:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a26;
  --fg-primary: #f0f0f5;
  --fg-secondary: #9898a8;
  --fg-muted: #5a5a6e;
  --accent: #3b82f6;
  --accent-glow: #2563eb;
  --accent-light: rgba(59, 130, 246, 0.12);
  --green: #22c55e;
  --border: rgba(255,255,255,0.06);
  --radius: 12px;
  --max-width: 1140px;
}

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

body {
  background: var(--bg-primary);
  color: var(--fg-primary);
  font-family: 'DM Sans', sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  line-height: 1.15;
}

.gradient-text {
  background: linear-gradient(135deg, #3b82f6 0%, #06b6d4 50%, #3b82f6 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* NAV */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 24px;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, #3b82f6, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 14px;
  color: white;
}

.logo-mark.small {
  width: 28px;
  height: 28px;
  font-size: 11px;
}

.logo-text {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 18px;
  color: var(--fg-primary);
}

/* HERO */
.hero {
  padding: 140px 24px 80px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 100px;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
  border: 1px solid rgba(59,130,246,0.2);
}

.hero h1 {
  font-size: clamp(40px, 5vw, 64px);
  margin-bottom: 24px;
  letter-spacing: -1.5px;
}

.hero-sub {
  font-size: 17px;
  color: var(--fg-secondary);
  max-width: 480px;
  line-height: 1.7;
}

/* CHAT SIM */
.chat-sim {
  background: var(--bg-card);
  border-radius: 16px;
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.chat-header {
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--border);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 500;
}

.chat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.chat-dot.green { background: var(--green); box-shadow: 0 0 8px rgba(34,197,94,0.5); }

.chat-status {
  margin-left: auto;
  color: var(--green);
  font-size: 12px;
  font-weight: 400;
}

.chat-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.msg {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.5;
}

.msg-label {
  display: block;
  font-size: 11px;
  margin-bottom: 4px;
  font-weight: 500;
}

.msg.incoming {
  background: var(--bg-secondary);
  color: var(--fg-primary);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.msg.incoming .msg-label { color: var(--fg-muted); }

.msg.outgoing {
  background: linear-gradient(135deg, rgba(59,130,246,0.15), rgba(6,182,212,0.1));
  border: 1px solid rgba(59,130,246,0.2);
  color: var(--fg-primary);
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.msg.outgoing .msg-label { color: var(--accent); }

/* PROBLEM */
.problem {
  padding: 100px 24px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.problem-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-label {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 48px;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}

.stat-number {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(48px, 6vw, 72px);
  font-weight: 700;
  line-height: 1;
  margin-bottom: 12px;
  background: linear-gradient(180deg, var(--fg-primary) 0%, var(--fg-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.problem-stat p {
  color: var(--fg-secondary);
  font-size: 15px;
  line-height: 1.6;
}

.problem-kicker {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 22px;
  color: var(--fg-primary);
  border-top: 1px solid var(--border);
  padding-top: 32px;
}

/* FEATURES */
.features {
  padding: 100px 24px;
}

.features-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.feature-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  transition: border-color 0.3s, transform 0.3s;
}

.feature-card:hover {
  border-color: rgba(59,130,246,0.3);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 28px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--fg-primary);
}

.feature-card p {
  color: var(--fg-secondary);
  font-size: 15px;
  line-height: 1.6;
}

/* STATS */
.stats {
  padding: 100px 24px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stats-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.stats-text h2 {
  font-size: clamp(28px, 3.5vw, 40px);
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.stats-text p {
  color: var(--fg-secondary);
  font-size: 16px;
  line-height: 1.7;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.stat-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
}

.stat-val {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
}

.stat-desc {
  font-size: 13px;
  color: var(--fg-secondary);
}

/* CLOSING */
.closing {
  padding: 120px 24px;
  text-align: center;
}

.closing-inner {
  max-width: 800px;
  margin: 0 auto;
}

.closing h2 {
  font-size: clamp(26px, 3.5vw, 40px);
  margin-bottom: 24px;
  letter-spacing: -0.5px;
  line-height: 1.3;
}

.closing-sub {
  color: var(--fg-secondary);
  font-size: 17px;
  line-height: 1.7;
  max-width: 580px;
  margin: 0 auto;
}

/* FOOTER */
.footer {
  padding: 32px 24px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 15px;
}

.footer-copy {
  color: var(--fg-muted);
  font-size: 13px;
}

/* MOBILE */
@media (max-width: 768px) {
  .hero { padding: 110px 20px 60px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { order: -1; }
  .problem-grid { grid-template-columns: 1fr; gap: 32px; }
  .feature-cards { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
  .problem, .features, .stats { padding: 60px 20px; }
  .closing { padding: 80px 20px; }
}