/* ==========================================================================
   LandscapeCalc.com.au - Design System & Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   Google Fonts
   -------------------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,700;1,9..40,400&family=Fraunces:opsz,wght@9..144,400;9..144,600;9..144,700&display=swap');

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Primary Colors */
  --color-forest-green: #2D5A3D;
  --color-forest-green-dark: #1E3D29;
  --color-forest-green-light: #4A7D5C;

  /* Accent Colors */
  --color-terracotta: #C65D3B;
  --color-terracotta-dark: #A84D2F;
  --color-terracotta-light: #E07A5A;

  /* Neutrals */
  --color-white: #FFFFFF;
  --color-off-white: #F8F7F4;
  --color-cream: #F0EDE6;
  --color-grey-100: #E8E5DE;
  --color-grey-200: #D1CCC2;
  --color-grey-300: #A8A197;
  --color-grey-400: #7A746A;
  --color-grey-500: #5C574F;
  --color-grey-600: #3D3A35;
  --color-grey-700: #2A2825;
  --color-black: #1A1918;

  /* Material Colors */
  --color-mulch: #8B4513;
  --color-soil: #3E2723;
  --color-gravel: #757575;
  --color-sand: #D2B48C;
  --color-roadbase: #4A4A4A;

  /* Semantic Colors */
  --color-success: #2E7D32;
  --color-error: #C62828;
  --color-error-bg: #FFEBEE;
  --color-warning: #F57C00;

  /* Typography */
  --font-heading: 'Fraunces', Georgia, serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Type Scale */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */

  /* Spacing (4px base) */
  --space-1: 0.25rem;      /* 4px */
  --space-2: 0.5rem;       /* 8px */
  --space-3: 0.75rem;      /* 12px */
  --space-4: 1rem;         /* 16px */
  --space-5: 1.25rem;      /* 20px */
  --space-6: 1.5rem;       /* 24px */
  --space-8: 2rem;         /* 32px */
  --space-10: 2.5rem;      /* 40px */
  --space-12: 3rem;        /* 48px */
  --space-16: 4rem;        /* 64px */
  --space-20: 5rem;        /* 80px */
  --space-24: 6rem;        /* 96px */

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --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, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Layout */
  --container-max: 1200px;
  --header-height: 72px;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*, *::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-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-grey-700);
  background-color: var(--color-off-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

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

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

a:hover {
  color: var(--color-forest-green-dark);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, select {
  font-family: inherit;
  font-size: inherit;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-grey-700);
}

h1 {
  font-size: var(--text-3xl);
  font-weight: 700;
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-xl);
}

h4 {
  font-size: var(--text-lg);
}

p {
  margin-bottom: var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

.text-sm {
  font-size: var(--text-sm);
}

.text-lg {
  font-size: var(--text-lg);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

.section {
  padding: var(--space-12) 0;
}

@media (min-width: 768px) {
  .section {
    padding: var(--space-16) 0;
  }
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-grey-100);
  height: var(--header-height);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-forest-green);
}

.header__logo:hover {
  color: var(--color-forest-green);
}

.header__logo svg {
  width: 32px;
  height: 32px;
}

.header__nav {
  display: none;
}

@media (min-width: 768px) {
  .header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-6);
  }
}

.header__nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-grey-500);
}

.header__nav a:hover {
  color: var(--color-forest-green);
}

.header__mobile-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-grey-600);
}

@media (min-width: 768px) {
  .header__mobile-toggle {
    display: none;
  }
}

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-grey-100);
  padding: var(--space-4);
  z-index: 99;
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav a {
  display: block;
  padding: var(--space-3) 0;
  font-weight: 500;
  color: var(--color-grey-600);
  border-bottom: 1px solid var(--color-grey-100);
}

.mobile-nav a:last-child {
  border-bottom: none;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  background: linear-gradient(135deg, var(--color-forest-green) 0%, var(--color-forest-green-dark) 100%);
  padding: var(--space-10) 0 var(--space-24);
  text-align: center;
  color: var(--color-white);
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.hero__subtitle {
  font-size: var(--text-lg);
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto var(--space-6);
}

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(255, 255, 255, 0.15);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
}

.hero__badge svg {
  width: 16px;
  height: 16px;
}

@media (min-width: 768px) {
  .hero {
    padding: var(--space-16) 0 var(--space-24);
  }

  h1 {
    font-size: var(--text-4xl);
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: var(--text-5xl);
  }
}

/* --------------------------------------------------------------------------
   Calculator Card
   -------------------------------------------------------------------------- */
.calculator-wrapper {
  margin-top: calc(-1 * var(--space-16));
  padding: 0 var(--space-4);
  position: relative;
  z-index: 10;
}

.calculator-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  max-width: 600px;
  margin: 0 auto;
}

.calculator-card__header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-grey-100);
}

.calculator-card__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
  text-align: center;
}

/* Material Tabs */
.material-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

.material-tab {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-grey-500);
  background: var(--color-grey-100);
  transition: all var(--transition-fast);
}

.material-tab:hover {
  background: var(--color-grey-200);
  color: var(--color-grey-600);
}

.material-tab.is-active {
  background: var(--color-forest-green);
  color: var(--color-white);
}

.material-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
}

.material-dot--mulch {
  background: var(--color-mulch);
}

.material-dot--soil {
  background: var(--color-soil);
}

.material-dot--gravel {
  background: var(--color-gravel);
}

.material-dot--sand {
  background: var(--color-sand);
}

.material-dot--roadbase {
  background: var(--color-roadbase);
}

/* Calculator Body */
.calculator-card__body {
  padding: var(--space-6);
}

/* Shape Toggle */
.shape-toggle {
  display: flex;
  background: var(--color-grey-100);
  border-radius: var(--radius-md);
  padding: var(--space-1);
  margin-bottom: var(--space-6);
}

.shape-toggle__btn {
  flex: 1;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-grey-500);
  transition: all var(--transition-fast);
}

.shape-toggle__btn:hover {
  color: var(--color-grey-600);
}

.shape-toggle__btn.is-active {
  background: var(--color-white);
  color: var(--color-grey-700);
  box-shadow: var(--shadow-sm);
}

/* Form Elements */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-grey-600);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--color-grey-200);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-grey-700);
  background: var(--color-white);
  transition: border-color var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-forest-green);
}

.form-input::placeholder {
  color: var(--color-grey-300);
}

.form-input.is-error {
  border-color: var(--color-error);
  background: var(--color-error-bg);
}

.form-error {
  display: none;
  font-size: var(--text-sm);
  color: var(--color-error);
  margin-top: var(--space-1);
}

.form-input.is-error + .form-error {
  display: block;
}

.form-hint {
  font-size: var(--text-sm);
  color: var(--color-grey-400);
  margin-top: var(--space-1);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

/* Select */
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--color-grey-200);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-grey-700);
  background: var(--color-white);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%237A746A' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-10);
}

.form-select:focus {
  outline: none;
  border-color: var(--color-forest-green);
}

/* Depth Presets */
.depth-presets {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.depth-chip {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  background: var(--color-grey-100);
  color: var(--color-grey-500);
  transition: all var(--transition-fast);
}

.depth-chip:hover {
  background: var(--color-grey-200);
  color: var(--color-grey-600);
}

.depth-chip.is-active {
  background: var(--color-terracotta);
  color: var(--color-white);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 600;
  transition: all var(--transition-fast);
  min-height: 48px;
}

.btn--primary {
  background: var(--color-forest-green);
  color: var(--color-white);
}

.btn--primary:hover {
  background: var(--color-forest-green-dark);
  color: var(--color-white);
}

.btn--secondary {
  background: var(--color-grey-100);
  color: var(--color-grey-600);
}

.btn--secondary:hover {
  background: var(--color-grey-200);
}

.btn--outline {
  background: transparent;
  border: 2px solid var(--color-grey-200);
  color: var(--color-grey-600);
}

.btn--outline:hover {
  border-color: var(--color-grey-300);
  background: var(--color-grey-100);
}

.btn--outline.is-success {
  border-color: var(--color-forest-green);
  background: var(--color-forest-green);
  color: var(--color-white);
}

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

.btn-group {
  display: flex;
  gap: var(--space-3);
}

.btn-group .btn {
  flex: 1;
}

/* Result Card */
.result-card {
  display: none;
  background: var(--color-cream);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-top: var(--space-6);
  text-align: center;
}

.result-card.is-visible {
  display: block;
}

.result-card__primary {
  margin-bottom: var(--space-4);
}

.result-card__value {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--color-forest-green);
}

.result-card__unit {
  font-size: var(--text-lg);
  color: var(--color-grey-500);
}

.result-card__label {
  font-size: var(--text-sm);
  color: var(--color-grey-500);
  margin-top: var(--space-1);
}

.result-card__secondary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-grey-200);
  margin-bottom: var(--space-4);
}

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

.result-card__item-value {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-grey-700);
}

.result-card__item-label {
  font-size: var(--text-xs);
  color: var(--color-grey-400);
  margin-top: var(--space-1);
}

.result-card__actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

.result-card__actions .btn {
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-4);
  min-height: auto;
}

/* Collapsible */
.collapsible {
  margin-top: var(--space-6);
  border-top: 1px solid var(--color-grey-100);
  padding-top: var(--space-4);
}

.collapsible__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-grey-500);
  padding: var(--space-2) 0;
}

.collapsible__trigger svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-fast);
}

.collapsible__trigger.is-open svg {
  transform: rotate(180deg);
}

.collapsible__content {
  display: none;
  padding-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-grey-500);
  line-height: 1.7;
}

.collapsible__content.is-open {
  display: block;
}

/* --------------------------------------------------------------------------
   Material Cards Section
   -------------------------------------------------------------------------- */
.material-cards {
  padding: var(--space-12) 0;
}

.material-cards__title {
  text-align: center;
  margin-bottom: var(--space-8);
}

.material-cards__grid {
  display: grid;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .material-cards__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .material-cards__grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.material-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-6);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
}

.material-card:hover {
  border-color: var(--color-forest-green);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: inherit;
}

.material-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.material-card__icon--mulch {
  background: var(--color-mulch);
}

.material-card__icon--soil {
  background: var(--color-soil);
}

.material-card__icon--gravel {
  background: var(--color-gravel);
}

.material-card__icon--sand {
  background: var(--color-sand);
}

.material-card__icon--roadbase {
  background: var(--color-roadbase);
}

.material-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-grey-700);
  margin-bottom: var(--space-2);
}

.material-card__desc {
  font-size: var(--text-sm);
  color: var(--color-grey-400);
}

/* --------------------------------------------------------------------------
   Features Section
   -------------------------------------------------------------------------- */
.features {
  background: var(--color-forest-green);
  color: var(--color-white);
  padding: var(--space-12) 0;
}

.features__title {
  text-align: center;
  color: var(--color-white);
  margin-bottom: var(--space-8);
}

.features__grid {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .features__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature {
  text-align: center;
}

.feature__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature__icon svg {
  width: 24px;
  height: 24px;
}

.feature__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.feature__desc {
  font-size: var(--text-sm);
  opacity: 0.8;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  background: var(--color-grey-700);
  color: var(--color-grey-300);
  padding: var(--space-8) 0;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-white);
}

.footer__logo svg {
  width: 24px;
  height: 24px;
}

.footer__links {
  display: flex;
  gap: var(--space-6);
}

.footer__links a {
  font-size: var(--text-sm);
  color: var(--color-grey-300);
}

.footer__links a:hover {
  color: var(--color-white);
}

.footer__copyright {
  font-size: var(--text-sm);
}

/* --------------------------------------------------------------------------
   Breadcrumb
   -------------------------------------------------------------------------- */
.breadcrumb {
  padding: var(--space-4) 0;
  font-size: var(--text-sm);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
}

.breadcrumb__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.breadcrumb__item:not(:last-child)::after {
  content: '/';
  color: var(--color-grey-300);
}

.breadcrumb__link {
  color: var(--color-grey-500);
}

.breadcrumb__link:hover {
  color: var(--color-forest-green);
}

.breadcrumb__current {
  color: var(--color-grey-700);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Page Header
   -------------------------------------------------------------------------- */
.page-header {
  background: linear-gradient(135deg, var(--color-forest-green) 0%, var(--color-forest-green-dark) 100%);
  padding: var(--space-8) 0 var(--space-24);
  color: var(--color-white);
}

.page-header h1 {
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.page-header p {
  opacity: 0.9;
  max-width: 700px;
}

/* --------------------------------------------------------------------------
   Content Section
   -------------------------------------------------------------------------- */
.content-section {
  padding: var(--space-8) 0;
}

.content-section h2 {
  margin-bottom: var(--space-4);
}

.content-section h3 {
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.content-section p {
  color: var(--color-grey-600);
  margin-bottom: var(--space-4);
}

.content-section ul, .content-section ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
  color: var(--color-grey-600);
}

.content-section li {
  margin-bottom: var(--space-2);
}

/* --------------------------------------------------------------------------
   FAQ Section
   -------------------------------------------------------------------------- */
.faq-section {
  background: var(--color-cream);
  padding: var(--space-12) 0;
}

.faq-section__title {
  text-align: center;
  margin-bottom: var(--space-8);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  overflow: hidden;
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-5);
  text-align: left;
  font-weight: 600;
  color: var(--color-grey-700);
}

.faq-item__question svg {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-grey-400);
  transition: transform var(--transition-fast);
}

.faq-item__question.is-open svg {
  transform: rotate(180deg);
}

.faq-item__answer {
  display: none;
  padding: 0 var(--space-5) var(--space-5);
  color: var(--color-grey-600);
}

.faq-item__answer.is-open {
  display: block;
}

/* --------------------------------------------------------------------------
   Related Calculators
   -------------------------------------------------------------------------- */
.related-section {
  padding: var(--space-12) 0;
}

.related-section__title {
  text-align: center;
  margin-bottom: var(--space-6);
}

.related-grid {
  display: grid;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .related-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --------------------------------------------------------------------------
   About Page
   -------------------------------------------------------------------------- */
.about-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-4);
}

.about-content h2 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-4);
}

.about-content p {
  color: var(--color-grey-600);
}

/* --------------------------------------------------------------------------
   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;
}

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

/* Toast notification */
.toast {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-grey-700);
  color: var(--color-white);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  font-size: var(--text-sm);
  font-weight: 500;
  opacity: 0;
  transition: all var(--transition-slow);
  z-index: 1000;
}

.toast.is-visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}