/* ===== ПОРЯДОК — раздел /calc/ ===== */
:root{
  --wine:#4A1023; --wine-1:#5d172e;
  --brass:#B5915A; --brass-1:#a07f49; --brass-2:#8a6e3f;
  --cream:#FBF6EC; --cream-1:#F5EDDC;
  --coal:#1E1A18; --coal-1:#2a2421; --coal-2:#494340;
  --line:#E4D9C5; --muted:#8a7f6e;
  --ok:#4F8A4C; --err:#9A3438;
  --display:'Manrope',-apple-system,system-ui,'Segoe UI',Arial,sans-serif;
  --sans:'Inter',-apple-system,system-ui,'Segoe UI',Arial,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;
  --ease-out:cubic-bezier(.22,1,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:var(--sans);background:var(--cream);color:var(--coal);line-height:1.55;font-size:15.5px;-webkit-font-smoothing:antialiased}
a{color:var(--wine);text-decoration:none;transition:color .14s}
a:hover{color:var(--brass-2)}
img{max-width:100%;display:block}

/* ===== Header ===== */
.calc-nav{position:sticky;top:0;background:rgba(251,246,236,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:100}
.calc-nav-inner{max-width:1760px;margin:0 auto;padding:14px 56px;display:flex;align-items:center;justify-content:space-between;gap:32px}
.calc-brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--coal)}
.calc-brand-mark{width:44px;height:44px;background:var(--wine);color:var(--cream);display:flex;align-items:center;justify-content:center;border-radius:6px;font-family:var(--display);font-weight:800;font-size:16px;letter-spacing:-.02em}
.calc-brand-text{font-family:var(--display);font-weight:800;font-size:18px;color:var(--coal);letter-spacing:-.018em;line-height:1.05}
.calc-brand-text small{display:block;font-family:var(--mono);font-weight:400;font-size:10px;color:var(--coal-2);letter-spacing:.08em;text-transform:uppercase;margin-top:3px}
.calc-nav-links{display:flex;gap:24px;font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--coal-2)}
.calc-nav-links a{color:var(--coal-2)}
.calc-nav-links a:hover{color:var(--wine)}
.calc-cta{background:var(--wine);color:var(--cream);font-family:var(--display);font-weight:700;font-size:12px;letter-spacing:.06em;text-transform:uppercase;padding:10px 18px;border-radius:4px;transition:background .14s}
.calc-cta:hover{background:var(--wine-1);color:var(--cream)}

/* ===== Hero (одно-экранный) ===== */
.calc-hero{max-width:1760px;margin:0 auto;padding:40px 56px 32px}
.calc-crumb{display:inline-flex;align-items:center;gap:10px;padding:7px 14px;margin-bottom:22px;background:#fff;border:1px solid var(--line);border-radius:999px;font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;color:var(--coal-2);text-transform:uppercase;line-height:1}
.calc-crumb a{color:var(--coal-2)}
.calc-crumb .sep{color:var(--brass-1);opacity:.5;font-weight:700}
.calc-crumb .current{color:var(--coal);font-weight:700}
.calc-hero h1{font-family:var(--display);font-weight:800;font-size:42px;letter-spacing:-.025em;line-height:1.05;color:var(--coal);margin:0 0 16px;max-width:880px}
.calc-hero .lead{font-size:17px;line-height:1.55;color:var(--coal-2);max-width:720px;margin:0}

/* ===== Калькулятор ===== */
.calc-shell{max-width:1760px;margin:0 auto;padding:0 56px 32px}
.calc-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:24px;align-items:start;margin-bottom:48px}
.calc-card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:28px}
.calc-card h2{font-family:var(--display);font-weight:700;font-size:14px;letter-spacing:.04em;text-transform:uppercase;color:var(--brass-2);margin:0 0 22px}
.calc-card h2 .step{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;background:var(--wine);color:var(--cream);border-radius:50%;font-family:var(--mono);font-size:11px;font-weight:700;margin-right:8px;vertical-align:-2px}
.calc-row{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;padding:14px 0;border-bottom:1px dashed var(--line)}
.calc-row:last-child{border-bottom:0}
.calc-row label{font-size:14px;color:var(--coal);line-height:1.3}
.calc-row label small{display:block;font-family:var(--mono);font-size:10.5px;color:var(--muted);letter-spacing:.04em;margin-top:3px;text-transform:none}
.calc-input{display:flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:4px;background:var(--cream-1);padding:0 12px;transition:border-color .14s,background .14s}
.calc-input:focus-within{border-color:var(--wine);background:#fff}
.calc-input input{border:0;background:transparent;font-family:var(--display);font-weight:700;font-size:16px;color:var(--coal);width:120px;padding:10px 0;text-align:right;outline:none}
.calc-input input::-webkit-outer-spin-button,.calc-input input::-webkit-inner-spin-button{-webkit-appearance:none}
.calc-input input[type=number]{-moz-appearance:textfield}
.calc-input .suffix{font-family:var(--mono);font-size:11px;color:var(--brass-2);letter-spacing:.04em}

/* ===== Результат ===== */
.calc-result{background:var(--coal);color:var(--cream);border:1px solid var(--coal-1);border-radius:8px;padding:28px;position:sticky;top:80px}
.calc-result h2{font-family:var(--display);font-weight:700;font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--brass);margin:0 0 22px}
.calc-out{display:grid;gap:14px;margin-bottom:24px}
.calc-out-row{display:flex;justify-content:space-between;align-items:baseline;gap:14px;padding-bottom:14px;border-bottom:1px dashed rgba(229,217,197,.18)}
.calc-out-row:last-child{border-bottom:0}
.calc-out-label{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--brass);line-height:1.4}
.calc-out-value{font-family:var(--display);font-weight:800;font-size:24px;color:var(--cream);text-align:right;letter-spacing:-.01em}
.calc-out-value.big{font-size:36px}
.calc-out-value.warn{color:#E89A6E}
.calc-out-value.good{color:#9ED98F}
.calc-out-value.err{color:#E37A7A}
.calc-verdict{padding:14px 18px;background:rgba(181,145,90,.12);border-left:3px solid var(--brass);font-size:13.5px;line-height:1.55;color:rgba(251,246,236,.92);border-radius:0 4px 4px 0}
.calc-verdict.warn{background:rgba(232,154,110,.12);border-left-color:#E89A6E}
.calc-verdict.err{background:rgba(227,122,122,.12);border-left-color:#E37A7A}
.calc-verdict b{color:var(--cream)}

/* ===== Объяснение ===== */
.calc-explain{background:#fff;border:1px solid var(--line);border-radius:8px;padding:32px;margin-bottom:24px}
.calc-explain h3{font-family:var(--display);font-weight:800;font-size:22px;letter-spacing:-.015em;color:var(--coal);margin:0 0 14px;padding-left:14px;border-left:3px solid var(--wine)}
.calc-explain p{font-size:15px;line-height:1.65;color:var(--coal-2);margin:0 0 14px;max-width:780px}
.calc-formula{background:var(--cream-1);border:1px solid var(--line);border-radius:4px;padding:14px 18px;font-family:var(--mono);font-size:13.5px;color:var(--coal);margin:14px 0;line-height:1.55}
.calc-formula b{color:var(--wine)}
.calc-explain ul{padding-left:18px;margin:10px 0}
.calc-explain li{margin-bottom:8px;line-height:1.55;color:var(--coal-2)}

/* ===== FAQ ===== */
.calc-faq{background:#fff;border:1px solid var(--line);border-radius:8px;padding:32px;margin-bottom:24px}
.calc-faq h3{font-family:var(--display);font-weight:800;font-size:22px;letter-spacing:-.015em;color:var(--coal);margin:0 0 18px;padding-left:14px;border-left:3px solid var(--wine)}
.calc-faq details{border-bottom:1px solid var(--line);padding:14px 0}
.calc-faq details:last-child{border-bottom:0}
.calc-faq summary{cursor:pointer;font-family:var(--display);font-weight:600;font-size:15.5px;color:var(--coal);list-style:none;display:flex;justify-content:space-between;align-items:center;gap:14px}
.calc-faq summary::-webkit-details-marker{display:none}
.calc-faq summary::after{content:'+';font-family:var(--mono);font-size:18px;color:var(--brass-2);transition:transform .2s}
.calc-faq details[open] summary::after{content:'–'}
.calc-faq .answer{margin-top:10px;color:var(--coal-2);line-height:1.65;font-size:14.5px;max-width:780px}

/* ===== CTA в марафон ===== */
.calc-marathon{background:linear-gradient(135deg,var(--wine) 0%,var(--coal) 100%);color:var(--cream);border-radius:8px;padding:48px 40px;margin-bottom:48px;display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:48px;align-items:center;border:1px solid var(--coal-1)}
.calc-marathon-text h3{font-family:var(--display);font-weight:800;font-size:30px;letter-spacing:-.018em;line-height:1.1;color:var(--cream);margin:0 0 12px}
.calc-marathon-text p{font-size:15px;line-height:1.55;color:rgba(251,246,236,.78);margin:0 0 22px;max-width:520px}
.calc-marathon-bullets{margin:0 0 22px;padding:0;list-style:none}
.calc-marathon-bullets li{padding:6px 0;color:rgba(251,246,236,.92);font-size:14.5px;display:flex;gap:10px;align-items:flex-start}
.calc-marathon-bullets li::before{content:'→';color:var(--brass);font-weight:700;font-family:var(--mono);flex-shrink:0}
.calc-marathon a.cta{display:inline-block;background:var(--brass);color:var(--coal);font-family:var(--display);font-weight:800;font-size:13.5px;letter-spacing:.06em;text-transform:uppercase;padding:14px 26px;border-radius:4px;transition:background .14s}
.calc-marathon a.cta:hover{background:var(--cream);color:var(--coal)}
.calc-marathon-form{background:rgba(0,0,0,.25);border:1px solid rgba(229,217,197,.18);border-radius:8px;padding:28px}
.calc-marathon-form label{display:block;font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--brass);margin-bottom:6px}
.calc-marathon-form input{width:100%;background:transparent;border:0;border-bottom:1px solid rgba(229,217,197,.3);padding:10px 0;color:var(--cream);font-family:var(--sans);font-size:15px;outline:none;margin-bottom:18px;transition:border-color .14s}
.calc-marathon-form input::placeholder{color:rgba(251,246,236,.4)}
.calc-marathon-form input:focus{border-bottom-color:var(--brass)}
.calc-marathon-form button{width:100%;background:var(--brass);color:var(--coal);font-family:var(--display);font-weight:800;font-size:13px;letter-spacing:.06em;text-transform:uppercase;padding:14px 24px;border:0;border-radius:4px;cursor:pointer;transition:background .14s}
.calc-marathon-form button:hover{background:var(--cream)}
.calc-marathon-form button:disabled{opacity:.5;cursor:wait}
.calc-marathon-form .form-status{margin-top:10px;font-size:12.5px;color:var(--brass);min-height:16px}

/* ===== Other calcs (related) ===== */
.calc-others{margin-bottom:48px}
.calc-others h3{font-family:var(--display);font-weight:800;font-size:22px;letter-spacing:-.015em;color:var(--coal);margin:0 0 18px}
.calc-others-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.calc-other-card{display:block;background:#fff;border:1px solid var(--line);border-radius:6px;padding:20px;transition:all .14s var(--ease-out);text-decoration:none}
.calc-other-card:hover{border-color:var(--brass);transform:translateY(-2px);box-shadow:0 6px 20px rgba(30,26,24,.08)}
.calc-other-card-tag{font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:var(--brass-2);text-transform:uppercase;margin-bottom:8px}
.calc-other-card h4{font-family:var(--display);font-weight:700;font-size:16px;color:var(--coal);margin:0 0 8px;line-height:1.25}
.calc-other-card p{font-size:13.5px;color:var(--coal-2);margin:0;line-height:1.45}

/* ===== Footer ===== */
.calc-footer{background:var(--coal);color:rgba(251,246,236,.7);padding:48px 32px 32px;margin-top:48px}
.calc-footer-inner{max-width:1760px;margin:0 auto;display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr 1fr;gap:48px;margin-bottom:32px}
.calc-footer h5{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--brass);margin:0 0 14px}
.calc-footer a{color:rgba(251,246,236,.7);font-size:14px;display:block;padding:4px 0}
.calc-footer a:hover{color:var(--cream)}
.calc-footer p{font-size:13px;line-height:1.55;color:rgba(251,246,236,.55);margin:0 0 10px}
.calc-footer-bottom{max-width:1760px;margin:0 auto;padding-top:24px;border-top:1px solid rgba(229,217,197,.15);font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:rgba(251,246,236,.45);text-transform:uppercase;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}

@media (max-width:980px){
  .calc-hero h1{font-size:30px}
  .calc-grid{grid-template-columns:1fr;gap:18px}
  .calc-result{position:static}
  .calc-marathon{grid-template-columns:1fr;padding:32px 24px;gap:28px}
  .calc-marathon-text h3{font-size:24px}
  .calc-footer-inner{grid-template-columns:1fr 1fr;gap:28px}
}
@media (max-width:540px){
  .calc-nav-inner{padding:12px 18px;gap:14px}
  .calc-nav-links{display:none}
  .calc-brand-text{font-size:15px}
  .calc-brand-text small{display:none}
  .calc-hero{padding:24px 18px 18px}
  .calc-hero h1{font-size:26px}
  .calc-shell{padding:0 18px 18px}
  .calc-card,.calc-explain,.calc-faq{padding:20px}
  .calc-result{padding:22px}
  .calc-out-value{font-size:20px}
  .calc-out-value.big{font-size:28px}
  .calc-footer-inner{grid-template-columns:1fr}
}