/* ===================================================
   t検定 計算ツール — style.css
   デザインシステム準拠: ティール #0d9488
=================================================== */

:root {
  --primary: #0d9488;
  --primary-hover: #0f766e;
  --primary-rgb: 13, 148, 136;
  --primary-light: #f0fdfa;
  --primary-border: #99f6e4;
  --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;

  /* Spacing (8px grid) */
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.25rem;
  --sp-6: 1.5rem;
  --sp-8: 2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

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

/* ===== Header ===== */
header {
  background: linear-gradient(135deg, var(--primary) 0%, #0f766e 100%);
  color: #fff;
  padding: var(--sp-8) var(--sp-5) var(--sp-6);
  text-align: center;
}

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

.header-icon {
  font-size: 2.2rem;
  margin-bottom: var(--sp-3);
  opacity: 0.92;
}

header h1 {
  font-size: clamp(1.4rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.subtitle {
  font-size: 0.9rem;
  opacity: 0.88;
  margin-top: var(--sp-2);
  font-weight: 400;
}

/* ===== Layout ===== */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--sp-6) var(--sp-5);
}

/* ===== Ad Units ===== */
.ad-unit {
  width: 100%;
  min-height: 90px;
  background: #f3f4f6;
  border: 1px dashed #d1d5db;
  border-radius: var(--radius-sm);
  margin: var(--sp-6) 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-weak);
  font-size: 0.8rem;
}

.ad-unit::after {
  content: '広告スペース';
}

/* ===== Privacy Notice ===== */
.privacy-notice {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  background: var(--primary-light);
  border: 1px solid var(--primary-border);
  border-radius: var(--radius-sm);
  padding: var(--sp-3) var(--sp-4);
  font-size: 0.875rem;
  color: #0f766e;
  margin-bottom: var(--sp-5);
}

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

/* ===== Tool Section ===== */
.tool-section {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  overflow: hidden;
}

/* ===== Tabs ===== */
.tabs {
  display: flex;
  border-bottom: 2px solid var(--border);
  background: #f8fafc;
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-4) var(--sp-3);
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  min-height: 52px;
}

.tab-btn i { font-size: 1rem; }

.tab-btn:hover {
  color: var(--primary);
  background: var(--primary-light);
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background: var(--surface);
}

/* ===== Tab Panels ===== */
.tab-panel {
  display: none;
  padding: var(--sp-6);
}

.tab-panel.active { display: block; }

.tab-description {
  display: flex;
  gap: var(--sp-3);
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--sp-3) var(--sp-4);
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--sp-5);
  line-height: 1.55;
}

.tab-description i { flex-shrink: 0; margin-top: 2px; color: var(--primary); }

/* ===== Input Grid ===== */
.input-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
  margin-bottom: var(--sp-5);
}

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

.onesample-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
  margin-bottom: var(--sp-5);
}

@media (min-width: 640px) {
  .onesample-grid { grid-template-columns: 2fr 1fr; align-items: start; }
}

/* ===== Field ===== */
.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);
}

/* ===== Inputs ===== */
.data-input,
input[type="number"] {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--sp-3) var(--sp-3);
  font-size: 0.9375rem;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
  min-height: 44px;
}

.data-input {
  resize: vertical;
  line-height: 1.6;
}

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

.input-count {
  font-size: 0.8125rem;
  color: var(--primary);
  font-weight: 600;
  text-align: right;
}

.mu-field input {
  font-size: 1.1rem;
}

/* ===== Button Row ===== */
.btn-row {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.625rem 1.5rem;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.30);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.35);
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 0.625rem 1.25rem;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn-secondary:hover {
  background: var(--primary-light);
  transform: translateY(-1px);
}

.btn-secondary:active {
  transform: translateY(0);
}

/* ===== Result Area ===== */
.result-area {
  border-top: 2px solid var(--border);
  padding: var(--sp-6);
  background: #fcfcfc;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--sp-10) var(--sp-4);
  color: var(--text-weak);
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: var(--sp-3);
  color: #d1d5db;
}

.empty-title {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 600;
}

.empty-desc {
  font-size: 0.875rem;
  margin-top: var(--sp-2);
}

/* ===== Significance Badge ===== */
.sig-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.5rem 1.25rem;
  border-radius: 100px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.sig-badge.significant {
  background: #dcfce7;
  color: #15803d;
  border: 1.5px solid #86efac;
}

.sig-badge.not-significant {
  background: #fef9c3;
  color: #854d0e;
  border: 1.5px solid #fde047;
}

/* ===== Result Cards Grid ===== */
.result-header {
  margin-bottom: var(--sp-5);
  text-align: center;
}

.result-header h3 {
  font-size: 1.05rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: var(--sp-3);
}

.result-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--sp-4);
  margin-bottom: var(--sp-5);
}

.result-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: var(--sp-4) var(--sp-5);
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  text-align: center;
}

.result-card .rc-value {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--primary);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.result-card .rc-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: var(--sp-2);
  line-height: 1.4;
}

.result-card.highlight {
  background: var(--primary-light);
  border-color: var(--primary-border);
}

.result-card.highlight .rc-value {
  color: #0f766e;
}

/* ===== CI Display ===== */
.ci-display {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--sp-3) var(--sp-4);
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: var(--sp-5);
}

.ci-display strong { color: var(--text); }

/* ===== Summary Table ===== */
.summary-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin-bottom: var(--sp-5);
}

.summary-table th, .summary-table td {
  padding: var(--sp-3) var(--sp-4);
  text-align: right;
  border-bottom: 1px solid var(--border);
}

.summary-table th {
  font-weight: 600;
  color: var(--text-muted);
  background: #f8fafc;
  text-align: center;
}

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

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

/* ===== Chart Container ===== */
.chart-wrapper {
  position: relative;
  height: 240px;
  margin-bottom: var(--sp-5);
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  padding: var(--sp-4);
}

/* ===== Error Message ===== */
.error-msg {
  background: #fef2f2;
  border: 1.5px solid #fca5a5;
  border-radius: var(--radius-sm);
  padding: var(--sp-3) var(--sp-4);
  color: #b91c1c;
  font-size: 0.9rem;
  display: flex;
  align-items: flex-start;
  gap: var(--sp-2);
}

.error-msg i { flex-shrink: 0; margin-top: 2px; font-size: 1rem; }

/* ===== Cohen's d bar ===== */
.cohend-bar-wrap {
  margin-bottom: var(--sp-4);
}

.cohend-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: var(--sp-2);
}

.cohend-bar-bg {
  height: 10px;
  background: #e5e7eb;
  border-radius: 100px;
  overflow: hidden;
  position: relative;
}

.cohend-bar-fill {
  height: 100%;
  border-radius: 100px;
  background: linear-gradient(90deg, var(--primary) 0%, #2dd4bf 100%);
  transition: width 0.5s ease;
  max-width: 100%;
}

.cohend-bar-markers {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-weak);
  margin-top: 4px;
}

/* ===== Report Example ===== */
.report-example {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 1rem;
  margin-top: 1rem;
  margin-bottom: var(--sp-5);
}

.report-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: #374151;
  margin-bottom: 0.5rem;
}

.report-code {
  display: block;
  font-family: monospace;
  font-size: 0.9rem;
  color: #1e40af;
  padding: 0.5rem;
  background: #eff6ff;
  border-radius: 4px;
  margin-bottom: 0.5rem;
  word-break: break-all;
}

.copy-btn {
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  min-height: 28px;
  transition: background var(--transition);
}

.copy-btn:hover {
  background: var(--primary-hover);
}

/* ===== Howto Section ===== */
.howto-section {
  margin-top: var(--sp-8);
}

.section-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--sp-4);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

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

/* ===== Accordion ===== */
.accordion {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid rgba(0,0,0,0.05);
  margin-bottom: var(--sp-3);
  overflow: hidden;
}

.accordion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-4) var(--sp-5);
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text);
  transition: background var(--transition);
  min-height: 56px;
}

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

.accordion-header:hover { background: var(--primary-light); }

.accordion-header span {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.accordion-header span i { color: var(--primary); }

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

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

.accordion-body {
  padding: 0 var(--sp-5) var(--sp-5);
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.75;
}

.accordion-body p { margin-bottom: var(--sp-3); }
.accordion-body p:last-child { margin-bottom: 0; }

.accordion-body ul, .accordion-body ol {
  padding-left: var(--sp-6);
  margin-bottom: var(--sp-3);
}

.accordion-body li { margin-bottom: var(--sp-2); }

/* ===== Howto Steps ===== */
.howto-steps {
  padding-left: var(--sp-5);
  margin-bottom: var(--sp-3);
}

.howto-steps li {
  margin-bottom: var(--sp-3);
}

/* ===== Comparison Table ===== */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin-bottom: var(--sp-4);
}

.comparison-table th, .comparison-table td {
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  line-height: 1.6;
}

.comparison-table th {
  background: #f8fafc;
  font-weight: 700;
  color: var(--text);
}

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

/* ===== FAQ ===== */
.faq-list { display: flex; flex-direction: column; gap: var(--sp-4); }

.faq-item {
  padding: var(--sp-4);
  background: #f8fafc;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
}

.faq-q {
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--sp-2);
  font-size: 0.9rem;
  display: flex;
  align-items: flex-start;
  gap: var(--sp-2);
}

.faq-q i { color: var(--primary); flex-shrink: 0; margin-top: 2px; }

.faq-a {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 0 !important;
}

/* ===== Footer ===== */
footer {
  background: #1a1a2e;
  color: #9ca3af;
  padding: var(--sp-6) var(--sp-5);
  text-align: center;
  margin-top: var(--sp-12);
}

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

.footer-links {
  font-size: 0.875rem;
  margin-bottom: var(--sp-2);
}

.footer-links a {
  color: #a5b4fc;
  text-decoration: none;
}

.footer-links a:hover { color: #fff; }

.footer-sep { margin: 0 var(--sp-3); color: #4b5563; }

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

/* ===== Responsive ===== */
@media (max-width: 480px) {
  .container { padding: var(--sp-4) var(--sp-4); }
  .tab-panel { padding: var(--sp-4); }
  .result-area { padding: var(--sp-4); }
  .tabs { overflow-x: auto; }
  .tab-btn { font-size: 0.8125rem; padding: var(--sp-3) var(--sp-2); flex-direction: column; gap: 2px; }
  .tab-btn span { font-size: 0.75rem; line-height: 1.2; text-align: center; }
  .tab-btn i { font-size: 1.1rem; }
  .result-cards { grid-template-columns: 1fr 1fr; }
  .btn-row { justify-content: stretch; }
  .btn-primary, .btn-secondary { flex: 1; justify-content: center; }
  .accordion-header { padding: var(--sp-4); }
  .accordion-body { padding: 0 var(--sp-4) var(--sp-4); }
}

@media (min-width: 640px) {
  .result-cards { grid-template-columns: repeat(4, 1fr); }
}