:root {
  --bg: #0e0e0e;
  --panel: #131313;
  --panel-2: #191a1a;
  --line: rgba(72, 72, 72, 0.28);
  --text: #e7e5e5;
  --muted: #acabaa;
  --dim: #7c7a79;
  --accent: #c6c6c7;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Segoe UI", Roboto, sans-serif;
}

.layout {
  display: grid;
  grid-template-columns: 272px 1fr;
  min-height: 100vh;
}

.sidebar {
  border-right: 1px solid var(--line);
  background: rgba(16, 16, 16, 0.95);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.brand-title {
  margin: 0;
  color: var(--text);
  text-decoration: none;
  font-size: 28px;
  letter-spacing: 0.08em;
}

.brand-subtitle {
  margin: 6px 0 0;
  font-size: 11px;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

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

.nav-item {
  color: var(--muted);
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 2px;
  border: 1px solid transparent;
}

.nav-item-active,
.nav-item:hover {
  color: var(--text);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.sidebar-footer {
  margin-top: auto;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.sidebar-footer h2 {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--muted);
}

.main {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  height: 64px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: rgba(10, 10, 10, 0.85);
  position: sticky;
  top: 0;
  z-index: 2;
}

.topbar-actions {
  display: flex;
  gap: 8px;
}

.chat-scroll {
  position: relative;
  flex: 1;
  padding: 28px 64px 24px;
  overflow: auto;
}

.aid-bg {
  position: absolute;
  left: 64px;
  top: 60px;
  font-size: 260px;
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(172, 171, 170, 0.06);
  pointer-events: none;
  user-select: none;
}

.message {
  max-width: 860px;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}

.message-user {
  margin-left: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 18px;
  max-width: 640px;
}

.message-ai {
  background: transparent;
  border-left: 2px solid rgba(231, 229, 229, 0.18);
  padding-left: 18px;
}

.message-ai h2 {
  margin: 0 0 12px;
  font-size: 34px;
}

.message-ai p,
.message-user p {
  margin: 0 0 10px;
  color: var(--muted);
  line-height: 1.7;
  font-size: 18px;
}

.composer-wrap {
  border-top: 1px solid var(--line);
  padding: 16px 64px 28px;
  background: rgba(12, 12, 12, 0.96);
}

.model-switcher {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.pill {
  display: inline-block;
  background: #1f2020;
  border: 1px solid var(--line);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11px;
  padding: 6px 10px;
}

.model-pill {
  cursor: pointer;
}

.model-pill.active {
  color: #0f0f0f;
  background: var(--accent);
}

.composer {
  border: 1px solid var(--line);
  background: #0c0c0c;
  padding: 10px;
}

.composer textarea,
.composer input,
.field-group input {
  width: 100%;
  background: #101010;
  color: var(--text);
  border: 1px solid var(--line);
  padding: 10px;
  font-size: 14px;
}

.composer textarea {
  resize: vertical;
  min-height: 90px;
}

.composer-actions {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  margin-top: 10px;
}

.field-group {
  margin-bottom: 8px;
}

.field-group label {
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  color: var(--dim);
}

.btn {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
  padding: 10px 12px;
  cursor: pointer;
  text-decoration: none;
}

.btn:hover {
  background: rgba(255, 255, 255, 0.04);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #151515;
}

.btn-small {
  padding: 7px 10px;
  font-size: 13px;
}

.btn-wide {
  width: 100%;
}

.row-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 8px;
}

.hint {
  margin: 10px 0 0;
  color: rgba(172, 171, 170, 0.45);
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.15em;
  text-align: center;
}

.status {
  margin-top: 12px;
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 10px;
  max-height: 180px;
  overflow: auto;
}

.standalone .simple-header {
  height: 70px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.standalone .simple-header nav {
  display: flex;
  gap: 8px;
}

.page {
  padding: 40px 48px;
}

.page h1 {
  margin: 0;
  font-size: 36px;
}

.lead {
  color: var(--muted);
  margin-top: 8px;
}

.pricing-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.plan,
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 20px;
  position: relative;
}

.plan h2,
.card h2 {
  margin: 0 0 8px;
}

.price {
  font-size: 26px;
  margin: 0 0 14px;
}

.plan ul {
  margin: 0 0 14px;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.7;
}

.plan-popular {
  border-color: rgba(198, 198, 199, 0.5);
}

.popular {
  position: absolute;
  right: 14px;
  top: 14px;
  font-size: 11px;
  color: #111;
  background: var(--accent);
  padding: 4px 8px;
}

.billing-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .chat-scroll,
  .composer-wrap {
    padding-left: 18px;
    padding-right: 18px;
  }

  .aid-bg {
    left: 18px;
    font-size: 180px;
  }

  .pricing-grid,
  .billing-grid {
    grid-template-columns: 1fr;
  }
}