/* ============================================================
   Документатор — brand system v1
   by bvmax (ООО БВМ)
   ============================================================ */

:root {
  /* Primary ink */
  --ink-900: #0E1B2E;
  --ink-800: #1A2A4A;
  --ink-700: #243657;
  --paper: #FAFAF7;
  --paper-pure: #FFFFFF;

  /* Graphite */
  --graphite-900: #1F2937;
  --graphite-700: #374151;
  --graphite-500: #6B7280;
  --graphite-300: #D1D5DB;
  --graphite-200: #E5E7EB;
  --graphite-100: #F3F4F6;

  /* Indigo (CTA) */
  --indigo-900: #312E81;
  --indigo-800: #3730A3;
  --indigo-700: #4338CA;
  --indigo-600: #4F46E5;
  --indigo-500: #6366F1;
  --indigo-100: #E0E7FF;
  --indigo-50:  #EEF2FF;

  /* Status */
  --success: #15803D;
  --warning: #B45309;
  --error: #B91C1C;
  --info: #1D4ED8;

  /* Typography */
  --font-display: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Spacing scale (4px base) */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-6: 24px;
  --s-8: 32px;
  --s-12: 48px;
  --s-16: 64px;
  --s-24: 96px;
  --s-32: 128px;

  /* Layout */
  --max-w: 1200px;
  --max-w-narrow: 880px;
  --radius: 8px;
  --radius-lg: 12px;
  --border: 1px solid var(--graphite-200);
  --shadow-card: 0 1px 2px rgba(14, 27, 46, 0.04), 0 4px 12px rgba(14, 27, 46, 0.06);
  --shadow-card-hover: 0 2px 4px rgba(14, 27, 46, 0.06), 0 12px 24px rgba(14, 27, 46, 0.10);
}

/* ============================================================
   Reset / base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  color: var(--graphite-900);
  background: var(--paper);
  font-feature-settings: "ss01", "cv02", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
a {
  color: var(--indigo-800);
  text-decoration: none;
  transition: color .15s ease;
}
a:hover { color: var(--indigo-700); text-decoration: underline; text-underline-offset: 3px; }

/* ============================================================
   Typography
   ============================================================ */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink-900);
  margin: 0 0 var(--s-4);
}
h1 { font-size: clamp(36px, 5vw, 64px); font-weight: 800; letter-spacing: -0.03em; }
h2 { font-size: clamp(28px, 3.5vw, 44px); }
h3 { font-size: clamp(20px, 2.2vw, 28px); font-weight: 700; }
h4 { font-size: 18px; font-weight: 600; }

p { margin: 0 0 var(--s-4); }
.lead { font-size: 20px; color: var(--graphite-700); }

code, .mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--graphite-500);
  margin-bottom: var(--s-3);
}

/* ============================================================
   Layout primitives
   ============================================================ */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--s-6);
}
.section { padding: var(--s-24) 0; }
.section--tight { padding: var(--s-16) 0; }
.section--ink {
  background: var(--ink-900);
  color: var(--paper);
}
.section--ink h2, .section--ink h3 { color: var(--paper); }
.section--ink .lead { color: rgba(250, 250, 247, 0.78); }

.grid { display: grid; gap: var(--s-6); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 880px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 14px 24px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .15s ease;
  white-space: nowrap;
}
.btn--primary {
  background: var(--indigo-700);
  color: var(--paper-pure);
}
.btn--primary:hover {
  background: var(--indigo-800);
  color: var(--paper-pure);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(67, 56, 202, 0.25);
}
.btn--ghost {
  background: transparent;
  color: var(--ink-900);
  border-color: var(--graphite-300);
}
.btn--ghost:hover {
  background: var(--paper-pure);
  border-color: var(--ink-900);
  color: var(--ink-900);
  text-decoration: none;
}
.btn--lg { padding: 18px 32px; font-size: 18px; }
.btn--block { width: 100%; justify-content: center; }

.btn-arrow::after {
  content: "→";
  margin-left: var(--s-1);
  transition: transform .15s ease;
}
.btn:hover .btn-arrow::after { transform: translateX(3px); }

/* ============================================================
   Header / nav
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--graphite-200);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--s-3) var(--s-6);
  max-width: var(--max-w);
  margin: 0 auto;
}
.brand-block {
  display: inline-flex;
  align-items: baseline;
  gap: var(--s-2);
}
.brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  color: var(--ink-900);
  letter-spacing: -0.02em;
}
.brand:hover { color: var(--ink-900); text-decoration: none; }
.brand__by {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--graphite-500);
  letter-spacing: 0.04em;
  transition: color .15s ease;
}
.brand__by:hover {
  color: var(--indigo-700);
  text-decoration: none;
}
.nav { display: flex; align-items: center; gap: var(--s-6); }
.nav a { color: var(--graphite-700); font-weight: 500; font-size: 15px; }
.nav a:hover { color: var(--ink-900); text-decoration: none; }
@media (max-width: 720px) {
  .nav__links { display: none; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding: var(--s-16) 0 var(--s-16);
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(67, 56, 202, 0.07), transparent 60%),
    var(--paper);
  position: relative;
  overflow: hidden;
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
}
.hero__inner h1 em { font-style: normal; color: var(--indigo-700); }
.hero__stamp {
  position: absolute;
  right: -40px;
  top: 60px;
  width: 280px;
  height: 280px;
  border: 2px solid var(--graphite-300);
  border-radius: 4px;
  transform: rotate(-8deg);
  opacity: 0.35;
  pointer-events: none;
  display: grid;
  place-items: center;
}
.hero__stamp::before, .hero__stamp::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  border-top: 1px solid var(--graphite-300);
}
.hero__stamp::before { top: 60px; }
.hero__stamp::after { bottom: 60px; }
.hero__stamp-text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--graphite-500);
  text-transform: uppercase;
  text-align: center;
}
@media (max-width: 880px) {
  .hero__stamp { display: none; }
}

.hero__inner {
  max-width: 920px;
  position: relative;
}
.hero h1 { margin-bottom: var(--s-6); }
.hero h1 em {
  font-style: normal;
  color: var(--indigo-700);
}
.hero__lead {
  font-size: clamp(18px, 2vw, 22px);
  color: var(--graphite-700);
  max-width: 700px;
  margin-bottom: var(--s-12);
}

/* ============================================================
   Chat-first hero — input + chips
   ============================================================ */
.chat-box {
  position: relative;
  margin-bottom: var(--s-8);
  max-width: 760px;
}
.chat-input {
  width: 100%;
  min-height: 96px;
  padding: 22px 64px 22px 24px;
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.55;
  color: var(--graphite-900);
  background: var(--paper-pure);
  border: 2px solid var(--graphite-300);
  border-radius: 16px;
  resize: none;
  transition: border-color .15s ease, box-shadow .15s ease;
  -webkit-appearance: none;
}
.chat-input::placeholder { color: var(--graphite-500); }
.chat-input:focus {
  outline: none;
  border-color: var(--indigo-700);
  box-shadow: 0 0 0 4px var(--indigo-100);
}
.chat-submit {
  position: absolute;
  right: 14px;
  top: 14px;
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--indigo-700);
  color: var(--paper-pure);
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: background .15s ease, transform .15s ease;
}
.chat-submit:hover { background: var(--indigo-800); transform: translateY(-1px); }
.chat-submit:focus-visible { outline: 2px solid var(--indigo-700); outline-offset: 2px; }

.chat-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
  margin-top: var(--s-4);
}
@media (max-width: 720px) {
  .chat-chips { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 4px; }
  .chat-chips::-webkit-scrollbar { display: none; }
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  background: var(--paper-pure);
  border: 1px solid var(--graphite-300);
  color: var(--graphite-700);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  border-radius: 999px;
  cursor: pointer;
  transition: all .15s ease;
  white-space: nowrap;
  scroll-snap-align: start;
}
.chip:hover {
  background: var(--indigo-50);
  border-color: var(--indigo-700);
  color: var(--indigo-700);
  transform: translateY(-1px);
}
.chip--upload { color: var(--graphite-500); }
.chip--upload:hover { color: var(--indigo-700); }

.chat-hint {
  margin: var(--s-4) 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--graphite-500);
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
}
.chat-hint__icon {
  display: inline-grid;
  place-items: center;
  width: 18px;
  height: 18px;
  background: var(--graphite-100);
  border-radius: 4px;
  font-size: 11px;
}

/* legacy dual-cta block kept for any other usage; harmless if no markup */
.dual-cta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-6);
  margin-bottom: var(--s-8);
}
@media (max-width: 720px) {
  .dual-cta { grid-template-columns: 1fr; }
}
.cta-card {
  padding: var(--s-8);
  border-radius: var(--radius-lg);
  background: var(--paper-pure);
  border: var(--border);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
  transition: all .2s ease;
}
.cta-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--graphite-300);
  transform: translateY(-2px);
}
.cta-card__icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  background: var(--graphite-100);
  border-radius: 8px;
  font-size: 24px;
}
.cta-card--primary .cta-card__icon {
  background: var(--indigo-100);
  color: var(--indigo-800);
}
.cta-card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--ink-900);
  margin: 0;
}
.cta-card__desc {
  color: var(--graphite-700);
  font-size: 15px;
  margin: 0;
  flex-grow: 1;
}
.cta-card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--graphite-500);
}

.hero__trust {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-4) var(--s-8);
  margin-top: var(--s-12);
  padding-top: var(--s-6);
  border-top: 1px solid var(--graphite-200);
  font-size: 14px;
  color: var(--graphite-500);
  font-family: var(--font-mono);
}
.hero__trust strong { color: var(--graphite-700); font-weight: 600; }

/* ============================================================
   Pain section
   ============================================================ */
.pain__metric {
  text-align: left;
  padding: var(--s-8);
  border-left: 3px solid var(--indigo-700);
  background: var(--paper-pure);
  border-radius: 4px;
}
.pain__metric-value {
  font-family: var(--font-display);
  font-size: clamp(40px, 5vw, 56px);
  font-weight: 800;
  color: var(--ink-900);
  line-height: 1;
  margin-bottom: var(--s-2);
  letter-spacing: -0.03em;
}
.pain__metric-label {
  color: var(--graphite-700);
  font-size: 16px;
}

/* ============================================================
   How it works (3 шага)
   ============================================================ */
.step {
  position: relative;
  padding: var(--s-8);
  background: var(--paper-pure);
  border: var(--border);
  border-radius: var(--radius-lg);
}
.step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--ink-900);
  color: var(--paper);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-weight: 700;
  margin-bottom: var(--s-4);
}
.step h3 { font-size: 20px; margin-bottom: var(--s-2); }
.step p { color: var(--graphite-700); margin: 0; }

/* ============================================================
   Standards table
   ============================================================ */
.standards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--s-3);
  font-family: var(--font-mono);
}
.standard {
  padding: var(--s-4);
  background: var(--paper-pure);
  border: var(--border);
  border-radius: var(--radius);
  font-size: 14px;
}
.standard strong {
  display: block;
  color: var(--ink-900);
  font-weight: 700;
  margin-bottom: var(--s-1);
}
.standard span { color: var(--graphite-500); }

/* ============================================================
   ICP cards
   ============================================================ */
.icp {
  padding: var(--s-8);
  background: var(--paper-pure);
  border: var(--border);
  border-radius: var(--radius-lg);
}
.icp__role {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--indigo-800);
  margin-bottom: var(--s-2);
}
.icp h3 { font-size: 22px; margin-bottom: var(--s-3); }
.icp__pains { color: var(--graphite-700); font-size: 15px; margin: 0; }

/* ============================================================
   Pricing
   ============================================================ */
.pricing {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-4);
}
@media (max-width: 1080px) { .pricing { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .pricing { grid-template-columns: 1fr; } }

.plan {
  padding: var(--s-6);
  background: var(--paper-pure);
  border: var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}
.plan--featured {
  border-color: var(--indigo-700);
  border-width: 2px;
  position: relative;
}
.plan--featured::before {
  content: "Популярный";
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--indigo-700);
  color: var(--paper-pure);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.plan__name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-900);
  margin: 0;
}
.plan__price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: var(--s-2) 0;
}
.plan__price-amount {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 800;
  color: var(--ink-900);
  letter-spacing: -0.02em;
}
.plan__price-period { color: var(--graphite-500); font-size: 14px; }
.plan__quota {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--graphite-700);
  padding: var(--s-2) var(--s-3);
  background: var(--graphite-100);
  border-radius: 6px;
  display: inline-block;
}
.plan ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 14px;
  color: var(--graphite-700);
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  flex-grow: 1;
}
.plan ul li::before {
  content: "✓";
  color: var(--success);
  font-weight: 700;
  margin-right: 8px;
}
.plan ul li.no::before {
  content: "−";
  color: var(--graphite-300);
}

/* ============================================================
   FAQ
   ============================================================ */
.faq {
  max-width: var(--max-w-narrow);
  margin: 0 auto;
}
.faq details {
  border-bottom: 1px solid var(--graphite-200);
  padding: var(--s-4) 0;
}
.faq summary {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-900);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-4);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--graphite-500);
  transition: transform .15s ease;
}
.faq details[open] summary::after { content: "−"; }
.faq details p {
  margin: var(--s-3) 0 0;
  color: var(--graphite-700);
}

/* ============================================================
   CTA banner
   ============================================================ */
.cta-banner {
  background: var(--ink-900);
  color: var(--paper);
  padding: var(--s-16) var(--s-6);
  border-radius: var(--radius-lg);
  text-align: center;
  margin: var(--s-16) auto;
  max-width: var(--max-w-narrow);
}
.cta-banner h2 { color: var(--paper); margin-bottom: var(--s-4); }
.cta-banner p { color: rgba(250, 250, 247, 0.78); margin-bottom: var(--s-8); }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: var(--ink-900);
  color: rgba(250, 250, 247, 0.78);
  padding: var(--s-16) 0 var(--s-8);
  font-size: 14px;
}
.site-footer h4 {
  color: var(--paper);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--s-4);
  font-family: var(--font-mono);
  font-weight: 600;
}
.site-footer a { color: rgba(250, 250, 247, 0.78); }
.site-footer a:hover { color: var(--paper); text-decoration: underline; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: var(--s-2); }
.site-footer__bottom {
  margin-top: var(--s-12);
  padding-top: var(--s-6);
  border-top: 1px solid rgba(250, 250, 247, 0.12);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--s-3);
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(250, 250, 247, 0.55);
}

/* ============================================================
   Cookie banner
   ============================================================ */
.cookie-banner {
  position: fixed;
  bottom: var(--s-4);
  left: var(--s-4);
  right: var(--s-4);
  max-width: 540px;
  margin: 0 auto;
  padding: var(--s-4) var(--s-6);
  background: var(--ink-900);
  color: var(--paper);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(14, 27, 46, 0.25);
  display: flex;
  align-items: center;
  gap: var(--s-4);
  font-size: 13px;
  z-index: 100;
}
.cookie-banner p { margin: 0; color: rgba(250, 250, 247, 0.85); }
.cookie-banner button {
  padding: 8px 16px;
  background: var(--indigo-700);
  color: var(--paper);
  border: none;
  border-radius: 6px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}
.cookie-banner button:hover { background: var(--indigo-800); }
.cookie-banner[hidden] { display: none !important; }