/* ============================================================
   «Рабочий стол практика» — дизайн-система лендинга AI-занятий.
   Бумага #F6F6F2 · чернила #15181F · единственный акцент —
   синие чернила #2B3A67. Шрифты Onest + JetBrains Mono.
   ============================================================ */

:root {
  --paper:      #F6F6F2;
  --card:       #FFFFFF;
  --ink:        #15181F;
  --graphite:   #5B616E;
  --ink-blue:   #2B3A67;
  --echo:       #E7ECF7;
  --hairline:   #E4E4DC;
  --green:      #1E7A4D;
  --hint:       #B42318;

  --radius:     12px;
  --radius-sm:  8px;
  --radius-lg:  20px;

  --shadow-card: 0 1px 2px rgba(21,24,31,.04), 0 8px 24px -16px rgba(21,24,31,.18);
  --shadow-pop:  0 24px 60px -24px rgba(21,24,31,.35);

  --font: 'Onest', system-ui, -apple-system, 'Segoe UI', Arial, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', 'Consolas', monospace;

  --maxw:   960px;
  --gutter: clamp(20px, 5vw, 40px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.mono { font-family: var(--mono); }

h1, h2, h3 { margin: 0 0 .4em; letter-spacing: -.01em; }
h1 { font-weight: 700; font-size: clamp(2.05rem, 1.4rem + 3vw, 3.4rem); line-height: 1.08; letter-spacing: -.02em; }
h2 { font-weight: 700; font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.2rem); }
h3 { font-weight: 600; font-size: 1.18rem; }
p  { margin: 0 0 1em; }
a  { color: var(--ink-blue); text-decoration: none; }

/* единое видимое выделение фокуса для всех интерактивных элементов */
:focus-visible { outline: 2px solid var(--ink-blue); outline-offset: 2px; border-radius: 4px; }

/* ───────── Кнопки ───────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  font: inherit; font-weight: 600; cursor: pointer; white-space: nowrap;
  border: 1px solid transparent; border-radius: 999px; padding: .68em 1.25em;
  transition: transform .14s ease, box-shadow .2s ease, background .16s ease, border-color .16s ease, color .16s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--ink-blue); color: #fff; }
.btn--primary:hover { box-shadow: var(--shadow-card); transform: translateY(-1px); }
.btn--lg { padding: .92em 1.6em; font-size: 1.05rem; }
.btn--link { background: transparent; color: var(--ink-blue); padding-inline: .3em; border-radius: 4px; }
.btn--link:hover { text-decoration: underline; }
.btn--invert { background: #fff; color: var(--ink-blue); }
.btn--invert:hover { box-shadow: 0 10px 30px -12px rgba(0,0,0,.4); transform: translateY(-1px); }

/* ───────── Шапка ───────── */
.nav {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline);
}
.nav__inner { display: flex; align-items: center; gap: 22px; height: 62px; }
.nav__logo { color: var(--ink); font-weight: 800; letter-spacing: -.02em; }
.nav__links { display: flex; gap: 22px; margin-left: auto; }
.nav__links a { color: var(--graphite); font-size: .96rem; }
.nav__links a:hover { color: var(--ink); }
.nav__price { color: var(--graphite); font-size: .82rem; letter-spacing: .03em; }

/* ───────── Hero ───────── */
.hero { padding: clamp(40px, 6vw, 72px) 0 clamp(48px, 7vw, 88px); }
.hero__inner { display: flex; flex-direction: column; align-items: flex-start; }
.eyebrow {
  font-size: .78rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--graphite); margin: 0 0 22px;
}
.hero h1 { max-width: 18ch; }
.hero__subhead { color: var(--graphite); font-size: clamp(1.04rem, .98rem + .4vw, 1.18rem); max-width: 56ch; margin: .2em 0 1.6em; }
.hero__cta { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-bottom: 12px; }
.hero__reassure { color: var(--graphite); font-size: .9rem; margin: 0 0 22px; }

/* ── Сигнатура: транскрипт занятия ── */
.transcript {
  width: 100%; background: var(--card); border: 1px solid var(--hairline);
  border-radius: var(--radius); box-shadow: var(--shadow-card);
  padding: clamp(18px, 3vw, 26px); margin: 0 0 30px;
  display: flex; flex-direction: column; gap: 14px;
}
.turn { display: flex; flex-direction: column; gap: 6px; }
.turn p { margin: 0; }
.turn__tag {
  font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--graphite);
}
.turn--you { color: var(--graphite); }
.turn--practic {
  background: var(--echo); border-left: 3px solid var(--ink-blue);
  border-radius: var(--radius-sm); padding: 12px 14px; color: var(--ink);
}
.turn--practic .turn__tag { color: var(--ink-blue); }
.prompt {
  display: block; font-family: var(--mono); font-size: .92rem; line-height: 1.5;
  color: var(--ink-blue); background: rgba(43,58,103,.06);
  border-radius: var(--radius-sm); padding: 10px 12px; margin-top: 8px;
  white-space: pre-wrap; word-break: break-word; min-height: 1.5em;
}
.prompt.is-typing::after {
  content: ""; display: inline-block; width: .55ch; height: 1.05em;
  background: var(--ink-blue); margin-left: 2px; vertical-align: -2px;
  animation: caret 1s steps(1) infinite;
}
@keyframes caret { 50% { opacity: 0; } }
.turn--result {
  flex-direction: row; align-items: center; gap: 12px;
  background: var(--echo); border-radius: var(--radius-sm); padding: 12px 14px;
}
.result__check {
  flex: 0 0 auto; width: 26px; height: 26px; border-radius: 50%;
  background: var(--green); color: #fff; display: grid; place-items: center; font-size: .9rem; font-weight: 700;
}
.result__body { display: flex; flex-direction: column; }
.result__meta { color: var(--graphite); font-size: .8rem; margin-top: 2px; }

/* ── Строка «впишите задачу» ── */
.rehearse { display: flex; gap: 8px; width: 100%; max-width: 520px; margin-bottom: 26px; }
.rehearse input {
  flex: 1; font: inherit; color: var(--ink); background: var(--card);
  border: 1px solid var(--hairline); border-radius: var(--radius-sm); padding: 12px 14px; outline: none;
}
.rehearse input::placeholder { color: var(--graphite); }
.rehearse input:focus { border-color: var(--ink-blue); box-shadow: 0 0 0 3px rgba(43,58,103,.18); }
.rehearse .btn { flex: 0 0 auto; }
.rehearse--cta { max-width: 560px; margin: 8px auto 0; }
.rehearse--cta input { background: rgba(255,255,255,.95); border-color: transparent; }

/* ── Факты ── */
.facts {
  list-style: none; padding: 0; margin: 4px 0 0; display: flex; flex-wrap: wrap; gap: 10px 28px;
}
.facts li { display: flex; flex-direction: column; }
.facts__v { color: var(--ink); font-size: .96rem; }
.facts__l { color: var(--graphite); font-size: .72rem; letter-spacing: .04em; }

/* ───────── Секции (один источник вертикального ритма) ───────── */
.section { padding-block: clamp(64px, 9vw, 120px); }
.section__title { text-align: center; }
.section__sub { text-align: center; color: var(--graphite); max-width: 58ch; margin: 0 auto 44px; }

.grid { display: grid; gap: 20px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--card); border: 1px solid var(--hairline); border-radius: var(--radius);
  padding: 26px; transition: box-shadow .18s ease, transform .18s ease;
}
.card:hover { box-shadow: var(--shadow-card); transform: translateY(-2px); }
.card__eyebrow { display: block; font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-blue); margin-bottom: 12px; }
.card h3 { margin-bottom: .3em; }
.card p { color: var(--graphite); margin: 0; }
.honesty { text-align: center; color: var(--graphite); margin: 30px 0 0; font-size: .98rem; }

/* чек-листы */
.checklist { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.checklist li { position: relative; padding-left: 34px; }
.checklist li::before {
  content: "✓"; position: absolute; left: 0; top: 1px;
  width: 22px; height: 22px; border-radius: 50%; background: var(--echo); color: var(--ink-blue);
  display: grid; place-items: center; font-size: .78rem; font-weight: 700;
}
.checklist--tight { gap: 10px; margin: 18px 0; text-align: left; }

/* ───────── Как проходит (шаги + до/после) ───────── */
.steps { list-style: none; counter-reset: none; padding: 0; margin: 0 auto; max-width: 760px; display: grid; gap: 14px; }
.step {
  background: var(--card); border: 1px solid var(--hairline); border-radius: var(--radius);
  padding: 18px 22px; display: grid; grid-template-columns: 190px 1fr; gap: 16px; align-items: baseline;
}
.step__tag { color: var(--ink-blue); font-size: .82rem; letter-spacing: .04em; text-transform: uppercase; }
.step p { margin: 0; color: var(--ink); }

.proof {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: stretch; gap: 14px;
  max-width: 760px; margin: 32px auto 0;
}
.proof__side { border-radius: var(--radius); padding: 20px 22px; }
.proof__side--before { background: var(--card); border: 1px solid var(--hairline); color: var(--graphite); }
.proof__side--after  { background: var(--echo); }
.proof__tag { display: block; font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; margin-bottom: 8px; }
.proof__side--before .proof__tag { color: var(--graphite); }
.proof__side--after  .proof__tag { color: var(--ink-blue); }
.proof__side p { margin: 0; }
.proof__arrow { display: grid; place-items: center; color: var(--ink-blue); font-size: 1.4rem; }

/* ───────── Кто проводит (портфолио) ───────── */
.about {
  display: grid; grid-template-columns: 260px 1fr; gap: 36px; align-items: start;
  max-width: 880px; margin: 0 auto;
}
.about__card { position: sticky; top: 84px; }
.about__photo {
  width: 100%; aspect-ratio: 1 / 1; object-fit: cover; display: block;
  border-radius: var(--radius); border: 1px solid var(--hairline); box-shadow: var(--shadow-card);
}
.about__id { margin-top: 14px; display: flex; flex-direction: column; gap: 2px; }
.about__id strong { font-size: 1.1rem; }
.about__id .mono { color: var(--graphite); font-size: .8rem; letter-spacing: .03em; }
.about__bio p { color: var(--ink); margin: 0 0 1em; }
.about__bio p:first-child { font-size: 1.06rem; }

.about__areas { color: var(--graphite); font-size: .95rem; margin-top: 4px; }

@media (max-width: 880px) {
  .about { grid-template-columns: 1fr; gap: 24px; max-width: 460px; }
  .about__card { position: static; }
}

/* ───────── Цена ───────── */
.price { display: flex; justify-content: center; }
.price__card {
  background: var(--card); border: 1px solid var(--hairline); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card); padding: 34px; max-width: 420px; width: 100%; text-align: center;
}
.price__tag { color: var(--graphite); font-size: .78rem; letter-spacing: .06em; text-transform: uppercase; }
.price__amount { font-size: 2.6rem; font-weight: 800; letter-spacing: -.02em; margin: 8px 0 2px; }
.price__note { color: var(--graphite); }
.price__btn { width: 100%; margin-top: 6px; }
.price__hint { color: var(--graphite); font-size: .85rem; margin: 14px 0 0; }

/* ───────── FAQ ───────── */
.faq { max-width: 720px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--hairline); }
.faq summary { cursor: pointer; font-weight: 600; padding: 18px 0; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--ink-blue); font-size: 1.3rem; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { color: var(--graphite); margin: 0 0 18px; }

/* ───────── Финальный призыв ───────── */
.cta { padding-block: clamp(56px, 8vw, 96px); }
.cta__inner {
  background: var(--ink-blue); color: #fff; border-radius: var(--radius-lg);
  padding: clamp(34px, 6vw, 60px); text-align: center;
}
.cta h2 { color: #fff; }
.cta p { color: rgba(255,255,255,.82); max-width: 52ch; margin: 0 auto 24px; }

/* ───────── Подвал ───────── */
.footer { background: var(--ink); color: #cfd3dc; }
.footer__inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; padding-block: 26px; }
.footer__logo { color: #fff; font-weight: 700; }
.footer__muted { color: #8a90a0; font-size: .9rem; }

/* ============================================================
   Бот-бриф — перекрашен в язык страницы (классы из chat.js
   менять нельзя: .msg.bot/.msg.user/.quick/.chat__field и т.д.)
   ============================================================ */
.chat-fab {
  position: fixed; right: 22px; bottom: 22px; z-index: 40;
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--ink-blue); color: #fff; border: 0; cursor: pointer;
  font: inherit; font-weight: 700; padding: 14px 22px; border-radius: 999px;
  box-shadow: var(--shadow-pop);
}
.chat-fab__dot { width: 9px; height: 9px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 0 rgba(30,122,77,.5); animation: pulse 2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(30,122,77,.5);} 70% { box-shadow: 0 0 0 8px rgba(30,122,77,0);} 100% { box-shadow: 0 0 0 0 rgba(30,122,77,0);} }

.chat__backdrop { position: fixed; inset: 0; background: rgba(21,24,31,.4); z-index: 45; opacity: 0; pointer-events: none; transition: opacity .2s ease; }
.chat {
  position: fixed; right: 22px; bottom: 22px; z-index: 50;
  width: min(400px, calc(100vw - 32px)); height: min(640px, calc(100vh - 40px));
  background: var(--card); border: 1px solid var(--hairline); border-radius: var(--radius-lg);
  display: flex; flex-direction: column; overflow: hidden; box-shadow: var(--shadow-pop);
  transform: translateY(20px) scale(.98); opacity: 0; pointer-events: none;
  transition: transform .22s ease, opacity .22s ease;
}
body.chat-open .chat { transform: none; opacity: 1; pointer-events: auto; }
body.chat-open .chat__backdrop { opacity: 1; pointer-events: auto; }
body.chat-open .chat-fab { display: none; }

.chat__header { display: flex; align-items: center; justify-content: space-between; padding: 16px 18px; background: var(--paper); border-bottom: 1px solid var(--hairline); }
.chat__title { display: flex; align-items: center; gap: 12px; }
.chat__title strong { color: var(--ink); }
.chat__avatar { width: 40px; height: 40px; border-radius: var(--radius-sm); background: var(--ink-blue); display: grid; place-items: center; font-weight: 800; color: #fff; font-size: .9rem; }
.chat__title small { display: block; color: var(--graphite); font-size: .8rem; }
.chat__close { background: transparent; border: 0; color: var(--graphite); font-size: 1.1rem; cursor: pointer; padding: 6px; border-radius: 6px; }
.chat__close:hover { color: var(--ink); }

.chat__body { flex: 1; overflow-y: auto; padding: 18px; display: flex; flex-direction: column; gap: 12px; background: var(--card); }
.msg { max-width: 88%; padding: 11px 14px; border-radius: var(--radius); font-size: .95rem; animation: fadein .25s ease; }
.msg.bot { background: var(--echo); color: var(--ink); align-self: flex-start; border-bottom-left-radius: 4px; }
.msg.user { background: var(--ink-blue); color: #fff; align-self: flex-end; border-bottom-right-radius: 4px; }
.msg.summary { background: var(--card); border: 1px solid var(--hairline); align-self: stretch; max-width: 100%; font-size: .9rem; color: var(--ink); }
.msg.summary b { color: var(--ink-blue); }
@keyframes fadein { from { opacity: 0; transform: translateY(6px);} to { opacity: 1; transform: none; } }

.typing { display: inline-flex; gap: 4px; align-items: center; }
.typing span { width: 7px; height: 7px; border-radius: 50%; background: var(--graphite); animation: blink 1.2s infinite; }
.typing span:nth-child(2) { animation-delay: .2s; } .typing span:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%,60%,100% { opacity: .3; } 30% { opacity: 1; } }

.chat__input { padding: 14px; border-top: 1px solid var(--hairline); background: var(--card); }
.chat__field { display: flex; gap: 8px; }
.chat__field input, .chat__field textarea {
  flex: 1; background: var(--card); border: 1px solid var(--hairline); color: var(--ink);
  border-radius: var(--radius-sm); padding: 12px 14px; font: inherit; resize: none; outline: none;
}
.chat__field input::placeholder, .chat__field textarea::placeholder { color: var(--graphite); }
.chat__field input:focus, .chat__field textarea:focus { border-color: var(--ink-blue); box-shadow: 0 0 0 3px rgba(43,58,103,.2); }
.chat__send { background: var(--ink-blue); color: #fff; border: 0; border-radius: var(--radius-sm); width: 46px; cursor: pointer; font-size: 1.1rem; flex: 0 0 auto; }
.chat__send:disabled { opacity: .5; cursor: default; }

.quick { display: flex; flex-wrap: wrap; gap: 8px; }
.quick button {
  background: var(--card); border: 1px solid var(--hairline); color: var(--ink);
  border-radius: 999px; padding: 9px 15px; cursor: pointer; font: inherit; font-size: .9rem;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.quick button:hover { border-color: var(--ink-blue); background: var(--paper); }

.chat__done { text-align: center; padding: 8px 0; }
.chat__done .ok { font-size: 2.4rem; color: var(--green); }

/* ───────── Адаптив ───────── */
@media (max-width: 880px) {
  .grid--3, .grid--2 { grid-template-columns: 1fr; }
  .nav__links { display: none; }
  .step { grid-template-columns: 1fr; gap: 6px; }
}
@media (max-width: 640px) {
  .proof { grid-template-columns: 1fr; }
  .proof__arrow { transform: rotate(90deg); }
  .facts { gap: 10px 18px; }
}

/* ───────── Reduced motion (бэкстоп; контент остаётся видимым) ───────── */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  html { scroll-behavior: auto; }
  .prompt.is-typing::after { animation: none; }
}