:root {
  --color-primary: #14324D;
  --color-accent: #E85D2C;
  --color-accent-dark: #D14E20;
  --color-bg: #F4F7FA;
  --color-card-bg: #FFFFFF;
  --color-text: #1F2A37;
  --color-border: #D8E0E8;
}

* { box-sizing: border-box; }

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

.topbar {
  background: var(--color-primary);
  padding: 18px 24px;
}
.topbar h1 {
  color: #fff;
  margin: 0;
  font-size: 22px;
  letter-spacing: 0.5px;
}

main {
  max-width: 700px;
  margin: 30px auto;
  padding: 0 20px;
}

.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 24px 28px;
  margin-bottom: 24px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.card h2 {
  margin-top: 0;
  color: var(--color-primary);
  font-size: 18px;
}

label {
  display: block;
  margin-bottom: 14px;
  font-size: 14px;
}
input, select {
  display: block;
  margin-top: 4px;
  padding: 10px;
  font-size: 16px;
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}
fieldset {
  margin-bottom: 14px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
}
.hint {
  font-size: 12px;
  color: #6B7684;
  margin: -8px 0 14px;
}
.error {
  color: #C0392B;
  font-size: 13px;
  min-height: 18px;
}

button {
  padding: 10px 22px;
  font-size: 15px;
  cursor: pointer;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: 5px;
  font-weight: 600;
}
button:hover {
  background: var(--color-accent-dark);
}

.button-group {
  display: flex;
  gap: 12px;
  margin-bottom: 18px;
}
.visually-hidden {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.option-button {
  flex: 1;
  text-align: center;
  padding: 14px;
  border: 2px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  background: #fff;
  transition: all 0.15s;
}
.option-button:hover {
  border-color: var(--color-primary);
}
input[type="radio"]:checked + .option-button {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

#drawing-result {
  margin-top: 20px;
}
#drawing-result svg {
  max-width: 100%;
  height: auto;
  display: block;
}

.price-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.price-table td {
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border);
}
.price-table td:last-child {
  text-align: right;
}
.price-total td {
  font-weight: 700;
  font-size: 16px;
  color: var(--color-primary);
  border-bottom: none;
  padding-top: 10px;
}

@media (max-width: 480px) {
  main {
    margin: 16px auto;
    padding: 0 12px;
  }
  .card {
    padding: 16px 18px;
  }
  .topbar {
    padding: 14px 16px;
  }
  .topbar h1 {
    font-size: 18px;
  }
  .option-button {
    padding: 12px 8px;
    font-size: 14px;
  }
}