/*
  mxchat.cz — design system
  Copyright (C) 2024 Oscloud — GPLv3+

  Vercel/Linear inspired. Dark-first with light toggle.
  OSCloud blue (#1565c0) as primary accent.
*/

@import url("https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600&family=Geist+Mono:wght@400&display=swap");

/* ============================================
   TOKENS
   ============================================ */
:root {
  --font-body: "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "Geist Mono", "JetBrains Mono", "Fira Code", monospace;

  --accent: #1565c0;
  --accent-light: #1e88e5;
  --accent-hover: #1976d2;
  --accent-subtle: rgba(21, 101, 192, 0.12);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  --transition: 0.2s ease;
  --max-width: 720px;
  --nav-height: 56px;
}

/* ---------- DARK (default) ---------- */
:root,
[data-theme="dark"] {
  --bg: #09090b;
  --bg-elevated: #111113;
  --bg-card: #161618;
  --bg-card-hover: #1c1c1f;

  --text: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --text-dim: #52525b;

  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.18);

  --badge-bg: rgba(21, 101, 192, 0.15);
  --badge-text: #42a5f5;
  --code-bg: rgba(255, 255, 255, 0.06);

  --toggle-icon: "☀";
  color-scheme: dark;
}

/* ---------- LIGHT ---------- */
[data-theme="light"] {
  --bg: #ffffff;
  --bg-elevated: #f8f8fa;
  --bg-card: #ffffff;
  --bg-card-hover: #f4f4f5;

  --text: #18181b;
  --text-secondary: #52525b;
  --text-muted: #71717a;
  --text-dim: #a1a1aa;

  --border: rgba(0, 0, 0, 0.06);
  --border-hover: rgba(0, 0, 0, 0.1);
  --border-strong: rgba(0, 0, 0, 0.15);

  --badge-bg: rgba(21, 101, 192, 0.08);
  --badge-text: #1565c0;
  --code-bg: rgba(0, 0, 0, 0.04);

  --toggle-icon: "🌙";
  color-scheme: light;
}

/* ============================================
   RESET
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  transition: background var(--transition), color var(--transition);
}
img { max-width: 100%; display: block; }
a { color: var(--accent-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); text-decoration: underline; }

/* ============================================
   NAV
   ============================================ */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 24px;
  background: var(--bg);
  border-bottom: 0.5px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}
.nav-logo:hover { text-decoration: none; color: var(--text); }
.nav-logo-icon {
  width: 28px;
  height: 28px;
  background: var(--accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
}
.nav-logo-text {
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-link {
  font-size: 13px;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  text-decoration: none;
}
.nav-link:hover {
  color: var(--text);
  background: var(--bg-card);
  text-decoration: none;
}
.nav-cta {
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  background: var(--accent);
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background var(--transition);
}
.nav-cta:hover { background: var(--accent-hover); text-decoration: none; color: #fff; }

/* Theme toggle */
.theme-toggle {
  width: 32px;
  height: 32px;
  border: 0.5px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: all var(--transition);
  margin-left: 6px;
}
.theme-toggle:hover {
  background: var(--bg-card);
  color: var(--text);
  border-color: var(--border-hover);
}

/* Mobile nav */
.nav-menu-btn {
  display: none;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-size: 18px;
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-menu-btn { display: flex; align-items: center; justify-content: center; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 0.5px solid var(--border);
    padding: 12px 24px;
    gap: 4px;
  }
  .nav-links.open .nav-link,
  .nav-links.open .nav-cta {
    display: block;
    width: 100%;
    text-align: left;
    padding: 10px 12px;
  }
}

/* ============================================
   HERO (landing only)
   ============================================ */
.hero {
  text-align: center;
  padding: 72px 24px 24px;
  max-width: 680px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--badge-text);
  background: var(--badge-bg);
  border: 0.5px solid rgba(21, 101, 192, 0.25);
  padding: 5px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}
.hero h1 {
  font-size: 44px;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin-bottom: 16px;
  color: var(--text);
}
.hero p {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 460px;
  margin: 0 auto 36px;
  line-height: 1.6;
}
.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
@media (max-width: 640px) {
  .hero { padding: 48px 20px 36px; }
  .hero h1 { font-size: 30px; }
  .hero p { font-size: 15px; }
  .hero-actions { flex-direction: column; align-items: center; }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: #fff;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-body);
  border: none;
  cursor: pointer;
  transition: background var(--transition);
  text-decoration: none;
}
.btn-primary:hover { background: var(--accent-hover); text-decoration: none; color: #fff; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  color: var(--text);
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-body);
  border: 0.5px solid var(--border-strong);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-secondary:hover {
  background: var(--bg-card);
  border-color: var(--border-hover);
  text-decoration: none;
}

/* ============================================
   LINK CARDS (landing quick links)
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
  padding: 16px 24px 40px;
}
.link-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 24px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text);
  transition: all var(--transition);
}
.link-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  text-decoration: none;
}
.link-card-title {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 2px;
}
.link-card-title i {
  color: var(--accent-light);
  font-size: 14px;
  margin-right: 2px;
}
.link-card-desc {
  font-size: 14px;
  color: var(--text-muted);
}
.link-card-arrow {
  color: var(--text-dim);
  font-size: 16px;
  transition: transform var(--transition);
}
.link-card:hover .link-card-arrow {
  transform: translateX(3px);
}
@media (max-width: 640px) {
  .card-grid { grid-template-columns: 1fr; padding: 24px 16px; }
}

/* ============================================
   PAGE CONTENT (podstranky)
   ============================================ */
.page-content {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 64px;
}
.page-content h1 {
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.page-content h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-top: 40px;
  margin-bottom: 12px;
  color: var(--text);
}
.page-content h3 {
  font-size: 17px;
  font-weight: 500;
  margin-top: 28px;
  margin-bottom: 8px;
  color: var(--text);
}
.page-content p {
  margin-bottom: 1em;
  color: var(--text-secondary);
  line-height: 1.7;
}
.page-content ul,
.page-content ol {
  margin-bottom: 1em;
  padding-left: 1.4em;
  color: var(--text-secondary);
}
.page-content li {
  margin-bottom: 0.35em;
  line-height: 1.65;
}
.page-content strong {
  color: var(--text);
  font-weight: 500;
}
.page-content em {
  color: var(--text-muted);
}
.page-content a {
  color: var(--accent-light);
}
.page-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 2px 6px;
  background: var(--code-bg);
  border-radius: 4px;
}
.page-content hr {
  border: none;
  border-top: 0.5px solid var(--border);
  margin: 32px 0;
}
.page-content blockquote {
  border-left: 2px solid var(--accent);
  padding: 8px 16px;
  margin: 1em 0;
  color: var(--text-muted);
  background: var(--accent-subtle);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.page-content img {
  border-radius: var(--radius-md);
  border: 0.5px solid var(--border);
  margin: 16px 0;
}
.page-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 32px;
}

/* Back link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.back-link:hover { color: var(--accent-light); text-decoration: none; }

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  padding: 24px 32px;
  max-width: 900px;
  margin: 48px auto 0;
  border-top: 0.5px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-dim);
}
.footer-links {
  display: flex;
  gap: 16px;
}
.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 12px;
}
.footer-links a:hover { color: var(--text-secondary); text-decoration: none; }
@media (max-width: 640px) {
  .site-footer { flex-direction: column; gap: 8px; text-align: center; }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Selection */
::selection {
  background: var(--accent);
  color: #fff;
}