:root {
  color-scheme: dark;
  --bg: #0b0f14;
  --surface: #11161d;
  --surface-2: #1a212b;
  --text: #f2f5f8;
  --muted: #8b98a8;
  --blue: #0a84ff;
  --border: rgba(255, 255, 255, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 15, 20, 0.9);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  text-decoration: none;
}

.brand img {
  border-radius: 8px;
}

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

.lang-toggle {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 12px;
  font-size: 13px;
  cursor: pointer;
}

.lang-toggle:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.3);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 10px;
  background: var(--blue);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.button:hover {
  filter: brightness(1.1);
}

.button-small {
  padding: 8px 14px;
  font-size: 14px;
}

.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 72px 20px 64px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: 44px;
  line-height: 1.15;
  margin: 0 0 16px;
}

.lead {
  color: var(--muted);
  font-size: 18px;
  margin: 0 0 24px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.muted {
  color: var(--muted);
}

.app-window {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  overflow: hidden;
}

.window-bar {
  height: 40px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}

.traffic {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.traffic-close { background: #ff5f57; }
.traffic-min { background: #febc2e; }
.traffic-full { background: #28c840; }

.window-title {
  margin-left: 8px;
  font-size: 13px;
  color: var(--muted);
}

.window-body {
  display: grid;
  grid-template-columns: 140px 1fr;
  min-height: 340px;
}

.window-side {
  background: var(--surface-2);
  border-right: 1px solid var(--border);
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.side-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg);
  border-radius: 8px;
  padding: 3px;
  margin-bottom: 8px;
  font-size: 11px;
}

.side-tabs span {
  flex: 1;
  text-align: center;
  padding: 5px 0;
  border-radius: 6px;
  color: var(--muted);
}

.side-tabs .active {
  background: var(--surface);
  color: var(--text);
}

.side-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--muted);
}

.side-item.active {
  background: var(--blue);
  color: #fff;
}

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

.dot.blue { background: var(--blue); }
.dot.teal { background: #0d9488; }
.dot.green { background: #30d158; }
.dot.orange { background: #ff9f0a; }
.dot.purple { background: #615ced; }

.window-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.chat-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

.avatar {
  width: 24px;
  height: 24px;
  border-radius: 7px;
  background: #10a37f;
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 700;
}

.status {
  margin-left: auto;
  font-size: 10px;
  color: #30d158;
  background: rgba(48, 209, 88, 0.15);
  padding: 3px 8px;
  border-radius: 999px;
}

.chat-body {
  flex: 1;
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.bubble {
  max-width: 82%;
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 13px;
}

.bubble.user {
  align-self: flex-end;
  background: var(--blue);
  color: #fff;
}

.bubble.bot {
  align-self: flex-start;
  background: var(--surface-2);
}

.chat-composer {
  margin: 0 12px 12px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--muted);
}

.composer-send {
  background: var(--blue);
  color: #fff;
  padding: 6px 12px;
  border-radius: 8px;
}

.features {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px 72px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.feature h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.download {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px 72px;
}

.download h2 {
  font-size: 28px;
  margin: 0 0 20px;
}

.download-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
}

.download-card strong {
  font-size: 20px;
}

.hash {
  font-size: 11px;
  word-break: break-all;
  color: var(--muted);
}

.note {
  color: var(--muted);
  font-size: 13px;
  margin-top: 12px;
}

.agents {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px 72px;
}

.agents h2 {
  font-size: 28px;
  margin: 0 0 18px;
}

.agent-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.agent-chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
}

.contact {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px 72px;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
}

.author-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--blue);
  flex: none;
}

.author-main {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 180px;
}

.author-main strong {
  font-size: 18px;
}

.author-main span {
  color: var(--muted);
  font-size: 13px;
}

.contact-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-left: auto;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 10px;
  text-decoration: none;
  color: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: default;
}

.contact-link svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.contact-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.25;
}

.contact-text small {
  color: var(--muted);
  font-size: 11px;
  font-weight: 500;
}

footer {
  border-top: 1px solid var(--border);
  padding: 24px 20px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 760px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 40px;
  }

  .hero h1 {
    font-size: 34px;
  }

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

  .download-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-links {
    margin-left: 0;
  }
}