/* ============================================
   退職金・iDeCo 受取税金最適化シミュレーター
   style.css
   ============================================ */

/* CSS カスタムプロパティ */
:root {
  --primary: #7c3aed;
  --primary-hover: #6d28d9;
  --primary-light: #ede9fe;
  --primary-rgb: 124, 58, 237;
  --accent: #6d28d9;
  --accent-rgb: 109, 40, 217;
  --bg: #f9f7f4;
  --surface: #ffffff;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --text: #1a1a2e;
  --muted: #6b7280;
  --text-weak: #9ca3af;
  --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;
  --optimal-color: #6d28d9;
  --optimal-bg: #ede9fe;
}

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

html {
  scroll-behavior: smooth;
}

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

/* ============================================
   ヘッダー
   ============================================ */
header {
  background: linear-gradient(135deg, #4c1d95 0%, #5b21b6 60%, #6d28d9 100%);
  color: #fff;
  padding: 2rem 1.25rem 1.75rem;
  text-align: center;
}

.header-inner {
  max-width: 800px;
  margin: 0 auto;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.28);
  border-radius: 100px;
  padding: 0.25rem 0.85rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 0.75rem;
}

header h1 {
  font-family: 'Outfit', 'BIZ UDPGothic', sans-serif;
  font-size: clamp(1.2rem, 4vw, 1.75rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.subtitle {
  font-size: 0.875rem;
  opacity: 0.88;
  margin-top: 0.5rem;
}

/* ============================================
   メインコンテナ
   ============================================ */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.25rem;
}

/* ============================================
   広告ユニット
   ============================================ */
.ad-unit {
  min-height: 90px;
  background: #f0ede8;
  border: 1px dashed #d1cfc9;
  border-radius: var(--radius-sm);
  margin: 1.5rem 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 {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.04);
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.section-title i {
  font-size: 1.1rem;
  color: var(--primary);
}

.section-title h2 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

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

@media (min-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.form-group-card {
  background: #faf9ff;
  border: 1.5px solid #e9e4ff;
  border-radius: var(--radius-sm);
  padding: 1.25rem;
}

.form-group-header {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid #e9e4ff;
}

.form-group-header i {
  font-size: 1rem;
}

/* フィールド */
.field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 0.875rem;
}

.field:last-child {
  margin-bottom: 0;
}

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

.field-hint {
  font-size: 0.8125rem;
  color: var(--muted);
  min-height: 1.2em;
}

.input-with-unit {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.unit {
  font-size: 0.875rem;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}

input[type="number"],
select {
  flex: 1;
  min-width: 0;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.75rem;
  font-size: 0.9375rem;
  font-family: inherit;
  background: #fff;
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
  min-height: 44px;
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
}

select {
  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='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.25rem;
}

input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
}

/* スピナー非表示 */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  opacity: 0.6;
}

/* ============================================
   結果エリア
   ============================================ */
.result-section {
  margin-top: 1.25rem;
}

/* 最適バナー */
.optimal-banner {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: linear-gradient(135deg, #4c1d95 0%, #6d28d9 100%);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  color: #fff;
  box-shadow: 0 4px 16px rgba(var(--primary-rgb), 0.35);
  margin-bottom: 1.25rem;
}

.optimal-icon {
  font-size: 2rem;
  flex-shrink: 0;
  line-height: 1;
}

.optimal-icon i {
  color: #fbbf24;
}

.optimal-text {
  flex: 1;
  min-width: 0;
}

.optimal-label {
  font-size: 0.8rem;
  opacity: 0.85;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.optimal-pattern {
  font-size: clamp(1.1rem, 3vw, 1.35rem);
  font-weight: 700;
  margin-top: 0.15rem;
}

.optimal-saving {
  text-align: right;
  flex-shrink: 0;
  font-size: clamp(0.8rem, 2vw, 0.9rem);
  opacity: 0.9;
  max-width: 140px;
  line-height: 1.4;
}

/* グラフカード */
.chart-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.04);
  margin-bottom: 1.25rem;
}

.chart-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.chart-title i {
  color: var(--primary);
}

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

@media (min-width: 640px) {
  .chart-wrapper {
    height: 320px;
  }
}

/* 比較テーブルカード */
.table-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.04);
}

.table-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.table-title i {
  color: var(--primary);
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 1rem;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  min-width: 480px;
}

.comparison-table th,
.comparison-table td {
  padding: 0.65rem 0.85rem;
  text-align: right;
  border-bottom: 1px solid #f0ede8;
}

.comparison-table th {
  background: #f8f6ff;
  font-weight: 700;
  font-size: 0.8125rem;
  text-align: right;
  color: var(--text);
}

.comparison-table th:first-child,
.comparison-table td:first-child {
  text-align: left;
  color: var(--muted);
  font-size: 0.8125rem;
  white-space: nowrap;
}

.comparison-table tbody tr:hover {
  background: #faf9ff;
}

/* 最適パターンの列 */
.col-pattern.optimal {
  background: var(--primary-light) !important;
  color: var(--primary) !important;
  font-weight: 700;
}

.comparison-table td.optimal {
  color: var(--primary);
  font-weight: 700;
}

/* 合計手取り行 */
.row-total td {
  font-weight: 700;
  font-size: 0.9375rem;
  background: #faf6ff;
  border-top: 2px solid #e9e4ff;
}

.row-total td.optimal {
  color: var(--primary);
  font-size: 1rem;
}

/* 最適マーク */
.optimal-mark {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.1rem 0.45rem;
  border-radius: 100px;
  margin-top: 0.25rem;
}

/* 免責事項 */
.disclaimer-note {
  font-size: 0.8125rem;
  color: var(--muted);
  padding: 0.75rem 1rem;
  background: #f8f6f3;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--border);
  display: flex;
  gap: 0.4rem;
  align-items: flex-start;
  line-height: 1.6;
}

.disclaimer-note i {
  flex-shrink: 0;
  margin-top: 0.15rem;
  color: var(--muted);
}

/* ============================================
   使い方セクション
   ============================================ */
.howto-section {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.04);
  margin-top: 1.25rem;
}

.howto-main-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.howto-main-title i {
  color: var(--primary);
}

.howto-steps {
  padding-left: 1.5rem;
  margin-bottom: 1.75rem;
}

.howto-steps li {
  padding: 0.35rem 0;
  color: #374151;
  font-size: 0.9375rem;
}

.howto-steps li + li {
  margin-top: 0.25rem;
}

/* アコーディオン */
.accordion-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.accordion-item {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition);
}

.accordion-item[open] {
  border-color: #c4b5fd;
}

.accordion-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  user-select: none;
  min-height: 44px;
  gap: 0.5rem;
}

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

.accordion-summary span {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.accordion-summary span i {
  color: var(--primary);
  font-size: 0.95rem;
  flex-shrink: 0;
}

.accordion-icon {
  color: var(--muted);
  font-size: 0.85rem;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

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

.accordion-summary:hover {
  background: #faf9ff;
}

.accordion-body {
  padding: 1rem 1.125rem 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: #374151;
  line-height: 1.75;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.faq-item {
  background: #faf9ff;
  border-radius: 8px;
  padding: 0.875rem 1rem;
  border: 1px solid #e9e4ff;
}

.faq-q {
  font-weight: 700;
  color: var(--primary);
  font-size: 0.875rem;
  display: flex;
  align-items: flex-start;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
}

.faq-q i {
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.faq-a {
  font-size: 0.875rem;
  color: #374151;
  line-height: 1.7;
  padding-left: 1.3rem;
}

/* 情報テーブル（アコーディオン内） */
.info-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.info-table th,
.info-table td {
  padding: 0.55rem 0.85rem;
  border: 1px solid #e9e4ff;
  text-align: left;
}

.info-table th {
  background: #f0ebff;
  font-weight: 700;
  color: var(--primary);
}

.info-table tr:nth-child(even) td {
  background: #faf9ff;
}

/* 参照リンク */
.ref-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.ref-list li a {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.875rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: color var(--transition);
}

.ref-list li a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* ============================================
   フッター
   ============================================ */
footer {
  text-align: center;
  padding: 2rem 1.25rem;
  font-size: 0.875rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

.footer-inner {
  max-width: 900px;
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: var(--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);
}

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

/* ============================================
   デスクトップ対応
   ============================================ */
@media (min-width: 640px) {
  main {
    padding: 1.75rem 2rem;
  }

  .tool-section {
    padding: 2rem;
  }

  .chart-card,
  .table-card,
  .howto-section {
    padding: 2rem;
  }

  .optimal-banner {
    padding: 1.5rem 2rem;
  }
}

@media (min-width: 900px) {
  .form-group-card {
    padding: 1.5rem;
  }
}

/* アニメーション */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-section {
  animation: fadeInUp 0.3s ease;
}

/* ===== 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; }