/* =====================================================================
   Intellika AI — shared site CSS
   Loaded on every page. Covers behaviors/styles that should be
   consistent everywhere:
     1. Button hover-glow (radial gradient follows cursor on .btn)
     2. Mobile navigation drawer (hamburger -> dropdown menu)
     3. Logo dark/light mode handling (auto-invert)
   Page-specific styles still live in each page's <style> block.
   ===================================================================== */

/* ============ 1. Button hover-glow ============
   Every .btn gets a radial gradient that follows the cursor.
   site.js updates --btn-glow-x / --btn-glow-y on mousemove.
   The page-specific CSS in each file may also define this — these
   selectors are scoped with attribute selectors to win specificity
   without breaking page-local overrides. */
.btn[class] {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}
.btn[class]::before {
  content: "";
  position: absolute;
  left: var(--btn-glow-x, 50%);
  top: var(--btn-glow-y, 50%);
  width: 240px;
  height: 240px;
  margin-left: -120px;
  margin-top: -120px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--btn-glow-color, rgba(135, 206, 255, 0.7)) 8%, transparent 65%);
  opacity: 0;
  pointer-events: none;
  transform: scale(0);
  transition: transform 420ms cubic-bezier(.2, .7, .2, 1), opacity 280ms ease;
  z-index: -1;
}
.btn[class]:hover::before {
  transform: scale(1);
  opacity: 0.55;
}
.btn[class].btn-primary { --btn-glow-color: rgba(160, 217, 248, 0.9); }
.btn[class].btn-ghost   { --btn-glow-color: rgba(20, 33, 61, 0.42); }
.btn[class].btn-on-dark { --btn-glow-color: rgba(255, 255, 255, 0.55); }

/* In dark mode tune the glow */
html[data-theme="dark"] .btn[class].btn-primary { --btn-glow-color: rgba(255, 255, 255, 0.32); }
html[data-theme="dark"] .btn[class].btn-ghost   { --btn-glow-color: rgba(255, 255, 255, 0.18); }

@media (prefers-reduced-motion: reduce) {
  .btn[class]::before { display: none !important; }
}

/* ============ 2. Mobile nav drawer ============
   Hamburger button + dropdown menu visible only below 940px.
   Pairs with HTML structure injected on every page. */
.nav-mobile-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  cursor: pointer;
  transition: background-color 180ms ease, border-color 180ms ease, transform 180ms ease;
}
.nav-mobile-toggle:hover { background: var(--surface); border-color: var(--line-strong); }
.nav-mobile-toggle:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
.nav-mobile-toggle:active { transform: scale(0.97); }
@media (min-width: 940px) {
  .nav-mobile-toggle { display: none; }
}

.nav-mobile-toggle .icon-burger,
.nav-mobile-toggle .icon-close {
  position: absolute;
  width: 18px;
  height: 18px;
  transition: transform 280ms cubic-bezier(.2, .7, .2, 1), opacity 220ms ease;
}
.nav-mobile-toggle .icon-burger { opacity: 1; transform: rotate(0deg) scale(1); }
.nav-mobile-toggle .icon-close  { opacity: 0; transform: rotate(-90deg) scale(0.85); }
.nav-mobile-toggle[aria-expanded="true"] .icon-burger { opacity: 0; transform: rotate(90deg) scale(0.85); }
.nav-mobile-toggle[aria-expanded="true"] .icon-close  { opacity: 1; transform: rotate(0deg) scale(1); }

/* Drawer panel */
.nav-mobile-panel {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 39;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--line);
  padding: 78px 22px 22px;
  transform: translateY(-100%);
  visibility: hidden;
  opacity: 0;
  transition: transform 340ms cubic-bezier(.2, .7, .2, 1), opacity 240ms ease, visibility 0s linear 340ms;
}
.nav-mobile-panel.is-open {
  transform: translateY(0);
  visibility: visible;
  opacity: 1;
  transition: transform 360ms cubic-bezier(.2, .7, .2, 1), opacity 220ms ease, visibility 0s linear 0s;
}
@media (min-width: 940px) {
  .nav-mobile-panel { display: none; }
}

.nav-mobile-panel nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 720px;
  margin: 0 auto;
}
.nav-mobile-panel a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  font-size: 16.5px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.012em;
  border-radius: 14px;
  background: color-mix(in srgb, var(--surface) 60%, transparent);
  border: 1px solid var(--line);
  transition: background-color 180ms ease, border-color 180ms ease, transform 180ms ease;
}
.nav-mobile-panel a:hover,
.nav-mobile-panel a:focus-visible {
  background: var(--surface);
  border-color: var(--line-strong);
  transform: translateX(2px);
}
.nav-mobile-panel a::after {
  content: "→";
  font-size: 16px;
  color: var(--muted);
  transition: transform 220ms ease, color 180ms ease;
}
.nav-mobile-panel a:hover::after { transform: translateX(4px); color: var(--ink); }

.nav-mobile-panel .mobile-cta {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 20px;
  background: var(--accent);
  color: var(--accent-text);
  border: none;
  font-weight: 600;
  border-radius: 14px;
  box-shadow: 0 12px 28px -12px rgba(20, 33, 61, 0.32);
}
.nav-mobile-panel .mobile-cta::after { color: var(--accent-text); }
.nav-mobile-panel .mobile-cta:hover { background: var(--accent-hover); }

/* Stagger entrance once panel opens */
.nav-mobile-panel a,
.nav-mobile-panel .mobile-cta {
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 320ms ease, transform 320ms cubic-bezier(.2, .7, .2, 1),
              background-color 180ms ease, border-color 180ms ease;
}
.nav-mobile-panel.is-open a,
.nav-mobile-panel.is-open .mobile-cta {
  opacity: 1;
  transform: translateY(0);
}
.nav-mobile-panel.is-open a:nth-child(1) { transition-delay: 60ms; }
.nav-mobile-panel.is-open a:nth-child(2) { transition-delay: 110ms; }
.nav-mobile-panel.is-open a:nth-child(3) { transition-delay: 160ms; }
.nav-mobile-panel.is-open a:nth-child(4) { transition-delay: 210ms; }
.nav-mobile-panel.is-open a:nth-child(5) { transition-delay: 260ms; }
.nav-mobile-panel.is-open a:nth-child(6) { transition-delay: 310ms; }
.nav-mobile-panel.is-open .mobile-cta    { transition-delay: 360ms; }

/* Body scroll-lock when drawer is open */
body.nav-locked { overflow: hidden; }

@media (prefers-reduced-motion: reduce) {
  .nav-mobile-panel,
  .nav-mobile-panel a,
  .nav-mobile-panel .mobile-cta { transition: opacity 120ms ease, visibility 0s; transform: none !important; }
}

/* ============ 3. Logo auto-invert in dark mode ============
   For brand images that are dark navy on transparent background,
   automatically invert to white when in dark mode.
   Add class="logo-auto" to such <img> tags. */
.logo-auto {
  transition: filter 200ms ease;
}
html[data-theme="dark"] .logo-auto {
  filter: brightness(0) saturate(100%) invert(100%);
}