:root {
  --calc-bg: #f5f9ff;
  --calc-card: #ffffff;
  --calc-text: #10243f;
  --calc-muted: #5a6d86;
  --calc-border: #dbe8ff;
  --calc-primary: #265dff;
  --calc-primary-2: #00a4ff;
}

body {
  background: var(--calc-bg);
  color: var(--calc-text);
}

.calc-hero {
  min-height: 330px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 90px 20px 80px;
  background: linear-gradient(120deg, rgba(9, 26, 54, 0.78), rgba(24, 52, 120, 0.6)),
    url("https://images.pexels.com/photos/4778621/pexels-photo-4778621.jpeg?auto=compress&cs=tinysrgb&w=1800")
      center / cover no-repeat;
}

.calc-hero-overlay {
  max-width: 780px;
}

.calc-hero .crumb {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.82rem;
  margin-bottom: 14px;
}

.calc-hero h1 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3rem);
  color: #ffffff;
}

.calc-hero p {
  color: rgba(255, 255, 255, 0.92);
  margin: 14px auto 0;
  font-size: 1rem;
  max-width: 680px;
}

.calculator-page {
  width: min(1200px, 94vw);
  margin: 30px auto 70px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  align-items: start;
}

.tool-card {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 8px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  border: 1px solid var(--calc-border);
  border-radius: 20px;
  padding: 22px;
  box-shadow: 0 18px 45px rgba(17, 45, 97, 0.08);
}

.tool-card:last-child {
  grid-column: 1 / -1;
}

.tool-card h2 {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.tool-note {
  margin: 0 0 14px;
  color: var(--calc-muted);
}

.tool-card label {
  display: block;
  font-weight: 600;
  margin: 10px 0 6px;
  color: #213958;
}

.tool-card input,
.tool-card select {
  width: 100%;
  border-radius: 12px;
  border: 1px solid #cad8f8;
  background: #ffffff;
  padding: 11px 12px;
  font-size: 0.95rem;
  color: var(--calc-text);
}

.tool-card input:focus,
.tool-card select:focus {
  outline: none;
  border-color: #77a1ff;
  box-shadow: 0 0 0 3px rgba(38, 93, 255, 0.12);
}

.tool-card .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 12px;
}

.btn.primary {
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--calc-primary), var(--calc-primary-2));
  color: #ffffff;
  padding: 11px 16px;
  font-weight: 700;
  cursor: pointer;
}

.btn.ghost {
  border: 1px solid #b8ccff;
  border-radius: 12px;
  background: #eef4ff;
  color: #1f4ec8;
  padding: 11px 16px;
  font-weight: 700;
  cursor: pointer;
  margin-right: 8px;
}

.result {
  margin: 14px 0 0;
  min-height: 26px;
  font-weight: 700;
  color: #143f9d;
  background: transparent;
  border: 0;
  box-shadow: none;
  padding: 0;
}

.calculator-page .course-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 8px 0 2px;
}

.calculator-page .course-head {
  display: grid;
  grid-template-columns: 1.35fr 120px 110px 170px;
  gap: 10px;
  color: #617796;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.calculator-page .course-row {
  display: grid;
  grid-template-columns: 1.35fr 120px 110px 170px;
  gap: 10px;
  align-items: center;
  border: 1px solid #d9e5ff;
  border-radius: 12px;
  padding: 10px;
  background: linear-gradient(180deg, #fbfdff 0%, #f3f8ff 100%);
  box-shadow: 0 8px 16px rgba(20, 39, 75, 0.05);
}

.calculator-page .course-row > * {
  min-width: 0;
}

.calculator-page .course-row select {
  width: 100%;
}

.calculator-page .course-row input,
.calculator-page .course-row select {
  width: 100%;
  height: 44px;
  font-weight: 500;
}

@media (max-width: 960px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .calc-hero {
    min-height: 290px;
    padding: 84px 14px 62px;
  }

  .calculator-page {
    width: min(1200px, 95vw);
    margin-top: 24px;
  }

  .tool-card {
    padding: 18px 16px;
  }

  .tool-card .btn {
    width: 100%;
  }

  .btn.ghost {
    margin-right: 0;
  }

  .calculator-page .course-row {
    grid-template-columns: 1fr;
  }

  .calculator-page .course-head {
    display: none;
  }
}