/* ==========================================================================
   Freefworlds — Design System
   Lightweight, dependency-free CSS. No external fonts, no frameworks.
   ========================================================================== */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f7f9;
  --color-surface: #ffffff;
  --color-border: #e3e6ea;
  --color-text: #1a1d23;
  --color-text-muted: #565d6b;
  --color-text-faint: #7b828f;
  --color-brand: #1f4fd8;
  --color-brand-dark: #16399f;
  --color-brand-contrast: #ffffff;
  --color-focus: #1f4fd8;
  --color-danger: #b3261e;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --max-width: 1120px;
  --radius: 8px;
  --radius-sm: 4px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 6rem;

  --shadow-sm: 0 1px 2px rgba(20, 24, 33, 0.06);
  --transition: 150ms ease;
}

/* ---------------------------------- Reset -------------------------------- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--color-brand);
  text-decoration: underline;
  text-decoration-color: rgba(31, 79, 216, 0.35);
  text-underline-offset: 2px;
}

a:hover {
  text-decoration-color: currentColor;
}

h1, h2, h3, h4 {
  line-height: 1.25;
  font-weight: 700;
  margin: 0 0 var(--space-3);
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 var(--space-3);
}

ul, ol {
  margin: 0 0 var(--space-3);
  padding-left: 1.25rem;
}

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

/* Visible focus states everywhere */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-brand);
  color: #fff;
  padding: var(--space-2) var(--space-3);
  z-index: 1000;
  border-radius: 0 0 var(--radius-sm) 0;
  text-decoration: none;
}

.skip-link:focus {
  left: 0;
}

/* ---------------------------------- Layout -------------------------------- */

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

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

.section-alt {
  background: var(--color-bg-alt);
}

.section-heading {
  max-width: 640px;
  margin: 0 0 var(--space-5);
}

.section-heading h2 {
  font-size: 1.75rem;
  margin-bottom: var(--space-2);
}

.section-heading p {
  color: var(--color-text-muted);
  margin: 0;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-brand);
  margin-bottom: var(--space-2);
}

/* ---------------------------------- Header -------------------------------- */

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

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-text);
  text-decoration: none;
}

.brand:hover {
  color: var(--color-brand);
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--color-brand);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links 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: var(--space-2);
  cursor: pointer;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

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

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

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

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

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

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: fixed;
    inset: 64px 0 0 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--color-bg);
    padding: var(--space-3) var(--space-4);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition);
  }

  .nav-links.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-links li {
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links a {
    display: block;
    padding: var(--space-3) 0;
  }

  body.nav-open {
    overflow: hidden;
  }
}

/* ---------------------------------- Buttons -------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

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

.btn-primary:hover {
  background: var(--color-brand-dark);
  text-decoration: none;
}

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

.btn-secondary:hover {
  border-color: var(--color-text);
  text-decoration: none;
}

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

/* ---------------------------------- Hero -------------------------------- */

.hero {
  padding: var(--space-8) 0 var(--space-7);
}

.hero-inner {
  max-width: 700px;
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  margin-bottom: var(--space-4);
}

.hero p.lede {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 560px;
  margin-bottom: var(--space-5);
}

/* ---------------------------------- Cards -------------------------------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}

.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-5);
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
}

.card p {
  color: var(--color-text-muted);
  flex-grow: 1;
}

.card-meta {
  font-size: 0.8125rem;
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-weight: 600;
}

.card-footer {
  margin-top: var(--space-3);
}

/* ---------------------------------- Callout -------------------------------- */

.callout {
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-5);
  background: var(--color-bg-alt);
}

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

/* ---------------------------------- Content pages -------------------------------- */

.page-header {
  padding: var(--space-7) 0 var(--space-5);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-alt);
}

.page-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: var(--space-2);
}

.page-header p {
  color: var(--color-text-muted);
  margin: 0;
  max-width: 640px;
}

.prose {
  max-width: 720px;
}

.prose h2 {
  font-size: 1.375rem;
  margin-top: var(--space-6);
}

.prose h2:first-child {
  margin-top: 0;
}

.prose h3 {
  font-size: 1.125rem;
  margin-top: var(--space-4);
}

.prose p,
.prose li {
  color: var(--color-text);
}

.meta-note {
  color: var(--color-text-faint);
  font-size: 0.875rem;
}

/* ---------------------------------- Contact -------------------------------- */

.contact-email {
  display: inline-block;
  font-size: 1.25rem;
  font-weight: 700;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-alt);
  margin: var(--space-3) 0 var(--space-5);
}

.contact-reasons {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
}

.contact-reasons li {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  margin: 0;
}

.contact-reasons strong {
  display: block;
  margin-bottom: var(--space-1);
}

/* ---------------------------------- Footer -------------------------------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-6) 0 var(--space-5);
  background: var(--color-bg-alt);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}

.footer-brand p {
  color: var(--color-text-muted);
  max-width: 320px;
  margin-top: var(--space-2);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-faint);
}

.footer-bottom a {
  color: var(--color-text-faint);
}

/* ---------------------------------- 404 -------------------------------- */

.error-page {
  padding: var(--space-8) 0;
  text-align: center;
}

.error-page .error-code {
  font-size: 4.5rem;
  font-weight: 800;
  color: var(--color-brand);
  margin-bottom: var(--space-2);
  line-height: 1;
}

.error-page .btn-row {
  justify-content: center;
  margin-top: var(--space-4);
}

/* ---------------------------------- Utilities -------------------------------- */

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

.mt-0 { margin-top: 0; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
  padding: 0;
  margin: -1px;
}

@media (max-width: 600px) {
  section {
    padding: var(--space-6) 0;
  }

  .hero {
    padding: var(--space-6) 0 var(--space-5);
  }
}