:root {
  --navy: #14335f;
  --blue: #236ca8;
  --light-blue: #eaf5ff;
  --pale-blue: #f6fbff;
  --line: #d7e4ef;
  --text: #1d2733;
  --muted: #5b6878;
  --white: #ffffff;
  --danger: #b42318;
  --danger-bg: #fff1f0;
  --success: #176b45;
  --focus: #f6b73c;
  --shadow: 0 18px 45px rgba(20, 51, 95, 0.12);
}

* {
  box-sizing: border-box;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

body {
  margin: 0;
  color: var(--text);
  background: linear-gradient(180deg, var(--pale-blue) 0%, #ffffff 42%);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.7;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  touch-action: manipulation;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  padding: 48px 0 28px;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 12px;
  color: var(--navy);
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.2;
}

.lead {
  max-width: 720px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.layout {
  display: grid;
  gap: 20px;
  padding: 32px 0 56px;
}

.page-nav {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 10px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 24px rgba(20, 51, 95, 0.08);
}

.page-nav a {
  flex: 0 0 auto;
  min-height: 40px;
  padding: 8px 12px;
  color: var(--navy);
  background: var(--light-blue);
  border: 1px solid #b6d8f1;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.page-nav a:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.tool-card {
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  min-height: 64px;
  padding: 18px 22px;
  color: var(--navy);
  background: var(--white);
  border: 0;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  text-align: left;
}

.accordion-trigger:hover {
  background: var(--pale-blue);
}

.accordion-title {
  display: block;
  font-size: 1.2rem;
  font-weight: 800;
}

.accordion-help {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 500;
}

.accordion-icon {
  flex: 0 0 auto;
  font-size: 1.25rem;
  transition: transform 0.2s ease;
}

.accordion-trigger[aria-expanded="false"] .accordion-icon {
  transform: rotate(-90deg);
}

.accordion-panel {
  padding: 24px;
}

.accordion-panel[hidden] {
  display: none;
}

.toolbar,
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 22px;
}

.actions {
  margin-top: 24px;
  margin-bottom: 0;
}

.actions.compact {
  margin-top: 18px;
}

.backup-box {
  display: grid;
  gap: 14px;
  margin-bottom: 22px;
  padding: 16px;
  background: var(--pale-blue);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.backup-box h2 {
  margin-bottom: 4px;
  color: var(--navy);
  font-size: 1rem;
}

.backup-box p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.field {
  display: grid;
  gap: 7px;
  min-width: 0;
}

.field.wide {
  grid-column: 1 / -1;
}

label {
  color: var(--navy);
  font-size: 0.92rem;
  font-weight: 700;
}

.required-mark {
  color: var(--danger);
}

input,
select,
textarea {
  width: 100%;
  min-width: 0;
  min-height: 46px;
  padding: 12px 13px;
  color: var(--text);
  background: #fbfdff;
  border: 1px solid #b8ccdf;
  border-radius: 6px;
  outline: 2px solid transparent;
  outline-offset: 2px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, outline-color 0.2s ease;
}

textarea {
  resize: vertical;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible,
button:focus-visible {
  outline-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(246, 183, 60, 0.25);
}

input:focus,
select:focus,
textarea:focus {
  background: var(--white);
  border-color: var(--blue);
}

.field.is-invalid input,
.field.is-invalid select,
.field.is-invalid textarea {
  background: var(--danger-bg);
  border-color: var(--danger);
}

.field.is-autofilled input,
.field.is-autofilled textarea {
  animation: autofillPulse 1.6s ease;
}

.field.is-template-overridden input,
.field.is-template-overridden textarea {
  border-color: var(--success);
  box-shadow: inset 4px 0 0 rgba(23, 107, 69, 0.8);
}

.field-error,
.field-help {
  min-height: 20px;
  margin: 0;
  font-size: 0.84rem;
}

.field-error {
  color: var(--danger);
  font-weight: 700;
}

.field-help {
  color: var(--muted);
}

.primary-button,
.secondary-button,
.danger-button,
.copy-button,
.small-button {
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 700;
}

.primary-button {
  color: var(--white);
  background: var(--navy);
}

.primary-button:hover {
  background: #0f294e;
}

.secondary-button {
  color: var(--navy);
  background: var(--light-blue);
  border-color: #b6d8f1;
}

.secondary-button:hover {
  background: #dff0ff;
}

.danger-button {
  color: var(--white);
  background: var(--danger);
}

.danger-button:hover {
  background: #8f1c14;
}

.small-button {
  min-height: 38px;
  padding: 7px 12px;
  color: var(--navy);
  background: var(--white);
  border-color: #b6d8f1;
  font-size: 0.88rem;
}

.output-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.output-box {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdff;
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 14px 12px;
  background: var(--light-blue);
  border-bottom: 1px solid var(--line);
}

.output-header h3 {
  margin-bottom: 0;
  color: var(--navy);
  font-size: 0.98rem;
  line-height: 1.4;
}

.copy-button {
  flex: 0 0 auto;
  min-height: 38px;
  padding: 7px 12px;
  color: var(--navy);
  background: var(--white);
  border-color: #a9cce7;
  font-size: 0.88rem;
}

.copy-button.is-done,
.small-button.is-done,
.primary-button.is-done {
  color: var(--white);
  background: var(--success);
  border-color: var(--success);
}

pre {
  min-height: 260px;
  max-height: 460px;
  margin: 0;
  padding: 16px;
  overflow: auto;
  color: #102236;
  background: #ffffff;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.86rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.copy-status {
  min-height: 28px;
  margin: 0;
  padding: 0 14px 10px;
  color: var(--success);
  font-size: 0.88rem;
  font-weight: 700;
}

.master-list {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.master-item,
.quick-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 10px;
  align-items: center;
  padding: 12px;
  background: #fbfdff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.quick-list {
  display: grid;
  gap: 10px;
}

.quick-item {
  grid-template-columns: minmax(0, 1fr) auto;
}

.master-item strong,
.quick-item strong {
  display: block;
  color: var(--navy);
}

.master-item span,
.quick-item span {
  color: var(--muted);
  font-size: 0.9rem;
}

.master-item.is-row-highlighted,
.quick-item.is-row-highlighted {
  animation: rowPulse 1.6s ease;
}

.master-item.is-row-removing {
  background: var(--danger-bg);
  border-color: var(--danger);
  opacity: 0.45;
  transition: opacity 0.28s ease, background 0.28s ease, border-color 0.28s ease;
}

.empty-state {
  margin: 0;
  color: var(--muted);
}

.hidden {
  display: none;
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 10;
  max-width: min(360px, calc(100% - 32px));
  padding: 12px 16px;
  color: var(--white);
  background: var(--navy);
  border-radius: 8px;
  box-shadow: 0 12px 32px rgba(20, 51, 95, 0.24);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes autofillPulse {
  0% {
    background: #fff7d6;
    border-color: #c98705;
  }
  100% {
    background: #fbfdff;
    border-color: #b8ccdf;
  }
}

@keyframes rowPulse {
  0% {
    background: #e9f8ef;
    border-color: var(--success);
  }
  100% {
    background: #fbfdff;
    border-color: var(--line);
  }
}

@media (max-width: 820px) {
  .site-header {
    padding-top: 36px;
  }

  .accordion-panel {
    padding: 20px;
  }

  .form-grid,
  .output-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(100% - 20px, 1120px);
  }

  .site-header {
    padding: 30px 0 22px;
  }

  .layout {
    gap: 14px;
    padding-top: 20px;
  }

  .accordion-trigger {
    min-height: 60px;
    padding: 15px 16px;
  }

  .accordion-panel {
    padding: 16px;
  }

  .toolbar,
  .actions,
  .output-header {
    align-items: stretch;
    flex-direction: column;
  }

  .page-nav {
    margin-inline: -2px;
    padding: 8px;
  }

  .page-nav a {
    min-height: 44px;
  }

  .primary-button,
  .secondary-button,
  .danger-button,
  .copy-button,
  .small-button {
    width: 100%;
    min-height: 48px;
  }

  .master-item,
  .quick-item {
    grid-template-columns: 1fr;
  }

  pre {
    min-height: 220px;
    font-size: 0.82rem;
  }

  .toast {
    right: 10px;
    bottom: 10px;
  }
}