:root {
  --pc-bg: #f6f7fb;
  --pc-surface: #ffffff;
  --pc-border: #d6d9e2;
  --pc-accent: #2c7be5;
  --pc-accent-soft: #e2edff;
  --pc-text: #22252f;
  --pc-text-muted: #60657a;
  --pc-radius: 12px;
  --pc-shadow: 0 6px 16px rgba(15, 23, 42, 0.08);
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--pc-bg);
  color: var(--pc-text);
  line-height: 1.5;
}

.pc-page {
  max-width: 1100px;
  margin: 2rem auto;
  padding: 0 1rem 3rem;
}

.pc-header {
  margin-bottom: 1.5rem;
  text-align: left;
}

.pc-header h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
}

.pc-header p {
  margin: 0;
  color: var(--pc-text-muted);
}

.paint-calculator {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.pc-inputs,
.pc-results {
  background: var(--pc-surface);
  border-radius: var(--pc-radius);
  padding: 1.5rem;
  box-shadow: var(--pc-shadow);
  border: 1px solid var(--pc-border);
}

.pc-inputs {
  flex: 1 1 340px;
}

.pc-results {
  flex: 1 1 300px;
}

.pc-inputs h2,
.pc-results h2 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

.pc-group {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid #eceef5;
}

.pc-group h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.pc-help {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  color: var(--pc-text-muted);
}

.pc-fieldset {
  border: 1px solid var(--pc-border);
  border-radius: var(--pc-radius);
  padding: 0.75rem 0.75rem 0.5rem;
  margin: 0 0 1rem;
}

.pc-fieldset legend {
  font-size: 0.9rem;
  padding: 0 0.25rem;
  color: var(--pc-text-muted);
}

.pc-radio {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.pc-radio input {
  accent-color: var(--pc-accent);
}

.pc-grid {
  display: grid;
  gap: 0.75rem;
}

.pc-grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

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

label {
  font-size: 0.9rem;
  color: var(--pc-text);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

input[type="number"],
select {
  border-radius: 8px;
  border: 1px solid var(--pc-border);
  padding: 0.4rem 0.55rem;
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  background: #fdfdff;
}

input[type="number"]:focus,
select:focus {
  border-color: var(--pc-accent);
  box-shadow: 0 0 0 1px var(--pc-accent-soft);
}

.pc-button {
  margin-top: 1.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.5rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  background: var(--pc-accent);
  color: #fff;
  transition: transform 0.05s ease, box-shadow 0.1s ease, background 0.1s ease;
  box-shadow: 0 4px 10px rgba(44, 123, 229, 0.35);
}

.pc-button:hover {
  background: #1f6cd0;
}

.pc-button:active {
  transform: translateY(1px);
  box-shadow: 0 2px 6px rgba(44, 123, 229, 0.3);
}

.pc-note {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--pc-text-muted);
}

.pc-result-main {
  font-size: 1rem;
  margin-top: 0.25rem;
}

.pc-result-main strong {
  font-size: 1.1rem;
}

.pc-result-tins {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

.pc-result-tins ul {
  margin: 0.25rem 0 0;
  padding-left: 1.1rem;
}

.pc-summary {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: var(--pc-text-muted);
}

.pc-callout {
  margin-top: 1rem;
  padding: 0.75rem 0.9rem;
  background: var(--pc-accent-soft);
  border-radius: 10px;
  border: 1px solid #c7d8ff;
}

.pc-callout h3 {
  margin: 0 0 0.25rem;
  font-size: 0.9rem;
}

.pc-callout p {
  margin: 0;
  font-size: 0.85rem;
}

.pc-cta {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--pc-accent);
}

.pc-cta:hover {
  text-decoration: underline;
}

.pc-text {
  margin-top: 2rem;
  background: var(--pc-surface);
  border-radius: var(--pc-radius);
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--pc-border);
  box-shadow: var(--pc-shadow);
}

.pc-text h2 {
  margin-top: 0;
  font-size: 1.25rem;
}

.pc-text p {
  margin-top: 0.5rem;
  color: var(--pc-text-muted);
}

/* Responsive */

@media (max-width: 800px) {
  .paint-calculator {
    flex-direction: column;
  }

  .pc-inputs,
  .pc-results {
    width: 100%;
  }

  .pc-grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 500px) {
  .pc-page {
    margin-top: 1.25rem;
  }

  .pc-grid-3,
  .pc-grid-2 {
    grid-template-columns: minmax(0, 1fr);
  }
}