/* =============================================
   固定資産税・都市計画税 計算ツール
   Design: Amber系（#92400e メイン）
   ============================================= */

:root {
  --primary: #92400e;
  --primary-hover: #78350f;
  --primary-light: #fef3c7;
  --primary-rgb: 146, 64, 14;
  --accent: #d97706;
  --accent-hover: #b45309;
  --bg: #f9f7f4;
  --surface: #ffffff;
  --text: #1a1a2e;
  --text-muted: #6b7280;
  --text-weak: #9ca3af;
  --border: #e2e8f0;
  --border-amber: #fcd34d;
  --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;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'BIZ UDPGothic', -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;
}

/* ===================== HEADER ===================== */
header {
  background: linear-gradient(135deg, var(--primary) 0%, #78350f 100%);
  color: #fff;
  padding: var(--space-8) var(--space-4) var(--space-6);
  text-align: center;
}

.header-inner {
  max-width: 760px;
  margin: 0 auto;
}

.header-icon {
  font-size: 2.25rem;
  margin-bottom: var(--space-3);
  opacity: 0.92;
}

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

.subtitle {
  font-size: 0.9rem;
  opacity: 0.88;
  margin-top: var(--space-2);
  line-height: 1.6;
}

/* ===================== MAIN ===================== */
main {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-4) var(--space-12);
}

/* ===================== AD UNIT ===================== */
.ad-unit {
  min-height: 0;
  margin: var(--space-6) 0;
}

/* ===================== PRIVACY NOTICE ===================== */
.privacy-notice {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: #ecfdf5;
  border: 1px solid #6ee7b7;
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  font-size: 0.8125rem;
  color: #065f46;
  margin-bottom: var(--space-5);
}

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

/* ===================== FORM CARDS ===================== */
.tool-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.form-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: var(--space-5) var(--space-4);
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  transition: box-shadow var(--transition);
}

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

.form-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.form-card__title i {
  font-size: 1.1rem;
}

/* ===================== FIELD ===================== */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: var(--space-4);
}

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

.field-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

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

.field-hint {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.input-with-unit {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

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

input[type="number"],
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: auto;
  -webkit-appearance: auto;
}

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

input[type="number"]::placeholder {
  color: var(--text-weak);
}

select {
  cursor: pointer;
}

/* ===================== CHECKBOX ===================== */
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text);
  min-height: 44px;
  padding: var(--space-2) 0;
}

.checkbox-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  min-height: 20px;
  flex-shrink: 0;
  accent-color: var(--primary);
  cursor: pointer;
}

/* ===================== BUTTON ===================== */
.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  min-height: 52px;
  transition: background var(--transition), transform 0.12s ease, box-shadow var(--transition);
  box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.35);
  margin-top: var(--space-2);
}

.btn-primary i {
  font-size: 1.1rem;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.40);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: none;
}

/* ===================== ERROR MESSAGE ===================== */
.error-msg {
  background: #fef2f2;
  border: 1px solid #fca5a5;
  border-radius: var(--radius-sm);
  color: #dc2626;
  padding: var(--space-3) var(--space-4);
  font-size: 0.875rem;
  margin-top: var(--space-3);
}

/* ===================== RESULT SECTION ===================== */
.result-section {
  background: var(--surface);
  border-radius: var(--radius);
  padding: var(--space-6) var(--space-4);
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  margin-top: var(--space-4);
}

.result-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* 合計ヒーロー */
.result-hero {
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
  border: 1.5px solid var(--border-amber);
  border-radius: var(--radius);
  padding: var(--space-6);
  text-align: center;
  margin-bottom: var(--space-5);
}

.result-hero__label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.result-hero__value {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2.2rem, 8vw, 3.5rem);
  font-weight: 700;
  color: var(--primary);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.result-hero__sub {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  margin-top: var(--space-3);
  font-size: 0.875rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.result-hero__sub strong {
  color: var(--primary);
  font-weight: 700;
}

/* 内訳テーブル */
.result-breakdown {
  margin-bottom: var(--space-5);
}

.breakdown-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-3);
}

.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.breakdown-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  min-width: 380px;
}

.breakdown-table th {
  background: #fef3c7;
  color: var(--primary);
  font-weight: 700;
  padding: var(--space-2) var(--space-3);
  text-align: right;
  border-bottom: 2px solid var(--border-amber);
  white-space: nowrap;
}

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

.breakdown-table td {
  padding: var(--space-2) var(--space-3);
  text-align: right;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.breakdown-table td:first-child {
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
}

.breakdown-table .total-row {
  background: #fffbeb;
}

.breakdown-table .total-row td {
  border-top: 2px solid var(--border-amber);
  border-bottom: none;
  font-weight: 700;
  color: var(--primary);
}

.breakdown-table .total-row td:first-child {
  color: var(--primary);
}

/* 軽減バナー */
.reduction-banner {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  background: #eff6ff;
  border: 1px solid #93c5fd;
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  font-size: 0.875rem;
  color: #1d4ed8;
  margin-bottom: var(--space-5);
  line-height: 1.6;
}

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

/* グラフ */
.chart-container {
  margin-bottom: var(--space-5);
}

.chart-wrap {
  max-width: 300px;
  margin: 0 auto;
}

/* 注記 */
.result-note {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.result-note i {
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

/* ===================== SECTION TITLES ===================== */
.section-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.section-title i {
  color: var(--accent);
}

/* ===================== HOWTO SECTION ===================== */
.howto-section {
  background: var(--surface);
  border-radius: var(--radius);
  padding: var(--space-6) var(--space-4);
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  margin-top: var(--space-8);
}

/* ===================== ACCORDION ===================== */
.accordion {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

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

.accordion-summary {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  background: #fffbeb;
  list-style: none;
  min-height: 52px;
  transition: background var(--transition);
  user-select: none;
}

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

.accordion-summary::after {
  content: '\F282';
  font-family: 'bootstrap-icons';
  margin-left: auto;
  font-size: 1rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

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

.accordion-summary:hover {
  background: #fef3c7;
}

.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.accordion-body {
  padding: var(--space-4);
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.75;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

/* ===================== INFO SECTION ===================== */
.info-section {
  margin-top: var(--space-8);
}

.info-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: var(--space-6) var(--space-4);
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.info-card p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 65ch;
}

/* ===================== FAQ SECTION ===================== */
.faq-section {
  margin-top: var(--space-8);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  transition: box-shadow var(--transition);
}

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  min-height: 52px;
  transition: color var(--transition), background var(--transition);
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: '\F282';
  font-family: 'bootstrap-icons';
  font-size: 1rem;
  color: var(--text-weak);
  flex-shrink: 0;
  margin-left: var(--space-3);
  transition: transform 0.2s ease;
}

details[open] .faq-question::after {
  transform: rotate(180deg);
}

.faq-question:hover {
  color: var(--primary);
  background: #fffbeb;
}

.faq-answer {
  padding: var(--space-4);
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.75;
  border-top: 1px solid var(--border);
}

/* ===================== FOOTER ===================== */
footer {
  background: #1a1a2e;
  color: #9ca3af;
  padding: var(--space-8) var(--space-4);
  margin-top: var(--space-12);
}

.footer-inner {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-brand {
  font-weight: 700;
  color: #e5e7eb;
  font-size: 0.9375rem;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.footer-nav a {
  color: #9ca3af;
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: #e5e7eb;
}

.footer-copy {
  font-size: 0.8125rem;
  color: #6b7280;
}

/* ===================== RESPONSIVE ===================== */
@media (min-width: 640px) {
  main {
    padding: var(--space-6) var(--space-8) var(--space-12);
  }

  .form-card {
    padding: var(--space-6);
  }

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

  .result-section {
    padding: var(--space-8) var(--space-6);
  }

  .howto-section {
    padding: var(--space-6);
  }

  .info-card {
    padding: var(--space-6);
  }
}

@media (min-width: 900px) {
  main {
    padding: var(--space-8) var(--space-4) var(--space-12);
  }

  .result-hero__value {
    font-size: 3.5rem;
  }
}

/* ===================== PRINT ===================== */
@media print {
  header {
    background: var(--primary) !important;
    -webkit-print-color-adjust: exact;
  }

  .ad-unit {
    display: none;
  }
}