/* styles.css */
:root{
  --bg: #0f1216;
  --panel: #121822;
  --panel-2: #0f141d;
  --text: #0f141a;
  --text-2: #2b3642;
  --muted: #6b7785;
  --line: rgba(15, 20, 26, 0.12);
  --line-2: rgba(255,255,255,0.10);

  --accent: #f5b400;      /* "строительный" жёлтый */
  --accent-2: #1f3a5f;    /* тёмно‑синий */
  --white: #ffffff;

  --radius: 16px;
  --radius-sm: 12px;

  --shadow: 0 12px 30px rgba(15, 18, 22, 0.10);
  --shadow-2: 0 18px 55px rgba(15, 18, 22, 0.18);

  --container: 1120px;
  --header-h: 76px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Noto Sans", Arial, sans-serif;
  color: var(--text);
  background: #f7f8fa;
  line-height: 1.55;
}
img{ max-width: 100%; height: auto; display: block; }

.container{
  width: min(var(--container), calc(100% - 40px));
  margin-inline: auto;
}

.skip-link{
  position: absolute;
  left: 12px;
  top: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--white);
  border: 1px solid var(--line);
  transform: translateY(-150%);
  transition: transform .2s ease;
  z-index: 1000;
}
.skip-link:focus{ transform: translateY(0); outline: 3px solid rgba(245,180,0,.55); }

.section{
  padding: 74px 0;
  position: relative;
  scroll-margin-top: calc(var(--header-h) + 14px);
}
.section--alt{
  background:
    linear-gradient(0deg, rgba(15,20,26,0.04), rgba(15,20,26,0.04)),
    #ffffff;
  border-top: 1px solid rgba(15,20,26,0.06);
  border-bottom: 1px solid rgba(15,20,26,0.06);
}

.section__head{
  max-width: 820px;
  margin-bottom: 26px;
}
.section__title{
  margin: 0 0 10px;
  font-size: clamp(26px, 2.1vw, 34px);
  letter-spacing: -0.02em;
}
.section__subtitle{
  margin: 0;
  color: var(--text-2);
}

.kicker{
  display: inline-flex;
  gap: 10px;
  align-items: center;
  padding: 6px 10px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  color: rgba(255,255,255,0.86);
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(6px);
  font-weight: 600;
  font-size: 13px;
}
.kicker__dot{
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(245,180,0,0.18);
}

/* Header */
.site-header{
  position: sticky;
  top: 0;
  z-index: 999;
  height: var(--header-h);
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(15,20,26,0.08);
}
.header__inner{
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 18px;
}
.logo{
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
  font-weight: 900;
  letter-spacing: 0.08em;
  font-size: 14px;
  white-space: nowrap;
}
.logo__mark{
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background:
    linear-gradient(145deg, var(--accent), #ffd66d);
  box-shadow: inset 0 0 0 2px rgba(15, 20, 26, 0.12);
  position: relative;
}
.logo__mark::before,
.logo__mark::after{
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(15,20,26,0.28);
}
.logo__mark::after{
  inset: 13px;
  border-color: rgba(15,20,26,0.35);
}

.nav{
  display: flex;
  gap: 14px;
  align-items: center;
  margin-left: auto;
}
.nav__link{
  color: var(--text-2);
  text-decoration: none;
  font-weight: 650;
  font-size: 14px;
  padding: 8px 10px;
  border-radius: 10px;
  transition: background .2s ease, color .2s ease, transform .2s ease;
}
.nav__link:hover{
  color: var(--text);
  background: rgba(15,20,26,0.06);
}
.nav__link:focus-visible{
  outline: 3px solid rgba(245,180,0,.55);
  outline-offset: 2px;
}
.nav__link.is-active{
  color: var(--text);
  background: rgba(245,180,0,0.20);
}

.header__actions{
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-toggle{
  display: none;
  margin-left: auto;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(15,20,26,0.06);
  border: 1px solid rgba(15,20,26,0.10);
  cursor: pointer;
  transition: transform .15s ease, background .2s ease;
}
.nav-toggle:hover{ background: rgba(15,20,26,0.08); }
.nav-toggle:active{ transform: scale(0.98); }
.nav-toggle:focus-visible{ outline: 3px solid rgba(245,180,0,.55); outline-offset: 2px; }
.nav-toggle__lines{
  width: 18px;
  height: 12px;
  margin: 0 auto;
  position: relative;
  display: block;
}
.nav-toggle__lines::before,
.nav-toggle__lines::after,
.nav-toggle__lines{
  background: transparent;
}
.nav-toggle__lines::before,
.nav-toggle__lines::after{
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  border-radius: 4px;
  background: rgba(15,20,26,0.70);
}
.nav-toggle__lines::before{ top: 0; box-shadow: 0 5px 0 rgba(15,20,26,0.70); }
.nav-toggle__lines::after{ bottom: 0; }

/* Buttons */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid transparent;
  font-weight: 750;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
  user-select: none;
}
.btn:focus-visible{ outline: 3px solid rgba(245,180,0,.55); outline-offset: 2px; }
.btn:active{ transform: translateY(1px); }
.btn--full{ width: 100%; }

.btn--primary{
  background: var(--accent);
  color: #11151c;
  border-color: rgba(15,20,26,0.16);
  box-shadow: 0 10px 20px rgba(245,180,0,0.20);
}
.btn--primary:hover{
  box-shadow: 0 14px 28px rgba(245,180,0,0.28);
  transform: translateY(-1px);
}
.btn--ghost{
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.92);
  border-color: rgba(255,255,255,0.16);
}
.section .btn--ghost{
  background: rgba(15,20,26,0.05);
  color: var(--text);
  border-color: rgba(15,20,26,0.14);
}
.section .btn--ghost:hover{
  background: rgba(15,20,26,0.07);
  transform: translateY(-1px);
}

/* Hero */
.hero{
  position: relative;
  padding: 76px 0 64px;
  color: rgba(255,255,255,0.92);
  background:
    radial-gradient(1200px 800px at 10% 20%, rgba(245,180,0,0.16), transparent 55%),
    radial-gradient(900px 600px at 90% 10%, rgba(63,123,197,0.18), transparent 55%),
    linear-gradient(120deg, #0d1219 0%, #111a25 45%, #0d1219 100%);
  overflow: hidden;
}
.hero__bg{
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, rgba(255,255,255,0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(closest-side at 50% 40%, rgba(0,0,0,0.85), transparent 82%);
  opacity: 0.65;
  pointer-events: none;
}
.hero__inner{
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: start;
}
.hero__title{
  margin: 16px 0 10px;
  font-size: clamp(28px, 3vw, 44px);
  letter-spacing: -0.03em;
  line-height: 1.12;
}
.hero__subtitle{
  margin: 0 0 18px;
  color: rgba(255,255,255,0.78);
  max-width: 60ch;
}
.hero__cta{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}
.hero__badges{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
}
.badge{
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.88);
  font-weight: 650;
  font-size: 13px;
}
.badge__icon{
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: rgba(245,180,0,0.14);
  color: var(--accent);
  border: 1px solid rgba(245,180,0,0.20);
}

.hero__panel .panel{
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-2);
}
.panel__head{
  padding: 18px 18px 10px;
}
.panel__title{
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: 16px;
}
.panel__hint{
  color: rgba(255,255,255,0.72);
  font-size: 13px;
  margin-top: 4px;
}
.panel__foot{
  padding: 0 18px 16px;
  opacity: .7;
}
.tech-line{
  height: 1px;
  background: rgba(255,255,255,0.14);
  margin: 14px 0 12px;
}
.tech-grid{
  height: 26px;
  border-radius: 10px;
  border: 1px dashed rgba(255,255,255,0.18);
  background:
    linear-gradient(to right, rgba(255,255,255,0.10) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 14px 14px;
}

.mini-form{
  padding: 0 18px 16px;
  display: grid;
  gap: 12px;
}
.form-note{
  margin: 0;
  color: rgba(255,255,255,0.70);
  font-size: 12px;
}

/* Forms */
.field{ display: grid; gap: 6px; }
label{ font-weight: 700; font-size: 13px; color: inherit; }
input, textarea{
  width: 100%;
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid rgba(15,20,26,0.16);
  background: rgba(255,255,255,0.92);
  color: var(--text);
  outline: none;
  transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
}
.hero input{ background: rgba(255,255,255,0.90); border-color: rgba(255,255,255,0.20); }
textarea{ resize: vertical; min-height: 110px; }
input:focus, textarea:focus{
  border-color: rgba(245,180,0,0.75);
  box-shadow: 0 0 0 4px rgba(245,180,0,0.22);
}
.help{
  font-size: 12px;
  color: var(--muted);
}
.error{
  font-size: 12px;
  color: #b42318;
  min-height: 16px;
}
.muted{ color: var(--muted); }

/* About */
.about-grid{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.about-card{
  background: var(--white);
  border: 1px solid rgba(15,20,26,0.08);
  border-radius: var(--radius);
  padding: 18px 18px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.about-card::after{
  content: "";
  position: absolute;
  inset: -60px -60px auto auto;
  width: 160px;
  height: 160px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, rgba(245,180,0,0.30), transparent 62%);
  opacity: 0.65;
}
.about-card h3{ margin: 0 0 8px; letter-spacing: -0.01em; }
.about-card p{ margin: 0; color: var(--text-2); }

/* Cards (services) */
.cards-grid{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.card{
  background: var(--white);
  border: 1px solid rgba(15,20,26,0.08);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .25s ease, border-color .25s ease;
  position: relative;
  overflow: hidden;
}
.card::before{
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, rgba(15,20,26,0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15,20,26,0.05) 1px, transparent 1px);
  background-size: 52px 52px;
  opacity: 0.16;
  pointer-events: none;
}
.card:hover{
  transform: translateY(-2px);
  box-shadow: 0 18px 45px rgba(15,18,22,0.14);
  border-color: rgba(245,180,0,0.42);
}
.card__icon{
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: var(--accent-2);
  background: rgba(31,58,95,0.08);
  border: 1px solid rgba(31,58,95,0.12);
  margin-bottom: 10px;
  position: relative;
}
.card__title{ margin: 0 0 6px; letter-spacing: -0.01em; }
.card__text{ margin: 0; color: var(--text-2); }

/* Projects */
.projects-grid{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.project{
  background: var(--white);
  border: 1px solid rgba(15,20,26,0.08);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .25s ease, border-color .25s ease;
}
.project:hover{
  transform: translateY(-2px);
  box-shadow: 0 18px 45px rgba(15,18,22,0.14);
  border-color: rgba(245,180,0,0.42);
}
.project__top{ display: grid; gap: 8px; }
.project__tag{
  display: inline-flex;
  width: fit-content;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(245,180,0,0.16);
  border: 1px solid rgba(245,180,0,0.26);
  color: #7a5200;
  font-weight: 800;
  font-size: 12px;
}
.project__title{ margin: 0; letter-spacing: -0.01em; }
.project__desc{ margin: 10px 0 10px; color: var(--text-2); }
.project__meta{
  border-top: 1px solid rgba(15,20,26,0.08);
  padding-top: 10px;
  color: var(--text-2);
  font-size: 13px;
}

/* Calculator */
.calc{
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 14px;
  align-items: start;
}
.calc__form{
  background: var(--white);
  border: 1px solid rgba(15,20,26,0.08);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}
.calc__group{
  border: 0;
  padding: 0;
  margin: 0 0 14px;
}
.calc__group legend{
  font-weight: 800;
  font-size: 13px;
  margin-bottom: 10px;
  padding: 0;
}
.segmented{
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: rgba(15,20,26,0.05);
  border: 1px solid rgba(15,20,26,0.10);
  border-radius: 14px;
  padding: 4px;
  gap: 4px;
}
.segmented__item{
  display: grid;
  place-items: center;
  gap: 0;
  cursor: pointer;
  border-radius: 12px;
  padding: 10px 8px;
  font-weight: 800;
  color: var(--text-2);
  user-select: none;
  position: relative;
  transition: background .2s ease, color .2s ease, transform .15s ease;
}
.segmented__item input{
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.segmented__item:has(input:checked){
  background: rgba(245,180,0,0.22);
  color: var(--text);
  border: 1px solid rgba(245,180,0,0.35);
}
.segmented__item:hover{ transform: translateY(-1px); }

.calc__row{
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 14px;
  align-items: start;
}
.calc__options{
  display: grid;
  gap: 10px;
  padding: 12px;
  border-radius: 14px;
  border: 1px dashed rgba(15,20,26,0.16);
  background:
    linear-gradient(0deg, rgba(15,20,26,0.02), rgba(15,20,26,0.02));
}
.check{
  display: flex;
  gap: 10px;
  align-items: center;
  cursor: pointer;
  user-select: none;
  color: var(--text-2);
  font-weight: 700;
}
.check input{
  width: 18px;
  height: 18px;
  border-radius: 6px;
}
.calc__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.calc__result .result-card{
  background: var(--white);
  border: 1px solid rgba(15,20,26,0.08);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  position: sticky;
  top: calc(var(--header-h) + 16px);
}
.result-card__row{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(15,20,26,0.08);
}
.result-card__row--total{
  border-bottom: 0;
  padding-bottom: 0;
  margin-top: 4px;
}
.result-card__label{
  color: var(--text-2);
  font-weight: 750;
}
.result-card__value{
  font-weight: 900;
  letter-spacing: -0.01em;
}
.result-card__row--total .result-card__value{
  font-size: 22px;
}
.result-card__note{
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
}
.result-card__tech{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
  opacity: 0.8;
}
.tech-chip{
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .10em;
  text-transform: uppercase;
  padding: 6px 8px;
  border-radius: 10px;
  border: 1px solid rgba(15,20,26,0.12);
  background: rgba(15,20,26,0.04);
}

/* Advantages */
.advantages-grid{
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.adv{
  background: var(--white);
  border: 1px solid rgba(15,20,26,0.08);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .25s ease, border-color .25s ease;
}
.adv:hover{
  transform: translateY(-2px);
  box-shadow: 0 18px 45px rgba(15,18,22,0.14);
  border-color: rgba(31,58,95,0.26);
}
.adv__icon{
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: rgba(31,58,95,0.08);
  border: 1px solid rgba(31,58,95,0.12);
  color: var(--accent-2);
  margin-bottom: 10px;
}
.adv h3{ margin: 0 0 6px; letter-spacing: -0.01em; }
.adv p{ margin: 0; color: var(--text-2); }

/* Contacts */
.contacts-grid{
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 14px;
}
.contacts-card,
.form-card{
  background: var(--white);
  border: 1px solid rgba(15,20,26,0.08);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
}
.contacts-card h3,
.form-card h3{
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.contacts-list{
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}
.contacts-list li{
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(15,20,26,0.08);
  background: rgba(15,20,26,0.02);
}
.contacts-list__label{
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 4px;
}
.contacts-list__value{
  color: var(--text);
  font-weight: 850;
  text-decoration: none;
}
.contacts-list__value:hover{ text-decoration: underline; }

.contacts-actions{
  display: flex;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
}

.contacts-tech{
  margin-top: 18px;
  opacity: .6;
}
.thin-rule{
  height: 1px;
  background: rgba(15,20,26,0.10);
  margin-bottom: 12px;
}
.microgrid{
  height: 26px;
  border-radius: 10px;
  border: 1px dashed rgba(15,20,26,0.16);
  background:
    linear-gradient(to right, rgba(15,20,26,0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15,20,26,0.06) 1px, transparent 1px);
  background-size: 14px 14px;
}

.contact-form{ display: grid; gap: 12px; }
.form-actions{ display: flex; gap: 10px; flex-wrap: wrap; }
.form-note{
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}
code{ font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; }

/* Footer */
.footer{
  padding: 26px 0;
  border-top: 1px solid rgba(15,20,26,0.08);
  background: #ffffff;
}
.footer__inner{
  display: flex;
  gap: 16px;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
}
.footer__brand{
  font-weight: 950;
  letter-spacing: 0.05em;
  font-size: 13px;
}
.footer__meta{
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}
.footer__right{
  display: grid;
  justify-items: end;
  gap: 8px;
}
.footer__link{
  color: var(--text-2);
  text-decoration: none;
  font-weight: 750;
}
.footer__link:hover{ text-decoration: underline; }
.footer__sep{ color: var(--muted); }
.footer__copy{ color: var(--muted); font-size: 12px; }

/* Toast */
.toast{
  position: fixed;
  right: 16px;
  bottom: 16px;
  max-width: min(420px, calc(100% - 32px));
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(17, 24, 34, 0.92);
  color: rgba(255,255,255,0.92);
  border: 1px solid rgba(255,255,255,0.14);
  box-shadow: var(--shadow-2);
  transform: translateY(20px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
  z-index: 1000;
}
.toast.is-show{
  opacity: 1;
  transform: translateY(0);
}

/* Reveal animation */
.reveal{
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .45s ease, transform .45s ease;
}
.reveal.is-visible{
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 980px){
  .hero__inner{ grid-template-columns: 1fr; }
  .hero__badges{ grid-template-columns: 1fr; }
  .cards-grid, .projects-grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about-grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .advantages-grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .calc{ grid-template-columns: 1fr; }
  .calc__result .result-card{ position: static; }
  .contacts-grid{ grid-template-columns: 1fr; }
}

@media (max-width: 720px){
  :root{ --header-h: 72px; }
  .section{ padding: 60px 0; }
  .header__actions{ display: none; }
  .nav-toggle{ display: inline-flex; align-items: center; justify-content: center; }
  .nav{
    position: absolute;
    left: 12px;
    right: 12px;
    top: calc(var(--header-h) - 6px);
    background: rgba(255,255,255,0.96);
    border: 1px solid rgba(15,20,26,0.10);
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 10px;
    display: grid;
    gap: 6px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s ease, transform .2s ease;
  }
  .site-header.is-open .nav{
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .nav__link{ padding: 12px 12px; }

  .cards-grid, .projects-grid{ grid-template-columns: 1fr; }
  .about-grid{ grid-template-columns: 1fr; }
  .advantages-grid{ grid-template-columns: 1fr; }
  .calc__row{ grid-template-columns: 1fr; }
  .hero{ padding: 66px 0 54px; }
}