/* ============================================================
   glass.css
   Glassmorphic card recipe for the ARIA paper site.
   Standalone stylesheet — no @imports. Drop the :root block
   below into design-tokens.css if these vars are not yet
   defined globally.

   Usage: <article class="glass-card"> ... </article>
   Add .glass-card--compact, .glass-card--tier-1/2/3 as needed.

   Effects:
   - Subtle floating drift on idle (--float-duration adjustable)
   - Cursor-following spotlight glow (auto-disabled on touch + reduced-motion)
   - Soft hover lift (no 3D rotation — the 3D tilt was too much for an
     academic paper aesthetic; replaced with a refined translateY)
   ============================================================ */

/* ---------- Design tokens (mirror of design-tokens.css) ----------
:root {
  --ink: #141e2d;
  --graphite: #4a5568;
  --mint: #68ACE5;
  --mint-bright: #8fc1ea;
  --mint-glow: rgba(104, 172, 229, 0.20);
  --pearl-glass: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.6);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.06);
  --shadow-glass-hover: 0 20px 48px rgba(0, 0, 0, 0.10);
  --tier-1: #002D72;
  --tier-2: #A99400;
  --tier-3: #6c7a92;
  --ease-spring: cubic-bezier(.34, 1.56, .64, 1);
}
------------------------------------------------------------------- */

/* ---------- Float keyframe (shared) ----------
   A slow vertical drift — ±2px over 6s — so idle cards feel alive
   without the visual noise of 3D rotation. Each card has a unique
   --float-delay set in glass-card.js so they don't move in lockstep. */
@keyframes glass-float {
  0%   { transform: translateY(0); }
  50%  { transform: translateY(-3px); }
  100% { transform: translateY(0); }
}

@keyframes glass-float-slow {
  0%   { transform: translateY(0); }
  50%  { transform: translateY(-2px); }
  100% { transform: translateY(0); }
}

/* ---------- Glass card ---------- */

.glass-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--pearl-glass, rgba(255, 255, 255, 0.55));
  border: 1px solid var(--glass-border, rgba(255, 255, 255, 0.6));
  border-radius: 24px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6), var(--shadow-glass, 0 8px 32px rgba(0, 0, 0, 0.06));
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  transform: translateY(0);
  transform-style: flat;
  transition:
    transform 280ms cubic-bezier(.16, 1, .3, 1),
    box-shadow 280ms ease,
    border-color 280ms ease;
  will-change: transform;
  overflow: hidden;
  animation: glass-float 6.5s ease-in-out infinite;
  animation-delay: var(--float-delay, 0s);
}

/* Soft idle lift + slight inner glow on hover. NO 3D rotation —
   the prior rotateX/rotateY was too theatrical for the paper
   aesthetic and the JHU Morandi palette reads better with
   refined micro-motion. */
.glass-card:hover,
.glass-card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(104, 172, 229, 0.35);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.75),
    0 20px 48px rgba(0, 45, 114, 0.12),
    0 0 0 1px rgba(104, 172, 229, 0.08);
}

/* Pause the float while hovering — the explicit lift takes over */
.glass-card:hover,
.glass-card:focus-within {
  animation-play-state: paused;
}

.glass-card:focus-within {
  outline: 2px solid var(--spirit-blue, #68ACE5);
  outline-offset: 2px;
}

/* Cursor-following spotlight — driven by --mx / --my from glass-card.js.
   Now subtle: a smaller, more refined Spirit-Blue wash that doesn't
   compete with the chart/data inside the card. */

.glass-card::before {
  content: "";
  position: absolute;
  inset: -10%;
  border-radius: inherit;
  background: radial-gradient(
    260px circle at var(--mx, 50%) var(--my, 50%),
    rgba(104, 172, 229, 0.14),
    transparent 55%
  );
  opacity: 0;
  transition: opacity 320ms ease;
  pointer-events: none;
  z-index: 0;
}

.glass-card:hover::before,
.glass-card:focus-within::before { opacity: 1; }

/* Card children sit above the spotlight glow */

.glass-card > * { position: relative; z-index: 1; }

/* ---------- Variants ---------- */

.glass-card--compact {
  padding: 18px;
  border-radius: 20px;
  animation-name: glass-float-slow;
  animation-duration: 7.5s;
}


/* ---------- No-tilt / no-spotlight / no-float modifiers ----------
   Apply to containers whose contents need to stay perfectly still:
   - chart canvases (tilt + spotlight on a chart makes it hard to read)
   - the main results table (data integrity > micro-delight)
   - any block where the user is meant to focus on the data */

.glass-card--no-tilt:hover,
.glass-card--no-tilt:focus-within {
  transform: translateY(-1px);
}

.glass-card--no-spotlight::before,
.glass-card--no-spotlight:hover::before,
.glass-card--no-spotlight:focus-within::before {
  display: none;
}

.glass-card--no-float {
  animation: none !important;
}

/* Glass card that lets its children's hover popovers escape the
   rounded overflow:hidden mask. Used for callouts containing
   .term-tip / glossary popovers that need to overflow upward. */
.glass-card--bleed {
  overflow: visible;
}

/* ---------- Reduced motion (CSS-side fallback) ---------- */

@media (prefers-reduced-motion: reduce) {
  .glass-card,
  .glass-card:hover,
  .glass-card:focus-within {
    transition: none;
    transform: none;
    animation: none;
  }
  .glass-card::before,
  .glass-card:hover::before,
  .glass-card:focus-within::before {
    transition: none;
  }
}

body.no-motion .glass-card,
body.no-motion .glass-card:hover,
body.no-motion .glass-card:focus-within {
  transform: none;
  animation: none;
  transition: none;
}

body.no-motion .glass-card::before { opacity: 0; }

/* ---------- Browser fallback for missing backdrop-filter ---------- */

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass-card { background: rgba(255, 255, 255, 0.92); }
}

/* JS-driven spotlight kill-switch (set on <body> by glass-card.js) */

body.no-spotlight .glass-card::before { opacity: 0 !important; }