:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1e3a8a;
  --color-primary-light: #e0e7ff;
  --color-primary-bg: #f0f4fe;
  --color-accent-blue: #3b82f6;
  --color-red: #dc2626;
  --color-green: #16a34a;
  --color-amber: #f59e0b;
  --color-text-heading: #1e2b3c;
  --color-text-body: #2c3e50;
  --color-text-muted: #5a6e85;
  --color-text-info: #1e293b;
  --color-bg: #f5f7fa;
  --color-bg-white: #fff;
  --color-bg-subtle: #f8fafc;
  --color-bg-info: #f1f5f9;
  --color-border: #e9edf2;
  --color-border-chart: #eef2f6;
  --color-slider-bg: #d1d9e6;
  --color-mark-line: #888;
  --radius-main: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-main: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-thumb: 0 2px 6px rgba(37, 99, 235, 0.3);
}

* {
  box-sizing: border-box;
  font-family: "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

body {
  background: var(--color-bg);
  margin: 0;
  padding: 20px;
  display: flex;
  justify-content: center;
}

.container {
  max-width: 1400px;
  width: 100%;
  background: var(--color-bg-white);
  border-radius: var(--radius-main);
  box-shadow: var(--shadow-main);
  padding: 24px 28px 32px;
}

h1 {
  font-size: 24px;
  margin: 0 0 6px 0;
  color: var(--color-text-heading);
  font-weight: 600;
  letter-spacing: 0.3px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.subtitle {
  color: var(--color-text-muted);
  font-size: 14px;
  margin: 0 0 20px 0;
  border-left: 3px solid var(--color-accent-blue);
  padding-left: 14px;
  background: var(--color-primary-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.5;
}

/* ---- Parameter panel ---- */
.param-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 14px 20px;
  background: var(--color-bg-subtle);
  padding: 18px 20px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
  border: 1px solid var(--color-border);
}

.param-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.param-item label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-body);
  display: flex;
  justify-content: space-between;
}

.param-item label .value {
  color: var(--color-primary-dark);
  font-weight: 600;
  background: var(--color-primary-light);
  padding: 0 8px;
  border-radius: 4px;
  font-size: 12px;
}

.param-item input[type="range"] {
  width: 100%;
  margin: 2px 0;
  cursor: pointer;
  accent-color: var(--color-primary);
  height: 5px;
  background: var(--color-slider-bg);
  border-radius: 4px;
}

.param-item input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  background: var(--color-primary);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-thumb);
}

.param-item input[type="number"] {
  width: 100%;
  margin: 2px 0;
  padding: 6px 8px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 14px;
  color: var(--color-text-body);
  background: var(--color-bg-white);
  outline: none;
}

.param-item input[type="number"]:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

/* ---- Charts ---- */
.chart-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 8px;
}

.chart-box {
  flex: 1 1 calc(50% - 10px);
  min-width: 340px;
  height: 420px;
  background: var(--color-bg-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-chart);
  padding: 8px 6px 0 6px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
  transition: box-shadow 0.2s;
}

.chart-box:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

/* ---- Info bar ---- */
.info-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 36px;
  margin: 12px 0 0 0;
  padding: 12px 16px;
  background: var(--color-bg-info);
  border-radius: 10px;
  font-size: 14px;
  color: var(--color-text-info);
  align-items: center;
}

.info-bar span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.info-bar .badge {
  font-weight: 600;
  color: #0f172a;
}

.info-bar .highlight {
  color: var(--color-primary);
  font-weight: 700;
}

.info-bar .red {
  color: var(--color-red);
}

.info-bar .green {
  color: var(--color-green);
}

.info-bar .auto-margin {
  margin-left: auto;
  font-size: 13px;
  color: #64748b;
}

/* ---- Scenario section ---- */
.scenario-section {
  margin-top: 32px;
}

.scenario-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.scenario-section h2 {
  font-size: 20px;
  margin: 0 0 4px 0;
  color: var(--color-text-heading);
}

.scenario-desc {
  color: var(--color-text-muted);
  font-size: 13px;
  margin: 0 0 12px 0;
}

.refresh-btn {
  flex-shrink: 0;
  border: none;
  background: var(--color-primary);
  color: #fff;
  font-size: 14px;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: var(--shadow-thumb);
  transition: background 0.2s;
}

.refresh-btn:hover {
  background: var(--color-primary-dark);
}

/* ---- Responsive ---- */
@media (max-width: 700px) {
  .param-grid {
    grid-template-columns: 1fr 1fr;
  }
  .chart-box {
    flex: 1 1 100%;
    height: 340px;
  }
  .container {
    padding: 16px;
  }
}

@media (max-width: 480px) {
  .param-grid {
    grid-template-columns: 1fr;
  }
}