.app-header {
  background: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: var(--transition);
}

.header__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header__logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.header__controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--color-accent-light);
  color: var(--color-accent);
  transition: var(--transition);
}

.lang-toggle:hover { background: var(--color-accent); color: white; }

.lang-toggle__current { color: var(--color-accent); }
.lang-toggle:hover .lang-toggle__current { color: white; }
.lang-toggle__other { opacity: 0.5; }
.lang-toggle:hover .lang-toggle__other { opacity: 0.8; }

.theme-toggle {
  font-size: 1.1rem;
  padding: 0.35rem;
  border-radius: 50%;
  transition: var(--transition);
}

.theme-toggle:hover { background: var(--color-accent-light); }

.hero {
  text-align: center;
  padding: 2rem 0;
}

.hero__icon {
  font-size: clamp(2.5rem, 8vw, 5rem);
  margin-bottom: 0.5rem;
}

.hero__title {
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-accent);
  line-height: 1.1;
}

.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  color: var(--color-text-muted);
  margin: 0.75rem 0 0.5rem;
  font-weight: 500;
}

.hero__desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.badge-strip {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border: 1px solid var(--color-border);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn:hover { transform: translateY(-2px); }

.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  box-shadow: var(--shadow-lg);
}

.btn--outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

.btn--full { width: 100%; }

.btn--lg { padding: 0.85rem 2.5rem; font-size: 1.1rem; }

.btn--sm { padding: 0.4rem 0.85rem; font-size: 0.8rem; }

.btn--icon {
  padding: 0.4rem 0.6rem;
  font-size: 1.2rem;
  border-radius: 50%;
}

.btn__icon { line-height: 1; }

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.form {
  max-width: 480px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form__label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  color: var(--color-text);
}

.form__input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-card);
  color: var(--color-text);
  font-size: 0.95rem;
  transition: var(--transition);
}

.form__input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.form__select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='currentColor' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

.form__checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
  cursor: pointer;
}

.form__checkbox-label input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-accent);
}

.form__hint {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.3rem;
  line-height: 1.5;
}

.toggle-group {
  display: flex;
  gap: 0.5rem;
}

.toggle-btn {
  flex: 1;
  padding: 0.6rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg-card);
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition);
}

.toggle-btn:hover { border-color: var(--color-accent); }

.toggle-btn--active {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.searchable-select { position: relative; }

.searchable-select__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  max-height: 200px;
  overflow-y: auto;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  z-index: 50;
  display: none;
}

.searchable-select__dropdown.open { display: block; }

.searchable-select__item {
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
}

.searchable-select__item:hover { background: var(--color-accent-light); color: var(--color-accent); }

.searchable-select__item--selected { background: var(--color-accent); color: white; }

.bench-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.bench-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.bench-card--selected {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.bench-card__checkbox {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 1.25rem;
  height: 1.25rem;
  accent-color: var(--color-accent);
}

.bench-card__title {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.25rem;
  padding-right: 1.5rem;
}

.bench-card__icon { font-size: 1.5rem; margin-bottom: 0.5rem; }

.bench-card__unit {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.notice {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.notice--warning {
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  color: var(--color-warning-text);
}

.notice__icon { font-size: 1.1rem; flex-shrink: 0; }

.results { text-align: center; }

.results__hero {
  padding: 1.5rem 0;
}

.results__emoji { font-size: clamp(2.5rem, 6vw, 4rem); }

.results__title {
  font-size: clamp(1.3rem, 3.5vw, 2rem);
  margin: 0.5rem 0 0.25rem;
  color: var(--color-accent);
}

.results__subtitle {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.results__charts {
  margin: 1.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.chart-container {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
}

.chart-container canvas { width: 100%; height: auto; border-radius: var(--radius-sm); }

.chart-title {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  text-align: left;
}

.results__cards { margin: 1.5rem 0; }

.result-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: left;
}

.result-card__label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-card__value {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0.25rem 0;
}

.result-card__derived {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: 0.25rem;
}

.result-card__status {
  font-weight: 600;
  margin: 0.35rem 0 0.25rem;
  font-size: 0.9rem;
}

.result-card__status--severely_low,
.result-card__status--severely_high { color: #dc2626; }

.result-card__status--low,
.result-card__status--high { color: #d97706; }

.result-card__status--optimal,
.result-card__status--slightly_low,
.result-card__status--slightly_high { color: #16a34a; }

.result-card__interpretation {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.results__inputs-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.share__heading { font-size: 1rem; margin-bottom: 0.75rem; }

.share__buttons {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.btn--share {
  flex-direction: column;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  font-size: 0.8rem;
  min-width: 85px;
}

.btn--share:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

.share__icon { font-size: 1.5rem; }

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal {
  background: var(--color-bg-card);
  border-radius: var(--radius);
  max-width: 560px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.modal__title { font-size: 1.15rem; }

.modal__close {
  font-size: 1.25rem;
  padding: 0.25rem;
  border-radius: 50%;
  transition: var(--transition);
}

.modal__close:hover { background: var(--color-accent-light); }

.modal__body { padding: 1.5rem; }

.methodology-content h4 {
  font-size: 1rem;
  margin: 1.25rem 0 0.5rem;
  color: var(--color-accent);
}

.methodology-content h4:first-child { margin-top: 0; }

.formula {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  padding: 0.75rem 1rem;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  text-align: center;
  margin-bottom: 0.75rem;
}

.methodology-content dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 0.75rem;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.methodology-content dt { font-weight: 700; font-family: var(--font-mono); }

.methodology-content dd { color: var(--color-text-muted); }

.methodology-content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.methodology-content ul { list-style: disc; padding-left: 1.25rem; }

.methodology-content li {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.3rem;
}

.app-footer {
  text-align: center;
  padding: 1.5rem 1rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-card);
}

.hidden { display: none !important; }