:root {
  --bg: #0a0d14;
  --surface: #111520;
  --surface2: #161c2e;
  --border: rgba(255,255,255,0.07);
  --accent: #00d4ff;
  --accent2: #7c3aed;
  --danger: #ff4d6d;
  --warn: #fbbf24;
  --safe: #10b981;
  --text: #e2e8f0;
  --muted: #64748b;
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'DM Mono', monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─── Noise overlay ─── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* ─── Nav ─── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,13,20,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

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

.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  background: linear-gradient(90deg, #fff, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-sub {
  font-size: 0.7rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  background: rgba(16,185,129,0.1);
  border: 1px solid rgba(16,185,129,0.3);
  border-radius: 20px;
  padding: 5px 14px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--safe);
  font-weight: 500;
}

.status-dot {
  width: 7px; height: 7px;
  background: var(--safe);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

/* ─── Tabs ─── */
.tabs-wrapper {
  display: flex;
  gap: 0;
  padding: 28px 32px 0;
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 10px 22px;
  cursor: pointer;
  position: relative;
  transition: color 0.2s;
  letter-spacing: 0.01em;
}

.tab-btn::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.25s;
}

.tab-btn.active { color: #fff; }
.tab-btn.active::after { transform: scaleX(1); }
.tab-btn:hover { color: #fff; }

/* ─── Panels ─── */
.panel { display: none; padding: 36px 32px; animation: fadeIn 0.3s ease; }
.panel.active { display: block; }

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

/* ─── Section titles ─── */
.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 22px;
  background: linear-gradient(to bottom, var(--accent), var(--accent2));
  border-radius: 2px;
}

/* ─── Grid layouts ─── */
.predict-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 24px;
  align-items: start;
}

.form-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
}

.form-section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 14px;
  margin-top: 22px;
}

.form-section-label:first-child { margin-top: 0; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.form-row.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
.form-row.cols-1 { grid-template-columns: 1fr; }

.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

label {
  font-size: 0.75rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

input[type="number"], select {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.88rem;
  padding: 9px 12px;
  outline: none;
  transition: border-color 0.2s;
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
}

input[type="number"]:focus, select:focus {
  border-color: var(--accent);
}

select option { background: #1a1f30; }

/* Toggle row */
.toggle-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 12px;
}

.toggle-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.toggle-item label {
  font-size: 0.65rem;
  text-align: center;
  line-height: 1.3;
}

.switch {
  position: relative;
  width: 42px;
  height: 22px;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 22px;
  transition: 0.3s;
}

.slider::before {
  content: '';
  position: absolute;
  height: 14px; width: 14px;
  left: 3px; bottom: 3px;
  background: var(--muted);
  border-radius: 50%;
  transition: 0.3s;
}

.switch input:checked + .slider {
  background: rgba(0,212,255,0.15);
  border-color: var(--accent);
}

.switch input:checked + .slider::before {
  transform: translateX(20px);
  background: var(--accent);
}

/* Predict button */
.predict-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none;
  border-radius: 10px;
  color: #fff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 20px;
  transition: opacity 0.2s, transform 0.15s;
  letter-spacing: 0.03em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.predict-btn:hover { opacity: 0.9; transform: translateY(-1px); }
.predict-btn:active { transform: translateY(0); }
.predict-btn:disabled { cursor: wait; opacity: 0.75; }

.btn-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  display: none;
  animation: spin 0.8s linear infinite;
}

.predict-btn.loading .btn-spinner {
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ─── Result card ─── */
.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.result-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  gap: 12px;
  color: var(--muted);
  text-align: center;
}

.result-placeholder .icon { font-size: 3rem; opacity: 0.4; }
.result-placeholder p { font-size: 0.85rem; max-width: 200px; line-height: 1.5; }

.gauge-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.gauge-svg { width: 200px; height: 120px; }

.risk-label {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.8rem;
  text-align: center;
}

.risk-sublabel {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  text-align: center;
}

.risk-factors {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.risk-factor-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
}

.risk-factor-bar-wrap {
  flex: 1;
  margin: 0 10px;
  height: 4px;
  background: var(--surface2);
  border-radius: 4px;
  overflow: hidden;
}

.risk-factor-bar {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.verdict-box {
  border-radius: 14px;
  padding: 18px 16px;
  text-align: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
}

.verdict-churn {
  background: rgba(255,77,109,0.15);
  border: 2px solid rgba(255,77,109,0.6);
  color: var(--danger);
  box-shadow: 0 0 28px rgba(255,77,109,0.18);
}

.verdict-stay {
  background: rgba(16,185,129,0.15);
  border: 2px solid rgba(16,185,129,0.5);
  color: var(--safe);
  box-shadow: 0 0 28px rgba(16,185,129,0.14);
}

.verdict-sublabel {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.65;
  display: block;
  margin-bottom: 6px;
}

.verdict-main {
  font-size: 1.6rem;
  display: block;
  letter-spacing: 0.02em;
}

/* ─── Model Comparison ─── */
.model-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.model-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  position: relative;
  transition: border-color 0.2s;
}

.model-card.best {
  border-color: rgba(0,212,255,0.4);
}

.best-badge {
  position: absolute;
  top: -10px;
  right: 16px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 10px;
  padding: 3px 12px;
  font-size: 0.65rem;
  font-family: var(--font-mono);
  font-weight: 500;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.model-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 18px;
}

.model-name .model-emoji { margin-right: 6px; }

.metric-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.83rem;
}

.metric-row:last-child { border-bottom: none; }

.metric-name { color: var(--muted); }

.metric-val {
  font-family: var(--font-mono);
  font-weight: 500;
}

.metric-val.best-val { color: var(--accent); }

/* radar / comparison bar chart */
.compare-chart-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
}

.compare-chart-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 22px;
  color: var(--muted);
}

.compare-bar-group {
  margin-bottom: 18px;
}

.compare-bar-label {
  font-size: 0.78rem;
  color: var(--muted);
  font-family: var(--font-mono);
  margin-bottom: 6px;
}

.compare-bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.compare-bar-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
}

.model-tag {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
}

.tag-lr  { background: rgba(59,130,246,0.2);  color: #60a5fa; }
.tag-rf  { background: rgba(16,185,129,0.2); color: #34d399; }
.tag-gb  { background: rgba(251,146,60,0.2); color: #fb923c; }
.tag-xgb { background: rgba(251,191,36,0.2); color: #fbbf24; }

.cbar-outer {
  flex: 1;
  height: 8px;
  background: var(--surface2);
  border-radius: 4px;
  overflow: hidden;
}

.cbar-inner {
  height: 100%;
  border-radius: 4px;
  transition: width 1s cubic-bezier(0.22,1,0.36,1);
}

.cbar-lr  { background: #3b82f6; }
.cbar-rf  { background: #10b981; }
.cbar-gb  { background: linear-gradient(90deg, #fb923c, #f97316); }
.cbar-xgb { background: #fbbf24; }

.cbar-num {
  width: 40px;
  text-align: right;
  font-family: var(--font-mono);
  color: var(--muted);
  font-size: 0.73rem;
}

/* ─── Model Insights ─── */
.insights-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.insight-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
}

.insight-card.full { grid-column: 1 / -1; }

.feat-bar-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.feat-name {
  width: 160px;
  font-size: 0.78rem;
  flex-shrink: 0;
  color: var(--text);
  font-family: var(--font-mono);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.feat-bar-outer {
  flex: 1;
  height: 10px;
  background: var(--surface2);
  border-radius: 5px;
  overflow: hidden;
}

.feat-bar-inner {
  height: 100%;
  border-radius: 5px;
  transition: width 1.2s cubic-bezier(0.22,1,0.36,1);
}

.feat-pct {
  width: 40px;
  text-align: right;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--muted);
}

.new-feat-dot {
  display: inline-block;
  width: 6px; height: 6px;
  background: var(--accent2);
  border-radius: 50%;
  margin-left: 4px;
  vertical-align: middle;
}

/* Churn signal cards */
.signal-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.signal-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
}

.signal-rate {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.6rem;
  margin-bottom: 2px;
}

.signal-name {
  font-size: 0.75rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

.signal-desc {
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 4px;
  line-height: 1.4;
}

/* Confusion matrix */
.cm-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  max-width: 260px;
  margin: 16px auto 0;
}

.cm-cell {
  aspect-ratio: 1;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.cm-tp { background: rgba(16,185,129,0.2); border: 1px solid rgba(16,185,129,0.3); }
.cm-tn { background: rgba(59,130,246,0.15); border: 1px solid rgba(59,130,246,0.3); }
.cm-fp { background: rgba(251,191,36,0.12); border: 1px solid rgba(251,191,36,0.25); }
.cm-fn { background: rgba(255,77,109,0.15); border: 1px solid rgba(255,77,109,0.3); }

.cm-num { font-family: var(--font-display); font-weight: 700; font-size: 1.4rem; }
.cm-label { font-size: 0.65rem; color: var(--muted); font-family: var(--font-mono); text-align: center; }

/* Legend */
.legend-row {
  display: flex;
  gap: 16px;
  margin-top: 10px;
  justify-content: center;
  font-size: 0.72rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

.legend-dot {
  width: 8px; height: 8px;
  border-radius: 2px;
  display: inline-block;
  margin-right: 4px;
}