/* ============================================
   Withdraw Collective — Style Sheet
   Single stylesheet, CSS variables, mobile-first
   ============================================ */

/* --- CSS Variables --- */
:root {
  /* Colors — muted, grounded palette */
  --color-bg: #f7f5f2;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #4a4a4a;
  --color-text-muted: #767676;
  --color-accent: #2c2c2c;
  --color-accent-hover: #444444;
  --color-border: #d4d0cb;
  --color-border-light: #e8e5e0;
  --color-highlight: #3a3a3a;

  /* Typography */
  --font-heading: 'Georgia', 'Times New Roman', serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;

  /* Type Scale */
  --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: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.25rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Layout */
  --max-width: 72rem;
  --content-width: 42rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  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-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 400;
  line-height: 1.2;
  color: var(--color-text);
}

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

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

/* --- Navigation --- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  text-decoration: none;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.nav-logo:hover {
  color: var(--color-text);
}

.nav-links {
  display: none;
  gap: var(--space-xl);
}

.nav-links a {
  font-size: var(--text-sm);
  text-decoration: none;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--color-text);
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: currentColor;
  position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background-color: currentColor;
  position: absolute;
  left: 0;
  transition: transform var(--transition-fast);
}

.nav-toggle span::before {
  top: -6px;
}

.nav-toggle span::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] span {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] span::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span::after {
  top: 0;
  transform: rotate(-45deg);
}

/* Mobile menu */
.nav-mobile {
  display: none;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
  background-color: var(--color-bg);
}

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

.nav-mobile a {
  font-size: var(--text-base);
  text-decoration: none;
  color: var(--color-text-secondary);
  padding: var(--space-sm) 0;
}

.nav-mobile a:hover {
  color: var(--color-text);
}

/* Desktop nav */
@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }

  .nav-mobile {
    display: none !important;
  }
}

/* --- Sections --- */
.section {
  padding: var(--space-4xl) 0;
}

.section--hero {
  padding: var(--space-5xl) 0;
}

.section + .section {
  border-top: 1px solid var(--color-border-light);
}

.section-header {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-xl);
}

.section-body {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.section-body p + p {
  margin-top: var(--space-lg);
}

/* --- Hero --- */
.hero-headline {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.02em;
}

.hero-subhead {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 36rem;
  margin-bottom: var(--space-2xl);
}

@media (min-width: 768px) {
  .hero-headline {
    font-size: var(--text-5xl);
  }

  .hero-subhead {
    font-size: var(--text-2xl);
  }
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  text-decoration: none;
  padding: var(--space-md) var(--space-xl);
  border: 2px solid var(--color-accent);
  background-color: var(--color-accent);
  color: var(--color-bg);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

.btn--outline {
  background-color: transparent;
  color: var(--color-accent);
}

.btn--outline:hover {
  background-color: var(--color-accent);
  color: var(--color-bg);
}

/* --- Cards --- */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

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

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  padding: var(--space-xl);
}

.card-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  background-color: var(--color-border-light);
  margin-bottom: var(--space-lg);
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.card-meta {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.card-body {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.card-replaces {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.card-price {
  font-size: var(--text-lg);
  font-weight: 500;
  margin-bottom: var(--space-md);
}

.card-actions {
  margin-top: var(--space-lg);
}

/* --- Page Header --- */
.page-header {
  padding: var(--space-4xl) 0 var(--space-2xl);
}

.page-header h1 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-md);
}

.page-header .subhead {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 36rem;
  line-height: 1.6;
}

@media (min-width: 768px) {
  .page-header h1 {
    font-size: var(--text-4xl);
  }
}

/* --- Notice Banner --- */
.notice {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-lg) var(--space-xl);
  margin: var(--space-xl) 0;
  text-align: center;
}

.notice p {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

/* --- FAQ --- */
.faq-list {
  max-width: var(--content-width);
}

.faq-item {
  border-bottom: 1px solid var(--color-border-light);
  padding: var(--space-xl) 0;
}

.faq-question {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  margin-bottom: var(--space-md);
}

.faq-answer {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* --- Category Filter --- */
.category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}

.category-btn {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border);
  background-color: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.category-btn:hover,
.category-btn.is-active {
  background-color: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

/* --- Transparency / Standards Lists --- */
.standards-list {
  list-style: none;
  padding: 0;
}

.standards-list li {
  padding: var(--space-sm) 0;
  padding-left: var(--space-lg);
  position: relative;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.standards-list li::before {
  content: '\2014';
  position: absolute;
  left: 0;
}

/* --- Membership Form Area --- */
.join-form {
  max-width: 28rem;
  margin-top: var(--space-2xl);
}

.join-form .form-note {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-md);
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-2xl) 0;
  margin-top: var(--space-4xl);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-text);
}

.footer-note {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}