:root {
  --c-data: #0369A1;
  --c-label: #7C3AED;
  --c-prep: #D97706;
  --c-model: #059669;
  --c-train: #DC2626;
  --c-eval: #DB2777;
  --c-deploy: #1E3932;
  --c-bg: #F1F5F9;
  --c-surface: #FFFFFF;
  --c-border: #E2E8F0;
  --c-text: #0F172A;
  --c-muted: #64748B;
  --c-success: #16A34A;
  --c-warn: #CA8A04;
  --c-error: #DC2626;
  --c-info: #0369A1;
  --topbar-h: 56px;
  --sidebar-w: 260px;
  --log-w: 320px;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(0, 0, 0, .08);
  --font: Inter, system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

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

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

button {
  font-family: var(--font);
  cursor: pointer;
  border: none;
  outline: none
}

input,
select {
  font-family: var(--font);
  outline: none
}

/* TOPBAR */
#topbar {
  height: var(--topbar-h);
  background: #0F172A;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  flex-shrink: 0;
  z-index: 100
}

#logo {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -.5px;
  white-space: nowrap
}

#logo span {
  color: #22D3EE
}

#flowbar {
  display: flex;
  align-items: center;
  gap: 0;
  flex: 1;
  justify-content: center;
  overflow: hidden
}

.flow-pill {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  color: #fff;
  opacity: .5;
  transition: .2s;
  cursor: default;
  white-space: nowrap
}

.flow-pill.active {
  opacity: 1
}

.flow-arrow {
  color: #475569;
  font-size: 12px
}

.flow-pill[data-phase="data"] {
  background: var(--c-data)
}

.flow-pill[data-phase="label"] {
  background: var(--c-label)
}

.flow-pill[data-phase="prep"] {
  background: var(--c-prep)
}

.flow-pill[data-phase="model"] {
  background: var(--c-model)
}

.flow-pill[data-phase="train"] {
  background: var(--c-train)
}

.flow-pill[data-phase="deploy"] {
  background: var(--c-deploy)
}

#topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0
}

.tb-btn {
  padding: 8px 14px;
  border-radius: 10px;
  border: 2px solid rgba(203, 213, 225, .25);
  font-size: 13px;
  font-weight: 600;
  background: #1E293B;
  color: #CBD5E1;
  transition: transform .12s, background .15s, color .15s;
  white-space: nowrap
}

.tb-btn:hover {
  background: #334155;
  color: #fff
}

.tb-btn:active {
  transform: scale(.95)
}

#btn-lang {
  font-size: 13px;
  padding: 8px 12px
}

#btn-run {
  background: #059669;
  color: #fff;
  padding: 8px 18px;
  border-radius: 10px;
  border: 3px solid #1a1a2e;
  box-shadow: 4px 4px 0 #1a1a2e;
  font-size: 13px;
  font-weight: 700;
  transition: transform .12s, box-shadow .12s, background .15s
}

#btn-run:hover {
  background: #047857
}

#btn-run:active {
  transform: scale(.95) translateY(2px);
  box-shadow: 2px 2px 0 #1a1a2e
}

/* WORKSPACE */
#workspace {
  display: flex;
  flex: 1;
  overflow: hidden
}

/* SIDEBAR */
#sidebar {
  width: var(--sidebar-w);
  background: #fff;
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex-shrink: 0
}

.sidebar-section {
  padding: 12px 14px
}

.sidebar-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--c-muted);
  text-transform: uppercase;
  letter-spacing: .08em;
  padding: 6px 2px 8px
}

.palette-block {
  background: #F8FAFC;
  border: 3px solid #1a1a2e;
  border-radius: 12px;
  box-shadow: 4px 4px 0 #1a1a2e;
  padding: 10px 12px;
  margin-bottom: 10px;
  cursor: grab;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  transition: transform .12s, box-shadow .12s;
  user-select: none;
  overflow: hidden
}

.palette-block span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap
}

.palette-block:hover {
  box-shadow: 2px 2px 0 #1a1a2e;
  transform: translate(2px, 2px)
}

.palette-block:active {
  cursor: grabbing
}

.block-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0
}

/* CANVAS */
#canvas {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--c-bg)
}

#canvas-inner {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, #CBD5E1 1px, transparent 1px);
  background-size: 24px 24px
}

#trash-zone {
  position: absolute;
  bottom: 16px;
  right: calc(var(--log-w) + 16px);
  width: 60px;
  height: 60px;
  border: 2px dashed #EF4444;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #EF4444;
  font-size: 22px;
  opacity: 0;
  transition: .2s;
  pointer-events: none;
  background: rgba(239, 68, 68, .05)
}

#trash-zone.visible {
  opacity: 1;
  pointer-events: all
}

#trash-zone.hot {
  background: rgba(239, 68, 68, .15);
  border-style: solid
}

/* BLOCK CARDS */
.block-card {
  position: absolute;
  width: 340px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 6px 6px 0 #1a1a2e;
  border: 3px solid #1a1a2e;
  user-select: none;
  min-height: 60px;
  transition: box-shadow .12s, transform .12s
}

.block-card.dragging {
  opacity: .85;
  box-shadow: 3px 3px 0 #1a1a2e;
  z-index: 1000
}

.block-card .bk-header {
  padding: 11px 14px;
  border-radius: 13px 13px 0 0;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: move;
  overflow: hidden
}

.block-card .bk-header .drag-handle {
  color: rgba(255, 255, 255, .5);
  font-size: 15px;
  line-height: 1;
  flex-shrink: 0
}

.block-card .bk-title {
  flex: 1;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  letter-spacing: .02em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap
}

.block-card .bk-badge {
  font-size: 10px;
  font-weight: 700;
  background: rgba(255, 255, 255, .25);
  color: #fff;
  padding: 3px 8px;
  border-radius: 12px;
  text-transform: uppercase;
  flex-shrink: 0;
  white-space: nowrap
}

.block-card .bk-status {
  font-size: 10px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 10px;
  background: rgba(255, 255, 255, .9);
  margin-left: auto;
  flex-shrink: 0;
  white-space: nowrap
}

.block-card.status-idle .bk-status {
  color: #64748B
}

.block-card.status-running .bk-status {
  color: #D97706;
  animation: pulse 1s infinite
}

.block-card.status-done .bk-status {
  color: #059669
}

.block-card.status-error .bk-status {
  color: #DC2626
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1
  }

  50% {
    opacity: .5
  }
}

.block-card .bk-body {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px
}

.block-card.collapsed .bk-body {
  display: none
}

.param-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px
}

.param-label {
  color: var(--c-muted);
  font-weight: 500;
  min-width: 90px;
  flex-shrink: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap
}

.param-row input[type=text],
.param-row select,
.param-row input[type=number] {
  flex: 1;
  min-width: 0;
  padding: 5px 8px;
  border: 1px solid var(--c-border);
  border-radius: 5px;
  font-size: 13px;
  background: #F8FAFC
}

.param-row input[type=range] {
  flex: 1
}

.bk-btn {
  padding: 7px 12px;
  border-radius: 10px;
  border: 3px solid #1a1a2e;
  box-shadow: 3px 3px 0 #1a1a2e;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  width: 100%;
  text-align: center;
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: transform .12s, box-shadow .12s
}

.bk-btn:active {
  transform: scale(.95) translateY(2px);
  box-shadow: 1px 1px 0 #1a1a2e
}

progress {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  border: none
}

progress::-webkit-progress-bar {
  background: #E2E8F0;
  border-radius: 3px
}

progress::-webkit-progress-value {
  border-radius: 3px;
  transition: width .3s
}

.thumb-strip {
  display: flex;
  gap: 4px;
  margin-top: 4px;
  flex-wrap: wrap
}

.thumb-strip canvas {
  width: 40px;
  height: 30px;
  border-radius: 4px;
  object-fit: cover;
  border: 1px solid var(--c-border)
}

.count-badge {
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 10px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  white-space: nowrap
}

video.bk-video {
  width: 100%;
  height: 180px;
  border-radius: 6px;
  object-fit: cover;
  display: block
}

canvas.bk-canvas {
  width: 100%;
  border-radius: 6px;
  display: block
}

.warn-banner {
  background: #FEF3C7;
  border: 1px solid #F59E0B;
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 12px;
  color: #B45309;
  display: none;
  word-wrap: break-word;
  overflow-wrap: break-word
}

.warn-banner.show {
  display: block
}

/* LOG PANEL */
#log-panel {
  width: var(--log-w);
  background: #0F172A;
  display: flex;
  flex-direction: column;
  flex-shrink: 0
}

#log-header {
  padding: 12px 14px;
  border-bottom: 1px solid #1E293B;
  display: flex;
  align-items: center;
  justify-content: space-between
}

#log-header-title {
  font-size: 13px;
  font-weight: 700;
  color: #94A3B8;
  text-transform: uppercase;
  letter-spacing: .08em
}

#log-clear {
  font-size: 10px;
  color: #475569;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--mono)
}

#log-entries {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 1px
}

.log-line {
  font-family: var(--mono);
  font-size: 12px;
  padding: 3px 5px;
  border-radius: 3px;
  line-height: 1.5;
  word-break: break-all
}

.log-line.ll-info {
  color: #64748B
}

.log-line.ll-success {
  color: #4ADE80
}

.log-line.ll-warn {
  color: #FCD34D
}

.log-line.ll-error {
  color: #F87171
}

.log-line.ll-step {
  color: #38BDF8;
  font-weight: 700
}

.log-line.ll-data {
  color: #93C5FD
}

#log-entries::-webkit-scrollbar {
  width: 4px
}

#log-entries::-webkit-scrollbar-track {
  background: transparent
}

#log-entries::-webkit-scrollbar-thumb {
  background: #1E293B;
  border-radius: 2px
}

/* MODAL */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .6);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px)
}

.modal-overlay.hidden {
  display: none
}

.modal-box {
  background: #fff;
  border-radius: 20px;
  border: 3px solid #1a1a2e;
  box-shadow: 8px 8px 0 #1a1a2e;
  padding: 32px;
  max-width: 560px;
  width: calc(100% - 32px);
  max-height: 90vh;
  overflow-y: auto
}

.modal-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px
}

.modal-subtitle {
  color: var(--c-muted);
  font-size: 14px;
  margin-bottom: 24px
}

.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 16px
}

.guide-step {
  display: flex;
  gap: 14px;
  align-items: flex-start
}

.guide-step-num {
  font-size: 11px;
  font-weight: 700;
  background: var(--c-deploy);
  color: #fff;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px
}

.guide-step-text h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 3px
}

.guide-step-text p {
  font-size: 13px;
  color: var(--c-muted);
  line-height: 1.5
}

.modal-footer {
  margin-top: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap
}

.modal-footer label {
  font-size: 12px;
  color: var(--c-muted);
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  margin-left: auto
}

.modal-close-btn {
  background: var(--c-deploy);
  color: #fff;
  padding: 10px 24px;
  border-radius: 12px;
  border: 3px solid #1a1a2e;
  box-shadow: 4px 4px 0 #1a1a2e;
  font-size: 14px;
  font-weight: 700;
  transition: transform .12s, box-shadow .12s, background .15s
}

.modal-close-btn:hover {
  background: #14532D
}

.modal-close-btn:active {
  transform: scale(.95) translateY(2px);
  box-shadow: 2px 2px 0 #1a1a2e
}

/* EDU MODE */
body.edu-mode .block-card {
  cursor: default
}

body.edu-mode .bk-header {
  cursor: default
}

.block-annotation {
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #1E3932;
  color: #fff;
  font-size: 11px;
  padding: 5px 10px;
  border-radius: 6px;
  white-space: nowrap;
  pointer-events: none;
  display: none;
  z-index: 50
}

body.edu-mode .block-annotation {
  display: block
}

/* Sparkline chart */
canvas.chart-canvas {
  width: 100%;
  height: 80px;
  border-radius: 6px;
  background: #F8FAFC;
  border: 1px solid var(--c-border)
}

/* Video overlay wrapper */
.video-wrap {
  position: relative;
  border-radius: 6px;
  overflow: hidden
}

.video-wrap canvas.overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%
}

/* Class rows */
.class-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--c-border)
}

.class-row:last-child {
  border-bottom: none
}

.class-color-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0
}

.class-name-input {
  flex: 1;
  min-width: 0;
  padding: 5px 8px;
  border: 1px solid var(--c-border);
  border-radius: 5px;
  font-size: 13px;
  font-weight: 600
}

.class-count {
  font-size: 12px;
  font-weight: 600;
  color: var(--c-muted);
  white-space: nowrap
}

.class-capture-btn {
  font-size: 12px;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 5px;
  color: #fff;
  flex-shrink: 0;
  white-space: nowrap
}

/* Responsive flow bar hiding on narrow */
@media(max-width:900px) {
  #flowbar {
    display: none
  }
}

/* Scrollbars */
#sidebar::-webkit-scrollbar {
  width: 4px
}

#sidebar::-webkit-scrollbar-thumb {
  background: var(--c-border);
  border-radius: 2px
}

/* Feature Maps */
.fmap-container {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  justify-content: center;
}

.fm-canvas {
  width: 32px;
  height: 32px;
  image-rendering: pixelated;
  border: 1px solid var(--c-border);
  border-radius: 4px;
}