/* =========================================================
   Стили сайта. Типографика и палитра — по референсу e-legion.
   Шрифт-референс Dopis заменён на Onest (кириллица, Google Fonts).
   ========================================================= */

:root {
  /* палитра */
  --white:      #FFFFFF;
  --ink:        #141414;
  --navy:       #1E2738;
  --grey:       #949191;
  --grey-bg:    #F0F0F0;
  --grey-line:  #D9D9D9;
  --blue:       #1960FF;
  --blue-dark:  #2864D9;
  --blue-light: #84AEFF;
  --green:      #24DA8D;

  /* заглушки */
  --fill:       #A8691F;
  --fill-bg:    #FBF1E2;

  /* типографика */
  --font: "Onest", Arial, Helvetica, sans-serif;

  --fs-h1:   clamp(38px, 1.6rem + 3.6vw, 80px);
  --fs-h2:   clamp(32px, 1.4rem + 3.2vw, 74px);
  --fs-h3:   clamp(26px, 1.2rem + 1.8vw, 46px);
  --fs-card: clamp(24px, 1.1rem + 1.2vw, 40px);
  --fs-lead: clamp(18px, 1rem + 0.4vw, 24px);
  --fs-text: clamp(16px, 0.95rem + 0.2vw, 18px);

  /* сетка */
  --container: 1440px;
  --narrow: 1087px;
  --pad: clamp(16px, 4vw, 60px);
  --section: clamp(56px, 7vw, 100px);
  --radius-card: 18px;
  --radius-img: 30px;
  --radius-pill: 100px;
}

/* ---------- база ---------- */

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font: 400 16px/1.3 var(--font);
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a { color: var(--ink); text-decoration: none; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

h1, .h1 { font: 400 var(--fs-h1)/1.1 var(--font); color: var(--navy); margin: 0 0 27px; letter-spacing: -0.02em; text-wrap: balance; }
h2, .h2 { font: 400 var(--fs-h2)/1.1 var(--font); color: var(--navy); margin: 0 0 8px;  letter-spacing: -0.02em; text-wrap: balance; }
h3, .h3 { font: 400 var(--fs-h3)/1.25 var(--font); color: var(--navy); margin: 0 0 8px; letter-spacing: -0.015em; text-wrap: balance; }
h4, .h4 { font: 700 24px/1.15 var(--font); color: var(--ink); margin: 0 0 8px; }

p { margin: 0 0 16px; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding-inline: var(--pad); }
.container--narrow { max-width: calc(var(--narrow) + var(--pad) * 2); }

.section { padding-block: var(--section); }
.section--grey { background: var(--grey-bg); }
.section--navy { background: var(--navy); color: var(--white); }
.section--navy h2, .section--navy h3 { color: var(--white); }

.lead { font-size: var(--fs-lead); line-height: 1.3; color: var(--ink); max-width: 46ch; margin: 0 0 24px; }
.section--navy .lead { color: rgba(255,255,255,.8); }

.muted { color: var(--grey); }

/* заглушка под факт */
.fill {
  color: var(--fill);
  background: var(--fill-bg);
  border-bottom: 1px dashed var(--fill);
  padding: 0 .3em;
  font-size: .92em;
  white-space: nowrap;
}

/* ---------- кнопки ---------- */

.button {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  padding: 20px 60px;
  font: 400 16px/1 var(--font);
  text-align: center;
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}
.button--default { background: var(--navy); border-color: var(--navy); color: var(--white); }
.button--default:hover { background: var(--blue); border-color: var(--blue); }
.button--white { background: var(--white); border-color: var(--white); color: var(--ink); }
.button--white:hover { background: var(--blue); border-color: var(--blue); color: var(--white); }
.button--blue { background: var(--blue); border-color: var(--blue); color: var(--white); }
.button--blue:hover { background: var(--navy); border-color: var(--navy); }
.button--border { border-color: var(--grey); color: var(--grey); }
.button--border:hover { border-color: var(--ink); color: var(--ink); }
.button--small { padding: 12px 26px; }
.button--wide { width: 100%; }

@media (max-width: 700px) { .button { padding: 17px 34px; width: 100%; } }

/* ссылка со стрелкой */
.arrow-link { color: var(--blue); font-size: 18px; line-height: 30px; display: inline-flex; align-items: center; gap: 8px; }
.arrow-link::after { content: "→"; transition: transform .2s ease; }
.arrow-link:hover::after { transform: translateX(4px); }

/* ---------- шапка ---------- */

.header {
  position: sticky; top: 0; z-index: 50;
  background: var(--white);
  border-bottom: 1px solid var(--grey-line);
}
.header__inner { display: flex; align-items: center; gap: 24px; min-height: 72px; }
.header__logo { font-size: 20px; font-weight: 700; color: var(--navy); letter-spacing: -0.02em; margin-right: auto; }
.header__logo span { color: var(--blue); }
.header__nav { display: flex; align-items: center; gap: 28px; }
.header__nav a { font-size: 16px; color: var(--ink); }
.header__nav a:hover { color: var(--blue); }
.header__burger { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.header__burger span { display: block; width: 22px; height: 2px; background: var(--navy); margin: 4px 0; }

@media (max-width: 980px) {
  .header__nav {
    position: fixed; inset: 72px 0 auto 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--white); border-bottom: 1px solid var(--grey-line);
    padding: 8px var(--pad) 24px;
  }
  .header__nav[hidden] { display: none; }
  .header__nav a { padding: 14px 0; width: 100%; border-bottom: 1px solid var(--grey-line); }
  .header__nav .button { margin-top: 16px; }
  .header__burger { display: block; }
}

/* ---------- первый экран ---------- */

.hero { padding-block: clamp(40px, 6vw, 90px) clamp(32px, 4vw, 56px); }
.hero h1 { max-width: 16ch; }
.hero__lead { font-size: var(--fs-lead); line-height: 1.35; max-width: 60ch; color: var(--ink); margin: 0 0 32px; }
.hero__meta { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 26px; color: var(--grey); font-size: 16px; }

/* ---------- теги-фильтры ---------- */

.tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 40px; padding: 0; list-style: none; }
.tags__item {
  border: 0; border-radius: 60px; background: var(--grey-bg); color: var(--grey);
  padding: 10px 20px; font: 400 16px/1.1 var(--font); cursor: pointer;
  transition: background-color .2s ease, color .2s ease;
}
.tags__item:hover { color: var(--ink); }
.tags__item.is-active { background: var(--navy); color: var(--white); }

/* ---------- карточки компетенций ---------- */

.cards { display: flex; flex-direction: column; gap: 20px; }

.card {
  position: relative;
  display: flex; align-items: center; justify-content: space-between; gap: 40px;
  background: var(--grey-bg); border-radius: var(--radius-card);
  padding: 40px; min-height: 284px; overflow: hidden;
}
.card__info { display: flex; flex-direction: column; gap: 16px; max-width: 640px; }
.card__head { font-size: var(--fs-card); line-height: 1.1; font-weight: 400; color: var(--ink); margin: 0; letter-spacing: -0.015em; }
.card__text { font-size: var(--fs-text); line-height: 1.35; margin: 0; color: var(--ink); }
.card__tags { display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 4px 0 0; list-style: none; }
.card__tags li { background: var(--white); color: var(--grey); border-radius: 60px; padding: 9px 16px; font-size: 15px; line-height: 1.1; }
.card__media { flex-shrink: 0; width: 38%; max-width: 360px; }

/* заглушка изображения */
.ph-image {
  border-radius: var(--radius-img);
  background: var(--white);
  border: 1px dashed var(--grey);
  aspect-ratio: 4 / 3;
  display: flex; align-items: center; justify-content: center;
  color: var(--grey); font-size: 14px; text-align: center; padding: 16px;
}

@media (max-width: 900px) {
  .card { flex-direction: column; align-items: stretch; padding: 28px; min-height: 0; }
  .card__media { width: 100%; max-width: none; }
}

/* ---------- карточки решений ---------- */

.solutions { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; }

.solution {
  display: flex; flex-direction: column; gap: 16px;
  background: var(--grey-bg); border-radius: var(--radius-card); padding: 32px;
}
.section--grey .solution { background: var(--white); }
.solution__term { color: var(--grey); font-size: 15px; letter-spacing: .02em; }
.solution__head { font-size: clamp(22px, 1rem + 1vw, 28px); line-height: 1.15; font-weight: 400; color: var(--navy); margin: 0; letter-spacing: -0.015em; }
.solution__list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; font-size: 16px; line-height: 1.35; }
.solution__list li { position: relative; padding-left: 18px; }
.solution__list li::before { content: ""; position: absolute; left: 0; top: .6em; width: 8px; height: 1px; background: var(--blue); }
.solution__skills { font-size: 15px; line-height: 1.4; color: var(--ink); border-left: 2px solid var(--blue); padding-left: 14px; margin: 0; }
.solution__skills b { display: block; font-weight: 400; color: var(--grey); font-size: 13px; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 4px; }
.solution__foot {
  margin-top: auto; padding-top: 18px; border-top: 1px solid var(--grey-line);
  display: flex; align-items: baseline; justify-content: space-between; gap: 16px;
  font-size: 16px;
}

/* ---------- аккордеон ---------- */

.accordion { border-top: 1px solid var(--grey-line); }
.accordion__item { border-bottom: 1px solid var(--grey-line); }
.accordion__head {
  width: 100%; background: none; border: 0; cursor: pointer;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 26px 0; text-align: left;
  font: 400 clamp(20px, 1rem + 0.8vw, 26px)/1.2 var(--font); color: var(--navy);
}
.accordion__head::after { content: "+"; font-size: 28px; color: var(--blue); line-height: 1; }
.accordion__head[aria-expanded="true"]::after { content: "–"; }
.accordion__body { padding: 0 0 28px; }
.accordion__body[hidden] { display: none; }
.accordion__body ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; max-width: 70ch; }
.accordion__body li { position: relative; padding-left: 18px; font-size: var(--fs-text); line-height: 1.35; }
.accordion__body li::before { content: ""; position: absolute; left: 0; top: .65em; width: 8px; height: 1px; background: var(--blue); }

/* ---------- кейс ---------- */

.case { background: var(--grey-bg); border-radius: var(--radius-card); padding: clamp(24px, 4vw, 48px); }
.section--grey .case { background: var(--white); }
.case__label { color: var(--blue); font-size: 15px; letter-spacing: .08em; text-transform: uppercase; margin: 0 0 12px; }
.case__facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1px; background: var(--grey-line); border: 1px solid var(--grey-line); border-radius: 12px; overflow: hidden; margin: 28px 0; }
.case__facts > div { background: var(--white); padding: 16px 18px; }
.case__facts dt { color: var(--grey); font-size: 13px; letter-spacing: .06em; text-transform: uppercase; margin-bottom: 6px; }
.case__facts dd { margin: 0; font-size: 17px; }
.case__skills { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.case__skills li { position: relative; padding-left: 18px; font-size: var(--fs-text); line-height: 1.4; }
.case__skills li::before { content: ""; position: absolute; left: 0; top: .7em; width: 8px; height: 1px; background: var(--blue); }
.case__skills b { font-weight: 700; }

/* плитки */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.tile { background: var(--grey-bg); border-radius: var(--radius-card); padding: 28px; }
.section--grey .tile { background: var(--white); }
.tile b { display: block; font-size: 20px; font-weight: 700; margin-bottom: 8px; color: var(--navy); }
.tile span { font-size: var(--fs-text); line-height: 1.35; color: var(--ink); }

.section--navy .tile { background: rgba(255,255,255,.06); }
.section--navy .tile b { color: var(--white); }
.section--navy .tile span { color: rgba(255,255,255,.78); }

/* ---------- FAQ ---------- */

.faq { display: grid; gap: 20px; }
.faq__item { background: var(--grey-bg); border-radius: var(--radius-card); padding: 28px; }
.section--grey .faq__item { background: var(--white); }
.faq__item b { display: block; font-size: 20px; margin-bottom: 8px; color: var(--navy); }
.faq__item span { font-size: var(--fs-text); line-height: 1.4; }

/* ---------- форма ---------- */

.form { display: grid; gap: 16px; max-width: 560px; position: relative; }
.form__row { display: grid; gap: 8px; }
.form label { font-size: 15px; color: rgba(255,255,255,.7); }
.form input, .form select, .form textarea {
  font: 400 16px/1.3 var(--font);
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.25);
  color: var(--white);
  border-radius: 12px;
  padding: 16px 18px;
  width: 100%;
}
.form textarea { min-height: 110px; resize: vertical; }
.form input::placeholder, .form textarea::placeholder { color: rgba(255,255,255,.45); }
.form select option { color: var(--ink); }
.form__consent { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: rgba(255,255,255,.7); }
.form__consent input { width: 18px; height: 18px; flex-shrink: 0; margin-top: 2px; }
.form__consent a { color: var(--blue-light); text-decoration: underline; }
.form__note { font-size: 14px; color: rgba(255,255,255,.6); margin: 0; }
.form__status { font-size: 15px; margin: 0; min-height: 1.3em; }
.form__status[data-state="ok"] { color: var(--green); }
.form__status[data-state="error"] { color: #FF9A8B; }
.form__hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.contacts { display: grid; gap: 14px; align-content: start; font-size: var(--fs-text); }
.contacts a { color: var(--white); }
.contacts a:hover { color: var(--blue-light); }

.two-col { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(32px, 5vw, 80px); align-items: start; }
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } }

/* ---------- подвал ---------- */

.footer { background: var(--navy); color: rgba(255,255,255,.75); padding-block: 56px 40px; }
.footer a { color: rgba(255,255,255,.75); }
.footer a:hover { color: var(--white); }
.footer__top { display: flex; flex-wrap: wrap; gap: 32px 60px; justify-content: space-between; padding-bottom: 32px; border-bottom: 1px solid rgba(255,255,255,.15); }
.footer__logo { font-size: 20px; font-weight: 700; color: var(--white); }
.footer__nav { display: flex; flex-wrap: wrap; gap: 12px 28px; }
.footer__bottom { display: flex; flex-wrap: wrap; gap: 12px 40px; justify-content: space-between; padding-top: 24px; font-size: 14px; }

/* ---------- хлебные крошки ---------- */

.crumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: 15px; color: var(--grey); padding-top: 28px; }
.crumbs a { color: var(--grey); }
.crumbs a:hover { color: var(--blue); }

/* ---------- утилиты ---------- */

.stack-24 > * + * { margin-top: 24px; }
.stack-40 > * + * { margin-top: 40px; }
.mt-40 { margin-top: 40px; }
.mt-60 { margin-top: clamp(32px, 4vw, 60px); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}