:root {
  --bg: #121212;
  --text: #eee;
  --accent: #4caf50;
  --input-bg: #1e1e1e;
  --input-border: #333;
  --error: #f44336;
}

body {
  margin: 0;
  padding: 1rem;
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  align-items: center;
}

h1 {
  margin-bottom: 1rem;
  animation: reveal 0.6s ease both;
}

form {
  background: var(--input-bg);
  padding: 1rem 1.5rem;
  border-radius: 8px;
  width: 100%;
  max-width: 400px;
  box-sizing: border-box;
  animation: reveal 0.6s ease 0.15s both;
}

@keyframes reveal {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

label {
  display: block;
  margin-bottom: 0.3rem;
  font-weight: 600;
}

input[type=number] {
  width: 100%;
  padding: 0.4rem 0.6rem;
  margin-bottom: 1rem;
  border: 1px solid var(--input-border);
  border-radius: 4px;
  background: var(--input-bg);
  color: var(--text);
  font-size: 1rem;
  box-sizing: border-box;
}

button {
  background-color: var(--accent);
  color: var(--bg);
  border: none;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  border-radius: 4px;
  cursor: pointer;
  width: 100%;
  font-weight: 700;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #388e3c;
}

.result {
  margin-top: 1.5rem;
  background: var(--input-bg);
  padding: 1rem;
  border-radius: 8px;
  max-width: 400px;
  width: 100%;
  box-sizing: border-box;
  margin-left: auto;
  margin-right: auto;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.disk-bar {
  display: flex;
  width: 100%;
  height: 28px;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.disk-bar-segment {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  transition: width 0.5s ease;
}

.disk-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
  justify-content: center;
}

.disk-legend-item {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  color: #aaa;
}

.disk-legend-color {
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

.result h2 {
  text-align: center;
}

table {
  width: 100%;
  border-collapse: collapse;
  color: var(--text);
}

th, td {
  padding: 0.5rem 0.7rem;
  border-bottom: 1px solid #333;
  text-align: center;
}

th:first-child, td:first-child {
  text-align: left;
}

.notes {
  margin-top: 0.8rem;
  padding-left: 1.2rem;
  font-size: 0.85rem;
  color: #aaa;
  list-style: none;
}

.notes li {
  margin-bottom: 0.3rem;
}

.notes code {
  color: var(--accent);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 1rem;
  font-weight: 400;
  cursor: pointer;
}

.checkbox-label input[type=checkbox] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.error {
  color: var(--error);
  margin-bottom: 1rem;
  font-weight: 600;
}

.info-wrapper {
  position: fixed;
  top: 1rem;
  right: 1rem;
}

.info-btn {
  background: transparent;
  border: none;
  color: #aaa;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.2rem;
  width: auto;
  transition: color 0.3s ease;
}

.info-btn:hover {
  color: var(--accent);
  background: transparent;
}

.info-tooltip {
  display: none;
  position: absolute;
  top: 2.2rem;
  right: 0;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text);
  padding: 0.5rem 0.8rem;
  border-radius: 6px;
  white-space: nowrap;
  font-size: 0.85rem;
}

.info-tooltip.visible {
  display: block;
}

@media (max-width: 450px) {
  body {
    padding: 1rem 0.5rem;
  }
  form, .result {
    max-width: 100%;
  }
  table, thead, tbody, th, td, tr {
    display: block;
  }
  thead {
    display: none;
  }
  tr {
    margin-bottom: 0.8rem;
    border-bottom: 2px solid #444;
    padding-bottom: 0.5rem;
  }
  td {
    text-align: right;
    padding: 0.3rem 0.5rem;
    border-bottom: none;
  }
  td::before {
    content: attr(data-label);
    float: left;
    font-weight: 600;
    color: var(--accent);
  }
}