/* ============================================================
   Pet Age Calculator — Global Stylesheet
   Design system A (Natural / Calm): #2F7D6D primary, #F4A261 accent
   Mobile-first. Inter / system font stack.
   ============================================================ */

:root {
  --color-primary: #2F7D6D;
  --color-primary-dark: #245F54;
  --color-primary-soft: #DCEFE9;
  --color-accent: #F4A261;
  --color-accent-dark: #B96525;
  --color-bg: #F7FAF8;
  --color-surface: #FFFFFF;
  --color-surface-muted: #EEF5F2;
  --color-text: #20312E;
  --color-text-muted: #5E716C;
  --color-border: #D6E4DF;
  --color-danger: #B94A48;
  --color-focus: #F4A261;
  --radius-card: 16px;
  --radius-input: 10px;
  --radius-pill: 999px;
  --shadow-card: 0 8px 24px rgba(32, 49, 46, 0.06);
  --shadow-card-hover: 0 12px 28px rgba(32, 49, 46, 0.10);
  --container: 1120px;
  --read-width: 760px;
  --header-h: 72px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }

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

h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 16px; font-weight: 700; }
h1 { font-size: 34px; font-weight: 750; letter-spacing: -0.02em; }
h2 { font-size: 26px; letter-spacing: -0.01em; }
h3 { font-size: 19px; }
p { margin: 0 0 16px; }
ul, ol { margin: 0 0 16px; padding-left: 22px; }
li { margin-bottom: 6px; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 16px; }
.container-narrow { max-width: var(--read-width); margin: 0 auto; padding: 0 16px; }

/* ---------------------------------------------------------- header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}
.logo:hover { color: var(--color-text); text-decoration: none; }
.logo svg { color: var(--color-primary); flex-shrink: 0; }

.main-nav ul {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 24px;
}
.main-nav a {
  color: var(--color-text-muted);
  font-size: 15px;
  font-weight: 600;
  padding: 6px 2px;
  border-bottom: 3px solid transparent;
}
.main-nav a:hover { color: var(--color-primary); text-decoration: none; }
.main-nav a.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }

/* Dropdown menu styles */
.main-nav li { position: relative; }
.main-nav .dropdown-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}
.main-nav .dropdown-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform 0.2s ease;
}
.main-nav .dropdown-toggle:hover svg {
  transform: translateY(2px);
}
.main-nav .dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-input);
  box-shadow: var(--shadow-card);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 0.2s ease;
  z-index: 150;
}
.main-nav li:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.main-nav .dropdown-menu a {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: none;
}
.main-nav .dropdown-menu a:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}
.main-nav .dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: 8px 0;
}

/* CTA Button in nav */
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-primary);
  color: #fff !important;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 14px;
  border-bottom: none;
  transition: all 0.2s ease;
}
.nav-cta:hover {
  background: var(--color-primary-dark);
  text-decoration: none !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(47, 125, 109, 0.25);
}

.menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-input);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
}
.menu-btn:hover { background: var(--color-surface-muted); }
.menu-btn:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 2px; }

.mobile-nav {
  position: fixed;
  inset: 0 0 0 auto;
  width: min(320px, 85vw);
  background: var(--color-surface);
  box-shadow: -8px 0 32px rgba(32, 49, 46, 0.12);
  transform: translateX(100%);
  transition: transform 0.25s ease;
  z-index: 200;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.mobile-nav.open { transform: translateX(0); }
.mobile-nav .close-btn {
  align-self: flex-end;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  font-size: 22px;
  cursor: pointer;
  color: var(--color-text);
}
.mobile-nav a {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  padding: 12px 8px;
  border-radius: var(--radius-input);
}
.mobile-nav a:hover { background: var(--color-surface-muted); text-decoration: none; }

/* Mobile nav collapsible sections */
.mobile-nav-section { margin-top: 8px; }
.mobile-nav-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  background: transparent;
  border: none;
  border-radius: var(--radius-input);
  cursor: pointer;
  font-family: inherit;
}
.mobile-nav-toggle:hover { background: var(--color-surface-muted); }
.mobile-nav-toggle svg {
  transition: transform 0.2s ease;
}
.mobile-nav-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}
.mobile-nav-links {
  display: none;
  padding-left: 16px;
  margin-bottom: 8px;
}
.mobile-nav-links.open { display: block; }
.mobile-nav-links a {
  display: block;
  font-size: 15px;
  font-weight: 500;
  padding: 10px 8px;
  color: var(--color-text-muted);
}
.mobile-nav-links a:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}
.mobile-nav-divider {
  height: 1px;
  background: var(--color-border);
  margin: 16px 0;
}
.nav-cta-mobile {
  display: block;
  text-align: center;
  background: var(--color-primary);
  color: #fff !important;
  padding: 14px !important;
  border-radius: var(--radius-input);
  font-weight: 600;
  margin-bottom: 16px;
}
.nav-cta-mobile:hover {
  background: var(--color-primary-dark) !important;
  text-decoration: none !important;
}
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(32, 49, 46, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 150;
}
.nav-overlay.show { opacity: 1; pointer-events: auto; }

@media (min-width: 960px) {
  .main-nav ul { display: flex; }
  .menu-btn { display: none; }
}

/* ---------------------------------------------------------- hero */

.hero {
  background: var(--color-primary-soft);
  padding: 40px 0 48px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}
@media (min-width: 960px) {
  .hero-grid { grid-template-columns: 52% 48%; gap: 48px; }
}
.hero h1 { margin-bottom: 14px; }
.hero .lead {
  font-size: 17px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}
.hero .jump-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

/* species icon row */
.hero-species {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.hero-species a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
}
.hero-species a:hover { border-color: var(--color-primary); color: var(--color-primary); text-decoration: none; }
.hero-species svg { flex-shrink: 0; }

/* ---------------------------------------------------------- calculator card */

.calc-card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 24px;
  border-top: 4px solid var(--color-accent);
  max-width: 460px;
  margin: 0 auto;
  width: 100%;
}
@media (min-width: 640px) { .calc-card { padding: 32px; } }

.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 15px;
  font-weight: 650;
  margin-bottom: 6px;
}
.field .hint { font-size: 13px; color: var(--color-text-muted); margin-top: 4px; }

.field select,
.field input[type="number"] {
  width: 100%;
  height: 48px;
  border: 1px solid #BFD3CD;
  border-radius: var(--radius-input);
  background: var(--color-surface);
  padding: 0 14px;
  font-size: 16px;
  color: var(--color-text);
  font-family: inherit;
  -webkit-appearance: none;
  appearance: none;
}
.field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16' fill='none' stroke='%235E716C' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M3 6l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
}
.field input:focus-visible,
.field select:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-focus);
}
.field input.error,
.field select.error { border-color: var(--color-danger); }
.error-msg { display: none; color: var(--color-danger); font-size: 14px; margin-top: 6px; }
.field.invalid .error-msg { display: block; }

.age-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* segmented control (dog size / bird type) */
.segmented {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.segmented button {
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-input);
  background: var(--color-surface);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  font-family: inherit;
  padding: 0 6px;
}
.segmented button:hover { border-color: var(--color-primary); }
.segmented button.selected {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}
.segmented button:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 2px; }

.calc-btn {
  width: 100%;
  height: 48px;
  border: none;
  border-radius: var(--radius-input);
  background: var(--color-primary);
  color: #fff;
  font-size: 16px;
  font-weight: 650;
  cursor: pointer;
  font-family: inherit;
  margin-top: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.15s ease, box-shadow 0.15s ease;
}
.calc-btn:hover { background: var(--color-primary-dark); box-shadow: var(--shadow-card); }
.calc-btn:active { transform: scale(0.98); }
.calc-btn:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 2px; }
.calc-btn:disabled { background: #B8CCC6; color: var(--color-text-muted); cursor: not-allowed; transform: none; }

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: none;
}
.calc-btn.loading .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------------------------------------------------- result card */

.result-card {
  margin-top: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  padding: 20px;
  animation: fadeIn 0.3s ease;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.result-label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}
.result-main {
  font-size: 44px;
  font-weight: 750;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--color-text);
  margin-bottom: 10px;
}
.result-main .approx { font-size: 20px; font-weight: 400; color: var(--color-text-muted); }

.stage-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.stage-badge {
  display: inline-flex;
  align-items: center;
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-size: 14px;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
}
.stage-desc { font-size: 15px; color: var(--color-text-muted); }

.result-info {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 16px;
}
@media (min-width: 640px) {
  .result-info { grid-template-columns: repeat(3, 1fr); }
}
.info-block {
  background: var(--color-surface-muted);
  border-radius: 12px;
  padding: 12px 14px;
}
.info-block .k { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-muted); margin-bottom: 4px; }
.info-block .v { font-size: 15px; font-weight: 600; }

.tips-list { margin: 16px 0 0; padding: 0; list-style: none; }
.tips-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 15px;
}
.tips-list li:last-child { border-bottom: none; }
.tips-list .check { color: var(--color-primary); flex-shrink: 0; margin-top: 2px; }

.tips-title {
  font-size: 15px;
  font-weight: 700;
  margin: 18px 0 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chart-wrap { margin-top: 18px; }
.chart-wrap svg { width: 100%; height: auto; display: block; }
.chart-caption { font-size: 13px; color: var(--color-text-muted); margin-top: 6px; text-align: center; }

.result-disclaimer {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-text-muted);
  background: var(--color-surface-muted);
  border-radius: 10px;
  padding: 10px 12px;
}

/* ---------------------------------------------------------- sections */

.section { padding: 48px 0; }
.section-alt { background: var(--color-surface); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.section-head { margin-bottom: 28px; }

.breadcrumb {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .sep { margin: 0 6px; color: var(--color-border); }

/* cards grid */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 640px) { .card-grid.cols-2 { grid-template-columns: repeat(2, 1fr); } .card-grid.cols-4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .card-grid.cols-4 { grid-template-columns: repeat(4, 1fr); } .card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); } }

.icon-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 22px;
  box-shadow: var(--shadow-card);
}
.icon-card h3 { font-size: 17px; margin-bottom: 8px; }
.icon-card p { font-size: 15px; color: var(--color-text-muted); margin: 0; }
.icon-card .ico { color: var(--color-primary); margin-bottom: 10px; display: inline-flex; }

/* steps */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  counter-reset: step;
}
@media (min-width: 640px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.step-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px;
  position: relative;
}
.step-num {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  margin-bottom: 12px;
}
.step-card h3 { font-size: 16px; margin-bottom: 6px; }
.step-card p { font-size: 14px; color: var(--color-text-muted); margin: 0; }

/* species links */
.species-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
@media (min-width: 640px) { .species-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .species-grid { grid-template-columns: repeat(4, 1fr); } }
.species-card {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 18px;
  color: var(--color-text);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}
.species-card:hover { box-shadow: var(--shadow-card-hover); border-color: var(--color-primary); text-decoration: none; color: var(--color-text); }
.species-card .ico { color: var(--color-primary); flex-shrink: 0; }
.species-card h3 { font-size: 16px; margin: 0 0 4px; }
.species-card p { font-size: 14px; color: var(--color-text-muted); margin: 0; line-height: 1.5; }
.species-card .arrow { margin-left: auto; color: var(--color-text-muted); flex-shrink: 0; }

/* tables */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; border-radius: 12px; border: 1px solid var(--color-border); }
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  font-size: 15px;
  min-width: 520px;
}
th {
  background: var(--color-surface-muted);
  color: var(--color-text);
  font-weight: 700;
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}
td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--color-border);
  font-variant-numeric: tabular-nums;
}
tbody tr:hover { background: var(--color-surface-muted); }
tbody tr:last-child td { border-bottom: none; }
td.num, th.num { text-align: right; }

/* tabs for size charts */
.chart-tabs { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.chart-tabs button {
  height: 40px;
  padding: 0 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-input);
  background: var(--color-surface);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  font-family: inherit;
}
.chart-tabs button.selected { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.chart-tabs button:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 2px; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* callouts */
.callout {
  background: var(--color-primary-soft);
  border-radius: 12px;
  padding: 16px 18px;
  margin: 20px 0;
  font-size: 15px;
}
.callout strong { color: var(--color-primary-dark); }
.callout-note {
  border-left: 4px solid var(--color-accent);
  background: var(--color-surface);
  border-radius: 0 12px 12px 0;
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 15px;
}
.callout-note strong { color: var(--color-accent-dark); }

/* FAQ accordion */
.faq-list details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  margin-bottom: 10px;
  padding: 0 18px;
}
.faq-list summary {
  cursor: pointer;
  font-weight: 650;
  font-size: 16px;
  padding: 16px 0;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  font-size: 22px;
  color: var(--color-primary);
  flex-shrink: 0;
  line-height: 1;
}
.faq-list details[open] summary::after { content: "–"; }
.faq-list details[open] { box-shadow: var(--shadow-card); }
.faq-list .faq-a { padding: 0 0 16px; color: var(--color-text-muted); font-size: 15px; }
.faq-list .faq-a p:last-child { margin-bottom: 0; }

/* on-page toc */
.toc { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 12px; padding: 16px 18px; margin-bottom: 28px; }
.toc summary { cursor: pointer; font-weight: 700; font-size: 15px; }
.toc ol { margin: 12px 0 0; padding-left: 20px; font-size: 14px; }
.toc a { color: var(--color-text-muted); }
.toc a:hover { color: var(--color-primary); }

/* guide layout */
.guide-body { max-width: var(--read-width); margin: 0 auto; padding: 0 16px; }
.guide-body h2 { margin-top: 40px; }
.guide-body h3 { margin-top: 28px; }
.article-meta { font-size: 13px; color: var(--color-text-muted); margin-bottom: 24px; }

/* cta band */
.cta-band {
  background: var(--color-primary);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  color: #fff;
  text-align: center;
  margin: 40px 0;
}
.cta-band h2 { color: #fff; margin-bottom: 8px; }
.cta-band p { color: rgba(255, 255, 255, 0.9); margin-bottom: 18px; }
.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-surface);
  color: var(--color-primary);
  font-weight: 700;
  font-size: 16px;
  padding: 13px 26px;
  border-radius: var(--radius-input);
}
.cta-btn:hover { background: var(--color-primary-soft); text-decoration: none; }

/* ---------------------------------------------------------- footer */

.site-footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.85);
  padding: 48px 0 32px;
  margin-top: 48px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 28px;
}
@media (min-width: 960px) { .footer-grid { grid-template-columns: repeat(4, 1fr); } }
.site-footer h3 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: rgba(255, 255, 255, 0.75); font-size: 14px; }
.site-footer a:hover { color: #fff; text-decoration: none; }
.footer-note {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 20px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
@media (min-width: 640px) { .footer-note { flex-direction: row; justify-content: space-between; } }

/* ---------------------------------------------------------- misc */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 10px 16px;
  z-index: 300;
}
.skip-link:focus { left: 0; }

.fun-badge {
  display: inline-flex;
  background: var(--color-accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.quick-facts { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-card); padding: 18px; margin: 24px 0; }
.quick-facts h3 { font-size: 15px; margin-bottom: 10px; }
.quick-facts ul { margin: 0; padding-left: 18px; font-size: 14px; color: var(--color-text-muted); }
.quick-facts li { margin-bottom: 6px; }

.formula-box {
  background: var(--color-text);
  color: #fff;
  border-radius: 12px;
  padding: 14px 18px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 15px;
  margin: 16px 0;
  overflow-x: auto;
  white-space: nowrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 44px;
  padding: 0 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-input);
  background: var(--color-surface);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  font-family: inherit;
}
.share-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.share-btn:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 2px; }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--color-text);
  color: #fff;
  padding: 12px 22px;
  border-radius: var(--radius-input);
  font-size: 15px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 400;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* print */
@media print {
  .site-header, .site-footer, .calc-card, .cta-band, .no-print { display: none !important; }
  body { background: #fff; }
  .section-alt { background: #fff; border: none; }
  table { min-width: 0; }
  .table-scroll { border: none; }
}

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .result-card { animation: none; }
}