:root {
  --bg: #061018;
  --bg-elev: #0a1c28;
  --text: #e8f4f8;
  --muted: #8ba3b5;
  --teal: #00d4aa;
  --aqua: #38bdf8;
  --line: rgba(255, 255, 255, 0.1);
  --font: 'Montserrat', sans-serif;
  --radius: 20px;
  --max: 1120px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

ul {
  list-style: none;
}

/* ===== Topbar ===== */
.topbar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 28px;
  background: linear-gradient(180deg, rgba(6, 16, 24, 0.92), rgba(6, 16, 24, 0.4) 70%, transparent);
  backdrop-filter: blur(8px);
}

.topbar a {
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  transition: color 0.25s ease;
}

.topbar-back {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 52px;
  padding: 12px 20px;
  font-size: 1rem;
  font-weight: 700;
  color: #042018;
  background: linear-gradient(115deg, var(--teal), var(--aqua));
  border-radius: 999px;
  box-shadow: 0 10px 28px rgba(0, 212, 170, 0.28);
}

.topbar a:hover {
  color: var(--teal);
}

.topbar-back:hover {
  color: #042018;
  filter: brightness(1.06);
}

.topbar-nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 22px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(115deg, var(--teal), var(--aqua));
  color: #042018;
}

.btn-ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.22);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: var(--teal);
  color: var(--teal);
}

/* ===== Media placeholders ===== */
.media-slot {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  aspect-ratio: 16 / 10;
  background:
    linear-gradient(145deg, rgba(0, 212, 170, 0.12), rgba(56, 189, 248, 0.06)),
    var(--bg-elev);
  border: 1px dashed rgba(0, 212, 170, 0.35);
}

.media-slot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 1;
}

.media-slot.is-empty img {
  opacity: 0;
  pointer-events: none;
}

.media-slot.is-empty::before {
  content: attr(data-file);
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  padding: 16px;
  text-align: center;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
  z-index: 1;
}

.media-slot.is-empty::after {
  content: 'Заглушка изображения';
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 1;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(139, 163, 181, 0.75);
}

.media-slot figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-size: 0.78rem;
  color: var(--muted);
  background: linear-gradient(0deg, rgba(6, 16, 24, 0.85), transparent);
}

.media-slot--hero {
  position: absolute;
  inset: 0;
  border: 0;
  border-radius: 0;
  aspect-ratio: auto;
}

.media-slot--tall {
  aspect-ratio: 4 / 5;
  min-height: 320px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-fade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(6, 16, 24, 0.92) 0%, rgba(6, 16, 24, 0.72) 48%, rgba(6, 16, 24, 0.45) 100%),
    linear-gradient(0deg, rgba(6, 16, 24, 0.96) 0%, rgba(6, 16, 24, 0.4) 45%, transparent 72%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 120px 28px 72px;
}

.hero-brand {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 16px;
  opacity: 0;
  animation: fade-up 0.8s ease 0.1s forwards;
}

.hero-title {
  font-size: clamp(1.55rem, 3.6vw, 2.65rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
  max-width: 28ch;
  opacity: 0;
  animation: fade-up 0.85s ease 0.2s forwards;
}

.hero-lead {
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  color: var(--muted);
  max-width: 62ch;
  margin-bottom: 28px;
  opacity: 0;
  animation: fade-up 0.85s ease 0.3s forwards;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  opacity: 0;
  animation: fade-up 0.85s ease 0.4s forwards;
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Sections ===== */
.section {
  position: relative;
  z-index: 1;
  padding: 88px 28px;
}

.section-inner {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
}

.section-inner.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: start;
}

.section-head {
  margin-bottom: 40px;
  max-width: 52ch;
}

.eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--aqua);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 12px;
}

.section-lead {
  color: var(--muted);
  font-size: 1.02rem;
}

.section-note {
  margin-top: 28px;
  color: var(--muted);
  font-size: 0.98rem;
}

.prose h3,
.prose-block h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.prose h3 i,
.prose-block h3 i {
  color: var(--teal);
}

.prose ul,
.prose-block ul,
.feature-item ul,
.scenario ul {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.prose li,
.prose-block li,
.feature-item li,
.scenario li {
  position: relative;
  padding-left: 16px;
  color: var(--muted);
  font-size: 0.95rem;
}

.prose li::before,
.prose-block li::before,
.feature-item li::before,
.scenario li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
}

.prose p,
.prose-block p {
  color: var(--muted);
  margin-bottom: 16px;
}

.prose strong {
  color: var(--text);
  font-weight: 600;
}

/* ===== Problem / solution ===== */
.pair--text {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.prose-block {
  padding: 28px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(10, 28, 40, 0.55);
}

.prose-block--accent {
  border-color: rgba(0, 212, 170, 0.28);
  background: linear-gradient(160deg, rgba(0, 212, 170, 0.1), rgba(10, 28, 40, 0.55));
}

.prose-block .media-slot {
  margin-top: 18px;
}

/* ===== Features ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.feature-item {
  padding: 24px 20px;
  border-top: 1px solid rgba(0, 212, 170, 0.35);
}

.feature-icon {
  display: inline-flex;
  font-size: 1.35rem;
  color: var(--teal);
  margin-bottom: 14px;
}

.feature-item h3 {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 10px;
}

.feature-item .media-slot {
  margin-top: 16px;
}

/* ===== Tables ===== */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
  font-size: 0.92rem;
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.data-table th {
  background: rgba(0, 212, 170, 0.08);
  color: var(--text);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.data-table td {
  color: var(--muted);
}

.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table tbody tr:hover td {
  background: rgba(56, 189, 248, 0.04);
  color: var(--text);
}

.savings {
  margin-top: 28px;
  padding: 24px 26px;
  border-left: 3px solid var(--teal);
  background: rgba(10, 28, 40, 0.65);
}

.savings h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
}

.savings p {
  color: var(--muted);
}

.savings strong {
  color: var(--teal);
}

/* ===== Scenarios ===== */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scenario h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 14px 0 4px;
}

.scenario-sub {
  font-size: 0.82rem;
  color: var(--aqua);
  margin-bottom: 8px;
}

/* ===== Universal ===== */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.industry-grid li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  font-weight: 600;
  font-size: 0.95rem;
}

.industry-grid i {
  color: var(--teal);
  width: 1.25em;
  text-align: center;
}

/* ===== Pilot ===== */
.pilot-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: start;
}

.stat-list {
  display: grid;
  gap: 18px;
}

.stat {
  display: grid;
  gap: 4px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.stat-value {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(115deg, var(--teal), var(--aqua));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat-label {
  color: var(--muted);
  font-size: 0.92rem;
}

/* ===== CTA ===== */
.cta-section {
  position: relative;
  z-index: 1;
  padding: 96px 28px;
  background:
    radial-gradient(ellipse 70% 60% at 50% 100%, rgba(0, 212, 170, 0.16), transparent 60%),
    var(--bg);
}

.cta-inner {
  max-width: var(--max);
  margin: 0 auto;
  text-align: center;
}

.cta-inner .section-title {
  max-width: 22ch;
  margin-left: auto;
  margin-right: auto;
}

.cta-list {
  display: grid;
  gap: 8px;
  margin: 20px auto 28px;
  max-width: 42ch;
  text-align: left;
}

.cta-list li {
  position: relative;
  padding-left: 18px;
  color: var(--muted);
}

.cta-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--aqua);
}

.cta-inner .hero-actions {
  justify-content: center;
  opacity: 1;
  animation: none;
}

/* ===== Footer ===== */
.footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

.footer .btn-ghost {
  min-height: 52px;
  padding: 12px 22px;
  font-size: 1rem;
  border-color: rgba(0, 212, 170, 0.45);
  color: var(--teal);
  background: rgba(0, 212, 170, 0.1);
}

/* ===== Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  transition-delay: calc(var(--d, 0) * 80ms);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .section-inner.split,
  .pair--text,
  .pilot-layout,
  .feature-grid,
  .scenario-grid,
  .industry-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  .topbar {
    padding: 14px 16px;
  }

  .topbar-nav {
    display: none;
  }

  .hero-content,
  .section,
  .cta-section {
    padding-left: 18px;
    padding-right: 18px;
  }

  .hero-content {
    padding-top: 100px;
    padding-bottom: 56px;
  }

  .section {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .section-inner.split,
  .pair--text,
  .pilot-layout,
  .feature-grid,
  .scenario-grid,
  .industry-grid {
    grid-template-columns: 1fr;
  }

  .footer {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ===== Demo chat widget ===== */
.demo-chat {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 70;
  width: min(340px, calc(100vw - 24px));
  height: 420px;
  display: flex;
  flex-direction: column;
  border-radius: 18px;
  overflow: hidden;
  background: rgba(8, 22, 34, 0.92);
  border: 1px solid rgba(0, 212, 170, 0.28);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(14px);
  pointer-events: auto;
}

.demo-chat-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(0, 212, 170, 0.12), transparent);
  flex-shrink: 0;
}

.demo-chat-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-content: center;
  background: linear-gradient(135deg, var(--teal), var(--aqua));
  color: #042018;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.demo-chat-meta {
  display: grid;
  gap: 2px;
  min-width: 0;
  flex: 1;
}

.demo-chat-title {
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
}

.demo-chat-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--muted);
}

.demo-chat-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.2);
  animation: demo-pulse 1.8s ease-in-out infinite;
}

.demo-chat-open {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--teal);
  white-space: nowrap;
}

.demo-chat-log {
  flex: 1;
  overflow-y: auto;
  padding: 14px 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
}

.msg {
  max-width: 88%;
  padding: 10px 12px;
  border-radius: 14px;
  font-size: 0.8rem;
  line-height: 1.4;
  animation: msg-in 0.35s ease;
}

.msg--user {
  align-self: flex-end;
  background: rgba(56, 189, 248, 0.18);
  border: 1px solid rgba(56, 189, 248, 0.28);
  border-bottom-right-radius: 4px;
  color: var(--text);
}

.msg--bot {
  align-self: flex-start;
  background: rgba(0, 212, 170, 0.1);
  border: 1px solid rgba(0, 212, 170, 0.22);
  border-bottom-left-radius: 4px;
  color: var(--text);
}

.msg-typing {
  display: inline-flex;
  gap: 5px;
  align-items: center;
  min-height: 1.2em;
}

.msg-typing span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
  opacity: 0.35;
  animation: typing-dot 1.1s ease-in-out infinite;
}

.msg-typing span:nth-child(2) { animation-delay: 0.15s; }
.msg-typing span:nth-child(3) { animation-delay: 0.3s; }

@keyframes msg-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes typing-dot {
  0%, 80%, 100% { opacity: 0.3; transform: translateY(0); }
  40% { opacity: 1; transform: translateY(-3px); }
}

@keyframes demo-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.18); }
  50% { box-shadow: 0 0 0 5px rgba(0, 212, 170, 0.32); }
}

@media (max-width: 720px) {
  .demo-chat {
    right: 10px;
    bottom: 10px;
    width: min(300px, calc(100vw - 20px));
    height: min(340px, 48vh);
  }

  .demo-chat-title {
    font-size: 0.72rem;
  }

  .msg {
    font-size: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-brand,
  .hero-title,
  .hero-lead,
  .hero-actions,
  .reveal {
    opacity: 1;
    transform: none;
    animation: none;
    transition: none;
  }

  .demo-chat-dot,
  .msg,
  .msg-typing span {
    animation: none;
  }
}