frontend/src/styles.css

:root {
  color-scheme: light dark;
  --bg: #0e0f13;
  --bg-muted: #16181f;
  --panel: #1d2029;
  --text: #f6f4f0;
  --text-muted: #b9becb;
  --accent: #f68b1f;
  --accent-soft: rgba(246, 139, 31, 0.18);
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 30px 60px rgba(0, 0, 0, 0.35);
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: "Space Grotesk", "Segoe UI", sans-serif;
}

:root[data-theme="light"] {
  --bg: #f6f3ee;
  --bg-muted: #efe8de;
  --panel: #ffffff;
  --text: #1b1a19;
  --text-muted: #5f5b56;
  --accent: #db3a2f;
  --accent-soft: rgba(219, 58, 47, 0.15);
  --border: rgba(0, 0, 0, 0.1);
  --shadow: 0 30px 60px rgba(12, 12, 12, 0.15);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--sans);
  background: radial-gradient(circle at top left, rgba(246, 139, 31, 0.12), transparent 55%),
    radial-gradient(circle at 20% 20%, rgba(115, 143, 255, 0.15), transparent 45%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 40px;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent), #f7c975);
  box-shadow: 0 12px 30px rgba(246, 139, 31, 0.35);
}

.brand-title {
  font-weight: 600;
  letter-spacing: 0.04em;
}

.brand-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.topbar-actions {
  display: flex;
  gap: 12px;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  padding: 28px 40px 40px;
  flex: 1;
}

.chat {
  background: var(--panel);
  border-radius: 28px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-height: 70vh;
  border: 1px solid var(--border);
}

.chat-header {
  padding: 28px 28px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.chat-title {
  font-size: 1.2rem;
  font-weight: 600;
}

.chat-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.dot,
.pulse {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
}

.pulse {
  position: relative;
}

.pulse::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  animation: pulse 1.6s ease-in-out infinite;
}

@keyframes pulse {
  0% {
    transform: scale(0.6);
    opacity: 0.6;
  }
  100% {
    transform: scale(1.6);
    opacity: 0;
  }
}

.chat-body {
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  overflow-y: auto;
  flex: 1;
}

.empty {
  padding: 40px 0 20px;
}

.empty h2 {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.empty p {
  color: var(--text-muted);
  max-width: 520px;
}

.shortcut-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.shortcut-card {
  background: var(--bg-muted);
  padding: 14px;
  border-radius: 16px;
  border: 1px solid var(--border);
}

.shortcut-combo {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
}

.shortcut-action {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.message-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.message-group.user {
  align-items: flex-end;
}

.message-group.assistant {
  align-items: flex-start;
}

.message-meta {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.message-stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.message-bubble {
  padding: 14px 18px;
  border-radius: 18px;
  max-width: 520px;
  line-height: 1.5;
  background: var(--bg-muted);
  border: 1px solid var(--border);
}

.message-group.user .message-bubble {
  background: linear-gradient(135deg, var(--accent), #f4b36c);
  color: #1b1a19;
  border: none;
}

.typing {
  display: flex;
  gap: 6px;
  align-items: center;
  padding-left: 8px;
}

.typing span {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: bounce 1.2s infinite ease-in-out;
}

.typing span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes bounce {
  0%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-6px);
  }
}

.chat-input {
  border-top: 1px solid var(--border);
  padding: 18px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-input textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  font-family: var(--sans);
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
  resize: none;
  min-height: 74px;
}

.input-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.input-hint {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

button {
  font-family: var(--sans);
  border: none;
  border-radius: 12px;
  padding: 10px 18px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

button.primary {
  background: var(--accent);
  color: #121212;
  font-weight: 600;
  box-shadow: 0 14px 30px rgba(246, 139, 31, 0.3);
}

button.primary:hover:not(:disabled) {
  transform: translateY(-1px);
}

button.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

button.ghost.full {
  width: 100%;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.card {
  background: var(--panel);
  border-radius: 24px;
  padding: 20px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.card h3 {
  margin-top: 0;
}

.card p {
  color: var(--text-muted);
}

.metric {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
  font-size: 0.9rem;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.badge-row span {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-muted);
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: -1;
  }
}

@media (max-width: 720px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .layout {
    padding: 20px;
  }

  .chat {
    border-radius: 20px;
  }
}