:root {
  --primary: #00086b;
  --accent: #edf0ff;
  --dark: #101828;
  --muted: #667085;
  --border: #e4e7ec;
  --bg: #f8fafc;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--dark);
}

.hero {
  background: linear-gradient(135deg, #ffffff 0%, #eef1ff 100%);
  padding: 24px 20px 70px;
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
}

.logo {
  width: 240px;
  max-width: 80vw;
  height: auto;
}

.hero-content {
  max-width: 900px;
  margin: 70px auto 0;
  text-align: center;
}

.eyebrow {
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4.8rem);
  margin: 10px 0;
  color: var(--primary);
}

.subtitle {
  font-size: 1.25rem;
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto 30px;
  line-height: 1.6;
}

.button,
.chat-form button {
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 999px;
  padding: 14px 22px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

.info-grid {
  max-width: 1100px;
  margin: -35px auto 40px;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.info-grid article,
.chat-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: 0 18px 45px rgba(16, 24, 40, 0.08);
}

.info-grid article {
  padding: 24px;
}

.info-grid h2 {
  color: var(--primary);
  margin-top: 0;
}

.info-grid p {
  color: var(--muted);
  line-height: 1.6;
}

.chat-section {
  max-width: 900px;
  margin: 0 auto 60px;
  padding: 0 20px;
}

.chat-card {
  overflow: hidden;
}

.chat-header {
  padding: 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 18px;
  align-items: center;
  background: #ffffff;
}

.chat-header img {
  width: 150px;
  height: auto;
}

.chat-header h2,
.chat-header p {
  margin: 0;
}

.chat-header p {
  color: var(--muted);
  margin-top: 4px;
}

.messages {
  height: 380px;
  overflow-y: auto;
  padding: 24px;
  background: #fbfcff;
}

.message {
  max-width: 78%;
  padding: 13px 16px;
  margin-bottom: 12px;
  border-radius: 18px;
  line-height: 1.5;
  white-space: pre-wrap;
}

.message.bot {
  background: var(--accent);
  color: var(--dark);
  border-bottom-left-radius: 6px;
}

.message.user {
  margin-left: auto;
  background: var(--primary);
  color: var(--white);
  border-bottom-right-radius: 6px;
}

.chat-form {
  display: flex;
  gap: 12px;
  padding: 18px;
  border-top: 1px solid var(--border);
  background: var(--white);
}

.chat-form input {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 14px 18px;
  font-size: 1rem;
}

.chat-form input:focus {
  outline: 2px solid #c7ccff;
}

footer {
  text-align: center;
  padding: 26px;
  color: var(--muted);
}

@media (max-width: 800px) {
  .info-grid {
    grid-template-columns: 1fr;
    margin-top: 24px;
  }

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

  .message {
    max-width: 92%;
  }

  .chat-form {
    flex-direction: column;
  }
}