* { box-sizing: border-box; }
:root { color-scheme: light dark; --bg:#eef8fb; --surface:rgba(255,255,255,.86); --surface-strong:#ffffff; --text:#142127; --muted:#65747a; --border:rgba(20,33,39,.13); --primary:#0f8fb8; --primary-dark:#0c4051; --cream:#f3f2df; --gold:#d7a94f; --shadow:0 22px 70px rgba(12,64,81,.14); }
@media (prefers-color-scheme: dark){:root{--bg:#0d1e25;--surface:rgba(21,39,47,.88);--surface-strong:#132b34;--text:#edf7f5;--muted:#b7c8c4;--border:rgba(255,255,255,.13);--shadow:0 24px 76px rgba(0,0,0,.36)}}
html,body{min-height:100%;margin:0} body{color:var(--text);background:linear-gradient(145deg,rgba(15,143,184,.18),transparent 34%),linear-gradient(28deg,rgba(215,169,79,.16),transparent 42%),linear-gradient(315deg,rgba(243,242,223,.7),transparent 38%),var(--bg);font-family:Avenir Next,Avenir,Trebuchet MS,Segoe UI,sans-serif;line-height:1.62} a{color:inherit;text-decoration:none} a:hover{text-decoration:underline}.page{padding:28px 0 48px}.container{width:min(1120px,calc(100% - 32px));margin:0 auto}.topbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:18px;margin-bottom:20px}.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800}.brand img{width:38px;height:38px;border-radius:8px}.nav{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:14px}.nav a,.language-switch{min-height:34px;display:inline-flex;align-items:center;color:var(--muted);font-size:14px;font-weight:700}.language-switch{gap:8px}.language-switch select{height:34px;padding:0 32px 0 10px;border:1px solid var(--border);border-radius:8px;background:var(--surface-strong);color:var(--text);font:inherit}.hero{min-height:calc(100vh - 116px);display:grid;grid-template-columns:minmax(0,1.04fr) minmax(300px,420px);align-items:center;gap:44px}.kicker{width:fit-content;margin:0 0 14px;padding:7px 11px;border:1px solid var(--border);border-radius:999px;color:var(--primary);background:var(--surface);font-size:13px;font-weight:800}h1,h2{margin:0 0 12px;line-height:1.1;letter-spacing:0}h1{font-size:64px}h2{font-size:30px}.lead{max-width:660px;margin:0;color:var(--muted);font-size:20px}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.button{min-height:48px;display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:0 18px;border:1px solid var(--border);border-radius:8px;background:var(--surface-strong);color:var(--text);font-weight:800;box-shadow:0 8px 22px rgba(12,64,81,.10)}.button.primary{border-color:transparent;background:linear-gradient(135deg,var(--primary-dark),var(--primary));color:white}.product-panel{padding:18px;border:1px solid var(--border);border-radius:8px;background:var(--surface);box-shadow:var(--shadow)}.sudoku-card{padding:18px;border-radius:8px;background:linear-gradient(145deg,var(--cream),#fff)}.sudoku-grid{display:grid;grid-template-columns:repeat(9,1fr);aspect-ratio:1;border:3px solid #101820;background:#101820;gap:1px}.sudoku-grid span{background:#fbfbef}.sudoku-grid span:nth-child(3n){border-right:2px solid #101820}.sudoku-grid span:nth-child(n+19):nth-child(-n+27),.sudoku-grid span:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid #101820}.stats{display:flex;gap:8px;margin-top:14px}.stats span{flex:1;padding:8px;border-radius:8px;text-align:center;background:var(--surface-strong);font-weight:800;color:var(--primary-dark)}.section{margin-top:52px;padding:30px;border:1px solid var(--border);border-radius:8px;background:var(--surface)}.feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.feature-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.feature{padding:18px;border:1px solid var(--border);border-radius:8px;background:var(--surface-strong)}.feature strong{display:block;margin-bottom:8px}.feature p{margin:0;color:var(--muted)}.article{max-width:860px}.article .section{padding:26px}.footer{margin-top:38px;color:var(--muted);font-size:14px}.nav-download{min-height:38px;display:inline-flex;align-items:center;gap:7px;padding:0 11px;border:1px solid var(--border);border-radius:8px;background:var(--surface-strong);color:var(--primary-dark);font-size:14px;font-weight:800;box-shadow:0 6px 18px rgba(12,64,81,.08)}.nav-download img,.store-icon{width:20px;height:20px;display:block}.button.store{gap:10px}.button.store .store-icon{width:22px;height:22px}.app-cta{display:flex;align-items:center;justify-content:space-between;gap:22px;background:linear-gradient(135deg,rgba(15,143,184,.12),rgba(243,242,223,.72)),var(--surface)}.app-cta p{max-width:700px;margin:0;color:var(--muted)}@media(max-width:820px){.app-cta{align-items:flex-start;flex-direction:column}.app-cta .button{width:100%}}@media(max-width:820px){.hero{min-height:auto;grid-template-columns:1fr;padding-top:22px}h1{font-size:44px}.lead{font-size:18px}.feature-grid,.feature-grid.two{grid-template-columns:1fr}.nav{justify-content:flex-start}.product-panel{order:-1}}