/* Загородный инженер — фирменный стиль сайта.

   Идея оформления: всё, что делает компания, находится под землёй и
   заказчику не видно. Поэтому главный носитель смысла — разрез грунта
   с отметками глубины: он же навигация по услугам, он же ритм страницы.
   Единицы измерения и цены набраны моноширинным — как в чертеже. */

:root {
  --navy: #0c183c;
  --navy-2: #183054;
  --navy-3: #24406a;
  --orange: #fa6418;
  --orange-soft: #ffe3cc;
  --steel: #607890;
  --soil: #e8e2d8;
  --soil-2: #d8cfc0;
  --paper: #ffffff;
  --ink: #0c183c;
  --muted: #5a6a80;
  --line: #d6dee8;

  --display: 'Golos Text', 'Segoe UI', system-ui, sans-serif;
  --body: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'Courier New', monospace;

  --wrap: 1220px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --radius: 14px;
  --shadow: 0 18px 50px -28px rgba(12, 24, 60, .55);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -.02em;
  margin: 0;
  text-wrap: balance;
}
h1 { font-size: clamp(2.4rem, 6.2vw, 4.6rem); }
h2 { font-size: clamp(1.85rem, 4vw, 3rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); font-weight: 700; }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

.wrap { width: min(100% - var(--gutter) * 2, var(--wrap)); margin-inline: auto; }
.section { padding-block: clamp(3.5rem, 8vw, 6.5rem); }
.section--tight { padding-block: clamp(2.5rem, 5vw, 4rem); }
.section--soil { background: var(--soil); }
.section--navy { background: var(--navy); color: #fff; }
.section--navy .lead { color: #b9c6d8; }

.lead { font-size: clamp(1.02rem, 1.6vw, 1.2rem); color: var(--muted); max-width: 62ch; }

/* Метка раздела: отметка глубины, а не декоративный номер. */
.depth-tag {
  font-family: var(--mono);
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--orange);
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  margin-bottom: 1rem;
}
.depth-tag::before {
  content: '';
  width: 34px;
  height: 2px;
  background: var(--orange);
}
.section--navy .depth-tag { color: #ff8a4c; }
.section--navy .depth-tag::before { background: #ff8a4c; }

/* --- Кнопки --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1rem;
  padding: .95rem 1.7rem;
  border-radius: 10px;
  border: 2px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: transform .16s ease, background .16s ease, color .16s ease,
              border-color .16s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--primary { background: var(--orange); color: #fff; }
.btn--primary:hover { background: #e2540c; }
.btn--ghost { border-color: currentColor; color: var(--navy); }
.btn--ghost:hover { background: var(--navy); color: #fff; border-color: var(--navy); }
.section--navy .btn--ghost { color: #fff; }
.section--navy .btn--ghost:hover { background: #fff; color: var(--navy); }

:where(a, button, input, select, textarea, summary):focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --- Шапка --- */
.header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, .93);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header__inner {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.4rem);
  min-height: 76px;
}
.logo { display: flex; align-items: center; gap: .7rem; text-decoration: none; flex: 0 0 auto; }
.logo img { width: 44px; height: 44px; }
.logo__name {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: .01em;
  line-height: 1.05;
  color: var(--navy);
}
.logo__tag {
  display: block;
  font-family: var(--mono);
  font-size: .58rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--orange);
  margin-top: .2rem;
}
.nav { display: flex; gap: clamp(.8rem, 1.8vw, 1.7rem); margin-left: auto; }
.nav a {
  text-decoration: none;
  font-weight: 500;
  font-size: .95rem;
  color: var(--navy-2);
  padding: .35rem 0;
  border-bottom: 2px solid transparent;
}
.nav a:hover, .nav a[aria-current='page'] { border-bottom-color: var(--orange); }
.header__phone {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.02rem;
  text-decoration: none;
  color: var(--navy);
  white-space: nowrap;
}
.header__phone:hover { color: var(--orange); }
.burger {
  display: none;
  background: none;
  border: 0;
  padding: .4rem;
  cursor: pointer;
  color: var(--navy);
}

/* --- Герой: разрез грунта --- */
.hero { position: relative; background: #fff; overflow: hidden; }
.hero__top {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: clamp(1.6rem, 4vw, 3.5rem);
  align-items: start;
  padding-top: clamp(2.4rem, 5.5vw, 4rem);
  padding-bottom: clamp(2rem, 4vw, 3rem);
}
@media (max-width: 960px) { .hero__top { grid-template-columns: 1fr; } }
.hero h1 { max-width: 15ch; }
.hero h1 em { font-style: normal; color: var(--orange); }
.hero__lead { margin-top: 1.3rem; max-width: 48ch; }
.hero__cta { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.hero__note {
  margin-top: 1.1rem;
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--steel);
  letter-spacing: .02em;
}

/* Шкала глубины: список услуг, размеченный по реальной глубине залегания. */
/* Ниже этой линии — грунт. Фон меняется ровно там, где начинается разрез. */
.cut-ground { background: linear-gradient(180deg, var(--soil) 0%, var(--soil-2) 100%); }
.cut { position: relative; padding-block: clamp(1.6rem, 4vw, 2.4rem) clamp(2.5rem, 6vw, 4rem); }
.cut__grade {
  display: flex;
  align-items: baseline;
  gap: .8rem;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--navy-2);
  padding-bottom: .5rem;
  border-bottom: 2px solid var(--navy);
}
.cut__grade span { margin-left: auto; }
.layers { list-style: none; margin: 0; padding: 0; }
.layer {
  position: relative;
  display: grid;
  grid-template-columns: 6.2rem 1fr auto;
  align-items: center;
  gap: clamp(.8rem, 2vw, 1.6rem);
  padding: 1.05rem 0;
  border-bottom: 1px dashed rgba(12, 24, 60, .28);
  text-decoration: none;
  color: inherit;
}
.layer::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background: rgba(255, 255, 255, .55);
  opacity: 0;
  transition: opacity .18s ease;
  pointer-events: none;
  border-radius: 8px;
}
.layer:hover::after, .layer:focus-visible::after { opacity: 1; }
.layer__depth {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(.95rem, 2vw, 1.15rem);
  color: var(--navy);
  position: relative;
  z-index: 1;
}
.layer__depth small {
  display: block;
  font-weight: 400;
  font-size: .62rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--steel);
  margin-top: .15rem;
}
.layer__body { position: relative; z-index: 1; }
.layer__name {
  display: block;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.4vw, 1.45rem);
  line-height: 1.15;
}
.layer__desc { display: block; font-size: .9rem; color: var(--navy-2); margin-top: .25rem; }
.layer__price {
  position: relative;
  z-index: 1;
  font-family: var(--mono);
  font-weight: 500;
  font-size: .88rem;
  color: var(--navy);
  text-align: right;
  white-space: nowrap;
}
.layer__price b { display: block; font-size: 1.02rem; font-weight: 700; }
.layer:hover .layer__name { color: var(--orange); }

/* --- Сетки карточек --- */
.grid { display: grid; gap: 1.2rem; }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(248px, 1fr)); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .6rem;
}
.card--flat { background: transparent; border: 0; padding: 0; }
.section--navy .card { background: var(--navy-2); border-color: rgba(255,255,255,.14); }
.card__eyebrow {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--orange);
}
.card p { color: var(--muted); font-size: .95rem; }
.section--navy .card p { color: #b9c6d8; }

/* --- Процесс: последовательность, поэтому нумерация оправдана --- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.step {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: clamp(1rem, 3vw, 2rem);
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step__no {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--orange);
}
.step h3 { margin-bottom: .35rem; }
.step p { color: var(--muted); font-size: .96rem; }

/* --- Каталог --- */
.filters { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.6rem; }
.filter {
  font-family: var(--display);
  font-weight: 600;
  font-size: .9rem;
  padding: .5rem 1.05rem;
  border-radius: 999px;
  border: 1.5px solid var(--line);
  background: #fff;
  color: var(--navy-2);
  cursor: pointer;
}
.filter[aria-pressed='true'] { background: var(--navy); border-color: var(--navy); color: #fff; }

.product {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem 1.4rem;
  display: flex;
  flex-direction: column;
}
.product__brand {
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--steel);
}
.product__name {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.18rem;
  margin: .2rem 0 .9rem;
  line-height: 1.15;
}
.specs { list-style: none; margin: 0 0 1.1rem; padding: 0; display: grid; gap: .35rem; }
.specs li {
  display: flex;
  justify-content: space-between;
  gap: .8rem;
  font-size: .85rem;
  border-bottom: 1px dotted var(--line);
  padding-bottom: .3rem;
}
.specs dt, .specs .k { color: var(--muted); }
.specs .v { font-family: var(--mono); font-weight: 500; }
.product__foot {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: .8rem 1rem;
}
.price { font-family: var(--mono); }
.price small { display: block; font-size: .66rem; letter-spacing: .08em; text-transform: uppercase; color: var(--steel); }
.price b { font-size: 1.32rem; font-weight: 700; color: var(--navy); white-space: nowrap; }

/* --- Факты без выдумок --- */
.facts { display: grid; gap: 1.4rem; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.fact__value {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(2rem, 4.6vw, 3.1rem);
  line-height: 1;
  color: var(--orange);
}
.fact__label { margin-top: .5rem; font-size: .93rem; color: #b9c6d8; max-width: 24ch; }

/* --- Форма --- */
.form { display: grid; gap: .9rem; }
.field { display: grid; gap: .35rem; }
.field label { font-size: .82rem; font-weight: 500; color: var(--navy-2); }
.field input, .field select, .field textarea {
  font-family: var(--body);
  font-size: 1rem;
  padding: .8rem .95rem;
  border: 1.5px solid var(--line);
  border-radius: 9px;
  background: #fff;
  color: var(--ink);
  width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--orange); outline: none; }
.form__row { display: grid; gap: .9rem; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.form__consent { font-size: .78rem; color: var(--muted); }
.form__consent a { color: var(--navy-2); }
.form__status { font-size: .92rem; font-weight: 500; min-height: 1.4em; }
.form__status[data-state='ok'] { color: #1c7a3e; }
.form__status[data-state='error'] { color: #b3261e; }

.panel {
  background: #fff;
  border-radius: var(--radius);
  padding: clamp(1.4rem, 3vw, 2.2rem);
  box-shadow: var(--shadow);
}

/* --- FAQ --- */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 1.15rem 2.5rem 1.15rem 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.05rem;
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: '+';
  position: absolute;
  right: .4rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 1.4rem;
  color: var(--orange);
}
.faq details[open] summary::after { content: '−'; }
.faq details > *:not(summary) { padding-bottom: 1.2rem; color: var(--muted); max-width: 75ch; }

/* --- Подвал --- */
.footer { background: var(--navy); color: #fff; padding-block: clamp(2.6rem, 6vw, 4rem) 2rem; }
.footer a { color: #cbd6e6; text-decoration: none; }
.footer a:hover { color: #fff; }
.footer__grid { display: grid; gap: 2rem; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.footer h4 {
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #8ea3bd;
  margin: 0 0 .9rem;
}
.footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; font-size: .93rem; }
.footer__legal {
  margin-top: 2.4rem;
  padding-top: 1.4rem;
  border-top: 1px solid rgba(255,255,255,.14);
  font-size: .78rem;
  color: #8ea3bd;
  display: flex;
  flex-wrap: wrap;
  gap: .6rem 1.6rem;
}

/* --- Плавающая кнопка звонка на мобильных --- */
.callbar { display: none; }

.prose h2 { margin-top: 2.4rem; }
.prose h3 { margin-top: 1.8rem; }
.prose ul { padding-left: 1.1rem; color: var(--muted); }
.prose li { margin-bottom: .45rem; }
.prose table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.prose th, .prose td { text-align: left; padding: .6rem .7rem; border-bottom: 1px solid var(--line); }
.prose th { font-family: var(--mono); font-size: .74rem; text-transform: uppercase; letter-spacing: .06em; color: var(--steel); }
.table-scroll { overflow-x: auto; }

@media (max-width: 900px) {
  .nav {
    position: fixed;
    inset: 76px 0 auto;
    background: #fff;
    flex-direction: column;
    gap: 0;
    padding: .6rem var(--gutter) 1.4rem;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
    display: none;
  }
  .nav[data-open='true'] { display: flex; }
  .nav a { padding: .8rem 0; border-bottom: 1px solid var(--line); }
  /* Телефон продублирован кнопкой внизу экрана, в шапке он лишний. */
  .header__phone { display: none; }
  .burger { display: block; margin-left: auto; }
  .layer { grid-template-columns: 4.6rem 1fr; }
  .layer__price { grid-column: 2; text-align: left; }
  .callbar {
    display: flex;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 70;
    background: var(--orange);
    color: #fff;
    text-decoration: none;
    font-family: var(--display);
    font-weight: 700;
    align-items: center;
    justify-content: center;
    padding: .9rem;
    box-shadow: 0 -8px 24px -16px rgba(0,0,0,.6);
  }
  body { padding-bottom: 56px; }
}

/* Появление слоёв разреза — сверху вниз, как при копке. */
@media (prefers-reduced-motion: no-preference) {
  .layer { animation: dig .5s cubic-bezier(.22,.61,.36,1) backwards; }
  .layer:nth-child(1) { animation-delay: .05s; }
  .layer:nth-child(2) { animation-delay: .12s; }
  .layer:nth-child(3) { animation-delay: .19s; }
  .layer:nth-child(4) { animation-delay: .26s; }
  .layer:nth-child(5) { animation-delay: .33s; }
  .layer:nth-child(6) { animation-delay: .40s; }
  @keyframes dig {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: none; }
  }
}

/* --- Подборщик станции в герое --- */
.picker {
  background: var(--navy);
  color: #fff;
  border-radius: var(--radius);
  padding: clamp(1.3rem, 2.4vw, 1.8rem);
  box-shadow: var(--shadow);
}
.picker h2 {
  font-size: 1.25rem;
  letter-spacing: -.01em;
}
.picker__hint {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #ff8a4c;
  margin-bottom: .5rem;
}
.picker label {
  display: block;
  font-size: .82rem;
  color: #b9c6d8;
  margin: 1rem 0 .35rem;
}
.picker select {
  width: 100%;
  font-family: var(--body);
  font-size: 1rem;
  padding: .7rem .85rem;
  border-radius: 9px;
  border: 1.5px solid rgba(255,255,255,.22);
  background: var(--navy-2);
  color: #fff;
}
.picker select:focus { border-color: var(--orange); outline: none; }
.picker__out { margin-top: 1.1rem; display: grid; gap: .45rem; }
.picker__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: .8rem;
  padding: .55rem 0;
  border-bottom: 1px dashed rgba(255,255,255,.2);
  font-size: .92rem;
}
.picker__row b { font-family: var(--mono); font-weight: 700; white-space: nowrap; }
.picker__row span { color: #dbe4f0; }
.picker__note {
  margin-top: .9rem;
  font-size: .78rem;
  color: #8ea3bd;
  line-height: 1.45;
}
.picker .btn { width: 100%; margin-top: 1rem; }