src/styles.css

:root {
  color: #182233;
  background: #eef2f6;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  min-height: 40px;
  padding: 0 15px;
  border: 0;
  border-radius: 6px;
  background: #176b6c;
  color: #fff;
  font-weight: 750;
  cursor: pointer;
}

button:disabled {
  cursor: wait;
  opacity: 0.6;
}

#app {
  min-height: 100vh;
  padding: 14px;
}

.app-shell {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 12px;
  width: min(1360px, 100%);
  min-height: calc(100vh - 28px);
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0 14px;
  border-bottom: 1px solid #c7d2df;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 34px;
  line-height: 1;
  letter-spacing: 0;
}

h2 {
  font-size: 15px;
  line-height: 1.2;
  color: #3f5064;
}

#model-label {
  margin-top: 7px;
  color: #5d6c7f;
  overflow-wrap: anywhere;
}

.status-stack {
  display: flex;
  flex-wrap: wrap;
  justify-content: end;
  gap: 8px;
  max-width: 680px;
}

.status {
  min-height: 34px;
  max-width: 260px;
  padding: 7px 10px;
  border: 1px solid #b7c4d3;
  border-radius: 6px;
  background: #fff;
  color: #314155;
  overflow-wrap: anywhere;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 12px;
  min-height: 0;
}

.chat-panel,
.side-panel {
  min-height: 0;
}

.chat-panel {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  gap: 12px;
}

.chat-scroll {
  min-height: 420px;
  max-height: calc(100vh - 214px);
  overflow: auto;
  padding: 18px;
  border: 1px solid #c1ccda;
  border-radius: 8px;
  background: #fbfcfe;
}

.empty-chat {
  display: grid;
  align-content: center;
  gap: 10px;
  min-height: 320px;
  color: #4c5d72;
  text-align: center;
}

.empty-chat h2 {
  font-size: 24px;
  color: #182233;
}

.message {
  display: grid;
  gap: 7px;
  width: min(760px, 92%);
  margin-bottom: 14px;
  padding: 12px 14px;
  border: 1px solid #c4ceda;
  border-radius: 8px;
  background: #fff;
}

.message.user {
  margin-left: auto;
  border-color: #99bfbd;
  background: #e9f7f4;
}

.message.assistant {
  border-color: #c4ceda;
}

.message.tool {
  width: min(820px, 96%);
  margin-left: 24px;
  background: #f5f7fa;
}

.message.error {
  border-color: #d99a9a;
  background: #fff4f4;
}

.message-label {
  color: #5e6e82;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.message-body {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  line-height: 1.48;
}

.message-code,
pre {
  margin: 0;
  white-space: pre-wrap;
  overflow: auto;
  overflow-wrap: anywhere;
  line-height: 1.45;
}

.message-code {
  max-height: 240px;
  padding: 10px;
  border-radius: 6px;
  background: #182233;
  color: #e9eef5;
}

.tool-call {
  display: grid;
  gap: 6px;
  padding: 10px;
  border: 1px solid #d1dae5;
  border-radius: 6px;
  background: #f7f9fc;
}

.tool-name {
  color: #315f63;
  font-weight: 800;
}

.tool-call code {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.composer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: end;
  padding: 10px;
  border: 1px solid #c1ccda;
  border-radius: 8px;
  background: #fff;
}

textarea {
  width: 100%;
  min-height: 64px;
  max-height: 180px;
  resize: vertical;
  padding: 12px;
  border: 1px solid #b8c5d4;
  border-radius: 6px;
  background: #fff;
  color: #152033;
  line-height: 1.45;
}

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

#demo-prompt {
  background: #4f5f73;
}

.side-panel {
  display: grid;
  align-content: start;
  gap: 12px;
}

.control-group {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid #c1ccda;
  border-radius: 8px;
  background: #fff;
}

label {
  display: grid;
  gap: 6px;
  color: #526173;
  font-size: 13px;
  font-weight: 700;
}

select,
input {
  width: 100%;
  height: 40px;
  padding: 0 10px;
  border: 1px solid #b8c5d4;
  border-radius: 6px;
  background: #fff;
  color: #152033;
}

.compact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

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

#reset-sandbox,
#use-test-model {
  background: #4f5f73;
}

#files,
#event-log {
  min-height: 150px;
  max-height: 230px;
  padding: 10px;
  border: 1px solid #d1dae5;
  border-radius: 6px;
  background: #f7f9fc;
  color: #243248;
}

#event-log {
  max-height: 270px;
}

.model-gate {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(20, 31, 45, 0.46);
  z-index: 20;
}

.model-gate.hidden {
  display: none;
}

.model-dialog {
  display: grid;
  gap: 16px;
  width: min(540px, 100%);
  padding: 22px;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 24px 80px rgba(17, 27, 42, 0.22);
}

.eyebrow {
  margin-bottom: 7px;
  color: #176b6c;
  font-size: 12px;
  font-weight: 850;
  text-transform: uppercase;
}

.model-dialog h2 {
  font-size: 24px;
  color: #172033;
}

.dialog-copy {
  margin-top: 8px;
  color: #526173;
  line-height: 1.5;
}

.dialog-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.dialog-options {
  display: grid;
  gap: 10px;
  color: #526173;
}

#gate-status {
  min-height: 22px;
  overflow-wrap: anywhere;
}

@media (max-width: 900px) {
  #app {
    padding: 10px;
  }

  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .status-stack {
    justify-content: start;
  }

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

  .chat-scroll {
    min-height: 360px;
    max-height: none;
  }

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

  .composer-actions {
    justify-content: end;
  }
}