/* ============================================================
   SuperCalc — Design System
   ============================================================ */

/* --- Custom Properties --- */
:root {
  --clr-primary:        #2563EB;
  --clr-primary-dark:   #1D4ED8;
  --clr-primary-light:  #DBEAFE;
  --clr-success:        #059669;
  --clr-success-light:  #D1FAE5;
  --clr-warning:        #D97706;
  --clr-warning-light:  #FEF3C7;
  --clr-danger:         #DC2626;

  --clr-bg:             #F8FAFC;
  --clr-surface:        #FFFFFF;
  --clr-surface-2:      #F1F5F9;
  --clr-border:         #E2E8F0;
  --clr-border-focus:   #93C5FD;
  --clr-text:           #1E293B;
  --clr-text-muted:     #64748B;
  --clr-text-subtle:    #94A3B8;

  --sp-1: 4px;  --sp-2: 8px;   --sp-3: 12px;  --sp-4: 16px;
  --sp-5: 20px; --sp-6: 24px;  --sp-8: 32px;  --sp-10: 40px;
  --sp-12: 48px; --sp-16: 64px;

  --r-sm:   6px;
  --r-md:   10px;
  --r-lg:   16px;
  --r-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.05), 0 10px 15px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);

  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;

  --container-sm:  640px;
  --container-md:  768px;
  --container-lg:  1024px;
  --container-xl:  1200px;

  --transition: 150ms ease;
}

/* Dark mode overrides */
[data-theme="dark"] {
  --clr-bg:            #0F172A;
  --clr-surface:       #1E293B;
  --clr-surface-2:     #0F172A;
  --clr-border:        #334155;
  --clr-border-focus:  #3B82F6;
  --clr-text:          #F1F5F9;
  --clr-text-muted:    #94A3B8;
  --clr-text-subtle:   #64748B;
  --clr-primary-light: #1E3A5F;
  --clr-success-light: #064E3B;
  --clr-warning-light: #451A03;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.5);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background var(--transition), color var(--transition);
}
img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; }
a { color: var(--clr-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; }

/* --- Typography --- */
h1 { font-size: clamp(1.5rem, 4vw, 2.25rem); font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.125rem, 3vw, 1.5rem); font-weight: 600; line-height: 1.3; }
h3 { font-size: 1.0625rem; font-weight: 600; line-height: 1.4; }
p { color: var(--clr-text-muted); }

/* --- Layout --- */
.container     { width: 100%; max-width: var(--container-lg); margin-inline: auto; padding-inline: var(--sp-4); }
.container--sm { max-width: var(--container-sm); }
.container--xl { max-width: var(--container-xl); }
main { flex: 1; }

/* --- Header --- */
.site-header {
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background var(--transition), border-color var(--transition);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: var(--sp-4);
}
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--clr-text);
  text-decoration: none;
  flex-shrink: 0;
}
.site-logo:hover { text-decoration: none; }
.site-logo__icon {
  width: 32px;
  height: 32px;
  background: var(--clr-primary);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: white;
  flex-shrink: 0;
}
.site-logo__text em { color: var(--clr-primary); font-style: normal; }

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

/* --- Theme Toggle --- */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--r-full);
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  color: var(--clr-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--transition);
  flex-shrink: 0;
  line-height: 1;
}
.theme-toggle:hover { background: var(--clr-surface-2); color: var(--clr-text); }

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 0.8125rem;
  color: var(--clr-text-muted);
  padding-block: var(--sp-3);
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--clr-text-muted); }
.breadcrumb a:hover { color: var(--clr-primary); }
.breadcrumb__sep { color: var(--clr-text-subtle); }

/* --- Ad Slots --- */
.ad-slot {
  background: var(--clr-surface-2);
  border: 1px dashed var(--clr-border);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-text-subtle);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  overflow: hidden;
  transition: background var(--transition);
}
.ad-slot--leaderboard { width: 100%; min-height: 90px; margin-block: var(--sp-4); }
.ad-slot--rectangle   { min-height: 250px; max-width: 336px; margin-inline: auto; margin-block: var(--sp-8); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0.625rem var(--sp-5);
  border-radius: var(--r-md);
  font-weight: 500;
  font-size: 0.9375rem;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all var(--transition);
  line-height: 1;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn--primary  { background: var(--clr-primary); color: white; border-color: var(--clr-primary); }
.btn--primary:hover { background: var(--clr-primary-dark); border-color: var(--clr-primary-dark); }
.btn--secondary { background: var(--clr-surface); color: var(--clr-text); border-color: var(--clr-border); }
.btn--secondary:hover { background: var(--clr-surface-2); }
.btn--ghost { background: transparent; color: var(--clr-text-muted); border-color: transparent; }
.btn--ghost:hover { background: var(--clr-surface-2); color: var(--clr-text); }
.btn--danger { background: transparent; color: var(--clr-danger); border-color: transparent; padding-inline: var(--sp-2); }
.btn--danger:hover { background: #FEF2F2; }
[data-theme="dark"] .btn--danger:hover { background: #450a0a; }
.btn--sm  { padding: var(--sp-1) var(--sp-3); font-size: 0.8125rem; border-radius: var(--r-sm); }
.btn--lg  { padding: 0.875rem var(--sp-8); font-size: 1rem; }
.btn--full { width: 100%; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

/* --- Form Controls --- */
.form-group  { display: flex; flex-direction: column; gap: var(--sp-1); }
.form-label  {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.form-input,
.form-select {
  width: 100%;
  padding: 0.625rem var(--sp-3);
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--r-md);
  color: var(--clr-text);
  font-size: 1rem;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  appearance: none;
  -webkit-appearance: none;
}
.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.form-input::placeholder { color: var(--clr-text-subtle); }
.form-input--prefix { padding-left: 1.75rem; }

.input-wrapper  { position: relative; }
.input-prefix   {
  position: absolute;
  left: var(--sp-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--clr-text-muted);
  pointer-events: none;
  font-size: 0.9375rem;
  line-height: 1;
}
.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2364748B' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 2.25rem;
  cursor: pointer;
}
[data-theme="dark"] .form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2394A3B8' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

/* --- Calculator Page --- */
.calc-page { padding-block: var(--sp-8); }
.calc-page__header { margin-bottom: var(--sp-6); }
.calc-page__description {
  font-size: 1rem;
  color: var(--clr-text-muted);
  margin-top: var(--sp-2);
  max-width: 60ch;
  line-height: 1.65;
}

.calc-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), border-color var(--transition);
}

/* --- Item Rows (unit price) --- */
.item-list { display: flex; flex-direction: column; gap: var(--sp-3); }

.item-row {
  padding: var(--sp-4);
  background: var(--clr-surface-2);
  border-radius: var(--r-md);
  border: 2px solid var(--clr-border);
  transition: border-color var(--transition), background var(--transition);
}
.item-row--best {
  border-color: var(--clr-success);
  background: var(--clr-success-light);
}
.item-row__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-3);
}
.item-num {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--clr-text-muted);
}
.item-row--best .item-num { color: var(--clr-success); }

.item-row__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-3);
  align-items: end;
}
.item-field--name,
.item-field--price { grid-column: 1 / -1; }

/* --- Results --- */
.results-section { margin-top: var(--sp-6); }
.results-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--clr-text-muted);
  margin-bottom: var(--sp-3);
}
.result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-4);
  border-radius: var(--r-md);
  border: 2px solid var(--clr-border);
  background: var(--clr-surface);
  gap: var(--sp-4);
  flex-wrap: wrap;
  transition: all var(--transition);
}
.result-item + .result-item { margin-top: var(--sp-2); }
.result-item--best {
  border-color: var(--clr-success);
  background: var(--clr-success-light);
}
.result-item__info { flex: 1; min-width: 0; }
.result-item__name {
  font-weight: 600;
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
}
.result-item__sub  { font-size: 0.8125rem; color: var(--clr-text-muted); margin-top: 2px; }
.result-item__meta { text-align: right; flex-shrink: 0; }
.result-item__price {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--clr-text);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}
.result-item--best .result-item__price { color: var(--clr-success); }
.result-item__price-unit { font-size: 0.625em; font-weight: 500; color: var(--clr-text-muted); }
.result-item--best .result-item__price-unit { color: var(--clr-success); opacity: 0.8; }
.result-item__price2 { font-size: 0.8125rem; color: var(--clr-text-muted); margin-top: 2px; }

.best-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  background: var(--clr-success);
  color: white;
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--r-full);
  white-space: nowrap;
  vertical-align: middle;
}
.savings-text { color: var(--clr-danger); }

/* --- Calc Actions Row --- */
.calc-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-top: var(--sp-4);
}

/* --- Alert --- */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-md);
  font-size: 0.875rem;
  line-height: 1.55;
  margin-top: var(--sp-4);
}
.alert--warning { background: var(--clr-warning-light); color: var(--clr-warning); border: 1px solid rgba(217,119,6,0.25); }
.alert--info    { background: var(--clr-primary-light); color: var(--clr-primary); border: 1px solid rgba(37,99,235,0.2); }

/* --- Home: Hero --- */
.hero {
  background: linear-gradient(135deg, #1E40AF 0%, #2563EB 60%, #0EA5E9 100%);
  color: white;
  padding-block: var(--sp-12) var(--sp-10);
  text-align: center;
}
.hero__title { color: white; margin-bottom: var(--sp-3); }
.hero__subtitle {
  font-size: 1.0625rem;
  color: rgba(255,255,255,0.88);
  max-width: 48ch;
  margin-inline: auto;
  margin-bottom: var(--sp-6);
}
.hero__search-wrap {
  max-width: 420px;
  margin-inline: auto;
  position: relative;
}
.hero__search-icon {
  position: absolute;
  left: var(--sp-3);
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  pointer-events: none;
}
.hero__search {
  width: 100%;
  padding: 0.75rem var(--sp-4) 0.75rem 2.5rem;
  border-radius: var(--r-full);
  border: 2px solid rgba(255,255,255,0.35);
  background: rgba(255,255,255,0.18);
  color: white;
  font-size: 1rem;
  backdrop-filter: blur(4px);
  transition: all var(--transition);
  appearance: none;
}
.hero__search::placeholder { color: rgba(255,255,255,0.65); }
.hero__search:focus {
  outline: none;
  border-color: white;
  background: rgba(255,255,255,0.28);
  box-shadow: 0 0 0 3px rgba(255,255,255,0.2);
}
.hero__stats {
  display: flex;
  justify-content: center;
  gap: var(--sp-8);
  margin-top: var(--sp-8);
  flex-wrap: wrap;
}
.hero__stat { text-align: center; }
.hero__stat-num { font-size: 1.5rem; font-weight: 700; color: white; line-height: 1; }
.hero__stat-label { font-size: 0.8125rem; color: rgba(255,255,255,0.75); margin-top: 2px; }

/* --- Home: Category Sections --- */
.home-content { padding-block: var(--sp-10); }
.category-section { margin-bottom: var(--sp-10); }
.category-header {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
  padding-bottom: var(--sp-3);
  border-bottom: 2px solid var(--clr-border);
}
.category-icon { font-size: 1.25rem; line-height: 1; }
.category-title {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--clr-text-muted);
}

/* --- Home: Calculator Cards Grid --- */
.calc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: var(--sp-3); }
@media (max-width: 360px) { .calc-grid { grid-template-columns: 1fr; } }

.calc-grid-card {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-4);
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--r-lg);
  text-decoration: none;
  color: var(--clr-text);
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
.calc-grid-card:hover {
  border-color: var(--clr-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  text-decoration: none;
}
.calc-grid-card--soon {
  opacity: 0.55;
  pointer-events: none;
  cursor: default;
}
.calc-grid-card__icon {
  width: 40px;
  height: 40px;
  background: var(--clr-primary-light);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
  transition: background var(--transition);
}
.calc-grid-card:hover .calc-grid-card__icon { background: var(--clr-primary); }
.calc-grid-card__body { flex: 1; min-width: 0; }
.calc-grid-card__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--clr-text);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
  line-height: 1.3;
}
.calc-grid-card__desc { font-size: 0.8125rem; color: var(--clr-text-muted); margin-top: 3px; line-height: 1.4; }

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 7px;
  border-radius: var(--r-full);
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  vertical-align: middle;
}
.badge--live { background: var(--clr-success-light); color: var(--clr-success); }
.badge--soon { background: var(--clr-surface-2); color: var(--clr-text-subtle); border: 1px solid var(--clr-border); }

/* --- FAQ --- */
.faq-section { margin-top: var(--sp-10); }
.faq-section__title { margin-bottom: var(--sp-5); }
.faq-item { border-bottom: 1px solid var(--clr-border); }
.faq-item:first-of-type { border-top: 1px solid var(--clr-border); }
.faq-question {
  width: 100%;
  text-align: left;
  padding: var(--sp-4) 0;
  background: none;
  border: none;
  color: var(--clr-text);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  transition: color var(--transition);
}
.faq-question:hover { color: var(--clr-primary); }
.faq-chevron { font-size: 0.875rem; transition: transform var(--transition); color: var(--clr-text-muted); flex-shrink: 0; }
.faq-item.open .faq-chevron { transform: rotate(180deg); }
.faq-answer {
  display: none;
  padding-bottom: var(--sp-4);
  color: var(--clr-text-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
}
.faq-item.open .faq-answer { display: block; }

/* --- Related Calculators --- */
.related-section { margin-top: var(--sp-10); }
.related-section h2 { margin-bottom: var(--sp-4); }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: var(--sp-3); }
.related-card {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--r-md);
  text-decoration: none;
  color: var(--clr-text);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition);
}
.related-card:hover {
  border-color: var(--clr-primary);
  color: var(--clr-primary);
  background: var(--clr-primary-light);
  text-decoration: none;
}

/* --- Footer --- */
.site-footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding-block: var(--sp-8);
  margin-top: auto;
  transition: background var(--transition);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-4);
}
.footer-links { display: flex; gap: var(--sp-5); flex-wrap: wrap; }
.footer-links a { font-size: 0.875rem; color: var(--clr-text-muted); }
.footer-links a:hover { color: var(--clr-primary); text-decoration: none; }
.footer-copy { font-size: 0.875rem; color: var(--clr-text-muted); }

/* --- Utilities --- */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.hidden   { display: none !important; }
.mt-4     { margin-top: var(--sp-4); }
.mt-6     { margin-top: var(--sp-6); }

/* --- Responsive --- */
@media (max-width: 600px) {
  .calc-card { padding: var(--sp-4); }
  .hero { padding-block: var(--sp-8) var(--sp-8); }
  .hero__stats { gap: var(--sp-6); }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

/* --- Tip Presets --- */
.tip-presets { display: flex; flex-wrap: wrap; gap: var(--sp-2); }
.tip-btn {
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-full);
  border: 1.5px solid var(--clr-border);
  background: var(--clr-surface);
  color: var(--clr-text);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
  line-height: 1;
}
.tip-btn:hover { border-color: var(--clr-primary); color: var(--clr-primary); }
.tip-btn.active { background: var(--clr-primary); border-color: var(--clr-primary); color: white; }

/* --- Stepper (+/- counter) --- */
.stepper { display: inline-flex; align-items: center; border: 1.5px solid var(--clr-border); border-radius: var(--r-md); overflow: hidden; }
.stepper__btn {
  width: 44px; height: 44px; border: none;
  background: var(--clr-surface-2); color: var(--clr-text);
  font-size: 1.375rem; line-height: 1; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition);
  -webkit-tap-highlight-color: transparent; flex-shrink: 0;
}
.stepper__btn:hover:not(:disabled) { background: var(--clr-border); }
.stepper__btn:disabled { opacity: 0.35; cursor: default; }
.stepper__val { min-width: 56px; text-align: center; font-size: 1.125rem; font-weight: 700; color: var(--clr-text); padding-inline: var(--sp-2); font-variant-numeric: tabular-nums; }

/* --- Result Rows (tip calculator) --- */
.result-rows { display: flex; flex-direction: column; }
.result-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--sp-3) 0; border-bottom: 1px solid var(--clr-border); gap: var(--sp-4);
}
.result-row:first-child { border-top: 1px solid var(--clr-border); }
.result-row__label { font-size: 0.9375rem; color: var(--clr-text-muted); }
.result-row__value { font-size: 1.125rem; font-weight: 700; color: var(--clr-text); font-variant-numeric: tabular-nums; }
.result-row--total .result-row__label { font-weight: 600; color: var(--clr-text); }
.result-row--total .result-row__value { font-size: 1.5rem; color: var(--clr-primary); }
.result-section-label {
  font-size: 0.6875rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--clr-text-muted); margin-top: var(--sp-5); margin-bottom: var(--sp-2);
  padding-bottom: var(--sp-2); border-bottom: 2px solid var(--clr-border);
}

/* --- Mode Tabs (percentage calculator) --- */
.mode-tabs {
  display: flex; background: var(--clr-surface-2); border: 1px solid var(--clr-border);
  border-radius: var(--r-md); padding: 3px; gap: 3px; margin-bottom: var(--sp-5);
}
.mode-tab {
  flex: 1; padding: var(--sp-2) var(--sp-2); border: none;
  border-radius: calc(var(--r-md) - 2px);
  background: transparent; color: var(--clr-text-muted);
  font-size: 0.8125rem; font-weight: 500; cursor: pointer;
  transition: all var(--transition); line-height: 1.3; text-align: center;
  -webkit-tap-highlight-color: transparent;
}
.mode-tab.active { background: var(--clr-surface); color: var(--clr-text); box-shadow: var(--shadow-sm); font-weight: 600; }
.mode-tab:hover:not(.active) { color: var(--clr-text); }

/* --- Big Result (percentage calculator) --- */
.big-result {
  margin-top: var(--sp-6); padding: var(--sp-5);
  background: var(--clr-primary-light); border: 2px solid var(--clr-primary);
  border-radius: var(--r-lg); text-align: center; transition: all var(--transition);
}
.big-result--success { background: var(--clr-success-light); border-color: var(--clr-success); }
.big-result--danger  { background: #FEF2F2; border-color: var(--clr-danger); }
[data-theme="dark"] .big-result--danger { background: #450a0a; }
.big-result__label { font-size: 0.875rem; color: var(--clr-text-muted); margin-bottom: var(--sp-2); }
.big-result__value { font-size: clamp(2rem, 8vw, 3rem); font-weight: 800; color: var(--clr-primary); line-height: 1; font-variant-numeric: tabular-nums; }
.big-result--success .big-result__value { color: var(--clr-success); }
.big-result--danger  .big-result__value { color: var(--clr-danger); }
.big-result__sub { font-size: 0.875rem; color: var(--clr-text-muted); margin-top: var(--sp-2); line-height: 1.5; }

/* --- Input suffix --- */
.input-suffix {
  position: absolute; right: var(--sp-3); top: 50%; transform: translateY(-50%);
  color: var(--clr-text-muted); pointer-events: none; font-size: 0.9375rem; line-height: 1;
}
.form-input--suffix { padding-right: 2.25rem; }

/* --- Percentage field pairs --- */
.pct-fields { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-4); }
@media (max-width: 400px) { .pct-fields { grid-template-columns: 1fr; } }

/* --- Settings Panel --- */
.settings-wrap { position: relative; }

.settings-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--r-full);
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  color: var(--clr-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  line-height: 1;
  transition: all var(--transition);
  flex-shrink: 0;
}
.settings-btn:hover,
.settings-btn[aria-expanded="true"] {
  background: var(--clr-surface-2);
  color: var(--clr-text);
  border-color: var(--clr-primary);
}

.settings-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--sp-4);
  min-width: 272px;
  z-index: 200;
  animation: panelIn 150ms ease;
  transition: background var(--transition), border-color var(--transition);
}
@keyframes panelIn {
  from { opacity: 0; transform: translateY(-6px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0)    scale(1);    }
}
.settings-panel.hidden { display: none; }

.settings-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-4);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--clr-border);
}
.settings-panel__title { font-size: 0.875rem; font-weight: 700; color: var(--clr-text); }
.settings-panel__close {
  width: 24px;
  height: 24px;
  border-radius: var(--r-full);
  border: none;
  background: var(--clr-surface-2);
  color: var(--clr-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  line-height: 1;
  transition: all var(--transition);
}
.settings-panel__close:hover { background: var(--clr-border); color: var(--clr-text); }

.settings-section { margin-bottom: var(--sp-4); }
.settings-section:last-child { margin-bottom: 0; }
.settings-label {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: var(--sp-2);
}
.settings-hint {
  font-size: 0.75rem;
  color: var(--clr-text-subtle);
  margin-top: var(--sp-1);
  line-height: 1.4;
}

/* Measurement toggle — pill switcher */
.measure-toggle {
  display: flex;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-md);
  padding: 3px;
  gap: 3px;
}
.measure-btn {
  flex: 1;
  padding: var(--sp-2) var(--sp-3);
  border: none;
  border-radius: calc(var(--r-md) - 2px);
  background: transparent;
  color: var(--clr-text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  line-height: 1;
}
.measure-btn.active {
  background: var(--clr-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}
.measure-btn:hover:not(.active) { color: var(--clr-text); background: var(--clr-border); }

/* --- Share Bar --- */
.share-bar {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  flex-wrap: wrap;
  padding: var(--sp-4) var(--sp-5);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-lg);
  margin-block: var(--sp-6);
  transition: background var(--transition), border-color var(--transition);
}
.share-bar__label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--clr-text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}
.share-bar__btns { display: flex; flex-wrap: wrap; gap: var(--sp-2); }

.share-btn {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 6px var(--sp-3);
  border-radius: var(--r-full);
  border: 1.5px solid var(--clr-border);
  background: var(--clr-surface);
  color: var(--clr-text-muted);
  font-size: 0.8125rem; font-weight: 500;
  cursor: pointer; text-decoration: none;
  transition: all var(--transition);
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
  line-height: 1;
}
.share-btn:hover { text-decoration: none; }

.share-btn--x:hover        { border-color: #000;     color: #000;     background: #f0f0f0; }
.share-btn--facebook:hover { border-color: #1877f2;  color: #1877f2;  background: #e7f3ff; }
.share-btn--whatsapp:hover { border-color: #25d366;  color: #1a7a44;  background: #e8fef0; }
.share-btn--reddit:hover   { border-color: #ff4500;  color: #cc3700;  background: #fff3f0; }
.share-btn--linkedin:hover { border-color: #0a66c2;  color: #0a66c2;  background: #e8f3fb; }
.share-btn--copy:hover     { border-color: var(--clr-primary); color: var(--clr-primary); }
.share-btn--copy.copied    { border-color: var(--clr-success); color: var(--clr-success); background: var(--clr-success-light); }

[data-theme="dark"] .share-btn--x:hover        { background: rgba(255,255,255,0.08); border-color: #888; color: #eee; }
[data-theme="dark"] .share-btn--facebook:hover { background: rgba(24,119,242,0.15); }
[data-theme="dark"] .share-btn--whatsapp:hover { background: rgba(37,211,102,0.15); color: #25d366; }
[data-theme="dark"] .share-btn--reddit:hover   { background: rgba(255,69,0,0.15);   color: #ff6a33; }
[data-theme="dark"] .share-btn--linkedin:hover { background: rgba(10,102,194,0.15); }

/* --- Savings Callout (discount calculator) --- */
.savings-callout {
  margin-top: var(--sp-3);
  padding: var(--sp-2) var(--sp-4);
  background: var(--clr-success-light);
  border: 1px solid rgba(5, 150, 105, 0.2);
  border-radius: var(--r-md);
  color: var(--clr-success);
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
}

/* --- Favourites --- */
.calc-grid-card { position: relative; }
.fav-btn {
  position: absolute;
  top: var(--sp-2); right: var(--sp-2);
  width: 28px; height: 28px;
  border: none; background: transparent;
  color: var(--clr-text-subtle); font-size: 1rem; line-height: 1;
  cursor: pointer; border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  transition: color var(--transition), background var(--transition);
  -webkit-tap-highlight-color: transparent;
  pointer-events: auto; z-index: 1;
}
.fav-btn:hover { color: var(--clr-warning); background: var(--clr-warning-light); }
.fav-btn--active { color: var(--clr-warning) !important; }

.calc-fav-btn {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: 5px var(--sp-3);
  border: 1.5px solid var(--clr-border); border-radius: var(--r-full);
  background: transparent; color: var(--clr-text-muted);
  font-size: 0.8125rem; font-weight: 500; cursor: pointer;
  transition: all var(--transition); margin-top: var(--sp-3);
  -webkit-tap-highlight-color: transparent;
}
.calc-fav-btn:hover,
.calc-fav-btn--active {
  border-color: var(--clr-warning); color: var(--clr-warning);
  background: var(--clr-warning-light);
}
[data-theme="dark"] .calc-fav-btn--active,
[data-theme="dark"] .calc-fav-btn:hover {
  background: var(--clr-warning-light);
}

.fav-section { margin-bottom: var(--sp-10); }

/* --- Cookie Consent Banner --- */
.cookie-banner {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 999;
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  box-shadow: 0 -4px 20px rgba(0,0,0,0.10);
  padding: var(--sp-4) var(--sp-6);
  transform: translateY(100%);
  transition: transform 300ms ease;
}
.cookie-banner--visible { transform: translateY(0); }

.cookie-banner__inner {
  max-width: var(--container-xl);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  flex-wrap: wrap;
}
.cookie-banner__text {
  flex: 1;
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  line-height: 1.6;
  margin: 0;
  min-width: 220px;
}
.cookie-banner__link { color: var(--clr-primary); }
.cookie-banner__link:hover { text-decoration: underline; }

.cookie-banner__actions {
  display: flex;
  gap: var(--sp-3);
  flex-shrink: 0;
}
.cookie-banner__btn {
  padding: var(--sp-2) var(--sp-5);
  border-radius: var(--r-md);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid;
  transition: all var(--transition);
  white-space: nowrap;
  line-height: 1.4;
}
.cookie-banner__btn--accept {
  background: var(--clr-primary);
  border-color: var(--clr-primary);
  color: #fff;
}
.cookie-banner__btn--accept:hover {
  background: var(--clr-primary-dark);
  border-color: var(--clr-primary-dark);
}
.cookie-banner__btn--decline {
  background: transparent;
  border-color: var(--clr-border);
  color: var(--clr-text-muted);
}
.cookie-banner__btn--decline:hover {
  border-color: var(--clr-text-muted);
  color: var(--clr-text);
}
[data-theme="dark"] .cookie-banner { box-shadow: 0 -4px 20px rgba(0,0,0,0.4); }

@media (max-width: 560px) {
  .cookie-banner { padding: var(--sp-4); }
  .cookie-banner__inner { gap: var(--sp-3); }
  .cookie-banner__actions { width: 100%; justify-content: flex-end; }
}

/* --- FAQ Heading Wrapper (SEO: questions as H3 headings) --- */
.faq-question-heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
}

/* --- How To Use Section --- */
.how-to-section {
  margin: var(--sp-8) 0;
  padding: var(--sp-6) var(--sp-8);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-lg);
}
.how-to-section__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: var(--sp-5);
}
.how-to-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  margin: 0;
  padding: 0;
}
.how-to-step {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-4);
}
.how-to-step__num {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  background: var(--clr-primary);
  color: #fff;
  border-radius: var(--r-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 700;
  margin-top: 1px;
}
.how-to-step__text {
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
  line-height: 1.65;
  padding-top: 4px;
}
.how-to-step__text strong { color: var(--clr-text); }
@media (max-width: 600px) {
  .how-to-section { padding: var(--sp-5) var(--sp-4); }
}

/* --- Print --- */
@media print {
  .ad-slot, .site-header, .site-footer, .theme-toggle, .related-section { display: none; }
  body { background: white; color: black; }
}