/* Интерактивные блоки. Используют переменные темы, поэтому подходят к любой. */
/* ---------- 1. Сборка при прокрутке ---------- */
.build{position:relative}
.build__sticky{position:sticky;top:0;min-height:100vh;display:grid;grid-template-columns:1fr 1.1fr;align-items:center;gap:36px;max-width:1140px;margin:0 auto;padding:28px 18px}
.build__text h1{margin-bottom:.35em}
.build__lead{font-size:18px;color:var(--ink-2);max-width:470px}
.build__steps{list-style:none;padding:0;margin:22px 0 0;border-left:2px solid var(--line-2)}
.build__steps li{padding:7px 0 7px 18px;margin-left:-2px;border-left:2px solid transparent;color:var(--ink-2);transition:color .25s,border-color .25s;font-size:16px}
.build__steps li b{display:block;font-family:Bitter,serif;font-size:17px;color:var(--ink-2);transition:color .25s}
.build__steps li.on{border-left-color:var(--amber);color:var(--ink)}
.build__steps li.on b{color:var(--green)}
.build__stage{background:var(--white);border:1px solid var(--line-2);border-radius:4px;padding:18px;background-image:var(--soty)}
.build__stage svg{display:block;width:100%;height:auto}
.build__hint{margin:12px 0 0;font-size:13px;text-transform:uppercase;letter-spacing:.07em;color:var(--ink-2);text-align:center;transition:opacity .4s}
.build__hint.off{opacity:0}
.build__spacer{height:240vh}
.bp{opacity:0;transform:translateY(12px);transition:opacity .5s ease-out,transform .5s ease-out}
.bp.on{opacity:1;transform:none}
.bp--pc{transition:opacity .7s ease-out}

/* ---------- 2. Формы с перетеканием ---------- */
.shapes{background:var(--bg-2);background-image:var(--soty);padding:78px 0;box-shadow:inset 0 1px 0 var(--line-2),inset 0 -1px 0 var(--line-2)}
.shapes__lead{max-width:720px;color:var(--ink-2);margin-bottom:28px}
.shapes__box{display:grid;grid-template-columns:1.15fr 1fr;gap:28px;align-items:start}
.shapes__stage{background:var(--white);border:1px solid var(--line-2);border-radius:4px;padding:20px;color:var(--green)}
.shapes__stage svg{display:block;width:100%;height:auto}
.shapes__tabs{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px;padding-top:16px;border-top:1px solid var(--line)}
.shapes__tabs button{font:inherit;font-size:15px;font-weight:500;padding:9px 15px;min-height:44px;border:1px solid var(--line-2);background:var(--white);color:var(--ink);border-radius:4px;cursor:pointer;transition:background .15s,border-color .15s,color .15s}
.shapes__tabs button:hover{border-color:var(--green)}
.shapes__tabs button[aria-selected=true]{background:var(--green);border-color:var(--green);color:#fff}
.shapes__tabs button:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
.shapes__info h3{font-size:25px;margin-bottom:4px}
.shapes__models{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--amber);margin-bottom:16px}
.shapes__facts{display:grid;gap:0;margin:0 0 18px;border-top:1px solid var(--line-2)}
.shapes__facts div{display:flex;justify-content:space-between;gap:14px;padding:10px 0;border-bottom:1px solid var(--line)}
.shapes__facts dt{color:var(--ink-2);font-size:15px;margin:0}
.shapes__facts dd{margin:0;font-family:Bitter,serif;font-size:17px}


/* ---------- Рост внутри ---------- */
.height{padding:78px 0}
.height__lead{max-width:720px;color:var(--ink-2);margin-bottom:26px}
.height__box{display:grid;grid-template-columns:1.2fr 1fr;gap:28px;align-items:start}
.height__stage{background:var(--white);border:1px solid var(--line-2);border-radius:4px;padding:20px;color:var(--green)}
.height__stage svg{display:block;width:100%;height:auto}
.height__tabs{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px;padding-top:16px;border-top:1px solid var(--line)}
.height__tabs button{font:inherit;font-size:15px;font-weight:500;padding:9px 15px;min-height:44px;border:1px solid var(--line-2);background:var(--white);color:var(--ink);border-radius:4px;cursor:pointer;transition:background .15s,border-color .15s,color .15s}
.height__tabs button[aria-selected=true]{background:var(--green);border-color:var(--green);color:#fff}
.height__tabs button:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
.height__info h3{font-size:24px;margin-bottom:10px}
.height__verdict{font-family:Bitter,serif;font-size:19px;margin:0 0 12px}
.height__verdict.good{color:var(--green)}
.height__verdict.so-so{color:var(--amber)}
.height__ctl{display:flex;align-items:center;gap:14px;background:var(--bg-2);border:1px solid var(--line-2);border-radius:4px;padding:14px 16px;margin-bottom:16px;flex-wrap:wrap}
.height__ctl label{font-weight:600;white-space:nowrap}
.height__ctl input{flex:1;min-width:150px;accent-color:var(--green);height:28px}
.height__ctl output{font-family:Bitter,serif;font-size:21px;min-width:80px;text-align:right;font-variant-numeric:tabular-nums}

/* ---------- Сезон ---------- */
.season{background:var(--bg-2);background-image:var(--soty);padding:78px 0;box-shadow:inset 0 1px 0 var(--line-2),inset 0 -1px 0 var(--line-2)}
.season__lead{max-width:720px;color:var(--ink-2);margin-bottom:26px}
.season__line{display:grid;grid-template-columns:repeat(12,1fr);gap:3px;background:var(--white);border:1px solid var(--line-2);border-radius:4px;padding:3px;overflow:hidden}
.mon{padding:14px 4px 22px;text-align:center;border-radius:2px;position:relative}
.mon b{display:block;font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.04em}
.mon i{display:block;font-style:normal;font-size:11px;margin-top:3px;opacity:.75}
.mon.q{background:#eef1ea;color:var(--ink-2)}
.mon.w{background:#e5ecd9;color:#4a5a35}
.mon.h{background:var(--amber);color:#fff}
.mon.now{outline:3px solid var(--green);outline-offset:-3px;z-index:1}
.mon.now::after{content:"сейчас";position:absolute;left:50%;transform:translateX(-50%);bottom:5px;font-size:9px;letter-spacing:.06em;text-transform:uppercase;color:var(--green);font-weight:700}
.season__cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(248px,1fr));gap:16px;margin-top:20px}
.season__card{background:var(--white);border:1px solid var(--line-2);border-radius:4px;padding:18px}
.season__card.on{border-color:var(--green);border-top:3px solid var(--green)}
.season__card b{display:block;font-family:Bitter,serif;font-size:18px;margin-bottom:5px}
.season__card p{margin:0;font-size:15px;color:var(--ink-2)}
.season__now{margin-top:20px;background:var(--green-d);color:#fff;border-radius:4px;padding:20px 22px;background-image:var(--soty)}
.season__now b{font-family:Bitter,serif;font-size:20px;display:block;margin-bottom:6px}
.season__now p{margin:0;color:#cfe0d4}

/* ---------- Поликарбонат ---------- */
.pc{padding:78px 0}
.pc__lead{max-width:720px;color:var(--ink-2);margin-bottom:26px}
.pc__box{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
.pc__controls{background:var(--white);border:1px solid var(--line-2);border-radius:4px;padding:22px}
.pc__num{display:flex;align-items:center;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.pc__num label{font-weight:600;min-width:120px}
.pc__num input[type=number]{font:inherit;width:92px;padding:10px 12px;border:1px solid var(--line-2);border-radius:4px;background:#fbf9f2;min-height:44px}
.pc__out{background:var(--green-d);color:#fff;border-radius:4px;padding:24px;background-image:var(--soty)}
.pc__out h3{color:#fff;font-size:21px;margin-bottom:14px}
.pc__sheets{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:16px}
.pc__sheets i{display:block;width:17px;height:46px;background:rgba(255,255,255,.22);border:1px solid rgba(255,255,255,.4);border-radius:2px}

/* ---------- 3. Подбор ---------- */
.calc{padding:78px 0}
.calc__box{display:grid;grid-template-columns:1.05fr 1fr;gap:28px;align-items:start}
.calc__controls{background:var(--white);border:1px solid var(--line-2);border-radius:4px;padding:22px}
.fieldset{border:0;padding:0;margin:0 0 20px}
.fieldset legend{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-2);padding:0;margin-bottom:9px}
.opts{display:flex;gap:8px;flex-wrap:wrap}
.opt{position:relative}
.opt input{position:absolute;opacity:0;width:0;height:0}
.opt span{display:block;padding:10px 16px;border:1px solid var(--line-2);border-radius:4px;cursor:pointer;font-weight:500;transition:background .15s,border-color .15s,color .15s;min-height:44px;display:flex;align-items:center}
.opt input:checked+span{background:var(--green);border-color:var(--green);color:#fff}
.opt input:focus-visible+span{outline:3px solid var(--amber);outline-offset:2px}
.opt input:disabled+span{opacity:.35;cursor:not-allowed}
.calc__out{background:var(--green-d);color:#fff;border-radius:4px;padding:24px;background-image:var(--soty);position:sticky;top:20px}
.calc__out h3{color:#fff;font-size:21px;margin-bottom:14px}
.calc__pic{background:rgba(255,255,255,.08);border-radius:4px;padding:12px;margin-bottom:16px;color:#cfe0cf}
.calc__pic svg{display:block;width:100%;height:auto;max-height:150px}
.row{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:9px 0;border-bottom:1px solid rgba(255,255,255,.16);font-size:15px}
.row:last-of-type{border-bottom:0}
.row b{font-family:Bitter,serif;font-size:23px;font-variant-numeric:tabular-nums;white-space:nowrap}
.row span{color:#bfd0c2}
.calc__total{margin-top:6px;padding-top:12px;border-top:2px solid rgba(255,255,255,.3)}
.calc__hint{font-size:13px;color:#bfd0c2;margin:12px 0 16px}
.calc .btn{width:100%}

@media (max-width:900px){
  .build__sticky{grid-template-columns:1fr;height:auto;position:static;padding-top:40px;padding-bottom:40px}
  .build__spacer{display:none}
  .bp{opacity:1;transform:none}
  .shapes__box,.calc__box,.height__box,.pc__box{grid-template-columns:1fr}
  .season__line{grid-template-columns:repeat(4,1fr)}
  .calc__out{position:static}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .bp{opacity:1;transform:none;transition:none}
}