:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --panel-2: #273449;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #818cf8;
  --gain: #34d399;
  --loss: #f87171;
  --border: #334155;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: linear-gradient(180deg, #0b1224 0%, #0f172a 100%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  min-height: 100vh;
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.lang-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-size: 0.85rem;
  color: var(--muted);
}

.lang-bar select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
}

.lang-bar select:focus {
  border-color: var(--accent);
}

header h1 {
  margin: 0 0 8px;
  font-size: 2rem;
  font-weight: 700;
}

.subtitle {
  margin: 0 0 28px;
  color: var(--muted);
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 24px;
}

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

.control label {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.input-row {
  display: flex;
  align-items: center;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
}

.input-row input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  width: 100%;
  min-width: 0;
}

.unit {
  color: var(--muted);
  font-size: 0.85rem;
  margin-left: 6px;
  white-space: nowrap;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 700;
}

.stat-value.gain { color: var(--gain); }

.chart-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 24px;
  height: 460px;
}

.milestones {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.milestone {
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  padding: 18px 20px;
}

.milestone:nth-child(2) { border-left-color: var(--accent-2); }

.milestone h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

.milestone-text {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.9rem;
}

.milestone-result {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--gain);
}

.milestone-result.unreached {
  color: var(--muted);
  font-weight: 500;
  font-size: 1rem;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 30px;
}

@media (max-width: 600px) {
  .chart-wrap { height: 340px; }
  header h1 { font-size: 1.5rem; }
  .stat-value { font-size: 1.3rem; }
}