:root {
  color-scheme: light;
  --navy: #082f4d;
  --blue: #0d668b;
  --cyan: #2d9ba9;
  --orange: #ef7b35;
  --green: #23845d;
  --red: #b13d32;
  --ink: #172936;
  --muted: #647684;
  --line: #d5e2e8;
  --paper: #f2f7f8;
  --white: #fff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 92% 3%, rgba(45, 155, 169, .15), transparent 24rem),
    var(--paper);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

button,
input,
select { font: inherit; }

.calc-page {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto;
  padding: 38px 0 44px;
}

.calc-hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
  align-items: center;
  padding: 38px;
  border-radius: 20px;
  background: linear-gradient(130deg, #072c49, #0b6689);
  color: #fff;
  box-shadow: 0 22px 54px rgba(8, 47, 77, .2);
}

.eyebrow {
  display: block;
  margin-bottom: 10px;
  color: #8be0e7;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .12em;
}

.calc-hero h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
}

.calc-hero p {
  max-width: 800px;
  margin: 14px 0 0;
  color: rgba(255, 255, 255, .82);
  line-height: 1.8;
}

.hero-badge {
  min-width: 132px;
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 14px;
  background: rgba(255, 255, 255, .09);
  text-align: center;
}

.hero-badge strong {
  display: block;
  color: #ffb075;
  font-size: 28px;
}

.hero-badge span { font-size: 12px; }

.boundary,
.formula,
.panel,
.contact-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--white);
  box-shadow: 0 12px 30px rgba(8, 47, 77, .065);
}

.boundary {
  margin: 20px 0;
  padding: 18px 22px;
  border-left: 4px solid var(--orange);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.boundary strong { color: var(--navy); }

.workspace {
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
  gap: 20px;
}

.panel { padding: 26px; }

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
  margin-bottom: 18px;
}

.panel h2 {
  margin: 0;
  color: var(--navy);
  font-size: 22px;
}

.panel-head small {
  max-width: 280px;
  color: var(--muted);
  line-height: 1.5;
  text-align: right;
}

.fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 15px;
}

.field {
  display: grid;
  gap: 7px;
}

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

.field label {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: #304b5e;
  font-size: 14px;
  font-weight: 700;
}

.field label span {
  color: var(--muted);
  font-weight: 500;
}

.field input,
.field select {
  width: 100%;
  padding: 12px 13px;
  border: 1px solid #b9ccd6;
  border-radius: 8px;
  background: #fbfdfe;
  color: var(--ink);
  outline: 0;
}

.field input:focus,
.field select:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(45, 155, 169, .14);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.btn {
  padding: 11px 17px;
  border: 0;
  border-radius: 8px;
  background: var(--blue);
  color: #fff;
  font-weight: 800;
  cursor: pointer;
}

.btn.orange { background: var(--orange); }
.btn.ghost { background: #e9f1f4; color: var(--navy); }

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.metric {
  min-height: 106px;
  padding: 17px;
  border: 1px solid #d6e5ea;
  border-radius: 11px;
  background: linear-gradient(145deg, #f9fcfd, #edf6f7);
}

.metric span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.metric strong {
  display: inline-block;
  margin-top: 10px;
  color: var(--orange);
  font-size: clamp(24px, 3vw, 32px);
}

.metric em {
  margin-left: 6px;
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

.messages {
  display: grid;
  gap: 8px;
  margin-top: 15px;
}

.message {
  padding: 11px 13px;
  border-radius: 8px;
  background: #eaf6ef;
  color: #236344;
  font-size: 13px;
  line-height: 1.6;
}

.message.warn { background: #fff3e8; color: #915121; }
.message.error { background: #fbeae8; color: var(--red); }

.formula {
  margin-top: 20px;
  padding: 22px 26px;
}

.formula h2 {
  margin: 0 0 12px;
  color: var(--navy);
  font-size: 20px;
}

.formula code {
  display: block;
  margin: 8px 0;
  padding: 9px 11px;
  border-radius: 7px;
  background: #edf3f6;
  color: #123b55;
  font-family: Consolas, monospace;
  white-space: normal;
}

.formula p,
.formula li {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.contact-card {
  display: grid;
  grid-template-columns: 1fr 126px;
  gap: 22px;
  align-items: center;
  margin-top: 20px;
  padding: 24px;
}

.contact-card h2 { margin: 0 0 10px; color: var(--navy); }
.contact-card p { margin: 5px 0; color: var(--muted); line-height: 1.65; }
.contact-card img { width: 126px; height: 126px; object-fit: contain; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 12px;
}

.tag {
  padding: 5px 9px;
  border-radius: 999px;
  background: #e9f3f5;
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
}

.footnote {
  padding: 18px 0 0;
  color: #71818c;
  font-size: 12px;
  text-align: center;
}

@media (max-width: 820px) {
  .calc-page { width: min(100% - 18px, 1180px); padding-top: 18px; }
  .calc-hero { grid-template-columns: 1fr; padding: 28px 22px; }
  .hero-badge { display: none; }
  .workspace { grid-template-columns: 1fr; }
  .panel { padding: 21px 18px; }
  .panel-head { display: block; }
  .panel-head small { display: block; margin-top: 7px; text-align: left; }
  .fields,
  .metrics { grid-template-columns: 1fr; }
  .contact-card { grid-template-columns: 1fr; text-align: center; }
  .contact-card img { margin: 0 auto; }
  .tags { justify-content: center; }
}

@media print {
  body { background: #fff; }
  .calc-page { width: 100%; padding: 0; }
  .actions,
  .contact-card,
  .hbcc-toolbar,
  .hbcc-ad,
  .hbcc-counter { display: none !important; }
  .panel,
  .formula,
  .boundary,
  .calc-hero { box-shadow: none; break-inside: avoid; }
}