/* ============================================
   DESIGN SYSTEM — Home Improvement Cost Calculators
   ============================================ */

/* ---------- CSS Reset ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ---------- Design Tokens ---------- */
:root {
  /* Colors — Clean Warm Stone & Forest Green Trustworthy Theme (Light Mode) */
  --color-bg-primary: #FAFAF9; /* Warm stone white background */
  --color-bg-secondary: #F5F5F4; /* Soft warm stone secondary */
  --color-bg-card: #FFFFFF; /* Pure white card background */
  --color-bg-input: #FFFFFF; /* White inputs */
  --color-bg-hover: #F5F5F4;

  --color-text-primary: #1C1917; /* Dark stone (soft dark gray) */
  --color-text-secondary: #44403C; /* Medium warm gray */
  --color-text-muted: #78716C; /* Muted stone gray */
  --color-text-inverse: #FFFFFF; /* White text for green buttons */

  --color-accent: #16A34A; /* Approachable and trustworthy green */
  --color-accent-hover: #15803D; /* Darker green hover state */
  --color-accent-glow: rgba(22, 163, 74, 0.15);
  --color-accent-subtle: rgba(22, 163, 74, 0.06);

  --color-warning: #D97706; /* Warm amber */
  --color-error: #EF4444; /* Crimson red */
  --color-success: #16A34A; /* Green success */
  --color-info: #2563EB; /* Trustworthy blue */

  --color-border: #E7E5E4; /* Very light stone border */
  --color-border-hover: #D6D3D1; /* Medium light stone border */
  --color-border-accent: rgba(22, 163, 74, 0.25);

  --color-nav-bg: rgba(255, 255, 255, 0.90);
  --color-track-bg: #E7E5E4;
  --color-result-bg: #F0FDF4;
  --color-result-border: rgba(22, 163, 74, 0.15);

  /* Gradients */
  --gradient-card: linear-gradient(180deg, #FFFFFF 0%, #FFFFFF 100%);
  --gradient-accent: linear-gradient(135deg, #16A34A 0%, #15803D 100%);
  --gradient-hero: linear-gradient(180deg, #F5F5F4 0%, #FAFAF9 100%);
  --gradient-glow: radial-gradient(ellipse at 50% 0%, rgba(22, 163, 74, 0.08) 0%, transparent 60%);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  --leading-tight: 1.2;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-glow: 0 4px 12px rgba(22, 163, 74, 0.08);
  --shadow-glow-strong: 0 6px 18px rgba(22, 163, 74, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-spring: 300ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --nav-height: 64px;
}

[data-theme="dark"] {
  /* Colors — Deep Slate & Emerald Teal Theme (Dark Mode) */
  --color-bg-primary: #0F172A;
  --color-bg-secondary: #1E293B;
  --color-bg-card: #1E293B;
  --color-bg-input: #0F172A;
  --color-bg-hover: #1E293B;

  --color-text-primary: #F8FAFC;
  --color-text-secondary: #CBD5E1;
  --color-text-muted: #64748B;
  --color-text-inverse: #0F172A;

  --color-accent: #10B981; /* Brighter green for dark mode contrast */
  --color-accent-hover: #059669;
  --color-accent-glow: rgba(16, 185, 129, 0.15);
  --color-accent-subtle: rgba(16, 185, 129, 0.06);

  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-success: #10B981;
  --color-info: #3B82F6;

  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.15);
  --color-border-accent: rgba(16, 185, 129, 0.25);

  --color-nav-bg: rgba(15, 23, 42, 0.90);
  --color-track-bg: #334155;
  --color-result-bg: rgba(16, 185, 129, 0.08);
  --color-result-border: rgba(16, 185, 129, 0.25);

  /* Gradients */
  --gradient-card: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
  --gradient-accent: linear-gradient(135deg, #10B981 0%, #059669 100%);
  --gradient-hero: linear-gradient(180deg, #0F172A 0%, #1E293B 50%, #0F172A 100%);
  --gradient-glow: radial-gradient(ellipse at 50% 0%, rgba(16, 185, 129, 0.12) 0%, transparent 60%);

  /* Shadows */
  --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 8px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 24px rgba(16, 185, 129, 0.18);
  --shadow-glow-strong: 0 0 48px rgba(16, 185, 129, 0.3);
}

/* ---------- Base Styles ---------- */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: var(--leading-normal);
  min-height: 100vh;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
}

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

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p {
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-text-muted); }
.text-mono { font-family: var(--font-mono); }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding: var(--space-16) 0;
}

.section--lg {
  padding: var(--space-24) 0;
}

/* ---------- Navigation ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--color-nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.nav__logo {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav__logo-icon {
  width: 28px;
  height: 28px;
  background: var(--gradient-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav__link {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  transition: color var(--transition-fast);
  position: relative;
  padding: var(--space-1) 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-base);
}

.nav__link:hover::after,
.nav__link--active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-accent);
}

.nav__hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: var(--text-xl);
  cursor: pointer;
  padding: var(--space-2);
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  transition: background var(--transition-fast), color var(--transition-fast);
  margin-left: auto;
  margin-right: var(--space-2);
}

.theme-toggle:hover {
  background: var(--color-bg-secondary);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* ---------- Cards ---------- */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card--accent {
  border-color: var(--color-border-accent);
  background: var(--gradient-card);
  box-shadow: var(--shadow-glow);
}

.card--flat {
  background: var(--color-bg-secondary);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  line-height: 1;
}

.btn--primary {
  background: var(--gradient-accent);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-glow);
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow-strong);
}

.btn--secondary {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-border-accent);
}

.btn--secondary:hover {
  background: var(--color-accent-subtle);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  border-radius: var(--radius-md);
}

.btn--full {
  width: 100%;
}

/* ---------- Form Controls ---------- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  transition: all var(--transition-fast);
  appearance: none;
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23a0a0b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  padding-right: var(--space-10);
}

/* Range Slider */
.form-range {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--color-track-bg); /* Themed track bg */
  border-radius: var(--radius-full);
  outline: none;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  background: var(--gradient-accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  transition: transform var(--transition-fast);
}

.form-range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.form-range::-moz-range-thumb {
  width: 22px;
  height: 22px;
  background: var(--gradient-accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-glow);
}

.range-display {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-1);
}

.range-value {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--color-accent);
  font-family: var(--font-mono);
}

/* ---------- Result Display ---------- */
.result-card {
  background: var(--color-result-bg);
  border: 1px solid var(--color-result-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.result-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
}

.result-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.result-amount {
  font-size: var(--text-5xl);
  font-weight: var(--weight-bold);
  color: var(--color-accent);
  font-family: var(--font-mono);
  line-height: 1;
}

.result-range {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.result-range__item {
  text-align: center;
}

.result-range__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-range__value {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  font-family: var(--font-mono);
  margin-top: var(--space-1);
}

.result-range__value--low {
  color: var(--color-success);
}

.result-range__value--mid {
  color: var(--color-accent);
}

.result-range__value--high {
  color: var(--color-warning);
}

/* ---------- Cost Breakdown Table ---------- */
.breakdown-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-4);
}

.breakdown-table th,
.breakdown-table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.breakdown-table th {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.breakdown-table td {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.breakdown-table td:last-child {
  text-align: right;
  font-weight: var(--weight-semibold);
  font-family: var(--font-mono);
  color: var(--color-text-primary);
}

.breakdown-table tr:hover td {
  background: var(--color-accent-subtle);
}

/* ---------- Cost Bar Chart ---------- */
.cost-bars {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.cost-bar {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.cost-bar__label {
  flex: 0 0 120px;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-align: right;
}

.cost-bar__track {
  flex: 1;
  height: 28px;
  background: var(--color-track-bg); /* Themed track bg */
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
}

.cost-bar__fill {
  height: 100%;
  background: var(--gradient-accent);
  border-radius: var(--radius-sm);
  transition: width 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
  align-items: center;
  padding: 0 var(--space-3);
  min-width: fit-content;
}

.cost-bar__amount {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  color: var(--color-text-inverse);
  font-family: var(--font-mono);
  white-space: nowrap;
}

/* ---------- FAQ Accordion ---------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--color-border-hover);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  background: var(--color-bg-secondary);
  border: none;
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  cursor: pointer;
  text-align: left;
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--color-bg-hover);
}

.faq-icon {
  font-size: var(--text-xl);
  color: var(--color-accent);
  transition: transform var(--transition-base);
  flex-shrink: 0;
  margin-left: var(--space-4);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer__inner {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* ---------- Calculator Grid ---------- */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

.calc-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.calc-card:hover {
  border-color: var(--color-border-accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-3px);
}

.calc-card__icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent-subtle);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-2xl);
}

.calc-card__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

.calc-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
}

.calc-card__cta {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.calc-card__cta::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.calc-card:hover .calc-card__cta::after {
  transform: translateX(4px);
}



/* ---------- Footer ---------- */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0 var(--space-8);
  margin-top: var(--space-16);
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-12);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.footer__brand-name {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
}

.footer__brand-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
  max-width: 320px;
}

.footer__heading {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-accent);
}

.footer__bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-align: center;
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-4) 0;
}

.breadcrumbs a {
  color: var(--color-text-muted);
}

.breadcrumbs a:hover {
  color: var(--color-accent);
}

.breadcrumbs__sep {
  color: var(--color-text-muted);
  opacity: 0.5;
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes countUp {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.animate-fade-in {
  animation: fadeInUp 0.5s ease forwards;
}

.animate-delay-1 { animation-delay: 0.1s; opacity: 0; }
.animate-delay-2 { animation-delay: 0.2s; opacity: 0; }
.animate-delay-3 { animation-delay: 0.3s; opacity: 0; }
.animate-delay-4 { animation-delay: 0.4s; opacity: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  :root {
    --text-4xl: 1.875rem;
    --text-5xl: 2.25rem;
  }

  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: block;
  }

  .nav__links--open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-6);
    gap: var(--space-4);
  }

  .container {
    padding: 0 var(--space-4);
  }

  .section {
    padding: var(--space-10) 0;
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .result-range {
    flex-direction: column;
    gap: var(--space-4);
  }

  .cost-bar__label {
    flex: 0 0 80px;
    font-size: var(--text-xs);
  }

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

@media (max-width: 480px) {
  .result-amount {
    font-size: var(--text-4xl);
  }
}

/* ---------- Accessibility & Interaction States ---------- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.calc-card,
.faq-question,
.btn,
.form-select,
.form-range {
  cursor: pointer;
}

/* Respect user's motion preferences */
@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;
  }
}