/* Button Styles */
.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.btn {
    aspect-ratio: 1.5;
    min-height: 58px;
    font-size: 18px;
    font-weight: 600;
    border: none;
    border-radius: 14px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: white;
    position: relative;
    overflow: hidden;
    background: var(--dark-light);
    border: 1.5px solid var(--border);
    box-shadow:
        0 4px 6px rgba(0, 0, 0, 0.3),
        0 1px 3px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.15) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    opacity: 1;
}

.btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow:
        0 12px 24px rgba(0, 0, 0, 0.4),
        0 6px 12px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    border-color: var(--glass-border);
}

.btn:active {
    transform: translateY(0) scale(0.97);
    box-shadow:
        0 2px 4px rgba(0, 0, 0, 0.3),
        inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.btn:active::after {
    width: 100%;
    height: 100%;
    transition: width 0s, height 0s;
}

/* Button Types */
.btn-number {
    background: linear-gradient(135deg, var(--dark-light) 0%, #2D2D4A 100%);
}

.btn-number:hover {
    box-shadow:
        0 12px 24px rgba(79, 70, 229, 0.3),
        0 6px 12px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-operator {
    background: linear-gradient(135deg, var(--warning) 0%, var(--warning-dark) 100%);
    box-shadow:
        0 4px 6px rgba(245, 158, 11, 0.4),
        0 1px 3px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-operator:hover {
    box-shadow:
        0 12px 24px rgba(245, 158, 11, 0.5),
        0 6px 12px rgba(245, 158, 11, 0.3),
        0 0 20px rgba(245, 158, 11, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.btn-function {
    background: linear-gradient(135deg, var(--dark-light) 0%, #323256 100%);
    font-size: 15px;
}

.btn-function:hover {
    box-shadow:
        0 12px 24px rgba(99, 102, 241, 0.3),
        0 6px 12px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-special {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    box-shadow:
        0 4px 6px var(--primary-glow),
        0 1px 3px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-special:hover {
    box-shadow:
        0 12px 24px var(--primary-glow),
        0 6px 12px var(--primary-glow),
        0 0 30px var(--primary-glow),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.btn-clear {
    background: linear-gradient(135deg, var(--danger) 0%, var(--danger-dark) 100%);
    box-shadow:
        0 4px 6px rgba(239, 68, 68, 0.4),
        0 1px 3px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-clear:hover {
    box-shadow:
        0 12px 24px rgba(239, 68, 68, 0.5),
        0 6px 12px rgba(239, 68, 68, 0.3),
        0 0 20px rgba(239, 68, 68, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.btn-equals {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    box-shadow:
        0 4px 6px var(--success-glow),
        0 1px 3px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-equals:hover {
    box-shadow:
        0 12px 24px var(--success-glow),
        0 6px 12px var(--success-glow),
        0 0 30px var(--success-glow),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

/* Scientific Buttons */
.scientific-btns {
    display: none;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    margin-bottom: 8px;
}

.scientific-mode .scientific-btns {
    display: grid;
}