/* Purrplex Website — brand tokens & layout */

:root {
  --color-deep: #2e2860;
  --color-brand: #4b4297;
  --color-mid: #8b7fd1;
  --color-light: #c9c2f0;
  --color-surface: #f4f2fb;
  --color-ink: #1e1b33;
  --color-muted: #5c5678;
  --color-bg: #ffffff;
  --color-card: #ffffff;
  --color-border: #e4dff5;
  --color-accent-soft: rgba(75, 66, 151, 0.08);
  --shadow-sm: 0 1px 3px rgba(30, 27, 51, 0.06);
  --shadow-md: 0 8px 24px rgba(30, 27, 51, 0.1);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --font-display: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max-width: 1120px;
  --header-height: 72px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #12101f;
    --color-card: #1c1930;
    --color-border: #2e2860;
    --color-surface: #1c1930;
    --color-ink: #f4f2fb;
    --color-muted: #a9a3c4;
    --color-accent-soft: rgba(139, 127, 209, 0.15);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-bg);
}

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

a {
  color: var(--color-brand);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 200;
  padding: 0.5rem 1rem;
  background: var(--color-brand);
  color: #fff;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 1rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-ink);
  font-weight: 700;
  font-size: 1.125rem;
}

.logo-link:hover {
  text-decoration: none;
}

.logo-link img {
  height: 40px;
  width: auto;
}

.site-nav ul {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--color-muted);
  font-weight: 500;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-brand);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--color-ink);
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4rem 0;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 800;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.section-lead {
  color: var(--color-muted);
  font-size: 1.125rem;
  margin: 0 0 2.5rem;
  max-width: 42rem;
}

/* Hero */
.hero {
  padding: 5rem 0 4rem;
  background: linear-gradient(
    165deg,
    var(--color-surface) 0%,
    var(--color-bg) 55%,
    color-mix(in srgb, var(--color-brand) 6%, var(--color-bg)) 100%
  );
}

.hero-inner {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr 1fr;
  }
}

.hero-logo {
  max-width: 320px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 1rem;
  letter-spacing: -0.03em;
}

.hero-tagline {
  font-size: 1.25rem;
  color: var(--color-muted);
  margin: 0 0 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, border-color 0.15s, opacity 0.15s;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--color-brand);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-deep);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--color-brand);
  border-color: var(--color-brand);
}

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

.btn-disabled,
.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* Category groups */
.category-group {
  margin-bottom: 3rem;
}

.category-group:last-child {
  margin-bottom: 0;
}

.category-heading {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-brand);
  margin: 0 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
}

/* App cards */
.apps-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 600px) {
  .apps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .apps-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.app-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s, transform 0.2s;
}

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

.app-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.app-card h3 {
  margin: 0 0 0.25rem;
  font-size: 1.125rem;
  font-weight: 700;
}

.app-card-tagline {
  color: var(--color-brand);
  font-size: 0.875rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
}

.app-card-blurb {
  color: var(--color-muted);
  font-size: 0.9375rem;
  margin: 0 0 1.25rem;
  flex: 1;
}

.app-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Package cards (open source page) */
.packages-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 600px) {
  .packages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .packages-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.package-card {
  background: var(--color-card);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.package-card h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
  font-weight: 700;
  font-family: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, monospace;
  color: var(--color-brand);
}

.package-path {
  margin: 0 0 0.75rem;
  font-size: 0.8125rem;
  color: var(--color-muted);
  font-family: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, monospace;
}

.package-blurb {
  color: var(--color-muted);
  font-size: 0.9375rem;
  margin: 0 0 1.25rem;
  flex: 1;
}

.package-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.status-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-accent-soft);
  color: var(--color-brand);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.usage-note {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 3rem;
}

.usage-note h2 {
  margin: 0 0 0.75rem;
  font-size: 1.125rem;
}

.usage-note p {
  margin: 0 0 0.75rem;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.usage-note p:last-child {
  margin-bottom: 0;
}

.usage-note code {
  font-family: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, monospace;
  font-size: 0.875rem;
  background: var(--color-accent-soft);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
}

.opensource-teaser {
  text-align: center;
  padding: 3rem 1.5rem;
  margin-top: 2rem;
}

.opensource-teaser p {
  color: var(--color-muted);
  max-width: 36rem;
  margin: 0 auto 1.25rem;
}

/* Why strip */
.why-strip {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.why-grid {
  display: grid;
  gap: 2rem;
}

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

.why-item h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 700;
}

.why-item p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

/* Give-back teaser */
.giveback-teaser {
  text-align: center;
  padding: 4rem 1.5rem;
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--color-brand) 12%, var(--color-bg)) 0%,
    var(--color-surface) 100%
  );
  border-radius: var(--radius-lg);
  margin: 0 1.5rem;
  max-width: calc(var(--max-width) - 3rem);
  margin-left: auto;
  margin-right: auto;
}

.giveback-teaser h2 {
  margin: 0 0 0.75rem;
  font-size: 1.75rem;
}

.giveback-teaser p {
  color: var(--color-muted);
  max-width: 36rem;
  margin: 0 auto 1.5rem;
}

/* Footer */
.site-footer {
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--color-border);
  margin-top: 4rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: center;
  text-align: center;
}

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

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.footer-copy {
  color: var(--color-muted);
  font-size: 0.875rem;
  margin: 0;
}

/* Donate page */
.concept-banner {
  background: color-mix(in srgb, var(--color-brand) 15%, var(--color-surface));
  border: 1px solid var(--color-mid);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 2.5rem;
  font-size: 0.9375rem;
}

.concept-banner strong {
  color: var(--color-brand);
}

.pillar-grid {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

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

.pillar-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.pillar-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.pillar-card p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.vouch-list {
  list-style: none;
  padding: 0;
  margin: 0 0 3rem;
}

.vouch-list li {
  padding: 0.75rem 0 0.75rem 1.75rem;
  position: relative;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
}

.vouch-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-brand);
  font-weight: 700;
}

.merch-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

.merch-card {
  background: var(--color-card);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem 1.5rem;
  text-align: center;
}

.merch-card-placeholder {
  width: 80px;
  height: 80px;
  margin: 0 auto 1rem;
  background: var(--color-accent-soft);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.merch-card h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.merch-badge {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.25rem 0.75rem;
  background: var(--color-accent-soft);
  color: var(--color-brand);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.program-list {
  display: grid;
  gap: 1rem;
  margin-bottom: 3rem;
}

.program-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
}

.program-item h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.program-focus {
  color: var(--color-brand);
  font-size: 0.8125rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.program-item p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

/* Mobile nav */
@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.5rem;
    display: none;
  }

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

  .site-nav ul {
    flex-direction: column;
    gap: 0.75rem;
  }
}