app/static/styles.css

:root {
  --bg: #f7faf7;
  --sidebar: #eef7ef;
  --panel: #ffffff;
  --panel-soft: #f4fbf5;
  --line: #d9e8dc;
  --line-strong: #bdd8c2;
  --text: #173123;
  --muted: #63816b;
  --green-950: #14351f;
  --green-900: #1f4a2b;
  --green-800: #256b38;
  --green-700: #2d8243;
  --green-500: #46b15f;
  --green-200: #dbeede;
  --shadow: 0 10px 30px rgba(20, 53, 31, 0.06);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
}

.app-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  height: 100vh;
  overflow: hidden;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 18px 14px;
  background: var(--sidebar);
  border-right: 1px solid var(--line);
  min-height: 0;
  overflow: hidden;
}

.sidebar-top {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 10px;
}

.brand-mark,
.empty-logo {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--green-900), var(--green-700));
  color: white;
  font-weight: 700;
}

.brand-title {
  font-size: 0.96rem;
  font-weight: 700;
}

.brand-subtitle {
  font-size: 0.83rem;
  color: var(--muted);
}

.sidebar-action {
  width: 100%;
}

.sidebar-section,
.sidebar-footer {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.68);
}

.sidebar-section.fill {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.sidebar-label,
.workspace-badge,
.message-role,
.status-pill,
.composer-meta {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.sidebar-footer {
  margin-top: auto;
}

.sidebar-footer p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.user-id-card {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 10px;
  margin-bottom: 12px;
}

.user-id {
  flex: 1;
  padding: 11px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: white;
  font-size: 0.9rem;
  font-weight: 600;
  overflow-wrap: anywhere;
}

.text-input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: white;
  color: var(--text);
  padding: 13px 14px;
  font: inherit;
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.text-input:focus,
textarea:focus {
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(70, 177, 95, 0.14);
}

.composer textarea:focus {
  box-shadow: none;
}

.primary-button,
.secondary-button,
.icon-button,
.prompt-chip,
.send-button {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 12px 14px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 160ms ease, transform 160ms ease, border-color 160ms ease;
}

.primary-button:hover,
.secondary-button:hover,
.icon-button:hover,
.prompt-chip:hover,
.send-button:hover {
  transform: translateY(-1px);
}

.primary-button {
  color: white;
  background: linear-gradient(135deg, var(--green-800), var(--green-700));
}

.secondary-button,
.icon-button,
.prompt-chip {
  color: var(--green-900);
  background: white;
  border-color: var(--line);
}

.icon-button {
  white-space: nowrap;
}

.memory-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
  overflow: auto;
}

.memory-item {
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: white;
  color: var(--text);
}

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

.workspace {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  height: 100vh;
  min-height: 0;
  overflow: hidden;
  background: white;
}

.workspace-header {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  position: sticky;
  top: 0;
  z-index: 5;
}

.workspace-heading h1 {
  margin: 6px 0 4px;
  font-size: 1.35rem;
}

.workspace-heading p {
  margin: 0;
  color: var(--muted);
}

.conversation-shell {
  min-height: 0;
  height: 100%;
  overflow-y: auto;
  overflow-x: hidden;
  scroll-behavior: smooth;
  background:
    linear-gradient(180deg, rgba(244, 251, 245, 0.55), rgba(255, 255, 255, 0));
}

.status-pill {
  padding: 9px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
  white-space: nowrap;
}

.messages {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 120px;
}

.empty-state {
  display: grid;
  gap: 14px;
  justify-items: center;
  text-align: center;
  padding: 72px 0 32px;
}

.empty-state h2 {
  margin: 0;
  font-size: 2rem;
  font-weight: 600;
}

.empty-state p {
  margin: 0;
  max-width: 620px;
  color: var(--muted);
}

.prompt-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  width: min(760px, 100%);
  margin-top: 10px;
}

.prompt-chip {
  text-align: left;
  padding: 16px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.message-row {
  padding: 20px 0;
  border-bottom: 1px solid rgba(217, 232, 220, 0.72);
  animation: fadeUp 260ms ease;
}

.message-row.user {
  background: linear-gradient(90deg, rgba(244, 251, 245, 0), rgba(244, 251, 245, 0.95), rgba(244, 251, 245, 0));
}

.message-inner {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.message-role {
  margin-bottom: 8px;
  font-weight: 700;
}

.message-avatar {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  font-size: 0.9rem;
  font-weight: 700;
  color: white;
  background: linear-gradient(135deg, var(--green-900), var(--green-700));
  box-shadow: var(--shadow);
}

.message-row.user .message-avatar {
  order: 2;
  background: linear-gradient(135deg, #88cb96, #4da964);
}

.message-bubble {
  padding: 2px 0 0;
  line-height: 1.6;
  white-space: pre-wrap;
  font-size: 1rem;
}

.message-row.user .message-inner {
  grid-template-columns: minmax(0, 1fr) 42px;
}

.message-row.user .message-content {
  order: 1;
  display: grid;
  justify-items: end;
}

.message-row.user .message-role {
  text-align: right;
}

.message-row.user .message-bubble {
  width: fit-content;
  max-width: min(82%, 720px);
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: white;
  box-shadow: var(--shadow);
}

.composer-wrap {
  padding: 18px 24px 24px;
  border-top: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.7), #ffffff 32%);
  position: sticky;
  bottom: 0;
  z-index: 5;
}

.composer {
  width: min(860px, 100%);
  margin: 0 auto;
}

.composer-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: end;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: white;
  box-shadow: var(--shadow);
}

.composer textarea {
  min-height: 28px;
  max-height: 220px;
  padding: 10px 12px;
  border: none;
  box-shadow: none;
  resize: none;
}

.send-button {
  width: 46px;
  height: 46px;
  padding: 0;
  border-radius: 14px;
  color: white;
  background: linear-gradient(135deg, var(--green-900), var(--green-700));
  font-size: 1.2rem;
  line-height: 1;
}

.send-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.composer-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 4px 0;
}

.message-content {
  min-width: 0;
}

.hidden,
.sr-only {
  display: none;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1080px) {
  .app-shell {
    grid-template-columns: 1fr;
    height: 100vh;
  }

  .sidebar {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-content: start;
    max-height: none;
    overflow: auto;
  }
}

@media (max-width: 720px) {
  .app-shell {
    height: 100vh;
  }

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

  .workspace-header,
  .composer-wrap {
    padding-inline: 16px;
  }

  .workspace-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .messages,
  .message-inner,
  .composer {
    width: calc(100% - 20px);
  }

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

  .composer-box,
  .composer-meta {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: stretch;
  }

  .composer-meta {
    gap: 8px;
  }

  .send-button {
    justify-self: end;
  }
}