:root {
  --bg-canvas: #0c111d;
  --bg-primary: #161b26;
  --bg-secondary: #1f242f;
  --bg-tertiary: #272d3b;
  --bg-hover: #2e3545;
  
  --border-primary: #333741;
  --border-secondary: #222631;
  --border-brand: #6366f1;

  --fg-primary: #f5f5f6;
  --fg-secondary: #94969c;
  --fg-muted: #667085;
  
  --brand-primary: #6366f1;
  --brand-hover: #4f46e5;
  --brand-muted: rgba(99, 102, 241, 0.15);

  --success: #12b76a;
  --success-bg: rgba(18, 183, 106, 0.15);
  --error: #f04438;
  --error-bg: rgba(240, 68, 56, 0.15);
  --warning: #f79009;
  --warning-bg: rgba(247, 144, 9, 0.15);

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

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

body {
  background-color: var(--bg-canvas);
  color: var(--fg-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  height: 100vh;
  overflow: hidden;
}

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

/* Header */
.top-nav {
  height: 56px;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex-shrink: 0;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 24px;
  height: 24px;
  color: var(--brand-primary);
}

.brand-title {
  font-weight: 600;
  font-size: 16px;
  color: var(--fg-primary);
}

.brand-subtitle {
  color: var(--brand-primary);
  font-weight: 500;
  margin-left: 4px;
}

.nav-status {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  user-select: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
}

.btn-xs {
  padding: 3px 8px;
  font-size: 11px;
}

.btn-primary {
  background-color: var(--brand-primary);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--brand-hover);
}

.btn-tertiary {
  background-color: transparent;
  border-color: var(--border-primary);
  color: var(--fg-primary);
}

.btn-tertiary:hover:not(:disabled) {
  background-color: var(--bg-secondary);
}

.btn-destructive {
  background-color: var(--error-bg);
  color: var(--error);
  border-color: rgba(240, 68, 56, 0.3);
}

.btn-destructive:hover:not(:disabled) {
  background-color: var(--error);
  color: #fff;
}

.btn-block {
  width: 100%;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
}

.badge-gray {
  background-color: var(--bg-tertiary);
  color: var(--fg-secondary);
}

.badge-success {
  background-color: var(--success-bg);
  color: var(--success);
}

.badge-error {
  background-color: var(--error-bg);
  color: var(--error);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: currentColor;
}

/* Main Layout */
.main-layout {
  display: grid;
  grid-template-columns: 280px 1fr 380px;
  flex: 1;
  overflow: hidden;
}

/* Left Column: Sessions */
.sessions-rail {
  background-color: var(--bg-primary);
  border-right: 1px solid var(--border-primary);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

.rail-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg-primary);
}

.sessions-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.session-card {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background-color: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: all 0.15s ease;
}

.session-card:hover {
  background-color: var(--bg-secondary);
}

.session-card.active {
  background-color: var(--bg-secondary);
  border-color: var(--brand-primary);
}

.session-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.session-card-title {
  font-weight: 600;
  font-size: 13px;
  color: var(--fg-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.session-card-sub {
  font-size: 11px;
  color: var(--fg-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-delete-session {
  opacity: 0;
  background: none;
  border: none;
  color: var(--fg-muted);
  cursor: pointer;
  padding: 2px;
}

.session-card:hover .btn-delete-session {
  opacity: 1;
}

.btn-delete-session:hover {
  color: var(--error);
}

/* Center Column: Chat */
.chat-section {
  background-color: var(--bg-canvas);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--border-primary);
}

.section-header {
  padding: 16px 20px;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.session-info h2 {
  font-size: 16px;
  font-weight: 600;
}

.session-meta {
  font-size: 12px;
  color: var(--fg-secondary);
  display: flex;
  gap: 8px;
  margin-top: 2px;
}

.chat-transcript {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  margin: auto;
  max-width: 420px;
  color: var(--fg-muted);
  padding: 40px 20px;
}

.empty-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background-color: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--brand-primary);
}

.empty-state h3 {
  color: var(--fg-primary);
  margin-bottom: 8px;
}

.empty-hint {
  font-size: 12px;
  color: var(--fg-muted);
  padding: 12px;
  text-align: center;
}

/* Chat Messages */
.message {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-width: 85%;
}

.message-user {
  align-self: flex-end;
}

.message-assistant {
  align-self: flex-start;
}

.message-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--fg-muted);
}

.message-user .message-header {
  justify-content: flex-end;
}

.message-body {
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  font-size: 13.5px;
  white-space: pre-wrap;
  word-break: break-word;
}

.message-user .message-body {
  background-color: var(--brand-primary);
  color: #fff;
  border-bottom-right-radius: 2px;
}

.message-assistant .message-body {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  color: var(--fg-primary);
  border-bottom-left-radius: 2px;
}

.message-tool-detail {
  font-family: var(--font-mono);
  font-size: 11px;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-primary);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--fg-secondary);
  margin-bottom: 8px;
}

.chat-input-container {
  padding: 16px 20px;
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-primary);
  flex-shrink: 0;
}

.chat-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

textarea#chatInput {
  width: 100%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--fg-primary);
  padding: 10px 14px;
  font-family: inherit;
  font-size: 13.5px;
  resize: none;
  outline: none;
  transition: border-color 0.15s ease;
}

textarea#chatInput:focus {
  border-color: var(--brand-primary);
}

.input-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* Right Column: Draft */
.draft-section {
  background-color: var(--bg-primary);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.draft-version {
  font-size: 11px;
  background-color: var(--bg-tertiary);
  color: var(--brand-primary);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
}

.draft-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

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

.form-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--fg-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.form-control {
  width: 100%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--fg-primary);
  padding: 8px 12px;
  font-family: inherit;
  font-size: 13px;
  outline: none;
}

.form-control:focus {
  border-color: var(--brand-primary);
}

textarea.form-control {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.45;
  resize: vertical;
}

/* Segmented Control */
.segmented-control {
  display: flex;
  background-color: var(--bg-canvas);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-primary);
}

.segment-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--fg-secondary);
  font-size: 12px;
  font-weight: 500;
  padding: 5px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.segment-btn.active {
  background-color: var(--brand-primary);
  color: #fff;
}

/* Agents Picker */
.agents-picker {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.agent-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
}

.agent-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
}

.agent-select-model {
  font-size: 11px;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-primary);
  color: var(--fg-primary);
  border-radius: var(--radius-sm);
  padding: 3px 6px;
  max-width: 140px;
}

/* Launches */
.launches-container {
  margin-top: 10px;
  border-top: 1px solid var(--border-primary);
  padding-top: 14px;
}

.launches-container h4 {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 10px;
}

.launches-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.launch-item {
  padding: 8px 10px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}

.launch-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.launch-agent {
  font-weight: 600;
}

.launch-status {
  font-size: 11px;
}

.launch-pr a {
  color: var(--brand-primary);
  text-decoration: none;
}

.launch-pr a:hover {
  text-decoration: underline;
}

.status-feedback {
  margin-top: 8px;
  font-size: 12px;
  min-height: 18px;
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(2px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal-overlay.open {
  display: flex;
}

.modal-content {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 520px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-close {
  background: none;
  border: none;
  color: var(--fg-muted);
  font-size: 20px;
  cursor: pointer;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.modal-desc {
  font-size: 13px;
  color: var(--fg-secondary);
}

.modal-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-primary);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.skills-picker-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  max-height: 120px;
  overflow-y: auto;
  padding: 6px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
}

.skill-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-primary);
  padding: 3px 8px;
  border-radius: var(--radius-full);
  cursor: pointer;
  user-select: none;
}

.skill-chip.selected {
  background-color: var(--brand-muted);
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

/* Responsive */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 240px 1fr;
  }
  .draft-section {
    display: none;
  }
}