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

:root {
  --hero-from: #0f0c29;
  --hero-mid:  #302b63;
  --hero-to:   #1a1a3e;
  --accent:    #7c6df0;
  --accent2:   #a78bfa;
  --text:      #1a1a2e;
  --muted:     #64748b;
  --border:    #e2e8f0;
  --card-bg:   #fff;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.6;
}

/* ── Nav ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(15, 12, 41, 0.75);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.3px;
}
.btn-nav {
  padding: 8px 20px;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 600;
  transition: background 0.15s, transform 0.1s;
}
.btn-nav:hover { background: #6b5ce7; transform: translateY(-1px); }

/* ── Hero ── */
.hero {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--hero-from) 0%, var(--hero-mid) 55%, var(--hero-to) 100%);
  display: flex;
  align-items: center;
  padding: 80px 24px 60px;
  gap: 48px;
  overflow: hidden;
  position: relative;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(124,109,240,0.18) 0%, transparent 65%);
  pointer-events: none;
}
.hero-inner {
  max-width: 580px;
  margin: 0 auto 0 max(24px, calc(50% - 540px));
  position: relative;
  z-index: 1;
}
.badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  background: rgba(124,109,240,0.25);
  border: 1px solid rgba(124,109,240,0.5);
  color: var(--accent2);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 20px;
}
.hero-sub {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.72);
  margin-bottom: 36px;
  max-width: 480px;
  line-height: 1.7;
}
.btn-hero {
  display: inline-block;
  padding: 14px 32px;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 700;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  box-shadow: 0 4px 24px rgba(124,109,240,0.4);
  margin-bottom: 32px;
}
.btn-hero:hover {
  background: #6b5ce7;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(124,109,240,0.5);
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.hero-tags span {
  padding: 5px 12px;
  border-radius: 6px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.65);
  font-size: 0.8rem;
  font-weight: 500;
}

/* ── Hero visual (mock chat) ── */
.hero-visual {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  z-index: 1;
  margin-right: max(24px, calc(50% - 540px));
}
.mock-card {
  width: 300px;
  background: rgba(255,255,255,0.07);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 16px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.mock-header {
  font-size: 0.82rem;
  font-weight: 600;
  color: rgba(255,255,255,0.6);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 10px;
}
.mock-msg {
  font-size: 0.8rem;
  padding: 8px 12px;
  border-radius: 10px;
  line-height: 1.4;
  max-width: 85%;
}
.mock-msg.user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 3px;
}
.mock-msg.bot {
  align-self: flex-start;
  background: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.85);
  border-bottom-left-radius: 3px;
}
.mock-stat-row {
  display: flex;
  gap: 10px;
}
.mock-stat {
  flex: 1;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 10px;
  padding: 10px 8px;
  text-align: center;
  font-size: 0.7rem;
  color: rgba(255,255,255,0.55);
  font-weight: 500;
}
.mock-stat span {
  display: block;
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 2px;
}

/* ── Shared section styles ── */
.section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}
.section-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.section-title {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
  margin-bottom: 48px;
}

/* ── Features ── */
.features {
  padding: 96px 0;
  background: #fafafa;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 24px;
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  transform: translateY(-4px);
}
.card-icon {
  font-size: 1.8rem;
  margin-bottom: 14px;
}
.card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}
.card p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ── How it works ── */
.how {
  padding: 96px 0;
  background: #fff;
}
.steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  flex-wrap: wrap;
  row-gap: 32px;
}
.step {
  flex: 1;
  min-width: 160px;
  padding: 0 8px;
}
.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  font-weight: 800;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}
.step h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}
.step p {
  font-size: 0.83rem;
  color: var(--muted);
  line-height: 1.6;
}
.step-arrow {
  font-size: 1.4rem;
  color: var(--border);
  padding-top: 10px;
  flex-shrink: 0;
  align-self: flex-start;
}

/* ── Tech stack ── */
.tech {
  padding: 64px 0;
  background: #fafafa;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.tech-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.tech-pills span {
  padding: 8px 18px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--border);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

/* ── CTA ── */
.cta {
  padding: 96px 24px;
  text-align: center;
  background: linear-gradient(135deg, var(--hero-from), var(--hero-mid));
}
.cta h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}
.cta p {
  color: rgba(255,255,255,0.65);
  font-size: 1rem;
  margin-bottom: 36px;
}

/* ── Footer ── */
.footer {
  padding: 24px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

/* ── Responsive ── */
@media (max-width: 860px) {
  .hero { flex-direction: column; text-align: center; padding-top: 100px; }
  .hero-inner { margin: 0 auto; }
  .hero-sub { margin: 0 auto 32px; }
  .hero-tags { justify-content: center; }
  .hero-visual { margin: 0 auto; }
  .step-arrow { display: none; }
}
@media (max-width: 480px) {
  .hero-visual { display: none; }
}