/* ═══════════════════════════════════════════════════════
   SKINDOX Mongolia — motion.css
   4 premium motion effects: Split Text · Clip-path ·
   Blob Morphing · Magnetic Button
   Vanilla CSS only, no libraries.
═══════════════════════════════════════════════════════ */

/* ══════════════════════════════════════════════════════
   1. SPLIT TEXT REVEAL
   Each character flies up from below with rotation
══════════════════════════════════════════════════════ */

/* Per-character span */
.st-char {
  display: inline-block;
  opacity: 0;
  transform: translateY(22px) rotate(4deg);
  transition: opacity 0.55s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.55s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform, opacity;
  backface-visibility: hidden;
}

/* Per-word span (for section titles) */
.st-word {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.45em);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform, opacity;
}

/* Triggered state */
.st-ready.st-visible .st-char {
  opacity: 1;
  transform: translateY(0) rotate(0deg);
}
.st-word-ready.st-visible .st-word {
  opacity: 1;
  transform: translateY(0);
}

/* Hero title — larger, bolder animation */
.hero-title .st-char,
.hero-title strong .st-char {
  transform: translateY(28px) rotate(6deg);
  transition: opacity 0.60s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.60s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ══════════════════════════════════════════════════════
   2. CLIP-PATH SCROLL REVEAL
   Elements wipe upward into view from the bottom
══════════════════════════════════════════════════════ */

.clip-reveal {
  clip-path: inset(100% 0 0 0);
  transition: clip-path 0.90s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: clip-path;
}

.clip-reveal.clip-visible {
  clip-path: inset(0% 0 0 0);
}

/* Stagger children automatically */
.clip-reveal:nth-child(2) { transition-delay: 0.08s; }
.clip-reveal:nth-child(3) { transition-delay: 0.16s; }
.clip-reveal:nth-child(4) { transition-delay: 0.24s; }
.clip-reveal:nth-child(5) { transition-delay: 0.32s; }
.clip-reveal:nth-child(6) { transition-delay: 0.38s; }
.clip-reveal:nth-child(7) { transition-delay: 0.42s; }
.clip-reveal:nth-child(8) { transition-delay: 0.44s; }

/* Variant: slide from left (for lesson/notice cards) */
.clip-reveal-left {
  clip-path: inset(0 100% 0 0);
  transition: clip-path 0.80s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: clip-path;
}
.clip-reveal-left.clip-visible {
  clip-path: inset(0 0% 0 0);
}

/* ══════════════════════════════════════════════════════
   3. BLOB MORPHING BACKGROUND
   Organic liquid shapes in hero sections
══════════════════════════════════════════════════════ */

.blob-shape {
  position: absolute;
  border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
  filter: blur(48px);
  pointer-events: none;
  z-index: 0;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  will-change: border-radius, transform;
}

/* Blob A — primary teal, hero right */
@keyframes blobA {
  0%   { border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
         transform: scale(1)    rotate(0deg);   }
  25%  { border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%;
         transform: scale(1.08) rotate(5deg);   }
  60%  { border-radius: 50% 50% 20% 80% / 40% 70% 60% 50%;
         transform: scale(0.95) rotate(-3deg);  }
  100% { border-radius: 70% 30% 60% 40% / 60% 40% 70% 30%;
         transform: scale(1.06) rotate(8deg);   }
}

/* Blob B — gold accent, hero right */
@keyframes blobB {
  0%   { border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
         transform: scale(1)    rotate(0deg);   }
  40%  { border-radius: 70% 30% 40% 60% / 60% 40% 50% 60%;
         transform: scale(1.12) rotate(-8deg);  }
  100% { border-radius: 50% 50% 60% 40% / 30% 70% 40% 60%;
         transform: scale(0.91) rotate(5deg);   }
}

/* Blob C — subtle glow, hero left */
@keyframes blobC {
  0%   { transform: translateX(-50%) scale(1);    }
  50%  { transform: translateX(-48%) scale(1.18); }
  100% { transform: translateX(-52%) scale(0.88); }
}

/* Blob D — bonus/dark sections */
@keyframes blobD {
  0%   { border-radius: 55% 45% 65% 35% / 45% 55% 35% 65%;
         transform: scale(1)    rotate(0deg);   }
  100% { border-radius: 35% 65% 45% 55% / 65% 35% 55% 45%;
         transform: scale(1.14) rotate(-12deg); }
}

/* ══════════════════════════════════════════════════════
   4. MAGNETIC BUTTON
   Click ripple + will-change
══════════════════════════════════════════════════════ */

.magnetic {
  will-change: transform;
  position: relative;
  overflow: hidden; /* for ripple */
}

/* Click ripple animation */
@keyframes btnRipple {
  from {
    transform: scale(0);
    opacity: 0.6;
  }
  to {
    transform: scale(1);
    opacity: 0;
  }
}

.btn-ripple {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  background: rgba(255,255,255,0.30);
  animation: btnRipple 0.55s ease-out forwards;
  z-index: 20;
}

/* Shine streak on magnetic enter */
@keyframes magnetShine {
  from { transform: translateX(-100%) skewX(-20deg); opacity: 0.6; }
  to   { transform: translateX(200%)  skewX(-20deg); opacity: 0; }
}
.magnetic::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.22), transparent);
  transform: translateX(-100%) skewX(-20deg);
  pointer-events: none;
  border-radius: inherit;
}
.magnetic:hover::after {
  animation: magnetShine 0.65s ease-out forwards;
}

/* ══════════════════════════════════════════════════════
   NOISE TEXTURE OVERLAY (bonus atmosphere)
   Subtle film grain for Korean beauty aesthetic
══════════════════════════════════════════════════════ */

.hero::before,
.lesson-hero::before,
.bonus-section::before,
.video-section::before {
  /* Keep existing ::before but add noise via mix-blend */
}

/* Grain overlay — appended to hero via JS */
.grain-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
  opacity: 0.028;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
  mix-blend-mode: overlay;
  animation: grainShift 0.8s steps(2) infinite;
}

@keyframes grainShift {
  0%   { transform: translate(0, 0); }
  25%  { transform: translate(-2px, 1px); }
  50%  { transform: translate(1px, -2px); }
  75%  { transform: translate(2px, 1px); }
  100% { transform: translate(-1px, 2px); }
}

/* ══════════════════════════════════════════════════════
   RESPONSIVE — disable heavy effects on mobile
══════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  .blob-shape { filter: blur(32px); }
  .grain-overlay { opacity: 0.015; }
  /* Faster animations on mobile */
  .st-char  { transition-duration: 0.4s !important; }
  .st-word  { transition-duration: 0.45s !important; }
  .clip-reveal { transition-duration: 0.65s !important; }
}

@media (prefers-reduced-motion: reduce) {
  .st-char, .st-word,
  .clip-reveal, .clip-reveal-left,
  .blob-shape, .grain-overlay {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
    clip-path: none !important;
  }
}