/* MacTrade public site — system fonts, light/dark, mobile-first */

:root {
  color-scheme: light dark;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --color-bg: #f5f5f7;
  --color-surface: #ffffff;
  --color-text: #1d1d1f;
  --color-muted: #6e6e73;
  --color-border: #d2d2d7;
  --color-link: #0066cc;
  --color-link-hover: #004499;
  --color-accent: #0071e3;
  --color-focus: #0071e3;
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.06);
  --radius: 12px;
  --max-width: 720px;
  --header-height: 3.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #000000;
    --color-surface: #1c1c1e;
    --color-text: #f5f5f7;
    --color-muted: #a1a1a6;
    --color-border: #38383a;
    --color-link: #2997ff;
    --color-link-hover: #66b3ff;
    --color-accent: #0a84ff;
    --color-focus: #0a84ff;
    --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.4);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

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

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  padding: 0.75rem 1rem;
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  border-radius: 0 0 var(--radius) 0;
}

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

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

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

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  min-height: var(--header-height);
  padding-block: 0.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-text);
  text-decoration: none;
  margin-right: auto;
}

.brand img {
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: inline-block;
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.925rem;
}

.site-nav a:hover {
  background: color-mix(in srgb, var(--color-border) 40%, transparent);
}

.site-nav a[aria-current="page"] {
  font-weight: 600;
  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
}

.lang-switch {
  font-size: 0.875rem;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  text-decoration: none;
  color: var(--color-text);
  white-space: nowrap;
}

.lang-switch:hover {
  border-color: var(--color-accent);
}

.site-main {
  flex: 1;
  padding-block: 2rem 3rem;
}

.hero {
  text-align: center;
  margin-bottom: 2rem;
}

.hero-icon {
  border-radius: 22%;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.2;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.lead {
  font-size: 1.125rem;
  color: var(--color-muted);
  margin: 0 auto;
  max-width: 38ch;
}

.prose {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.prose h2 {
  font-size: 1.25rem;
  margin: 2rem 0 0.75rem;
  line-height: 1.3;
}

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

.prose h3 {
  font-size: 1.05rem;
  margin: 1.5rem 0 0.5rem;
}

.prose p,
.prose ul,
.prose ol {
  margin: 0 0 1rem;
}

.prose ul,
.prose ol {
  padding-left: 1.25rem;
}

.prose li + li {
  margin-top: 0.35rem;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: color-mix(in srgb, var(--color-border) 35%, transparent);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.notice {
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 8%, transparent);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding-block: 1.5rem 2rem;
  font-size: 0.875rem;
  color: var(--color-muted);
}

.footer-inner p {
  margin: 0 0 0.5rem;
}

.footer-operator {
  color: var(--color-text);
  font-weight: 500;
}

@media (min-width: 768px) {
  .header-inner {
    flex-wrap: nowrap;
  }

  .site-nav ul {
    gap: 0.5rem 1rem;
  }

  .prose {
    padding: 2rem;
  }
}

@media (min-width: 1280px) {
  :root {
    --max-width: 760px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

@media print {
  .site-header,
  .lang-switch,
  .skip-link {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  .prose {
    box-shadow: none;
    border: 1px solid #ccc;
  }

  a[href^="mailto:"]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
  }
}