* {
  user-select: none;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', sans-serif;
  background: var(--bg-main);
  color: var(--text-primary);
  overflow-y: auto;
}

#HSKContainer {
  display: flex;
  flex-direction: column;
  gap: 1.5vh;
  width: 100vw;
  box-sizing: border-box;
  padding: 2vh 4vw;
  margin-top: 8vh;
}

#HSKContainer::after {
  content: "";
  display: block;
  height: 4vh;
  width: 100%;
  flex-shrink: 0;
}

.hsk-card {

  border-radius: 2vw;
  color: #EAF2FA;
  box-shadow: 0 0.5vh 1.8vw rgba(0, 0, 0, 0.25);
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2vh 2vw;
  text-align: center;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}

.hsk-card.hidden {
  display: none;
}

.hsk-title {
  font-size: 7vw;
  font-weight: 700;
  transition: color 0.5s ease, text-shadow 0.6s ease;
}

.hsk-count {
  font-size: 4.2vw;
  color: var(--text-secondary);
  margin-bottom: 0.4vh;
  transition: color 0.5s ease, text-shadow 0.6s ease;
}

.hsk-desc {
  font-size: 4vw;
  color: var(--text-muted);
  transition: color 0.5s ease, text-shadow 0.6s ease;
}

.hsk-card:hover {
  transform: translateY(-1vh) scale(1.03);
  filter: brightness(1.1) saturate(1.15);
  box-shadow: 0 0 2.5vw rgba(13, 40, 56, 0.4)
}

.hsk-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    120deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.25) 50%,
    rgba(255, 255, 255, 0) 100%
  );
  transform: skewX(-20deg);
  transition: none;
}

.hsk-card:hover::after {
  animation: shine 1s ease forwards;
}

@keyframes shine {
  0% { left: -120%; opacity: 0; }
  30% { opacity: 0.8; }
  100% { left: 120%; opacity: 0; }
}

.hsk-card[data-level="A1"] { background: linear-gradient(135deg, #1E6F50, #145E3D); }
.hsk-card[data-level="A2"] { background: linear-gradient(135deg, #2E728D, #184D63); }
.hsk-card[data-level="B1"] { background: linear-gradient(135deg, #1C6781, #134E63); }
.hsk-card[data-level="B2"] { background: linear-gradient(135deg, #3E5A9A, #25356C); }
.hsk-card[data-level="C1"] { background: linear-gradient(135deg, #7A4BC3, #472B78); }
.hsk-card[data-level="C2"] { background: linear-gradient(135deg, #B05FA4, #6A3666); }
.hsk-card[data-level="HSK6+"] { background: linear-gradient(135deg, #A54F3E, #6D2C23); }
.hsk-card[data-level="OCEFR"] { background: linear-gradient(135deg, #823A3A, #3D1818); }

.hsk-card[data-level="A1"]:hover .hsk-title,
.hsk-card[data-level="A1"]:hover .hsk-count,
.hsk-card[data-level="A1"]:hover .hsk-desc {
  color: #C9F9D8;
  text-shadow: 0 0 1.5vw rgba(120, 255, 160, 0.6);
}

.hsk-card[data-level="A2"]:hover .hsk-title,
.hsk-card[data-level="A2"]:hover .hsk-count,
.hsk-card[data-level="A2"]:hover .hsk-desc {
  color: #C5F5FF;
  text-shadow: 0 0 1.5vw rgba(130, 240, 255, 0.6);
}

.hsk-card[data-level="B1"]:hover .hsk-title,
.hsk-card[data-level="B1"]:hover .hsk-count,
.hsk-card[data-level="B1"]:hover .hsk-desc {
  color: #D0F2FF;
  text-shadow: 0 0 1.5vw rgba(100, 210, 255, 0.6);
}

.hsk-card[data-level="B2"]:hover .hsk-title,
.hsk-card[data-level="B2"]:hover .hsk-count,
.hsk-card[data-level="B2"]:hover .hsk-desc {
  color: #D0E2FF;
  text-shadow: 0 0 1.5vw rgba(150, 200, 255, 0.6);
}

.hsk-card[data-level="C1"]:hover .hsk-title,
.hsk-card[data-level="C1"]:hover .hsk-count,
.hsk-card[data-level="C1"]:hover .hsk-desc {
  color: #E5CCFF;
  text-shadow: 0 0 1.5vw rgba(200, 150, 255, 0.6);
}

.hsk-card[data-level="C2"]:hover .hsk-title,
.hsk-card[data-level="C2"]:hover .hsk-count,
.hsk-card[data-level="C2"]:hover .hsk-desc {
  color: #FFD9F9;
  text-shadow: 0 0 1.5vw rgba(255, 160, 230, 0.6);
}

.hsk-card[data-level="HSK6+"]:hover .hsk-title,
.hsk-card[data-level="HSK6+"]:hover .hsk-count,
.hsk-card[data-level="HSK6+"]:hover .hsk-desc {
  color: #FFD6B0;
  text-shadow: 0 0 1.5vw rgba(255, 180, 100, 0.6);
}

.hsk-card[data-level="OCEFR"]:hover .hsk-title,
.hsk-card[data-level="OCEFR"]:hover .hsk-count,
.hsk-card[data-level="OCEFR"]:hover .hsk-desc {
  color: #FFDDD6;
  text-shadow: 0 0 1.5vw rgba(255, 140, 140, 0.6);
}

.hsk-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  display: none;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  font-size: 4vw;
  font-weight: bold;
  cursor: not-allowed;
  z-index: 10;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.hsk-card.locked:hover .hsk-overlay {
  display: flex;
  opacity: 1;
}

.hsk-card.locked {
  cursor: not-allowed;
}

@media (min-width: 768px) {
  body {
    overflow-y: hidden;
  }
  
  #HSKContainer {
    height: 100vh;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.7vh 2vw;
    padding: 2.5vh 2.5vw;
    margin-top: 10vh;
    overflow: hidden;
  }

  .hsk-card {
    border-radius: 1.8vw;
    box-shadow: 0 0.5vh 1.5vw rgba(0, 0, 0, 0.25);
    padding: 2vh 2.5vw;
  }

  .hsk-title {
    font-size: 3.5vw;
  }

  .hsk-count {
    font-size: 2.1vw;
    margin-bottom: 0.4vh;
  }

  .hsk-desc {
    font-size: 2vw;
  }

  .hsk-card:hover {
    transform: translateY(-1vh) scale(1.03);
    box-shadow: 0 0 1.7vw rgba(13, 40, 56, 0.4)
  }

  .hsk-overlay {
    font-size: 2.5vw;
  }
}

@media (min-width: 1024px), (orientation: landscape) {
  #HSKContainer {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 1fr);
    height: 80vh;
    gap: 2vh 1vw;
    margin-top: 20vh;
  }

  .hsk-card {
    border-radius: 1.6vw;
    box-shadow: 0 0.4vh 1.4vw rgba(0, 0, 0, 0.25);
    padding: 1.3vh 1.2vw;
  }

  .hsk-title {
    font-size: 3vw;
  }

  .hsk-count {
    font-size: 1.5vw;
    margin-bottom: 0.4vh;
  }

  .hsk-desc {
    font-size: 1.2vw;
  }

  .hsk-card:hover {
    transform: translateY(-0.8vh) scale(1.03);
    box-shadow: 0 0 1.4vw rgba(13, 40, 56, 0.4);
  }

  .hsk-overlay {
    font-size: 1.6vw;
  }
}

@media (orientation: landscape) and (hover: none) and (pointer: coarse) {
    html, body {
        overflow: auto;
    }
}