/* =====================================================================
   Home Project Toolkit — Design System
   ---------------------------------------------------------------------
   Table of contents:
     1. Design tokens (CSS variables)
     2. Reset & base
     3. Typography
     4. Layout: container, sections
     5. Header & navigation
     6. Hero & search
     7. Cards (tool, category, cost)
     8. Calculator card & form
     9. Result box
   10. Content blocks (article body, FAQ)
   11. Breadcrumbs & related tools
   12. Footer
   13. Error / 404 / 500
   14. Utilities & a11y
   15. Responsive breakpoints
   ===================================================================== */

/* 1. Design tokens -------------------------------------------------- */
:root {
  /* Colors — restrained professional palette */
  --color-bg:           #ffffff;
  --color-bg-subtle:    #f7f8fa;
  --color-bg-muted:     #eef0f3;
  --color-border:       #e3e6ea;
  --color-border-strong:#c9ced6;

  --color-text:         #1a1d21;   /* near-black charcoal */
  --color-text-muted:   #565b66;
  --color-text-soft:    #6b7280;

  --color-accent:       #1f6f43;   /* professional green */
  --color-accent-hover: #185433;
  --color-accent-soft:  #e8f3ec;
  --color-accent-border:#b6dcc3;

  --color-success:      #1f7a3a;
  --color-success-soft: #e6f3ea;
  --color-error:        #b91c1c;
  --color-error-soft:   #fdecec;
  --color-warning:      #b45309;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', monospace;

  --fs-h1:    38px;
  --fs-h2:    28px;
  --fs-h3:    22px;
  --fs-body:  16px;
  --fs-small: 14px;
  --fs-xs:    12px;

  --lh-tight: 1.2;
  --lh-snug:  1.35;
  --lh-base:  1.55;
  --lh-relaxed: 1.7;

  /* Spacing scale */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-7:  32px;
  --space-8:  40px;
  --space-9:  56px;
  --space-10: 72px;
  --space-11: 96px;

  /* Radii */
  --radius-sm: 4px;
  --radius:    6px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(16,24,40,0.04), 0 1px 3px rgba(16,24,40,0.05);
  --shadow:    0 2px 6px rgba(16,24,40,0.06), 0 1px 2px rgba(16,24,40,0.04);
  --shadow-md: 0 4px 12px rgba(16,24,40,0.08), 0 2px 4px rgba(16,24,40,0.04);

  /* Layout */
  --container-max:   1200px;
  --container-narrow: 760px;
  --header-height:   64px;

  /* Motion */
  --transition: 150ms ease;
}

/* 2. Reset & base --------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
html, body { height: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-base);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
ul, ol { list-style: none; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* 3. Typography ----------------------------------------------------- */
.h1, h1 { font-size: var(--fs-h1); line-height: var(--lh-tight); font-weight: 700; letter-spacing: -0.02em; }
.h2, h2 { font-size: var(--fs-h2); line-height: var(--lh-snug); font-weight: 700; letter-spacing: -0.01em; }
.h3, h3 { font-size: var(--fs-h3); line-height: var(--lh-snug); font-weight: 600; }
h4, h5, h6 { font-size: var(--fs-body); font-weight: 600; line-height: var(--lh-snug); }
p  { line-height: var(--lh-relaxed); }
strong, b { font-weight: 600; }
small { font-size: var(--fs-small); }

/* 4. Layout: container & sections ----------------------------------- */
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-5); }
.container--narrow { max-width: var(--container-narrow); }
.site-main { flex: 1 0 auto; padding: var(--space-7) 0; }

.section { margin: var(--space-9) 0; }
.section:first-child { margin-top: var(--space-7); }
.section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}
.section__more { font-size: var(--fs-small); font-weight: 500; color: var(--color-accent); }
.section__count { font-size: var(--fs-small); color: var(--color-text-soft); font-weight: 500; }
.empty-state { background: var(--color-bg-subtle); border: 1px dashed var(--color-border-strong); border-radius: var(--radius-md); padding: var(--space-7); text-align: center; color: var(--color-text-muted); }
.section--about { background: var(--color-bg-subtle); padding: var(--space-8) 0; margin: var(--space-10) 0 0; }
.section--about .about-block { max-width: 720px; }
.about-block p + p { margin-top: var(--space-4); }

/* 5. Header & navigation -------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.96);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  height: var(--header-height);
}
.logo { display: inline-flex; align-items: center; gap: var(--space-3); color: var(--color-text); }
.logo:hover { text-decoration: none; }
.logo__mark {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  background: var(--color-accent); color: #fff;
  border-radius: var(--radius);
  flex-shrink: 0;
}
.logo__text { display: flex; flex-direction: column; line-height: 1.1; }
.logo__name { font-weight: 700; font-size: 15px; letter-spacing: -0.01em; }
.logo__sub  { font-size: 11px; color: var(--color-text-soft); font-weight: 500; text-transform: none; }

.nav-desktop { display: none; }
.nav-list { display: flex; align-items: center; gap: var(--space-2); }
.nav-item { position: relative; }
.nav-link {
  display: inline-flex; align-items: center; gap: var(--space-1);
  padding: 8px 12px;
  border-radius: var(--radius);
  color: var(--color-text); font-weight: 500; font-size: var(--fs-small);
}
.nav-link:hover { background: var(--color-bg-subtle); text-decoration: none; }
.nav-link[aria-current="page"] { color: var(--color-accent); }
.nav-caret { color: var(--color-text-soft); transition: transform var(--transition); }
.nav-item.has-dropdown:hover .nav-caret,
.nav-item.has-dropdown:focus-within .nav-caret { transform: rotate(180deg); }
.nav-dropdown {
  position: absolute; top: 100%; left: 0;
  min-width: 220px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-2);
  margin-top: 4px;
  opacity: 0; visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 100;
}
.nav-item.has-dropdown:hover .nav-dropdown,
.nav-item.has-dropdown:focus-within .nav-dropdown {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.nav-dropdown a {
  display: block;
  padding: 8px 10px;
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: var(--fs-small);
}
.nav-dropdown a:hover { background: var(--color-bg-subtle); }

.nav-search {
  position: relative;
  margin-left: auto;
  display: none;
}
.nav-search__icon {
  position: absolute; left: 10px; top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-soft);
  pointer-events: none;
}
.nav-search__input {
  width: 220px;
  height: 36px;
  padding: 0 12px 0 34px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-subtle);
  font-size: var(--fs-small);
  transition: border-color var(--transition), background var(--transition);
}
.nav-search__input:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-bg);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.nav-toggle-btn {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 40px; height: 40px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  margin-left: auto;
}
.nav-toggle-btn__bar {
  display: block;
  width: 18px; height: 2px;
  background: var(--color-text);
  margin: 0 auto;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle-btn[aria-expanded="true"] .nav-toggle-btn__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle-btn[aria-expanded="true"] .nav-toggle-btn__bar:nth-child(2) { opacity: 0; }
.nav-toggle-btn[aria-expanded="true"] .nav-toggle-btn__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.mobile-nav {
  position: fixed;
  top: var(--header-height);
  right: 0; bottom: 0;
  width: min(320px, 80vw);
  background: var(--color-bg);
  border-left: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  transform: translateX(100%);
  transition: transform var(--transition);
  overflow-y: auto;
  z-index: 90;
  visibility: hidden;
}
.mobile-nav.is-open {
  transform: translateX(0);
  visibility: visible;
}
.mobile-nav__inner { padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-4); }
.mobile-nav__search input {
  width: 100%;
  height: 40px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.mobile-nav nav { display: flex; flex-direction: column; gap: var(--space-1); }
.mobile-nav nav a {
  padding: var(--space-3);
  border-radius: var(--radius);
  color: var(--color-text);
  font-weight: 500;
  font-size: var(--fs-body);
}
.mobile-nav nav a:hover { background: var(--color-bg-subtle); text-decoration: none; }
.mobile-nav__sub { padding-left: var(--space-6) !important; font-size: var(--fs-small) !important; color: var(--color-text-muted) !important; }

.mobile-nav-backdrop {
  position: fixed; inset: var(--header-height) 0 0 0;
  background: rgba(16,24,40,0.4);
  z-index: 80;
  opacity: 0; transition: opacity var(--transition);
}
.mobile-nav-backdrop.is-visible { opacity: 1; }
.mobile-nav-backdrop[hidden] { display: none; }

/* 6. Hero & search -------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-11) 0 var(--space-9);
  text-align: center;
}
/* Signature element: a faint blueprint/graph-paper grid, evoking
   "measure twice, cut once" — fades out toward the edges so it reads
   as texture, not noise. */
.hero__grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-accent-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-accent-border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.35;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000 0%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, #000 0%, transparent 75%);
}
/* Corner ruler tick-marks — a second, quieter nod to the same
   measuring motif, anchoring the top-left of the banner. */
.hero__corner-mark {
  position: absolute;
  top: 0; left: 0;
  width: 96px; height: 96px;
  color: var(--color-accent-border);
  z-index: 0;
  pointer-events: none;
}
.hero__inner { position: relative; z-index: 1; }
.hero__eyebrow {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border: 1px solid var(--color-accent-border);
  border-radius: 999px;
  padding: var(--space-2) var(--space-4);
  margin-bottom: var(--space-5);
}
.hero__title { margin-bottom: var(--space-4); }
.hero__title-accent { color: var(--color-accent); }
.hero__lede {
  font-size: 18px;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto var(--space-7);
  line-height: var(--lh-relaxed);
}
.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  margin: 0 auto var(--space-5);
  flex-wrap: wrap;
}
.hero__hint { color: var(--color-text-soft); font-size: var(--fs-small); }
.hero__hint a { color: var(--color-accent); font-weight: 500; }

/* 7. Cards --------------------------------------------------------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--space-3);
}
.tool-grid--cards { grid-template-columns: repeat(2, 1fr); }
.tool-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.tool-card:hover { border-color: var(--color-accent-border); box-shadow: var(--shadow); }
.tool-card__link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  color: var(--color-text);
  height: 100%;
}
.tool-card__link:hover { text-decoration: none; }
.tool-card__icon {
  font-size: 22px;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}
.tool-card__name { font-weight: 600; font-size: var(--fs-body); }
.tool-card__desc {
  font-size: var(--fs-small);
  color: var(--color-text-soft);
  line-height: var(--lh-base);
  flex: 1;
}
.tool-card__arrow {
  align-self: flex-end;
  color: var(--color-accent);
  font-size: var(--fs-small);
  font-weight: 500;
  margin-top: var(--space-2);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}
.category-card {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), background var(--transition);
}
.category-card:hover { border-color: var(--color-accent-border); background: var(--color-accent-soft); }
.category-card a {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-5);
  color: var(--color-text);
  height: 100%;
}
.category-card a:hover { text-decoration: none; }
.category-card__icon { font-size: 24px; color: var(--color-accent); }
.category-card__name { font-weight: 600; font-size: var(--fs-body); }
.category-card__count { font-size: var(--fs-small); color: var(--color-text-soft); }

.cost-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}
.cost-grid--full { grid-template-columns: repeat(2, 1fr); }
.cost-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.cost-card:hover { border-color: var(--color-accent-border); box-shadow: var(--shadow); }
.cost-card a {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  color: var(--color-text);
  height: 100%;
}
.cost-card a:hover { text-decoration: none; }
.cost-card__name { font-weight: 600; }
.cost-card__range { font-size: var(--fs-small); color: var(--color-accent); font-weight: 500; }
.cost-card__desc { font-size: var(--fs-small); color: var(--color-text-soft); }
.cost-card__arrow { align-self: flex-end; color: var(--color-accent); font-size: var(--fs-small); margin-top: var(--space-2); }

/* 8. Calculator card & form --------------------------------------- */
.calculator-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-7);
  box-shadow: var(--shadow-sm);
}
.calculator-form__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4) var(--space-5);
}
.input-group { display: flex; flex-direction: column; gap: var(--space-2); }
.input-label {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-text);
}
.required-mark { color: var(--color-error); margin-left: 2px; }
.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}
.input {
  flex: 1;
  height: 44px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  background: var(--color-bg);
  font-size: var(--fs-body);
  font-variant-numeric: tabular-nums;
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}
.input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}
.input[aria-invalid="true"] {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px var(--color-error-soft);
}
.input-unit {
  position: absolute;
  right: var(--space-4);
  font-size: var(--fs-small);
  color: var(--color-text-soft);
  pointer-events: none;
  font-weight: 500;
}
.input-wrapper:has(.input-padding-right) .input { padding-right: 44px; }
.input-help { font-size: var(--fs-xs); color: var(--color-text-soft); }
.input-error {
  font-size: var(--fs-xs);
  color: var(--color-error);
  font-weight: 500;
}
.input-error[hidden] { display: none; }

.calculator-form__actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
  flex-wrap: wrap;
}

/* 8b. Buttons ----------------------------------------------------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 40px;
  padding: 0 var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: var(--fs-small);
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;
}
.button:hover { text-decoration: none; }
.button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}
.button:active { transform: translateY(1px); }
.button:disabled, .button[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.button-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.button-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.button-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.button-secondary:hover {
  background: var(--color-bg-subtle);
  border-color: var(--color-text-soft);
}

.button-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border-color: transparent;
}
.button-ghost:hover {
  background: var(--color-bg-subtle);
  color: var(--color-text);
}
.button-lg {
  height: 52px;
  padding: 0 var(--space-6);
  font-size: var(--fs-body);
  border-radius: var(--radius-md);
}

/* 9. Result box ---------------------------------------------------- */
.result-box {
  margin-top: var(--space-6);
  padding: var(--space-5) var(--space-6);
  background: var(--color-accent-soft);
  border: 1px solid var(--color-accent-border);
  border-radius: var(--radius-md);
}
.result-box[hidden] { display: none; }
.result-box__heading {
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-3);
}
.result-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-3) var(--space-5); }
.result-list > div { display: contents; }
.result-list dt {
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  font-weight: 500;
}
.result-list dd {
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  line-height: var(--lh-tight);
}
.result-list dd .hint { font-size: var(--fs-small); color: var(--color-text-soft); font-weight: 400; display: block; margin-top: 2px; }
.result-notes { margin-top: var(--space-4); padding-top: var(--space-4); border-top: 1px solid var(--color-accent-border); }
.result-notes li {
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
  padding-left: var(--space-4);
  position: relative;
}
.result-notes li::before { content: "•"; color: var(--color-accent); position: absolute; left: 0; }

/* 10. Content blocks, article body, FAQ --------------------------- */
.content-block { margin: var(--space-7) 0; }
.content-block h2 { margin-bottom: var(--space-3); }
.content-block h3 { margin: var(--space-5) 0 var(--space-2); }
.content-block p { margin-bottom: var(--space-3); line-height: var(--lh-relaxed); }
.content-block ul, .content-block ol { margin: var(--space-3) 0; padding-left: var(--space-5); }
.content-block li { margin-bottom: var(--space-2); line-height: var(--lh-relaxed); }
.content-block--note { background: var(--color-bg-subtle); border-left: 3px solid var(--color-accent); padding: var(--space-4) var(--space-5); border-radius: var(--radius); }
.formula {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4) var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  overflow-x: auto;
  white-space: pre-wrap;
}

.article-body { font-size: var(--fs-body); line-height: var(--lh-relaxed); }
.article-body h2 { margin: var(--space-6) 0 var(--space-3); font-size: var(--fs-h3); font-weight: 700; }
.article-body h3 { margin: var(--space-5) 0 var(--space-2); font-weight: 600; }
.article-body p { margin-bottom: var(--space-3); }
.article-body ul, .article-body ol { margin: var(--space-3) 0; padding-left: var(--space-5); }
.article-body li { margin-bottom: var(--space-2); }
.article-body table { margin: var(--space-4) 0; border: 1px solid var(--color-border); border-radius: var(--radius); overflow: hidden; }
.article-body th, .article-body td { padding: var(--space-3); border-bottom: 1px solid var(--color-border); text-align: left; font-size: var(--fs-small); }
.article-body th { background: var(--color-bg-subtle); font-weight: 600; }
.article-body tr:last-child td { border-bottom: none; }

.faq__list { display: flex; flex-direction: column; gap: var(--space-3); }
.faq__item { background: var(--color-bg-subtle); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--space-4); }
.faq__q { font-weight: 600; margin-bottom: var(--space-2); }
.faq__a { color: var(--color-text-muted); line-height: var(--lh-relaxed); }

/* 11. Breadcrumbs & related tools --------------------------------- */
.breadcrumbs { margin-bottom: var(--space-5); font-size: var(--fs-small); }
.breadcrumbs__list { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }
.breadcrumbs__item { display: inline-flex; align-items: center; }
.breadcrumbs__sep { color: var(--color-text-soft); margin: 0 var(--space-1); }
.breadcrumbs__item a { color: var(--color-text-muted); }
.breadcrumbs__item.is-current span { color: var(--color-text); font-weight: 500; }

.related-tools { margin-top: var(--space-8); padding-top: var(--space-7); border-top: 1px solid var(--color-border); }

/* 12. Footer ------------------------------------------------------ */
.site-footer {
  background: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) 0 0;
  margin-top: var(--space-10);
  flex-shrink: 0;
}
.site-footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-6);
  padding-bottom: var(--space-8);
}
.footer-logo { display: flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-3); color: var(--color-text); }
.footer-logo strong { font-size: var(--fs-body); font-weight: 700; }
.footer-tagline { font-size: var(--fs-small); color: var(--color-text-muted); line-height: var(--lh-relaxed); max-width: 320px; }
.footer-heading { font-size: var(--fs-small); font-weight: 600; margin-bottom: var(--space-3); text-transform: uppercase; letter-spacing: 0.04em; color: var(--color-text-soft); }
.footer-links li { margin-bottom: var(--space-2); }
.footer-links a { color: var(--color-text-muted); font-size: var(--fs-small); }
.footer-links a:hover { color: var(--color-accent); }
.site-footer__bar { border-top: 1px solid var(--color-border); padding: var(--space-4) 0; }
.site-footer__bar-inner {
  display: flex; justify-content: space-between; align-items: center; gap: var(--space-4);
  flex-wrap: wrap;
  font-size: var(--fs-xs); color: var(--color-text-soft);
}

/* 13. Error pages ------------------------------------------------- */
.error-page { padding: var(--space-10) 0; text-align: center; }
.error-page__code { font-size: 84px; font-weight: 700; color: var(--color-accent); line-height: 1; }
.error-page__title { margin-bottom: var(--space-3); }
.error-page__lede { color: var(--color-text-muted); max-width: 540px; margin: 0 auto var(--space-6); }
.error-page .hero-search { max-width: 480px; }
.quick-links { display: flex; justify-content: center; gap: var(--space-3); flex-wrap: wrap; }

/* Search results */
.search-form { display: flex; gap: var(--space-2); margin: var(--space-5) 0; }
.search-form input {
  flex: 1; height: 48px; padding: 0 var(--space-4);
  border: 1px solid var(--color-border-strong); border-radius: var(--radius);
  font-size: var(--fs-body);
}
.search-form input:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px var(--color-accent-soft); }
.search-form button { height: 48px; padding: 0 var(--space-5); }
.search-meta { font-size: var(--fs-small); color: var(--color-text-soft); margin-bottom: var(--space-4); }
.search-results { display: flex; flex-direction: column; gap: var(--space-2); }
.search-result a {
  display: flex; flex-direction: column; gap: var(--space-1);
  padding: var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md);
  color: var(--color-text);
}
.search-result a:hover { border-color: var(--color-accent-border); background: var(--color-bg-subtle); text-decoration: none; }
.search-result__type { font-size: var(--fs-xs); font-weight: 600; color: var(--color-accent); text-transform: uppercase; letter-spacing: 0.05em; }
.search-result__title { font-weight: 600; }
.search-result__snippet { font-size: var(--fs-small); color: var(--color-text-soft); }
.search-empty { color: var(--color-text-muted); padding: var(--space-5) 0; }

/* Article lists */
.article-list { display: flex; flex-direction: column; gap: var(--space-3); }
.article-list__item a {
  display: block;
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: border-color var(--transition), background var(--transition);
}
.article-list__item a:hover { border-color: var(--color-accent-border); background: var(--color-bg-subtle); text-decoration: none; }
.article-list__title { font-size: var(--fs-h3); font-weight: 600; margin-bottom: var(--space-2); }
.article-list__desc { font-size: var(--fs-small); color: var(--color-text-soft); }

/* Cost range card */
.cost-range-card {
  background: var(--color-accent-soft);
  border: 1px solid var(--color-accent-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-7);
  margin-bottom: var(--space-7);
  text-align: center;
}
.cost-range-card__range { font-size: 32px; font-weight: 700; color: var(--color-text); letter-spacing: -0.02em; }
.cost-range-card__unit { font-size: var(--fs-body); font-weight: 500; color: var(--color-text-muted); }
.cost-range-card__updated { font-size: var(--fs-small); color: var(--color-text-soft); margin-top: var(--space-2); }

/* Page header */
.page { padding: 0; }
.page__header { margin-bottom: var(--space-7); padding-bottom: var(--space-5); border-bottom: 1px solid var(--color-border); }
.page__title { margin-bottom: var(--space-3); }
.page__lede { color: var(--color-text-muted); font-size: 18px; max-width: 640px; line-height: var(--lh-relaxed); }

/* Ad slots */
.ad-slot {
  min-height: 90px;
  background: var(--color-bg-subtle);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius);
  margin: var(--space-5) 0;
  display: grid; place-items: center;
  font-size: var(--fs-xs); color: var(--color-text-soft);
}

/* 14. Utilities & a11y -------------------------------------------- */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; top: -100px; left: 0;
  background: var(--color-accent); color: #fff;
  padding: var(--space-3) var(--space-5);
  border-radius: 0 0 var(--radius) 0;
  z-index: 1000;
  font-weight: 500;
}
.skip-link:focus { top: 0; color: #fff; text-decoration: none; }

/* 15. Responsive breakpoints -------------------------------------- */
@media (max-width: 1024px) {
  :root { --fs-h1: 34px; --fs-h2: 26px; }
  .site-footer__inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-desktop { display: none; }
  .nav-search { display: none; }
  .nav-toggle-btn { display: inline-flex; }
  .nav-list { display: none; }

  .tool-grid--cards { grid-template-columns: repeat(2, 1fr); }
  .category-grid    { grid-template-columns: repeat(2, 1fr); }
  .cost-grid        { grid-template-columns: 1fr; }
  .cost-grid--full  { grid-template-columns: 1fr; }

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

  .site-footer__inner { grid-template-columns: 1fr; gap: var(--space-5); }
  .site-footer__bar-inner { flex-direction: column; align-items: flex-start; gap: var(--space-1); }

  .section { margin: var(--space-7) 0; }
}

@media (max-width: 480px) {
  :root {
    --fs-h1: 28px;
    --fs-h2: 24px;
    --fs-h3: 20px;
  }
  .container { padding: 0 var(--space-4); }
  .hero { padding: var(--space-8) 0 var(--space-7); }
  .hero__corner-mark { width: 56px; height: 56px; }
  .hero__eyebrow { font-size: 11px; padding: var(--space-1) var(--space-3); }
  .hero__lede { font-size: 16px; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .button { width: 100%; }
  .hero-search { flex-direction: column; padding: var(--space-3); }
  .hero-search input { padding-left: var(--space-4); }
  .hero-search button { width: 100%; }
  .hero-search__icon { display: none; }
  .hero-search input { padding-left: var(--space-4); }

  .calculator-card { padding: var(--space-4); }
  .calculator-form__actions { flex-direction: column; }
  .calculator-form__actions .button { width: 100%; }

  .tool-grid--cards { grid-template-columns: 1fr; }
  .category-grid    { grid-template-columns: 1fr; }

  .cost-range-card { padding: var(--space-5); }
  .cost-range-card__range { font-size: 26px; }
}

@media (min-width: 769px) {
  .nav-desktop { display: block; }
  .nav-search  { display: block; }
  .nav-toggle-btn { display: none; }
  .mobile-nav { display: none; }
  .mobile-nav-backdrop { display: none; }
}

@media (min-width: 1024px) {
  .tool-grid--cards { grid-template-columns: repeat(4, 1fr); }
  .category-grid    { grid-template-columns: repeat(4, 1fr); }
  .cost-grid--full  { grid-template-columns: repeat(3, 1fr); }
}

@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;
  }
}