.chat-shell {
  display: grid;
  grid-template-columns: minmax(260px, 360px) minmax(0, 1fr);
  gap: 24px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 22px 84px;
}

.chat-sidebar,
.chat-workspace {
  min-width: 0;
}

.chat-brand-panel,
.allowance-panel,
.exchange-panel,
.chat-policy {
  border: 1px solid rgba(20, 28, 45, 0.12);
  border-radius: 8px;
  background: #ffffff;
  padding: 22px;
  box-shadow: 0 14px 32px rgba(20, 28, 45, 0.08);
}

.chat-sidebar {
  display: grid;
  align-content: start;
  gap: 16px;
}

.chat-brand-panel h1 {
  margin: 8px 0 12px;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.05;
}

.chat-brand-panel p,
.allowance-panel p,
.exchange-panel p,
.chat-policy p {
  color: #526070;
  line-height: 1.75;
}

.allowance-panel span {
  color: #526070;
  font-weight: 700;
}

.allowance-panel strong {
  display: block;
  margin: 10px 0;
  font-size: 2.3rem;
  color: #111827;
}

.exchange-panel h2,
.chat-policy h2 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.exchange-panel button,
.chat-composer button {
  border: 0;
  border-radius: 8px;
  background: #111827;
  color: #ffffff;
  font-weight: 800;
  padding: 12px 18px;
  cursor: pointer;
}

.chat-workspace {
  display: grid;
  grid-template-rows: auto minmax(360px, 1fr) auto;
  gap: 18px;
  min-height: 680px;
}

.chat-transcript {
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow: auto;
  min-height: 360px;
  border: 1px solid rgba(20, 28, 45, 0.12);
  border-radius: 8px;
  background: #f7f9fc;
  padding: 24px;
  scroll-padding: 24px;
}

.chat-message {
  max-width: min(720px, 92%);
  border-radius: 8px;
  padding: 14px 16px;
  line-height: 1.7;
}

.chat-message span {
  display: block;
  margin-bottom: 6px;
  font-size: 0.82rem;
  font-weight: 800;
  color: #526070;
}

.chat-message p {
  margin: 0;
  white-space: pre-wrap;
}

.chat-message small {
  display: block;
  margin-top: 8px;
  color: #64748b;
}

.chat-message.user {
  align-self: flex-end;
  background: #111827;
  color: #ffffff;
}

.chat-message.user span,
.chat-message.user small {
  color: rgba(255, 255, 255, 0.78);
}

.chat-message.assistant {
  align-self: flex-start;
  background: #ffffff;
  color: #111827;
  border: 1px solid rgba(20, 28, 45, 0.1);
}

.empty-chat {
  margin: auto;
  max-width: 560px;
  padding: 36px 20px;
  text-align: center;
  color: #526070;
}

.empty-chat h2 {
  color: #111827;
  margin: 0 0 12px;
  line-height: 1.25;
}

.empty-chat p {
  margin: 0;
  line-height: 1.8;
}

.chat-composer {
  position: relative;
  z-index: 1;
  border: 1px solid rgba(20, 28, 45, 0.12);
  border-radius: 8px;
  background: #ffffff;
  padding: 16px;
}

.chat-composer label[for="chat-message"] {
  display: block;
  margin-bottom: 8px;
  font-weight: 800;
}

.chat-composer textarea {
  width: 100%;
  box-sizing: border-box;
  resize: vertical;
  border: 1px solid rgba(20, 28, 45, 0.16);
  border-radius: 8px;
  padding: 14px;
  font: inherit;
}

.composer-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.file-picker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(20, 28, 45, 0.16);
  border-radius: 8px;
  padding: 10px 12px;
  font-weight: 800;
  cursor: pointer;
}

.file-picker span {
  font-size: 1.2rem;
}

.chat-composer input[type="file"] {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.composer-actions small {
  color: #64748b;
  line-height: 1.6;
}

.form-alert {
  border-radius: 8px;
  padding: 12px 14px;
  font-weight: 700;
}

.form-alert.error {
  background: #fff1f2;
  color: #be123c;
}

.form-alert.success {
  background: #ecfdf5;
  color: #047857;
}

@media (max-width: 860px) {
  .chat-shell {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 28px 16px 112px;
  }

  .chat-workspace {
    grid-template-rows: auto minmax(320px, auto) auto;
    gap: 16px;
    min-height: auto;
  }

  .chat-transcript {
    min-height: 320px;
    padding: 20px 16px;
  }

  .empty-chat {
    padding: 28px 10px;
  }

  .chat-message {
    max-width: 100%;
  }

  .composer-actions {
    align-items: stretch;
  }

  .composer-actions button,
  .file-picker {
    width: 100%;
    justify-content: center;
  }

  .composer-actions small {
    width: 100%;
  }
}