.classes-container {
    min-height: 100vh;
    width: 100%;
    padding: 6rem 0 4rem;
    max-width: none;
    margin: 0;
    border: none;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, 
        rgba(var(--primary-rgb), 0.04) 0%,
        rgba(var(--accent-rgb), 0.04) 100%);
}

.classes-container::before,
.classes-container::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    z-index: 0;
    filter: blur(80px);
    opacity: 0.15;
    pointer-events: none;
}

.classes-container::before {
    background: var(--primary-color);
    top: -100px;
    right: -100px;
    animation: float 8s ease-in-out infinite;
}

.classes-container::after {
    background: var(--accent-color);
    bottom: -100px;
    left: -100px;
    animation: float 8s ease-in-out infinite reverse;
}

.subject-header {
    text-align: center;
    margin-bottom: 4rem;
    animation: fadeIn 0.6s ease-out forwards;
}

.text-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.grade-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(200px, 280px));
    gap: 1.5rem;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem;
    justify-content: center;
    animation: fadeIn 0.8s ease-out forwards;
}

.grade-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    text-decoration: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08),
                0 1px 3px rgba(0, 0, 0, 0.06);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    overflow: hidden;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    will-change: transform, box-shadow;
    isolation: isolate;
}

.grade-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 20px;
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.grade-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), 
        rgba(var(--primary-rgb), 0.12) 0%,
        rgba(var(--accent-rgb), 0.08) 30%,
        transparent 70%
    );
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
    mix-blend-mode: multiply;
}

.grade-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 24px 48px rgba(var(--primary-rgb), 0.15),
                0 12px 24px rgba(0, 0, 0, 0.1),
                0 0 0 2px var(--primary-color),
                0 0 80px rgba(var(--accent-rgb), 0.08);
}

.grade-card:active {
    transform: translateY(-8px) scale(1.01);
    box-shadow: 0 12px 24px rgba(var(--primary-rgb), 0.15);
    transition: all 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

.grade-card:hover::after {
    opacity: 1;
}

.grade-card .shine {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 30%,
        rgba(255, 255, 255, 0.4) 50%,
        transparent 70%
    );
    transform: translateX(-100%) translateY(-100%) rotate(45deg);
    transition: transform 0.6s ease;
    pointer-events: none;
    mix-blend-mode: overlay;
}

.grade-card:hover .shine {
    transform: translateX(100%) translateY(100%) rotate(45deg);
}

.grade-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
    position: relative;
    z-index: 1;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.grade-card:hover .grade-content {
    transform: translateY(0);
}

.grade-number {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1;
    background: linear-gradient(135deg, 
        var(--primary-color) 0%,
        var(--accent-color) 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 0.5rem;
    transition: all var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
}

.grade-card:hover .grade-number {
    transform: scale(1.1);
    background: linear-gradient(135deg, 
        var(--accent-color) 0%,
        var(--primary-color) 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
}

.grade-content h2 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin: 0;
    font-weight: 500;
    opacity: 0.9;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(20px);
    }
}

@media (max-width: 1024px) {
    .grade-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 600px;
    }
}

@media (max-width: 640px) {
    .classes-container {
        padding: 5rem 1.5rem 3rem;
    }

    .grade-grid {
        grid-template-columns: 1fr;
        max-width: 300px;
        gap: 1.5rem;
    }

    .grade-card {
        padding: 2rem;
    }

    .grade-number {
        font-size: 3.5rem;
    }
}
.grade-card.special {
  background: linear-gradient(135deg, #6a5acd, #8a2be2);
  color: white;
  box-shadow: 0 0 15px rgba(138,43,226,0.4);
}

.grade-card.special:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(138,43,226,0.6);
}

.grade-icon {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

:root[data-theme="light"] .grade-card.special {
    background: #799be5; 
    box-shadow: 0 0 15px rgba(70, 164, 195, 0.4);
}

:root[data-theme="light"] .grade-card.special:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(173, 216, 230, 0.6);
}