:root {
  --bg: #fafbfc;
  --bg-soft: #f3f7fb;
  --card: #ffffff;
  --text: #1a1d21;
  --muted: #5c6370;
  --line: rgba(92, 99, 112, 0.16);
}

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

body {
  margin: 0;
  font-family: "Noto Sans SC", "DM Sans", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: clamp(54px, 9vw, 92px) 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: #1976d2;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4.8vw, 3.3rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

h2 {
  margin: 0 0 20px;
  font-size: clamp(1.55rem, 3vw, 2.1rem);
}

h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.hero-lead {
  margin: 18px 0 0;
  color: var(--muted);
  line-height: 1.75;
  max-width: 560px;
}

.chat-demo {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(243, 247, 251, 0.95));
  border-radius: 18px;
  box-shadow: 0 12px 30px rgba(26, 29, 33, 0.08);
  overflow: hidden;
}

.chat-head {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 8px;
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #c7d2e0;
}

.dot:first-child {
  background: #2196f3;
}

.chat-body {
  padding: 16px;
  display: grid;
  gap: 12px;
}

.msg {
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 0.93rem;
  line-height: 1.6;
}

.msg.user {
  background: rgba(33, 150, 243, 0.1);
  border: 1px solid rgba(33, 150, 243, 0.22);
}

.msg.ai {
  background: rgba(33, 150, 243, 0.1);
  border: 1px solid rgba(33, 150, 243, 0.2);
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.compare-card,
.feature-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
}

.compare-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.8;
}

.before {
  border-left: 3px solid #64748b;
}

.after {
  border-left: 3px solid #2196f3;
}

.section-dark {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-ill {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 1.45rem;
  background: rgba(33, 150, 243, 0.12);
  margin-bottom: 12px;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

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

.metric {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
}

.metric strong {
  display: block;
  color: #1976d2;
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.metric span {
  color: var(--muted);
  font-size: 0.9rem;
}

.cta {
  text-align: center;
}

.cta-inner {
  background: linear-gradient(135deg, rgba(33, 150, 243, 0.12), rgba(33, 150, 243, 0.04));
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: clamp(30px, 5vw, 50px);
}

@media (max-width: 980px) {
  .hero-grid,
  .compare-grid,
  .feature-grid,
  .dashboard {
    grid-template-columns: 1fr;
  }
}