/* ============================================================
   CHARTAR ENERGY — главная страница (лендинг)
   ============================================================ */

:root {
  --c-bg: #ffffff;
  --c-bg-dark: #1c1710;
  --c-bg-dark-2: #2a2318;
  --c-tint: #f5f2e9;
  --c-primary: #7a8b62;        /* энергетический зелёный */
  --c-primary-dark: #5c6a46;
  --c-accent: #f2c230;         /* янтарный акцент — энергия */
  --c-text: #241e14;
  --c-text-light: #eef4f8;
  --c-muted: #6f6757;
  --c-border: #e3ddcd;
  --radius: 12px;
  --shadow: 0 6px 24px rgba(28, 23, 16, .08);
  --font: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: min(1160px, 100% - 2.5rem);
  margin-inline: auto;
}

/* ---------- Кнопки ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .7rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font: 600 .95rem/1.2 var(--font);
  text-decoration: none;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, transform .15s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--c-primary); color: #fff; }
.btn--primary:hover { background: var(--c-primary-dark); }
.btn--ghost { border-color: var(--c-border); color: var(--c-text); background: transparent; }
.btn--ghost:hover { border-color: var(--c-primary); color: var(--c-primary); }
.section--dark .btn--ghost { border-color: rgba(255,255,255,.35); color: var(--c-text-light); }
.section--dark .btn--ghost:hover { border-color: var(--c-accent); color: var(--c-accent); }
/* Финальный блок на светлом фоне — тёмно-серый текст и контур */
.section--final .btn--ghost { border-color: #6f6757; color: #6f6757; }
.section--final .btn--ghost:hover { border-color: var(--c-primary); color: var(--c-primary); }
.btn--lg { padding: .95rem 1.8rem; font-size: 1.05rem; }
.btn__icon { font-weight: 700; }

/* ---------- Хедер ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 1.5rem;
  min-height: 86px;
}
.logo__img { height: 51px; width: auto; }

/* Меню разделов — рядом с логотипом, прижато к левому краю */
.header .dropdown { margin-right: auto; }

.nav__list {
  display: flex;
  flex-direction: column;
  list-style: none;
}
.nav__link {
  display: block;
  text-decoration: none;
  color: var(--c-text);
  font-size: .95rem;
  font-weight: 500;
  padding: .6rem 1rem;
  border-left: 3px solid transparent;
  transition: color .2s, border-color .2s, background .2s;
  white-space: nowrap;
}
.nav__link:hover { color: var(--c-primary); border-color: var(--c-primary); background: rgba(122,139,98,.06); }
.nav__link--active { color: var(--c-primary); border-color: var(--c-primary); background: rgba(122,139,98,.06); }

/* ---------- Выпадающее меню разделов ---------- */
.dropdown { position: relative; }
.dropdown__btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font: 600 .95rem var(--font);
  color: var(--c-text);
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 10px;
  padding: .55rem 1.1rem;
  cursor: pointer;
  transition: border-color .2s, color .2s;
}
.dropdown__btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
.dropdown__caret {
  font-size: .8rem;
  color: var(--c-primary);
  transition: transform .25s;
}
.dropdown.is-open .dropdown__caret { transform: rotate(180deg); }
.dropdown__panel {
  position: absolute;
  top: calc(100% + .5rem);
  left: 0;
  min-width: 250px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: 0 14px 36px rgba(28, 23, 16, .16);
  padding: .45rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: transform .22s, opacity .22s, visibility .22s;
  z-index: 120;
}
.dropdown.is-open .dropdown__panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.header__right { display: flex; align-items: center; gap: .9rem; }
.lang-switch { display: flex; gap: .15rem; }
.lang-switch__btn {
  background: none;
  border: none;
  font: 600 .82rem var(--font);
  color: var(--c-muted);
  cursor: pointer;
  padding: .25rem .35rem;
  border-radius: 6px;
  text-decoration: none;
  transition: color .2s, background .2s;
}
.lang-switch__btn:hover { color: var(--c-primary); }
.lang-switch__btn.is-active { color: #fff; background: var(--c-primary); }

/* ---------- Секции ---------- */
.section { padding: 4.5rem 0; }
.section--dark { background: var(--c-bg-dark); color: var(--c-text-light); }
.section--tint { background: var(--c-tint); }
.section--future {
  background: linear-gradient(160deg, var(--c-bg-dark-2), var(--c-bg-dark));
  color: var(--c-text-light);
}
.section--final { background: var(--c-tint); }

.section__title {
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: .8rem;
  text-wrap: balance;
}
.section__lead {
  color: var(--c-muted);
  max-width: 640px;
  margin-bottom: 2rem;
  font-size: 1.05rem;
}
.section--dark .section__lead,
.section--future .section__lead { color: #cfc7b6; }
.section__lead--strong {
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 600;
  color: var(--c-text);
}
.section__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin-top: 2.2rem;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  color: #fff;
  padding: clamp(4rem, 10vw, 8rem) 0;
  overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0;
  background:
    linear-gradient(115deg, rgba(28,23,16,.92) 30%, rgba(28,23,16,.55) 70%),
    radial-gradient(circle at 78% 30%, rgba(122,139,98,.45), transparent 55%),
    radial-gradient(circle at 90% 80%, rgba(242,194,48,.28), transparent 50%),
    url("../img/hero-energy.svg") center / cover no-repeat,
    var(--c-bg-dark);
}
.hero__inner { position: relative; }
.hero__title {
  font-size: clamp(1.7rem, 4.6vw, 3.1rem);
  font-weight: 800;
  line-height: 1.18;
  max-width: 760px;
  margin-bottom: 1.2rem;
  text-wrap: balance;
}
.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  max-width: 620px;
  color: #e9e3d4;
  margin-bottom: 2.2rem;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; }
/* «Обсудить задачу с инженером» — белый текст на тёмном фоне hero */
.hero .btn--ghost { border-color: rgba(255,255,255,.5); color: #fff; }
.hero .btn--ghost:hover { border-color: var(--c-accent); color: var(--c-accent); }

/* ---------- Сетки и карточки ---------- */
.grid { display: grid; gap: 1.1rem; }
.grid--tasks { grid-template-columns: repeat(4, 1fr); }
.grid--solutions,
.grid--research { grid-template-columns: repeat(3, 1fr); }
.grid--tech,
.grid--future { grid-template-columns: repeat(5, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.3rem 1.2rem;
  box-shadow: var(--shadow);
  transition: transform .2s, border-color .2s, box-shadow .2s;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--c-primary);
  box-shadow: 0 10px 30px rgba(28,23,16,.14);
}
.card--task {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}
.card--task h3 { font-size: 1.02rem; margin-bottom: .45rem; }
.card--task p { font-size: .88rem; color: var(--c-muted); }
.card--solution h3 { font-size: 1.08rem; margin-bottom: .45rem; color: var(--c-primary-dark); }
.card--solution p { font-size: .9rem; color: var(--c-muted); }

.card--post time { font-size: .8rem; color: var(--c-muted); }
.card__tag {
  display: inline-block;
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--c-primary);
  background: rgba(122,139,98,.09);
  border-radius: 999px;
  padding: .2rem .7rem;
  margin-bottom: .7rem;
}
.card--post h3 { font-size: 1.02rem; margin-bottom: .45rem; }
.card--post p { font-size: .9rem; color: var(--c-muted); margin-bottom: .7rem; }

/* ---------- Схема (как работает) ---------- */
.scheme__label {
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--c-accent);
  margin: 1.6rem 0 .9rem;
}
.scheme__flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem;
}
.scheme__node-group { display: flex; flex-wrap: wrap; gap: .5rem; }
.scheme__node {
  background: var(--c-bg-dark-2);
  border: 1px solid rgba(255,255,255,.18);
  color: var(--c-text-light);
  border-radius: 10px;
  padding: .55rem .95rem;
  font-size: .92rem;
  font-weight: 600;
}
.scheme__node--accent { border-color: var(--c-accent); }
.scheme__node--ems {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #241e14;
}
.scheme__arrow { color: var(--c-accent); font-size: 1.2rem; }
.scheme__flow--ems { align-items: center; }
.scheme__ems-note { color: #cfc7b6; font-size: .95rem; max-width: 560px; }
.scheme__hint {
  margin-top: 1.2rem;
  font-size: .9rem;
  color: #cfc7b6;
  border-left: 3px solid var(--c-accent);
  padding-left: 1rem;
}

/* ---------- Экономика ---------- */
.econ {
  max-width: 780px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}
.econ__chain { display: flex; flex-wrap: wrap; gap: .7rem; }
.econ__step {
  flex: 1 1 140px;
  text-align: center;
  border: 1px dashed var(--c-primary);
  border-radius: 10px;
  padding: .7rem .5rem;
  font-size: .9rem;
  font-weight: 600;
  color: var(--c-primary-dark);
  background: rgba(122,139,98,.05);
}
.econ__arrow { text-align: center; font-size: 1.4rem; color: var(--c-primary); margin: .7rem 0; }
.econ__result { font-size: 1rem; color: var(--c-muted); }
.econ__result strong { color: var(--c-text); }
.econ__btn { margin-top: 1.6rem; }
.econ__note {
  margin-top: 1.3rem;
  font-size: .85rem;
  color: var(--c-muted);
  border-top: 1px solid var(--c-border);
  padding-top: 1rem;
}

/* ---------- Жизненный цикл ---------- */
.lifecycle {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  counter-reset: step;
}
.lifecycle__step {
  counter-increment: step;
  position: relative;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  padding: .55rem 1.1rem .55rem 2.5rem;
  font-size: .92rem;
  font-weight: 600;
  box-shadow: var(--shadow);
}
.lifecycle__step::before {
  content: counter(step);
  position: absolute;
  left: .6rem; top: 50%;
  transform: translateY(-50%);
  width: 1.5rem; height: 1.5rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  font-size: .78rem;
}

/* ---------- Чипы технологий / будущего ---------- */
.chip {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 10px;
  padding: .85rem .9rem;
  display: flex;
  flex-direction: column;
  gap: .15rem;
  transition: border-color .2s, background .2s;
}
.chip:hover { border-color: var(--c-accent); }
.chip strong { font-size: .95rem; color: var(--c-text-light); }
.chip span { font-size: .8rem; color: #cfc7b6; }

/* ---------- Партнёры ---------- */
.partners {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.partners__item {
  flex: 1 1 200px;
  text-align: center;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.6rem 1rem;
  font-weight: 700;
  color: var(--c-muted);
  letter-spacing: .03em;
}

/* ---------- Финальный блок и форма ---------- */
.final { display: grid; gap: 2.2rem; grid-template-columns: 1fr 1.1fr; align-items: start; }
.final__actions { display: flex; flex-direction: column; gap: 1rem; }

.form {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.8rem;
}
.form__title { font-size: 1.15rem; margin-bottom: 1.2rem; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form__field { display: flex; flex-direction: column; gap: .35rem; margin-bottom: 1rem; font-size: .88rem; font-weight: 600; color: var(--c-muted); }
.form__field input,
.form__field textarea {
  font: 400 .95rem var(--font);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: .65rem .8rem;
  transition: border-color .2s, box-shadow .2s;
}
.form__field input:focus,
.form__field textarea:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(122,139,98,.14);
}
.form__field input.is-invalid,
.form__field textarea.is-invalid { border-color: #d33; }
.form__foot { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; }
.form__check { display: flex; gap: .5rem; align-items: flex-start; font-size: .8rem; font-weight: 400; color: var(--c-muted); max-width: 320px; cursor: pointer; }
.form__check input { margin-top: .2rem; accent-color: var(--c-primary); }
.form__status { margin-top: .8rem; font-size: .9rem; min-height: 1.2em; }
.form__status--ok { color: var(--c-primary-dark); }
.form__status--err { color: #d33; }

/* ---------- Подвал ---------- */
.footer { background: var(--c-bg-dark); color: #cdc6b6; padding: 3rem 0 0; font-size: .92rem; }
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 2.5rem;
}
.footer__logo { width: 150px; height: 150px; margin-bottom: 1rem; }
.footer__brand p { max-width: 300px; }
.footer__nav { display: flex; flex-direction: column; gap: .5rem; }
.footer__nav a, .footer__docs a, .footer__contacts a { color: #cdc6b6; text-decoration: none; }
.footer__nav a:hover, .footer__docs a:hover, .footer__contacts a:hover { color: #fff; }
.footer__contacts p { margin-bottom: .4rem; }
.footer__social { display: flex; gap: .6rem; margin-top: .8rem; }
.footer__social a {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 50%;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}
.footer__social a:hover { border-color: var(--c-accent); color: var(--c-accent); }
.footer__docs { display: flex; flex-direction: column; gap: .5rem; }
.lang-switch--footer { margin-top: 1rem; }
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  padding: 1.1rem 0;
  font-size: .82rem;
  color: #a89f8b;
}

/* ============================================================
   АДАПТИВНОСТЬ
   ============================================================ */
@media (max-width: 1080px) {
  .grid--tasks { grid-template-columns: repeat(3, 1fr); }
  .grid--tech, .grid--future { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 960px) {
  .grid--solutions, .grid--research { grid-template-columns: repeat(2, 1fr); }
  .grid--tech, .grid--future { grid-template-columns: repeat(3, 1fr); }
  .final { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 680px) {
  .section { padding: 3rem 0; }
  .grid--tasks { grid-template-columns: repeat(2, 1fr); }
  .grid--tech, .grid--future { grid-template-columns: repeat(2, 1fr); }
  .hero__actions .btn { width: 100%; }
  .form__row { grid-template-columns: 1fr; gap: 0; }
  .econ { padding: 1.4rem; }
  /* На узких экранах панель меню разворачиваем на всю ширину хедера */
  .dropdown__panel { position: fixed; left: 1rem; right: 1rem; min-width: 0; }
}

@media (max-width: 460px) {
  .grid--tasks, .grid--solutions, .grid--research,
  .grid--tech, .grid--future { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .final__actions .btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}