/* ------------------------------------------------------------------
   ООО «Нефтебаза Черепаново» — единственный файл стилей
   Вёрстка mobile-first: базовые правила — для телефона,
   @media (min-width: …) — расширения для планшета и десктопа.
   Палитра снята с логотипа и с полос на резервуарах (зелёная + синяя).
------------------------------------------------------------------ */

@font-face {
  font-family: 'Golos Text';
  font-style: normal;
  font-display: swap;
  font-weight: 400 900;
  src: url('fonts/golos-cyrillic.woff2') format('woff2-variations');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'Golos Text';
  font-style: normal;
  font-display: swap;
  font-weight: 400 900;
  src: url('fonts/golos-latin.woff2') format('woff2-variations');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+2000-206F, U+20AC, U+2122, U+2212;
}

:root {
  --ink: #14202b;
  --ink-soft: #55697c;
  --blue: #2a67a6;
  --blue-deep: #1a3d60;
  --green: #53ba57;
  --green-light: #8ada8e;
  --snow: #f3f6f9;
  --line: #dbe2ea;
  --white: #fff;

  --step--1: 0.9rem;
  --step-0: 1.0625rem;
  --step-1: 1.2rem;
  --step-2: clamp(1.35rem, 1.15rem + 0.9vw, 1.7rem);
  --step-3: clamp(1.7rem, 1.3rem + 1.8vw, 2.3rem);
  --step-4: clamp(2.2rem, 1.5rem + 3.6vw, 3.8rem);

  --gutter: 1.25rem;
  --measure: 62ch;
  --radius: 6px;
  --head-h: 64px;
  --tap: 48px;

  /* полоса резервуара: зелёная сверху, синяя снизу, между ними просвет */
  --stripe: linear-gradient(to bottom,
      var(--green) 0 40%, transparent 40% 60%, var(--blue) 60% 100%);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Golos Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  font-size: var(--step-0);
  line-height: 1.55;
  color: var(--ink);
  background: var(--white);
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--blue); }

h1, h2, h3 {
  margin: 0;
  line-height: 1.12;
  font-weight: 600;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
p { text-wrap: pretty; }

:where(a, button):focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 3px;
  border-radius: 3px;
}

.skip { position: absolute; left: -9999px; }
.skip:focus {
  left: 1rem; top: 1rem; z-index: 60;
  background: var(--white); padding: 0.6rem 1rem; border-radius: 4px;
}

.wrap {
  width: min(100% - 2 * var(--gutter), 1180px);
  margin-inline: auto;
}

/* якорные секции не прячутся под липкой шапкой */
[id] { scroll-margin-top: calc(var(--head-h) + 12px); }

/* ------------------------------ шапка ------------------------------ */

.masthead {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.94);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}

.masthead__inner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: var(--head-h);
}

.masthead__logo { flex: none; margin-right: auto; display: block; }
.masthead__logo img { width: 96px; height: auto; }

/* иконка-кнопка телефона (текст только для читалок и десктопа) */
.masthead__phone {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-width: var(--tap);
  min-height: var(--tap);
  border-radius: 999px;
  color: var(--blue-deep);
  text-decoration: none;
  font-weight: 600;
  white-space: nowrap;
}
.masthead__phone svg { width: 22px; height: 22px; flex: none; }
.masthead__phone span { display: none; }
.masthead__phone:hover { color: var(--blue); }

/* кнопка меню */
.burger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--tap);
  height: var(--tap);
  margin-right: -0.5rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  border-radius: 999px;
}
.burger span {
  position: relative;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: background-color 0.15s ease;
}
.burger span::before, .burger span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.2s ease;
}
.burger span::before { transform: translateY(-7px); }
.burger span::after { transform: translateY(7px); }
.masthead.is-open .burger span { background: transparent; }
.masthead.is-open .burger span::before { transform: rotate(45deg); }
.masthead.is-open .burger span::after { transform: rotate(-45deg); }

/* меню: на телефоне — выпадающая панель под шапкой */
.nav {
  display: none;
  position: absolute;
  left: 0; right: 0;
  top: 100%;
  flex-direction: column;
  padding: 0.5rem var(--gutter) 1rem;
  background: var(--white);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 16px 32px -20px rgba(20, 32, 43, 0.35);
}
.masthead.is-open .nav { display: flex; }

.nav a {
  display: flex;
  align-items: center;
  min-height: var(--tap);
  padding: 0.25rem 0.25rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
  font-size: var(--step-1);
  border-bottom: 1px solid var(--line);
}
.nav a:last-child { border-bottom: 0; }

/* без JavaScript кнопки нет, меню показано лентой */
html:not(.js) .burger { display: none; }
html:not(.js) .nav {
  display: flex;
  position: static;
  flex-direction: row;
  gap: 1rem;
  padding: 0;
  border: 0;
  box-shadow: none;
  overflow-x: auto;
  order: 5;
  width: 100%;
}
html:not(.js) .nav a { border: 0; white-space: nowrap; font-size: var(--step--1); }
html:not(.js) .masthead__inner { flex-wrap: wrap; padding-bottom: 0.4rem; }

/* ------------------------------ герой ------------------------------ */

.hero { padding: 0; }

.hero__media {
  position: relative;
  margin: 0;
  aspect-ratio: 4 / 3;
  max-height: min(62vh, 560px);
  overflow: hidden;
}
.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 55% 60%;
}
/* единственный яркий элемент сайта: полоса резервуара по нижней кромке фото */
.hero__media::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 14px;
  background: var(--stripe);
}

.hero__body { padding-block: 1.75rem 2.5rem; }

.hero__place {
  margin: 0 0 0.7rem;
  color: var(--blue);
  font-weight: 500;
  font-size: var(--step--1);
}

.hero h1 {
  font-size: var(--step-4);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.02;
}

.hero__lead {
  font-size: var(--step-0);
  color: var(--ink-soft);
  max-width: 48ch;
  margin: 1.1rem 0 0;
}

.hero__actions {
  display: grid;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

/* кнопки */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 52px;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: var(--step-0);
  border: 1.5px solid transparent;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn svg { width: 20px; height: 20px; flex: none; }
.btn--primary { background: var(--blue); color: var(--white); }
.btn--primary:hover { background: var(--blue-deep); }
.btn--ghost { border-color: var(--line); color: var(--ink); background: var(--white); }
.btn--ghost:hover { border-color: var(--blue); color: var(--blue); }

/* --------------------------- общие секции --------------------------- */

.band { padding-block: clamp(2.75rem, 7vw, 5rem); }
.band--snow { background: var(--snow); }

.band__head { margin-bottom: clamp(1.5rem, 4vw, 2.5rem); }
.band__head h2 { font-size: var(--step-3); }
.band__head p {
  margin: 0.8rem 0 0;
  color: var(--ink-soft);
  max-width: var(--measure);
}

/* ------------------------ направления работы ------------------------ */

.lines {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr 1fr;
  padding: 0;
  margin: 0;
  list-style: none;
}

.line {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1rem 1.2rem;
}
.line__icon { width: 40px; height: 40px; margin-bottom: 0.9rem; }
.line p { margin: 0; font-weight: 500; font-size: var(--step--1); line-height: 1.4; }

/* ------------------- мощности: единственный тёмный экран ------------------- */

.band--deep {
  background: var(--blue-deep);
  color: var(--white);
  background-image: radial-gradient(120% 80% at 100% 0%, rgba(42, 103, 166, 0.5), transparent 60%);
}
.band--deep .band__head h2 { color: var(--white); }
.band--deep .band__head p { color: rgba(255, 255, 255, 0.7); }

.specs {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr 1fr;
}

.spec {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  padding: 1rem 1rem 1.1rem;
}

.spec__value {
  margin: 0;
  font-size: var(--step-2);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  white-space: nowrap;
}
.spec__unit {
  display: block;
  margin-top: 0.15rem;
  font-size: var(--step--1);
  font-weight: 500;
  color: var(--green-light);
  letter-spacing: 0;
}
.spec__label {
  margin: 0.6rem 0 0;
  font-size: var(--step--1);
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.78);
}

.specs__note {
  margin: 1.25rem 0 0;
  font-size: var(--step--1);
  color: rgba(255, 255, 255, 0.55);
}

/* -------------------------- текст + фото -------------------------- */

.split { display: grid; gap: 1.75rem; align-items: start; }

.prose p { margin: 0 0 1rem; max-width: var(--measure); }
.prose p:last-child { margin-bottom: 0; }

.split__figure { margin: 0; }
.split__figure img {
  width: 100%;
  border-radius: var(--radius);
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

.subhead { font-size: var(--step-2); margin-bottom: 1.1rem; }
.prose .subhead { font-size: var(--step-3); }

/* --------------------------- продукция --------------------------- */

.offers { display: grid; gap: 0.75rem; }

.offer {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 1.25rem 1.6rem;
  background: var(--white);
  overflow: hidden;
}
.offer::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 8px;
  background: linear-gradient(to right,
      var(--green) 0 40%, transparent 40% 60%, var(--blue) 60% 100%);
}

.offer h3 { font-size: var(--step-1); }
.offer__grade { color: var(--ink-soft); font-size: var(--step--1); margin: 0.5rem 0 0; }
.offer__price {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.75rem;
  margin: 1rem 0 0;
  font-weight: 600;
  color: var(--blue-deep);
}
.offer__price a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 0.9rem;
  border-radius: 999px;
  background: var(--snow);
  color: var(--blue-deep);
  text-decoration: none;
}
.offer__price a:hover { background: var(--line); }

.grades { border-top: 1px solid var(--line); }
.subhead--spaced { margin-top: 2.5rem; margin-bottom: 0.75rem; }
.grade {
  display: grid;
  gap: 0.2rem;
  padding-block: 0.95rem;
  border-bottom: 1px solid var(--line);
}
.grade p { margin: 0; }
.grade__name { font-weight: 600; }
.grade__spec { color: var(--ink-soft); font-size: var(--step--1); }

/* -------------------------- преимущества -------------------------- */

.pluses {
  display: grid;
  gap: 0.6rem 1.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.pluses li {
  position: relative;
  padding-left: 1.9rem;
  font-weight: 500;
}
.pluses li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 50%;
  background: var(--green)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3.5 8.5l3 3 6-6' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    center / 12px no-repeat;
}

/* --------------------------- контакты --------------------------- */

.contacts { display: grid; gap: 0.75rem; }

.contact {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem 1.25rem;
  background: var(--white);
}
.contact__label {
  margin: 0 0 0.5rem;
  font-size: var(--step--1);
  color: var(--ink-soft);
}
.contact__value { margin: 0; font-size: var(--step-1); font-weight: 600; line-height: 1.35; }
.contact__value + .contact__value { margin-top: 0.35rem; }
.contact__value a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  color: var(--blue-deep);
  text-decoration: none;
}
.contact__value a:hover { color: var(--blue); text-decoration: underline; }
.contact__value--plain { font-weight: 500; font-size: var(--step-0); max-width: 32ch; }
.contact__map {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.75rem;
  min-height: 40px;
  font-weight: 500;
  color: var(--blue);
}

/* ---------------------------- подвал ---------------------------- */

.foot {
  border-top: 1px solid var(--line);
  padding-block: 2rem;
  font-size: var(--step--1);
  color: var(--ink-soft);
}
.foot__inner { display: flex; flex-direction: column; gap: 1rem; }
.foot__legal { margin: 0; max-width: 44ch; }
.foot__links { display: flex; flex-wrap: wrap; gap: 0.25rem 1.5rem; }
.foot__links a { color: var(--ink-soft); display: inline-flex; align-items: center; min-height: 40px; }
.foot__links span { color: var(--ink); font-weight: 500; display: inline-flex; align-items: center; min-height: 40px; }

/* ------------- нижняя панель на телефоне: позвонить / написать ------------- */

.callbar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 30;
  display: flex;
  gap: 0.6rem;
  padding: 0.6rem var(--gutter);
  padding-bottom: calc(0.6rem + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, 0.94);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  backdrop-filter: saturate(160%) blur(10px);
  border-top: 1px solid var(--line);
}
.callbar .btn { flex: 1; min-height: var(--tap); font-size: var(--step--1); white-space: nowrap; }
.callbar .btn--ghost { flex: 0 0 var(--tap); padding: 0; }
.callbar .btn--ghost svg { width: 22px; height: 22px; }
body.has-callbar { padding-bottom: calc(var(--tap) + 1.5rem + env(safe-area-inset-bottom)); }

/* ------------------------- внутренние страницы ------------------------- */

.band--first { padding-top: clamp(2rem, 5vw, 3.75rem); }
.band--first h1 { font-size: var(--step-3); }

.reqs { margin: 0; border-top: 1px solid var(--line); }
.req {
  display: grid;
  gap: 0.2rem;
  padding-block: 0.9rem;
  border-bottom: 1px solid var(--line);
}
.req__label { color: var(--ink-soft); font-size: var(--step--1); }
.req__value { margin: 0; font-weight: 500; overflow-wrap: anywhere; }
.req__value a { color: var(--blue-deep); }

.reqs--inline { margin: 1.5rem 0 1.75rem; }

.legal { max-width: 72ch; }
.legal p { margin: 0 0 1rem; }
.legal__head {
  font-size: var(--step-1);
  margin: 2.25rem 0 1rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}
.legal__head:first-child { margin-top: 0; padding-top: 0; border-top: none; }

/* --------------------------- планшет --------------------------- */

@media (min-width: 640px) {
  :root { --gutter: 1.5rem; }
  .hero__actions { display: flex; flex-wrap: wrap; }
  .hero__actions .btn { white-space: nowrap; }
  .lines { grid-template-columns: repeat(4, 1fr); }
  .specs { grid-template-columns: repeat(3, 1fr); }
  .offers { grid-template-columns: 1fr 1fr; }
  .grade { grid-template-columns: minmax(0, 20rem) 1fr; gap: 0.3rem 2rem; }
  .pluses { grid-template-columns: 1fr 1fr; }
  .contacts { grid-template-columns: 1fr 1fr; }
  .foot__inner { flex-direction: row; justify-content: space-between; align-items: center; }
  .req { grid-template-columns: minmax(0, 22rem) 1fr; gap: 0.3rem 2.5rem; }
  .reqs--inline .req { grid-template-columns: minmax(0, 16rem) 1fr; padding-block: 0.8rem; }
}

/* --------------------------- десктоп --------------------------- */

@media (min-width: 900px) {
  :root { --head-h: 76px; }

  .masthead__logo img { width: 124px; }
  .masthead__logo { margin-right: 0; }
  .burger { display: none; }

  .nav {
    display: flex;
    position: static;
    flex-direction: row;
    gap: 0.25rem;
    margin-left: auto;
    padding: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
  }
  .nav a {
    border: 0;
    padding: 0.4rem 0.85rem;
    font-size: var(--step--1);
    border-radius: 999px;
    min-height: 40px;
  }
  .nav a:hover { background: var(--snow); }

  .masthead__phone { padding: 0 0.25rem 0 0.75rem; margin-left: 0.75rem; }
  .masthead__phone span { display: inline; }
  .masthead__phone svg { width: 18px; height: 18px; }

  .hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: stretch;
    min-height: min(78vh, 720px);
  }
  .hero__media {
    order: 2;
    aspect-ratio: auto;
    max-height: none;
    height: 100%;
  }
  .hero__body {
    order: 1;
    align-self: center;
    width: min(100% - 2 * var(--gutter), 590px);
    margin-left: max(var(--gutter), calc((100vw - 1180px) / 2));
    padding-block: 3.5rem;
    padding-right: 3rem;
  }
  .hero__lead { font-size: var(--step-1); }
  .hero__actions { margin-top: 2rem; }

  .split { grid-template-columns: 1.15fr 0.85fr; gap: 4rem; }
  .split__figure img { aspect-ratio: 4 / 5; }
  .products__top { grid-template-columns: 1fr 1fr; align-items: stretch; }
  .products__top .offers { grid-template-columns: 1fr; align-content: start; }
  .products__top .split__figure img { aspect-ratio: auto; height: 100%; }

  .lines { gap: 1rem; }
  .line { padding: 1.5rem 1.4rem; }
  .line p { font-size: var(--step-0); }

  .specs { gap: 1rem; }
  .spec { padding: 1.4rem 1.5rem 1.5rem; }
  .spec__value { font-size: var(--step-3); }
  .spec__label { font-size: var(--step-0); }

  .pluses { grid-template-columns: repeat(4, 1fr); gap: 1rem 2rem; }
  .contacts { grid-template-columns: repeat(3, 1fr); gap: 1rem; }

  .callbar { display: none; }
  body.has-callbar { padding-bottom: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

@media print {
  .masthead, .callbar, .hero__media, .split__figure { display: none; }
  body.has-callbar { padding-bottom: 0; }
}