:root {
  --bg: #f4f6f7;
  --panel: #ffffff;
  --text: #1d252b;
  --muted: #5d6972;
  --line: #d7dee2;
  --accent: #0f6b68;
  --accent-dark: #0b4e4c;
  --risk-high: #b8443d;
  --risk-low: #247a52;
  --amber: #b37a18;
  --shadow: 0 16px 36px rgba(29, 37, 43, 0.10);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
  line-height: 1.5;
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.9fr);
  gap: 24px;
  align-items: start;
}

.calculator-panel,
.result-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.calculator-panel {
  padding: 28px;
}

.result-panel {
  padding: 22px;
  position: sticky;
  top: 20px;
}

.title-block {
  border-bottom: 1px solid var(--line);
  padding-bottom: 20px;
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.25;
  letter-spacing: 0;
}

.subtitle {
  max-width: 760px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.field {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  min-width: 0;
}

.field-wide {
  grid-column: 1 / -1;
}

label,
legend {
  display: block;
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

input[type="number"] {
  width: 100%;
  border: 1px solid #aeb9bf;
  border-radius: 6px;
  padding: 11px 12px;
  font-size: 16px;
  color: var(--text);
  background: #fff;
}

input[type="number"]:focus {
  outline: 3px solid rgba(15, 107, 104, 0.18);
  border-color: var(--accent);
}

.hint {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.segmented label {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  margin: 0;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  background: #fafbfb;
}

.segmented input {
  margin-right: 7px;
  accent-color: var(--accent);
}

.segmented label:has(input:checked) {
  border-color: var(--accent);
  color: var(--accent-dark);
  background: #e7f2f1;
}

.actions {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 4px;
}

button {
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 11px 16px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}

.primary {
  color: #fff;
  background: var(--accent);
}

.primary:hover {
  background: var(--accent-dark);
}

.secondary {
  color: var(--accent-dark);
  background: #e7f2f1;
  border-color: #b8d4d2;
}

.ghost {
  color: var(--muted);
  background: #fff;
  border-color: var(--line);
}

.result-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  background: #fbfcfc;
}

.result-card.high {
  border-color: rgba(184, 68, 61, 0.45);
  background: #fff6f5;
}

.result-card.low {
  border-color: rgba(36, 122, 82, 0.45);
  background: #f3fbf6;
}

.result-label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.risk-percent {
  margin: 0;
  font-size: 38px;
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: 0;
}

.risk-group {
  min-height: 28px;
  margin: 10px 0 16px;
  font-size: 18px;
  font-weight: 700;
}

.meter {
  position: relative;
  height: 12px;
  border-radius: 999px;
  background: #dfe5e7;
  overflow: hidden;
}

.meter-fill {
  width: 0%;
  height: 100%;
  background: var(--amber);
  transition: width 180ms ease;
}

.cutoff-marker {
  position: absolute;
  left: 58.4%;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--text);
}

.risk-detail {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.details-block {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.details-block h2 {
  margin: 0 0 8px;
  font-size: 16px;
  letter-spacing: 0;
}

.details-block p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.formula {
  color: var(--text) !important;
  font-family: Consolas, "Courier New", monospace;
  font-size: 13px !important;
}

.compact {
  padding-bottom: 2px;
}

@media (max-width: 880px) {
  .app-shell {
    grid-template-columns: 1fr;
    width: min(100% - 20px, 720px);
    padding: 18px 0;
  }

  .result-panel {
    position: static;
  }
}

@media (max-width: 640px) {
  .calculator-panel,
  .result-panel {
    padding: 18px;
  }

  h1 {
    font-size: 22px;
  }

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

  .risk-percent {
    font-size: 32px;
  }
}