/* ===== Design Tokens ===== */
:root {
  --color-primary: #00793d;
  --color-primary-light: #d1f0e0;
  --color-primary-dark: #005a2e;
  --color-secondary: #4a6354;
  --color-bg: #f4f8f5;
  --color-surface: #ffffff;
  --color-on-surface: #1a1c19;
  --color-on-surface-muted: #5a6b5f;
  --color-border: #c8ddd0;
  --color-shadow: rgba(0, 121, 61, 0.12);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition: 0.2s ease;
  --font-main: 'Noto Sans JP', sans-serif;
  --font-heading: 'Noto Serif JP', serif;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ===== Base ===== */
body {
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-on-surface);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  word-break: break-word;
}

/* ===== Header ===== */
header#appTitle {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, #00a855 100%);
  color: #fff;
  padding: 1.4rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.5rem, 5vw, 2rem);
  text-align: center;
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 4px 18px rgba(0,0,0,0.18);
}

.header-icon {
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  line-height: 1;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.18);
}

/* ===== Main ===== */
main {
  flex: 1;
  width: 100%;
  max-width: 960px;
  margin: 2rem auto;
  padding: 0 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* ===== Section Labels ===== */
.section-label {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 0.7rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  letter-spacing: 0.03em;
}

.hint {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-on-surface-muted);
  font-family: var(--font-main);
  letter-spacing: 0;
}

/* English sub-label */
.label-en {
  display: block;
  font-size: 0.68rem;
  font-weight: 400;
  font-family: var(--font-main);
  color: var(--color-on-surface-muted);
  letter-spacing: 0.02em;
  margin-top: 1px;
  line-height: 1.2;
}

/* ===== Textarea ===== */
.textarea-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

textarea#textInput {
  width: 100%;
  min-height: 180px;
  padding: 1.1rem 1.2rem;
  font-family: var(--font-main);
  font-size: 1.05rem;
  line-height: 1.75;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-on-surface);
  resize: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  box-shadow: 0 2px 10px var(--color-shadow);
}

textarea#textInput:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(0,121,61,0.12), 0 2px 10px var(--color-shadow);
}

textarea#textInput::placeholder {
  color: #b0bfb6;
}

.textarea-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
}

/* ===== Buttons ===== */
.btn {
  padding: 0.55rem 1.2rem;
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.btn-clear {
  background: #fff0f0;
  color: #c0392b;
  border: 1.5px solid #f5c6c2;
}
.btn-clear:hover {
  background: #c0392b;
  color: #fff;
  border-color: #c0392b;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(192,57,43,0.2);
}

.btn-paste {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border: 1.5px solid var(--color-primary);
}
.btn-paste:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,121,61,0.25);
}

/* ===== Stats Grid ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

/* ===== Stat Card ===== */
.stat-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.2rem;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px var(--color-shadow);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--color-primary);
  border-radius: 4px 0 0 4px;
  opacity: 0.6;
  transition: opacity var(--transition), width var(--transition);
}

.stat-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 6px 22px rgba(0,121,61,0.2);
  transform: translateY(-3px);
}

.stat-card:hover::before {
  width: 6px;
  opacity: 1;
}

.stat-card:active {
  transform: scale(0.97);
}

.stat-card-wide {
  grid-column: span 2;
}

@media (max-width: 500px) {
  .stat-card-wide { grid-column: span 1; }
}

.stat-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-secondary);
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.1;
  letter-spacing: -0.02em;
  transition: color var(--transition), transform var(--transition);
}

.stat-card:hover .stat-value {
  color: var(--color-primary);
}

.stat-breakdown {
  font-size: 1rem;
  color: var(--color-on-surface-muted);
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.stat-value-inline {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.copy-badge {
  position: absolute;
  top: 0.5rem;
  right: 0.6rem;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: 4px;
  padding: 2px 6px;
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
  letter-spacing: 0.02em;
}

.stat-card:hover .copy-badge {
  opacity: 1;
}

/* Copied flash */
.stat-card.copied .stat-value,
.stat-card.copied .stat-value-inline {
  color: var(--color-primary);
  animation: flash 0.4s ease;
}

@keyframes flash {
  0% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* ===== Customize Panel ===== */
.section-label.collapsible {
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
  padding: 0.85rem 1.1rem;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1.5px solid var(--color-border);
  transition: all var(--transition);
  box-shadow: 0 2px 8px var(--color-shadow);
  margin-bottom: 0;
}

.section-label.collapsible:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 14px rgba(0,121,61,0.15);
}

.section-label.collapsible[aria-expanded="true"] {
  border-color: var(--color-primary);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
  border-bottom-color: transparent;
}

.collapse-icon {
  display: inline-block;
  transition: transform 0.2s ease;
  font-size: 0.75em;
  color: var(--color-primary);
}

.section-label.collapsible[aria-expanded="true"] .collapse-icon {
  transform: rotate(90deg);
}

.customize-panel {
  background: var(--color-surface);
  border: 1.5px solid var(--color-primary);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  padding: 1.2rem 1.4rem;
  box-shadow: 0 6px 20px rgba(0,121,61,0.12);
  animation: slideDown 0.2s ease;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.customize-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.7rem;
  margin-bottom: 1rem;
}

.custom-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--color-on-surface);
  cursor: pointer;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.custom-option:hover {
  background: var(--color-primary-light);
}

.custom-option input[type="checkbox"] {
  accent-color: var(--color-primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.custom-extra {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
  margin-bottom: 0.6rem;
}

.custom-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-secondary);
  white-space: nowrap;
}

.custom-text-input {
  flex: 1;
  min-width: 150px;
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  font-family: var(--font-main);
  font-size: 0.9rem;
  transition: border-color var(--transition);
  outline: none;
}

.custom-text-input:focus {
  border-color: var(--color-primary);
}

.custom-note {
  font-size: 0.78rem;
  color: var(--color-on-surface-muted);
  padding-top: 0.4rem;
  border-top: 1px solid var(--color-border);
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-primary-dark);
  color: #fff;
  padding: 0.75rem 1.6rem;
  border-radius: 2rem;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 6px 24px rgba(0,0,0,0.25);
  opacity: 0;
  transition: all 0.3s cubic-bezier(.4,0,.2,1);
  pointer-events: none;
  z-index: 9999;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== Footer ===== */
footer#footer {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-secondary);
  padding: 1.5rem 1rem 2.5rem;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

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

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

/* ===== Responsive ===== */
@media (max-width: 640px) {
  main {
    margin: 1.2rem auto;
    gap: 1.4rem;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat-value { font-size: 1.8rem; }

  .textarea-actions {
    justify-content: stretch;
  }

  .textarea-actions .btn {
    flex: 1;
    justify-content: center;
  }
}

/* ===== Custom Scrollbar ===== */

/* Chrome / Edge / Safari */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
  border-radius: 999px;
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: 999px;
  border: 2px solid var(--color-bg);
  transition: background var(--transition);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dark);
}

::-webkit-scrollbar-corner {
  background: var(--color-bg);
}

/* Firefox (progressive enhancement) */
@supports (scrollbar-width: thin) {
  * {
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) var(--color-bg);
  }
}