/* Site chrome styles */

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.3s var(--ease-out), border-color 0.3s;
  border-bottom: 1px solid transparent;
}
.nav-scrolled {
  background: color-mix(in oklab, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom-color: var(--border);
}
.nav-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 16px 32px;
  display: flex;
  align-items: center;
  gap: 40px;
}
.nav-logo {
  display: inline-flex; align-items: center; gap: 10px;
  letter-spacing: -0.02em;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  flex-shrink: 0;
}
.nav-logo-text { white-space: nowrap; }

/* Mark SVG uses its own gradient which reads on both themes — no filter needed. */

.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
  margin-right: auto;
}
.nav-link {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-muted);
  transition: color 0.2s, background 0.2s;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.nav-link:hover { color: var(--text); background: var(--surface); }
.nav-link-active { color: var(--text); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.theme-toggle {
  width: 44px; height: 44px;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  display: inline-flex; align-items: center; justify-content: center;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.theme-toggle:hover { color: var(--text); border-color: var(--border-strong); background: var(--surface); }

.nav-mobile-btn { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; }
.hamburger { position: relative; width: 18px; height: 12px; }
.hamburger span { position: absolute; left: 0; right: 0; height: 1.5px; background: currentColor; transition: transform 0.3s, top 0.3s; }
.hamburger span:nth-child(1) { top: 2px; }
.hamburger span:nth-child(2) { top: 9px; }
.hamburger.open span:nth-child(1) { top: 5px; transform: rotate(45deg); }
.hamburger.open span:nth-child(2) { top: 5px; transform: rotate(-45deg); }

.nav-mobile-menu {
  display: flex;
  flex-direction: column;
  padding: 16px 24px 24px;
  gap: 4px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
}
.nav-mobile-link { padding: 12px 8px; border-bottom: 1px solid var(--border); color: var(--text); }

@media (max-width: 1024px) {
  .nav-links { display: none; }
  .nav-mobile-btn { display: inline-flex; }
  .nav-cta { display: none; }
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 80px 0 40px;
  background: var(--bg-inset);
  margin-top: 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 64px;
  border-bottom: 1px solid var(--border);
}
.footer-brand { max-width: 380px; }
.footer-tagline { color: var(--text-muted); font-size: 14px; margin-bottom: 24px; line-height: 1.6; }
.footer-contact { display: flex; flex-direction: column; gap: 8px; font-size: 14px; }
.footer-contact-line { color: var(--text-muted); display: flex; align-items: baseline; gap: 12px; }
.footer-contact-line .label-mono { min-width: 40px; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col-title { margin-bottom: 8px; }
.footer-col a { color: var(--text-muted); font-size: 14px; transition: color 0.2s; }
.footer-col a:hover { color: var(--text); }

.footer-base {
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 16px;
}
.footer-base-left { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.footer-base-left a { color: var(--text-muted); }
.footer-base-left a:hover { color: var(--text); }
.footer-dot { opacity: 0.4; }
.footer-base-right { font-size: 12px; display: inline-flex; align-items: center; }

/* Social links with brand icons */
.footer-social {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--text-muted);
  transition: color 0.2s;
}
.footer-social:hover { color: var(--text); }
.footer-social svg { flex: none; opacity: 0.75; transition: opacity 0.2s; }
.footer-social:hover svg { opacity: 1; }
.footer-social-arrow {
  margin-left: auto;
  font-size: 11px;
  opacity: 0.5;
  transition: transform 0.2s, opacity 0.2s;
}
.footer-social:hover .footer-social-arrow { opacity: 1; transform: translate(2px, -2px); }

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; max-width: none; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ---------- Tweaks panel ---------- */
.tweaks-panel {
  position: fixed;
  bottom: 24px; right: 24px;
  width: 300px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  padding: 18px;
  z-index: 200;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
  font-size: 13px;
  backdrop-filter: blur(16px);
}
.tweaks-panel h4 { font-size: 12px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-muted); font-weight: 500; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.tweaks-panel h4::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.tweak-row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.tweak-row-label { font-size: 11px; font-family: var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-dim); }
.tweak-options { display: flex; gap: 4px; flex-wrap: wrap; }
.tweak-opt {
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 12px;
  transition: all 0.2s;
}
.tweak-opt:hover { border-color: var(--border-strong); color: var(--text); }
.tweak-opt.active { background: var(--text); color: var(--bg); border-color: var(--text); }


/* Accessibility: keyboard skip-to-main-content link */
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 1000;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border-strong);
  padding: 12px 18px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 16px;
  outline: 2px solid var(--accent, #86CEE3);
  outline-offset: 2px;
}