:root{
  --bg:#000000;
  --surface:#0d0f12;
  --surface-2:#14171c;
  --border:#23272e;
  --text:#f2f4f7;
  --text-dim:#9aa3af;
  --text-faint:#6b7280;
  --accent:#30d158;
  --accent-dim:#1f8c3b;
  --accent-glow:rgba(48,209,88,.14);
  --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding:0 24px}
.container-narrow{max-width:800px;margin:0 auto;padding:0 24px}

/* NAV */
nav.site-nav{
  position:sticky;top:0;z-index:50;
  background:rgba(0,0,0,.78);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.2rem;letter-spacing:-.02em}
.logo-mark{
  width:32px;height:32px;border-radius:9px;
  background:linear-gradient(135deg,var(--accent),#0a84ff);
  display:flex;align-items:center;justify-content:center;
  font-size:.95rem;font-weight:800;color:#000;
}
.nav-links{display:flex;gap:28px;align-items:center;font-size:.92rem;color:var(--text-dim)}
.nav-links a:hover{color:var(--text)}
.nav-cta{
  background:var(--accent);color:#000!important;font-weight:600;
  padding:8px 18px;border-radius:999px;transition:transform .15s;
}
.nav-cta:hover{transform:scale(1.04)}
@media(max-width:720px){.nav-links a:not(.nav-cta){display:none}}

/* PAGE HEADER */
.page-head{padding:72px 0 12px;text-align:center;position:relative;overflow:hidden}
.page-head::before{
  content:'';position:absolute;inset:-60% -20% auto;height:150%;
  background:radial-gradient(ellipse 60% 50% at 50% 0%,var(--accent-glow),transparent 70%);
  pointer-events:none;
}
.kicker{
  font-size:.78rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);margin-bottom:14px;
}
.page-head h1{font-size:clamp(2rem,5vw,3rem);font-weight:800;letter-spacing:-.03em;line-height:1.1;margin-bottom:14px;position:relative}
.page-head p.sub{color:var(--text-dim);max-width:620px;margin:0 auto;font-size:1.05rem;position:relative}

/* DOC (prose pages) */
.doc{padding:48px 0 88px}
.doc h1{font-size:2rem;font-weight:800;letter-spacing:-.03em;margin:0 0 10px;line-height:1.15}
.doc h2{font-size:1.45rem;font-weight:700;letter-spacing:-.02em;margin:52px 0 16px;padding-top:28px;border-top:1px solid var(--border)}
.doc h3{font-size:1.1rem;font-weight:700;margin:32px 0 12px}
.doc p{margin:0 0 16px;color:var(--text-dim)}
.doc p strong,.doc li strong{color:var(--text)}
.doc ul,.doc ol{margin:0 0 16px 22px;color:var(--text-dim)}
.doc li{margin-bottom:10px}
.doc a{color:var(--accent)}
.doc a:hover{text-decoration:underline}
.doc code{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:.85em;background:var(--surface-2);border:1px solid var(--border);
  border-radius:6px;padding:2px 6px;color:var(--text);
}
.doc hr{border:none;border-top:1px solid transparent;margin:8px 0}
.doc table{width:100%;border-collapse:collapse;margin:20px 0 26px;font-size:.9rem;display:block;overflow-x:auto}
.doc th,.doc td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border);min-width:120px}
.doc th{font-size:.75rem;text-transform:uppercase;letter-spacing:.07em;color:var(--text-faint);font-weight:600;background:var(--surface)}
.doc td{color:var(--text-dim)}
.doc td code{white-space:nowrap}
.doc blockquote{border-left:3px solid var(--accent);padding:4px 0 4px 18px;margin:0 0 16px;color:var(--text-dim);font-style:italic}
.doc-meta{
  background:var(--surface);border:1px solid var(--border);border-radius:14px;
  padding:18px 22px;margin:24px 0 8px;font-size:.88rem;color:var(--text-dim);
}

/* CALCULATOR */
.calc-wrap{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:44px 0;align-items:start}
@media(max-width:840px){.calc-wrap{grid-template-columns:1fr}}
.calc-card{
  background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:30px;
}
.calc-card h2{font-size:1.05rem;font-weight:700;margin-bottom:20px;border:none;padding:0}
.field{margin-bottom:18px}
.field label{display:block;font-size:.82rem;font-weight:600;color:var(--text-dim);margin-bottom:7px}
.field input,.field select{
  width:100%;background:var(--surface-2);border:1px solid var(--border);border-radius:12px;
  padding:12px 14px;color:var(--text);font-size:1rem;font-family:inherit;outline:none;
  transition:border-color .15s;
}
.field input:focus,.field select:focus{border-color:var(--accent)}
.field .hint{font-size:.75rem;color:var(--text-faint);margin-top:5px}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.calc-btn{
  width:100%;background:var(--accent);color:#000;border:none;border-radius:12px;
  padding:13px;font-size:1rem;font-weight:700;font-family:inherit;cursor:pointer;
  transition:filter .15s;margin-top:6px;
}
.calc-btn:hover{filter:brightness(1.1)}
.bill-row{display:grid;grid-template-columns:1.4fr 1fr 38px;gap:10px;margin-bottom:10px}
.bill-row input{width:100%;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;padding:10px 12px;color:var(--text);font-size:.92rem;font-family:inherit;outline:none}
.bill-row button{
  background:var(--surface-2);border:1px solid var(--border);border-radius:10px;color:var(--text-faint);
  cursor:pointer;font-size:1rem;
}
.bill-row button:hover{color:#ff453a;border-color:#ff453a}
.add-row{
  background:none;border:1px dashed var(--border);border-radius:10px;color:var(--text-dim);
  padding:10px;width:100%;cursor:pointer;font-family:inherit;font-size:.85rem;margin-bottom:14px;
}
.add-row:hover{border-color:var(--accent);color:var(--accent)}

/* RESULT */
.result-card{
  background:linear-gradient(135deg,rgba(48,209,88,.10),rgba(10,132,255,.05));
  border:1px solid rgba(48,209,88,.28);border-radius:20px;padding:30px;position:sticky;top:84px;
}
.result-card .r-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--text-dim);margin-bottom:6px}
.result-card .r-big{font-size:2.6rem;font-weight:800;letter-spacing:-.03em;line-height:1.1}
.result-card .r-big.warn{color:#ff9f0a}
.result-card .r-big.bad{color:#ff453a}
.result-card .r-sub{font-size:.88rem;color:var(--text-dim);margin-top:6px}
.r-breakdown{margin-top:22px;border-top:1px solid rgba(48,209,88,.2);padding-top:16px}
.r-line{display:flex;justify-content:space-between;font-size:.9rem;padding:7px 0;color:var(--text-dim)}
.r-line b{color:var(--text);font-weight:600}
.r-line.total{border-top:1px solid rgba(48,209,88,.2);margin-top:6px;padding-top:12px}
.month-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:20px}
@media(max-width:500px){.month-grid{grid-template-columns:repeat(2,1fr)}}
.month-cell{
  background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:12px;text-align:center;font-size:.85rem;color:var(--text-dim);
}
.month-cell.hit{
  background:rgba(48,209,88,.12);border-color:rgba(48,209,88,.4);color:var(--text);
}
.month-cell .n{display:block;font-weight:700;font-size:1.05rem}
.month-cell.hit .n{color:var(--accent)}
.month-cell small{font-size:.68rem}

/* APP CTA BAND */
.app-cta{
  background:var(--surface);border:1px solid var(--border);border-radius:20px;
  padding:36px;text-align:center;margin:56px 0 72px;position:relative;overflow:hidden;
}
.app-cta::before{
  content:'';position:absolute;inset:auto -20% -80%;height:130%;
  background:radial-gradient(ellipse 55% 50% at 50% 100%,var(--accent-glow),transparent 70%);
  pointer-events:none;
}
.app-cta h2{font-size:1.5rem;font-weight:800;letter-spacing:-.02em;margin-bottom:10px;border:none;padding:0;position:relative}
.app-cta p{color:var(--text-dim);max-width:560px;margin:0 auto 24px;font-size:.95rem;position:relative}
.store-badges{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;position:relative}
.store-badge{
  display:flex;align-items:center;gap:11px;
  background:#fff;color:#000;border-radius:12px;padding:10px 22px;
  transition:transform .15s;text-align:left;
}
.store-badge:hover{transform:translateY(-2px)}
.store-badge svg{width:26px;height:26px;flex-shrink:0}
.store-badge .lines small{display:block;font-size:.66rem;font-weight:500;opacity:.7;line-height:1.2}
.store-badge .lines span{display:block;font-size:1.02rem;font-weight:700;line-height:1.25;letter-spacing:-.01em}

/* TOOL CARDS (tools index) */
.tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:44px 0 72px}
@media(max-width:700px){.tool-grid{grid-template-columns:1fr}}
.tool-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:28px;transition:border-color .2s,transform .2s;display:block;
}
.tool-card:hover{border-color:var(--accent);transform:translateY(-3px)}
.tool-card .icon{font-size:1.6rem;margin-bottom:14px;display:block}
.tool-card h3{font-size:1.1rem;font-weight:700;margin-bottom:8px}
.tool-card p{font-size:.9rem;color:var(--text-dim)}
.tool-card .go{display:inline-block;margin-top:14px;color:var(--accent);font-weight:600;font-size:.88rem}

.disclaimer{font-size:.78rem;color:var(--text-faint);text-align:center;max-width:640px;margin:0 auto 56px}

/* FOOTER */
footer.site-foot{border-top:1px solid var(--border);padding:44px 0;font-size:.85rem;color:var(--text-faint)}
.foot-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:18px}
.foot-links{display:flex;gap:24px;flex-wrap:wrap}
.foot-links a:hover{color:var(--text)}