:root {
  --glass-blur: 24px;
  --glass-saturate: 1.4;
  --glass-bg: rgba(255,255,255,.04);
  --glass-border: rgba(255,255,255,.08);
  --glass-border-hover: rgba(255,255,255,.18);
  --glass-radius: 28px;
  --glass-radius-sm: 20px;
  --glass-shadow: inset 0 1px 0 rgba(255,255,255,.08), 0 8px 32px rgba(0,0,0,.3);
  --glass-shadow-hover: 0 16px 48px rgba(0,0,0,.5);
  --glass-shine-opacity: .03;
  --glass-shine-speed: 10s;
  --glass-btn-bg: rgba(255,255,255,.12);
  --glass-btn-border: rgba(255,255,255,.15);
  --glass-btn-hover: rgba(255,255,255,.2);
  --glass-text: #f5f5f7;
  --glass-text-secondary: rgba(255,255,255,.55);
  --glass-accent: #7cf2d0;
  --glass-accent-glow: 0 0 30px rgba(124,242,208,.15);
}

[data-glass="neon"] {
  --glass-bg: rgba(0,20,40,.15);
  --glass-border: rgba(0,212,255,.15);
  --glass-border-hover: rgba(0,212,255,.3);
  --glass-btn-bg: rgba(0,212,255,.1);
  --glass-btn-border: rgba(0,212,255,.2);
  --glass-btn-hover: rgba(0,212,255,.18);
  --glass-accent: #00d4ff;
  --glass-shine-opacity: .05;
  --glass-accent-glow: 0 0 30px rgba(0,212,255,.15);
}

[data-glass="purple"] {
  --glass-bg: rgba(40,0,60,.15);
  --glass-border: rgba(180,0,255,.15);
  --glass-border-hover: rgba(180,0,255,.3);
  --glass-btn-bg: rgba(180,0,255,.1);
  --glass-btn-border: rgba(180,0,255,.2);
  --glass-btn-hover: rgba(180,0,255,.18);
  --glass-accent: #b400ff;
  --glass-accent-glow: 0 0 30px rgba(180,0,255,.15);
}

[data-glass="amber"] {
  --glass-bg: rgba(60,30,0,.12);
  --glass-border: rgba(255,180,0,.15);
  --glass-border-hover: rgba(255,180,0,.3);
  --glass-btn-bg: rgba(255,180,0,.1);
  --glass-btn-border: rgba(255,180,0,.2);
  --glass-btn-hover: rgba(255,180,0,.18);
  --glass-accent: #ffb400;
  --glass-accent-glow: 0 0 30px rgba(255,180,0,.15);
}

[data-glass="emerald"] {
  --glass-bg: rgba(0,40,20,.15);
  --glass-border: rgba(0,255,136,.15);
  --glass-border-hover: rgba(0,255,136,.3);
  --glass-btn-bg: rgba(0,255,136,.1);
  --glass-btn-border: rgba(0,255,136,.2);
  --glass-btn-hover: rgba(0,255,136,.18);
  --glass-accent: #00ff88;
  --glass-accent-glow: 0 0 30px rgba(0,255,136,.15);
}

/* ===== GLASS CARD (large) ===== */
.glass {
  position: relative;
  overflow: hidden;
  border-radius: var(--glass-radius);
  padding: 52px 48px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  transition: transform .4s cubic-bezier(.25,.46,.45,.94), box-shadow .4s ease, border-color .4s ease;
}

.glass:hover {
  transform: translateY(-2px);
  border-color: var(--glass-border-hover);
  box-shadow: var(--glass-shadow-hover), var(--glass-accent-glow);
}

.glass::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(ellipse 80% 60% at 30% 10%, rgba(255,255,255,.08) 0%, transparent 70%),
    linear-gradient(135deg, transparent 40%, rgba(255,255,255,.02) 50%, transparent 60%);
  pointer-events: none;
}

/* ===== GLASS WARP (backdrop + SVG displacement) ===== */
.glass__warp {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  border-radius: inherit;
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  background: rgba(0, 0, 0, 0.25);
}

/* Ensure glass-card-sm content renders above the warp */
.glass-card-sm > *:not(.glass__warp) {
  position: relative;
  z-index: 2;
}

/* ===== EDGE GLOW (border refraction) ===== */
.glass-edge-glow {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  border-radius: inherit;
  padding: 1.5px;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  box-shadow: inset 0 0 0 0.5px rgba(255,255,255,.12);
  background: linear-gradient(135deg, transparent, rgba(255,255,255,.08) 33%, rgba(255,255,255,.2) 66%, transparent);
  opacity: .3;
  transition: opacity .4s ease;
}

.glass:hover .glass-edge-glow {
  opacity: .6;
}

/* ===== SHINE ANIMATION ===== */
.glass-shine {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  z-index: 1;
  background: conic-gradient(from 0deg at 50% 50%, transparent 0%, rgba(255,255,255,var(--glass-shine-opacity)) 25%, transparent 50%);
  animation: glassRotate var(--glass-shine-speed) linear infinite;
  pointer-events: none;
}

@keyframes glassRotate { to { transform: rotate(360deg); } }

.glass-content {
  position: relative;
  z-index: 2;
}

.glass-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--glass-text);
  letter-spacing: -.03em;
  margin: 0 0 12px;
}

.glass-desc {
  font-size: 16px;
  line-height: 1.6;
  color: var(--glass-text-secondary);
}

/* ===== GLASS BUTTON ===== */
.glass-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: 40px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all .3s cubic-bezier(.25,.46,.45,.94);
  letter-spacing: -.01em;
  user-select: none;
  background: var(--glass-btn-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-btn-border);
  color: var(--glass-text);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.2);
}

.glass-btn:hover {
  background: var(--glass-btn-hover);
  transform: scale(1.04);
  border-color: var(--glass-accent);
}

.glass-btn:active { transform: scale(.96); }

.glass-btn-accent {
  background: var(--glass-accent);
  color: #000;
  border-color: var(--glass-accent);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.3), var(--glass-accent-glow);
}

.glass-btn-accent:hover {
  filter: brightness(1.15);
  box-shadow: 0 0 40px var(--glass-accent);
}

/* ===== GLASS CARD (small) ===== */
.glass-card-sm {
  position: relative;
  overflow: hidden;
  border-radius: var(--glass-radius-sm);
  padding: 28px 24px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.06), 0 4px 20px rgba(0,0,0,.15);
  transition: transform .35s ease, box-shadow .35s ease, border-color .35s ease;
}

.glass-card-sm:hover {
  transform: translateY(-6px);
  border-color: var(--glass-border-hover);
  box-shadow: 0 12px 40px rgba(0,0,0,.35), var(--glass-accent-glow);
}

.glass-card-sm::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  z-index: 1;
  background: linear-gradient(90deg, transparent, var(--glass-border), transparent);
}

/* Subtle reflection sweep on hover */
.glass-card-sm::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: inherit;
  background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,.04) 50%, transparent 60%);
  opacity: 0;
  transition: opacity .5s ease;
  pointer-events: none;
}

.glass-card-sm:hover::after {
  opacity: 1;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .glass { padding: 36px 28px; border-radius: 22px; }
  .glass-title { font-size: 26px; }
  .glass-desc { font-size: 15px; }
  .glass-btn { padding: 12px 26px; font-size: 14px; }
  .glass-card-sm { padding: 24px 20px; }
}

@media (max-width: 450px) {
  .glass { padding: 28px 20px; border-radius: 18px; }
  .glass-title { font-size: 22px; }
}