/*
  StarStack minimal styles
  - Light/Dark theme via [data-theme]
  - Responsive layout and mobile navigation
  - Focus-visible and accessible sizes
*/

:root {
  --bg: #ffffff;
  --text: #0f1222;
  --muted: #6a6f85;
  --surface: #f4f6fb;
  --border: #e5e8f0;
  --primary: #3b82f6;
  --primary-contrast: #ffffff;
}

/* Dark theme overrides */
body[data-theme="dark"] {
  --bg: #0e1016;
  --text: #e7eaf3;
  --muted: #98a0b3;
  --surface: #171a23;
  --border: #242938;
  --primary: #60a5fa;
  --primary-contrast: #0b1020;
}

/* Base */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header, .site-footer {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.site-footer { border-top: 1px solid var(--border); border-bottom: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header, .site-footer, main, .section, .hero {
  padding-left: 16px;
  padding-right: 16px;
}

.site-header { display: flex; align-items: center; justify-content: space-between; height: 56px; }

.logo {
  font-weight: 800;
  color: var(--text);
}

.header-actions { display: flex; align-items: center; gap: 8px; }

.lang-btn, .theme-toggle, .nav-toggle {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
}

.lang-btn[aria-pressed="true"], .theme-toggle[aria-pressed="true"] {
  background: var(--primary);
  color: var(--primary-contrast);
  border-color: transparent;
}

.nav { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; }

.nav-menu { list-style: none; display: flex; gap: 16px; margin: 0; padding: 0; }
.nav-menu a { color: var(--text); }
.nav-menu a:hover { color: var(--primary); }

/* Hero */
.hero { padding: 56px 16px; text-align: center; background: var(--surface); }
.hero h1 { font-size: clamp(28px, 5vw, 48px); margin: 0 0 8px; }
.hero p { color: var(--muted); margin: 0 0 16px; }

.cta {
  display: inline-block;
  background: var(--primary);
  color: var(--primary-contrast);
  padding: 10px 16px;
  border-radius: 10px;
  font-weight: 600;
}

.link { color: var(--primary); font-weight: 600; }

.section { padding: 40px 16px; max-width: 1100px; margin: 0 auto; }

.cards { display: grid; grid-template-columns: repeat(12, 1fr); gap: 16px; }
.card {
  grid-column: span 12;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg);
}

/* Footer */
.site-footer { padding: 24px 16px; text-align: center; color: var(--muted); }

/* Responsive */
@media (min-width: 720px) {
  .hero { text-align: left; padding: 72px 16px; }
  .cards .card { grid-column: span 6; }
}

/* Mobile navigation collapse */
@media (max-width: 719px) {
  .nav-toggle { display: inline-block; }
  .nav-menu { 
    position: absolute;
    top: 56px; left: 0; right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: none;
    flex-direction: column;
    gap: 0;
  }
  .nav-menu.is-open { display: flex; }
  .nav-menu li { border-top: 1px solid var(--border); }
  .nav-menu a { display: block; padding: 12px 16px; }
}

/* Accessibility */
:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }

.meta { color: var(--muted); font-size: 14px; }

/* Базовые переменные и темы */
:root {
  --bg: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-contrast: #ffffff;
  --card: #f8fafc;
  --border: #e2e8f0;
  --shadow: 0 8px 24px rgba(2, 6, 23, 0.08);
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --primary: #60a5fa;
  --primary-contrast: #0b1220;
  --card: #0f172a;
  --border: #1f2937;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell,
    Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Шапка */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(8px);
  background: color-mix(in oklab, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
}
.logo {
  font-weight: 800;
  letter-spacing: 0.2px;
  color: var(--text);
  text-decoration: none;
}

.nav { display: flex; align-items: center; gap: 12px; }
.nav-menu { list-style: none; display: flex; gap: 16px; margin: 0; padding: 0; }
.nav-menu a { color: var(--text); text-decoration: none; padding: 6px 10px; border-radius: 8px; }
.nav-menu a:hover { background: var(--card); }
.nav-menu a[aria-current="page"] { background: var(--card); color: var(--primary); box-shadow: inset 0 0 0 1px var(--border); }

.header-actions { display: flex; align-items: center; gap: 8px; }
.nav-toggle { display: none; border: 1px solid var(--border); background: var(--card); color: var(--text); border-radius: 10px; padding: 6px 10px; }
.theme-toggle { border: 1px solid var(--border); background: var(--card); color: var(--text); border-radius: 10px; padding: 6px 10px; }
.lang-select { border: 1px solid var(--border); background: var(--card); color: var(--text); border-radius: 10px; padding: 6px 10px; }
.lang-switch { display: inline-flex; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--card); }
.lang-btn { padding: 6px 10px; background: transparent; color: var(--text); border: 0; cursor: pointer; }
.lang-btn[aria-pressed="true"] { background: var(--primary); color: var(--primary-contrast); }
.theme-toggle:hover, .nav-toggle:hover, .lang-select:hover, .lang-btn:hover { filter: brightness(1.02); }

@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .nav-menu { display: none; position: absolute; right: 12px; top: 56px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); padding: 10px; flex-direction: column; gap: 8px; }
  .nav-menu.open { display: flex; }
}

/* Герой */
.hero {
  padding: 64px 20px 48px;
  text-align: center;
  background: radial-gradient(60% 50% at 50% 0%, color-mix(in oklab, var(--primary) 20%, transparent), transparent),
              linear-gradient(180deg, color-mix(in oklab, var(--primary) 6%, var(--bg)) 0%, var(--bg) 60%);
}
.hero h1 { font-size: clamp(28px, 6vw, 44px); line-height: 1.15; margin: 0 0 12px; }
.hero p { margin: 0 0 22px; color: var(--muted); }
.cta {
  display: inline-block;
  background: var(--primary);
  color: var(--primary-contrast);
  text-decoration: none;
  padding: 10px 16px;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

/* Блоки */
.section { padding: 40px 20px; max-width: 1040px; margin: 0 auto; }
.section h2 { margin-top: 0; font-size: clamp(22px, 5vw, 32px); }
.cards { display: grid; grid-template-columns: repeat(12, 1fr); gap: 16px; }
.card {
  grid-column: span 6;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  box-shadow: var(--shadow);
}
.card h3 { margin-top: 0; }
.card .link { color: var(--primary); text-decoration: none; }
.card .link:hover { text-decoration: underline; }

@media (max-width: 760px) {
  .card { grid-column: span 12; }
}

/* Подвал */
.site-footer { border-top: 1px solid var(--border); padding: 20px; text-align: center; color: var(--muted); }

/* Доступность */
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 8px; }

/* Хлебные крошки */
.breadcrumbs { padding: 8px 20px; color: var(--muted); font-size: 14px; }
.breadcrumbs a { color: var(--muted); }
.breadcrumbs .sep { margin: 0 6px; opacity: .6; }