/* ==========================================================================
   TopoAI — общая дизайн-система сайта
   ========================================================================== */

:root {
  --bg:          #080808;
  --bg-soft:     #0c0c0c;
  --surface:     rgba(255, 255, 255, .028);
  --surface-2:   rgba(255, 255, 255, .055);
  --line:        rgba(255, 255, 255, .09);
  --line-2:      rgba(255, 255, 255, .17);
  --text:        #f5f5f5;
  --muted:       rgba(255, 255, 255, .56);
  --dim:         rgba(255, 255, 255, .36);
  --accent:      #ff4a17;
  --accent-2:    #ff7a45;
  --accent-soft: rgba(255, 74, 23, .13);
  --ok:          #46d99a;

  --r-sm: 10px;
  --r:    14px;
  --r-lg: 20px;
  --r-xl: 26px;

  --wrap: 1180px;
  --gutter: clamp(18px, 4vw, 40px);
  --section: clamp(68px, 8.5vw, 122px);

  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
          "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  overflow-x: hidden;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background:
    linear-gradient(rgba(255, 255, 255, .022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .022) 1px, transparent 1px),
    var(--bg);
  background-size: 44px 44px;
  -webkit-font-smoothing: antialiased;
}

img, svg, canvas { display: block; max-width: 100%; }
img { height: auto; }

a { color: inherit; text-decoration: none; }

::selection { background: var(--accent); color: #0a0a0a; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* --------------------------------------------------------------- контейнер */

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section); }

.section--tight { padding-block: clamp(48px, 6vw, 84px); }

.section--cta { padding-block: 0 clamp(56px, 7vw, 104px); }

.section--edge {
  border-top: 1px solid var(--line);
}

/* ------------------------------------------------------------------ шапка */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(8, 8, 8, .72);
  transition: border-color .25s ease, background .25s ease;
}

.site-header.is-stuck {
  border-bottom-color: var(--line);
  background: rgba(8, 8, 8, .94);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -.01em;
}

.brand img { width: 26px; height: 26px; }

/* в шапке знак и надпись крупнее — на фоне полосы 68px мелкие теряются */
.site-header .brand { gap: 11px; font-size: 19.5px; }
.site-header .brand img { width: 32px; height: 32px; }

.brand .accent { color: var(--accent); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  padding: 8px 12px;
  border-radius: var(--r-sm);
  font-size: 14.5px;
  color: var(--muted);
  transition: color .18s ease, background .18s ease;
}

.site-nav a:hover { color: var(--text); background: var(--surface-2); }

.site-nav a[aria-current="page"] { color: var(--text); }

.header-cta { margin-left: 8px; }

@media (max-width: 720px) {
  .site-nav { display: none; }
}

/* ----------------------------------------------------------------- кнопки */

.btn {
  --btn-bg: transparent;
  --btn-fg: var(--text);
  --btn-bd: var(--line-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 17px;
  border: 1px solid var(--btn-bd);
  border-radius: var(--r-sm);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font: inherit;
  font-size: 15px;
  font-weight: 640;
  line-height: 1.3;
  white-space: nowrap;
  cursor: pointer;
  transition: transform .18s ease, background .18s ease,
              border-color .18s ease, box-shadow .18s ease, opacity .18s ease;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  --btn-bg: var(--accent);
  --btn-fg: #0a0a0a;
  --btn-bd: var(--accent);
  box-shadow: 0 8px 30px -10px rgba(255, 74, 23, .8);
}

.btn--primary:hover { box-shadow: 0 14px 38px -12px rgba(255, 74, 23, .9); }

.btn--ghost { --btn-bg: rgba(255, 255, 255, .035); --btn-bd: var(--line); }
.btn--ghost:hover { --btn-bg: rgba(255, 255, 255, .075); --btn-bd: var(--line-2); }

.btn--sm { padding: 8px 13px; font-size: 14px; }

.btn--wide { width: 100%; }

.btn[aria-disabled="true"] {
  opacity: .45;
  pointer-events: none;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

/* ----------------------------------------------------------------- типографика */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .025);
  font-size: 12.5px;
  line-height: 1.2;
  letter-spacing: .015em;
  color: rgba(255, 255, 255, .7);
}

.dot {
  width: 6px; height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px rgba(255, 74, 23, .7);
}

.dot--ok { background: var(--ok); box-shadow: 0 0 14px rgba(70, 217, 154, .6); }

.kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--dim);
}

.kicker::before {
  content: "";
  width: 22px; height: 1px;
  background: var(--accent);
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 720;
  letter-spacing: -.02em;
  line-height: 1.1;
  text-wrap: balance;
}

.h-xl { font-size: clamp(34px, 5vw, 58px); line-height: 1.05; }
.h-lg { font-size: clamp(28px, 3.6vw, 42px); }
.h-md { font-size: clamp(21px, 2.2vw, 27px); line-height: 1.2; }
.h-sm { font-size: 18px; line-height: 1.3; }

.lead {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: clamp(16px, 1.2vw, 17.5px);
  line-height: 1.6;
  color: var(--muted);
}

.muted { color: var(--muted); }
.dimmed { color: var(--dim); }
.accent { color: var(--accent); }
.mono { font-family: var(--mono); }

.section-head { max-width: 66ch; margin-bottom: clamp(30px, 4vw, 52px); }
.section-head .lead { margin-top: 14px; }

/* ------------------------------------------------------- логотип-надпись */

.wordmark {
  display: flex;
  width: fit-content;
  margin: 0;
  font-size: clamp(52px, 5.4vw, 76px);
  line-height: .9;
  font-weight: 740;
  letter-spacing: 0;
  white-space: nowrap;
}

.wordmark span { display: block; }
.wordmark .a, .wordmark .i { color: var(--accent); }
.wordmark .t  { margin-right: -.217em; }
.wordmark .o1 { margin-right: -.072em; }
.wordmark .p  { margin-right: -.045em; }
.wordmark .o2 { margin-right: -.065em; }
.wordmark .a  { margin-right: -.035em; }

/* ------------------------------------------------------------ ASCII-сцена */

.ascii-stage {
  position: relative;
  width: min(100%, 400px);
  aspect-ratio: 1;
  isolation: isolate;
  touch-action: pan-y;
}

.ascii-stage canvas { width: 100%; height: 100%; }

.ascii-stage::after {
  content: "";
  position: absolute;
  inset: 6%;
  z-index: -1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 74, 23, .16), transparent 68%);
  filter: blur(28px);
  pointer-events: none;
}

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

.card {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
}

.card--hover { transition: border-color .22s ease, background .22s ease, transform .22s ease; }
.card--hover:hover {
  border-color: var(--line-2);
  background: rgba(255, 255, 255, .05);
  transform: translateY(-3px);
}

.grid { display: grid; gap: clamp(14px, 1.6vw, 20px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ------------------------------------------------------- рамка «браузера» */

.browser {
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  background: #101010;
  overflow: hidden;
  box-shadow: 0 40px 80px -40px rgba(0, 0, 0, .95),
              0 0 0 1px rgba(255, 255, 255, .02);
}

.browser__bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-bottom: 1px solid var(--line);
  background: #161616;
}

.browser__dots {
  display: flex;
  gap: 6px;
  flex: 0 0 auto;
}

.browser__dots i {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .14);
}

.browser__url {
  flex: 1 1 auto;
  min-width: 0;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .05);
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.browser__body { display: block; background: #fff; }
.browser__body picture { display: block; }
.browser__body img { width: 100%; }

.shot {
  border: 1px solid var(--line-2);
  border-radius: var(--r);
  overflow: hidden;
  background: #fff;
  box-shadow: 0 30px 60px -34px rgba(0, 0, 0, .9);
}

/* ------------------------------------------------------------------ чипы */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .03);
  font-size: 13.5px;
  color: rgba(255, 255, 255, .82);
}

.chip b { font-family: var(--mono); font-weight: 600; letter-spacing: .01em; }
.chip small { color: var(--dim); font-size: 12px; }

/* ------------------------------------------------------------------ списки */

.ticks {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 11px;
}

.ticks li {
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  color: var(--muted);
}

.ticks li::before {
  content: "";
  position: absolute;
  left: 2px; top: .5em;
  width: 11px; height: 6px;
  border-left: 1.6px solid var(--accent);
  border-bottom: 1.6px solid var(--accent);
  transform: rotate(-45deg);
}

.ticks strong { color: var(--text); font-weight: 620; }

/* ------------------------------------------------------------------ футер */

.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 52px 40px;
  background: rgba(0, 0, 0, .35);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: 32px;
}

@media (max-width: 860px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 520px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 26px; }
}

.footer-col h4 {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--dim);
}

.footer-col ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 9px; }
.footer-col a { font-size: 14.5px; color: var(--muted); transition: color .18s ease; }
.footer-col a:hover { color: var(--text); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--dim);
}

/* ------------------------------------------------------------------ прочее */

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .01em;
  border: 1px solid var(--line);
  color: var(--muted);
  background: rgba(255, 255, 255, .03);
}

.badge--free { color: var(--ok); border-color: rgba(70, 217, 154, .32); background: rgba(70, 217, 154, .08); }
.badge--pro  { color: var(--accent); border-color: rgba(255, 74, 23, .35); background: var(--accent-soft); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* --------------------------------------------------- появление при скролле */

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s cubic-bezier(.22, .61, .36, 1),
              transform .7s cubic-bezier(.22, .61, .36, 1);
}

[data-reveal].is-in { opacity: 1; transform: none; }

[data-reveal][data-reveal-delay="1"] { transition-delay: .08s; }
[data-reveal][data-reveal-delay="2"] { transition-delay: .16s; }
[data-reveal][data-reveal-delay="3"] { transition-delay: .24s; }