:root {
  --bg: #0b1220;
  --bg-soft: #111a2e;
  --card: #16213a;
  --text: #e8eefc;
  --muted: #9aa8c7;
  --accent: #22c55e;
  --accent-2: #38bdf8;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 14px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.container.narrow {
  width: min(640px, 92%);
}

a {
  color: var(--accent-2);
  text-decoration: none;
}

.topbar {
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(11, 18, 32, 0.85);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.logo {
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.5px;
}

.logo span {
  color: var(--accent);
}

nav {
  display: flex;
  gap: 18px;
  align-items: center;
}

nav a {
  color: var(--muted);
  font-size: 0.95rem;
}

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

.btn {
  display: inline-block;
  background: var(--accent);
  color: #06210f;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  transition: transform 0.15s ease, filter 0.15s ease;
}

.btn:hover {
  filter: brightness(1.05);
  transform: translateY(-1px);
}

.btn-small {
  padding: 8px 16px;
  font-size: 0.9rem;
  color: #06210f !important;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-block {
  width: 100%;
  margin-top: 8px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.hero {
  padding: 72px 0 56px;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(34, 197, 94, 0.16), transparent 55%),
    radial-gradient(ellipse at 80% 20%, rgba(56, 189, 248, 0.12), transparent 50%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  background: rgba(34, 197, 94, 0.15);
  color: var(--accent);
  border: 1px solid rgba(34, 197, 94, 0.35);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
}

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
  margin: 14px 0 12px;
  letter-spacing: -1px;
}

.lead {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 22px;
}

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

.hero-points {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  padding: 0;
  margin: 22px 0 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.92rem;
}

.hero-points li::before {
  content: "✓ ";
  color: var(--accent);
  font-weight: 700;
}

.hero-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}

.chat {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chat-bubble {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 0.95rem;
}

.chat-bubble.in {
  background: #1f2b47;
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.chat-bubble.out {
  background: #14532d;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.section {
  padding: 64px 0;
}

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

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  text-align: center;
  margin: 0 0 32px;
  letter-spacing: -0.5px;
}

.section-sub {
  text-align: center;
  color: var(--muted);
  margin-top: -18px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  padding: 0;
  margin: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.steps span {
  color: var(--muted);
  font-size: 0.95rem;
}

.form {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: var(--shadow);
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 0.88rem;
  color: var(--muted);
}

.field input {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 12px;
  color: var(--text);
  font-size: 1rem;
}

.field input:focus {
  outline: 2px solid rgba(56, 189, 248, 0.45);
  border-color: transparent;
}

.form-msg {
  min-height: 1.2em;
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
  text-align: center;
}

.form-msg.error {
  color: #f87171;
}

.form-msg.ok {
  color: var(--accent);
}

.success {
  background: var(--card);
  border: 1px solid rgba(34, 197, 94, 0.4);
  border-radius: var(--radius);
  padding: 26px;
  text-align: center;
}

.success code {
  background: var(--bg);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.9rem;
}

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

.footer {
  border-top: 1px solid var(--border);
  padding: 22px 0 34px;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

@media (max-width: 820px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .row {
    grid-template-columns: 1fr;
  }

  nav a:not(.btn) {
    display: none;
  }
}