*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #dbe3ef;
  --primary: #0f766e;
  --primary-dark: #0b5d57;
  --accent: #f59e0b;
  --radius: 20px;
  --shadow: 0 16px 50px rgba(15, 23, 42, 0.08);
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.page {
  padding: 32px 16px;
}

.calc {
  max-width: 1100px;
  margin: 0 auto;
}

.calc__inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.calc-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.calc-item--full {
  grid-column: 1 / -1;
}

.calc-item--half {
  grid-column: span 1;
}

.calc-title {
  margin: 0 0 18px;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
}

.material-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.material-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  cursor: pointer;
  transition: 0.2s ease;
  min-height: 100%;
}

.material-card:hover {
  border-color: var(--primary);
}

.material-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.material-card__media {
  display: block;
  overflow: hidden;
  border-radius: 14px;
  background: #eef2f7;
  aspect-ratio: 1.2 / 1;
}

.material-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.material-card__name {
  font-size: 18px;
  font-weight: 700;
}

.material-card__price {
  color: var(--muted);
  font-size: 15px;
}

.material-card:has(input:checked) {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(15, 118, 110, 0.12);
}

.range-box {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.range-box input[type="range"] {
  width: 100%;
}

.range-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  font-size: 16px;
}

.gift-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.gift-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  cursor: pointer;
}

.summary-box {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 16px;
}

.summary-row--total {
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 22px;
  font-weight: 700;
}

.summary-note {
  padding: 14px 16px;
  border-radius: 14px;
  background: #fff7e8;
  color: #8a5a00;
  font-size: 15px;
}

.lead-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.lead-form__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.field input {
  width: 100%;
  height: 56px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  font-size: 16px;
  outline: none;
}

.field input:focus {
  border-color: var(--primary);
}

.btn {
  height: 56px;
  border: 0;
  border-radius: 14px;
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

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

.form-message {
  min-height: 24px;
  font-size: 14px;
}

.form-message.is-success {
  color: #15803d;
}

.form-message.is-error {
  color: #b91c1c;
}

@media (max-width: 980px) {
  .material-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .calc__inner,
  .lead-form__grid {
    grid-template-columns: 1fr;
  }

  .calc-item,
  .calc-item--full,
  .calc-item--half {
    grid-column: auto;
  }

  .calc-title {
    font-size: 20px;
  }

  .page {
    padding: 20px 12px;
  }
}

@media (max-width: 560px) {
  .material-grid {
    grid-template-columns: 1fr;
  }

  .calc-item {
    padding: 18px;
  }
}