frontend/src/App.css

/* ── Layout ── */
.layout {
  display: flex;
  width: 100%;
  height: 100dvh;
  overflow: hidden;
  background: var(--bg-base);
  color: var(--text-primary);
  transition: background 0.2s, color 0.2s;
}

/* ── Sidebar ── */
.sidebar {
  width: 260px;
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 14px 16px;
  gap: 20px;
  overflow-y: auto;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 6px;
}

.logo-bolt {
  font-size: 20px;
  filter: sepia(1) saturate(5) hue-rotate(5deg) brightness(1.1);
}

.logo-text {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

/* ── New chat button ── */
.new-chat-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  transition: all 0.15s;
}

.new-chat-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Sidebar section ── */
.sidebar-section { flex: 1; }

.sidebar-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 0 6px;
}

/* ── Pipeline ── */
.pipeline {
  display: flex;
  flex-direction: column;
  padding: 0 2px;
}

.pipeline-item {
  display: flex;
  flex-direction: column;
}

.pipeline-step {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 6px;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
}

.pipeline-step:hover {
  background: var(--bg-card);
}

.step-icon {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-info {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.step-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.step-model {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pipeline-connector {
  width: 1px;
  height: 14px;
  background: var(--border-light);
  margin-left: 22px;
}

/* ── Dataset card ── */
.dataset-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.dataset-header {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
}

.dataset-name {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.dataset-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.dataset-tag {
  font-size: 11px;
  padding: 2px 8px;
  background: var(--bg-base);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
}

.dataset-source {
  font-size: 11px;
  color: var(--text-muted);
}

/* ── Sidebar footer ── */
.sidebar-footer {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0 4px;
}

.dark-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13px;
  transition: all 0.15s;
  width: 100%;
}

.dark-toggle:hover {
  border-color: var(--border-light);
  color: var(--text-primary);
}

.toggle-left {
  display: flex;
  align-items: center;
  gap: 7px;
}

.toggle-right {
  font-size: 11px;
  color: var(--text-muted);
}

.model-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
}

.model-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 6px #22c55e;
  flex-shrink: 0;
}

.sidebar-sub {
  font-size: 11px;
  color: var(--text-muted);
}

/* ── Main area ── */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.messages-area {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

/* ── Welcome ── */
.welcome {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  position: relative;
  overflow: hidden;
}

.welcome-glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(249,115,22,0.15) 0%, transparent 65%);
  pointer-events: none;
}

.welcome-bolt {
  font-size: 52px;
  margin-bottom: 18px;
  filter: sepia(1) saturate(5) hue-rotate(5deg) brightness(1.1);
  position: relative;
}

.welcome-title {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -1.5px;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.welcome-sub {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

.suggestions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 560px;
}

.suggestion {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: 14px;
  text-align: left;
  transition: all 0.15s;
}

.suggestion:hover {
  border-color: var(--accent);
  background: rgba(249, 115, 22, 0.06);
}

.suggestion-icon {
  color: var(--accent);
  flex-shrink: 0;
}

/* ── Messages ── */
.messages {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 780px;
  margin: 0 auto;
  padding: 28px 28px 8px;
  width: 100%;
}

.msg-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  animation: fadeUp 0.2s ease;
}

.msg-row--user { flex-direction: row-reverse; }

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

/* ── Avatars ── */
.avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}

.avatar--bot {
  background: linear-gradient(135deg, #f97316, #ea580c);
  color: #fff;
}

.avatar--user {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 10px;
}

/* ── Bubbles ── */
.bubble {
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 14px;
  line-height: 1.7;
  max-width: 620px;
  word-break: break-word;
}

.bubble--user {
  background: var(--user-bubble);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.bubble--assistant {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}

.bubble--error {
  border-color: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
}

/* ── Typing dots ── */
.typing-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-muted);
  margin: 0 2px;
  animation: bounce 1.2s infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.5; }
  40%           { transform: translateY(-5px); opacity: 1; }
}

/* ── Sources ── */
.assistant-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.confirm-actions { display: flex; gap: 8px; margin-top: 10px; }

.confirm-btn {
  padding: 6px 20px;
  border-radius: 6px;
  border: none;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}
.confirm-btn:hover { opacity: 0.85; }
.confirm-btn--yes { background: #059669; color: #fff; }
.confirm-btn--no  { background: #dc2626; color: #fff; }

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

.sources-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-muted);
}

.sources-list { display: flex; flex-wrap: wrap; gap: 6px; }

.source-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(249, 115, 22, 0.1);
  border: 1px solid rgba(249, 115, 22, 0.3);
  color: var(--accent-light);
  border-radius: var(--radius-full);
  padding: 3px 10px;
  font-size: 12px;
}

/* ── Input ── */
.input-wrapper {
  padding: 12px 28px 18px;
  max-width: 780px;
  margin: 0 auto;
  width: 100%;
}

.input-box {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  padding: 10px 10px 10px 20px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.input-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(249,115,22,0.12);
}

.input-textarea {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.6;
  max-height: 140px;
  overflow-y: auto;
}

.input-textarea::placeholder { color: var(--text-muted); }
.input-textarea:disabled { opacity: 0.5; }

.send-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.15s;
}

.send-btn--active {
  background: var(--accent);
  color: #fff;
}

.send-btn--active:hover { background: var(--accent-hover); }
.send-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.input-hint {
  text-align: center;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 8px;
}