:root {
  --primary-color: #6366f1;     
  --accent-color: #0f172a;      
  --bg-color: #f9fafb;          
  --fieldset-bg: #eef2ff;       
  --border-color: #d1d5db;      
  --text-color: #111827;        
  --placeholder-color: #9ca3af; 
  --table-header-bg: #e0e7ff;   
  --resvalue-bg: #f2f2f2;
  --input-disabled-bg: #f3f4f6;
  --input-disabled-color: #6b7280;
  --button-disabled-bg: #d7dbe4;
  --button-disabled-color: #a2abbd;
  --button-hover-bg: #a4a5f3;
}

body {
  font-family: "Inter", "Segoe UI", sans-serif;
  font-size: 17px;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0.8rem 2rem 2rem 2rem;
  font-weight: 400;
}

h1 {
  text-align: center;
  font-size: 1.75em;
  margin-bottom: 1.2rem;
  color: var(--accent-color);
  font-weight: 600; 
  letter-spacing: -0.5px;
}

h2 {
  text-align: center;
  font-size: 1.2em;
  margin-bottom: 1rem;
  color: var(--accent-color);
  font-weight: 500;
  letter-spacing: -0.2px;
}

.form-container {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.horizontal-fieldsets {
  display: flex;
  flex-wrap: nowrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: flex-start;
}

.horizontal-fieldsets > fieldset, .bom-fieldset {
  flex: 1;
  min-width: 250px;
  background-color: var(--fieldset-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
  transition: box-shadow 0.3s ease;
}

fieldset:hover {
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.12);
}

legend {
  font-weight: 600;
  padding: 0 0.5rem;
  color: var(--primary-color);
  font-size: 1.1em;
}

.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 0.9rem;
}

label {
  margin-bottom: 0.15rem;
  font-weight: 500;
}

input[type="number"], input[type="text"], textarea {
  padding: 0.5rem 0.6rem;
  font-size: 1rem;
  border: 1px solid #bbb;
  border-radius: 6px;
  font-family: inherit;
  background-color: #fff;
  color: var(--text-color);
  transition: border-color 0.3s ease;
}

input:focus, textarea:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 3px var(--primary-color);
}

input::placeholder, textarea::placeholder {
  font-style: italic;
  font-size: 0.92rem;
  color: var(--placeholder-color);
}

textarea {
  resize: vertical;
  min-height: 4em;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  overflow-wrap: break-word;
}

.checkbox-group, .radio-group {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 0.3rem;
}

.checkbox-group label, .radio-group label {
  gap: 0;
}

button {
  font-family: "Inter", sans-serif;
  padding: 0.75rem 1.5rem;
  background-color: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: background-color 0.3s ease;
}

input[type="text"], input[type="number"], textarea {
  font-weight: 400;
  letter-spacing: 0.15px;
}

th {
  background-color: var(--table-header-bg);
  font-weight: 600;
  color: var(--accent-color);
  cursor: pointer;
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: #fffefc;
  margin-top: 2rem;
  font-size: 0.96em;
  box-shadow: 0 3px 5px rgba(0, 0, 0, 0.04);
}

th, td {
  padding: 0.75rem;
  border: 1px solid #ddd;
  text-align: center;
}

th.sort-asc::after {
  content: " ▲";
}

th.sort-desc::after {
  content: " ▼";
}

th[data-nosort] {
  cursor: default;
}

#results-warning {
  color: #c00;
  font-weight: bold;
  margin-top: 1rem;
}

.res {
  padding: auto 0.3rem;
  margin: auto 0.2rem;
  font-family: monospace;
  background-color: var(--resvalue-bg);
}

.tap {
  margin: auto 0.5rem;
}

#series-select {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.2rem;
  margin-top: 0.4rem;
}

#series-select label {
  display: flex;
  align-items: center;
  font-weight: normal;
  font-size: 0.95em;
  cursor: pointer;
}

#series-select input[type="radio"] {
  margin-right: 0.4em;
  accent-color: var(--primary-color);
}

input.error, textarea.error {
  background-color: #ffe4e6 !important;
  border-color: #dc2626 !important;
}

#bom-warning {
  display: none;
  font-weight: bold;
  color: #dc2626;
  margin-top: 0.4rem;
}

.res {
  padding: 0.3em;
  font-family: monospace;
  cursor: pointer;
  transition: text-decoration 0.2s;
}

.preset-fieldset {
  flex: 0 1 auto;
  max-width: 10rem;
  background-color: var(--fieldset-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
}

.preset-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.4rem;
  margin-bottom: 0.6rem;
}

.preset-grid div {
  display: flex;
  gap: 0.4rem;
}

.preset-load,
.preset-save,
.reset-form {
  flex: 1 1 auto;
  font-size: 0.8rem;
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
  text-align: center;
  transition: background-color 0.2s ease;
}

.preset-load {
  background-color: #e5ffec; 
  color: #065f46; 
}

.preset-save {
  background-color: #ffefdc; 
  color: #c2410c; 
}

.reset-form {
  background-color: #ccdaff; 
  color: #374151; 
  opacity: 0.85;
}

.reset-container {
  display: flex;
  justify-content: flex-start;
}

.calculate-container {
  display: flex;
  align-items: flex-start;
  padding-top: 1.25rem;
}

.bom-and-calc {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  margin-top: 1rem;
}

.bom-and-calc .bom-fieldset {
  flex: 1;
  min-width: 0;
}

.calculate-container {
  display: flex;
  align-items: flex-start;
  padding-top: 1.75rem;
}

#calculate {
  height: 3.2rem;
  padding: 0 1.2rem;
  font-size: 1.05rem;
  white-space: nowrap;
}

button:hover {
  background-color: var(--button-hover-bg);
}

input:disabled,
textarea:disabled {
  background-color: var(--input-disabled-bg) !important;
  color: var(--input-disabled-color) !important;
  cursor: not-allowed;
}

button:disabled {
  background-color: var(--button-disabled-bg) !important;
  color: var(--button-disabled-color) !important;
  cursor: not-allowed;
}