:root {
  --bg: #0b0d12;
  --panel: #11141b;
  --panel-2: #171b24;
  --panel-3: #1d222d;
  --line: #262c38;
  --text: #f6f7fb;
  --muted: #9ba4b6;
  --soft: #c7ceda;
  --accent: #8d9cff;
  --accent-2: #b58cff;
  --danger: #ff9a9a;
  --sidebar: 272px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}

button,
textarea,
select {
  font: inherit;
}

button,
select {
  cursor: pointer;
}

.shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--sidebar) 1fr;
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar);
  display: flex;
  flex-direction: column;
  padding: 20px 16px;
  background: var(--panel);
  border-right: 1px solid var(--line);
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 2px 8px 22px;
}

.brand-mark,
.welcome-mark {
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  font-weight: 800;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 11px;
}

.brand strong,
.brand span {
  display: block;
}

.brand strong {
  font-size: 15px;
}

.brand span {
  margin-top: 1px;
  color: var(--muted);
  font-size: 12px;
}

.new-chat {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-2);
  color: var(--text);
  padding: 11px 13px;
  text-align: left;
}

.new-chat:hover {
  background: var(--panel-3);
}

.new-chat span {
  margin-right: 8px;
}

.sidebar-label {
  margin: 28px 8px 10px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.model-note {
  padding: 10px 8px;
  border-radius: 10px;
}

.model-note strong,
.model-note span {
  display: block;
}

.model-note strong {
  font-size: 13px;
  color: var(--soft);
}

.model-note span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.45;
}

.sidebar-footer {
  margin-top: auto;
  padding: 16px 8px 2px;
  color: #727b8c;
  font-size: 10px;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.main {
  grid-column: 2;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 10px 24px;
  background: rgba(11, 13, 18, .92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(38, 44, 56, .7);
}

.menu-button {
  display: none;
  border: 0;
  background: transparent;
  color: var(--text);
  font-size: 21px;
}

.model-control {
  display: flex;
  align-items: center;
  gap: 9px;
}

.model-control label {
  color: var(--muted);
  font-size: 12px;
}

.model-control select {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  background: var(--panel-2);
  color: var(--text);
  outline: none;
}

.status {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: #6fe7a6;
  box-shadow: 0 0 14px rgba(111, 231, 166, .55);
}

.conversation {
  width: min(860px, calc(100% - 40px));
  margin: 0 auto;
  flex: 1;
  padding: 42px 0 190px;
}

.welcome {
  max-width: 680px;
  margin: 9vh auto 0;
  text-align: center;
}

.welcome-mark {
  width: 54px;
  height: 54px;
  margin: 0 auto 18px;
  border-radius: 17px;
  font-size: 22px;
}

.welcome h1 {
  margin: 0;
  font-size: clamp(30px, 5vw, 44px);
  letter-spacing: -.04em;
}

.welcome p {
  max-width: 580px;
  margin: 14px auto 26px;
  color: var(--muted);
  line-height: 1.65;
}

.suggestions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.suggestions button {
  min-height: 88px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--panel);
  color: var(--soft);
  padding: 14px;
  text-align: left;
  line-height: 1.4;
}

.suggestions button:hover {
  background: var(--panel-2);
}

.message {
  margin: 0 0 26px;
}

.message.user {
  display: flex;
  justify-content: flex-end;
}

.message.user .bubble {
  max-width: min(76%, 650px);
  padding: 12px 16px;
  border-radius: 18px 18px 5px 18px;
  background: var(--panel-3);
  color: var(--text);
}

.message.assistant .bubble {
  max-width: 760px;
  color: var(--soft);
  line-height: 1.72;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.message-label {
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.message.error .bubble {
  color: var(--danger);
}

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

.composer-wrap {
  position: fixed;
  right: 0;
  bottom: 0;
  left: var(--sidebar);
  z-index: 12;
  padding: 20px 20px 12px;
  background:
    linear-gradient(
      to top,
      var(--bg) 72%,
      rgba(11, 13, 18, 0)
    );
}

.composer {
  width: min(860px, 100%);
  margin: 0 auto;
  padding: 12px 13px 10px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-2);
  box-shadow: 0 16px 50px rgba(0, 0, 0, .28);
}

.composer textarea {
  width: 100%;
  max-height: 180px;
  resize: none;
  border: 0;
  outline: none;
  padding: 5px 4px 10px;
  background: transparent;
  color: var(--text);
  line-height: 1.55;
}

.composer textarea::placeholder {
  color: #747e90;
}

.composer-bottom {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hint {
  color: #747e90;
  font-size: 10px;
}

.send-button {
  margin-left: auto;
  border: 0;
  border-radius: 10px;
  padding: 8px 14px;
  background: var(--text);
  color: #11141b;
  font-weight: 700;
}

.send-button:disabled {
  opacity: .45;
  cursor: default;
}

.disclaimer {
  width: min(860px, 100%);
  margin: 8px auto 0;
  color: #697285;
  text-align: center;
  font-size: 10px;
}

@media (max-width: 760px) {
  :root {
    --sidebar: 250px;
  }

  .shell {
    display: block;
  }

  .sidebar {
    transform: translateX(-100%);
    transition: transform .2s ease;
    box-shadow: 20px 0 70px rgba(0, 0, 0, .35);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main {
    min-height: 100vh;
  }

  .menu-button {
    display: block;
  }

  .topbar {
    padding: 10px 14px;
  }

  .conversation {
    width: min(100% - 28px, 860px);
    padding-top: 28px;
  }

  .welcome {
    margin-top: 4vh;
  }

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

  .composer-wrap {
    left: 0;
    padding: 18px 12px 10px;
  }

  .message.user .bubble {
    max-width: 88%;
  }
}