/* ============================================
   AI住民税ラボ - style.css (v2.0 令和8年度対応版)
   ============================================ */

:root {
  --color-bg: #F4F6F5;
  --color-surface: #FFFFFF;
  --color-surface-sunken: #EEF1F0;
  --color-text-primary: #14181A;
  --color-text-secondary: #5B6560;
  --color-text-muted: #8B948F;
  --color-border: #DDE3E0;
  --color-accent: #0F6E56;
  --color-accent-dark: #0A4E3D;
  --color-accent-bg: #E4F1EC;
  --color-indigo: #2B3A67;
  --color-error: #B3261E;
  --color-error-bg: #FBEAE9;
  --color-notice-bg: #FFF7E0;
  --color-notice-text: #7A5B00;
  --font-sans: "Hiragino Sans", "Noto Sans JP", "Yu Gothic", system-ui, -apple-system, sans-serif;
  --font-num: "Roboto Mono", "SF Mono", "Hiragino Sans", monospace;
  --radius-card: 16px;
  --radius-control: 10px;
  --max-width: 480px;
}

* { box-sizing: border-box; }

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

html, body { margin: 0; padding: 0; }

body {
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.header { background: var(--color-surface); border-bottom: 1px solid var(--color-border); }
.header__inner { max-width: var(--max-width); margin: 0 auto; padding: 20px 20px 18px; display: flex; align-items: center; gap: 12px; }
.header__mark {
  flex-shrink: 0; width: 40px; height: 40px; border-radius: 10px; background: var(--color-indigo);
  color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 500; font-size: 16px;
}
.header__brand { margin: 0; font-size: 11px; letter-spacing: 0.04em; color: var(--color-text-muted); }
.header__title { margin: 2px 0 0; font-size: 19px; font-weight: 500; color: var(--color-text-primary); }

.main { max-width: var(--max-width); margin: 0 auto; padding: 20px 16px 40px; display: flex; flex-direction: column; gap: 16px; }

.breadcrumb { padding: 0 4px; }
.breadcrumb__list { display: flex; flex-wrap: wrap; gap: 4px; margin: 0; padding: 0; list-style: none; font-size: 12px; color: var(--color-text-muted); }
.breadcrumb__item::after { content: "›"; margin-left: 6px; }
.breadcrumb__item:last-child::after { content: ""; }
.breadcrumb__item a { color: var(--color-accent); text-decoration: underline; }
.breadcrumb__item[aria-current="page"] { color: var(--color-text-secondary); }

.card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 24px 20px; }
.card__lead { margin: 0 0 20px; font-size: 13px; color: var(--color-text-secondary); text-align: center; }
.section-heading { margin: 0 0 4px; font-size: 15px; font-weight: 500; color: var(--color-text-primary); text-align: center; }
.section-subheading { margin: 0 0 8px; font-size: 12px; font-weight: 500; color: var(--color-text-secondary); }

.field { margin-bottom: 16px; }
label { display: block; font-size: 12px; color: var(--color-text-secondary); margin-bottom: 6px; }
input {
  width: 100%; height: 46px; padding: 0 14px; font-size: 16px; font-family: var(--font-num);
  color: var(--color-text-primary); background: var(--color-surface-sunken);
  border: 1px solid var(--color-border); border-radius: var(--radius-control); appearance: none;
}
input:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px var(--color-accent-bg); }
.field-note { margin: 8px 0 0; font-size: 11px; color: var(--color-text-muted); line-height: 1.6; }

.field--checkbox { display: flex; flex-direction: column; }
.checkbox-label { display: flex; align-items: flex-start; gap: 8px; font-size: 13px; color: var(--color-text-primary); }
.checkbox-label input[type="checkbox"] { width: auto; height: auto; margin-top: 2px; }

.btn-toggle {
  width: 100%; background: var(--color-surface-sunken); border: 1px dashed var(--color-border);
  border-radius: var(--radius-control); padding: 12px; font-size: 13px; color: var(--color-accent);
  font-family: var(--font-sans); cursor: pointer; margin-bottom: 16px;
}
.detail-fields { border-top: 1px dashed var(--color-border); padding-top: 16px; margin-bottom: 4px; }

.form-error {
  margin: 0 0 16px; padding: 12px 14px; background: var(--color-error-bg); color: var(--color-error);
  border: 1px solid var(--color-error); border-radius: var(--radius-control); font-size: 13px; line-height: 1.6;
}
.field.field--invalid input { border-color: var(--color-error); background: var(--color-error-bg); }

.btn-primary {
  width: 100%; height: 50px; margin-top: 4px; background: var(--color-accent); color: #fff; border: none;
  border-radius: var(--radius-control); font-size: 15px; font-weight: 500; font-family: var(--font-sans); cursor: pointer;
}
.btn-primary:active { background: var(--color-accent-dark); }
.btn-secondary {
  width: 100%; height: 46px; margin-top: 20px; background: transparent; color: var(--color-text-primary);
  border: 1px solid var(--color-border); border-radius: var(--radius-control); font-size: 14px; font-family: var(--font-sans); cursor: pointer;
}
.btn-secondary:active { background: var(--color-surface-sunken); }

.result-headline { text-align: center; padding-bottom: 20px; border-bottom: 1px solid var(--color-border); margin-bottom: 20px; }
.result-headline__label { margin: 0; font-size: 12px; color: var(--color-text-secondary); }
.result-headline__value { margin: 6px 0 0; font-family: var(--font-num); font-size: 36px; font-weight: 500; color: var(--color-accent); font-variant-numeric: tabular-nums; }
.result-headline__value .unit { font-size: 16px; font-family: var(--font-sans); color: var(--color-text-secondary); margin-left: 4px; }
.result-headline__sub { margin: 6px 0 0; font-size: 12px; color: var(--color-text-muted); }

.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 20px; }
.stat-card { background: var(--color-surface-sunken); border-radius: var(--radius-control); padding: 12px; text-align: center; }
.stat-card__label { margin: 0; font-size: 11px; color: var(--color-text-muted); }
.stat-card__value { margin: 4px 0 0; font-family: var(--font-num); font-size: 18px; font-weight: 500; font-variant-numeric: tabular-nums; }
.stat-card__value .unit-sm { font-size: 11px; font-family: var(--font-sans); color: var(--color-text-muted); margin-left: 2px; }

.highlight-block { background: var(--color-accent-bg); border-radius: var(--radius-control); padding: 16px; text-align: center; margin-bottom: 16px; }
.highlight-block__label { margin: 0; font-size: 12px; color: var(--color-accent-dark); }
.highlight-block__value { margin: 6px 0 0; font-family: var(--font-num); font-size: 26px; font-weight: 500; color: var(--color-accent-dark); font-variant-numeric: tabular-nums; }
.highlight-block__value .unit-sm { font-size: 13px; font-family: var(--font-sans); color: var(--color-accent-dark); margin-left: 2px; }
.highlight-block__sub { margin: 4px 0 0; font-size: 11px; color: var(--color-accent-dark); opacity: 0.8; }

.notice-block {
  background: var(--color-notice-bg); border: 1px solid #F0DDA0; border-radius: var(--radius-control);
  padding: 12px 14px; margin-bottom: 16px;
}
.notice-block p { margin: 0; font-size: 12px; line-height: 1.7; color: var(--color-notice-text); }

.detail-list { border-top: 1px solid var(--color-border); padding-top: 10px; margin-bottom: 4px; }
.detail-row { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; font-size: 13px; border-bottom: 1px solid var(--color-border); }
.detail-row:last-child { border-bottom: none; }
.detail-row__label { color: var(--color-text-secondary); }
.detail-row__value { font-family: var(--font-num); font-variant-numeric: tabular-nums; }

.ai-comment { background: var(--color-accent-bg); border-radius: var(--radius-control); padding: 12px 14px; margin-top: 4px; }
.ai-comment__label { margin: 0 0 4px; font-size: 11px; font-weight: 500; color: var(--color-accent-dark); }
.ai-comment__text { margin: 0; font-size: 13px; line-height: 1.6; color: var(--color-accent-dark); }

.disclaimer { margin: 16px 0 0; font-size: 11px; line-height: 1.7; color: var(--color-text-muted); text-align: left; }
.footer { max-width: var(--max-width); margin: 0 auto; padding: 20px 20px 32px; text-align: center; font-size: 11px; color: var(--color-text-muted); }
.footer-links { display: flex; justify-content: center; gap: 16px; margin-bottom: 10px; }
.link-button { font-size: 12px; color: var(--color-accent); text-decoration: underline; }
.footer__back { margin: 0 0 10px; }
.back-link { font-size: 12px; color: var(--color-accent); text-decoration: underline; }

.card--info { text-align: left; }
.card--info .section-heading { text-align: left; margin-bottom: 14px; }
.info-block { margin-bottom: 16px; }
.info-block:last-child { margin-bottom: 0; }
.info-block__heading { margin: 0 0 4px; font-size: 13px; font-weight: 500; color: var(--color-text-primary); }
.info-block__text { margin: 0; font-size: 13px; line-height: 1.8; color: var(--color-text-secondary); }
.assumptions-list { margin: 0; padding-left: 18px; list-style: disc; }
.assumptions-list__item { font-size: 13px; line-height: 1.8; color: var(--color-text-secondary); margin-bottom: 10px; }
.assumptions-list__item:last-child { margin-bottom: 0; }
.assumptions-list__item strong { color: var(--color-text-primary); font-weight: 600; }

.card--related .section-heading { text-align: left; margin-bottom: 14px; }
.related-tool-list { display: flex; flex-direction: column; gap: 10px; }
.related-tool-card { display: flex; align-items: center; gap: 12px; background: var(--color-surface-sunken); border: 1px solid var(--color-border); border-radius: var(--radius-control); padding: 14px; color: inherit; text-decoration: none; }
.related-tool-card__icon { flex-shrink: 0; width: 36px; height: 36px; border-radius: 9px; background: var(--color-indigo); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 500; }
.related-tool-card__body { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.related-tool-card__name { font-size: 14px; font-weight: 500; color: var(--color-text-primary); }
.related-tool-card__desc { font-size: 12px; color: var(--color-text-secondary); margin-top: 2px; }
.related-tool-card__cta { flex-shrink: 0; font-size: 12px; font-weight: 500; color: var(--color-accent); white-space: nowrap; }