:root {
  --bg: #060816;
  --bg2: #0c1530;
  --bgGradientEnd: #1b1240;
  --card: rgba(255,255,255,0.05);
  --border: rgba(255,255,255,0.08);
  --text: #f5f7ff;
  --muted: #b3bdd7;
  --accent: #64d2ff;
  --accent2: #7b61ff;
  --success: #00d084;
  --warning: #ffab00;
  --error: #ff5252;
  --shadow: 0 12px 35px rgba(0,0,0,0.4);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background: linear-gradient(135deg, var(--bg) 0%, var(--bg2) 45%, var(--bgGradientEnd) 100%);
  color: var(--text);
  overflow-x: hidden;
  min-height: 100vh;
}

.bg-glow {
  position: fixed;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(100,210,255,0.14), transparent 70%);
  filter: blur(30px);
  z-index: -1;
}

.bg1 {
  top: -120px;
  left: -100px;
}

.bg2 {
  right: -120px;
  bottom: -120px;
}

header {
  position: sticky;
  top: 0;
  z-index: 999;
  backdrop-filter: blur(12px);
  background: rgba(7, 10, 22, 0.8);
  border-bottom: 1px solid var(--border);
}

.navbar {
  max-width: 1450px;
  margin: auto;
  padding: 18px 26px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 14px;
  font-weight: 800;
  font-size: 1.15rem;
}

.logo-icon {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: 900;
  box-shadow: var(--shadow);
}

.btn-back {
  padding: 10px 16px;
  border-radius: 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  transition: 0.25s ease;
  font-weight: 600;
}

.btn-back:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}

main {
  max-width: 1450px;
  margin: auto;
  padding: 40px 24px 80px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 32px;
  margin-bottom: 30px;
  box-shadow: var(--shadow);
}

.section-title {
  font-size: 2rem;
  margin-bottom: 24px;
}

.config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 30px;
}

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

.config-group.full-width {
  grid-column: 1 / -1;
}

.config-group label {
  font-weight: 700;
  color: var(--accent);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.input-select,
.input-number {
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  transition: 0.25s ease;
}

.input-select:focus,
.input-number:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(255,255,255,0.06);
}

.hint {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: -5px;
}

.slider-group {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.slider-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

.slider-value {
  font-weight: 700;
  color: var(--accent);
  font-size: 1.1rem;
}

.slider {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: rgba(255,255,255,0.1);
  outline: none;
  appearance: none;
}

.slider::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(100,210,255,0.4);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 8px rgba(100,210,255,0.4);
}

.split-warning {
  color: var(--warning);
  padding: 12px;
  border-radius: 12px;
  background: rgba(255,171,0,0.1);
  border: 1px solid rgba(255,171,0,0.3);
  text-align: center;
  font-weight: 600;
}

.button-group {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  padding: 14px 22px;
  border-radius: 14px;
  border: none;
  cursor: pointer;
  font-weight: 700;
  transition: 0.25s ease;
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: white;
}

.btn-secondary {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: white;
}

.btn:hover:not(:disabled) {
  transform: translateY(-2px);
}

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

/* Progress Steps */
.progress-steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  border-radius: 18px;
  background: rgba(255,255,255,0.03);
  border: 2px solid var(--border);
  transition: 0.3s ease;
  position: relative;
}

.step.running {
  border-color: var(--accent);
  background: rgba(100,210,255,0.05);
}

.step.completed {
  border-color: var(--success);
  background: rgba(0,208,132,0.05);
}

.step.error {
  border-color: var(--error);
  background: rgba(255,82,82,0.05);
}

.step-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
}

.step-content h4 {
  margin-bottom: 6px;
}

.step-content p {
  color: var(--muted);
  font-size: 0.9rem;
}

.step-indicator {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 0.3s ease;
}

.step.running .step-indicator {
  border-color: var(--accent);
  animation: pulse 1.5s ease-in-out infinite;
}

.step.completed .step-indicator {
  border-color: var(--success);
  background: var(--success);
}

.step.completed .step-indicator::after {
  content: '✓';
  color: white;
  font-size: 14px;
  font-weight: bold;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.metric-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  text-align: center;
  transition: 0.25s ease;
}

.metric-card:hover {
  background: rgba(255,255,255,0.06);
  transform: translateY(-4px);
}

.metric-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.metric-value {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #b498ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}

.metric-label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
}

/* Plotly Customization */
#confusion-plot,
#umap-plot,
#feature-plot {
  min-height: 500px;
  border-radius: 18px;
  overflow: hidden;
}

footer {
  margin-top: 70px;
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 30px;
  color: var(--muted);
}

@media (max-width: 768px) {
  .section-title {
    font-size: 1.5rem;
  }

  .config-grid {
    grid-template-columns: 1fr;
  }

  .navbar {
    justify-content: center;
  }
}