/* ============================================
   住宅ローン繰上返済シミュレーター — style.css
   ============================================ */

:root {
  --primary: #1e40af;
  --primary-hover: #1e3a8a;
  --primary-rgb: 30, 64, 175;
  --primary-light: #dbeafe;
  --accent: #2563eb;
  --accent-rgb: 37, 99, 235;
  --shortcut-color: #2563eb;
  --shortcut-bg: #eff6ff;
  --shortcut-border: #bfdbfe;
  --reduce-color: #059669;
  --reduce-bg: #f0fdf4;
  --reduce-border: #bbf7d0;
  --bg: #f9f7f4;
  --surface: #ffffff;
  --text: #1a1a2e;
  --text-muted: #6b7280;
  --text-weak: #9ca3af;
  --border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.10), 0 1px 4px rgba(0,0,0,0.06);
  --transition: 0.15s ease;
}

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

/* ========== ベース ========== */
html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Outfit', 'BIZ UDPGothic', -apple-system, BlinkMacSystemFont,
               "Hiragino Sans", "Noto Sans JP", sans-serif;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}

/* ========== ヘッダー ========== */
header {
  background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 60%, #2563eb 100%);
  color: #fff;
  padding: 1.75rem 1.25rem 1.5rem;
  text-align: center;
}

.header-inner {
  max-width: 860px;
  margin: 0 auto;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  margin-bottom: 0.75rem;
  letter-spacing: 0.01em;
}

header h1 {
  font-size: clamp(1.3rem, 4vw, 1.85rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.subtitle {
  font-size: 0.9rem;
  opacity: 0.88;
  margin-top: 0.5rem;
}

/* ========== メイン ========== */
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 1rem 1rem 2rem;
}

/* ========== カード ========== */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
}

/* ========== 広告ユニット ========== */
.ad-unit {
  min-height: 90px;
  background: #f1f5f9;
  border: 1.5px dashed #cbd5e1;
  border-radius: var(--radius-sm);
  margin: 1.25rem 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-weak);
  font-size: 0.75rem;
}

/* ========== 入力フォーム ========== */
.tool-section {
  margin-bottom: 0;
}

.tool-section h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.field-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: #374151;
}

.input-wrap {
  display: flex;
  align-items: center;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fff;
  transition: border-color var(--transition), box-shadow var(--transition);
  overflow: hidden;
}

.input-wrap:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
}

.input-wrap input {
  flex: 1;
  min-width: 0;
  border: none;
  outline: none;
  padding: 0.625rem 0.75rem;
  font-size: 1rem;
  font-family: inherit;
  color: var(--text);
  background: transparent;
  min-height: 44px;
}

.input-wrap input::-webkit-outer-spin-button,
.input-wrap input::-webkit-inner-spin-button {
  -webkit-appearance: none;
}

.input-wrap input[type=number] {
  -moz-appearance: textfield;
}

.input-suffix {
  padding: 0 0.75rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  background: #f8fafc;
  border-left: 1.5px solid var(--border);
  height: 100%;
  display: flex;
  align-items: center;
  white-space: nowrap;
  min-height: 44px;
}

.field-hint {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.error-msg {
  margin-top: 0.75rem;
  padding: 0.625rem 0.875rem;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius-sm);
  color: #dc2626;
  font-size: 0.875rem;
  display: none;
}

.error-msg.visible {
  display: block;
}

/* ========== 結果セクション ========== */
.result-section {
  margin-top: 1.5rem;
}

.section-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ---- おすすめバッジ ---- */
.recommend-badge {
  margin-bottom: 1rem;
  min-height: 0;
}

.recommend-badge.visible {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: linear-gradient(135deg, #1e3a8a, #2563eb);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  padding: 0.5rem 1rem;
  border-radius: 100px;
  box-shadow: 0 2px 8px rgba(37,99,235,0.35);
}

/* ---- 2列比較カード ---- */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 0;
}

.compare-card {
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  border: 1.5px solid transparent;
  transition: box-shadow var(--transition), transform var(--transition);
}

.compare-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.compare-card--shortcut {
  background: var(--shortcut-bg);
  border-color: var(--shortcut-border);
}

.compare-card--reduce {
  background: var(--reduce-bg);
  border-color: var(--reduce-border);
}

.compare-card__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1.5px solid;
}

.compare-card--shortcut .compare-card__header {
  color: var(--shortcut-color);
  border-color: var(--shortcut-border);
}

.compare-card--reduce .compare-card__header {
  color: var(--reduce-color);
  border-color: var(--reduce-border);
}

.compare-item {
  margin-bottom: 0.875rem;
}

.compare-item:last-child {
  margin-bottom: 0;
}

.compare-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.compare-value {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1.15;
}

.compare-value--sm {
  font-size: clamp(1.1rem, 3vw, 1.4rem);
}

.compare-card--shortcut .compare-value {
  color: var(--shortcut-color);
}

.compare-card--reduce .compare-value {
  color: var(--reduce-color);
}

.compare-stars {
  font-size: 1.25rem;
  line-height: 1.2;
}

/* ========== グラフ ========== */
.chart-card {
  margin-top: 1.25rem;
}

.chart-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chart-wrap {
  position: relative;
  height: 260px;
}

/* ========== 詳細比較表 ========== */
.table-card {
  margin-top: 1.25rem;
}

.table-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  white-space: nowrap;
}

.compare-table th,
.compare-table td {
  padding: 0.625rem 0.875rem;
  text-align: right;
  border-bottom: 1px solid var(--border);
}

.compare-table thead th {
  background: #f8fafc;
  font-weight: 700;
  color: var(--text-muted);
  font-size: 0.8125rem;
  text-align: center;
}

.compare-table thead th:first-child {
  text-align: left;
}

.compare-table tbody th {
  text-align: left;
  font-weight: 600;
  color: var(--text);
  background: #fafafa;
}

.compare-table tbody tr:last-child th,
.compare-table tbody tr:last-child td {
  border-bottom: none;
}

.compare-table .cell-same {
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
}

.disclaimer-note {
  margin-top: 0.875rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: 0.35rem;
  line-height: 1.6;
}

/* ========== 使い方セクション ========== */
.howto-section {
  margin-top: 1.5rem;
}

.howto-section h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.howto-steps {
  list-style: none;
  counter-reset: step;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  margin-bottom: 1.25rem;
  padding: 0;
}

.howto-steps li {
  counter-increment: step;
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  font-size: 0.9375rem;
}

.howto-steps li::before {
  content: counter(step);
  flex-shrink: 0;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.125rem;
}

/* ========== アコーディオン ========== */
.accordion-list {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.accordion {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--surface);
}

.accordion[open] {
  border-color: var(--primary);
}

.accordion-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  min-height: 44px;
  transition: background var(--transition);
  user-select: none;
}

.accordion-summary::-webkit-details-marker {
  display: none;
}

.accordion-summary:hover {
  background: #f8fafc;
}

.accordion[open] .accordion-summary {
  background: var(--primary-light);
  color: var(--primary);
  border-bottom: 1px solid #bfdbfe;
}

.accordion-icon {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.accordion[open] .accordion-icon {
  transform: rotate(180deg);
}

.accordion-body {
  padding: 1rem;
  font-size: 0.9rem;
  color: #374151;
  line-height: 1.75;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.faq-item dt {
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.faq-item dd {
  color: #374151;
  padding-left: 0.75rem;
  border-left: 3px solid var(--primary-light);
}

/* ========== フッター ========== */
footer {
  text-align: center;
  padding: 2rem 1.25rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.footer-links a:hover {
  color: var(--primary);
  text-decoration: underline;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-weak);
}

/* ========== レスポンシブ ========== */
@media (max-width: 520px) {
  .form-grid {
    grid-template-columns: 1fr;
  }

  .compare-grid {
    grid-template-columns: 1fr;
  }

  .compare-value {
    font-size: 1.5rem;
  }

  .chart-wrap {
    height: 220px;
  }

  .compare-table {
    font-size: 0.8125rem;
  }

  .compare-table th,
  .compare-table td {
    padding: 0.5rem 0.625rem;
  }
}

@media (min-width: 640px) {
  main {
    padding: 1.5rem 1.5rem 2.5rem;
  }

  .card {
    padding: 1.75rem;
  }

  .chart-wrap {
    height: 300px;
  }
}

@media (min-width: 900px) {
  main {
    padding: 2rem 1.25rem 3rem;
  }
}

/* ===== プライバシーノート ===== */
.privacy-note {
  font-size: 0.8rem;
  color: #4b5563;
  background: #f0fdf4;
  border-left: 3px solid #86efac;
  padding: 0.5rem 0.875rem;
  border-radius: 0 6px 6px 0;
  margin-bottom: 1.25rem;
  line-height: 1.6;
}
.privacy-note .bi { margin-right: 0.3em; color: #16a34a; }