/* ── VARIABLES ────────────────────────────────────────────── */
:root {
  --bg:         #080810;
  --bg2:        #0e0e1c;
  --bg3:        #13132a;
  --border:     rgba(255,255,255,0.07);
  --text:       #e8e8f0;
  --muted:      #5a5a7a;
  --accent:     #7c6aff;
  --red:        #ff4757;
  --amber:      #ffa502;
  --green:      #2ed573;
  --font-head:  'Syne', sans-serif;
  --font-mono:  'DM Mono', monospace;
  --font-body:  'DM Sans', sans-serif;
  --radius:     14px;
  --glow-red:   0 0 30px rgba(255,71,87,0.15);
  --glow-green: 0 0 30px rgba(46,213,115,0.15);
  --glow-amber: 0 0 30px rgba(255,165,2,0.15);
}

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

html { scroll-behavior: smooth; }

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

/* ── BACKGROUND ───────────────────────────────────────────── */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(124,106,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,106,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(124,106,255,0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ── HEADER ───────────────────────────────────────────────── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background: rgba(8,8,16,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  color: var(--accent);
  font-size: 1.4rem;
  animation: spin 8s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.header-stats {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 40px;
  padding: 8px 20px;
}

.hstat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
}

.hstat-val {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  transition: all 0.3s;
}

.hstat-val.red   { color: var(--red); }
.hstat-val.amber { color: var(--amber); }
.hstat-val.green { color: var(--green); }

.hstat-lbl {
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hstat-divider {
  width: 1px;
  height: 28px;
  background: var(--border);
}

.api-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

/* ── MAIN LAYOUT ──────────────────────────────────────────── */
main {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 480px 1fr;
  gap: 0;
  min-height: calc(100vh - 65px);
}

/* ── FORM SECTION ─────────────────────────────────────────── */
.form-section {
  padding: 36px 32px;
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 28px;
  letter-spacing: -0.02em;
}

/* ── FORM GRID ────────────────────────────────────────────── */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

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

.form-group.span2 { grid-column: 1 / -1; }

label {
  font-size: 0.75rem;
  color: var(--muted);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.unit {
  color: #3a3a5a;
  font-size: 0.7rem;
}

input[type="number"],
.select-wrap select {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 14px;
  font-size: 0.9rem;
  font-family: var(--font-mono);
  outline: none;
  transition: border-color 0.2s, background 0.2s;
  appearance: none;
}

input[type="number"]:focus,
.select-wrap select:focus {
  border-color: var(--accent);
  background: rgba(124,106,255,0.05);
}

.select-wrap {
  position: relative;
}

.select-wrap::after {
  content: '▾';
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
  font-size: 0.8rem;
}

/* ── PREDICT BUTTON ───────────────────────────────────────── */
.predict-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 10px;
  padding: 14px 24px;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.02em;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}

.predict-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: opacity 0.2s;
}

.predict-btn:hover::before { opacity: 1; }
.predict-btn:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(124,106,255,0.3); }
.predict-btn:active { transform: translateY(0); }
.predict-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.btn-icon {
  font-size: 1.2rem;
  transition: transform 0.2s;
}

.predict-btn:hover .btn-icon { transform: translateX(4px); }

/* ── RESULT SECTION ───────────────────────────────────────── */
.result-section {
  padding: 36px 32px;
  overflow-y: auto;
}

/* ── PLACEHOLDER ──────────────────────────────────────────── */
.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 16px;
  color: var(--muted);
  text-align: center;
  line-height: 1.7;
}

.placeholder-icon {
  font-size: 3rem;
  color: #2a2a4a;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-10px); }
}

/* ── RESULTS INNER ────────────────────────────────────────── */
.results-inner {
  display: flex;
  flex-direction: column;
  gap: 28px;
  animation: fadeUp 0.4s ease;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── VERDICT ──────────────────────────────────────────────── */
.verdict-block {
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg2);
  transition: box-shadow 0.4s;
}

.verdict-block.churn  { box-shadow: var(--glow-red);   border-color: rgba(255,71,87,0.2); }
.verdict-block.stay   { box-shadow: var(--glow-green); border-color: rgba(46,213,115,0.2); }

.verdict-text {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 800;
  letter---spacing: -0.02em;
  margin: 8px 0 6px;
}

.verdict-text.churn { color: var(--red); }
.verdict-text.stay  { color: var(--green); }

.verdict-sub {
  font-size: 0.85rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

/* ── GAUGE ────────────────────────────────────────────────── */
.gauge-block {
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg2);
}

.gauge-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  margin-top: 12px;
}

.gauge-svg {
  width: 220px;
  height: 130px;
  overflow: visible;
}

.gauge-pct {
  font-family: var(--font-head);
  font-size: 2.2rem;
  font-weight: 800;
  margin-top: -20px;
  letter-spacing: -0.03em;
  transition: color 0.4s;
}

.gauge-labels {
  display: flex;
  justify-content: space-between;
  width: 200px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  margin-top: 8px;
}

.gauge-labels .green { color: var(--green); }
.gauge-labels .red   { color: var(--red); }

/* ── STAT CARDS ───────────────────────────────────────────── */
.stat-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.stat-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  text-align: center;
  transition: border-color 0.3s;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.stat-val {
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 700;
}

.risk-badge {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-mono);
}

.risk-High   { background: rgba(255,71,87,0.15);  color: var(--red);   border: 1px solid rgba(255,71,87,0.3); }
.risk-Medium { background: rgba(255,165,2,0.15);  color: var(--amber); border: 1px solid rgba(255,165,2,0.3); }
.risk-Low    { background: rgba(46,213,115,0.15); color: var(--green); border: 1px solid rgba(46,213,115,0.3); }

/* ── FEATURE IMPORTANCE ───────────────────────────────────── */
.feature-block {
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg2);
}

.feat-bars {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 14px;
}

.feat-row {
  display: grid;
  grid-template-columns: 160px 1fr 50px;
  align-items: center;
  gap: 12px;
  animation: fadeUp 0.4s ease both;
}

.feat-name {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.feat-track {
  height: 6px;
  background: var(--bg3);
  border-radius: 3px;
  overflow: hidden;
}

.feat-fill {
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent), #a78bfa);
  transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  width: 0%;
}

.feat-score {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  text-align: right;
}

/* ── STRATEGY BLOCK ───────────────────────────────────────── */
.strategy-block {
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg2);
}

.strategy-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 14px;
}

.strategy-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.5;
  animation: fadeUp 0.4s ease both;
}

.strategy-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  background: rgba(124,106,255,0.1);
  border-radius: 4px;
  padding: 2px 6px;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ── LOADING STATE ────────────────────────────────────────── */
.loading .btn-text { opacity: 0.5; }

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ── SCROLLBAR ────────────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #2a2a4a; border-radius: 2px; }

/* ── RESPONSIVE ───────────────────────────────────────────── */
@media (max-width: 900px) {
  main { grid-template-columns: 1fr; }
  .form-section { border-right: none; border-bottom: 1px solid var(--border); }
  header { padding: 12px 16px; }
  .header-stats { display: none; }
}