:root{--navy:#0b1220;--ink:#132033;--muted:#627086;--paper:#f5f7fb;--card:#fff;--line:#dfe5ef;--blue:#2764e7;--blue-dark:#194bb8;--blue-soft:#eaf1ff;--mint:#2db899;--mint-soft:#e7f8f4;--shadow:0 18px 50px rgba(21,40,76,.1);--shadow-soft:0 8px 26px rgba(21,40,76,.07);--radius:20px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.5;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button{cursor:pointer}a{color:inherit}
.site-header{position:sticky;top:0;z-index:20;border-bottom:1px solid rgba(223,229,239,.85);background:rgba(255,255,255,.88);backdrop-filter:blur(16px)}.nav{width:min(1180px,calc(100% - 40px));height:70px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:inline-flex;align-items:center;gap:11px;font-weight:800;letter-spacing:-.025em;text-decoration:none}.brand-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:11px;color:#fff;background:var(--blue);box-shadow:0 7px 18px rgba(39,100,231,.25);font-size:20px}.brand span:last-child{font-size:17px}.nav-links{display:flex;align-items:center;gap:28px}.nav-links a{color:#536177;font-size:14px;font-weight:650;text-decoration:none}.nav-links a:hover{color:var(--blue)}.nav-cta{padding:9px 15px;border:1px solid #cbd8f7;border-radius:10px;color:var(--blue)!important;background:var(--blue-soft)}
.hero{position:relative;overflow:hidden;padding:74px 20px 92px;color:#fff;background:radial-gradient(circle at 15% 15%,rgba(55,120,255,.24),transparent 28%),radial-gradient(circle at 86% 25%,rgba(45,184,153,.18),transparent 26%),var(--navy)}.hero:after{content:"";position:absolute;inset:0;opacity:.13;background-image:linear-gradient(rgba(255,255,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.07) 1px,transparent 1px);background-size:42px 42px;mask-image:linear-gradient(to bottom,#000,transparent 88%);pointer-events:none}.hero-inner{position:relative;z-index:1;width:min(1180px,100%);margin:0 auto;display:grid;grid-template-columns:.82fr 1.18fr;align-items:center;gap:64px}.eyebrow{display:inline-flex;align-items:center;gap:8px;margin-bottom:16px;color:#9cbcff;font-size:12px;font-weight:800;letter-spacing:.14em;text-transform:uppercase}.eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:#65d5bc;box-shadow:0 0 0 5px rgba(101,213,188,.12)}.hero h1{max-width:620px;margin:0;font-size:clamp(42px,5.4vw,70px);line-height:1.02;letter-spacing:-.055em}.hero-copy>p{max-width:550px;margin:22px 0 0;color:#aab7ca;font-size:18px;line-height:1.7}.trust-row{margin-top:28px;display:flex;flex-wrap:wrap;gap:18px;color:#c2cbd8;font-size:13px;font-weight:650}.trust-row span{display:inline-flex;align-items:center;gap:7px}.trust-row span::first-letter{color:#65d5bc}
.calculator-shell{border:1px solid rgba(255,255,255,.12);border-radius:24px;overflow:hidden;background:#f7f9fc;box-shadow:0 35px 90px rgba(0,0,0,.35)}.calc-topbar{padding:14px 18px;display:flex;align-items:center;justify-content:space-between;gap:12px;color:#a8b3c4;background:#172238;font-size:12px;font-weight:700}.calc-top-actions,.calc-status,.dev-toggle{display:flex;align-items:center}.calc-top-actions{gap:14px}.calc-status{gap:7px}.calc-status i{width:7px;height:7px;border-radius:50%;background:#62d3b8}.dev-toggle{gap:7px;cursor:pointer;user-select:none}.dev-toggle input{position:absolute;opacity:0;pointer-events:none}.switch{width:29px;height:17px;padding:2px;border-radius:999px;background:#455269;transition:.18s}.switch:before{content:"";display:block;width:13px;height:13px;border-radius:50%;background:#fff;transition:transform .18s}.dev-toggle input:checked+.switch{background:var(--blue)}.dev-toggle input:checked+.switch:before{transform:translateX(12px)}.calc-body{padding:18px}.display{min-height:112px;padding:15px 18px;border:1px solid var(--line);border-radius:15px;display:flex;flex-direction:column;align-items:flex-end;justify-content:flex-end;background:#fff;overflow:hidden}.expression{width:100%;min-height:23px;border:0;outline:0;color:var(--muted);background:transparent;text-align:right;font-size:16px}.result{width:100%;min-height:51px;color:var(--ink);text-align:right;font-size:clamp(31px,4vw,43px);font-weight:750;letter-spacing:-.035em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.calc-meta{margin:11px 2px 13px;display:flex;align-items:center;justify-content:space-between;color:#7b8798;font-size:11px;font-weight:700}.mode-toggle{display:flex;gap:3px;padding:2px;border-radius:7px;background:#e9edf4}.mode-toggle button{padding:3px 7px;border:0;border-radius:5px;color:#677489;background:transparent;font-size:10px;font-weight:800}.mode-toggle button.active{color:var(--blue);background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.1)}.keypad{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}.key{min-height:45px;border:1px solid #dfe5ee;border-radius:10px;color:#27364c;background:#fff;font-size:14px;font-weight:700;box-shadow:0 2px 4px rgba(28,43,69,.03);transition:transform .1s,border-color .1s,background .1s}.key:hover{border-color:#b7c7e8;background:#f9fbff}.key:active{transform:translateY(1px)}.key.function{color:var(--blue);background:#edf3ff;border-color:#dce7ff;font-size:12px}.key.operator{color:var(--blue);background:#e6efff;border-color:#cfddfb;font-size:18px}.key.utility{color:#9d3943;background:#fff1f2;border-color:#f6dadd}.key.equals{color:#fff;background:var(--blue);border-color:var(--blue);font-size:20px;box-shadow:0 7px 16px rgba(39,100,231,.24)}.zero-wide{grid-column:span 2}
.section{padding:88px 20px}.section.alt{background:#fff}.container{width:min(1180px,100%);margin:0 auto}.section-head{max-width:670px;margin-bottom:34px}.section-label{color:var(--blue);font-size:12px;font-weight:850;letter-spacing:.14em;text-transform:uppercase}.section-head h2{margin:8px 0 10px;font-size:clamp(30px,4vw,46px);line-height:1.1;letter-spacing:-.04em}.section-head p{margin:0;color:var(--muted);font-size:17px}.tool-filter{margin-bottom:28px;display:flex;flex-wrap:wrap;gap:8px}.filter-btn{padding:9px 15px;border:1px solid var(--line);border-radius:999px;color:#59677b;background:#fff;font-size:13px;font-weight:700}.filter-btn.active{border-color:var(--blue);color:#fff;background:var(--blue)}.tools-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.tool-card{min-height:228px;padding:24px;border:1px solid var(--line);border-radius:var(--radius);display:flex;flex-direction:column;background:var(--card);box-shadow:var(--shadow-soft);transition:transform .18s ease,box-shadow .18s ease}.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.tool-card.hidden{display:none}.tool-icon{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;color:var(--blue);background:var(--blue-soft);font-size:22px;font-weight:750}.tool-icon.green{color:#187f69;background:var(--mint-soft)}.tool-icon.amber{color:#a96a0c;background:#fff4df}.tool-card h3{margin:18px 0 7px;font-size:20px;letter-spacing:-.025em}.tool-card p{margin:0 0 20px;color:var(--muted);font-size:14px}.open-tool{margin-top:auto;padding:0;border:0;display:inline-flex;align-items:center;gap:7px;align-self:flex-start;color:var(--blue);background:transparent;font-size:14px;font-weight:800}.open-tool span{transition:transform .15s}.open-tool:hover span{transform:translateX(3px)}
.tool-panel{margin-top:18px;border:1px solid var(--line);border-radius:24px;background:#fff;box-shadow:var(--shadow);overflow:hidden;scroll-margin-top:90px}.tool-panel[hidden]{display:none}.panel-head{padding:22px 26px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px;background:#fbfcfe}.panel-title{display:flex;align-items:center;gap:13px}.panel-title .tool-icon{flex:0 0 auto}.panel-title h3{margin:0;font-size:21px}.panel-title p{margin:2px 0 0;color:var(--muted);font-size:13px}.close-panel{width:36px;height:36px;border:1px solid var(--line);border-radius:10px;color:#627086;background:#fff;font-size:20px}.panel-body{padding:28px;display:grid;grid-template-columns:1.25fr .75fr;gap:32px}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:17px;align-content:start}.field.full{grid-column:1/-1}.field label{display:block;margin-bottom:7px;color:#47556a;font-size:12px;font-weight:800}.input-wrap{position:relative}.input-wrap .prefix,.input-wrap .suffix{position:absolute;top:50%;transform:translateY(-50%);color:#8390a2;font-size:13px;font-weight:700;pointer-events:none}.input-wrap .prefix{left:13px}.input-wrap .suffix{right:13px}.field input,.field select{width:100%;height:46px;padding:0 13px;border:1px solid #d7dfeb;border-radius:10px;outline:0;color:var(--ink);background:#fff;transition:border-color .15s,box-shadow .15s}.field input.has-prefix{padding-left:30px}.field input.has-suffix{padding-right:50px}.field input:focus,.field select:focus{border-color:#7da4fa;box-shadow:0 0 0 3px rgba(39,100,231,.1)}.calculate-btn{grid-column:1/-1;min-height:47px;border:0;border-radius:11px;color:#fff;background:var(--blue);font-weight:800;box-shadow:0 8px 20px rgba(39,100,231,.2)}.calculate-btn:hover{background:var(--blue-dark)}.answer-box{min-height:205px;padding:24px;border:1px solid #dbe7ff;border-radius:16px;background:linear-gradient(145deg,#f4f8ff,#edf4ff)}.answer-label{color:#65758c;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.answer-value{margin:7px 0 16px;color:var(--blue-dark);font-size:clamp(28px,4vw,40px);font-weight:850;letter-spacing:-.045em;overflow-wrap:anywhere}.answer-details{border-top:1px solid #d8e5fc;padding-top:14px;display:grid;gap:9px}.answer-row{display:flex;justify-content:space-between;gap:12px;color:#617188;font-size:13px}.answer-row strong{color:#263951;text-align:right}.answer-note{margin-top:14px;color:#728198;font-size:11px;line-height:1.5}
.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}.why-item{padding:25px 0;border-top:2px solid #e1e7f0}.why-number{color:var(--blue);font-size:12px;font-weight:850;letter-spacing:.1em}.why-item h3{margin:12px 0 7px;font-size:20px}.why-item p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}footer{padding:34px 20px;border-top:1px solid var(--line);background:#fff}.footer-inner{width:min(1180px,100%);margin:0 auto;display:flex;justify-content:space-between;gap:20px;color:#79869a;font-size:12px}.footer-brand{color:var(--ink);font-weight:800}.toast{position:fixed;right:20px;bottom:20px;z-index:30;padding:12px 16px;border-radius:10px;color:#fff;background:#172238;box-shadow:var(--shadow);font-size:13px;font-weight:700;opacity:0;transform:translateY(12px);pointer-events:none;transition:.2s ease}.toast.show{opacity:1;transform:translateY(0)}
.games-view{display:none;min-height:100vh;padding:64px 20px;background:radial-gradient(circle at 15% 15%,rgba(39,100,231,.12),transparent 30%),var(--paper)}.games-view.unlocked{display:block}.body-game-open>.site-header,.body-game-open>main>section:not(.games-view),.body-game-open>footer{display:none}.games-shell{width:min(1040px,100%);margin:0 auto}.games-header{margin-bottom:30px;display:flex;align-items:flex-end;justify-content:space-between;gap:20px}.games-header h2{margin:6px 0 5px;font-size:clamp(38px,6vw,58px);line-height:1;letter-spacing:-.045em}.games-header p{margin:0;color:var(--muted)}.lock-button{min-height:44px;padding:0 16px;border:1px solid var(--line);border-radius:11px;color:#405069;background:#fff;font-weight:800}.game-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.game-card{min-height:150px;padding:20px;border:1px solid var(--line);border-radius:18px;display:flex;align-items:flex-start;gap:16px;color:var(--ink);background:#fff;box-shadow:var(--shadow-soft);text-decoration:none;transition:.18s}.game-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.game-icon{width:45px;height:45px;flex:0 0 auto;border-radius:13px;display:grid;place-items:center;color:#fff;background:var(--blue);font-size:21px;font-weight:850}.game-card h3{margin:3px 0 6px;font-size:19px}.game-card p{margin:0;color:var(--muted);font-size:13px}.snake .game-icon,.wordle .game-icon{background:#249365}.connections .game-icon,.crossword .game-icon{background:#7c4ed8}.minesweeper .game-icon{background:#e59b28}.game2048 .game-icon{background:#d85353}.tetris .game-icon{background:#15998d}.sudoku .game-icon{background:#526176}
@media(max-width:940px){.hero-inner{grid-template-columns:1fr;gap:42px}.hero-copy{text-align:center}.hero-copy>p{margin-left:auto;margin-right:auto}.trust-row{justify-content:center}.calculator-shell{width:min(680px,100%);margin:0 auto}.tools-grid{grid-template-columns:repeat(2,1fr)}.panel-body{grid-template-columns:1fr}.game-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:650px){.nav{width:min(100% - 28px,1180px)}.nav-links a:not(.nav-cta){display:none}.brand span:last-child{font-size:15px}.hero{padding:52px 14px 64px}.hero h1{font-size:43px}.hero-copy>p{font-size:16px}.calc-topbar{align-items:flex-start}.calc-top-actions{align-items:flex-end;flex-direction:column;gap:5px}.calc-status{display:none}.calc-body{padding:12px}.display{min-height:98px}.keypad{gap:6px}.key{min-height:42px;font-size:13px}.key.function{font-size:10px}.section{padding:62px 14px}.tools-grid{grid-template-columns:1fr}.tool-card{min-height:205px}.panel-head{padding:18px}.panel-title p{display:none}.panel-body{padding:20px;gap:22px}.form-grid{grid-template-columns:1fr}.field.full,.calculate-btn{grid-column:auto}.why-grid{grid-template-columns:1fr;gap:8px}.footer-inner{flex-direction:column}.games-view{padding:38px 14px}.games-header{align-items:flex-start;flex-direction:column}.game-grid{grid-template-columns:1fr}.game-card{min-height:125px}}