:root {
  --color-ink: #1f1f21;
  --color-muted: #687780;
  --color-subtle: #7d8c95;
  --color-disabled: #b9c7cf;
  --color-paper: #ffffff;
  --color-surface: #f7f9fa;
  --color-surface-strong: #eef2f4;
  --color-accent: #526b7a;
  --color-accent-hover: #445c69;
  --color-accent-soft: #e7edf0;
  --color-ring: #a9bac3;
  --color-strong: #344a55;
  --color-strong-hover: #2d414b;
  --color-destructive: #b85a5a;
  --color-destructive-hover: #974a4a;
  --border-subtle: rgba(30, 42, 48, 0.08);
  --border-default: rgba(30, 42, 48, 0.14);
  --font-sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI", sans-serif;
  --radius: 8px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 20px;
  --space-xl: 24px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  min-width: 0;
  color: var(--color-ink);
  background: var(--color-paper);
  font-family: var(--font-sans);
  font-synthesis: none;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  min-width: 0;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background: var(--color-paper);
}

.page-shell {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}

button,
textarea {
  font: inherit;
}

button,
label,
textarea,
a {
  touch-action: manipulation;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.app {
  flex: 1;
  width: min(100%, 960px);
  min-width: 0;
  margin: 0 auto;
  padding: 20px 20px 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  width: 100%;
  border-bottom: 1px solid var(--border-subtle);
  padding: 18px 20px 8px;
  background: color-mix(in srgb, var(--color-paper) 92%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.site-header-inner {
  display: flex;
  width: 100%;
  min-width: 0;
  min-height: 40px;
  max-width: 1320px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.site-identity {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-ink);
  text-decoration: none;
}

h1,
.site-title {
  margin: 0;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: 0.02em;
  overflow-wrap: anywhere;
}

.site-mark {
  display: block;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
}

.tool-link {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 6px;
  padding: 0 2px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.25;
  text-decoration-color: var(--border-default);
  text-underline-offset: 4px;
}

.tool-link:hover {
  color: var(--color-accent-hover);
  text-decoration-color: currentColor;
}

.tool-link:focus-visible,
.site-identity:focus-visible,
.footer-brand:focus-visible,
.reset-button:focus-visible,
.output-copy-button:focus-visible,
.checkbox-input:focus-visible,
.options-accordion-trigger:focus-visible,
.mobile-paste-input:focus-visible {
  outline: 3px solid var(--color-ring);
  outline-offset: 2px;
}

.workspace {
  min-width: 0;
}

.section-head {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-xs);
}

.section-title {
  margin: 0;
  font-size: 20px;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: 0.02em;
}

.count {
  margin-left: 4px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 400;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
  white-space: nowrap;
}

.reset-button {
  display: inline-flex;
  height: 32px;
  align-items: center;
  gap: 6px;
  border: 0;
  margin: 0 -8px;
  padding: 0 8px;
  color: var(--color-destructive);
  background: transparent;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.25;
  transition: color 150ms ease;
  cursor: pointer;
}

.reset-button:hover:not(:disabled) {
  color: var(--color-destructive-hover);
}

.reset-button:disabled {
  color: var(--color-disabled);
  cursor: not-allowed;
}

.reset-icon {
  width: 14px;
  height: 14px;
  flex: 0 0 14px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.text-action-dotline {
  padding-bottom: 2px;
  background-image: radial-gradient(circle, currentColor 0.6px, transparent 0.6px);
  background-position: 0 100%;
  background-repeat: repeat-x;
  background-size: 3px 3px;
  white-space: nowrap;
}

.desktop-paste-surface,
.mobile-paste-input {
  width: 100%;
  min-width: 0;
  min-height: 48px;
  border-radius: var(--radius);
  color: var(--color-muted);
  background: var(--color-surface);
}

.desktop-paste-surface {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  border: 0;
  padding: 11px 14px;
  font-size: 14px;
  line-height: 1.4;
  user-select: none;
}

kbd {
  border: 1px solid var(--border-default);
  border-radius: 5px;
  padding: 2px 6px;
  color: var(--color-accent);
  background: var(--color-paper);
  font: inherit;
  font-weight: 600;
}

.mobile-paste-input {
  display: none;
  height: 120px;
  resize: none;
  overflow: auto;
  border: 1px solid var(--border-subtle);
  padding: 12px 14px;
  color: var(--color-ink);
  font-size: 16px;
  line-height: 1.4;
}

.mobile-paste-input::placeholder {
  color: var(--color-subtle);
  font-size: 14px;
  opacity: 1;
}

.output-text:empty::before {
  content: attr(data-placeholder);
  color: var(--color-subtle);
  font-size: 14px;
  line-height: 1.4;
}

.options-fieldset {
  min-width: 0;
  margin: var(--space-lg) 0 0;
  border: 0;
  padding: 0;
}

.options-desktop-legend {
  margin: 0 0 4px;
  padding: 0;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.25;
}

.options-accordion-trigger {
  display: none;
}

.options-collapse {
  display: grid;
  grid-template-rows: 1fr;
  opacity: 1;
}

.options-collapse-inner {
  min-height: 0;
  overflow: visible;
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(136px, 1fr));
  gap: var(--space-xs) var(--space-md);
}

.checkbox-option {
  display: flex;
  min-width: 0;
  min-height: 52px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 0 2px;
  color: var(--color-ink);
}

.checkbox-control {
  display: inline-flex;
  width: fit-content;
  max-width: 100%;
  min-height: 32px;
  align-items: center;
  gap: var(--space-xs);
  cursor: pointer;
  user-select: none;
}

.checkbox-input {
  position: relative;
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--border-default);
  border-radius: 4px;
  background: var(--color-paper);
  cursor: pointer;
}

.checkbox-input::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 4px;
  height: 8px;
  border: solid var(--color-paper);
  border-width: 0 2px 2px 0;
  content: "";
  transform: translate(-50%, -58%) rotate(45deg) scale(0);
  transform-origin: center;
}

.checkbox-input:checked {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

.checkbox-input:checked::after {
  transform: translate(-50%, -58%) rotate(45deg) scale(1);
}

.checkbox-label {
  min-width: 0;
  font-size: 14px;
  line-height: 1.25;
  overflow-wrap: anywhere;
}

.option-count {
  margin-left: 26px;
  color: var(--color-subtle);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  line-height: 1.25;
  pointer-events: none;
  user-select: none;
}

.output-section {
  margin-top: 32px;
}

.output-text {
  position: relative;
  display: block;
  width: 100%;
  min-width: 0;
  min-height: 320px;
  height: 320px;
  overflow: hidden;
  border: 0;
  border-radius: var(--radius);
  padding: 14px 16px;
  color: var(--color-ink);
  background: var(--color-surface);
  font-size: 16px;
  line-height: 1.6;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  tab-size: 4;
  pointer-events: none;
  user-select: none;
}

.output-text.is-clipped::after {
  position: absolute;
  display: flex;
  right: 0;
  bottom: 0;
  left: 0;
  height: 32px;
  align-items: center;
  justify-content: center;
  color: var(--color-subtle);
  background: var(--color-surface-strong);
  content: "全文コピーされます";
  font-size: 14px;
  line-height: 1;
}

.output-copy-control {
  position: relative;
  flex: 0 0 auto;
}

.output-copy-button {
  display: inline-flex;
  height: 32px;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 0;
  margin: 0 -8px;
  padding: 0 8px;
  color: var(--color-muted);
  background: transparent;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.25;
  cursor: pointer;
}

.output-copy-button:hover:not(:disabled) {
  color: var(--color-accent-hover);
}

.output-copy-button:disabled {
  color: var(--color-disabled);
  cursor: not-allowed;
}

.copy-icon {
  display: block;
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.copy-status {
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 1;
  width: max-content;
  max-width: min(280px, calc(100vw - 40px));
  margin: 0;
  padding-top: 4px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.4;
}

.copy-status:empty {
  display: none;
}

.copy-status.is-error {
  color: var(--color-destructive);
}

.toast-viewport {
  position: fixed;
  bottom: max(24px, env(safe-area-inset-bottom));
  left: 24px;
  z-index: 60;
  width: 300px;
  max-width: calc(100vw - 32px);
  pointer-events: none;
}

.copy-toast {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  border-radius: 10px;
  padding: 10px 22px;
  color: var(--color-paper);
  visibility: hidden;
  background: rgba(24, 24, 27, 0.9);
  box-shadow: 0 10px 24px rgba(20, 25, 28, 0.18);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.25;
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 180ms ease,
    transform 180ms cubic-bezier(0.22, 1, 0.36, 1),
    visibility 0s linear 180ms;
}

.copy-toast.is-visible {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0s;
}

.site-footer {
  width: 100%;
  margin-top: 80px;
  background: var(--color-surface);
  line-height: 1.5;
}

.site-footer-inner {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 20px;
}

.footer-brand {
  display: block;
  color: var(--color-ink);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.5;
  text-decoration: none;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.footer-link {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 20px;
  text-decoration: none;
}

.footer-link:hover,
.support-toc a:hover,
.inline-link:hover {
  color: var(--color-ink);
}

.support-page {
  flex: 1;
  width: min(100%, 672px);
  margin: 0 auto;
  padding: 32px 20px 64px;
  line-height: 1.5;
}

.support-title {
  font-size: 23px;
  line-height: 1.17;
}

.support-toc {
  margin-top: var(--space-xl);
}

.support-toc-list {
  display: flex;
  margin: 0;
  padding: 0;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-xs);
  list-style: none;
}

.support-toc a {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 20px;
  text-decoration: none;
}

.support-sections {
  display: flex;
  margin-top: 40px;
  flex-direction: column;
  gap: 40px;
}

.support-section {
  scroll-margin-top: 80px;
}

.support-section h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: normal;
}

.support-section h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.5;
}

.support-section p,
.support-section li {
  font-size: 16px;
  line-height: 1.4;
}

.support-section > p,
.policy-block p,
.policy-block ul {
  margin: var(--space-sm) 0 0;
}

.policy-block {
  margin-top: 32px;
}

#faq > .policy-block:first-of-type {
  margin-top: var(--space-sm);
}

.policy-block p + p {
  margin-top: var(--space-sm);
}

.policy-block ul {
  padding-left: var(--space-lg);
}

.inline-link {
  color: var(--color-muted);
  text-decoration: underline;
  text-decoration-color: currentColor;
  text-underline-offset: 3px;
}

.support-section > .inline-link {
  display: inline-block;
  margin-top: var(--space-sm);
  font-size: 16px;
  line-height: 1.4;
}

.inline-link.external-link {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  text-decoration: none;
}

.external-link-label {
  text-decoration: underline;
  text-decoration-color: currentColor;
}

.external-mark {
  flex: 0 0 auto;
  line-height: 1;
  text-decoration: none;
}

.enactment-date {
  color: var(--color-muted);
}

.support-section > .enactment-date {
  margin-top: 32px;
}

.footer-link:focus-visible,
.support-toc a:focus-visible,
.inline-link:focus-visible {
  outline: 3px solid var(--color-ring);
  outline-offset: 2px;
}

@media (max-width: 600px) {
  .app {
    padding: 12px 20px 0;
  }

  .tool-link {
    justify-content: flex-end;
    text-align: right;
  }

  .desktop-paste-surface {
    display: none;
  }

  .mobile-paste-input {
    display: block;
  }

  .options-fieldset {
    margin-top: var(--space-sm);
  }

  .options-desktop-legend {
    display: none;
  }

  .options-accordion-trigger {
    display: flex;
    width: 100%;
    height: 48px;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    border: 0;
    padding: 0;
    color: var(--color-ink);
    background: transparent;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.25;
    text-align: left;
    cursor: pointer;
  }

  .options-accordion-trigger[aria-expanded="true"] {
    color: var(--color-accent);
  }

  .options-accordion-meta {
    display: inline-flex;
    flex: 0 0 auto;
    align-items: center;
    gap: var(--space-xs);
  }

  .options-summary {
    color: var(--color-subtle);
    font-size: 12px;
    font-weight: 400;
    white-space: nowrap;
  }

  .options-chevron {
    width: 20px;
    height: 20px;
    flex: 0 0 20px;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: transform 200ms ease-out;
  }

  .options-accordion-trigger[aria-expanded="true"] .options-chevron {
    transform: rotate(180deg);
  }

  .options-collapse {
    grid-template-rows: 0fr;
    opacity: 0;
    transition:
      grid-template-rows 200ms ease-out,
      opacity 200ms ease-out;
  }

  .options-collapse.is-open {
    grid-template-rows: 1fr;
    opacity: 1;
  }

  .options-collapse-inner {
    overflow: hidden;
  }

  .options-grid {
    padding-top: 4px;
  }

  .options-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-xs) var(--space-sm);
  }

  .checkbox-option {
    min-height: 64px;
  }

  .checkbox-control {
    min-height: 44px;
  }

  .output-section {
    margin-top: var(--space-xl);
  }

  .output-copy-button {
    height: 44px;
    margin: 0 -8px;
  }

  .toast-viewport {
    right: 16px;
    left: 16px;
    width: auto;
    max-width: none;
  }

.site-footer {
    margin-top: 48px;
  }

}

@media (prefers-reduced-motion: reduce) {
  .options-collapse,
  .options-chevron {
    transition: none;
  }
}

@media (min-width: 640px) {
  .site-header-inner,
  .tool-link {
    min-height: 36px;
  }

  .reset-button {
    height: 28px;
    margin: 0 -4px;
    padding-right: 4px;
    padding-left: 4px;
  }
}

@media (min-width: 1024px) {
  .app,
  .site-header,
  .site-footer-inner,
  .support-page {
    padding-right: 40px;
    padding-left: 40px;
  }

  .support-page {
    padding-top: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}