:root {
  --color-primary: #00793d;
  --color-secondary: #4a6354;
  --color-background: #ffffff;
  --color-on-background: #1a1c19;
  --shape-corner-medium: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Noto Serif JP', serif;
  background-color: var(--color-background);
  color: var(--color-on-background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  word-break: break-word;
}

header {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 1.5rem 1rem;
  font-weight: 700;
  font-size: clamp(1.8rem, 6vw, 2.2rem);
  text-align: center;
  letter-spacing: 0.08em;
}

main {
  flex-grow: 1;
  width: 100%;
  max-width: 900px;
  margin: 1.5rem auto;
  padding: 0 1rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

section { display: flex; flex-direction: column; gap: 1rem; }

textarea#textInput {
  width: 100%;
  font-size: clamp(1.5rem,5vw,2.5rem);
  min-height: 140px;
  padding: 1rem;
  border-radius: var(--shape-corner-medium);
  border: 2px solid var(--color-primary);
  resize: vertical;
  background-color: var(--color-background);
  color: var(--color-on-background);
  transition: all 0.2s ease;
}

#displayArea {
  width: 100%;
  font-size: clamp(2rem,10vw,8rem);
  font-weight: 600;
  line-height: 1.4;
  padding: 1rem;
  border-radius: var(--shape-corner-medium);
  background-color: var(--color-background);
  border: 2px solid var(--color-primary);
  box-shadow: 0 0 16px var(--color-primary);
  white-space: pre-wrap;
  word-break: break-word;
  color: #000000;
  overflow-wrap: break-word;
  overflow-x: hidden;
  transition: all 0.2s ease;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  width: 100%;
  margin-top: 0.5rem;
}

button {
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  border-radius: var(--shape-corner-medium);
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s ease;
}

.copy-button { background-color: var(--color-primary); color: #fff; }
.clear-button { background-color: #8a6d1d; color: #fff; }
.reset-button { background-color: var(--color-secondary); color: #fff; }

#settings {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  align-items: flex-start;
}

.setting-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 140px;
}

.setting-item label {
  font-weight: 600;
  margin-bottom: 0.5rem;
  text-align: center;
}

.setting-item input[type=range],
.setting-item select,
.setting-item input[type=color] { width: 100%; }

footer#footer {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-secondary);
  padding: 1.5rem 0 2.5rem 0;
}

footer#footer a {
  color: var(--color-primary);
  text-decoration: none;
}

footer#footer a:hover { text-decoration: underline; }