/* ==========================================================================
   BMW M MOTORSPORT ENGINEERING DESIGN SYSTEM - RESEARCH AGENT UI
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,300;0,400;0,600;0,700;0,800;1,300&family=Outfit:wght@500;700;800;900&family=Fira+Code:wght@400;500&display=swap');

:root {
  /* Colors */
  --canvas: #000000;
  --surface-card: #1a1a1a;
  --surface-soft: #0d0d0d;
  --surface-elevated: #262626;
  --hairline: #3c3c3c;
  --hairline-strong: #262626;

  --primary: #ffffff;
  --body: #bbbbbb;
  --body-strong: #e6e6e6;
  --muted: #7e7e7e;

  /* Iconic M Tricolor */
  --m-blue-light: #0066b1;
  --m-blue-dark: #1c69d4;
  --m-red: #e22718;
  --m-tricolor-gradient: linear-gradient(90deg, #0066b1 0%, #0066b1 33.33%, #1c69d4 33.33%, #1c69d4 66.66%, #e22718 66.66%, #e22718 100%);

  /* Typography */
  --font-display: 'Outfit', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-code: 'Fira Code', monospace;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--canvas);
  color: var(--primary);
  height: 100vh;
  overflow: hidden;
  display: flex;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 4px;
  height: 4px;
}
::-webkit-scrollbar-track {
  background: var(--canvas);
}
::-webkit-scrollbar-thumb {
  background: var(--hairline);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--body);
}

/* App Container */
#app-container {
  display: flex;
  width: 100vw;
  height: 100vh;
  background: var(--canvas);
}

/* M Tricolor Divider Bar */
.m-stripe-divider {
  height: 4px;
  width: 100%;
  background: var(--m-tricolor-gradient);
}

/* Sidebar Styling */
#sidebar {
  width: 320px;
  background: var(--canvas);
  border-right: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1.25rem;
  gap: 1.25rem;
  z-index: 10;
  overflow-y: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-badge {
  display: flex;
  height: 20px;
  width: 36px;
  background: var(--m-tricolor-gradient);
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 900;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--primary);
}

/* Buttons - 0px Radius Industrial Silhouette */
.btn-m-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--primary);
  color: #000000;
  border: 1px solid var(--primary);
  padding: 0.85rem 1.25rem;
  border-radius: 0px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.82rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-m-primary:hover {
  background: transparent;
  color: var(--primary);
}

.btn-m-outline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--hairline);
  padding: 0.85rem 1.25rem;
  border-radius: 0px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.82rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-m-outline:hover {
  border-color: var(--primary);
  background: var(--surface-card);
}

/* Section Labels */
.section-label {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.section-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.25rem;
}

.section-label-row .section-label {
  margin-bottom: 0;
}

.btn-add-source {
  background: rgba(0, 102, 177, 0.15);
  color: #FFFFFF;
  border: 1px solid #0066b1;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.65rem;
  letter-spacing: 0.8px;
  padding: 3px 8px;
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  border-radius: 0px;
  transition: all 0.2s ease;
}

.btn-add-source:hover {
  background: #0066b1;
  color: #FFFFFF;
}

.sources-card-grid {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  min-height: 120px;
  max-height: 240px;
  overflow-y: auto;
  padding-right: 2px;
}

.source-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  padding: 0.5rem 0.65rem;
  border-radius: 0px;
  transition: all 0.2s ease;
}

.source-card:hover {
  border-color: #0066b1;
  background: rgba(26, 26, 26, 0.9);
}

.source-card-main {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow: hidden;
  flex: 1;
}

.source-badge {
  font-family: var(--font-display);
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 1px 5px;
  border: 1px solid var(--hairline);
  flex-shrink: 0;
}

.source-title {
  font-size: 0.76rem;
  color: #E6E6E6;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-delete-source {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 0 4px;
  opacity: 0.5;
  transition: opacity 0.2s ease, color 0.2s ease;
}

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

.btn-delete-source:hover {
  color: #E22718;
}

.empty-sources-notice {
  font-size: 0.68rem;
  color: var(--muted);
  padding: 0.75rem 0.5rem;
  text-transform: uppercase;
  text-align: center;
  border: 1px dashed var(--hairline);
}

.drop-zone-mini {
  background: rgba(13, 13, 13, 0.8);
  border: 1px dashed var(--hairline);
  padding: 0.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.drop-zone-mini:hover, .drop-zone-mini.dragover {
  border-color: #0066b1;
  background: rgba(0, 102, 177, 0.1);
}

/* Sessions List */
.sessions-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
  overflow-y: auto;
}

.session-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.9rem;
  background: var(--surface-soft);
  border: 1px solid var(--hairline);
  border-radius: 0px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-size: 0.85rem;
  color: var(--body);
}

.session-item:hover, .session-item.active {
  background: var(--surface-card);
  border-color: var(--primary);
  color: var(--primary);
}

.btn-del-session {
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
}

.btn-del-session:hover {
  color: var(--m-red);
}

/* Drop Zone */
.drop-zone {
  border: 1px dashed var(--hairline);
  background: var(--surface-soft);
  border-radius: 0px;
  padding: 1.25rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--primary);
  background: var(--surface-card);
}

.drop-icon {
  font-size: 1.4rem;
  margin-bottom: 0.25rem;
  color: var(--primary);
}

.drop-text {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--primary);
}

.drop-subtext {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

/* Agent Execution Trace Telemetry Visualizer */
.trace-accordion {
  margin-bottom: 0.75rem;
  border: 1px solid var(--hairline);
  background: rgba(13, 13, 13, 0.9);
}

.trace-toggle-btn {
  width: 100%;
  background: rgba(0, 102, 177, 0.15);
  border: none;
  border-bottom: 1px solid var(--hairline);
  color: #FFFFFF;
  padding: 0.45rem 0.75rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.68rem;
  letter-spacing: 1px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: background 0.2s ease;
}

.trace-toggle-btn:hover {
  background: rgba(0, 102, 177, 0.3);
}

.trace-chevron {
  transition: transform 0.2s ease;
  font-size: 0.6rem;
  color: var(--muted);
}

.trace-accordion.open .trace-chevron {
  transform: rotate(180deg);
}

.trace-body {
  display: none;
  padding: 0.6rem;
  flex-direction: column;
  gap: 0.5rem;
}

.trace-accordion.open .trace-body {
  display: flex;
}

.trace-detail-card {
  background: #141414;
  border: 1px solid var(--hairline);
  padding: 0.5rem 0.65rem;
}

.pulse-dot {
  display: inline-block;
  color: var(--m-red);
  font-size: 0.7rem;
  margin-right: 4px;
  animation: pulseDot 1.2s infinite ease-in-out;
}

@keyframes pulseDot {
  0% { opacity: 0.3; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.2); }
  100% { opacity: 0.3; transform: scale(0.8); }
}

/* Main Content Workspace */
#main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: var(--canvas);
}

/* Top Bar Header */
#top-bar {
  padding: 1rem 2rem;
  background: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--primary);
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--m-blue-light);
  box-shadow: 0 0 6px var(--m-blue-light);
}

.model-pill {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  padding: 0.35rem 0.75rem;
  border-radius: 0px;
}

.agents-pill-button {
  cursor: pointer;
  border-color: rgba(0, 102, 177, 0.6);
  background: rgba(0, 102, 177, 0.12);
  display: flex;
  align-items: center;
  gap: 6px;
  position: relative;
  user-select: none;
  transition: all 0.2s ease;
}

.agents-pill-button:hover {
  border-color: #0066b1;
  background: rgba(0, 102, 177, 0.25);
}

.agents-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 270px;
  background: #0d0d0d;
  border: 1px solid var(--hairline);
  border-top: 2px solid #0066b1;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  padding: 0.75rem;
  z-index: 100;
  flex-direction: column;
  gap: 0.6rem;
}

.agents-dropdown.active {
  display: flex;
}

.dropdown-header {
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--muted);
  text-transform: uppercase;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--hairline);
}

.agent-dropdown-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 0.3rem 0;
}

.agent-dot {
  font-size: 0.7rem;
  margin-top: 2px;
}

.agent-name {
  font-size: 0.78rem;
  font-weight: 700;
  color: #FFFFFF;
}

.agent-sub {
  font-size: 0.66rem;
  color: var(--muted);
}

/* Chat Feed */
#chat-feed {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Empty State Greeting */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  gap: 1rem;
}

.empty-headline {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 900;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary);
  line-height: 1.1;
}

.empty-subtext {
  font-weight: 300;
  color: var(--body);
  max-width: 550px;
  font-size: 0.95rem;
}

.prompt-suggestions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  max-width: 800px;
  width: 100%;
  margin-top: 1.5rem;
}

.suggestion-card {
  background: var(--surface-soft);
  border: 1px solid var(--hairline);
  padding: 1.25rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
}

.suggestion-card:hover {
  background: var(--surface-card);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.suggestion-tag {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--m-blue-dark);
  margin-bottom: 0.4rem;
}

.suggestion-title {
  font-size: 0.88rem;
  color: var(--body-strong);
  line-height: 1.4;
}

/* Message Rows */
.msg-row {
  display: flex;
  gap: 1rem;
  max-width: 85%;
}

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

.avatar {
  width: 38px;
  height: 38px;
  border-radius: 0px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 1px;
  flex-shrink: 0;
}

.msg-row.user .avatar {
  background: var(--surface-elevated);
  border: 1px solid var(--hairline);
  color: var(--primary);
}

.msg-row.agent .avatar {
  background: var(--m-tricolor-gradient);
  color: #ffffff;
}

.bubble {
  padding: 1.25rem 1.5rem;
  border-radius: 0px;
  font-size: 0.95rem;
  font-weight: 300;
  line-height: 1.6;
  position: relative;
  word-break: break-word;
}

.msg-row.user .bubble {
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  color: var(--primary);
}

.msg-row.agent .bubble {
  background: var(--surface-soft);
  border: 1px solid var(--hairline);
  color: var(--body-strong);
}

/* Input Area Container */
#input-container {
  padding: 1.5rem 2rem 2rem 2rem;
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
}

.input-box {
  display: flex;
  align-items: center;
  background: var(--surface-card);
  border: 1px solid var(--hairline);
  border-radius: 0px;
  padding: 0.5rem 0.75rem 0.5rem 1.25rem;
  transition: all 0.2s ease;
}

.input-box:focus-within {
  border-color: var(--primary);
}

textarea#prompt-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--primary);
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.95rem;
  resize: none;
  max-height: 120px;
  height: 24px;
}

.btn-send {
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #000000;
  border: none;
  border-radius: 0px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.btn-send:hover {
  background: var(--m-blue-dark);
  color: #ffffff;
}