/* ===========================
   CSS Custom Properties
   =========================== */
:root {
  --primary: #dc2626;
  --primary-hover: #b91c1c;
  --primary-rgb: 220, 38, 38;
  --primary-light: #fef2f2;
  --primary-border: #fecaca;
  --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;
}

/* ===========================
   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;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
  word-break: break-word;
}

/* ===========================
   Header
   =========================== */
header {
  background: var(--primary);
  color: #fff;
  padding: 1.5rem 1.25rem 1.25rem;
  text-align: center;
}

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

.header-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  opacity: 0.9;
}

header h1 {
  font-family: 'Outfit', 'BIZ UDPGothic', sans-serif;
  font-size: clamp(1.1rem, 3.5vw, 1.6rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.header-sub {
  font-size: 0.875rem;
  opacity: 0.88;
  margin-top: 0.4rem;
}

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

/* ===========================
   Ad Units
   =========================== */
.ad-unit {
  min-height: 0;
  background: #f1f5f9;
  margin: 1.25rem 0;
  border-radius: var(--radius-sm);
  border: 1px dashed #cbd5e1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* ===========================
   Privacy Notice
   =========================== */
.privacy-notice {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-sm);
  padding: 0.625rem 1rem;
  font-size: 0.8125rem;
  color: #1e40af;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ===========================
   Card
   =========================== */
.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);
}

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

.input-card {
  margin-bottom: 1rem;
}

/* ===========================
   Section Titles
   =========================== */
.section-title {
  font-family: 'Outfit', 'BIZ UDPGothic', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.subsection-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* ===========================
   Tab Bar
   =========================== */
.tab-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 0.25rem;
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.625rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  background: transparent;
  color: var(--text-muted);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  min-height: 44px;
  touch-action: manipulation;
}

.tab-btn:hover {
  background: rgba(220, 38, 38, 0.07);
  color: var(--primary);
}

.tab-btn.active {
  background: var(--surface);
  color: var(--primary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.10);
}

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

/* ===========================
   Tab Panel
   =========================== */
.tab-panel {
  margin-bottom: 1rem;
}

/* ===========================
   Form Elements
   =========================== */
.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: #374151;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.field-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.form-input {
  width: 100%;
  padding: 0.5rem 2.5rem 0.5rem 0.75rem;
  font-size: 0.9375rem;
  font-family: 'Outfit', 'BIZ UDPGothic', sans-serif;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
  min-height: 44px;
  -moz-appearance: textfield;
}

.form-input::-webkit-inner-spin-button,
.form-input::-webkit-outer-spin-button {
  opacity: 1;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
}

.input-suffix {
  position: absolute;
  right: 0.6rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  pointer-events: none;
}

/* ===========================
   Base Wage Display
   =========================== */
.base-wage-display {
  background: var(--primary-light);
  border: 1px solid var(--primary-border);
  border-radius: var(--radius-sm);
  padding: 0.625rem 0.875rem;
  font-size: 0.875rem;
  color: #991b1b;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.25rem;
}

.base-wage-display strong {
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
}

/* ===========================
   Overtime Grid
   =========================== */
.overtime-section {
  margin-top: 1.25rem;
  border-top: 1px solid var(--border);
  padding-top: 1.25rem;
}

.ot-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.ot-row {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.875rem;
  border-bottom: 1px solid #f1f5f9;
  transition: background var(--transition);
}

.ot-row:last-child {
  border-bottom: none;
}

.ot-row:not(.ot-header):hover {
  background: #fafafa;
}

.ot-header {
  background: #f8fafc;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.5rem 0.875rem;
  border-bottom: 1.5px solid var(--border);
}

.ot-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.ot-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

.ot-name small {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
}

.ot-desc {
  font-size: 0.75rem;
  color: var(--text-weak);
  line-height: 1.3;
}

.ot-rate {
  display: flex;
  justify-content: center;
  min-width: 60px;
}

.ot-input-wrap {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.ot-input {
  width: 72px;
  padding: 0.4rem 0.5rem;
  font-size: 0.9375rem;
  font-family: 'Outfit', 'BIZ UDPGothic', sans-serif;
  font-weight: 600;
  text-align: right;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
  min-height: 44px;
  -moz-appearance: textfield;
}

.ot-input::-webkit-inner-spin-button,
.ot-input::-webkit-outer-spin-button {
  opacity: 1;
}

.ot-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.15);
}

.ot-unit {
  font-size: 0.8125rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ===========================
   Badges
   =========================== */
.badge {
  font-family: 'Outfit', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 100px;
  white-space: nowrap;
}

.badge-gray {
  background: #f1f5f9;
  color: #64748b;
  border: 1px solid #e2e8f0;
}

.badge-yellow {
  background: #fefce8;
  color: #a16207;
  border: 1px solid #fde68a;
}

.badge-orange {
  background: #fff7ed;
  color: #c2410c;
  border: 1px solid #fed7aa;
}

.badge-red {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.badge-darkred {
  background: #fff1f2;
  color: #9f1239;
  border: 1px solid #fda4af;
}

/* ===========================
   Error Message
   =========================== */
.error-msg {
  background: #fff5f5;
  border: 1px solid #fed7d7;
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  color: #c53030;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
}

/* ===========================
   Calculate Button
   =========================== */
.btn-calc {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  margin-top: 1.25rem;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-family: 'Outfit', 'BIZ UDPGothic', sans-serif;
  font-weight: 700;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition), transform 0.12s ease, box-shadow var(--transition);
  min-height: 52px;
  box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.35);
  touch-action: manipulation;
}

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

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

/* ===========================
   Results Area
   =========================== */
.results-area {
  margin-top: 0.5rem;
}

/* ===========================
   Total Highlight Card
   =========================== */
.total-highlight-card {
  background: linear-gradient(135deg, #dc2626, #b91c1c);
  border-radius: var(--radius);
  padding: 1.5rem;
  color: #fff;
  margin-bottom: 1rem;
  box-shadow: 0 4px 20px rgba(220, 38, 38, 0.35);
}

.total-main {
  text-align: center;
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.25);
}

.total-label {
  font-size: 0.875rem;
  font-weight: 600;
  opacity: 0.9;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}

.total-amount {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2.5rem, 8vw, 3.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.total-sub {
  font-size: 0.8125rem;
  opacity: 0.82;
  margin-top: 0.4rem;
}

.unpaid-section {
  text-align: center;
}

.unpaid-label {
  font-size: 0.8125rem;
  font-weight: 600;
  opacity: 0.88;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-bottom: 0.25rem;
}

.unpaid-amount {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.unpaid-note {
  font-size: 0.75rem;
  opacity: 0.75;
  margin-top: 0.25rem;
}

/* ===========================
   Breakdown Card
   =========================== */
.breakdown-card {
  margin-bottom: 1rem;
}

.table-wrap {
  overflow-x: auto;
}

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

.breakdown-table th {
  background: #f8fafc;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8125rem;
  padding: 0.6rem 0.75rem;
  text-align: left;
  border-bottom: 1.5px solid var(--border);
}

.breakdown-table th:last-child,
.breakdown-table td:last-child {
  text-align: right;
}

.breakdown-table td {
  padding: 0.625rem 0.75rem;
  border-bottom: 1px solid #f1f5f9;
  color: var(--text);
}

.breakdown-table tbody tr:last-child td {
  border-bottom: none;
}

.breakdown-table tbody tr:hover td {
  background: #fafafa;
}

.breakdown-table .amount-cell {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
}

.total-row td {
  background: #fef2f2;
  font-weight: 700;
  font-family: 'Outfit', 'BIZ UDPGothic', sans-serif;
  border-top: 1.5px solid var(--primary-border);
  color: var(--primary);
  font-size: 0.9375rem;
}

/* ===========================
   Chart Card
   =========================== */
.chart-card {
  margin-bottom: 1rem;
}

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

/* ===========================
   Howto Section
   =========================== */
.howto-section {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  margin-top: 1.25rem;
}

.howto-section h2 {
  font-family: 'Outfit', 'BIZ UDPGothic', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.75rem;
  margin-top: 1.5rem;
  padding-left: 0.75rem;
  border-left: 3px solid var(--primary);
}

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

.howto-steps {
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
}

.howto-steps li {
  margin-bottom: 0.4rem;
  font-size: 0.9375rem;
  color: #374151;
}

.howto-section > p {
  font-size: 0.9375rem;
  color: #374151;
  line-height: 1.75;
  margin-bottom: 0.75rem;
  max-width: 65ch;
}

/* ===========================
   Accordion
   =========================== */
.accordion-group {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.accordion-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  min-height: 48px;
  transition: background var(--transition);
}

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

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

.accordion-icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  border-right: 2px solid var(--primary);
  border-bottom: 2px solid var(--primary);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
  margin-left: 0.5rem;
  margin-top: -4px;
}

.accordion-item[open] .accordion-icon {
  transform: rotate(-135deg);
  margin-top: 4px;
}

.accordion-body {
  padding: 0.875rem 1rem 1rem;
  border-top: 1px solid var(--border);
  background: #fafafa;
}

.accordion-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
  margin-bottom: 0.75rem;
}

.accordion-body th,
.accordion-body td {
  padding: 0.5rem 0.625rem;
  border: 1px solid var(--border);
  text-align: left;
}

.accordion-body th {
  background: #f1f5f9;
  font-weight: 600;
  color: var(--text-muted);
}

.accordion-body dl dt {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text);
  margin-top: 0.875rem;
}

.accordion-body dl dt:first-child {
  margin-top: 0;
}

.accordion-body dl dd {
  font-size: 0.875rem;
  color: #374151;
  margin-left: 0;
  padding-left: 0.875rem;
  border-left: 2px solid var(--border);
  margin-top: 0.25rem;
  line-height: 1.7;
}

.ref-links {
  list-style: none;
  padding: 0;
  margin-bottom: 0.875rem;
}

.ref-links li {
  margin-bottom: 0.4rem;
}

.ref-links a {
  font-size: 0.875rem;
  color: #2563eb;
  text-decoration: underline;
}

.ref-links a:hover {
  color: var(--primary);
}

.disclaimer-note {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.7;
  padding: 0.75rem;
  background: #f8fafc;
  border-radius: 6px;
  border: 1px solid var(--border);
}

/* ===========================
   CTA Box
   =========================== */
.cta-box {
  background: #fff8f1;
  border: 2px solid var(--primary);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 2rem 0;
}
.cta-box h3 {
  color: var(--primary);
  margin-bottom: 1rem;
  font-size: 1rem;
}
.cta-box ol {
  margin: 0 0 1rem 1.2rem;
}
.cta-box li {
  margin-bottom: 0.5rem;
}
.cta-box a {
  color: var(--primary);
  font-size: 0.875rem;
}

/* ===========================
   Footer
   =========================== */
footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.85rem;
  color: var(--text-weak);
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

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

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

footer p + p {
  margin-top: 0.5rem;
}

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

  .card {
    padding: 1.5rem;
  }

  .howto-section {
    padding: 1.75rem 1.75rem;
  }
}

/* ===========================
   Responsive — Small Mobile
   =========================== */
@media (max-width: 480px) {
  .form-row-2 {
    grid-template-columns: 1fr;
  }

  .ot-row {
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
  }

  .ot-row.ot-header {
    display: none;
  }

  .ot-info {
    grid-column: 1 / -1;
  }

  .ot-rate {
    justify-content: flex-start;
  }

  .total-amount {
    font-size: 2.2rem;
  }

  .unpaid-amount {
    font-size: 1.6rem;
  }
}