/* 33AI — сайт сервиса, вход, документы.
   Палитра: холодный серый, графит, кобальт. Главный элемент страницы — «адресная строка» для живого демо. */
:root {
  --ink: #14161b;
  --ink-2: #4c525c;
  --paper: #f4f5f7;
  --white: #fff;
  --line: #dde0e6;
  --cobalt: #2b4cff;
  --cobalt-ink: #1a33c7;
  --tint: #e7ebff;
  --ok: #2f7d4f;
  --err: #b42318;
  --r: 12px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }
a { color: var(--cobalt-ink); }
:focus-visible { outline: 3px solid var(--cobalt); outline-offset: 2px; }
.muted { color: var(--ink-2); }
.small { font-size: 14px; }
.center { text-align: center; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }

/* ---- шапка ---- */
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; max-width: 1120px; margin: 0 auto; padding: 18px 20px; }
.logo { display: inline-flex; align-items: center; gap: 6px; text-decoration: none; color: var(--ink); font-weight: 850; font-size: 20px; letter-spacing: -0.02em; }
.logo-mark { display: grid; place-items: center; height: 32px; padding: 0 7px; border-radius: 9px; background: var(--cobalt); color: #fff; font-size: 17px; font-variant-numeric: tabular-nums; }
.top nav { display: flex; align-items: center; gap: 22px; }
.top nav a { color: var(--ink); text-decoration: none; font-size: 15px; }
.top nav a:hover { text-decoration: underline; }
@media (max-width: 640px) { .top nav a:not(.btn) { display: none; } }

/* ---- кнопки и поля ---- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; background: var(--cobalt); color: #fff; border: 0; border-radius: 10px;
  padding: 13px 20px; font: inherit; font-weight: 650; text-decoration: none; cursor: pointer; white-space: nowrap; }
.btn:hover { background: var(--cobalt-ink); }
.btn.ghost { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1.5px var(--ink); }
.btn.ghost:hover { background: var(--ink); color: #fff; }
.btn.small { padding: 8px 14px; font-size: 15px; }
.btn.wide { width: 100%; }
.btn[disabled] { opacity: .55; cursor: wait; }
label { display: block; font-size: 15px; font-weight: 600; margin: 0 0 14px; }
input, textarea, select { display: block; width: 100%; margin-top: 6px; padding: 12px 14px; font: inherit; font-weight: 400; color: var(--ink);
  background: #fff; border: 1.5px solid var(--line); border-radius: 9px; }
input:focus, textarea:focus, select:focus { border-color: var(--ink); outline: none; }
label.check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
label.check input { width: 20px; height: 20px; margin: 2px 0 0; flex: none; }
.err { color: var(--err); min-height: 1.3em; margin: 4px 0 10px; font-size: 15px; }
.note { background: var(--tint); border-radius: 10px; padding: 12px 14px; font-size: 15px; }

/* ---- первый экран ---- */
main > section { max-width: 1120px; margin: 0 auto; padding: 36px 20px; }
.hero { padding-top: 48px !important; padding-bottom: 8px !important; }
.hero h1 { font-size: clamp(34px, 5.4vw, 64px); line-height: .98; letter-spacing: -0.045em; font-weight: 850; margin: 0 0 22px; max-width: 13ch; }
.lead { font-size: clamp(18px, 2vw, 21px); color: var(--ink-2); max-width: 60ch; margin: 0; }
.hero-niche { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.hero-niche h1 { font-size: clamp(34px, 4.6vw, 54px); max-width: 18ch; }
.hero-niche .btn { margin-top: 26px; }
.crumb { font-size: 14px; color: var(--ink-2); margin: 0 0 14px; }

/* ---- живое демо: адресная строка ---- */
.try { padding-top: 28px !important; }
.try-form label { font-size: 15px; color: var(--ink-2); margin-bottom: 10px; }
.urlbar { display: flex; align-items: center; gap: 10px; background: var(--white); border: 2px solid var(--ink); border-radius: 18px;
  padding: 8px 8px 8px 20px; box-shadow: 6px 6px 0 0 var(--tint); }
.urlbar:focus-within { border-color: var(--cobalt); box-shadow: 6px 6px 0 0 var(--tint), 0 0 0 4px var(--tint); }
.urlbar-dot { flex: none; width: 12px; height: 12px; border-radius: 50%; background: var(--cobalt); }
.urlbar input { border: 0; margin: 0; padding: 14px 4px; font-size: clamp(18px, 2.2vw, 24px); font-weight: 600; background: transparent; min-width: 0; }
.urlbar input:focus { outline: none; }
.urlbar .btn { padding: 16px 22px; font-size: 17px; border-radius: 12px; }
.try-note { color: var(--ink-2); font-size: 15px; margin: 22px 0 0; max-width: 70ch; }
@media (max-width: 640px) {
  .urlbar { flex-wrap: wrap; padding: 10px 10px 10px 16px; }
  .urlbar input { flex: 1 1 70%; }
  .urlbar .btn { flex: 1 1 100%; }
}
.try-out:empty { display: none; }
.try-out { margin-top: 26px; }
.progress { display: flex; align-items: center; gap: 14px; background: var(--white); border: 1.5px solid var(--line); border-radius: var(--r); padding: 18px 20px; }
.spinner { flex: none; width: 22px; height: 22px; border-radius: 50%; border: 3px solid var(--tint); border-top-color: var(--cobalt); animation: spin .9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.result { display: grid; grid-template-columns: .9fr 1.1fr; gap: 24px; align-items: start; }
.result-info { background: var(--white); border: 1.5px solid var(--line); border-radius: var(--r); padding: 22px; }
.result-info h3 { margin: 0 0 6px; font-size: 22px; letter-spacing: -0.02em; }
.result-info ul { padding-left: 20px; margin: 12px 0 18px; }
.result-info .btn { margin-top: 6px; }
.result-frame { width: 100%; height: 560px; border: 2px solid var(--ink); border-radius: 16px; background: #fff; }
@media (max-width: 860px) { .result { grid-template-columns: 1fr; } .result-frame { height: 520px; } }

/* ---- каналы ---- */
.channels { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; padding: 0 20px; max-width: 1120px; margin: 18px auto 0; }
.channels li { padding: 18px 18px 18px 0; border-top: 2px solid var(--ink); }
.channels li + li { padding-left: 18px; border-left: 1px solid var(--line); }
.channels b { display: block; font-size: 19px; }
.channels span { color: var(--ink-2); font-size: 15px; }
@media (max-width: 760px) { .channels { grid-template-columns: 1fr 1fr; } .channels li:nth-child(3) { padding-left: 0; border-left: 0; } }

/* ---- возможности ---- */
h2 { font-size: clamp(26px, 3vw, 34px); letter-spacing: -0.03em; line-height: 1.1; margin: 0 0 18px; font-weight: 850; }
.feats dl { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px 32px; margin: 0; }
.feats dt { font-weight: 750; font-size: 18px; margin-bottom: 4px; }
.feats dd { margin: 0; color: var(--ink-2); }
@media (max-width: 860px) { .feats dl { grid-template-columns: 1fr; gap: 18px; } }

/* ---- ниши ---- */
.niches ul { list-style: none; padding: 0; margin: 18px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.niches a { display: block; height: 100%; padding: 16px 18px; background: var(--white); border: 1.5px solid var(--line); border-radius: var(--r); color: var(--ink); text-decoration: none; }
.niches a:hover { border-color: var(--cobalt); }
.niches b { display: block; margin-bottom: 4px; }
.niches span { color: var(--ink-2); font-size: 15px; }
.niches span::before { content: "«"; } .niches span::after { content: "»"; }
@media (max-width: 860px) { .niches ul { grid-template-columns: 1fr; } }

/* ---- пример диалога на страницах ниш ---- */
.sample { margin: 0; background: var(--white); border: 2px solid var(--ink); border-radius: 18px; padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.bubble { max-width: 88%; padding: 11px 14px; border-radius: 14px; font-size: 15.5px; line-height: 1.45; }
.bubble.in { align-self: flex-end; background: var(--ink); color: #fff; border-bottom-right-radius: 4px; }
.bubble.out { align-self: flex-start; background: var(--tint); border-bottom-left-radius: 4px; }
.sample-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.sample-btns span { font-size: 14px; font-weight: 650; padding: 7px 11px; border-radius: 9px; border: 1.5px solid var(--line); }

/* ---- цена ---- */
.price { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.price h2 { font-size: clamp(40px, 5vw, 60px); font-variant-numeric: tabular-nums; }
.price p { max-width: 52ch; }
.price-card { background: var(--white); border: 2px solid var(--ink); border-radius: 18px; padding: 26px; }
.price-card ul { padding-left: 20px; margin: 0 0 22px; }
.price-card li { margin: 7px 0; }
@media (max-width: 860px) { .hero-niche, .price { grid-template-columns: 1fr; gap: 28px; } }

/* ---- подвал ---- */
.foot { max-width: 1120px; margin: 40px auto 0; padding: 28px 20px 44px; border-top: 1.5px solid var(--line); display: grid; gap: 12px; font-size: 14px; }
.foot-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.foot-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }

/* ---- вход ---- */
.auth { padding: 28px 16px 60px; }
.auth-card { width: 100%; max-width: 460px; margin: 0 auto; background: #fff; border: 2px solid var(--ink); border-radius: 18px; padding: 28px; }
.auth-card h1 { margin: 0 0 18px; font-size: 28px; letter-spacing: -0.03em; }
.auth-card .note { margin: 0 0 16px; }

/* ---- документы ---- */
.legal { max-width: 760px; margin: 0 auto; padding: 24px 20px 40px; }
.legal h1 { font-size: 30px; line-height: 1.2; letter-spacing: -0.02em; }
.legal h2 { font-size: 20px; margin-top: 28px; }
.legal p, .legal li { max-width: 72ch; }

@media (prefers-reduced-motion: reduce) { .spinner { animation-duration: 3s; } }

/* ---- блог ---- */
.blog, .article { max-width: 760px; margin: 0 auto; padding: 24px 20px 40px; }
.blog h1 { font-size: clamp(34px, 5vw, 52px); letter-spacing: -0.04em; margin: 8px 0 24px; }
.blog { max-width: 1120px; }
.cats { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 22px; }
.cats a { padding: 7px 14px; border-radius: 999px; border: 1.5px solid var(--line); color: var(--ink); text-decoration: none; font-size: 15px; background: var(--white); }
.cats a small { color: var(--ink-2); }
.cats a.on { background: var(--ink); border-color: var(--ink); color: #fff; }
.cats a.on small { color: #c7cbd3; }
.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 20px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); }
.card a { display: flex; flex-direction: column; height: 100%; background: var(--white); border: 1.5px solid var(--line); border-radius: 14px; overflow: hidden; color: var(--ink); text-decoration: none; transition: border-color .15s, transform .15s; }
.card a:hover { border-color: var(--ink); transform: translateY(-2px); }
.cover { display: block; aspect-ratio: 16 / 9; background: var(--paper, #f4f5f7); overflow: hidden; }
.cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
.cover-ph { width: 100%; height: 100%; display: grid; place-items: center; font-size: 64px; font-weight: 800; color: rgba(20, 22, 27, .55); }
.card-body { display: flex; flex-direction: column; gap: 6px; padding: 16px 18px 18px; flex: 1; }
.card-body .chip { align-self: flex-start; font-size: 13px; padding: 3px 9px; border-radius: 999px; background: var(--tint, #e7ebff); color: var(--cobalt-ink); }
.card-body b { font-size: 19px; line-height: 1.25; letter-spacing: -0.01em; }
.card a:hover b { color: var(--cobalt-ink); }
.card-body .desc { color: var(--ink-2); font-size: 15px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card-body time { margin-top: auto; padding-top: 6px; font-size: 13px; color: var(--ink-2); }
.pager { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin: 32px 0 8px; }
.pager .nums { display: flex; gap: 4px; flex-wrap: wrap; justify-content: center; }
.pager .nums a, .pager .nums span { min-width: 36px; height: 36px; display: grid; place-items: center; border-radius: 8px; text-decoration: none; color: var(--ink); }
.pager .nums a:hover { background: var(--white); }
.pager .nums .cur { background: var(--ink); color: #fff; font-weight: 700; }
.pager .nums .gap { color: var(--ink-2); }
.blog-total { text-align: center; }
.related { padding-top: 0; }
.related h2 { font-size: 26px; margin: 0 0 16px; }
@media (max-width: 560px) {
  .pager .nums { display: none; }
  .cards { gap: 12px; }
  .card a { flex-direction: row; }
  .cover { flex: none; width: 104px; aspect-ratio: auto; }
  .cover-ph { font-size: 38px; }
  .card-body { padding: 12px 14px; gap: 4px; }
  .card-body b { font-size: 17px; }
  .card-body .desc { -webkit-line-clamp: 2; font-size: 14px; }
}
.article article { font-size: 18px; line-height: 1.65; }
.article article h1 { font-size: clamp(30px, 4.4vw, 44px); line-height: 1.1; letter-spacing: -0.03em; margin: 6px 0 20px; }
.article article h2 { font-size: 26px; margin: 34px 0 10px; }
.article article h3 { font-size: 21px; margin: 26px 0 8px; }
.article article img { max-width: 100%; height: auto; border-radius: 10px; }
.article article table { border-collapse: collapse; width: 100%; display: block; overflow-x: auto; }
.article article td, .article article th { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.article article blockquote { margin: 18px 0; padding: 4px 18px; border-left: 4px solid var(--cobalt); color: var(--ink-2); }
.article-cta { margin-top: 40px; background: var(--white); border: 2px solid var(--ink); border-radius: 16px; padding: 22px; }
.article-cta b { font-size: 20px; }
.article-cta p { color: var(--ink-2); margin: 6px 0 14px; }

/* ---- главная: условия, пример, схема, тариф, FAQ, данные ---- */
.hero-terms { display: flex; flex-wrap: wrap; gap: 6px 10px; align-items: baseline; margin: 18px 0 0; font-size: 17px; color: var(--ink-2); }
.hero-terms b { color: var(--ink); font-size: 19px; }
.hero-terms span { color: var(--line); font-weight: 700; }
.try-note a { white-space: nowrap; }
.demo-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 28px; align-items: start; }
.sample-long .bubble { max-width: 82%; }
.demo-side { display: grid; gap: 14px; }
.demo-card { background: var(--white); border: 1.5px solid var(--line); border-radius: var(--r); padding: 16px 18px; }
.demo-card b { display: block; margin-bottom: 4px; }
.demo-card p { margin: 0; color: var(--ink-2); font-size: 15px; }
@media (max-width: 860px) { .demo-grid { grid-template-columns: 1fr; } }
.flow ol { list-style: none; counter-reset: f; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.flow li { counter-increment: f; background: var(--white); border: 1.5px solid var(--line); border-radius: var(--r); padding: 18px; }
.flow li::before { content: counter(f); display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--cobalt); color: #fff; font-weight: 800; margin-bottom: 10px; }
.flow b { display: block; font-size: 18px; margin-bottom: 4px; }
.flow span { color: var(--ink-2); font-size: 15px; }
@media (max-width: 860px) { .flow ol { grid-template-columns: 1fr; } }
.terms { padding-left: 18px; margin: 14px 0; color: var(--ink-2); max-width: 56ch; }
.terms li { margin: 8px 0; }
.terms b { color: var(--ink); }
.faq > *, .data > * { max-width: 820px; }
.faq details { border-top: 1.5px solid var(--line); }
.faq details:last-of-type { border-bottom: 1.5px solid var(--line); }
.faq summary { cursor: pointer; padding: 16px 30px 16px 0; font-weight: 700; font-size: 17px; list-style: none; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 12px; font-size: 24px; font-weight: 400; color: var(--ink-2); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 18px; color: var(--ink-2); max-width: 70ch; }

.data ul { padding-left: 18px; margin: 0 0 12px; }
.data li { margin: 10px 0; color: var(--ink-2); }
.data b { color: var(--ink); }

.stages { list-style: none; padding: 0; margin: 0 0 6px; display: grid; gap: 6px; }
.stages li { color: var(--ink-2); padding-left: 26px; position: relative; }
.stages li::before { content: "○"; position: absolute; left: 4px; }
.stages li.now { color: var(--ink); font-weight: 700; }
.stages li.now::before { content: ""; width: 12px; height: 12px; top: 6px; left: 3px; border: 2px solid var(--cobalt); border-right-color: transparent; border-radius: 50%; animation: spin .8s linear infinite; }
.stages li.done { color: var(--ok); }
.stages li.done::before { content: "✓"; }
.steps-progress { display: block !important; }