/* gstack browse — Side Panel
 * Design system: DESIGN.md (Industrial/Utilitarian, amber accent, zinc neutrals)
 */

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  /* Brand — amber accent, rare and meaningful */
  --amber-400: #FBBF24;
  --amber-500: #F59E0B;
  --amber-600: #D97706;

  /* Neutrals — cool zinc */
  --zinc-50: #FAFAFA;
  --zinc-400: #A1A1AA;
  --zinc-600: #52525B;
  --zinc-800: #27272A;

  /* Surfaces */
  --bg-base: #0C0C0C;
  --bg-surface: #141414;
  --bg-hover: #1a1a1a;
  --border: #262626;
  --border-subtle: #1f1f1f;

  /* Text hierarchy */
  --text-heading: #FAFAFA;
  --text-body: #e0e0e0;
  --text-label: #A1A1AA;
  --text-meta: #52525B;
  --text-disabled: #3f3f46;

  /* Semantic */
  --success: #22C55E;
  --warning: #F59E0B;
  --error: #EF4444;
  --info: #3B82F6;

  /* Typography */
  --font-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
}

/* ─── Connection Banner ─────────────────────────────────────────── */

.conn-banner {
  padding: 6px 10px;
  font-size: 10px;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.conn-banner.reconnecting {
  background: rgba(245, 158, 11, 0.1);
  border-bottom: 1px solid rgba(245, 158, 11, 0.2);
  color: var(--amber-400);
}

.conn-banner.dead {
  background: rgba(239, 68, 68, 0.1);
  border-bottom: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--error);
}

.conn-banner.reconnected {
  background: rgba(34, 197, 94, 0.1);
  border-bottom: 1px solid rgba(34, 197, 94, 0.2);
  color: var(--success);
  animation: fadeOut 3s ease forwards;
  animation-delay: 2s;
}

@keyframes fadeOut {
  to { opacity: 0; height: 0; padding: 0; overflow: hidden; }
}

.conn-banner-text {
  flex: 1;
}

.conn-btn {
  font-size: 9px;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-label);
  transition: all 150ms;
}

.conn-btn:hover {
  background: var(--bg-hover);
  color: var(--text-heading);
}

.conn-copy {
  color: var(--text-meta);
  font-style: italic;
}

body {
  background: var(--bg-base);
  color: var(--text-body);
  font-family: var(--font-system);
  font-size: 12px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Grain texture overlay */
body::after {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ─── Status Dot ──────────────────────────────────────── */
.dot {
  width: 8px; height: 8px;
  border-radius: var(--radius-full);
  background: var(--text-disabled);
  flex-shrink: 0;
  transition: background 150ms;
}
.dot.connected { background: var(--success); }
.dot.reconnecting {
  background: var(--amber-500);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ─── Chat Messages ───────────────────────────────────── */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.chat-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  color: var(--text-meta);
  gap: 12px;
  font-size: 13px;
}
.chat-loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--amber-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.chat-welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  color: var(--text-label);
  gap: 8px;
  padding: 24px;
}
.chat-welcome-icon {
  width: 40px;
  height: 40px;
  background: var(--amber-500);
  color: #000;
  font-weight: 800;
  font-size: 22px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
}
.chat-welcome .muted { color: var(--text-meta); font-size: 12px; }

.chat-bubble {
  max-width: 90%;
  padding: 6px 10px;
  border-radius: var(--radius-lg);
  font-size: 11px;
  line-height: 1.4;
  word-break: break-word;
  animation: slideIn 150ms ease-out;
}
.chat-bubble.user {
  align-self: flex-end;
  background: var(--amber-500);
  color: #000;
  border-bottom-right-radius: var(--radius-sm);
}
.chat-bubble.assistant {
  align-self: flex-start;
  background: var(--bg-surface);
  color: var(--text-body);
  border: 1px solid var(--border);
  border-bottom-left-radius: var(--radius-sm);
}
.chat-bubble.assistant pre {
  background: var(--bg-base);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 8px;
  margin: 6px 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: pre-wrap;
}
.chat-bubble .chat-time, .agent-response > .chat-time {
  font-size: 9px;
  opacity: 0.4;
  margin-top: 2px;
  display: block;
}

/* ─── Agent Streaming Response ─────────────────────────── */
.agent-response {
  align-self: flex-start;
  max-width: 95%;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  border-bottom-left-radius: var(--radius-sm);
  padding: 6px 8px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  animation: slideIn 150ms ease-out;
}
.agent-tool {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px 6px;
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  font-size: 10px;
  font-family: var(--font-mono);
  overflow: hidden;
}
.tool-name {
  color: var(--amber-500);
  font-weight: 600;
  flex-shrink: 0;
}
.tool-input {
  color: var(--text-disabled);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.agent-text {
  color: var(--text-body);
  font-size: 11px;
  line-height: 1.4;
  word-break: break-word;
}
.agent-text pre {
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  padding: 4px 6px;
  margin: 4px 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  white-space: pre-wrap;
}
.agent-error {
  color: var(--error);
  font-size: 12px;
  font-family: var(--font-mono);
}

/* Thinking dots animation */
.agent-thinking {
  display: flex;
  gap: 4px;
  padding: 4px 0;
}
.thinking-dot {
  width: 4px;
  height: 4px;
  background: var(--text-disabled);
  border-radius: 50%;
  animation: thinkingPulse 1.4s ease-in-out infinite;
}
.thinking-dot:nth-child(2) { animation-delay: 0.2s; }
.thinking-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes thinkingPulse {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
  40% { opacity: 1; transform: scale(1); }
}

/* ─── Footer Buttons ──────────────────────────────────── */
.footer-left {
  display: flex;
  gap: 4px;
}
.footer-btn, .debug-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-meta);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  cursor: pointer;
  transition: all 150ms;
}
.footer-btn:hover, .debug-toggle:hover {
  color: var(--text-label);
  border-color: var(--zinc-600);
}
.debug-toggle.active {
  color: var(--amber-400);
  border-color: var(--amber-500);
}
.debug-tabs {
  border-top: 1px solid var(--border);
}
.close-debug {
  width: 36px;
  flex: none !important;
  font-size: 16px;
  color: var(--text-meta) !important;
}
.close-debug:hover { color: var(--text-label) !important; }

/* ─── Tab Bar ─────────────────────────────────────────── */
.tabs {
  height: 36px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-shrink: 0;
}
.tab {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-label);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 150ms;
}
.tab:hover:not(.disabled) { color: var(--zinc-50); }
.tab.active {
  color: var(--text-heading);
  border-bottom-color: var(--amber-500);
}
.tab.disabled {
  color: var(--text-disabled);
  cursor: not-allowed;
}

/* ─── Tab Content ─────────────────────────────────────── */
.tab-content {
  display: none;
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}
.tab-content.active { display: flex; flex-direction: column; }

/* ─── Activity Feed ───────────────────────────────────── */
#activity-feed { flex: 1; }

.activity-entry {
  padding: 8px 12px;
  border-left: 3px solid var(--border);
  border-bottom: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: background 150ms;
  animation: slideIn 150ms ease-out;
}
.activity-entry:hover { background: var(--bg-hover); }

@media (prefers-reduced-motion: reduce) {
  .activity-entry { animation: none; }
}

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

/* Left border colors by type */
.activity-entry.nav { border-left-color: var(--info); }
.activity-entry.interaction { border-left-color: var(--success); }
.activity-entry.observe { border-left-color: var(--amber-400); }
.activity-entry.error { border-left-color: var(--error); }
.activity-entry.pending {
  border-left-color: var(--amber-500);
  animation: slideIn 150ms ease-out, borderPulse 2s ease-in-out infinite;
}
@keyframes borderPulse {
  0%, 100% { border-left-color: rgba(245, 158, 11, 0.3); }
  50% { border-left-color: rgba(245, 158, 11, 1); }
}

.entry-header {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.entry-time {
  color: var(--text-meta);
  font-family: var(--font-mono);
  font-size: 11px;
  flex-shrink: 0;
}
.entry-command {
  color: var(--text-heading);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
}
.entry-args {
  color: var(--text-label);
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 2px;
}
.entry-status {
  font-size: 11px;
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.entry-status .ok { color: var(--success); }
.entry-status .err { color: var(--error); }
.entry-status .duration { color: var(--text-meta); }

/* Expanded state */
.entry-detail {
  display: none;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border);
}
.activity-entry.expanded .entry-detail { display: block; }
.activity-entry.expanded .entry-args { white-space: normal; }
.entry-result {
  color: var(--zinc-400);
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ─── Refs Tab ────────────────────────────────────────── */
.ref-row {
  height: 32px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 12px;
}
.ref-id {
  color: var(--amber-400);
  font-family: var(--font-mono);
  font-weight: 600;
  min-width: 32px;
}
.ref-role {
  color: var(--text-label);
  min-width: 60px;
}
.ref-name {
  color: var(--text-body);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.refs-footer {
  padding: 8px 12px;
  color: var(--text-meta);
  font-size: 11px;
  border-top: 1px solid var(--border);
}

/* ─── Session Placeholder ─────────────────────────────── */
.session-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  color: var(--text-label);
  padding: 24px;
  gap: 8px;
}
.session-placeholder .muted { color: var(--text-meta); font-size: 12px; }

/* ─── Empty State ─────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  text-align: center;
  color: var(--text-label);
  gap: 4px;
}
.empty-state .muted { color: var(--text-meta); font-size: 12px; }
.empty-state code {
  background: var(--bg-surface);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ─── Gap Banner ──────────────────────────────────────── */
.gap-banner {
  background: rgba(245, 158, 11, 0.08);
  border-bottom: 1px solid var(--amber-500);
  color: var(--amber-400);
  font-size: 11px;
  padding: 6px 12px;
  animation: bannerSlide 250ms ease-out;
}
@keyframes bannerSlide {
  from { transform: translateY(-100%); }
  to { transform: translateY(0); }
}

/* ─── Command Bar ─────────────────────────────────────── */
.command-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.command-prompt {
  color: var(--amber-500);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  user-select: none;
}
.command-input {
  flex: 1;
  background: var(--bg-base);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 6px 8px;
  color: var(--text-heading);
  font-family: var(--font-system);
  font-size: 11px;
  outline: none;
  transition: border-color 150ms;
}
.command-input:focus { border-color: var(--amber-500); }
.command-input::placeholder { color: var(--text-disabled); font-size: 10px; }
.command-input.sent {
  border-color: var(--success);
  transition: border-color 150ms;
}
.command-input.error {
  border-color: var(--error);
  animation: shake 300ms ease;
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}
.send-btn {
  width: 26px;
  height: 26px;
  background: var(--amber-500);
  border: none;
  border-radius: var(--radius-sm);
  color: #000;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 150ms;
  display: flex;
  align-items: center;
  justify-content: center;
}
.send-btn:hover { background: var(--amber-400); }
.send-btn:active { transform: scale(0.93); }
.send-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* ─── Footer ──────────────────────────────────────────── */
footer {
  height: 28px;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 8px;
  font-size: 10px;
  color: var(--text-meta);
  flex-shrink: 0;
}
#footer-url {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 50%;
}
.footer-right {
  display: flex;
  align-items: center;
  gap: 6px;
}
.footer-port {
  color: var(--text-meta);
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
  transition: color 150ms;
}
.footer-port:hover { color: var(--text-label); }
.port-input {
  width: 56px;
  padding: 2px 6px;
  background: var(--bg-base);
  border: 1px solid var(--zinc-600);
  border-radius: var(--radius-sm);
  color: var(--text-heading);
  font-family: var(--font-mono);
  font-size: 11px;
  outline: none;
  transition: border-color 150ms;
}
.port-input:focus { border-color: var(--amber-500); }

/* ─── Experimental Banner ─────────────────────────────── */
.experimental-banner {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #F59E0B;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  margin: 8px 12px;
  text-align: center;
  flex-shrink: 0;
}

/* ─── Accessibility ───────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 1px;
}