#eto-calculator-tool {
  --ect-main: #3f6f66;
  --ect-main-deep: #315b54;
  --ect-main-soft: #e7f0ed;
  --ect-bg: #fbfaf7;
  --ect-card: #ffffff;
  --ect-text: #273532;
  --ect-muted: #66736f;
  --ect-border: #d8e2de;
  --ect-accent: #f4eee0;
  --ect-error-bg: #fff4f1;
  --ect-error-border: #e5b9ae;
  --ect-error-text: #7d3e32;
  box-sizing: border-box;
  width: 100%;
  color: var(--ect-text);
  background: var(--ect-bg);
  border: 1px solid var(--ect-border);
  border-radius: 20px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.7;
  overflow: hidden;
}

#eto-calculator-tool,
#eto-calculator-tool * {
  box-sizing: border-box;
}

#eto-calculator-tool[data-theme="dark"] {
  --ect-main: #8fc1b6;
  --ect-main-deep: #b2d8d0;
  --ect-main-soft: #263f3a;
  --ect-bg: #18211f;
  --ect-card: #222e2b;
  --ect-text: #edf3f1;
  --ect-muted: #b5c2be;
  --ect-border: #40504c;
  --ect-accent: #352f23;
  --ect-error-bg: #432e2a;
  --ect-error-border: #82564d;
  --ect-error-text: #ffd4ca;
}

#eto-calculator-tool .ect-shell {
  width: min(100%, 920px);
  margin: 0 auto;
  padding: clamp(18px, 4vw, 40px);
}

#eto-calculator-tool .ect-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

#eto-calculator-tool .ect-brand {
  margin: 0 0 4px;
  color: var(--ect-main);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

#eto-calculator-tool .ect-title {
  color: var(--ect-text);
  font-size: clamp(1.45rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1.35;
}

#eto-calculator-tool .ect-lead {
  margin: 8px 0 0;
  color: var(--ect-muted);
  font-size: 0.96rem;
}

#eto-calculator-tool .ect-theme-button,
#eto-calculator-tool .ect-primary-button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

#eto-calculator-tool .ect-theme-button {
  flex: 0 0 auto;
  padding: 9px 14px;
  color: var(--ect-main-deep);
  background: var(--ect-main-soft);
  font-size: 0.85rem;
}

#eto-calculator-tool .ect-theme-button:hover,
#eto-calculator-tool .ect-primary-button:hover {
  transform: translateY(-1px);
}

#eto-calculator-tool .ect-theme-button:focus-visible,
#eto-calculator-tool .ect-primary-button:focus-visible,
#eto-calculator-tool input:focus-visible {
  outline: 3px solid rgba(63, 111, 102, 0.32);
  outline-offset: 2px;
}

#eto-calculator-tool .ect-intro {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

#eto-calculator-tool .ect-intro-item {
  padding: 13px 14px;
  background: var(--ect-card);
  border: 1px solid var(--ect-border);
  border-radius: 11px;
}

#eto-calculator-tool .ect-intro-label {
  color: var(--ect-main-deep);
  font-size: 0.8rem;
  font-weight: 700;
}

#eto-calculator-tool .ect-intro-item p {
  margin: 3px 0 0;
  color: var(--ect-muted);
  font-size: 0.82rem;
}

#eto-calculator-tool .ect-privacy {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 18px;
  padding: 10px 14px;
  color: var(--ect-main-deep);
  background: var(--ect-main-soft);
  border-radius: 10px;
  font-size: 0.84rem;
}

#eto-calculator-tool .ect-card,
#eto-calculator-tool .ect-results {
  background: var(--ect-card);
  border: 1px solid var(--ect-border);
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(47, 70, 64, 0.06);
}

#eto-calculator-tool .ect-form-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 16px;
  padding: clamp(18px, 3vw, 26px);
}

#eto-calculator-tool .ect-field {
  display: grid;
  gap: 7px;
  min-width: 0;
  font-weight: 700;
}

#eto-calculator-tool .ect-field small {
  color: var(--ect-muted);
  font-size: 0.76rem;
  font-weight: 400;
}

#eto-calculator-tool .ect-field input {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  color: var(--ect-text);
  background: var(--ect-bg);
  border: 1px solid var(--ect-border);
  border-radius: 10px;
  font: inherit;
  color-scheme: light;
}

#eto-calculator-tool[data-theme="dark"] .ect-field input {
  color-scheme: dark;
}

#eto-calculator-tool .ect-primary-button {
  min-height: 48px;
  padding: 11px 24px;
  color: #ffffff;
  background: var(--ect-main-deep);
  white-space: nowrap;
}

#eto-calculator-tool[data-theme="dark"] .ect-primary-button {
  color: #17221f;
}

#eto-calculator-tool .ect-message {
  margin-top: 14px;
  padding: 12px 14px;
  color: var(--ect-error-text);
  background: var(--ect-error-bg);
  border: 1px solid var(--ect-error-border);
  border-radius: 10px;
  font-size: 0.9rem;
}

#eto-calculator-tool .ect-results {
  margin-top: 22px;
  padding: clamp(18px, 3vw, 28px);
}

#eto-calculator-tool .ect-results-heading {
  margin-bottom: 16px;
}

#eto-calculator-tool .ect-section-title {
  color: var(--ect-main-deep);
  font-size: 1.16rem;
  font-weight: 700;
}

#eto-calculator-tool .ect-results-heading p {
  margin: 4px 0 0;
  color: var(--ect-muted);
  font-size: 0.9rem;
}

#eto-calculator-tool .ect-result-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

#eto-calculator-tool .ect-result-card {
  min-width: 0;
  padding: 17px;
  background: var(--ect-bg);
  border: 1px solid var(--ect-border);
  border-radius: 12px;
}

#eto-calculator-tool .ect-result-type {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 9px;
  color: var(--ect-main-deep);
  background: var(--ect-main-soft);
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 700;
}

#eto-calculator-tool .ect-result-basis {
  margin: 0 0 10px;
  color: var(--ect-muted);
  font-size: 0.76rem;
}

#eto-calculator-tool .ect-value-group + .ect-value-group {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--ect-border);
}

#eto-calculator-tool .ect-value-label {
  display: block;
  color: var(--ect-muted);
  font-size: 0.75rem;
}

#eto-calculator-tool .ect-value-main {
  display: block;
  color: var(--ect-text);
  font-size: 1.04rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}

#eto-calculator-tool .ect-value-reading {
  display: block;
  color: var(--ect-muted);
  font-size: 0.78rem;
}

#eto-calculator-tool .ect-basis-note {
  margin-top: 16px;
  padding: 13px 15px;
  background: var(--ect-accent);
  border-radius: 10px;
  font-size: 0.84rem;
}

#eto-calculator-tool .ect-basis-note strong {
  color: var(--ect-main-deep);
}

#eto-calculator-tool .ect-basis-note p {
  margin: 5px 0 0;
}

#eto-calculator-tool .ect-guidance {
  margin-top: 22px;
  padding: clamp(18px, 3vw, 26px);
}

#eto-calculator-tool .ect-guidance > p {
  margin: 9px 0 0;
  font-size: 0.9rem;
}

#eto-calculator-tool .ect-caution {
  padding: 13px 14px;
  background: var(--ect-bg);
  border-left: 4px solid var(--ect-main);
  border-radius: 8px;
}

@media (max-width: 720px) {
  #eto-calculator-tool .ect-intro,
  #eto-calculator-tool .ect-result-list {
    grid-template-columns: 1fr;
  }

  #eto-calculator-tool .ect-form-card {
    grid-template-columns: 1fr;
  }

  #eto-calculator-tool .ect-primary-button {
    width: 100%;
  }
}

@media (max-width: 480px) {
  #eto-calculator-tool .ect-shell {
    padding: 16px;
  }

  #eto-calculator-tool .ect-header {
    flex-direction: column;
    gap: 12px;
  }

  #eto-calculator-tool .ect-theme-button {
    align-self: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  #eto-calculator-tool .ect-theme-button,
  #eto-calculator-tool .ect-primary-button {
    transition: none;
  }
}