/**
 * ╔═══════════════════════════════════════════════════════════════════════════╗
 * ║                         ✨ KOLO NEON UTILITIES                           ║
 * ║            Opt-in neon/glass/gradient utility classes for UI              ║
 * ╚═══════════════════════════════════════════════════════════════════════════╝
 *
 * Additive utilities (doesn't replace existing .btn/.card/... styles).
 * Dark theme keeps orange accents; light theme is blue accents (via variables).
 */

/* ─────────────────────────────────────────────────────────────────────────
   Cards
   ───────────────────────────────────────────────────────────────────────── */
.k-card {
  background: var(--k-glass-bg);
  backdrop-filter: blur(var(--k-glass-blur));
  -webkit-backdrop-filter: blur(var(--k-glass-blur));
  border: 1px solid var(--k-border-default);
  border-radius: var(--k-radius-xl);
  padding: var(--k-space-6);
  box-shadow: var(--k-shadow-md);
  transition: all var(--k-duration-normal) var(--k-ease-default);
}

.k-card:hover {
  border-color: var(--k-border-strong);
  box-shadow: var(--k-shadow-lg);
  transform: translateY(-2px);
}

.k-card-glow {
  position: relative;
  overflow: hidden;
}

.k-card-glow::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--k-gradient-primary);
  opacity: 0;
  transition: opacity var(--k-duration-normal);
  z-index: -1;
}

.k-card-glow:hover::before {
  opacity: 0.1;
}

.k-card-glow-strong {
  box-shadow:
    var(--k-shadow-lg),
    0 0 30px var(--k-primary-glow),
    inset 0 0 20px rgba(255, 107, 53, 0.1);
}

[data-theme="light"] .k-card-glow-strong {
  box-shadow:
    var(--k-shadow-lg),
    0 0 30px var(--k-primary-glow),
    inset 0 0 20px rgba(37, 99, 235, 0.1);
}

.k-card-glow-strong:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow:
    var(--k-shadow-2xl),
    0 0 50px var(--k-primary-glow),
    inset 0 0 30px var(--k-primary-soft);
}

/* ─────────────────────────────────────────────────────────────────────────
   Buttons
   ───────────────────────────────────────────────────────────────────────── */
.k-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--k-space-2);
  padding: var(--k-space-3) var(--k-space-6);
  font-weight: var(--k-weight-semibold);
  border-radius: var(--k-radius-lg);
  transition: all var(--k-duration-fast) var(--k-ease-default);
  cursor: pointer;
  border: none;
  outline: none;
  white-space: nowrap;
  user-select: none;
}

.k-btn-primary {
  background: var(--k-gradient-primary);
  color: #fff;
  box-shadow: var(--k-shadow-sm);
}

.k-btn-primary:hover {
  box-shadow: var(--k-shadow-glow-sm);
  transform: translateY(-2px);
}

.k-btn-primary:active {
  transform: translateY(0);
}

.k-btn-secondary {
  background: var(--k-bg-elevated);
  color: var(--k-text-primary);
  border: 1px solid var(--k-border-default);
}

.k-btn-secondary:hover {
  background: var(--k-bg-hover);
  border-color: var(--k-border-strong);
}

.k-btn-ghost {
  background: transparent;
  color: var(--k-text-primary);
  border: 1px solid transparent;
}

.k-btn-ghost:hover {
  background: var(--k-bg-hover);
  border-color: var(--k-border-default);
}

/* Neon button */
.k-btn-neon {
  position: relative;
  background: transparent;
  color: var(--k-primary);
  border: 2px solid var(--k-primary);
  overflow: hidden;
  transition: all var(--k-duration-normal);
}

.k-btn-neon::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--k-primary);
  opacity: 0;
  transition: opacity var(--k-duration-normal);
}

.k-btn-neon:hover::before {
  opacity: 0.2;
}

.k-btn-neon:hover {
  box-shadow:
    0 0 20px var(--k-primary-glow),
    0 0 40px var(--k-primary-glow),
    inset 0 0 20px var(--k-primary-glow);
  transform: translateY(-2px);
}

.k-btn-neon span,
.k-btn-neon svg {
  position: relative;
  z-index: 1;
}

/* ─────────────────────────────────────────────────────────────────────────
   Inputs
   ───────────────────────────────────────────────────────────────────────── */
.k-input {
  width: 100%;
  padding: var(--k-space-3) var(--k-space-4);
  background: var(--k-bg-elevated);
  border: 1px solid var(--k-border-default);
  border-radius: var(--k-radius-lg);
  color: var(--k-text-primary);
  font-size: var(--k-text-base);
  transition: all var(--k-duration-fast) var(--k-ease-default);
}

.k-input:focus {
  outline: none;
  border-color: var(--k-primary);
  box-shadow: 0 0 0 3px var(--k-primary-soft);
}

.k-input::placeholder {
  color: var(--k-text-muted);
}

/* ─────────────────────────────────────────────────────────────────────────
   Badges
   ───────────────────────────────────────────────────────────────────────── */
.k-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--k-space-1) var(--k-space-3);
  font-size: var(--k-text-sm);
  font-weight: var(--k-weight-medium);
  border-radius: var(--k-radius-full);
  background: var(--k-bg-elevated);
  color: var(--k-text-primary);
  border: 1px solid var(--k-border-default);
}

.k-badge-primary {
  background: var(--k-primary-soft);
  color: var(--k-primary);
  border-color: var(--k-primary);
}

.k-badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--k-green);
  border-color: var(--k-green);
}

.k-badge-danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--k-red);
  border-color: var(--k-red);
}

.k-badge-neon {
  background: transparent;
  color: var(--k-primary);
  border: 2px solid var(--k-primary);
  box-shadow:
    0 0 10px var(--k-primary-glow),
    inset 0 0 10px var(--k-primary-glow);
  font-weight: var(--k-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ─────────────────────────────────────────────────────────────────────────
   Neon texts / borders
   ───────────────────────────────────────────────────────────────────────── */
.neon-text {
  color: var(--k-primary);
  text-shadow:
    0 0 10px var(--k-primary-glow),
    0 0 20px var(--k-primary-glow),
    0 0 30px var(--k-primary-glow);
  animation: kpNeonPulse 2s ease-in-out infinite;
}

.neon-text-secondary {
  color: var(--k-secondary);
  text-shadow:
    0 0 10px var(--k-secondary-glow),
    0 0 20px var(--k-secondary-glow),
    0 0 30px var(--k-secondary-glow);
  animation: kpNeonPulse 2s ease-in-out infinite;
}

.neon-border {
  border: 2px solid var(--k-primary);
  box-shadow:
    0 0 10px var(--k-primary-glow),
    0 0 20px var(--k-primary-glow),
    inset 0 0 10px var(--k-primary-glow);
  animation: kpNeonBorderPulse 2s ease-in-out infinite;
}

.neon-border-secondary {
  border: 2px solid var(--k-secondary);
  box-shadow:
    0 0 10px var(--k-secondary-glow),
    0 0 20px var(--k-secondary-glow),
    inset 0 0 10px var(--k-secondary-glow);
  animation: kpNeonBorderPulse 2s ease-in-out infinite;
}

/* ─────────────────────────────────────────────────────────────────────────
   Gradient borders
   ───────────────────────────────────────────────────────────────────────── */
.gradient-border {
  position: relative;
  background: var(--k-bg-card);
  border-radius: var(--k-radius-xl);
  padding: var(--k-space-6);
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--k-radius-xl);
  padding: 2px;
  background: var(--k-gradient-primary);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}

.gradient-border-rainbow::before {
  background: var(--k-gradient-rainbow);
  animation: kpGradientRotate 3s linear infinite;
}

/* ─────────────────────────────────────────────────────────────────────────
   Animated gradients / glass
   ───────────────────────────────────────────────────────────────────────── */
.animated-gradient {
  background: linear-gradient(45deg, var(--k-primary), var(--k-secondary), var(--k-cyan), var(--k-primary));
  background-size: 300% 300%;
  animation: kpGradientFlow 6s ease infinite;
}

.glass-strong {
  background: var(--k-glass-bg-strong);
  backdrop-filter: blur(var(--k-glass-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--k-glass-blur)) saturate(180%);
  border: 1px solid var(--k-glass-border);
  box-shadow:
    var(--k-shadow-xl),
    0 8px 32px 0 rgba(37, 99, 235, 0.1);
}

[data-theme="light"] .glass-strong {
  box-shadow:
    var(--k-shadow-xl),
    0 8px 32px 0 rgba(37, 99, 235, 0.15);
}

.floating {
  animation: kpFloating 3s ease-in-out infinite;
}

/* ─────────────────────────────────────────────────────────────────────────
   Optional scanline (dark theme)
   ───────────────────────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: no-preference) {
  html:not([data-theme="light"]) body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: linear-gradient(to bottom, transparent 0%, rgba(255, 107, 53, 0.03) 50%, transparent 100%);
    height: 2px;
    animation: kpScanLine 8s linear infinite;
    pointer-events: none;
    z-index: 9999;
  }
}

/* ─────────────────────────────────────────────────────────────────────────
   Keyframes
   ───────────────────────────────────────────────────────────────────────── */
@keyframes kpNeonPulse {
  0%, 100% {
    text-shadow:
      0 0 10px var(--k-primary-glow),
      0 0 20px var(--k-primary-glow),
      0 0 30px var(--k-primary-glow);
  }
  50% {
    text-shadow:
      0 0 15px var(--k-primary-glow),
      0 0 30px var(--k-primary-glow),
      0 0 45px var(--k-primary-glow);
  }
}

@keyframes kpNeonBorderPulse {
  0%, 100% {
    box-shadow:
      0 0 10px var(--k-primary-glow),
      0 0 20px var(--k-primary-glow),
      inset 0 0 10px var(--k-primary-glow);
  }
  50% {
    box-shadow:
      0 0 15px var(--k-primary-glow),
      0 0 30px var(--k-primary-glow),
      inset 0 0 15px var(--k-primary-glow);
  }
}

@keyframes kpGradientRotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes kpGradientFlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes kpFloating {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes kpScanLine {
  0% { transform: translateY(-100vh); }
  100% { transform: translateY(100vh); }
}