/* ==========================================================================
   [Бренд] — styles.css
   Концепция: «патч-корд». Жёлтый кабель выходит из логотипа и тянется
   через страницу, подключаясь к порту каждой секции.
   Палитра: желток / лимонная бумага / крем / янтарь / умбра.
   ========================================================================== */

:root {
  --yolk: #FFC400;      /* основной жёлтый */
  --lemon: #FFE98A;     /* светлый жёлтый */
  --paper: #FFF6CF;     /* фон страницы */
  --cream: #FFFCEB;     /* карточки, поля */
  --amber: #C98A00;     /* тёмный янтарь: акценты, LED */
  --umber: #2A2103;     /* текст и контуры */
  --umber-soft: #5A4A12;

  --font-display: "Unbounded", "Arial Black", "Segoe UI", sans-serif;
  --font-body: "Onest", "Segoe UI", Roboto, Arial, sans-serif;

  --pad: 20px;          /* поля страницы */
  --wrap: 1180px;
  --rail: 28px;         /* ось кабеля от левого края .wrap */
  --gutter: 96px;       /* отступ контента от левого края .wrap */
  --stroke: 3px;
  --radius: 16px;
  --hard: 5px 5px 0 var(--umber);   /* «жёсткая» тень */
  --ease: cubic-bezier(.2, .8, .2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--umber);
  font: 400 1.0625rem/1.65 var(--font-body);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-underline-offset: .18em; text-decoration-thickness: 2px; }
p { margin: 0 0 1.1em; max-width: 68ch; }
h1, h2, h3 { font-family: var(--font-display); margin: 0; overflow-wrap: break-word; }

:focus-visible {
  outline: 3px solid var(--umber);
  outline-offset: 3px;
  border-radius: 6px;
}
.section--ink :focus-visible, .site-footer :focus-visible { outline-color: var(--yolk); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}

.skip-link {
  position: absolute; left: 12px; top: -80px; z-index: 100;
  background: var(--umber); color: var(--yolk);
  padding: 12px 18px; border-radius: 10px; font-weight: 700;
}
.skip-link:focus { top: 12px; }

/* ---------- Сетка ---------- */
.wrap {
  position: relative;
  z-index: 2;
  width: min(100% - var(--pad) * 2, var(--wrap));
  margin-inline: auto;
  padding-left: var(--gutter);
}
.wrap--flush { padding-left: 0; }

/* ---------- Кнопки ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .6em;
  padding: .8em 1.35em;
  font: 700 .95rem/1.1 var(--font-body);
  text-decoration: none;
  border: var(--stroke) solid var(--umber);
  border-radius: 999px;
  cursor: pointer;
  box-shadow: var(--hard);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), background-color .18s;
}
.btn:hover { transform: translate(2px, 2px); box-shadow: 3px 3px 0 var(--umber); }
.btn:active { transform: translate(5px, 5px); box-shadow: 0 0 0 var(--umber); }
.btn--ink { background: var(--umber); color: var(--yolk); box-shadow: 5px 5px 0 var(--amber); }
.btn--ink:hover { box-shadow: 3px 3px 0 var(--amber); }
.btn--ink:active { box-shadow: 0 0 0 var(--amber); }
.btn--ghost { background: var(--cream); color: var(--umber); }
.btn--lg { font-size: 1.05rem; padding: 1em 1.6em; }

/* ---------- Шапка ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--yolk);
  border-bottom: var(--stroke) solid var(--umber);
  transition: background-color .25s;
}
.site-header.is-stuck { background: var(--cream); }
.header__row {
  display: flex; align-items: center; gap: 24px;
  min-height: 72px;
}
.logo {
  display: inline-flex; align-items: center; gap: 14px;
  text-decoration: none;
  /* центр значка совпадает с осью кабеля */
  margin-left: calc(var(--rail) - 20px);
}
.logo__mark { flex: none; }
.logo__text { font: 800 1.05rem/1 var(--font-display); letter-spacing: -.01em; }

.site-nav { margin-left: auto; }
.site-nav__list { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
.site-nav a {
  display: block; padding: 8px 12px;
  font-weight: 500; font-size: .95rem; text-decoration: none;
  border-radius: 999px;
  transition: background-color .2s, color .2s;
}
.site-nav a:hover { background: rgba(42, 33, 3, .1); }
.site-nav a.is-active { background: var(--umber); color: var(--yolk); }

.header__cta { box-shadow: none; padding: .7em 1.2em; }
.header__cta:hover, .header__cta:active { box-shadow: none; transform: none; background: #453708; }

.nav-toggle {
  display: none; align-items: center; gap: 10px;
  margin-left: auto; padding: 9px 14px;
  background: var(--cream); color: var(--umber);
  border: var(--stroke) solid var(--umber); border-radius: 999px;
  font: 700 .9rem/1 var(--font-body); cursor: pointer;
}
.nav-toggle__bars, .nav-toggle__bars::before {
  display: block; width: 18px; height: 3px; border-radius: 2px; background: var(--umber);
  transition: transform .25s var(--ease);
}
.nav-toggle__bars { position: relative; transform: translateY(-3px); }
.nav-toggle__bars::before { content: ""; position: absolute; top: 7px; left: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { transform: translateY(0) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(-7px) rotate(-90deg); }

/* ---------- Кабель ---------- */
main { position: relative; }
.cable {
  position: absolute; inset: 0; width: 100%; height: 100%;
  z-index: 1; pointer-events: none; overflow: visible;
}
.cable path { fill: none; stroke-linecap: round; stroke-linejoin: round; }
.cable__shadow { stroke: rgba(42, 33, 3, .14); stroke-width: 9; stroke-dasharray: 1 12; }
.cable__jacket { stroke: var(--umber); stroke-width: 10; }
.cable__core { stroke: var(--yolk); stroke-width: 4.5; }
.cable__packet { fill: var(--cream); stroke: var(--umber); stroke-width: 3.5; }

/* Порт секции — точка подключения кабеля */
.port {
  position: absolute; top: 6px;
  left: calc(var(--rail) - 15px);
  width: 30px; height: 30px;
  background: var(--cream);
  border: var(--stroke) solid var(--umber);
  border-radius: 9px;
  z-index: 3;
  transition: background-color .3s, transform .45s var(--ease);
}
.port::after {
  content: ""; position: absolute; inset: 7px;
  border-radius: 50%; background: var(--umber-soft); opacity: .35;
  transition: background-color .3s, opacity .3s, box-shadow .3s;
}
.port.is-live { background: var(--yolk); transform: scale(1.12) rotate(90deg); }
.port.is-live::after { background: var(--umber); opacity: 1; box-shadow: 0 0 0 4px rgba(255, 252, 235, .9); }
.section--ink .port { border-color: var(--yolk); background: var(--umber); }
.section--ink .port.is-live { background: var(--yolk); }

/* ---------- HERO ---------- */
.hero {
  background-color: var(--yolk);
  background-image: radial-gradient(rgba(42, 33, 3, .22) 1.4px, transparent 1.6px);
  background-size: 26px 26px;
  border-bottom: var(--stroke) solid var(--umber);
  padding: clamp(36px, 6vw, 80px) 0 clamp(48px, 7vw, 96px);
}
.hero__grid {
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: clamp(24px, 4vw, 64px); align-items: center;
}
.crumbs ol {
  display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0 0 28px; padding: 0;
  font-size: .875rem; font-weight: 500;
}
.crumbs li + li::before { content: "/"; margin-right: 6px; opacity: .55; }
.crumbs [aria-current] { opacity: .75; }

.hero__title {
  font-weight: 800;
  font-size: clamp(1.9rem, 4.3vw, 3.7rem);
  line-height: 1.06; letter-spacing: -.025em;
  margin-bottom: .55em;
  text-wrap: balance;
}
.hero__lead { font-size: clamp(1.05rem, 1.4vw, 1.22rem); line-height: 1.6; max-width: 56ch; margin-bottom: 2em; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 16px; }
.hero__figure { margin: 0; }
.hero__figure img { width: 100%; }

/* Единственная автоматическая анимация загрузки — в hero */
@media (prefers-reduced-motion: no-preference) {
  .crumbs, .hero__title, .hero__lead, .hero__actions { animation: rise .9s var(--ease) both; }
  .hero__title { animation-delay: .08s; }
  .hero__lead { animation-delay: .2s; }
  .hero__actions { animation-delay: .32s; }
  .hero__figure { animation: plug-in 1.1s var(--ease) .25s both; }
}
@keyframes rise { from { opacity: 0; transform: translateY(28px); } }
@keyframes plug-in { from { opacity: 0; transform: translateX(60px) rotate(3deg) scale(.94); } }

/* ---------- Секции ---------- */
.section { padding: clamp(64px, 9vw, 128px) 0; }
.section--paper { background: var(--paper); }
.section--lemon { background: var(--lemon); border-block: var(--stroke) solid var(--umber); }
.section--ink { background: var(--umber); color: var(--paper); }
.section--yolk { background: var(--yolk); border-top: var(--stroke) solid var(--umber); }

.section__title {
  font-weight: 700;
  font-size: clamp(1.5rem, 2.9vw, 2.5rem);
  line-height: 1.12; letter-spacing: -.02em;
  margin-bottom: .7em; max-width: 22ch;
  text-wrap: balance;
}
.section--ink .section__title { color: var(--yolk); }
.section__intro { font-size: 1.15rem; max-width: 60ch; margin-bottom: 2.4em; }

/* Появление контента, когда кабель дошёл до порта секции (класс .js ставит script.js) */
.js .section .reveal {
  opacity: 0; transform: translateY(22px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.js .section.is-live .reveal { opacity: 1; transform: none; }
.js .section.is-live .reveal:nth-child(2) { transition-delay: .08s; }
.js .section.is-live .reveal:nth-child(3) { transition-delay: .16s; }
.js .section.is-live .reveal:nth-child(4) { transition-delay: .24s; }
.js .section.is-live .reveal:nth-child(5) { transition-delay: .32s; }

/* ---------- Две колонки: текст + иллюстрация ---------- */
.split {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: clamp(28px, 5vw, 72px); align-items: center;
}
.split--reverse { grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); }
.split__figure { margin: 0; }
.split__figure img {
  width: 100%;
  background: var(--cream);
  border: var(--stroke) solid var(--umber);
  border-radius: 28px;
  box-shadow: 8px 8px 0 var(--umber);
}
.split__figure figcaption { margin-top: 18px; font-size: .9rem; color: var(--umber-soft); }

.tags { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; margin: 1.6em 0 0; padding: 0; }
.tags a {
  display: block; padding: 7px 14px;
  background: var(--cream); border: 2px solid var(--umber); border-radius: 999px;
  font-size: .9rem; font-weight: 500; text-decoration: none;
  transition: background-color .2s, transform .2s var(--ease);
}
.tags a:hover { background: var(--yolk); transform: translateY(-2px); }

/* ---------- Патч-панель возможностей ---------- */
.panel {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  background: var(--cream);
  border: var(--stroke) solid var(--umber);
  border-radius: 24px;
  box-shadow: 8px 8px 0 var(--umber);
  overflow: hidden;
}
.panel__slot { padding: 28px 24px 30px; transition: background-color .25s; }
.panel__slot + .panel__slot { border-left: 2px solid var(--umber); }
.panel__slot:hover { background: #FFF1B0; }
.panel__slot h3 { font-size: 1.02rem; line-height: 1.25; font-weight: 700; margin: 22px 0 12px; }
.panel__slot p { font-size: .98rem; margin: 0; }

/* Гнездо RJ-45 со светодиодом */
.jack {
  position: relative; display: block; width: 56px; height: 46px;
  background: var(--umber); border-radius: 10px;
}
.jack::before {
  content: ""; position: absolute; left: 12px; right: 12px; top: 12px; bottom: 0;
  background: var(--paper); border-radius: 4px 4px 0 0;
  clip-path: polygon(0 0, 100% 0, 100% 62%, 76% 62%, 76% 100%, 24% 100%, 24% 62%, 0 62%);
}
.jack i {
  position: absolute; right: -8px; top: -8px; width: 16px; height: 16px;
  border-radius: 50%; background: var(--cream); border: 3px solid var(--umber);
  transition: background-color .3s, box-shadow .3s;
}
.section.is-live .jack i, .panel__slot:hover .jack i { background: var(--yolk); box-shadow: 0 0 0 5px rgba(255, 196, 0, .35); }
.section.is-live .panel__slot:nth-child(2) .jack i { transition-delay: .25s; }
.section.is-live .panel__slot:nth-child(3) .jack i { transition-delay: .5s; }
.section.is-live .panel__slot:nth-child(4) .jack i { transition-delay: .75s; }

/* ---------- Шаги ---------- */
.steps {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px;
  counter-reset: step;
}
.steps__item { position: relative; counter-increment: step; padding-top: 86px; }
.steps__item::before {
  content: counter(step);
  position: absolute; top: 0; left: 0;
  display: grid; place-items: center; width: 60px; height: 60px;
  font: 800 1.35rem/1 var(--font-display);
  color: var(--umber); background: var(--yolk); border-radius: 16px;
}
/* пунктир «поток данных» между шагами */
.steps__item:not(:last-child)::after {
  content: ""; position: absolute; top: 28px; left: 76px; right: -12px; height: 4px;
  background: repeating-linear-gradient(90deg, var(--yolk) 0 8px, transparent 8px 18px);
  background-size: 18px 4px;
}
@media (prefers-reduced-motion: no-preference) {
  .section.is-live .steps__item::after { animation: flow 0.9s linear infinite; }
}
@keyframes flow { to { background-position: 18px 0; } }
.steps__item h3 { font-size: 1.02rem; line-height: 1.25; font-weight: 700; color: var(--yolk); margin-bottom: 12px; }
.steps__item p { font-size: .98rem; margin: 0; color: #F3E7B5; }

/* ---------- Таблица ---------- */
.table-scroll {
  overflow-x: auto;
  border: var(--stroke) solid var(--umber); border-radius: 22px;
  box-shadow: 8px 8px 0 var(--umber);
  background: var(--cream);
}
.compare { width: 100%; min-width: 640px; border-collapse: collapse; font-size: 1rem; }
.compare th, .compare td { padding: 18px 22px; text-align: left; border-bottom: 2px solid rgba(42, 33, 3, .16); }
.compare thead th {
  background: var(--yolk); border-bottom: var(--stroke) solid var(--umber);
  font: 700 .92rem/1.2 var(--font-display);
}
.compare tbody th { font-weight: 700; }
.compare tbody tr:last-child > * { border-bottom: 0; font-weight: 700; background: #FFF1B0; }
.compare tbody tr { transition: background-color .2s; }
.compare tbody tr:hover { background: #FFF4C2; }

/* ---------- Чек-лист ---------- */
.checks { list-style: none; margin: 1.6em 0 0; padding: 0; display: grid; gap: 14px; }
.checks li { position: relative; padding-left: 44px; font-weight: 500; }
.checks li::before {
  content: ""; position: absolute; left: 0; top: -1px; width: 28px; height: 28px;
  background: var(--umber) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23FFC400' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 12.5l4 4 8-9'/%3E%3C/svg%3E") center / 18px no-repeat;
  border-radius: 9px;
}

/* ---------- FAQ ---------- */
.faq { display: grid; gap: 14px; max-width: 860px; }
.faq__item {
  background: var(--cream);
  border: var(--stroke) solid var(--umber); border-radius: 18px;
  transition: box-shadow .25s var(--ease), transform .25s var(--ease);
}
.faq__item[open] { box-shadow: var(--hard); transform: translate(-2px, -2px); }
.faq__item summary {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 20px 24px; cursor: pointer; list-style: none;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary h3 { font: 700 1.08rem/1.35 var(--font-body); }
.faq__item summary::after {
  content: ""; flex: none; width: 34px; height: 34px; border-radius: 50%;
  background:
    linear-gradient(var(--umber), var(--umber)) center / 14px 3px no-repeat,
    linear-gradient(var(--umber), var(--umber)) center / 3px 14px no-repeat,
    var(--yolk);
  border: 2px solid var(--umber);
  transition: transform .3s var(--ease);
}
.faq__item[open] summary::after { transform: rotate(135deg); }
.faq__body { overflow: hidden; padding: 0 24px; }
.faq__body p { padding-bottom: 22px; margin: 0; }

/* ---------- Контакты ---------- */
.contact {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 72px); align-items: start;
}
.contact__nap { display: grid; gap: 8px; margin-top: 1.6em; font-style: normal; font-weight: 700; font-size: 1.1rem; }
.contact__nap span { font-weight: 400; font-size: 1rem; }

.form {
  display: grid; gap: 18px; padding: clamp(22px, 3vw, 36px);
  background: var(--cream);
  border: var(--stroke) solid var(--umber); border-radius: 26px;
  box-shadow: 10px 10px 0 var(--umber);
}
.form__field { display: grid; gap: 7px; }
.form label { font-weight: 700; font-size: .95rem; }
.form input[type="text"], .form input[type="email"], .form textarea {
  width: 100%; padding: 13px 16px;
  font: inherit; color: var(--umber); background: #fff;
  border: 2px solid var(--umber); border-radius: 12px;
  transition: box-shadow .2s, background-color .2s;
}
.form textarea { resize: vertical; min-height: 110px; }
.form input:focus-visible, .form textarea:focus-visible { outline: none; box-shadow: 4px 4px 0 var(--yolk), 4px 4px 0 2px var(--umber); }
.form [aria-invalid="true"] { background: #FFF0E0; border-style: dashed; }
.form__consent { display: flex; align-items: flex-start; gap: 12px; font-weight: 400 !important; }
.form__consent input { width: 22px; height: 22px; margin: 2px 0 0; accent-color: var(--umber); flex: none; }
.form__error { margin: 0; font-size: .9rem; font-weight: 500; color: #8A2A00; }
.form__submit { justify-self: start; }
.form__status { margin: 0; font-weight: 700; min-height: 1.4em; }

/* ---------- Подвал ---------- */
.site-footer { background: var(--umber); color: #F3E7B5; padding: 64px 0 28px; font-size: .98rem; }
.footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.footer__logo { font: 800 1.3rem/1 var(--font-display); color: var(--yolk); margin-bottom: 16px; }
.footer__nav { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer__nav a { text-decoration: none; }
.footer__nav a:hover { color: var(--yolk); text-decoration: underline; }
.footer__bottom {
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  margin-top: 48px; padding-top: 22px; border-top: 2px solid rgba(255, 196, 0, .3);
}
.footer__bottom p { margin: 0; }

/* ==========================================================================
   Адаптив
   ========================================================================== */
@media (max-width: 1020px) {
  .site-nav a { padding: 8px 9px; font-size: .9rem; }
  .panel { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .panel__slot:nth-child(3) { border-left: 0; }
  .panel__slot:nth-child(n+3) { border-top: 2px solid var(--umber); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px 28px; }
  .steps__item:nth-child(2)::after { display: none; }
}

@media (max-width: 860px) {
  :root { --rail: 12px; --gutter: 44px; --pad: 16px; }

  .nav-toggle { display: inline-flex; }
  .header__cta { display: none; }
  .logo { margin-left: 0; }
  .site-nav {
    position: absolute; left: 0; right: 0; top: 100%;
    background: var(--cream); border-bottom: var(--stroke) solid var(--umber);
    display: grid; grid-template-rows: 0fr;
    visibility: hidden;
    transition: grid-template-rows .35s var(--ease), visibility .35s;
  }
  .site-nav.is-open { grid-template-rows: 1fr; visibility: visible; }
  .site-nav__list { flex-direction: column; overflow: hidden; gap: 0; padding: 0 var(--pad); }
  .site-nav__list li:first-child { margin-top: 12px; }
  .site-nav__list li:last-child { margin-bottom: 16px; }
  .site-nav a { padding: 13px 14px; font-size: 1.05rem; }

  .hero__grid, .split, .split--reverse, .contact { grid-template-columns: minmax(0, 1fr); }
  .split--reverse .split__figure { order: 2; }
  .hero__figure { max-width: 460px; }

  .port { width: 22px; height: 22px; left: calc(var(--rail) - 11px); border-radius: 7px; top: 8px; }
  .port::after { inset: 4px; }
  .cable__jacket { stroke-width: 7; }
  .cable__core { stroke-width: 3; }
  .cable__shadow { display: none; }

  .footer__grid { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 560px) {
  .panel, .steps { grid-template-columns: minmax(0, 1fr); }
  .panel__slot + .panel__slot { border-left: 0; border-top: 2px solid var(--umber); }
  .steps__item::after { display: none; }
  .steps__item { padding-top: 76px; }
  .btn--lg { width: 100%; }
  .form__submit { justify-self: stretch; }
}

/* Уважение к настройке «меньше движения» */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation: none !important; }
  .js .section .reveal { opacity: 1; transform: none; }
  .cable__packet { display: none; }
}

@media print {
  .site-header, .cable, .port, .form, .nav-toggle { display: none !important; }
  .js .section .reveal { opacity: 1 !important; transform: none !important; }
}