:root {
  --brand: #006938;
  --brand-dark: #00532c;
  --brand-light: #e6f1eb;
  --brand-faint: #f4f9f6;
  --text: #2a2a2a;
  --text-sub: #666;
  --border: #e3e6e4;
  --bg: #ffffff;
  --bg-soft: #f7f8f7;
  --new-badge: #1a8b4d;
  --laminar: #2c7be5;
  --transition: #e09f00;
  --turbulent: #d63b3b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 15px;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

button { font-family: inherit; cursor: pointer; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-header .inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
}
.logo:hover { text-decoration: none; }
.logo svg { width: 30px; height: 30px; }
.logo img { height: 34px; width: auto; display: block; }
.site-nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
}
.site-nav a {
  color: var(--text-sub);
  font-weight: 500;
}
.site-nav a:hover { color: var(--brand); text-decoration: none; }

/* ===== Hero ===== */
.hero {
  position: relative;
  background: linear-gradient(180deg, #fbfdfc 0%, #ffffff 100%);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-image: url("../img/hero-bg.png");
  background-repeat: no-repeat;
  background-position: center top;
  background-size: contain;
  pointer-events: none;
  z-index: 0;
}
.hero-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: clamp(72px, 8vw, 96px) 32px clamp(64px, 7vw, 84px);
  min-height: clamp(180px, 22vw, 260px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
}
.hero h1 {
  font-size: 46px;
  font-weight: 700;
  line-height: 1.3;
  margin: 0 0 12px;
  letter-spacing: 0.02em;
}
.hero .lead {
  font-size: 17px;
  color: var(--text-sub);
  margin: 0 0 28px;
}
.search {
  display: flex;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  max-width: 540px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.search input {
  flex: 1;
  border: none;
  outline: none;
  padding: 16px 18px 16px 46px;
  font-size: 15px;
  font-family: inherit;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><circle cx='11' cy='11' r='8'/><line x1='21' y1='21' x2='16.65' y2='16.65'/></svg>");
  background-repeat: no-repeat;
  background-position: 16px center;
}
.search button {
  background: var(--brand);
  color: #fff;
  border: none;
  padding: 0 30px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.search button:hover { background: var(--brand-dark); }

.keywords {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}
.keywords-label {
  color: var(--text-sub);
  margin-right: 4px;
}
.chip {
  display: inline-block;
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-sub);
  background: #fff;
  font-size: 12.5px;
  cursor: pointer;
  transition: all 0.15s;
}
.chip:hover {
  border-color: var(--brand);
  color: var(--brand);
  text-decoration: none;
}

.hero-illust-removed { display: none !important; }
.hero-waves { display: none; }

/* ===== Section common ===== */
.section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 32px;
}
.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 28px;
}
.section-title::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 22px;
  background: var(--brand);
  border-radius: 2px;
}

/* ===== Category grid ===== */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 16px;
}
.cat-grid-launch {
  grid-template-columns: 1fr 3fr;
}
.cat-coming {
  background: linear-gradient(135deg, var(--brand-faint) 0%, #ffffff 100%);
  border: 1.5px dashed rgba(0,105,56,0.45);
  border-radius: 8px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cat-coming::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(-45deg, transparent 0 18px, rgba(0,105,56,0.035) 18px 36px);
  pointer-events: none;
}
.cat-coming-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.45em;
  padding-left: 0.45em;
  color: var(--brand);
  background: #fff;
  padding: 7px 18px;
  border: 1px solid var(--brand);
  border-radius: 999px;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}
.cat-coming-title {
  font-size: 13.5px;
  color: var(--text-sub);
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}
.cat-coming-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 10px;
  position: relative;
  z-index: 1;
}
.cat-coming-list span {
  font-size: 12px;
  padding: 5px 14px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-sub);
}
.cat-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px 16px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: all 0.18s;
  color: var(--text);
}
.cat-card:hover {
  border-color: var(--brand);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0,105,56,0.08);
  text-decoration: none;
}
.cat-card .icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  color: var(--brand);
}
.cat-card .icon svg { width: 100%; height: 100%; }
.cat-card .name {
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 8px;
}
.cat-card .desc {
  font-size: 12px;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 12px;
  flex: 1;
}
.cat-card .more {
  color: var(--brand);
  font-size: 16px;
  line-height: 1;
}

/* ===== Info columns ===== */
.info-section {
  background: var(--bg-soft);
  padding: 60px 0;
  border-top: 1px solid var(--border);
}
.info-grid {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.info-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px 26px;
}
.info-card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 18px;
  color: var(--brand);
}
.info-card h3 svg { width: 18px; height: 18px; }
.info-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}
.info-list li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
}
.info-list li:last-child { border-bottom: none; }
.info-card .info-list.updates li:nth-child(5) { border-bottom: none; }
.info-card .info-list.updates li:nth-child(n+6) { display: none; }
.rank-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--brand-light);
  color: var(--brand);
  font-weight: 700;
  font-size: 12px;
  flex-shrink: 0;
}
.info-list .item-name { flex: 1; color: var(--text); }
.info-list .item-name a {
  color: var(--brand);
  text-decoration: underline;
  text-decoration-color: rgba(0,105,56,0.35);
  text-underline-offset: 3px;
  transition: color 0.15s, text-decoration-color 0.15s;
}
.info-list .item-name a:hover {
  color: var(--brand-dark);
  text-decoration-color: var(--brand-dark);
}
.info-list .item-desc { color: var(--text-sub); font-size: 12px; }
.info-list .arrow { color: #ccc; font-size: 14px; }
.info-list.guide li { padding: 12px 0; }
.info-list.guide .icon-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--brand-faint);
  border-radius: 4px;
  color: var(--brand);
  flex-shrink: 0;
}
.info-list.updates .date {
  color: var(--text-sub);
  font-size: 12px;
  font-family: "SF Mono", Consolas, monospace;
  flex-shrink: 0;
}
.new-badge {
  display: inline-block;
  background: var(--new-badge);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 3px;
  margin-left: 4px;
  letter-spacing: 0.05em;
}
.info-more {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--brand);
  font-weight: 500;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  padding: 50px 0 30px;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1.5fr;
  gap: 40px;
}
.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  margin: 0 0 16px;
  color: var(--brand);
}
.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-col li { margin-bottom: 10px; font-size: 13px; }
.footer-col a { color: var(--text-sub); }
.footer-col a:hover { color: var(--brand); }
.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: space-between;
}
.footer-brand .logo { font-size: 16px; }
.footer-copy {
  margin-top: 14px;
  font-size: 11.5px;
  color: var(--text-sub);
}

/* ===== Tool page ===== */
.tool-page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px;
}
.breadcrumb {
  font-size: 13px;
  color: var(--text-sub);
  margin-bottom: 18px;
}
.breadcrumb a { color: var(--text-sub); }
.breadcrumb .sep { margin: 0 8px; color: #bbb; }
.breadcrumb .current { color: var(--text); }

.tool-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 22px;
  margin-bottom: 32px;
}
.tool-header h1 {
  font-size: 28px;
  font-weight: 700;
  margin: 0 0 10px;
}
.tool-header .desc {
  color: var(--text-sub);
  font-size: 14.5px;
  margin: 0;
}
.tool-header .cat-tag {
  display: inline-block;
  background: var(--brand-light);
  color: var(--brand);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 3px;
  margin-bottom: 12px;
}

.tool-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 36px;
}
.panel {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 26px 28px;
}
.panel h2 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 22px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.panel h2::before {
  content: "";
  width: 3px;
  height: 16px;
  background: var(--brand);
  border-radius: 2px;
}

.input-row {
  margin-bottom: 18px;
}
.input-row label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}
.input-row label .sym {
  color: var(--text-sub);
  font-weight: 400;
  margin-left: 4px;
  font-style: italic;
}
.input-group {
  display: flex;
  gap: 8px;
}
.input-group input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}
.input-group input:focus { border-color: var(--brand); }
.input-group select {
  padding: 10px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  background: #fff;
  font-family: inherit;
  outline: none;
  min-width: 90px;
}

.btn-row {
  display: flex;
  gap: 10px;
  margin-top: 22px;
}
.btn {
  padding: 12px 22px;
  border: none;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-primary {
  background: var(--brand);
  color: #fff;
  flex: 1;
}
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text-sub);
}
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }

.preset-row {
  margin-top: 6px;
  font-size: 12px;
}
.preset-row a {
  margin-right: 12px;
  color: var(--brand);
  cursor: pointer;
}

/* ===== Result ===== */
.result-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.result-item {
  background: var(--brand-faint);
  border-left: 3px solid var(--brand);
  padding: 14px 18px;
  border-radius: 4px;
}
.result-item .label {
  font-size: 12px;
  color: var(--text-sub);
  margin-bottom: 4px;
}
.result-item .value {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  font-family: "SF Mono", Consolas, monospace;
}
.result-item .unit {
  font-size: 13px;
  color: var(--text-sub);
  margin-left: 4px;
  font-weight: 500;
}
.regime-display {
  margin-top: 6px;
  padding: 18px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
  text-align: center;
}
.regime-label {
  font-size: 12px;
  color: var(--text-sub);
  margin-bottom: 6px;
}
.regime-badge {
  display: inline-block;
  padding: 8px 22px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 16px;
  color: #fff;
  background: #aaa;
  letter-spacing: 0.05em;
}
.regime-badge.laminar { background: var(--laminar); }
.regime-badge.transition { background: var(--transition); }
.regime-badge.turbulent { background: var(--turbulent); }
.regime-note {
  font-size: 12px;
  color: var(--text-sub);
  margin-top: 8px;
}

.placeholder {
  color: #bbb;
  text-align: center;
  padding: 40px 0;
  font-size: 13px;
}

/* ===== Formula / notes ===== */
details.formula {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 22px;
}
details.formula summary {
  padding: 16px 24px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}
details.formula summary::before {
  content: "📐";
  font-size: 16px;
}
details.formula[open] summary { border-bottom: 1px solid var(--border); }
details.formula .body {
  padding: 22px 28px;
}
.formula-block {
  background: var(--brand-faint);
  padding: 16px 20px;
  border-radius: 4px;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 15px;
  margin: 12px 0;
}
.formula-block .var {
  color: var(--brand);
  font-weight: 700;
}

.notes {
  background: #fffaf0;
  border-left: 3px solid #e09f00;
  padding: 16px 22px;
  border-radius: 4px;
  font-size: 13.5px;
  margin-bottom: 22px;
}
.notes h3 {
  font-size: 14px;
  margin: 0 0 8px;
  color: #b07a00;
}
.notes ul { margin: 0; padding-left: 18px; }
.notes li { margin-bottom: 4px; }

.related h3 {
  font-size: 16px;
  margin: 0 0 14px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.related-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  font-size: 13.5px;
  color: var(--text);
}
.related-card:hover {
  border-color: var(--brand);
  text-decoration: none;
}
.related-card .small {
  display: block;
  font-size: 11px;
  color: var(--text-sub);
  margin-bottom: 4px;
}

.error-msg {
  background: #fef2f2;
  border-left: 3px solid var(--turbulent);
  color: #b32424;
  padding: 12px 16px;
  border-radius: 4px;
  font-size: 13px;
  margin-top: 14px;
}

/* ===== Tool page (extended) ===== */
.tool-page-wide { max-width: 1080px; }

.tool-hero {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 36px;
  align-items: center;
  padding: 36px 0 28px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 36px;
}
.tool-hero-simple {
  display: block;
}
.tool-hero h1 {
  font-size: 30px;
  font-weight: 700;
  margin: 6px 0 12px;
  line-height: 1.35;
}
.tool-hero .cat-tag {
  display: inline-block;
  background: var(--brand-light);
  color: var(--brand);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 3px;
}
.tool-subcopy {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  margin: 0 0 14px;
  line-height: 1.7;
}
.tool-desc {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.85;
  margin: 0;
}
.tool-hero-illust svg { width: 100%; height: auto; max-height: 220px; }

/* ===== Calculator card ===== */
.calc-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 44px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.03);
}
.mode-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
}
.mode-tab {
  flex: 1;
  padding: 16px 12px;
  background: transparent;
  border: none;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-sub);
  font-family: inherit;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.15s;
}
.mode-tab:hover { color: var(--brand); background: rgba(0,105,56,0.04); }
.mode-tab.active {
  color: var(--brand);
  background: #fff;
  border-bottom-color: var(--brand);
}
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.calc-pane {
  padding: 28px 30px;
}
.calc-input-pane {
  border-right: 1px solid var(--border);
  background: #fff;
}
.calc-result-pane { background: var(--brand-faint); }
.calc-pane h2 {
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 22px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.calc-pane h2::before {
  content: "";
  width: 3px;
  height: 16px;
  background: var(--brand);
  border-radius: 2px;
}

/* ===== Preset ===== */
.preset-block {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  margin-bottom: 20px;
}
.preset-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-sub);
  margin-bottom: 8px;
}
.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}
.preset-buttons button {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text-sub);
  font-family: inherit;
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.15s;
}
.preset-buttons button:hover {
  border-color: var(--brand);
  color: var(--brand);
}
.preset-note {
  font-size: 11.5px;
  color: var(--text-sub);
  margin: 0;
  line-height: 1.6;
}
.input-row .hint {
  font-size: 11.5px;
  color: var(--text-sub);
  margin: 6px 0 0;
  line-height: 1.6;
}
.input-row[hidden] { display: none; }

/* ===== Result ===== */
.result-main {
  text-align: center;
  padding: 18px 12px 22px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 16px;
}
.result-main .result-label {
  font-size: 12px;
  color: var(--text-sub);
  margin-bottom: 6px;
}
.result-value-big {
  font-family: "SF Mono", Consolas, monospace;
  font-size: 38px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.result-value-big .unit {
  font-size: 14px;
  color: var(--text-sub);
  font-weight: 500;
  margin-left: 6px;
}
.regime-badge {
  display: inline-block;
  padding: 6px 18px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 14px;
  color: #fff;
  background: #aaa;
  letter-spacing: 0.05em;
}
.regime-badge.laminar { background: var(--laminar); }
.regime-badge.transition { background: var(--transition); }
.regime-badge.turbulent { background: var(--turbulent); }

.regime-scale {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}
.scale-zones {
  display: grid;
  grid-template-columns: 30% 10% 60%;
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 4px;
  text-align: center;
}
.scale-zones .z-laminar { color: var(--laminar); }
.scale-zones .z-transition { color: var(--transition); }
.scale-zones .z-turbulent { color: var(--turbulent); }
.scale-bar {
  position: relative;
  height: 10px;
  border-radius: 5px;
  background: linear-gradient(to right,
    rgba(44,123,229,0.7) 0%, rgba(44,123,229,0.7) 30%,
    rgba(224,159,0,0.7) 30%, rgba(224,159,0,0.7) 40%,
    rgba(214,59,59,0.7) 40%, rgba(214,59,59,0.7) 100%);
  margin: 4px 0;
}
.scale-marker {
  position: absolute;
  top: -3px;
  width: 3px;
  height: 16px;
  background: var(--text);
  border: 1.5px solid #fff;
  border-radius: 2px;
  transform: translateX(-50%);
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}
.scale-labels {
  position: relative;
  height: 16px;
  font-size: 10.5px;
  color: var(--text-sub);
  margin-top: 6px;
}
.scale-labels span {
  position: absolute;
  white-space: nowrap;
}

.result-aux {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 14px;
}
.aux-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 13px;
}
.aux-item:last-child { border-bottom: none; }
.aux-label { color: var(--text-sub); }
.aux-value {
  font-family: "SF Mono", Consolas, monospace;
  color: var(--text);
  font-weight: 600;
}

.regime-comment {
  background: #fff;
  border-left: 3px solid var(--brand);
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text);
  border-radius: 4px;
  margin-bottom: 14px;
}

.calc-process {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
}
.calc-process summary {
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-sub);
  cursor: pointer;
}
.calc-process[open] summary { border-bottom: 1px solid var(--border); }
.calc-process-body {
  padding: 14px 16px;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--text);
  background: var(--bg-soft);
  border-radius: 0 0 8px 8px;
  white-space: pre-wrap;
}

/* ===== Explanation blocks ===== */
.explain-block {
  margin-bottom: 36px;
}
.explain-block h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--brand);
  line-height: 1.4;
}
.explain-block h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--brand);
  margin: 22px 0 8px;
}
.explain-block p {
  font-size: 14.5px;
  line-height: 1.85;
  margin: 0 0 12px;
  color: var(--text);
}
.explain-block ul, .explain-block ol {
  padding-left: 22px;
  margin: 0 0 14px;
}
.explain-block li {
  font-size: 14px;
  line-height: 1.85;
  margin-bottom: 6px;
}
.formula-block-large {
  background: var(--brand-faint);
  border-left: 3px solid var(--brand);
  padding: 18px 22px;
  border-radius: 4px;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 18px;
  text-align: center;
  margin: 14px 0;
  letter-spacing: 0.02em;
}
.formula-block-small {
  background: var(--brand-faint);
  padding: 10px 16px;
  border-radius: 4px;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 14px;
  display: inline-block;
  margin: 6px 0 14px;
}
.formula-block-large .var,
.formula-block-small .var {
  color: var(--brand);
  font-weight: 700;
  font-style: italic;
}
.regime-table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0 16px;
  font-size: 14px;
}
.regime-table th,
.regime-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.regime-table th {
  background: var(--bg-soft);
  font-weight: 700;
  font-size: 13px;
  color: var(--text-sub);
}
.caution-text {
  background: #fffaf0;
  border-left: 3px solid #e09f00;
  padding: 12px 16px;
  border-radius: 4px;
  font-size: 13px;
  color: var(--text);
  margin-top: 14px;
}
.example-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 22px;
  margin-bottom: 16px;
}
.example-title {
  font-weight: 700;
  font-size: 15px;
  color: var(--brand);
  margin-bottom: 10px;
}
.example-conds {
  font-size: 13.5px;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px 18px;
  margin-bottom: 12px !important;
}
.example-calc {
  background: #fff;
  border-left: 3px solid var(--brand);
  padding: 12px 16px;
  font-family: "SF Mono", Consolas, monospace;
  font-size: 13.5px;
  margin-bottom: 10px;
  border-radius: 4px;
}
.example-result {
  font-size: 13.5px !important;
  color: var(--text-sub);
  margin: 0 !important;
}
.mistake-list {
  list-style: none !important;
  padding: 0 !important;
  counter-reset: mistake;
}
.mistake-list li {
  counter-increment: mistake;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 18px 14px 56px;
  margin-bottom: 10px !important;
  position: relative;
}
.mistake-list li::before {
  content: counter(mistake);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--brand-light);
  color: var(--brand);
  font-weight: 700;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mistake-list .mistake-title {
  font-weight: 700;
  font-size: 14px;
  color: var(--text);
  margin-bottom: 4px;
}
.mistake-list p {
  font-size: 13px;
  color: var(--text-sub);
  margin: 0;
}
.notes-block {
  background: #fffaf0;
  border: 1px solid #f0d8a0;
  border-radius: 8px;
  padding: 22px 26px;
}
.notes-block h2 {
  border-left-color: #e09f00;
}

.related-card.disabled {
  pointer-events: none;
  opacity: 0.6;
}
.related-card.disabled:hover { border-color: var(--border); }
.reynolds-page .related { display: none; }

.update-archive-list {
  margin-top: 24px;
  border-top: 1px solid var(--border);
}
.update-archive-list li {
  padding: 16px 0;
}

/* ===== Profile section ===== */
.profile-section {
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  padding: 60px 0;
}
.profile-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
}
.profile-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 32px;
}
.profile-header {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 24px;
}
.profile-avatar {
  flex-shrink: 0;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
  background: #fff;
}
.profile-name-block { flex: 1; min-width: 0; }
.profile-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.profile-bio {
  margin: 0;
  line-height: 1.85;
  color: var(--text-sub);
  font-size: 14px;
}
.profile-links {
  list-style: none;
  margin: 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--border);
  display: grid;
  gap: 14px;
}
.profile-links li {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 4px 16px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.6;
}
.profile-link-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-sub);
  padding-top: 2px;
}
.profile-link {
  color: var(--brand);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.profile-link::after {
  content: " ↗";
  font-size: 0.75em;
  color: var(--text-sub);
  display: inline-block;
}
.profile-link:hover { color: var(--brand-dark); }
.profile-link-desc {
  grid-column: 2;
  font-size: 12.5px;
  color: var(--text-sub);
  line-height: 1.5;
}
@media (max-width: 640px) {
  .profile-header { flex-direction: column; align-items: center; text-align: center; }
  .profile-bio { text-align: left; }
  .profile-links li { grid-template-columns: 1fr; gap: 2px; }
  .profile-link-desc { grid-column: 1; }
}

/* ===== Doc page (about / privacy / faq / terms / disclaimer) ===== */
.doc-page {
  max-width: 820px;
  margin: 0 auto;
  padding: 32px;
}
.doc-page h1 {
  font-size: 26px;
  font-weight: 700;
  margin: 8px 0 8px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--brand);
}
.doc-page .doc-meta {
  color: var(--text-sub);
  font-size: 12px;
  margin: 0 0 28px;
}
.doc-page h2 {
  font-size: 17px;
  font-weight: 700;
  color: var(--brand);
  margin: 36px 0 12px;
  padding-left: 10px;
  border-left: 3px solid var(--brand);
}
.doc-page p {
  margin: 0 0 14px;
  font-size: 14.5px;
}
.doc-page ul {
  padding-left: 22px;
  margin: 0 0 16px;
}
.doc-page li {
  margin-bottom: 6px;
  font-size: 14px;
}
.doc-page .qa {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px 20px;
  margin-bottom: 14px;
}
.doc-page .qa .q {
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}
.doc-page .qa .q::before {
  content: "Q. ";
  color: var(--brand);
  font-weight: 700;
}
.doc-page .qa .a {
  color: var(--text-sub);
  font-size: 14px;
  margin: 0;
}
.doc-page .qa .a::before {
  content: "A. ";
  color: var(--text);
  font-weight: 700;
}
.doc-page .ext::after {
  content: " ↗";
  font-size: 11px;
  color: var(--text-sub);
}

/* ===== Responsive ===== */
@media (max-width: 1080px) {
  .cat-grid { grid-template-columns: repeat(4, 1fr); }
  .info-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { align-items: flex-start; }
}
@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; padding: 48px 20px 64px; min-height: auto; }
  .hero-bg { opacity: 0.25; }
  .hero h1 { font-size: 32px; }
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .tool-layout { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .site-nav { display: none; }
  .footer-inner { grid-template-columns: 1fr; }
  .section { padding: 40px 20px; }
  .info-grid { padding: 0 20px; }
}

/* ===== Share Buttons — Floating side bar ===== */
.share-buttons {
  position: fixed;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 900;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.share-buttons.visible {
  opacity: 1;
  pointer-events: auto;
}

.share-buttons__label {
  font-family: "SF Mono", Consolas, monospace;
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #999;
  text-align: center;
  margin-bottom: 4px;
}

.share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: all 0.3s ease;
  color: var(--text-sub);
  cursor: pointer;
  text-decoration: none;
}

.share-btn:hover {
  transform: scale(1.15);
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  text-decoration: none;
}

.share-btn img {
  width: 22px;
  height: 22px;
  object-fit: contain;
  border-radius: 4px;
  pointer-events: none;
}

/* X (Twitter) */
.share-btn--x { color: #000000; }
.share-btn--x:hover {
  background: #000000;
  border-color: #000000;
  color: #ffffff;
}

/* note */
.share-btn--note { color: #41C9B4; }
.share-btn--note:hover {
  background: #41C9B4;
  border-color: #41C9B4;
  color: #ffffff;
}

/* LINE */
.share-btn--line { color: #06C755; }
.share-btn--line:hover {
  background: #06C755;
  border-color: #06C755;
  color: #ffffff;
}

/* Facebook */
.share-btn--facebook { color: #1877F2; }
.share-btn--facebook:hover {
  background: #1877F2;
  border-color: #1877F2;
  color: #ffffff;
}

/* Tooltip */
.share-btn[data-tooltip] {
  position: relative;
}

.share-btn[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  left: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--text);
  color: #fff;
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.7rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.share-btn[data-tooltip]:hover::after {
  opacity: 1;
}

/* Tablet: smaller buttons */
@media (max-width: 1200px) {
  .share-buttons { left: 12px; }
  .share-btn { width: 38px; height: 38px; }
  .share-btn img { width: 17px; height: 17px; }
  .share-buttons__label { display: none; }
  .share-btn[data-tooltip]::after { display: none; }
}

/* Mobile: bottom fixed bar */
@media (max-width: 768px) {
  .share-buttons {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    transform: none;
    flex-direction: row;
    justify-content: center;
    gap: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border);
    padding: 10px 16px;
    box-shadow: 0 -2px 16px rgba(0, 0, 0, 0.06);
  }

  .share-buttons__label { display: none; }

  .share-btn {
    width: 44px;
    height: 44px;
    border: none;
    box-shadow: none;
    border-radius: 8px;
    background: transparent;
    flex: 1;
    max-width: 80px;
  }

  .share-btn:hover {
    transform: none;
    box-shadow: none;
  }

  .share-btn img { width: 22px; height: 22px; }

  /* Add padding to footer so it's not hidden behind share bar */
  .site-footer { padding-bottom: 64px; }
}