:root {
  --bg: #f7f9fb;
  --surface: #ffffff;
  --ink: #15202b;
  --muted: #64748b;
  --line: #d8e1ea;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --blue: #2563eb;
  --amber: #b45309;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 0 5vw;
  background: rgba(247, 249, 251, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  object-fit: cover;
}

nav {
  display: flex;
  gap: 22px;
  color: var(--muted);
  font-weight: 700;
  font-size: 14px;
}

nav a:hover {
  color: var(--primary);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.85fr);
  gap: 48px;
  align-items: center;
  min-height: calc(100vh - 68px);
  padding: 56px 5vw 44px;
  background:
    linear-gradient(90deg, rgba(15, 118, 110, 0.08), transparent 46%),
    #eef5f4;
}

.hero h1,
.section h2 {
  margin: 0;
  line-height: 1.04;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 760px;
  font-size: clamp(44px, 8vw, 88px);
}

.lead {
  max-width: 720px;
  margin: 24px 0 0;
  color: #334155;
  font-size: 20px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.primary-action,
.secondary-action,
.chat-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 8px;
  font-weight: 800;
}

.primary-action,
.chat-form button {
  border: 0;
  background: var(--primary);
  color: white;
}

.secondary-action {
  border: 1px solid var(--line);
  background: white;
  color: var(--ink);
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 520px;
}

.device-shell {
  width: min(330px, 78vw);
  aspect-ratio: 9 / 17.5;
  padding: 12px;
  background: #0f172a;
  border-radius: 34px;
  box-shadow: var(--shadow);
}

.device-shell img {
  width: 100%;
  height: 100%;
  border-radius: 24px;
  object-fit: cover;
  object-position: top center;
}

.signal-panel {
  position: absolute;
  right: 0;
  bottom: 52px;
  display: grid;
  gap: 2px;
  width: 210px;
  padding: 18px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.signal-panel span,
.signal-panel small {
  color: var(--muted);
}

.signal-panel strong {
  font-size: 26px;
}

.section {
  padding: 72px 5vw;
}

.alt-section {
  background: #ffffff;
  border-block: 1px solid var(--line);
}

.section-heading {
  max-width: 820px;
  margin-bottom: 28px;
}

.section h2 {
  font-size: clamp(30px, 4vw, 52px);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.metric-card,
.workflow-item,
.feature-list > div,
.question-panel,
.chat-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.metric-card {
  min-height: 150px;
  padding: 20px;
}

.metric-card span,
.workflow-item span {
  color: var(--muted);
  font-weight: 700;
}

.metric-card strong {
  display: block;
  margin: 10px 0;
  font-size: 30px;
}

.metric-card small {
  color: var(--primary-dark);
  font-weight: 800;
}

.workflow-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.workflow-item {
  min-height: 230px;
  padding: 18px;
}

.workflow-item strong {
  display: block;
  margin: 16px 0 8px;
  font-size: 19px;
}

.workflow-index {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #e0f2f1;
  color: var(--primary-dark);
  font-weight: 900;
}

.two-column,
.assistant-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 28px;
  align-items: start;
}

.two-column p {
  color: var(--muted);
  font-size: 18px;
}

.feature-list {
  display: grid;
  gap: 12px;
}

.feature-list > div {
  display: grid;
  gap: 4px;
  min-height: 88px;
  padding: 18px;
}

.feature-list span {
  color: var(--muted);
}

.assistant-section {
  background: #edf6f5;
}

.question-panel {
  padding: 18px;
}

.question-panel h3 {
  margin: 0 0 14px;
  font-size: 18px;
}

.suggestion-list {
  display: grid;
  gap: 10px;
}

.suggestion-list button {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  font-weight: 750;
  text-align: left;
  cursor: pointer;
}

.suggestion-list button:hover {
  border-color: var(--primary);
}

.chat-panel {
  overflow: hidden;
}

.chat-log {
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: 440px;
  padding: 18px;
  overflow-y: auto;
  background: #fbfdff;
}

.message {
  max-width: 82%;
  padding: 12px 14px;
  border-radius: 8px;
  white-space: pre-wrap;
}

.message.bot {
  align-self: flex-start;
  background: #eef7f6;
  border: 1px solid #c9e6e2;
}

.message.user {
  align-self: flex-end;
  background: #e9efff;
  border: 1px solid #c7d7fe;
}

.chat-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 86px;
  gap: 10px;
  padding: 12px;
  border-top: 1px solid var(--line);
  background: #ffffff;
}

.chat-form input {
  min-width: 0;
  min-height: 46px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  font: inherit;
}

.chat-form input:focus {
  border-color: var(--primary);
  outline: 3px solid rgba(15, 118, 110, 0.14);
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 28px 5vw;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 980px) {
  .hero,
  .two-column,
  .assistant-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-visual {
    min-height: 460px;
  }

  .metric-grid,
  .workflow-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    padding-block: 12px;
  }

  nav {
    width: 100%;
    justify-content: space-between;
    gap: 10px;
  }

  .hero {
    padding-top: 36px;
  }

  .hero h1 {
    font-size: 42px;
  }

  .lead {
    font-size: 17px;
  }

  .metric-grid,
  .workflow-list {
    grid-template-columns: 1fr;
  }

  .signal-panel {
    right: auto;
    bottom: 16px;
    width: min(250px, 86vw);
  }

  .chat-log {
    height: 420px;
  }

  .message {
    max-width: 94%;
  }

  .chat-form {
    grid-template-columns: 1fr;
  }

  footer {
    flex-direction: column;
  }
}