/* =============================================================================
   生命保険 必要保障額計算ツール — style.css
   デザインシステム: ネイビー系 (計算・金融ジャンル応用)
   ============================================================================= */

:root {
  --primary: #1a3a5c;
  --primary-hover: #142e4a;
  --primary-light: #2a5080;
  --primary-rgb: 26, 58, 92;
  --accent: #1d6fa4;
  --accent-hover: #185e8b;

  --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;

  /* 内訳カラー */
  --color-living:    #2563eb;
  --color-housing:   #7c3aed;
  --color-education: #059669;
  --color-emergency: #d97706;
  --color-deduction: #6b7280;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'BIZ UDPGothic', 'Hiragino Sans', 'Noto Sans JP', 'Yu Gothic Medium', sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

/* ============================================================
   ヘッダー
   ============================================================ */
header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  padding: 2rem 1.25rem 1.75rem;
  text-align: center;
}

.header-inner {
  max-width: 720px;
  margin: 0 auto;
}

.header-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  opacity: 0.92;
}

header h1 {
  font-family: 'Outfit', 'BIZ UDPGothic', sans-serif;
  font-size: clamp(1.3rem, 4vw, 1.9rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.3;
}

.subtitle {
  font-size: 0.9rem;
  opacity: 0.88;
  margin-top: 0.5rem;
  line-height: 1.5;
}

/* ============================================================
   メインレイアウト
   ============================================================ */
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 1.25rem 1rem 2rem;
}

/* ============================================================
   広告ユニット
   ============================================================ */
.ad-unit {
  min-height: 0;
  margin: 1.5rem 0;
}

/* ============================================================
   プライバシー通知
   ============================================================ */
.privacy-notice {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  color: #1e40af;
  margin-bottom: 1.25rem;
}

.privacy-notice i {
  flex-shrink: 0;
  font-size: 1rem;
}

/* ============================================================
   ツールセクション
   ============================================================ */
.tool-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ============================================================
   入力カード
   ============================================================ */
.input-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  transition: box-shadow var(--transition), transform var(--transition);
}

.input-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 2px solid #e8f0f8;
  padding-bottom: 0.6rem;
}

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

/* ============================================================
   フォームフィールド
   ============================================================ */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

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

.input-suffix-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.input-suffix-wrap input {
  flex: 1;
}

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

input[type="number"],
input[type="text"],
select {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
  min-height: 44px;
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
}

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

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%236b7280' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.25rem;
}

/* ============================================================
   ボタン
   ============================================================ */
.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.875rem 1.5rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition), transform 0.12s ease, box-shadow var(--transition);
  min-height: 52px;
  margin-top: 0.5rem;
  box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.30);
  letter-spacing: 0.02em;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(var(--primary-rgb), 0.35);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 1px 4px rgba(var(--primary-rgb), 0.20);
}

/* ============================================================
   結果セクション
   ============================================================ */
.result-section {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  margin-top: 1.25rem;
  overflow: hidden;
}

.result-main {
  background: linear-gradient(135deg, #1a3a5c 0%, #2a5080 100%);
  color: #fff;
  text-align: center;
  padding: 2rem 1.5rem;
}

.result-label {
  font-size: 0.9rem;
  opacity: 0.85;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.result-value {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.result-sub {
  font-size: 1.1rem;
  opacity: 0.8;
  margin-top: 0.25rem;
}

.result-note {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  background: #fffbeb;
  border-bottom: 1px solid #fde68a;
  padding: 0.875rem 1.25rem;
  font-size: 0.875rem;
  color: #92400e;
  line-height: 1.6;
}

.result-note i {
  flex-shrink: 0;
  margin-top: 0.1rem;
  font-size: 1rem;
}

/* ============================================================
   内訳セクション
   ============================================================ */
.breakdown-section {
  padding: 1.5rem 1.25rem;
}

.breakdown-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 1rem;
}

.breakdown-grid {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.breakdown-item {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.75rem 1rem;
  background: #f8fafc;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.breakdown-item.deduction {
  background: #f9fafb;
  border-color: #d1d5db;
}

.bd-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.bd-icon.living    { background: #dbeafe; color: var(--color-living); }
.bd-icon.housing   { background: #ede9fe; color: var(--color-housing); }
.bd-icon.education { background: #d1fae5; color: var(--color-education); }
.bd-icon.emergency { background: #fef3c7; color: var(--color-emergency); }
.bd-icon.deduction { background: #f3f4f6; color: var(--color-deduction); }

.bd-info {
  flex: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.bd-name {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.bd-value {
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.breakdown-item.deduction .bd-value {
  color: var(--color-deduction);
}

/* ============================================================
   チャート
   ============================================================ */
.chart-wrap {
  max-width: 280px;
  margin: 0 auto;
}

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

.howto-section > h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #e8f0f8;
}

/* アコーディオン */
.howto-details,
.faq-item {
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.howto-details summary,
.faq-item summary {
  padding: 1rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  user-select: none;
  transition: background var(--transition);
  min-height: 44px;
}

.howto-details summary::before,
.faq-item summary::before {
  content: '\F285';
  font-family: 'bootstrap-icons';
  font-size: 0.875rem;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.howto-details[open] summary::before,
.faq-item[open] summary::before {
  transform: rotate(90deg);
}

.howto-details summary:hover,
.faq-item summary:hover {
  background: #f0f6ff;
}

.howto-details summary::-webkit-details-marker { display: none; }
.faq-item summary::-webkit-details-marker { display: none; }

/* 使い方ステップ */
.howto-steps {
  list-style: none;
  padding: 0 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.howto-steps li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  min-width: 28px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  font-size: 0.8125rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.howto-steps li strong {
  font-size: 0.9375rem;
  display: block;
  margin-bottom: 0.25rem;
  color: var(--text);
}

.howto-steps li p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* FAQ アコーディオン */
.faq-section {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.faq-section > h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #e8f0f8;
  margin-bottom: 0.25rem;
}

.faq-item p {
  padding: 0 1.25rem 1.25rem;
  font-size: 0.9rem;
  color: #4b5563;
  line-height: 1.75;
  border-top: 1px solid var(--border);
}

/* 説明セクション */
.info-section {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  display: flex;
  flex-direction: column;
  gap: 0;
}

.info-section h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.info-section h2:first-child {
  margin-top: 0;
}

.info-section p {
  font-size: 0.9rem;
  color: #4b5563;
  line-height: 1.8;
}

/* ============================================================
   フッター
   ============================================================ */
footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.85rem;
  color: var(--text-weak);
  border-top: 1px solid var(--border);
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

footer a:hover {
  color: var(--primary);
}

.footer-desc {
  font-size: 0.8rem;
  color: var(--text-weak);
}

/* ============================================================
   レスポンシブ: タブレット以上
   ============================================================ */
@media (min-width: 640px) {
  main {
    padding: 1.75rem 1.5rem 3rem;
  }

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

  .input-card {
    padding: 1.5rem;
  }

  .chart-wrap {
    max-width: 320px;
  }

  header {
    padding: 2.5rem 1.5rem 2rem;
  }
}

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

  .breakdown-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .breakdown-item.deduction {
    grid-column: 1 / -1;
  }

  .chart-wrap {
    max-width: 340px;
    margin-top: 0.5rem;
  }
}