/* Common styles shared across all calculator pages */
/* Per-page accent: set --accent, --accent-hover, --accent-shadow in a page <style> block */

:root {
  /* Surfaces & neutrals */
  --surface-bg-start: #f6f8fc;
  --surface-bg-end: #eef2f8;
  --surface-card: #ffffff;
  --surface-muted: #f8fafc;
  --border-subtle: #e6e9ef;
  --border-default: #e2e6ee;
  --text-strong: #0f172a;
  --text-default: #1f2937;
  --text-muted: #5b6472;
  --text-soft: #8892a0;

  /* Shadow layers */
  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px -12px rgba(15, 23, 42, 0.1);
  --shadow-card-hover: 0 2px 4px rgba(15, 23, 42, 0.05), 0 14px 32px -12px rgba(15, 23, 42, 0.15);
  --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.6);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-pill: 999px;

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 120ms;
  --dur-base: 200ms;
  --dur-slow: 320ms;
}

* { box-sizing: border-box; }

/* Skip-to-content link (accessibility) */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: 100;
  padding: 12px 24px;
  background: var(--accent, #2563eb);
  color: white;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 8px 8px;
}

.skip-link:focus {
  position: fixed;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  width: auto;
  height: auto;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(180deg, var(--surface-bg-start) 0%, var(--surface-bg-end) 100%);
  background-attachment: fixed;
  color: var(--text-default);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px;
  position: relative;
}

header {
  text-align: center;
  margin-bottom: 36px;
  padding: 8px 4px 0;
}

/* Category kicker — signals page family above H1 */
.category-kicker {
  display: inline-block;
  margin: 0 0 10px 0;
  padding: 0;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.4px;
  color: var(--accent, #2563eb);
  position: relative;
}

.category-kicker::after {
  content: "";
  display: inline-block;
  vertical-align: middle;
  width: 24px;
  height: 1.5px;
  background: currentColor;
  opacity: 0.4;
  margin-left: 10px;
  transform: translateY(-2px);
}

h1 {
  font-size: clamp(30px, 4.2vw, 42px);
  font-weight: 800;
  margin: 0 0 14px 0;
  color: var(--text-strong);
  letter-spacing: -0.8px;
  line-height: 1.15;
}

header p {
  color: var(--text-muted);
  font-size: 17px;
  margin: 0 auto;
  max-width: 560px;
  line-height: 1.55;
}

/* Hero badges (pill row under header <p>) */
.hero-badges {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin: 16px 0 0 0;
  padding: 0;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 11px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1px;
  color: var(--accent, #2563eb);
  background: color-mix(in srgb, var(--accent, #2563eb) 10%, white);
  border: 1px solid color-mix(in srgb, var(--accent, #2563eb) 20%, transparent);
  border-radius: var(--radius-pill);
  line-height: 1.2;
}

.pill::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent, #2563eb);
  opacity: 0.75;
}

/* Card */
.card {
  background: var(--surface-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-subtle);
  margin-bottom: 24px;
}

.card label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: #374151;
  font-size: 14.5px;
  letter-spacing: 0.1px;
}

.card input[type="date"] {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  color: var(--text-strong);
  background: var(--surface-card);
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}

.card input[type="date"]:hover {
  border-color: #c6ccd7;
}

.card input[type="date"]:focus {
  border-color: var(--accent, #2563eb);
  box-shadow: 0 0 0 4px var(--accent-shadow, rgba(37, 99, 235, 0.18));
}

.card button {
  width: 100%;
  padding: 15px 18px;
  font-size: 17px;
  font-weight: 650;
  margin-top: 16px;
  color: white;
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--accent, #2563eb) 92%, white) 0%,
    var(--accent, #2563eb) 100%);
  border: 1px solid color-mix(in srgb, var(--accent, #2563eb) 85%, #000);
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: var(--shadow-inset),
              0 1px 2px color-mix(in srgb, var(--accent, #2563eb) 25%, transparent);
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out),
              filter var(--dur-base) var(--ease-out);
  letter-spacing: 0.1px;
}

.card button:hover {
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--accent-hover, #1d4ed8) 92%, white) 0%,
    var(--accent-hover, #1d4ed8) 100%);
  box-shadow: var(--shadow-inset),
              0 6px 16px -4px color-mix(in srgb, var(--accent, #2563eb) 45%, transparent);
  transform: translateY(-1px);
}

.card button:active {
  transform: translateY(0) scale(0.99);
  filter: brightness(0.97);
}

.card button:focus-visible {
  outline: 2px solid var(--accent, #2563eb);
  outline-offset: 3px;
}

/* Result */
.result {
  margin-top: 28px;
  text-align: center;
  animation: fadeInUp var(--dur-slow) var(--ease-out);
}

/* Empty state — prompts the user before they interact */
.result:empty {
  animation: none;
  margin-top: 24px;
  padding: 22px 16px;
  background: var(--surface-muted);
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
}

.result:empty::before {
  content: attr(data-empty);
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-number,
.result-main {
  font-size: clamp(48px, 8vw, 64px);
  font-weight: 800;
  color: var(--accent, #2563eb);
  line-height: 1;
  letter-spacing: -1.5px;
  font-variant-numeric: tabular-nums;
  text-wrap: balance;
}

.result-label {
  font-size: 17px;
  color: var(--text-muted);
  margin-top: 8px;
  letter-spacing: 0.1px;
}

/* Navigation — two-tier: category chips (top) + sibling tools (bottom) */
.tools-nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0 -4px 28px;
  padding: 6px 4px;
  position: relative;
}

.nav-categories,
.nav-siblings {
  display: flex;
  gap: 8px;
  flex-wrap: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
  justify-content: center;
  padding: 2px 4px;
  mask-image: linear-gradient(to right, transparent 0, #000 24px, #000 calc(100% - 24px), transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0, #000 24px, #000 calc(100% - 24px), transparent 100%);
}

.nav-categories::-webkit-scrollbar,
.nav-siblings::-webkit-scrollbar { display: none; }

/* Desktop / wide screens: wrap instead of horizontal scroll — mouse users
   have no way to scroll a no-scrollbar track horizontally. */
@media (min-width: 720px) {
  .nav-categories,
  .nav-siblings {
    flex-wrap: wrap;
    overflow-x: visible;
    row-gap: 10px;
    mask-image: none;
    -webkit-mask-image: none;
  }
}

/* Tier 1: category chips — compact, uppercase */
.nav-cat {
  padding: 7px 14px;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  scroll-snap-align: start;
  transition: background var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
}

.nav-cat:hover {
  color: var(--text-default);
  background: var(--surface-muted);
}

.nav-cat.active {
  color: var(--accent, #2563eb);
  background: color-mix(in srgb, var(--accent, #2563eb) 10%, var(--surface-card));
  border-color: color-mix(in srgb, var(--accent, #2563eb) 25%, transparent);
}

/* Tier 2: sibling tool pills (inherit from existing .tools-nav a pattern) */
.nav-siblings a {
  padding: 9px 14px;
  background: var(--surface-card);
  border-radius: var(--radius-pill);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 550;
  border: 1px solid var(--border-subtle);
  transition: background var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
  white-space: nowrap;
  flex-shrink: 0;
  scroll-snap-align: start;
}

.nav-siblings .nav-more {
  color: var(--accent, #2563eb);
  font-weight: 650;
  border-color: color-mix(in srgb, var(--accent, #2563eb) 25%, transparent);
  background: color-mix(in srgb, var(--accent, #2563eb) 6%, var(--surface-card));
}

/* Legacy fallback — keep old single-row nav working during rollout */
.tools-nav > a {
  padding: 9px 14px;
  background: var(--surface-card);
  border-radius: var(--radius-pill);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 550;
  border: 1px solid var(--border-subtle);
  transition: background var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
  white-space: nowrap;
  flex-shrink: 0;
}

.tools-nav a:hover,
.nav-siblings a:hover {
  background: #f1f4f9;
  color: var(--text-default);
  border-color: #d4d9e2;
}

.tools-nav a.active,
.nav-siblings a.active {
  background: var(--accent, #2563eb);
  color: white;
  border-color: var(--accent, #2563eb);
  box-shadow: 0 2px 8px -2px color-mix(in srgb, var(--accent, #2563eb) 55%, transparent);
}

.tools-nav a:focus-visible,
.nav-siblings a:focus-visible,
.nav-cat:focus-visible {
  outline: 2px solid var(--accent, #2563eb);
  outline-offset: 2px;
}

/* Theme toggle button — top-right floating */
.theme-toggle {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 36px;
  height: 36px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-card);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  border-radius: 50%;
  cursor: pointer;
  z-index: 10;
  transition: background var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  box-shadow: var(--shadow-card);
}

.theme-toggle:hover {
  color: var(--accent, #2563eb);
  border-color: color-mix(in srgb, var(--accent, #2563eb) 30%, var(--border-default));
  transform: translateY(-1px);
}

.theme-toggle:active { transform: translateY(0) scale(0.95); }

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent, #2563eb);
  outline-offset: 2px;
}

.theme-toggle svg { width: 18px; height: 18px; }

/* Icon visibility: moon = "switch to dark", sun = "switch to light" */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  html:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

html[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

html[data-theme="light"] .theme-toggle .icon-sun { display: none; }
html[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* Content sections */
.section {
  margin-top: 52px;
}

h2 {
  font-size: 26px;
  font-weight: 750;
  margin: 0 0 18px 0;
  color: var(--text-strong);
  letter-spacing: -0.4px;
  line-height: 1.25;
  padding-left: 16px;
  border-left: 4px solid var(--accent, #2563eb);
  text-align: left;
}

/* Example callout — concrete, bordered box for sample calculations */
.example-callout {
  margin: 20px 0;
  padding: 16px 18px;
  background: color-mix(in srgb, var(--accent, #2563eb) 6%, var(--surface-card));
  border: 1px solid color-mix(in srgb, var(--accent, #2563eb) 20%, transparent);
  border-left: 4px solid var(--accent, #2563eb);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-default);
  font-size: 15px;
  line-height: 1.55;
}

.example-callout strong {
  color: var(--text-strong);
  font-weight: 700;
  letter-spacing: 0.1px;
}

.example-callout .arrow {
  color: var(--accent, #2563eb);
  font-weight: 700;
  margin: 0 6px;
}

.section p {
  color: #4b5563;
  margin: 0 0 16px 0;
  line-height: 1.7;
}

.section ul {
  color: #4b5563;
  padding-left: 20px;
  margin: 0 0 16px 0;
}

.section li {
  margin-bottom: 10px;
  line-height: 1.7;
}

/* FAQ */
.faq-item {
  margin-bottom: 16px;
  padding: 22px 24px;
  background: var(--surface-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
  transition: border-color var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}

.faq-item:hover {
  border-color: #d4d9e2;
  box-shadow: 0 4px 14px -6px rgba(15, 23, 42, 0.1);
}

.faq-item h3 {
  font-size: 17px;
  font-weight: 650;
  margin: 0 0 10px 0;
  color: var(--text-strong);
  letter-spacing: -0.15px;
  line-height: 1.4;
}

.faq-item p {
  margin: 0;
  color: #4b5563;
  line-height: 1.7;
}

/* Ad block (legacy) */
.ad-block {
  background: #f3f4f6;
  border: 1px dashed #d1d5db;
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  color: #9ca3af;
  margin: 32px 0;
}

/* Ad container (improved) */
.ad-container {
  background: #fafafa;
  border-radius: 12px;
  padding: 24px 16px;
  text-align: center;
  color: #9ca3af;
  margin: 32px 0;
  min-height: 100px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  position: relative;
}

.ad-container::before {
  content: "Sponsored";
  display: block;
  font-size: 11px;
  color: #b0b0b0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.ad-container--in-article,
.ad-in-article {
  min-height: 250px;
  margin: 24px 0;
}

.ad-container--bottom {
  min-height: 90px;
  margin: 32px 0 0;
}

/* Related tools */
.related-tools {
  margin-top: 32px;
  padding: 24px;
  background: var(--surface-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
}

.related-tools p {
  font-weight: 700;
  color: var(--text-strong);
  margin: 0 0 14px 0;
  font-size: 15px;
  letter-spacing: -0.1px;
}

.related-tools ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.related-tools li {
  margin-bottom: 0;
}

.related-tools a {
  color: var(--text-default);
  text-decoration: none;
  display: block;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--surface-muted);
  border: 1px solid var(--border-subtle);
  font-weight: 550;
  font-size: 14px;
  transition: border-color var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}

.related-tools a:hover {
  background: var(--accent, #2563eb);
  color: white;
  border-color: var(--accent, #2563eb);
  text-decoration: none;
  transform: translateY(-1px);
}

/* Calculator hub grid (homepage "All Calculators" section) */
.calc-hub {
  margin-top: 48px;
}

.calc-hub-subtitle {
  color: #6b7280;
  margin: 0 0 24px 0;
  font-size: 15px;
}

.calc-hub-group {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.4px;
  color: var(--text-muted);
  margin: 32px 0 12px 0;
  padding: 0 0 8px 0;
  border-bottom: 1px solid var(--border-subtle);
  scroll-margin-top: 16px;
}

.calc-hub-group:first-of-type { margin-top: 0; }

.calc-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.calc-grid > li {
  margin: 0;
}

.calc-card {
  --card-accent: var(--accent, #2563eb);
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 18px 18px 20px;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  text-decoration: none;
  color: #1f2937;
  transition: transform 0.15s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
}

.calc-card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--card-accent) 12%, white);
  color: var(--card-accent);
  margin-bottom: 2px;
}

.calc-card-icon svg {
  width: 22px;
  height: 22px;
}

.calc-card-title {
  font-size: 16px;
  font-weight: 700;
  color: #111827;
  letter-spacing: -0.1px;
  transition: color 0.2s ease;
}

.calc-card-tagline {
  font-size: 13.5px;
  color: #6b7280;
  line-height: 1.45;
}

.calc-card:hover,
.calc-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--card-accent);
  box-shadow: 0 8px 22px -10px color-mix(in srgb, var(--card-accent) 55%, transparent);
  outline: none;
}

.calc-card:hover .calc-card-title,
.calc-card:focus-visible .calc-card-title {
  color: var(--card-accent);
}

.calc-card:focus-visible {
  outline: 2px solid var(--card-accent);
  outline-offset: 2px;
}

/* Tablet: 2 columns */
@media (max-width: 768px) {
  .calc-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Share button */
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding: 10px 18px;
  background: color-mix(in srgb, var(--accent, #2563eb) 10%, white);
  color: var(--accent, #2563eb);
  border: 1px solid color-mix(in srgb, var(--accent, #2563eb) 25%, transparent);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  min-height: 40px;
  letter-spacing: 0.1px;
}

.share-btn:hover {
  background: var(--accent, #2563eb);
  color: white;
  border-color: var(--accent, #2563eb);
  box-shadow: 0 6px 14px -6px color-mix(in srgb, var(--accent, #2563eb) 60%, transparent);
  transform: translateY(-1px);
}

.share-btn:active {
  transform: translateY(0) scale(0.97);
}

.share-btn:focus-visible {
  outline: 2px solid var(--accent, #2563eb);
  outline-offset: 2px;
}

.share-btn.copied {
  background: #059669;
  color: white;
  border-color: #059669;
}

.share-btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Result details grid (used by age, weeks-since, months-since, years-since, days-until, workdays, christmas, birthday) */
.result-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 26px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.detail-item {
  text-align: center;
  padding: 14px 8px;
  background: var(--surface-muted);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.detail-number {
  font-size: 24px;
  font-weight: 750;
  color: var(--text-strong);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.3px;
}

.detail-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  margin-top: 4px;
  font-weight: 600;
}

/* Result grid with background items (used by date-difference, dday, add-days) */
.result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 26px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.result-item {
  background: var(--surface-muted);
  padding: 18px;
  border-radius: var(--radius-md);
  text-align: center;
  border: 1px solid var(--border-subtle);
}

.result-item-number {
  font-size: 28px;
  font-weight: 750;
  color: var(--text-strong);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.4px;
}

.result-item-label {
  font-size: 13.5px;
  color: var(--text-muted);
  margin-top: 4px;
  letter-spacing: 0.1px;
}

/* Input row layout (used by dday, add-days, date-difference, workdays) */
.input-row,
.date-inputs,
.date-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.input-group,
.date-group {
  display: flex;
  flex-direction: column;
}

/* Additional input type styles */
.card input[type="text"],
.card input[type="number"] {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  color: var(--text-strong);
  background: var(--surface-card);
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}

.card input[type="text"]:hover,
.card input[type="number"]:hover {
  border-color: #c6ccd7;
}

.card input[type="text"]:focus,
.card input[type="number"]:focus {
  border-color: var(--accent, #2563eb);
  box-shadow: 0 0 0 4px var(--accent-shadow, rgba(37, 99, 235, 0.18));
}

/* Quick date/range preset buttons */
/* Quick-dates chip row — sits ABOVE the input as a "Try:" shortcut.
   Legacy usage below the CTA still works (pages that haven't been restructured yet). */
.quick-dates,
.quick-ranges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin: 0 0 18px 0;
  padding: 0;
  border-top: none;
}

/* "Try:" label prefix rendered via CSS — keeps HTML semantic-free */
.quick-dates::before,
.quick-ranges::before {
  content: "Try:";
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-soft);
  margin-right: 4px;
  align-self: center;
}

.quick-dates button,
.quick-ranges button {
  padding: 9px 14px;
  font-size: 13.5px;
  font-weight: 600;
  background: var(--surface-muted);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  margin-top: 0;
  width: auto;
  box-shadow: none;
  transition: background var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}

.quick-dates button:hover,
.quick-ranges button:hover {
  background: var(--accent, #2563eb);
  color: white;
  border-color: var(--accent, #2563eb);
  transform: translateY(-1px);
  filter: none;
}

.quick-dates button:active,
.quick-ranges button:active {
  transform: translateY(0) scale(0.97);
}

.quick-dates button:focus-visible,
.quick-ranges button:focus-visible {
  outline: 2px solid var(--accent, #2563eb);
  outline-offset: 2px;
}

/* Countdown timer (used by christmas, birthday pages) */
.countdown-display {
  margin: 24px 0;
}

.result-date {
  font-size: 15px;
  color: var(--text-soft);
  margin-top: 6px;
  letter-spacing: 0.1px;
}

.live-timer {
  font-size: 32px;
  font-weight: 650;
  margin-top: 14px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 2px;
  color: var(--text-strong);
}

.live-timer-label {
  font-size: 12px;
  color: var(--text-soft);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  font-weight: 600;
}

/* Event name display (used by dday calculator) */
.event-name-display {
  font-size: 16px;
  color: #374151;
  margin-top: 12px;
  font-weight: 500;
}

/* Responsive: collapse input rows and result grids on mobile */
@media (max-width: 500px) {
  .container {
    padding: 20px 16px;
  }

  header {
    margin-bottom: 28px;
  }

  header p {
    font-size: 15.5px;
  }

  .card {
    padding: 22px 18px;
    border-radius: var(--radius-md);
  }

  h2 {
    font-size: 22px;
    padding-left: 12px;
    border-left-width: 3px;
  }

  .category-kicker {
    font-size: 11px;
    letter-spacing: 1.2px;
  }

  .example-callout {
    padding: 14px 16px;
    font-size: 14px;
  }

  .card input[type="date"],
  .card input[type="text"],
  .card input[type="number"] {
    padding: 14px 16px;
    font-size: 16px;
    min-height: 48px;
  }

  .card button {
    padding: 15px;
    font-size: 16px;
    min-height: 48px;
  }

  .input-row,
  .date-inputs,
  .date-row {
    grid-template-columns: 1fr;
  }

  .result-grid {
    grid-template-columns: 1fr;
  }

  .result-details {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .detail-item {
    padding: 10px 4px;
  }

  .detail-number { font-size: 20px; }

  /* Navigation: tighter on mobile, keep scroll snap */
  .tools-nav a {
    padding: 9px 13px;
    font-size: 13px;
    flex-shrink: 0;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
  }

  /* Quick dates: wrap on mobile */
  .quick-dates,
  .quick-ranges {
    flex-wrap: wrap;
    gap: 8px;
  }

  .quick-dates button,
  .quick-ranges button {
    min-height: 44px;
    padding: 10px 14px;
  }

  /* Related tools: single column on mobile */
  .related-tools ul {
    grid-template-columns: 1fr;
  }

  .related-tools a {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  /* FAQ items spacing */
  .faq-item {
    padding: 16px 20px;
  }

  /* Ad container full width on mobile */
  .ad-container {
    margin-left: -16px;
    margin-right: -16px;
    border-radius: 0;
    padding: 24px 16px;
  }

  /* Live timer */
  .live-timer {
    font-size: 24px;
  }

  /* Calculator hub grid: single column on mobile */
  .calc-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .calc-card {
    padding: 16px;
    min-height: 44px;
  }
}

/* Footer */
footer {
  text-align: center;
  margin-top: 64px;
  padding: 28px 0 12px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-soft);
  font-size: 13.5px;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
  margin: 0 10px;
  padding: 10px 4px;
  display: inline-block;
  transition: color var(--dur-base) var(--ease-out);
}

footer a:hover {
  color: var(--accent, #2563eb);
  text-decoration: none;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Dark scheme — token overrides.
   Applies in two cases:
   1. System preference dark AND user has NOT overridden to light
   2. User has explicitly chosen dark via <html data-theme="dark">
*/
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --surface-bg-start: #0f1420;
    --surface-bg-end: #0b1018;
    --surface-card: #151b28;
    --surface-muted: #1a2131;
    --border-subtle: #242c3c;
    --border-default: #2d3648;
    --text-strong: #f1f4fa;
    --text-default: #dfe4ee;
    --text-muted: #9aa4b6;
    --text-soft: #6f7a8c;
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px -12px rgba(0, 0, 0, 0.5);
    --shadow-card-hover: 0 2px 4px rgba(0, 0, 0, 0.35), 0 14px 32px -12px rgba(0, 0, 0, 0.6);
    --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  }
}

html[data-theme="dark"] {
  --surface-bg-start: #0f1420;
  --surface-bg-end: #0b1018;
  --surface-card: #151b28;
  --surface-muted: #1a2131;
  --border-subtle: #242c3c;
  --border-default: #2d3648;
  --text-strong: #f1f4fa;
  --text-default: #dfe4ee;
  --text-muted: #9aa4b6;
  --text-soft: #6f7a8c;
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px -12px rgba(0, 0, 0, 0.5);
  --shadow-card-hover: 0 2px 4px rgba(0, 0, 0, 0.35), 0 14px 32px -12px rgba(0, 0, 0, 0.6);
  --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

/* Dark-mode component tweaks (both auto and manual) */
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) body { color: var(--text-default); }
  html:not([data-theme="light"]) .card input[type="date"],
  html:not([data-theme="light"]) .card input[type="text"],
  html:not([data-theme="light"]) .card input[type="number"] {
    background: var(--surface-muted);
    color: var(--text-strong);
    border-color: var(--border-default);
  }
  html:not([data-theme="light"]) .ad-container,
  html:not([data-theme="light"]) .ad-block { background: var(--surface-muted); color: var(--text-soft); }
  html:not([data-theme="light"]) .tools-nav a,
  html:not([data-theme="light"]) .nav-siblings a {
    background: var(--surface-card);
    color: var(--text-muted);
    border-color: var(--border-subtle);
  }
  html:not([data-theme="light"]) .tools-nav a:hover,
  html:not([data-theme="light"]) .nav-siblings a:hover {
    background: var(--surface-muted);
    color: var(--text-strong);
    border-color: var(--border-default);
  }
}

html[data-theme="dark"] .card input[type="date"],
html[data-theme="dark"] .card input[type="text"],
html[data-theme="dark"] .card input[type="number"] {
  background: var(--surface-muted);
  color: var(--text-strong);
  border-color: var(--border-default);
}
html[data-theme="dark"] .ad-container,
html[data-theme="dark"] .ad-block { background: var(--surface-muted); color: var(--text-soft); }
html[data-theme="dark"] .tools-nav a,
html[data-theme="dark"] .nav-siblings a {
  background: var(--surface-card);
  color: var(--text-muted);
  border-color: var(--border-subtle);
}
html[data-theme="dark"] .tools-nav a:hover,
html[data-theme="dark"] .nav-siblings a:hover {
  background: var(--surface-muted);
  color: var(--text-strong);
  border-color: var(--border-default);
}