:root {
  --color-bg: #fbfbfc;
  --color-bg-block: #fff;
  --color-text: #555;
  --color-sub-text: #888;
  --color-accent: #89c1ee;
  --color-border: #d9d9d9;
  --color-bg-copyright: #444;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #101a24;
    --color-bg-block: #162030;
    --color-text: #e0e8f0;
    --color-sub-text: #888;
    --color-accent: #1e8fcf;
    --color-border: #283848;
    --color-bg-copyright: #444;
  }
}

* {
  box-sizing: border-box;
}

body {
  background: var(--color-bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans JP", "Meiryo", sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  margin: 0;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

@media (min-width: 768px) {
  a:hover {
    opacity: .7;
  }
}

.br-sp {
  display: none;
}

@media (max-width: 767px) {
  .br-sp {
    display: block;
  }
}

.container {
  width: 100%;
  padding-left: 20px;
  padding-right: 20px;
  padding-top: 40px;
  padding-bottom: 40px;
  margin-left: auto;
  margin-right: auto;
}

@media (min-width: 768px) {
  .container {
    max-width: 1200px;
  }
}

.header-title {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  line-height: 1.5;
  letter-spacing: 0.12em;
  color: var(--color-text);
  font-weight: 700;
}

@media (max-width: 767px) {
  .header-title {
    font-size: 18px;
  }
}

.header-description {
  font-size: 13px;
  line-height: 2;
  text-align: center;
  letter-spacing: 0.04em;
  color: var(--color-sub-text);
  margin-bottom: 1.2rem;
  margin-top: 1.2rem;
}

@media (max-width: 767px) {
  .header-description {
    font-size: 11px;
    margin-top: 10px;
  }
}

/* ===== 入力エリアと集計結果のレイアウト ===== */
.counter-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .counter-layout {
    grid-template-columns: 1fr 320px;
    align-items: start;
  }
}

.input-block {
  display: flex;
  flex-direction: column;
}

.input-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.label {
  font-size: 14px;
}

.btn-clear {
  display: inline-block;
  font-size: 12px;
  color: var(--color-sub-text);
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  cursor: pointer;
  padding-left: 12px;
  padding-right: 12px;
  padding-top: 4px;
  padding-bottom: 4px;
}

@media (min-width: 768px) {
  .btn-clear {
    transition: background 0.2s;
  }
}

@media (min-width: 768px) {
  .btn-clear:hover {
    background: var(--color-border);
  }
}

.input-text {
  display: block;
  width: 100%;
  min-height: 320px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-bg-block);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: inherit;
  resize: vertical;
  padding: 12px;
}

@media (min-width: 768px) {
  .input-text {
    min-height: 480px;
  }
}

.input-text:focus {
  border-color: var(--color-accent);
  outline: none;
}

.input-text::placeholder {
  color: var(--color-border);
}

/* ===== 集計結果 ===== */
@media (min-width: 768px) {
  .stats {
    position: sticky;
    top: 20px;
  }
}

.stats-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

@media (min-width: 768px) {
  .stats-list {
    grid-template-columns: 1fr;
    gap: 10px;
  }
}

.stats-item {
  display: flex;
  flex-direction: column;
  background: var(--color-bg-block);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding-left: 14px;
  padding-right: 14px;
  padding-top: 10px;
  padding-bottom: 10px;
}

@media (min-width: 768px) {
  .stats-item {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.stats-label {
  font-size: 12px;
  color: var(--color-sub-text);
}

@media (max-width: 767px) {
  .stats-label {
    font-size: 11px;
  }
}

.stats-value {
  display: flex;
  align-items: baseline;
}

@media (max-width: 767px) {
  .stats-value {
    margin-top: 2px;
  }
}

.stats-number {
  font-size: 20px;
  color: var(--color-text);
  font-weight: 700;
}

@media (max-width: 767px) {
  .stats-number {
    font-size: 18px;
  }
}

.stats-unit {
  font-size: 11px;
  color: var(--color-sub-text);
  margin-left: 2px;
}

/* ===== フッター ===== */
.attention {
  text-align: center;
  padding-left: 20px;
  padding-right: 20px;
  padding-top: 56px;
  padding-bottom: 56px;
}

@media (max-width: 767px) {
  .attention {
    padding-top: 40px;
    padding-bottom: 40px;
  }
}

.attention-text {
  font-size: 12px;
  line-height: 2;
  letter-spacing: 0.04em;
  color: var(--color-sub-text);
}

@media (max-width: 767px) {
  .attention-text {
    font-size: 10px;
  }
}

.attention-text--brand {
  margin-top: 20px;
  letter-spacing: 0.1em;
}

.attention-text--brand::before {
  content: '';
  display: block;
  width: 20px;
  height: 1px;
  background: var(--color-text);
  margin: 2rem auto 1rem;
}

.related-tools {
  padding-left: 20px;
  padding-right: 20px;
  padding-top: 40px;
  padding-bottom: 40px;
}

.related-tools-inner {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
}

@media (min-width: 768px) {
  .related-tools-inner {
    max-width: 1200px;
  }
}

.related-tools-heading {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: bold;
  letter-spacing: 0.12em;
  color: var(--color-sub-text);
  margin-bottom: 20px;
}

.related-tools-heading::before,
.related-tools-heading::after {
  content: '';
  width: 40px;
  height: 1px;
  background: var(--color-border);
}

.related-tools-heading::before {
  margin-right: 10px;
}

.related-tools-heading::after {
  margin-left: 10px;
}

.related-tools-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  padding: 0;
}

.related-tools-item {
  list-style: none;
  background: var(--color-bg-block);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.related-tools-link {
  display: flex;
  align-items: center;
  padding: 14px 14px 14px 14px;
}

@media (min-width: 768px) {
  .related-tools-link {
    transition: opacity 0.2s;
  }
}

@media (min-width: 768px) {
  .related-tools-link:hover {
    opacity: 0.7;
  }
}

.related-tools-icon {
  width: 32px;
  height: auto;
  margin-right: 14px;
}

.related-tools-body {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.related-tools-catch {
  font-size: 13px;
  color: var(--color-text);
  margin-bottom: 4px;
}

@media (max-width: 767px) {
  .related-tools-catch {
    font-size: 11px;
  }
}

.related-tools-name {
  font-size: 16px;
  color: var(--color-accent);
  font-weight: bold;
}

@media (max-width: 767px) {
  .related-tools-name {
    font-size: 14px;
  }
}

.related-tools-arrow {
  position: relative;
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-left: 12px;
}

.related-tools-arrow::before,
.related-tools-arrow::after {
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 1.5px;
  background: var(--color-accent);
  content: '';
}

.related-tools-arrow::before {
  transform: translateY(-2.5px) rotate(45deg);
}

.related-tools-arrow::after {
  transform: translateY(2.5px) rotate(-45deg);
}

.footer {
  text-align: center;
  background: var(--color-bg-copyright);
  padding-top: 20px;
  padding-bottom: 20px;
}

.footer-note {
  display: block;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: #fff;
  margin-bottom: 4px;
}

.footer-copyright {
  display: block;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: #fff;
}

@media (max-width: 767px) {
  .footer-copyright {
    font-size: 10px;
  }
}