:root{
  --bg:#f4f6f9;--surface:#fff;--surface2:#eef1f5;--text:#1b2430;--muted:#5d6b7c;
  --primary:#e8710a;--primary-h:#c85f06;--on-primary:#fff;--border:#d9dfe7;--shadow:0 2px 10px rgba(20,30,50,.08);
  --ok:#1a8f4c;--ad:#e9edf3;
}
[data-theme=dark]{
  --bg:#12161c;--surface:#1b212a;--surface2:#232a35;--text:#e6ebf2;--muted:#9aa7b8;
  --primary:#ff8c1a;--primary-h:#ffa04a;--on-primary:#161a20;--border:#2d3745;--shadow:0 2px 10px rgba(0,0,0,.4);
  --ok:#4cd388;--ad:#1f2631;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.55;transition:background .2s,color .2s}
.container{max-width:1240px;margin:0 auto;padding:0 16px}
a{color:var(--primary);text-decoration:none}
h1{font-size:2rem;margin:.6em 0 .2em}
h2{margin:1.6em 0 .6em}
.sub{color:var(--muted);margin-top:0}
.note{color:var(--muted);font-size:.85rem}

.header{position:sticky;top:0;z-index:50;background:var(--surface);border-bottom:1px solid var(--border);box-shadow:var(--shadow)}
.header-in{display:flex;align-items:center;gap:20px;height:60px}
.logo{font-size:1.3rem;font-weight:500;color:var(--text);display:flex;align-items:center;gap:6px}
.logo b{color:var(--primary)}
.logo-ic{color:var(--primary);font-size:1.5rem}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{color:var(--text);padding:8px 14px;border-radius:8px;font-weight:500}
.nav a:hover{background:var(--surface2)}
.nav a.active{background:var(--primary);color:var(--on-primary)}
.tools{display:flex;gap:8px;align-items:center}
select,input{font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:8px 10px;width:100%}
.tools select{width:auto}
select:focus,input:focus{outline:2px solid var(--primary);outline-offset:-1px}
.icon-btn{background:var(--surface2);border:1px solid var(--border);border-radius:8px;width:38px;height:38px;cursor:pointer;font-size:1.1rem;color:var(--text)}
.burger{display:none}

.btn{display:inline-block;background:var(--primary);color:var(--on-primary);padding:12px 24px;border-radius:10px;font-weight:600;border:0}
.btn:hover{background:var(--primary-h)}
.btn-sec{background:transparent;color:var(--text);border:2px solid var(--border)}
.btn-sec:hover{background:var(--surface2)}

.hero{padding:40px 0 24px;text-align:center}
.hero h1{font-size:2.6rem;max-width:800px;margin:0 auto .3em}
.hero p{color:var(--muted);max-width:640px;margin:0 auto 24px;font-size:1.1rem}
.hero-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.calcs{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:18px;box-shadow:var(--shadow)}
.feat-c{color:var(--text);transition:transform .15s}
a.feat-c:hover{transform:translateY(-3px);border-color:var(--primary)}
.feat-ic{font-size:2rem}
.feat-c h3{margin:.4em 0 .2em}
.feat-c p{margin:0;color:var(--muted);font-size:.93rem}

.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;align-items:start}
.layout[hidden]{display:none}
.side{position:sticky;top:76px}

.calc h3{margin:0 0 12px;display:flex;align-items:center;gap:8px;font-size:1.1rem}
.field{margin-bottom:10px}
.field[hidden]{display:none}
.field label{display:block;font-size:.82rem;color:var(--muted);margin-bottom:3px}
.results{margin-top:14px;background:var(--surface2);border-radius:10px;padding:10px 14px}
.res{display:flex;justify-content:space-between;gap:10px;padding:4px 0;border-bottom:1px dashed var(--border)}
.res:last-child{border:0}
.res span{color:var(--muted);font-size:.9rem}
.res b{color:var(--primary);white-space:nowrap}
.calc .hint{font-size:.8rem;color:var(--muted);margin:8px 0 0}

.table-wrap{overflow-x:auto;padding:0}
table{width:100%;border-collapse:collapse}
th,td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--border);vertical-align:top}
th{background:var(--surface2);font-size:.82rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
tr:last-child td{border:0}
td.code{font-weight:700;color:var(--primary);font-family:Consolas,monospace;white-space:nowrap;font-size:1.05rem}
td.ex{font-family:Consolas,monospace;font-size:.88rem;color:var(--muted)}
.codes-bar{display:flex;gap:12px;margin-bottom:12px;flex-wrap:wrap}
.codes-bar input{flex:1;min-width:200px}
.tabs{display:flex;border:1px solid var(--border);border-radius:8px;overflow:hidden}
.tab{background:var(--surface);color:var(--text);border:0;padding:8px 24px;font-weight:700;cursor:pointer;font-size:1rem}
.tab.active{background:var(--primary);color:var(--on-primary)}

.art-card{display:flex;flex-direction:column;color:var(--text);transition:transform .15s}
.art-card:hover{transform:translateY(-3px);border-color:var(--primary)}
.art-card .tag{color:var(--primary);font-size:.78rem;font-weight:700;text-transform:uppercase}
.art-card h3{margin:.3em 0}
.art-card p{color:var(--muted);flex:1;margin:0 0 10px;font-size:.93rem}
.art-card .more{color:var(--primary);font-weight:600}
.article{padding:28px 32px}
.article h1{margin-top:0}
.article h2{font-size:1.3rem}
.article code{background:var(--surface2);padding:2px 6px;border-radius:5px;font-family:Consolas,monospace}
.article pre{background:var(--surface2);padding:12px;border-radius:8px;overflow-x:auto}
.back{display:inline-block;margin:12px 0}

.ad-slot{margin:16px auto;text-align:center}
.ad-ph{display:flex;align-items:center;justify-content:center;text-align:center;border:2px dashed var(--border);background:var(--ad);color:var(--muted);border-radius:10px;font-size:.8rem;text-transform:uppercase;letter-spacing:.05em}
.ad-top .ad-ph{min-height:90px;max-width:728px;margin:0 auto}
.ad-inline .ad-ph{min-height:250px;max-width:728px;margin:0 auto}
.ad-side .ad-ph{min-height:600px}

.footer{margin-top:40px;padding:24px 0;border-top:1px solid var(--border);background:var(--surface);text-align:center}
.page,.home-only{display:none}
body[data-route=home] .page[data-page=home],body[data-route=calc] .page[data-page=calc],body[data-route=codes] .page[data-page=codes],
body[data-route=articles] .page[data-page=articles],body[data-route=article] .page[data-page=article]{display:block}
body[data-route=home] .home-only{display:block}
body[data-route=home] #layout{display:none}

/* hero */
.hero-full{position:relative;color:#fff;background:linear-gradient(90deg,rgba(10,13,18,.96) 0%,rgba(10,13,18,.82) 45%,rgba(10,13,18,.35) 100%),url("../images/hero.jpg") center/cover no-repeat;padding:72px 0 64px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:40px;align-items:center}
.hero-badge{display:inline-block;background:rgba(255,140,26,.18);border:1px solid rgba(255,140,26,.55);color:#ffb15c;padding:5px 14px;border-radius:999px;font-size:.82rem;margin-bottom:16px}
.hero-full h1{font-size:3rem;line-height:1.1;margin:0 0 16px;color:#fff;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.hero-full p{color:#d3dae4;font-size:1.15rem;max-width:560px;margin:0 0 26px}
.hero-full .btn{background:#ff8c1a;color:#161a20}
.hero-full .btn:hover{background:#ffa04a}
.btn-ghost{background:rgba(255,255,255,.08)!important;color:#fff!important;border:2px solid rgba(255,255,255,.35)}
.btn-ghost:hover{background:rgba(255,255,255,.18)!important}
.stats{display:flex;gap:28px;margin-top:34px;flex-wrap:wrap}
.stats div{display:flex;flex-direction:column}
.stats b{font-size:2rem;color:#ff8c1a;line-height:1}
.stats span{font-size:.82rem;color:#aab4c2;margin-top:4px}
.terminal{background:rgba(8,11,15,.82);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.14);border-radius:12px;box-shadow:0 20px 50px rgba(0,0,0,.5);overflow:hidden}
.term-bar{display:flex;align-items:center;gap:6px;padding:10px 14px;background:rgba(255,255,255,.07);font-size:.8rem;color:#9aa7b8}
.term-bar i{width:11px;height:11px;border-radius:50%;background:#ff5f56}
.term-bar i:nth-child(2){background:#ffbd2e}.term-bar i:nth-child(3){background:#27c93f}
.term-bar span{margin-left:10px;font-family:Consolas,monospace}
.terminal pre{margin:0;padding:16px 18px;min-height:330px;font:.9rem/1.55 Consolas,"Courier New",monospace;color:#7ee787;white-space:pre-wrap}
.more-link{text-align:right;margin:8px 0}
.more-link a{font-weight:600}
main#main>.page[data-page=home]>h2:first-child{margin-top:28px}

/* saved + save button */
.btn-save{margin-top:12px;width:100%;background:transparent;color:var(--primary);border:1.5px solid var(--primary);border-radius:8px;padding:8px;font:inherit;font-weight:600;cursor:pointer}
.btn-save:hover{background:var(--primary);color:var(--on-primary)}
.saved-bar{display:flex;gap:8px;justify-content:flex-end;margin-bottom:10px}
.btn-sm{background:var(--surface2);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:5px 12px;cursor:pointer;font:inherit;font-size:.85rem}
.btn-sm:hover{border-color:var(--primary)}
.btn-sm.danger:hover{border-color:#e5484d;color:#e5484d}
.saved-item{display:grid;grid-template-columns:1fr auto;gap:6px 14px;padding:12px 0;border-top:1px solid var(--border)}
.saved-head{grid-column:1/-1;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.saved-head small{color:var(--muted)}
.saved-body span{display:inline-block;margin:2px 14px 2px 0;font-size:.88rem;color:var(--muted)}
.saved-body b{color:var(--text)}
.saved-res span b{color:var(--primary)}
.saved-act{display:flex;gap:6px;align-items:flex-start}
.ctl-lab{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--muted)}
.ctl-lab select{width:auto}
.res b{text-align:right;font-family:Consolas,monospace}
@media(max-width:960px){.hero-grid{grid-template-columns:1fr}.terminal{display:none}.hero-full h1{font-size:2.2rem}.hero-full{padding:48px 0}}


@media(max-width:960px){
  .layout{grid-template-columns:1fr}
  .side{display:none}
}
@media(max-width:720px){
  .burger{display:block}
  .nav{display:none;position:absolute;top:60px;left:0;right:0;background:var(--surface);flex-direction:column;padding:10px 16px;border-bottom:1px solid var(--border)}
  .nav.open{display:flex}
  .hero h1{font-size:1.8rem}
  .article{padding:18px}
  .logo{margin-right:auto}
}

.ad-live{overflow:hidden;max-width:100%}
@media(max-width:760px){.ad-top.ad-live{display:none}}
.cookie-bar{position:fixed;left:16px;right:16px;bottom:16px;max-width:760px;margin:0 auto;z-index:100;background:var(--surface);border:1px solid var(--border);box-shadow:0 8px 30px rgba(0,0,0,.35);border-radius:12px;padding:14px 18px;display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.cookie-bar p{margin:0;flex:1;min-width:240px;font-size:.88rem}
.cookie-bar div{display:flex;gap:8px}
.btn-acc{background:var(--primary);color:var(--on-primary);border:0;border-radius:6px;padding:6px 16px;font:inherit;font-weight:600;cursor:pointer}
html:not(.ads-on) .ad-live{display:none}
.ad-live ins{max-width:100%}