/* Светлая тема — база. Тёмная переопределяет только токены. */
:root{
  --ink:#1a1a1a; --mut:#666; --line:#e2e2e4;
  --bg:#fff; --card:#fff; --soft:#f6f6f7;
  --acc:#0a6b3d; --on-acc:#fff;
  --warn:#8a6d00; --warn-soft:#fdf6e0;
  --w:44rem;
}
/* Системная тёмная — если пользователь явно не выбрал светлую */
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --ink:#e6e6e9; --mut:#9b9ba3; --line:#2e2e35;
    --bg:#15151a; --card:#1c1c22; --soft:#1c1c22;
    --acc:#4ade80; --on-acc:#0c1f14;
    --warn:#e3bd4a; --warn-soft:#2b2412;
  }
}
/* Явный выбор пользователя перебивает систему в обе стороны */
:root[data-theme="dark"]{
  --ink:#e6e6e9; --mut:#9b9ba3; --line:#2e2e35;
  --bg:#15151a; --card:#1c1c22; --soft:#1c1c22;
  --acc:#4ade80; --on-acc:#0c1f14;
  --warn:#e3bd4a; --warn-soft:#2b2412;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;color-scheme:light dark}
:root[data-theme="light"]{color-scheme:light}
:root[data-theme="dark"]{color-scheme:dark}
body{margin:0;background:var(--bg);color:var(--ink);
  font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
.wrap{max-width:var(--w);margin:0 auto;padding:0 1rem}

header.site{border-bottom:1px solid var(--line);padding:.9rem 0;margin-bottom:1.6rem}
header.site .wrap{display:flex;align-items:center;gap:.7rem}
header.site a.logo{font-weight:700;font-size:1.05rem;color:var(--ink);text-decoration:none;letter-spacing:-.02em}
header.site .tag{color:var(--mut);font-size:.82rem;flex:1}
#theme{margin-left:auto;flex:none;width:2.2rem;height:2.2rem;padding:0;
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--line);border-radius:8px;background:var(--card);
  color:var(--ink);cursor:pointer;line-height:1}
#theme:hover{border-color:var(--acc);color:var(--acc)}
#theme svg{width:1.05rem;height:1.05rem;fill:none;stroke:currentColor;stroke-width:1.8;
  stroke-linecap:round;stroke-linejoin:round}
:root[data-theme="dark"] #theme .i-sun,
:root:not([data-theme="light"]) #theme .i-sun{display:inline}
#theme .i-sun{display:none}
#theme .i-moon{display:inline}
:root[data-theme="dark"] #theme .i-moon{display:none}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) #theme .i-moon{display:none}
  :root:not([data-theme="light"]) #theme .i-sun{display:inline}
}
:root[data-theme="light"] #theme .i-sun{display:none}
:root[data-theme="light"] #theme .i-moon{display:inline}

.crumbs{font-size:.85rem;color:var(--mut);margin:0 0 .6rem}
.crumbs a{color:var(--mut);text-decoration:none;border-bottom:1px dotted var(--line)}
.crumbs a:hover{color:var(--acc)}
.crumbs span{color:var(--mut)}
h1{font-size:1.75rem;line-height:1.25;letter-spacing:-.02em;margin:0 0 .8rem}
h2{font-size:1.25rem;line-height:1.3;margin:2.2rem 0 .7rem;letter-spacing:-.01em}
h3{font-size:1.02rem;margin:1.4rem 0 .4rem}
p{margin:0 0 .9rem}
.lead{font-size:1.06rem}
a{color:var(--acc)}

table{border-collapse:collapse;width:100%;font-size:.94rem;margin:0}
.tw{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:.6rem 0 1rem}
th,td{border:1px solid var(--line);padding:.45rem .6rem;text-align:left;vertical-align:top}
th{background:var(--soft);font-weight:600}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}

.calc{border:1px solid var(--line);border-radius:12px;padding:1.1rem;background:var(--soft);margin:1.2rem 0}
.calc .tabs{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:.9rem}
.calc .tabs button{border:1px solid var(--line);background:var(--card);border-radius:99px;
  padding:.35rem .85rem;font:inherit;font-size:.9rem;cursor:pointer;color:var(--ink)}
.calc .tabs button[aria-pressed=true]{background:var(--acc);border-color:var(--acc);color:var(--on-acc)}
.calc .row{display:flex;align-items:center;gap:.6rem;margin:.45rem 0}
.calc .row label{flex:1;font-size:.94rem}
.calc .row input,.calc .row select{width:8.5rem;padding:.4rem .5rem;border:1px solid var(--line);
  border-radius:7px;font:inherit;font-size:.94rem;background:var(--card);color:var(--ink)}
.out{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:.9rem 1rem;margin-top:1rem}
.out .big{font-size:1.45rem;font-weight:700;letter-spacing:-.02em}
.out .big span{font-weight:400;font-size:1rem;color:var(--mut)}
.out ul{margin:.6rem 0 0;padding-left:1.1rem}
.out li{margin:.22rem 0}
.note{background:var(--warn-soft);border-left:3px solid var(--warn);padding:.6rem .85rem;
  margin:.9rem 0;font-size:.94rem;border-radius:0 7px 7px 0}
.faq dt{font-weight:600;margin-top:1rem}
.faq dd{margin:.25rem 0 0}
footer.site{border-top:1px solid var(--line);margin-top:3rem;padding:1.2rem 0 2.5rem;
  color:var(--mut);font-size:.85rem}
@media(max-width:640px){
  body{font-size:16px}
  h1{font-size:1.45rem}
  header.site .tag{display:none}
  .calc .row{flex-wrap:wrap}
  .calc .row input,.calc .row select{width:100%}
}

/* ---------- главная: плитки калькуляторов ---------- */
.hero{margin:0 0 1.8rem}
.hero h1{font-size:2.1rem;margin:0 0 .5rem}
.hero p{font-size:1.08rem;color:var(--ink);max-width:38rem;margin:0}
.sec{margin:2rem 0 0}
.sec h2{font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;color:var(--mut);
  margin:0 0 .7rem;font-weight:600}
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.7rem}
.card{display:flex;flex-direction:column;gap:.35rem;border:1px solid var(--line);
  border-radius:12px;padding:.85rem .95rem;background:var(--card);text-decoration:none;
  color:inherit;transition:border-color .12s,transform .12s}
.card:hover{border-color:var(--acc);transform:translateY(-1px)}
.card .badge{align-self:flex-start;font-size:.72rem;font-weight:700;letter-spacing:.02em;
  color:var(--on-acc);background:var(--acc);border-radius:99px;padding:.14rem .5rem}
.card .t{font-weight:650;font-size:1.02rem;line-height:1.25;letter-spacing:-.01em}
.card .d{font-size:.86rem;color:var(--mut);line-height:1.4}
.why{margin-top:2.4rem;border-top:1px solid var(--line);padding-top:1.4rem}
.why h2{font-size:1.15rem;margin:0 0 .6rem}
.why p{max-width:38rem}
@media(max-width:640px){
  .hero h1{font-size:1.6rem}
  .grid{grid-template-columns:1fr}
}

/* ---------- теги-разделы в шапке ---------- */
header.site .nv{margin-top:.6rem;gap:.4rem;flex-wrap:wrap;position:relative}
.nv .nv-one,.nv summary{
  display:inline-block;padding:.28rem .65rem;border:1px solid var(--line);
  border-radius:999px;background:var(--card);color:var(--mut);
  font-size:.83rem;line-height:1.3;cursor:pointer;-webkit-user-select:none;user-select:none;
  text-decoration:none;white-space:nowrap;list-style:none}
.nv summary::-webkit-details-marker{display:none}
.nv summary::marker{content:""}
.nv summary::after{content:"▾";margin-left:.3rem;font-size:.7em;opacity:.75}
.nv .nv-one:hover,.nv summary:hover{border-color:var(--acc);color:var(--acc)}
.nv .nv-one.a,.nv .nv-g.a>summary,.nv .nv-g[open]>summary{
  border-color:var(--acc);color:var(--acc);background:var(--soft)}
.nv .nv-g{position:relative}
.nv .nv-m{position:absolute;z-index:20;top:calc(100% + .35rem);left:0;min-width:11rem;
  display:flex;flex-direction:column;padding:.3rem;
  border:1px solid var(--line);border-radius:10px;background:var(--card);
  box-shadow:0 10px 26px rgba(0,0,0,.14)}
.nv .nv-m a{padding:.42rem .55rem;border-radius:7px;color:var(--ink);
  text-decoration:none;font-size:.9rem;white-space:nowrap}
.nv .nv-m a:hover{background:var(--soft);color:var(--acc)}
.nv .nv-m a[aria-current]{color:var(--acc);font-weight:600}
@media(max-width:640px){
  /* выпадайка на узком экране растягивается по ширине шапки, иначе уезжает за край */
  .nv .nv-g{position:static}
  .nv .nv-m{left:1rem;right:1rem;min-width:0}
}

/* ---------- форма поправок ---------- */
.fix{margin:.5rem 0 1.4rem;font-size:.87rem}
.fix a{color:var(--mut);text-decoration:none;border-bottom:1px dotted var(--line)}
.fix a:hover{color:var(--acc);border-bottom-color:var(--acc)}
.fx{display:flex;flex-direction:column;gap:.35rem;margin:1.4rem 0 2rem;
  padding:1.1rem;border:1px solid var(--line);border-radius:12px;background:var(--soft)}
.fx-i{margin:0 0 .6rem;color:var(--mut);font-size:.9rem}
.fx label{font-size:.86rem;color:var(--mut);margin-top:.55rem}
.fx select,.fx input[type=text],.fx textarea{
  font:inherit;font-size:.95rem;padding:.5rem .6rem;border:1px solid var(--line);
  border-radius:8px;background:var(--card);color:var(--ink);width:100%}
.fx textarea{resize:vertical;min-height:6rem;line-height:1.5}
.fx select:focus,.fx input:focus,.fx textarea:focus{outline:2px solid var(--acc);outline-offset:1px;border-color:var(--acc)}
.fx-h{margin:.35rem 0 0;color:var(--mut);font-size:.82rem}
.fx-hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.fx button{margin-top:1rem;align-self:flex-start;font:inherit;font-size:.95rem;
  padding:.55rem 1.1rem;border:0;border-radius:999px;cursor:pointer;
  background:var(--acc);color:var(--on-acc)}
.fx button:hover{filter:brightness(1.08)}
.fx button:disabled{opacity:.55;cursor:default}
.fx-m{margin:.7rem 0 0;font-size:.88rem;min-height:1.2em}
.fx-m.ok{color:var(--acc)}
.fx-m.err{color:var(--warn)}
footer.site a{color:var(--mut)}
footer.site a:hover{color:var(--acc)}

.ex{border:1px solid var(--line);border-radius:10px;padding:.75rem .95rem;margin:.9rem 0}
.ex h3{margin:0 0 .45rem;font-size:1.02rem;line-height:1.35}
.ex .step{margin:.2rem 0;color:var(--mut)}
.ex .ans{margin:.5rem 0 0;font-weight:600}