:1px solid var(--line)}
.win-stats div:first-child{border-left:0}
.win-stats span,.win-stats b{display:block}
.win-stats span{font-size:9px;color:var(--muted);text-transform:uppercase;font-weight:800}
.win-stats b{margin-top:4px}
.win-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px}
.app-footer{border-top:1px solid var(--line);padding:28px 0;color:var(--muted);font-size:12px;background:#fff}
.app-footer-inner{display:flex;align-items:center;justify-content:space-between;gap:20px}
.app-footer nav{display:flex;gap:18px}
@keyframes shake{25%{transform:translateX(-2px)}75%{transform:translateX(2px)}}

@media(max-width:900px){.page-intro{display:block}.intro-badge{width:max-content;margin-top:18px}.kalku-layout{grid-template-columns:1fr}.side-stack{grid-template-columns:1fr 1fr}.rules-card{grid-column:1/-1}.game-library{grid-template-columns:repeat(2,1fr)}}
@media(max-width:680px){.shell,.kalku-shell{width:min(100% - 24px,1240px)}.game-header-inner{height:60px}.game-nav{display:none}.header-home{padding:9px 12px}.game-main{padding:30px 0 48px}.page-intro h1{font-size:42px}.control-actions{width:100%;margin-left:0}.control-actions .ui-button{flex:1}.field{flex:1;min-width:135px}.print-page{padding:24px 18px;aspect-ratio:auto;min-height:900px}.puzzle-layout.count-2,.puzzle-layout.count-4{grid-template-columns:1fr 1fr;gap:20px 15px}.print-help{grid-template-columns:1fr}.side-stack{grid-template-columns:1fr}.kalku-board-card{padding:10px}.kalku-status>div{padding:0 8px}.kalku-status span{font-size:8px}.kalku-status b{font-size:14px}.cell-value{font-size:clamp(22px,9vw,44px)}.number-pad{grid-template-columns:repeat(var(--pad-cols,3),1fr)}.app-footer-inner{align-items:flex-start;flex-direction:column}}
@media(max-width:440px){.game-brand{font-size:19px}.page-intro h1{font-size:37px}.puzzle-layout.count-2,.puzzle-layout.count-4{grid-template-columns:1fr}.print-page{min-height:auto}.sheet-header h2{font-size:20px}.print-cell{font-size:13px}.kalku-status{grid-template-columns:1fr 1fr}.kalku-status>div:nth-child(3){border-left:0;border-top:1px solid var(--line)}.kalku-status>div:nth-child(4){border-top:1px solid var(--line)}}
@media print{
  @page{size:A4 portrait;margin:0}
  html,body{background:#fff!important}
  .no-print,.game-header,.app-footer{display:none!important}
  .game-main{padding:0!important}
  .shell{width:100%!important;margin:0!important}
  .print-workspace{display:block!important}
  .print-page{width:210mm!important;height:297mm!important;min-height:297mm!important;aspect-ratio:auto!important;margin:0!important;padding:13mm 14mm!important;border:0!important;border-radius:0!important;box-shadow:none!important;break-after:page;page-break-after:always}
  .print-page:last-child{break-after:auto;page-break-after:auto}
  .print-grid{print-color-adjust:exact;-webkit-print-color-adjust:exact}
  .print-cell{font-size:12pt!important}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}