/* ===================================================
   老後の年金受取額シミュレーター — スタイルシート
   カラー: パープル系（#5b21b6 メイン）
   =================================================== */

:root {
  --primary: #5b21b6;
  --primary-hover: #4c1d95;
  --primary-light: #7c3aed;
  --primary-rgb: 91, 33, 182;
  --accent: #8b5cf6;
  --accent-rgb: 139, 92, 246;
  --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;

  /* Income/Expense colors */
  --income-color: #5b21b6;
  --expense-color: #ea580c;
  --surplus-color: #059669;
  --deficit-color: #dc2626;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

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

/* ===== Header ===== */
header {
  background: linear-gradient(135deg, var(--primary) 0%, #4c1d95 60%, #3b0764 100%);
  color: #fff;
  padding: 2rem 1.25rem 1.75rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

header::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 300px;
  height: 300px;
  background: rgba(255,255,255,0.04);
  border-radius: 50%;
  pointer-events: none;
}

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

.site-logo {
  display: inline-block;
  font-family: 'Outfit', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

header h1 {
  font-family: 'BIZ UDPGothic', sans-serif;
  font-size: clamp(1.3rem, 4vw, 1.9rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.01em;
}

header h1 .bi {
  font-size: 0.9em;
  margin-right: 0.3em;
  opacity: 0.9;
}

.subtitle {
  font-size: 0.875rem;
  opacity: 0.85;
  margin-top: 0.6rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Main ===== */
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

/* ===== Ad Unit ===== */
.ad-unit {
  min-height: 0;
  margin: 1.5rem 0;
}

/* ===== Privacy Notice ===== */
.privacy-notice {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-sm);
  padding: 0.6rem 1rem;
  font-size: 0.8125rem;
  color: #166534;
  margin-bottom: 1.5rem;
}

.privacy-notice .bi {
  font-size: 1rem;
  flex-shrink: 0;
  color: #16a34a;
}

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

.card:hover {
  box-shadow: var(--shadow-hover);
}

.form-card {
  margin-bottom: 1.5rem;
}

/* ===== Section Title ===== */
.section-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-title .bi {
  color: var(--primary);
}

/* ===== Toggle Group ===== */
.toggle-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.toggle-btn {
  flex: 1;
  min-width: 140px;
  min-height: 48px;
  padding: 0.625rem 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

.toggle-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: #f5f3ff;
}

.toggle-btn.active {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.35);
}

.toggle-btn:active {
  transform: scale(0.98);
}

/* ===== Form Grid ===== */
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 1.25rem;
}

/* ===== Field ===== */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-size: 0.875rem;
  font-weight: 700;
  color: #374151;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

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

/* ===== Input with Unit ===== */
.input-with-unit {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.input-with-unit input {
  flex: 1;
}

.unit {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 600;
  white-space: nowrap;
  min-width: 2.5rem;
}

/* ===== Input / Select ===== */
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%;
  -webkit-appearance: none;
  appearance: none;
}

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

input[type="number"]:hover,
select:hover {
  border-color: var(--accent);
}

/* ===== Range Slider ===== */
.slider-field {
  margin-top: 0.75rem;
}

.slider-value {
  font-family: 'Outfit', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.age-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.6rem;
  border-radius: 100px;
  background: #ede9fe;
  color: var(--primary);
  margin-left: 0.4rem;
  vertical-align: middle;
}

.age-badge.earlyup { background: #fef9c3; color: #854d0e; }
.age-badge.lateup  { background: #dcfce7; color: #166534; }

.slider-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.slider-min,
.slider-max {
  font-size: 0.8125rem;
  color: var(--text-muted);
  white-space: nowrap;
}

input[type="range"] {
  flex: 1;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: linear-gradient(to right, var(--primary) 0%, var(--primary) 33.3%, var(--border) 33.3%, var(--border) 100%);
  border-radius: 100px;
  cursor: pointer;
  min-height: 20px;
  padding: 0;
  border: none;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid #fff;
  box-shadow: 0 1px 6px rgba(var(--primary-rgb), 0.4);
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 2px 10px rgba(var(--primary-rgb), 0.5);
}

input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid #fff;
  box-shadow: 0 1px 6px rgba(var(--primary-rgb), 0.4);
  cursor: pointer;
}

input[type="range"]:focus {
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.18);
  border-radius: 100px;
}

.age-markers {
  display: flex;
  justify-content: space-between;
  padding: 0 0.25rem;
  font-size: 0.75rem;
  color: var(--text-weak);
  margin-top: 0.25rem;
}

/* ===== Calc Button ===== */
.calc-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  min-height: 52px;
  margin-top: 1.75rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: background var(--transition), transform 0.12s ease, box-shadow var(--transition);
  box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.35);
  letter-spacing: 0.02em;
}

.calc-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(var(--primary-rgb), 0.40);
}

.calc-btn:active {
  transform: translateY(0);
  box-shadow: 0 1px 4px rgba(var(--primary-rgb), 0.25);
}

/* ===== Hidden ===== */
.hidden {
  display: none !important;
}

/* ===== Result Section ===== */
.result-section {
  margin-bottom: 1.5rem;
}

/* ===== Result Headline ===== */
.result-headline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.result-main-card {
  background: linear-gradient(135deg, #5b21b6 0%, #4c1d95 100%);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  color: #fff;
  box-shadow: 0 4px 20px rgba(91, 33, 182, 0.35);
}

.result-badge {
  display: inline-block;
  background: rgba(255,255,255,0.2);
  border-radius: 100px;
  padding: 0.25rem 0.9rem;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
}

.result-value {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.result-unit {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-top: 0.4rem;
}

/* ===== Result Sub Grid ===== */
.result-sub-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.result-sub-card {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 1rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  text-align: center;
}

.sub-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
}

.sub-value {
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.1;
}

.sub-unit {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 0.2rem;
}

/* ===== Cashflow Card ===== */
.cashflow-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  margin-bottom: 1.25rem;
}

.cashflow-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.cashflow-title .bi {
  color: var(--primary);
}

.cashflow-grid {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
}

.cashflow-item {
  text-align: center;
  min-width: 110px;
}

.cashflow-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.cashflow-amount {
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
}

.cashflow-item.income .cashflow-amount  { color: var(--income-color); }
.cashflow-item.expense .cashflow-amount { color: var(--expense-color); }

.cashflow-separator {
  font-size: 1.25rem;
  color: var(--text-weak);
}

#cashflow-result-item.surplus .cashflow-amount { color: var(--surplus-color); }
#cashflow-result-item.deficit .cashflow-amount { color: var(--deficit-color); }

.shortage-info {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  display: none;
}

.shortage-info.show { display: block; }
.shortage-info.deficit-info  { background: #fef2f2; border: 1px solid #fecaca; color: #dc2626; }
.shortage-info.surplus-info  { background: #f0fdf4; border: 1px solid #bbf7d0; color: #166534; }

/* ===== Chart Card ===== */
.chart-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  margin-bottom: 1.25rem;
}

.chart-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

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

/* ===== Disclaimer ===== */
.disclaimer {
  background: #fafaf9;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.disclaimer .bi {
  flex-shrink: 0;
  margin-top: 0.1rem;
  color: var(--primary);
}

.disclaimer a {
  color: var(--primary);
  text-decoration: underline;
}

/* ===== Howto Section ===== */
.howto-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* ===== Accordion ===== */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.accordion-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.accordion-btn {
  width: 100%;
  min-height: 52px;
  padding: 0.75rem 1rem;
  background: #fafaf9;
  border: none;
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 700;
  font-family: inherit;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-align: left;
  transition: background var(--transition);
}

.accordion-btn:hover {
  background: #f5f3ff;
  color: var(--primary);
}

.accordion-btn:active {
  background: #ede9fe;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  min-width: 26px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.accordion-icon {
  margin-left: auto;
  transition: transform 0.2s ease;
  flex-shrink: 0;
  color: var(--text-muted);
}

.accordion-btn[aria-expanded="true"] .accordion-icon {
  transform: rotate(180deg);
}

.accordion-content {
  padding: 1rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid var(--border);
}

/* ===== Info Card ===== */
.info-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.info-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-top: 1.25rem;
  margin-bottom: 0.75rem;
}

/* ===== FAQ List ===== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-list dt {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.25rem;
}

.faq-list dd {
  font-size: 0.875rem;
  color: var(--text-muted);
  padding-left: 1.5rem;
  line-height: 1.7;
  margin-top: 0.2rem;
}

/* ===== Footer ===== */
footer {
  background: #1a1a2e;
  color: rgba(255,255,255,0.65);
  padding: 2rem 1.25rem;
  text-align: center;
  margin-top: 3rem;
}

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

.footer-logo {
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: rgba(255,255,255,0.85);
  margin-bottom: 0.75rem;
}

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

.footer-nav a {
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  font-size: 0.8125rem;
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: rgba(255,255,255,0.9);
}

.footer-copy {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.35);
}

/* ===== Responsive: Tablet (640px+) ===== */
@media (min-width: 640px) {
  header {
    padding: 2.5rem 1.5rem 2rem;
  }

  main {
    padding: 2rem 1.5rem 4rem;
  }

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

  .result-headline {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .result-main-card {
    padding: 2.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 100%;
  }

  .result-value {
    font-size: clamp(2.8rem, 5vw, 4rem);
  }
}

/* ===== Responsive: Desktop (900px+) ===== */
@media (min-width: 900px) {
  .form-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .card {
    padding: 2rem;
  }

  .chart-wrapper {
    height: 320px;
  }
}