:root {
  color-scheme: light;
  --bg: #f3f7f4;
  --ink: #172126;
  --muted: #5d6b70;
  --surface: #ffffff;
  --surface-soft: #edf3ee;
  --line: #cbd7d0;
  --line-strong: #98aaa0;
  --green: #2c7a5a;
  --green-dark: #18543b;
  --blue: #315f93;
  --amber: #b66d1f;
  --red: #ad4e48;
  --shadow: 0 16px 38px rgba(23, 33, 38, 0.11);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 18% 0%, rgba(44, 122, 90, 0.14), transparent 32rem),
    linear-gradient(180deg, #f8fbf8 0, var(--bg) 34rem);
  color: var(--ink);
  font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
  line-height: 1.55;
}

button,
select,
input {
  font: inherit;
}

.site-header,
main,
footer {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: end;
  padding: 34px 0 22px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--green-dark);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1.18;
  letter-spacing: 0;
}

h1 {
  max-width: 820px;
  font-size: clamp(2rem, 4.8vw, 3.55rem);
}

h2 {
  font-size: clamp(1.18rem, 2vw, 1.5rem);
}

.lead {
  max-width: 780px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.hero-panel {
  display: grid;
  gap: 9px;
}

.hero-panel span {
  display: block;
  padding: 10px 12px;
  border-left: 4px solid var(--green);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
}

main {
  display: grid;
  gap: 20px;
  padding-bottom: 38px;
}

.decision-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.decision-strip article,
.standard-compare,
.controls,
.result-board,
.tables,
.final-conclusion {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.decision-strip article {
  padding: 16px;
}

.decision-strip strong {
  display: block;
  margin: 8px 0 6px;
  font-size: 1.05rem;
}

.decision-strip p,
.table-note {
  margin: 0;
  color: var(--muted);
}

.tag {
  display: inline-block;
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 0.82rem;
  font-weight: 700;
}

.tag.ok {
  color: #1c6041;
  background: rgba(44, 122, 90, 0.14);
}

.tag.warn {
  color: #794509;
  background: rgba(182, 109, 31, 0.16);
}

.tag.risk {
  color: #842d28;
  background: rgba(173, 78, 72, 0.15);
}

.standard-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
  color: var(--muted);
}

.standard-summary strong {
  color: var(--ink);
}

.standard-table-wrap {
  overflow-x: auto;
}

.standard-table {
  min-width: 760px;
}

.standard-table .tag {
  margin-left: 6px;
}

.standard-note {
  margin: 12px 0 0;
  color: var(--muted);
}

.simulator {
  display: grid;
  grid-template-columns: minmax(300px, 0.88fr) minmax(450px, 1.52fr);
  gap: 20px;
  align-items: start;
}

.controls,
.result-board,
.tables,
.standard-compare,
.final-conclusion {
  padding: 20px;
}

.section-title {
  margin-bottom: 16px;
}

.field {
  display: grid;
  gap: 8px;
  margin: 0 0 16px;
  border: 0;
  padding: 0;
}

.field span,
.field legend {
  color: var(--ink);
  font-weight: 700;
}

select {
  min-height: 42px;
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 0 12px;
  background: var(--surface);
  color: var(--ink);
}

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

.range-field small {
  color: var(--muted);
}

.segmented {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
}

.segmented.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.segmented button,
.tabs button {
  min-height: 40px;
  border: 0;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}

.segmented button + button {
  border-left: 1px solid var(--line-strong);
}

.segmented button.active,
.tabs button.active {
  background: var(--green);
  color: #fff;
  font-weight: 700;
}

.result-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.status {
  flex: 0 0 auto;
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(49, 95, 147, 0.14);
  color: var(--blue);
  font-weight: 700;
}

.status.ok {
  background: rgba(44, 122, 90, 0.14);
  color: #1c6041;
}

.status.warn {
  background: rgba(182, 109, 31, 0.16);
  color: #794509;
}

.status.risk {
  background: rgba(173, 78, 72, 0.15);
  color: #842d28;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.metric {
  min-height: 122px;
  padding: 14px;
  display: grid;
  align-content: space-between;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.metric span,
.verdict span {
  color: var(--muted);
  font-size: 0.88rem;
}

.metric strong,
.verdict strong {
  display: block;
  margin: 4px 0;
  font-size: clamp(1.3rem, 2.9vw, 2rem);
  line-height: 1;
}

#flowMetric {
  font-size: clamp(1.18rem, 2.25vw, 1.55rem);
  letter-spacing: 0;
  white-space: nowrap;
}

.metric small,
.verdict p {
  color: var(--muted);
}

.verdict {
  margin-top: 14px;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.verdict-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}

.bar {
  height: 12px;
  margin: 10px 0 12px;
  overflow: hidden;
  border-radius: 999px;
  background: #dce6df;
}

.bar i {
  display: block;
  width: 0;
  max-width: 130%;
  height: 100%;
  background: linear-gradient(90deg, var(--amber), var(--green));
  transition: width 180ms ease;
}

.verdict p {
  margin: 0;
}

.chart-wrap {
  min-height: 390px;
  margin-top: 16px;
}

#curveChart {
  display: block;
  width: 100%;
  min-height: 390px;
}

.grid-line {
  stroke: var(--line);
}

.axis-line {
  stroke: var(--line-strong);
}

.axis-text,
.chart-sub {
  fill: var(--muted);
  font-size: 12px;
}

.fan-line {
  fill: none;
  stroke: var(--green);
  stroke-width: 3;
}

.leak-line {
  fill: none;
  stroke: var(--amber);
  stroke-width: 3;
}

.target-line {
  stroke: var(--red);
  stroke-width: 2;
  stroke-dasharray: 7 7;
}

.work-point {
  fill: var(--green);
  stroke: var(--surface);
  stroke-width: 2;
}

.target-point {
  fill: var(--red);
}

.chart-label {
  fill: var(--ink);
  font-weight: 700;
  font-size: 13px;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.tabs button {
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 0 12px;
}

.table-panel {
  overflow-x: auto;
}

table {
  width: 100%;
  min-width: 820px;
  border-collapse: collapse;
  background: var(--surface);
}

th,
td {
  padding: 10px 11px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
}

th {
  background: #e7eee9;
  color: var(--ink);
  font-weight: 700;
}

td.numeric,
th.numeric {
  text-align: right;
  white-space: nowrap;
}

tbody tr:nth-child(even) td {
  background: #fbfcfb;
}

.table-note {
  margin-top: 10px;
  font-size: 0.92rem;
}

.conclusion-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(360px, 1.1fr);
  gap: 16px;
}

.conclusion-primary,
.conclusion-points article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.conclusion-primary {
  padding: 18px;
}

.conclusion-primary h3 {
  margin: 10px 0 10px;
  font-size: clamp(1.24rem, 2.2vw, 1.65rem);
  line-height: 1.3;
}

.conclusion-primary p,
.conclusion-points p {
  margin: 0;
  color: var(--muted);
}

.conclusion-points {
  display: grid;
  gap: 12px;
}

.conclusion-points article {
  padding: 15px;
}

.conclusion-points strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1.02rem;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 0 0 26px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 940px) {
  .site-header,
  .simulator {
    grid-template-columns: 1fr;
  }

  .decision-strip {
    grid-template-columns: 1fr;
  }

  .metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .conclusion-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .site-header,
  main,
  footer {
    width: min(100% - 20px, 1180px);
  }

  .controls,
  .result-board,
  .tables,
  .standard-compare,
  .final-conclusion {
    padding: 14px;
  }

  .result-head,
  footer {
    display: grid;
  }

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

  .conclusion-layout {
    grid-template-columns: 1fr;
  }

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

  .segmented button + button {
    border-left: 0;
    border-top: 1px solid var(--line-strong);
  }

  .chart-wrap,
  #curveChart {
    min-height: 330px;
  }

  table {
    min-width: 760px;
  }
}